Merge pull request #1485 from bonifaido/mysql-storage

MySQL storage - Take 2

.travis.yml

@@ -2,19 +2,39 @@ language: go
 
 sudo: required
 
+dist: xenial
+
 matrix:
   include:
     - go: '1.12.x'
 
 env:
-  global: DEX_POSTGRES_DATABASE=postgres DEX_POSTGRES_USER=postgres DEX_POSTGRES_HOST="localhost" DEX_ETCD_ENDPOINTS=http://localhost:2379 DEX_LDAP_TESTS=1 DEBIAN_FRONTEND=noninteractive DEX_KEYSTONE_URL=http://localhost:5000 DEX_KEYSTONE_ADMIN_URL=http://localhost:35357 DEX_KEYSTONE_ADMIN_USER=demo DEX_KEYSTONE_ADMIN_PASS=DEMO_PASS
+  global:
+    - DEX_MYSQL_DATABASE=dex
+    - DEX_MYSQL_USER=root
+    - DEX_MYSQL_HOST="localhost"
+    - DEX_MYSQL_PASSWORD=""
+    - DEX_POSTGRES_DATABASE=postgres
+    - DEX_POSTGRES_USER=postgres
+    - DEX_POSTGRES_HOST="localhost"
+    - DEX_ETCD_ENDPOINTS=http://localhost:2379
+    - DEX_LDAP_TESTS=1
+    - DEBIAN_FRONTEND=noninteractive
+    - DEX_KEYSTONE_URL=http://localhost:5000
+    - DEX_KEYSTONE_ADMIN_URL=http://localhost:35357
+    - DEX_KEYSTONE_ADMIN_USER=demo
+    - DEX_KEYSTONE_ADMIN_PASS=DEMO_PASS
 
 go_import_path: github.com/dexidp/dex
 
 services:
+  - mysql
   - postgresql
   - docker
 
+before_install:
+  - mysql -e 'CREATE DATABASE dex;'
+
 install:
   - sudo -E apt-get install -y --force-yes slapd time ldap-utils
   - sudo /etc/init.d/slapd stop

Documentation/storage.md

@@ -298,6 +298,35 @@ storage:
 
 The SSL "mode" corresponds to the `github.com/lib/pq` package [connection options][psql-conn-options]. If unspecified, dex defaults to the strictest mode "verify-full".
 
+### MySQL
+
+Dex requires MySQL 5.7 or later version. When using MySQL, admins may want to dedicate a database to dex for the following reasons:
+
+1. Dex requires privileged access to its database because it performs migrations.
+2. Dex's database table names are not configurable; when shared with other applications there may be table name clashes.
+
+```
+CREATE DATABASE dex_db;
+CREATE USER dex WITH PASSWORD '66964843358242dbaaa7778d8477c288';
+GRANT ALL PRIVILEGES ON DATABASE dex_db TO dex;
+```
+
+An example config for MySQL setup using these values:
+
+```
+storage:
+  type: mysql
+  config:
+    database: dex_db
+    user: dex
+    password: 66964843358242dbaaa7778d8477c288
+    ssl:
+      mode: custom
+      caFile: /etc/dex/mysql.ca
+```
+
+The SSL "mode" corresponds to the `github.com/go-sql-driver/mysql` package [connection options][mysql-conn-options]. If unspecified, dex defaults to the strictest mode "true".
+
 ## Adding a new storage options
 
 Each storage implementation bears a large ongoing maintenance cost and needs to be updated every time a feature requires storing a new type. Bugs often require in depth knowledge of the backing software, and much of this work will be done by developers who are not the original author. Changes to dex which add new storage implementations are not merged lightly.
@@ -320,4 +349,5 @@ Any proposal to add a new implementation must address the following:
 [issues-transaction-tests]: https://github.com/dexidp/dex/issues/600
 [k8s-api]: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/api-conventions.md#concurrency-control-and-consistency
 [psql-conn-options]: https://godoc.org/github.com/lib/pq#hdr-Connection_String_Parameters
+[mysql-conn-options]: https://github.com/go-sql-driver/mysql#tls
 [crd]: https://kubernetes.io/docs/tasks/access-kubernetes-api/extend-api-custom-resource-definitions/

cmd/dex/config.go

@@ -136,6 +136,7 @@ var storages = map[string]func() StorageConfig{
 	"memory":     func() StorageConfig { return new(memory.Config) },
 	"sqlite3":    func() StorageConfig { return new(sql.SQLite3) },
 	"postgres":   func() StorageConfig { return new(sql.Postgres) },
+	"mysql":      func() StorageConfig { return new(sql.MySQL) },
 }
 
 // UnmarshalJSON allows Storage to implement the unmarshaler interface to

cmd/dex/config_test.go

@@ -76,12 +76,14 @@ logger:
 		Storage: Storage{
 			Type: "postgres",
 			Config: &sql.Postgres{
-				Host:              "10.0.0.1",
-				Port:              65432,
-				MaxOpenConns:      5,
-				MaxIdleConns:      3,
-				ConnMaxLifetime:   30,
-				ConnectionTimeout: 3,
+				NetworkDB: sql.NetworkDB{
+					Host:              "10.0.0.1",
+					Port:              65432,
+					MaxOpenConns:      5,
+					MaxIdleConns:      3,
+					ConnMaxLifetime:   30,
+					ConnectionTimeout: 3,
+				},
 			},
 		},
 		Web: Web{

go.mod

@@ -5,6 +5,7 @@ require (
 	github.com/beorn7/perks v0.0.0-20160229213445-3ac7bf7a47d1 // indirect
 	github.com/boltdb/bolt v1.3.1 // indirect
 	github.com/cockroachdb/cmux v0.0.0-20170110192607-30d10be49292 // indirect
+	github.com/coreos/dex v2.13.0+incompatible // indirect
 	github.com/coreos/etcd v3.2.9+incompatible
 	github.com/coreos/go-oidc v2.0.0+incompatible
 	github.com/coreos/go-semver v0.2.0 // indirect
@@ -14,6 +15,7 @@ require (
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible // indirect
 	github.com/felixge/httpsnoop v1.0.0
 	github.com/ghodss/yaml v0.0.0-20161020005002-bea76d6a4713
+	github.com/go-sql-driver/mysql v1.4.1
 	github.com/gogo/protobuf v1.1.1 // indirect
 	github.com/golang/groupcache v0.0.0-20181024230925-c65c006176ff // indirect
 	github.com/golang/protobuf v0.0.0-20171113180720-1e59b77b52bf

go.sum

@@ -6,6 +6,8 @@ github.com/boltdb/bolt v1.3.1 h1:JQmyP4ZBrce+ZQu0dY660FMfatumYDLun9hBCUVIkF4=
 github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
 github.com/cockroachdb/cmux v0.0.0-20170110192607-30d10be49292 h1:dzj1/xcivGjNPwwifh/dWTczkwcuqsXXFHY1X/TZMtw=
 github.com/cockroachdb/cmux v0.0.0-20170110192607-30d10be49292/go.mod h1:qRiX68mZX1lGBkTWyp3CLcenw9I94W2dLeRvMzcn9N4=
+github.com/coreos/dex v2.13.0+incompatible h1:iwTFQFV7PnQ91+vSVhXGWdzEcF4I+U52DgEGDrwGWfk=
+github.com/coreos/dex v2.13.0+incompatible/go.mod h1:eWiVFa+I1sIRiwXi4bJMZvd90+H7EhRm/J1Y6Y18AOM=
 github.com/coreos/etcd v3.2.9+incompatible h1:3TbjfK5+aSRLTU/KgBC1xlgA2dn2ddYQngRqX6HFwlQ=
 github.com/coreos/etcd v3.2.9+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-oidc v2.0.0+incompatible h1:+RStIopZ8wooMx+Vs5Bt8zMXxV1ABl5LbakNExNmZIg=
@@ -24,6 +26,8 @@ github.com/felixge/httpsnoop v1.0.0 h1:gh8fMGz0rlOv/1WmRZm7OgncIOTsAj21iNJot48om
 github.com/felixge/httpsnoop v1.0.0/go.mod h1:3+D9sFq0ahK/JeJPhCBUV1xlf4/eIYrUQaxulT0VzX8=
 github.com/ghodss/yaml v0.0.0-20161020005002-bea76d6a4713 h1:ag3kFMoZZMrEBi4ySTdSWSPz8K7Slu++J9/QXzLBiLk=
 github.com/ghodss/yaml v0.0.0-20161020005002-bea76d6a4713/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/go-sql-driver/mysql v1.4.1 h1:g24URVg0OFbNUTx9qqY1IRZ9D9z3iPyi5zKhQZpNwpA=
+github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
 github.com/gogo/protobuf v1.1.1 h1:72R+M5VuhED/KujmZVcIquuo8mBgX4oVda//DQb3PXo=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/golang/groupcache v0.0.0-20181024230925-c65c006176ff h1:kOkM9whyQYodu09SJ6W3NCsHG7crFaJILQ22Gozp3lg=

storage/sql/config.go

 package sql
 
 import (
+	"crypto/tls"
+	"crypto/x509"
 	"database/sql"
 	"fmt"
+	"io/ioutil"
 	"net"
 	"regexp"
 	"strconv"
 	"strings"
 	"time"
 
+	"github.com/go-sql-driver/mysql"
 	"github.com/lib/pq"
 	sqlite3 "github.com/mattn/go-sqlite3"
 
@@ -21,6 +25,12 @@ const (
 	pgErrUniqueViolation = "23505" // unique_violation
 )
 
+const (
+	// MySQL error codes
+	mysqlErrDupEntry            = 1062
+	mysqlErrDupEntryWithKeyName = 1586
+)
+
 // SQLite3 options for creating an SQL db.
 type SQLite3 struct {
 	// File to
@@ -63,31 +73,29 @@ func (s *SQLite3) open(logger log.Logger) (*conn, error) {
 }
 
 const (
-	sslDisable    = "disable"
-	sslRequire    = "require"
-	sslVerifyCA   = "verify-ca"
-	sslVerifyFull = "verify-full"
+	// postgres SSL modes
+	pgSSLDisable    = "disable"
+	pgSSLRequire    = "require"
+	pgSSLVerifyCA   = "verify-ca"
+	pgSSLVerifyFull = "verify-full"
 )
 
-// PostgresSSL represents SSL options for Postgres databases.
-type PostgresSSL struct {
-	Mode   string
-	CAFile string
-	// Files for client auth.
-	KeyFile  string
-	CertFile string
-}
+const (
+	// MySQL SSL modes
+	mysqlSSLTrue       = "true"
+	mysqlSSLFalse      = "false"
+	mysqlSSLSkipVerify = "skip-verify"
+	mysqlSSLCustom     = "custom"
+)
 
-// Postgres options for creating an SQL db.
-type Postgres struct {
+// NetworkDB contains options common to SQL databases accessed over network.
+type NetworkDB struct {
 	Database string
 	User     string
 	Password string
 	Host     string
 	Port     uint16
 
-	SSL PostgresSSL `json:"ssl" yaml:"ssl"`
-
 	ConnectionTimeout int // Seconds
 
 	// database/sql tunables, see
@@ -98,9 +106,25 @@ type Postgres struct {
 	ConnMaxLifetime int // Seconds, default: not set
 }
 
+// SSL represents SSL options for network databases.
+type SSL struct {
+	Mode   string
+	CAFile string
+	// Files for client auth.
+	KeyFile  string
+	CertFile string
+}
+
+// Postgres options for creating an SQL db.
+type Postgres struct {
+	NetworkDB
+
+	SSL SSL `json:"ssl" yaml:"ssl"`
+}
+
 // Open creates a new storage implementation backed by Postgres.
 func (p *Postgres) Open(logger log.Logger) (storage.Storage, error) {
-	conn, err := p.open(logger, p.createDataSourceName())
+	conn, err := p.open(logger)
 	if err != nil {
 		return nil, err
 	}
@@ -159,7 +183,7 @@ func (p *Postgres) createDataSourceName() string {
 
 	if p.SSL.Mode == "" {
 		// Assume the strictest mode if unspecified.
-		addParam("sslmode", dataSourceStr(sslVerifyFull))
+		addParam("sslmode", dataSourceStr(pgSSLVerifyFull))
 	} else {
 		addParam("sslmode", dataSourceStr(p.SSL.Mode))
 	}
@@ -179,7 +203,9 @@ func (p *Postgres) createDataSourceName() string {
 	return strings.Join(parameters, " ")
 }
 
-func (p *Postgres) open(logger log.Logger, dataSourceName string) (*conn, error) {
+func (p *Postgres) open(logger log.Logger) (*conn, error) {
+	dataSourceName := p.createDataSourceName()
+
 	db, err := sql.Open("postgres", dataSourceName)
 	if err != nil {
 		return nil, err
@@ -216,3 +242,108 @@ func (p *Postgres) open(logger log.Logger, dataSourceName string) (*conn, error)
 	}
 	return c, nil
 }
+
+// MySQL options for creating a MySQL db.
+type MySQL struct {
+	NetworkDB
+
+	SSL SSL `json:"ssl" yaml:"ssl"`
+
+	// TODO(pborzenkov): used by tests to reduce lock wait timeout. Should
+	// we make it exported and allow users to provide arbitrary params?
+	params map[string]string
+}
+
+// Open creates a new storage implementation backed by MySQL.
+func (s *MySQL) Open(logger log.Logger) (storage.Storage, error) {
+	conn, err := s.open(logger)
+	if err != nil {
+		return nil, err
+	}
+	return conn, nil
+}
+
+func (s *MySQL) open(logger log.Logger) (*conn, error) {
+	cfg := mysql.Config{
+		User:                 s.User,
+		Passwd:               s.Password,
+		DBName:               s.Database,
+		AllowNativePasswords: true,
+
+		Timeout: time.Second * time.Duration(s.ConnectionTimeout),
+
+		ParseTime: true,
+		Params: map[string]string{
+			"transaction_isolation": "'SERIALIZABLE'",
+		},
+	}
+	if s.Host != "" {
+		if s.Host[0] != '/' {
+			cfg.Net = "tcp"
+			cfg.Addr = s.Host
+		} else {
+			cfg.Net = "unix"
+			cfg.Addr = s.Host
+		}
+	}
+	if s.SSL.CAFile != "" || s.SSL.CertFile != "" || s.SSL.KeyFile != "" {
+		if err := s.makeTLSConfig(); err != nil {
+			return nil, fmt.Errorf("failed to make TLS config: %v", err)
+		}
+		cfg.TLSConfig = mysqlSSLCustom
+	} else if s.SSL.Mode == "" {
+		cfg.TLSConfig = mysqlSSLTrue
+	} else {
+		cfg.TLSConfig = s.SSL.Mode
+	}
+	for k, v := range s.params {
+		cfg.Params[k] = v
+	}
+
+	db, err := sql.Open("mysql", cfg.FormatDSN())
+	if err != nil {
+		return nil, err
+	}
+
+	errCheck := func(err error) bool {
+		sqlErr, ok := err.(*mysql.MySQLError)
+		if !ok {
+			return false
+		}
+		return sqlErr.Number == mysqlErrDupEntry ||
+			sqlErr.Number == mysqlErrDupEntryWithKeyName
+	}
+
+	c := &conn{db, flavorMySQL, logger, errCheck}
+	if _, err := c.migrate(); err != nil {
+		return nil, fmt.Errorf("failed to perform migrations: %v", err)
+	}
+	return c, nil
+}
+
+func (s *MySQL) makeTLSConfig() error {
+	cfg := &tls.Config{}
+	if s.SSL.CAFile != "" {
+		rootCertPool := x509.NewCertPool()
+		pem, err := ioutil.ReadFile(s.SSL.CAFile)
+		if err != nil {
+			return err
+		}
+		if ok := rootCertPool.AppendCertsFromPEM(pem); !ok {
+			return fmt.Errorf("failed to append PEM")
+		}
+		cfg.RootCAs = rootCertPool
+	}
+	if s.SSL.CertFile != "" && s.SSL.KeyFile != "" {
+		clientCert := make([]tls.Certificate, 0, 1)
+		certs, err := tls.LoadX509KeyPair(s.SSL.CertFile, s.SSL.KeyFile)
+		if err != nil {
+			return err
+		}
+		clientCert = append(clientCert, certs)
+		cfg.Certificates = clientCert
+	}
+
+	mysql.RegisterTLSConfig(mysqlSSLCustom, cfg)
+	return nil
+}

storage/sql/config_test.go

@@ -9,6 +9,7 @@ import (
 
 	"github.com/sirupsen/logrus"
 
+	"github.com/dexidp/dex/pkg/log"
 	"github.com/dexidp/dex/storage"
 	"github.com/dexidp/dex/storage/conformance"
 )
@@ -32,15 +33,16 @@ func withTimeout(t time.Duration, f func()) {
 }
 
 func cleanDB(c *conn) error {
-	_, err := c.Exec(`
-		delete from client;
-		delete from auth_request;
-		delete from auth_code;
-		delete from refresh_token;
-		delete from keys;
-		delete from password;
-	`)
-	return err
+	tables := []string{"client", "auth_request", "auth_code",
+		"refresh_token", "keys", "password"}
+
+	for _, tbl := range tables {
+		_, err := c.Exec("delete from " + tbl)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
 }
 
 var logger = &logrus.Logger{
@@ -49,23 +51,39 @@ var logger = &logrus.Logger{
 	Level:     logrus.DebugLevel,
 }
 
-func TestSQLite3(t *testing.T) {
+type opener interface {
+	open(logger log.Logger) (*conn, error)
+}
+
+func testDB(t *testing.T, o opener, withTransactions bool) {
+	// t.Fatal has a bad habbit of not actually printing the error
+	fatal := func(i interface{}) {
+		fmt.Fprintln(os.Stdout, i)
+		t.Fatal(i)
+	}
+
 	newStorage := func() storage.Storage {
-		// NOTE(ericchiang): In memory means we only get one connection at a time. If we
-		// ever write tests that require using multiple connections, for instance to test
-		// transactions, we need to move to a file based system.
-		s := &SQLite3{":memory:"}
-		conn, err := s.open(logger)
+		conn, err := o.open(logger)
 		if err != nil {
-			fmt.Fprintln(os.Stdout, err)
-			t.Fatal(err)
+			fatal(err)
+		}
+		if err := cleanDB(conn); err != nil {
+			fatal(err)
 		}
 		return conn
 	}
-
-	withTimeout(time.Second*10, func() {
+	withTimeout(time.Minute*1, func() {
 		conformance.RunTests(t, newStorage)
 	})
+	if withTransactions {
+		withTimeout(time.Minute*1, func() {
+			conformance.RunTransactionTests(t, newStorage)
+		})
+	}
+}
+
+func TestSQLite3(t *testing.T) {
+	testDB(t, &SQLite3{":memory:"}, false)
 }
 
 func getenv(key, defaultVal string) string {
@@ -91,19 +109,23 @@ func TestCreateDataSourceName(t *testing.T) {
 		{
 			description: "with typical configuration",
 			input: &Postgres{
-				Host:     "1.2.3.4",
-				Port:     6543,
-				User:     "some-user",
-				Password: "some-password",
-				Database: "some-db",
+				NetworkDB: NetworkDB{
+					Host:     "1.2.3.4",
+					Port:     6543,
+					User:     "some-user",
+					Password: "some-password",
+					Database: "some-db",
+				},
 			},
 			expected: "connect_timeout=0 host='1.2.3.4' port=6543 user='some-user' password='some-password' dbname='some-db' sslmode='verify-full'",
 		},
 		{
 			description: "with unix socket host",
 			input: &Postgres{
-				Host: "/var/run/postgres",
-				SSL: PostgresSSL{
+				NetworkDB: NetworkDB{
+					Host: "/var/run/postgres",
+				},
+				SSL: SSL{
 					Mode: "disable",
 				},
 			},
@@ -112,8 +134,10 @@ func TestCreateDataSourceName(t *testing.T) {
 		{
 			description: "with tcp host",
 			input: &Postgres{
-				Host: "coreos.com",
-				SSL: PostgresSSL{
+				NetworkDB: NetworkDB{
+					Host: "coreos.com",
+				},
+				SSL: SSL{
 					Mode: "disable",
 				},
 			},
@@ -122,23 +146,29 @@ func TestCreateDataSourceName(t *testing.T) {
 		{
 			description: "with tcp host:port",
 			input: &Postgres{
-				Host: "coreos.com:6543",
+				NetworkDB: NetworkDB{
+					Host: "coreos.com:6543",
+				},
 			},
 			expected: "connect_timeout=0 host='coreos.com' port=6543 sslmode='verify-full'",
 		},
 		{
 			description: "with tcp host and port",
 			input: &Postgres{
-				Host: "coreos.com",
-				Port: 6543,
+				NetworkDB: NetworkDB{
+					Host: "coreos.com",
+					Port: 6543,
+				},
 			},
 			expected: "connect_timeout=0 host='coreos.com' port=6543 sslmode='verify-full'",
 		},
 		{
 			description: "with ssl ca cert",
 			input: &Postgres{
-				Host: "coreos.com",
-				SSL: PostgresSSL{
+				NetworkDB: NetworkDB{
+					Host: "coreos.com",
+				},
+				SSL: SSL{
 					Mode:   "verify-ca",
 					CAFile: "/some/file/path",
 				},
@@ -148,8 +178,10 @@ func TestCreateDataSourceName(t *testing.T) {
 		{
 			description: "with ssl client cert",
 			input: &Postgres{
-				Host: "coreos.com",
-				SSL: PostgresSSL{
+				NetworkDB: NetworkDB{
+					Host: "coreos.com",
+				},
+				SSL: SSL{
 					Mode:     "verify-ca",
 					CAFile:   "/some/ca/path",
 					CertFile: "/some/cert/path",
@@ -161,9 +193,11 @@ func TestCreateDataSourceName(t *testing.T) {
 		{
 			description: "with funny characters in credentials",
 			input: &Postgres{
-				Host:     "coreos.com",
-				User:     `some'user\slashed`,
-				Password: "some'password!",
+				NetworkDB: NetworkDB{
+					Host:     "coreos.com",
+					User:     `some'user\slashed`,
+					Password: "some'password!",
+				},
 			},
 			expected: `connect_timeout=0 host='coreos.com' user='some\'user\\slashed' password='some\'password!' sslmode='verify-full'`,
 		},
@@ -186,37 +220,42 @@ func TestPostgres(t *testing.T) {
 	if host == "" {
 		t.Skipf("test environment variable %q not set, skipping", testPostgresEnv)
 	}
-	p := Postgres{
-		Database: getenv("DEX_POSTGRES_DATABASE", "postgres"),
-		User:     getenv("DEX_POSTGRES_USER", "postgres"),
-		Password: getenv("DEX_POSTGRES_PASSWORD", "postgres"),
-		Host:     host,
-		SSL: PostgresSSL{
-			Mode: sslDisable, // Postgres container doesn't support SSL.
+	p := &Postgres{
+		NetworkDB: NetworkDB{
+			Database:          getenv("DEX_POSTGRES_DATABASE", "postgres"),
+			User:              getenv("DEX_POSTGRES_USER", "postgres"),
+			Password:          getenv("DEX_POSTGRES_PASSWORD", "postgres"),
+			Host:              host,
+			ConnectionTimeout: 5,
+		},
+		SSL: SSL{
+			Mode: pgSSLDisable, // Postgres container doesn't support SSL.
 		},
-		ConnectionTimeout: 5,
 	}
+	testDB(t, p, true)
+}
 
-	// t.Fatal has a bad habbit of not actually printing the error
-	fatal := func(i interface{}) {
-		fmt.Fprintln(os.Stdout, i)
-		t.Fatal(i)
-	}
+const testMySQLEnv = "DEX_MYSQL_HOST"
 
-	newStorage := func() storage.Storage {
-		conn, err := p.open(logger, p.createDataSourceName())
-		if err != nil {
-			fatal(err)
-		}
-		if err := cleanDB(conn); err != nil {
-			fatal(err)
-		}
-		return conn
+func TestMySQL(t *testing.T) {
+	host := os.Getenv(testMySQLEnv)
+	if host == "" {
+		t.Skipf("test environment variable %q not set, skipping", testMySQLEnv)
 	}
-	withTimeout(time.Minute*1, func() {
-		conformance.RunTests(t, newStorage)
-	})
-	withTimeout(time.Minute*1, func() {
-		conformance.RunTransactionTests(t, newStorage)
-	})
+	s := &MySQL{
+		NetworkDB: NetworkDB{
+			Database:          getenv("DEX_MYSQL_DATABASE", "mysql"),
+			User:              getenv("DEX_MYSQL_USER", "mysql"),
+			Password:          getenv("DEX_MYSQL_PASSWORD", ""),
+			Host:              host,
+			ConnectionTimeout: 5,
+		},
+		SSL: SSL{
+			Mode: mysqlSSLFalse,
+		},
+		params: map[string]string{
+			"innodb_lock_wait_timeout": "3",
+		},
+	}
+	testDB(t, s, true)
 }

storage/sql/migrate.go

@@ -38,8 +38,10 @@ func (c *conn) migrate() (int, error) {
 
 			migrationNum := n + 1
 			m := migrations[n]
-			if _, err := tx.Exec(m.stmt); err != nil {
-				return fmt.Errorf("migration %d failed: %v", migrationNum, err)
+			for i := range m.stmts {
+				if _, err := tx.Exec(m.stmts[i]); err != nil {
+					return fmt.Errorf("migration %d statement %d failed: %v", migrationNum, i+1, err)
+				}
 			}
 
 			q := `insert into migrations (num, at) values ($1, now());`
@@ -61,14 +63,14 @@ func (c *conn) migrate() (int, error) {
 }
 
 type migration struct {
-	stmt string
+	stmts []string
 	// TODO(ericchiang): consider adding additional fields like "forDrivers"
 }
 
 // All SQL flavors share migration strategies.
 var migrations = []migration{
 	{
-		stmt: `
+		stmts: []string{`
 			create table client (
 				id text not null primary key,
 				secret text not null,
@@ -77,8 +79,8 @@ var migrations = []migration{
 				public boolean not null,
 				name text not null,
 				logo_url text not null
-			);
-		
+			);`,
+			`
 			create table auth_request (
 				id text not null primary key,
 				client_id text not null,
@@ -101,8 +103,8 @@ var migrations = []migration{
 				connector_data bytea,
 		
 				expiry timestamptz not null
-			);
-		
+			);`,
+			`
 			create table auth_code (
 				id text not null primary key,
 				client_id text not null,
@@ -120,8 +122,8 @@ var migrations = []migration{
 				connector_data bytea,
 		
 				expiry timestamptz not null
-			);
-		
+			);`,
+			`
 			create table refresh_token (
 				id text not null primary key,
 				client_id text not null,
@@ -136,15 +138,15 @@ var migrations = []migration{
 		
 				connector_id text not null,
 				connector_data bytea
-			);
-
+			);`,
+			`
 			create table password (
 				email text not null primary key,
 				hash bytea not null,
 				username text not null,
 				user_id text not null
-			);
-		
+			);`,
+			`
 			-- keys is a weird table because we only ever expect there to be a single row
 			create table keys (
 				id text not null primary key,
@@ -152,39 +154,40 @@ var migrations = []migration{
 				signing_key bytea not null,       -- JSON object
 				signing_key_pub bytea not null,   -- JSON object
 				next_rotation timestamptz not null
-			);
-
-		`,
+			);`,
+		},
 	},
 	{
-		stmt: `
+		stmts: []string{`
 			alter table refresh_token
-				add column token text not null default '';
+				add column token text not null default '';`,
+			`
 			alter table refresh_token
-				add column created_at timestamptz not null default '0001-01-01 00:00:00 UTC';
+				add column created_at timestamptz not null default '0001-01-01 00:00:00 UTC';`,
+			`
 			alter table refresh_token
-				add column last_used timestamptz not null default '0001-01-01 00:00:00 UTC';
-		`,
+				add column last_used timestamptz not null default '0001-01-01 00:00:00 UTC';`,
+		},
 	},
 	{
-		stmt: `
+		stmts: []string{`
 			create table offline_session (
 				user_id text not null,
 				conn_id text not null,
 				refresh bytea not null,
 				PRIMARY KEY (user_id, conn_id)
-			);
-		`,
+			);`,
+		},
 	},
 	{
-		stmt: `
+		stmts: []string{`
 			create table connector (
 				id text not null primary key,
 				type text not null,
 				name text not null,
 				resource_version text not null,
 				config bytea
-			);
-		`,
+			);`,
+		},
 	},
 }

storage/sql/postgres_test.go

@@ -13,17 +13,19 @@ func TestPostgresTunables(t *testing.T) {
 		t.Skipf("test environment variable %q not set, skipping", testPostgresEnv)
 	}
 	baseCfg := &Postgres{
-		Database: getenv("DEX_POSTGRES_DATABASE", "postgres"),
-		User:     getenv("DEX_POSTGRES_USER", "postgres"),
-		Password: getenv("DEX_POSTGRES_PASSWORD", "postgres"),
-		Host:     host,
-		SSL: PostgresSSL{
-			Mode: sslDisable, // Postgres container doesn't support SSL.
+		NetworkDB: NetworkDB{
+			Database: getenv("DEX_POSTGRES_DATABASE", "postgres"),
+			User:     getenv("DEX_POSTGRES_USER", "postgres"),
+			Password: getenv("DEX_POSTGRES_PASSWORD", "postgres"),
+			Host:     host,
+		},
+		SSL: SSL{
+			Mode: pgSSLDisable, // Postgres container doesn't support SSL.
 		}}
 
 	t.Run("with nothing set, uses defaults", func(t *testing.T) {
 		cfg := *baseCfg
-		c, err := cfg.open(logger, cfg.createDataSourceName())
+		c, err := cfg.open(logger)
 		if err != nil {
 			t.Fatalf("error opening connector: %s", err.Error())
 		}
@@ -36,7 +38,7 @@ func TestPostgresTunables(t *testing.T) {
 	t.Run("with something set, uses that", func(t *testing.T) {
 		cfg := *baseCfg
 		cfg.MaxOpenConns = 101
-		c, err := cfg.open(logger, cfg.createDataSourceName())
+		c, err := cfg.open(logger)
 		if err != nil {
 			t.Fatalf("error opening connector: %s", err.Error())
 		}

storage/sql/sql.go

@@ -83,6 +83,24 @@ var (
 			{regexp.MustCompile(`\bnow\(\)`), "date('now')"},
 		},
 	}
+
+	flavorMySQL = flavor{
+		queryReplacers: []replacer{
+			{bindRegexp, "?"},
+			// Translate types.
+			{matchLiteral("bytea"), "blob"},
+			{matchLiteral("timestamptz"), "datetime(3)"},
+			// MySQL doesn't support indicies on text fields w/o
+			// specifying key length. Use varchar instead (767 byte
+			// is the max key length for InnoDB with 4k pages).
+			// For compound indexes (with two keys) even less.
+			{matchLiteral("text"), "varchar(384)"},
+			// Quote keywords and reserved words used as identifiers.
+			{regexp.MustCompile(`\b(keys)\b`), "`$1`"},
+			// Change default timestamp to fit datetime.
+			{regexp.MustCompile(`0001-01-01 00:00:00 UTC`), "1000-01-01 00:00:00"},
+		},
+	}
 )
 
 func (f flavor) translate(query string) string {

vendor/github.com/go-sql-driver/mysql/.gitignore

+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+Icon?
+ehthumbs.db
+Thumbs.db
+.idea

vendor/github.com/go-sql-driver/mysql/.travis.yml

+sudo: false
+language: go
+go:
+  - 1.7.x
+  - 1.8.x
+  - 1.9.x
+  - 1.10.x
+  - master
+
+before_install:
+  - go get golang.org/x/tools/cmd/cover
+  - go get github.com/mattn/goveralls
+
+before_script:
+  - echo -e "[server]\ninnodb_log_file_size=256MB\ninnodb_buffer_pool_size=512MB\nmax_allowed_packet=16MB" | sudo tee -a /etc/mysql/my.cnf
+  - sudo service mysql restart
+  - .travis/wait_mysql.sh
+  - mysql -e 'create database gotest;'
+
+matrix:
+  include:
+    - env: DB=MYSQL8
+      sudo: required
+      dist: trusty
+      go: 1.10.x
+      services:
+        - docker
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+        - docker pull mysql:8.0
+        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
+          mysql:8.0 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
+        - cp .travis/docker.cnf ~/.my.cnf
+        - .travis/wait_mysql.sh
+      before_script:
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3307
+        - export MYSQL_TEST_CONCURRENT=1
+
+    - env: DB=MYSQL57
+      sudo: required
+      dist: trusty
+      go: 1.10.x
+      services:
+        - docker
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+        - docker pull mysql:5.7
+        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
+          mysql:5.7 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
+        - cp .travis/docker.cnf ~/.my.cnf
+        - .travis/wait_mysql.sh
+      before_script:
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3307
+        - export MYSQL_TEST_CONCURRENT=1
+
+    - env: DB=MARIA55
+      sudo: required
+      dist: trusty
+      go: 1.10.x
+      services:
+        - docker
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+        - docker pull mariadb:5.5
+        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
+          mariadb:5.5 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
+        - cp .travis/docker.cnf ~/.my.cnf
+        - .travis/wait_mysql.sh
+      before_script:
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3307
+        - export MYSQL_TEST_CONCURRENT=1
+
+    - env: DB=MARIA10_1
+      sudo: required
+      dist: trusty
+      go: 1.10.x
+      services:
+        - docker
+      before_install:
+        - go get golang.org/x/tools/cmd/cover
+        - go get github.com/mattn/goveralls
+        - docker pull mariadb:10.1
+        - docker run -d -p 127.0.0.1:3307:3306 --name mysqld -e MYSQL_DATABASE=gotest -e MYSQL_USER=gotest -e MYSQL_PASSWORD=secret -e MYSQL_ROOT_PASSWORD=verysecret
+          mariadb:10.1 --innodb_log_file_size=256MB --innodb_buffer_pool_size=512MB --max_allowed_packet=16MB --local-infile=1
+        - cp .travis/docker.cnf ~/.my.cnf
+        - .travis/wait_mysql.sh
+      before_script:
+        - export MYSQL_TEST_USER=gotest
+        - export MYSQL_TEST_PASS=secret
+        - export MYSQL_TEST_ADDR=127.0.0.1:3307
+        - export MYSQL_TEST_CONCURRENT=1
+
+script:
+  - go test -v -covermode=count -coverprofile=coverage.out
+  - go vet ./...
+  - .travis/gofmt.sh
+after_script:
+  - $HOME/gopath/bin/goveralls -coverprofile=coverage.out -service=travis-ci

vendor/github.com/go-sql-driver/mysql/AUTHORS

+# This is the official list of Go-MySQL-Driver authors for copyright purposes.
+
+# If you are submitting a patch, please add your name or the name of the
+# organization which holds the copyright to this list in alphabetical order.
+
+# Names should be added to this file as
+#	Name <email address>
+# The email address is not required for organizations.
+# Please keep the list sorted.
+
+
+# Individual Persons
+
+Aaron Hopkins <go-sql-driver at die.net>
+Achille Roussel <achille.roussel at gmail.com>
+Alexey Palazhchenko <alexey.palazhchenko at gmail.com>
+Andrew Reid <andrew.reid at tixtrack.com>
+Arne Hormann <arnehormann at gmail.com>
+Asta Xie <xiemengjun at gmail.com>
+Bulat Gaifullin <gaifullinbf at gmail.com>
+Carlos Nieto <jose.carlos at menteslibres.net>
+Chris Moos <chris at tech9computers.com>
+Craig Wilson <craiggwilson at gmail.com>
+Daniel Montoya <dsmontoyam at gmail.com>
+Daniel Nichter <nil at codenode.com>
+Daniël van Eeden <git at myname.nl>
+Dave Protasowski <dprotaso at gmail.com>
+DisposaBoy <disposaboy at dby.me>
+Egor Smolyakov <egorsmkv at gmail.com>
+Evan Shaw <evan at vendhq.com>
+Frederick Mayle <frederickmayle at gmail.com>
+Gustavo Kristic <gkristic at gmail.com>
+Hajime Nakagami <nakagami at gmail.com>
+Hanno Braun <mail at hannobraun.com>
+Henri Yandell <flamefew at gmail.com>
+Hirotaka Yamamoto <ymmt2005 at gmail.com>
+ICHINOSE Shogo <shogo82148 at gmail.com>
+INADA Naoki <songofacandy at gmail.com>
+Jacek Szwec <szwec.jacek at gmail.com>
+James Harr <james.harr at gmail.com>
+Jeff Hodges <jeff at somethingsimilar.com>
+Jeffrey Charles <jeffreycharles at gmail.com>
+Jian Zhen <zhenjl at gmail.com>
+Joshua Prunier <joshua.prunier at gmail.com>
+Julien Lefevre <julien.lefevr at gmail.com>
+Julien Schmidt <go-sql-driver at julienschmidt.com>
+Justin Li <jli at j-li.net>
+Justin Nuß <nuss.justin at gmail.com>
+Kamil Dziedzic <kamil at klecza.pl>
+Kevin Malachowski <kevin at chowski.com>
+Kieron Woodhouse <kieron.woodhouse at infosum.com>
+Lennart Rudolph <lrudolph at hmc.edu>
+Leonardo YongUk Kim <dalinaum at gmail.com>
+Linh Tran Tuan <linhduonggnu at gmail.com>
+Lion Yang <lion at aosc.xyz>
+Luca Looz <luca.looz92 at gmail.com>
+Lucas Liu <extrafliu at gmail.com>
+Luke Scott <luke at webconnex.com>
+Maciej Zimnoch <maciej.zimnoch at codilime.com>
+Michael Woolnough <michael.woolnough at gmail.com>
+Nicola Peduzzi <thenikso at gmail.com>
+Olivier Mengué <dolmen at cpan.org>
+oscarzhao <oscarzhaosl at gmail.com>
+Paul Bonser <misterpib at gmail.com>
+Peter Schultz <peter.schultz at classmarkets.com>
+Rebecca Chin <rchin at pivotal.io>
+Reed Allman <rdallman10 at gmail.com>
+Richard Wilkes <wilkes at me.com>
+Robert Russell <robert at rrbrussell.com>
+Runrioter Wung <runrioter at gmail.com>
+Shuode Li <elemount at qq.com>
+Soroush Pour <me at soroushjp.com>
+Stan Putrya <root.vagner at gmail.com>
+Stanley Gunawan <gunawan.stanley at gmail.com>
+Xiangyu Hu <xiangyu.hu at outlook.com>
+Xiaobing Jiang <s7v7nislands at gmail.com>
+Xiuming Chen <cc at cxm.cc>
+Zhenye Xie <xiezhenye at gmail.com>
+
+# Organizations
+
+Barracuda Networks, Inc.
+Counting Ltd.
+Google Inc.
+InfoSum Ltd.
+Keybase Inc.
+Percona LLC
+Pivotal Inc.
+Stripe Inc.

vendor/github.com/go-sql-driver/mysql/CHANGELOG.md

+## Version 1.4.1 (2018-11-14)
+
+Bugfixes:
+
+ - Fix TIME format for binary columns (#818)
+ - Fix handling of empty auth plugin names (#835)
+ - Fix caching_sha2_password with empty password (#826)
+ - Fix canceled context broke mysqlConn (#862)
+ - Fix OldAuthSwitchRequest support (#870)
+ - Fix Auth Response packet for cleartext password (#887)
+
+## Version 1.4 (2018-06-03)
+
+Changes:
+
+ - Documentation fixes (#530, #535, #567)
+ - Refactoring (#575, #579, #580, #581, #603, #615, #704)
+ - Cache column names (#444)
+ - Sort the DSN parameters in DSNs generated from a config (#637)
+ - Allow native password authentication by default (#644)
+ - Use the default port if it is missing in the DSN (#668)
+ - Removed the `strict` mode (#676)
+ - Do not query `max_allowed_packet` by default (#680)
+ - Dropped support Go 1.6 and lower (#696)
+ - Updated `ConvertValue()` to match the database/sql/driver implementation (#760)
+ - Document the usage of `0000-00-00T00:00:00` as the time.Time zero value (#783)
+ - Improved the compatibility of the authentication system (#807)
+
+New Features:
+
+ - Multi-Results support (#537)
+ - `rejectReadOnly` DSN option (#604)
+ - `context.Context` support (#608, #612, #627, #761)
+ - Transaction isolation level support (#619, #744)
+ - Read-Only transactions support (#618, #634)
+ - `NewConfig` function which initializes a config with default values (#679)
+ - Implemented the `ColumnType` interfaces (#667, #724)
+ - Support for custom string types in `ConvertValue` (#623)
+ - Implemented `NamedValueChecker`, improving support for uint64 with high bit set (#690, #709, #710)
+ - `caching_sha2_password` authentication plugin support (#794, #800, #801, #802)
+ - Implemented `driver.SessionResetter` (#779)
+ - `sha256_password` authentication plugin support (#808)
+
+Bugfixes:
+
+ - Use the DSN hostname as TLS default ServerName if `tls=true` (#564, #718)
+ - Fixed LOAD LOCAL DATA INFILE for empty files (#590)
+ - Removed columns definition cache since it sometimes cached invalid data (#592)
+ - Don't mutate registered TLS configs (#600)
+ - Make RegisterTLSConfig concurrency-safe (#613)
+ - Handle missing auth data in the handshake packet correctly (#646)
+ - Do not retry queries when data was written to avoid data corruption (#302, #736)
+ - Cache the connection pointer for error handling before invalidating it (#678)
+ - Fixed imports for appengine/cloudsql (#700)
+ - Fix sending STMT_LONG_DATA for 0 byte data (#734)
+ - Set correct capacity for []bytes read from length-encoded strings (#766)
+ - Make RegisterDial concurrency-safe (#773)
+
+
+## Version 1.3 (2016-12-01)
+
+Changes:
+
+ - Go 1.1 is no longer supported
+ - Use decimals fields in MySQL to format time types (#249)
+ - Buffer optimizations (#269)
+ - TLS ServerName defaults to the host (#283)
+ - Refactoring (#400, #410, #437)
+ - Adjusted documentation for second generation CloudSQL (#485)
+ - Documented DSN system var quoting rules (#502)
+ - Made statement.Close() calls idempotent to avoid errors in Go 1.6+ (#512)
+
+New Features:
+
+ - Enable microsecond resolution on TIME, DATETIME and TIMESTAMP (#249)
+ - Support for returning table alias on Columns() (#289, #359, #382)
+ - Placeholder interpolation, can be actived with the DSN parameter `interpolateParams=true` (#309, #318, #490)
+ - Support for uint64 parameters with high bit set (#332, #345)
+ - Cleartext authentication plugin support (#327)
+ - Exported ParseDSN function and the Config struct (#403, #419, #429)
+ - Read / Write timeouts (#401)
+ - Support for JSON field type (#414)
+ - Support for multi-statements and multi-results (#411, #431)
+ - DSN parameter to set the driver-side max_allowed_packet value manually (#489)
+ - Native password authentication plugin support (#494, #524)
+
+Bugfixes:
+
+ - Fixed handling of queries without columns and rows (#255)
+ - Fixed a panic when SetKeepAlive() failed (#298)
+ - Handle ERR packets while reading rows (#321)
+ - Fixed reading NULL length-encoded integers in MySQL 5.6+ (#349)
+ - Fixed absolute paths support in LOAD LOCAL DATA INFILE (#356)
+ - Actually zero out bytes in handshake response (#378)
+ - Fixed race condition in registering LOAD DATA INFILE handler (#383)
+ - Fixed tests with MySQL 5.7.9+ (#380)
+ - QueryUnescape TLS config names (#397)
+ - Fixed "broken pipe" error by writing to closed socket (#390)
+ - Fixed LOAD LOCAL DATA INFILE buffering (#424)
+ - Fixed parsing of floats into float64 when placeholders are used (#434)
+ - Fixed DSN tests with Go 1.7+ (#459)
+ - Handle ERR packets while waiting for EOF (#473)
+ - Invalidate connection on error while discarding additional results (#513)
+ - Allow terminating packets of length 0 (#516)
+
+
+## Version 1.2 (2014-06-03)
+
+Changes:
+
+ - We switched back to a "rolling release". `go get` installs the current master branch again
+ - Version v1 of the driver will not be maintained anymore. Go 1.0 is no longer supported by this driver
+ - Exported errors to allow easy checking from application code
+ - Enabled TCP Keepalives on TCP connections
+ - Optimized INFILE handling (better buffer size calculation, lazy init, ...)
+ - The DSN parser also checks for a missing separating slash
+ - Faster binary date / datetime to string formatting
+ - Also exported the MySQLWarning type
+ - mysqlConn.Close returns the first error encountered instead of ignoring all errors
+ - writePacket() automatically writes the packet size to the header
+ - readPacket() uses an iterative approach instead of the recursive approach to merge splitted packets
+
+New Features:
+
+ - `RegisterDial` allows the usage of a custom dial function to establish the network connection
+ - Setting the connection collation is possible with the `collation` DSN parameter. This parameter should be preferred over the `charset` parameter
+ - Logging of critical errors is configurable with `SetLogger`
+ - Google CloudSQL support
+
+Bugfixes:
+
+ - Allow more than 32 parameters in prepared statements
+ - Various old_password fixes
+ - Fixed TestConcurrent test to pass Go's race detection
+ - Fixed appendLengthEncodedInteger for large numbers
+ - Renamed readLengthEnodedString to readLengthEncodedString and skipLengthEnodedString to skipLengthEncodedString (fixed typo)
+
+
+## Version 1.1 (2013-11-02)
+
+Changes:
+
+  - Go-MySQL-Driver now requires Go 1.1
+  - Connections now use the collation `utf8_general_ci` by default. Adding `&charset=UTF8` to the DSN should not be necessary anymore
+  - Made closing rows and connections error tolerant. This allows for example deferring rows.Close() without checking for errors
+  - `[]byte(nil)` is now treated as a NULL value. Before, it was treated like an empty string / `[]byte("")`
+  - DSN parameter values must now be url.QueryEscape'ed. This allows text values to contain special characters, such as '&'.
+  - Use the IO buffer also for writing. This results in zero allocations (by the driver) for most queries
+  - Optimized the buffer for reading
+  - stmt.Query now caches column metadata
+  - New Logo
+  - Changed the copyright header to include all contributors
+  - Improved the LOAD INFILE documentation
+  - The driver struct is now exported to make the driver directly accessible
+  - Refactored the driver tests
+  - Added more benchmarks and moved all to a separate file
+  - Other small refactoring
+
+New Features:
+
+  - Added *old_passwords* support: Required in some cases, but must be enabled by adding `allowOldPasswords=true` to the DSN since it is insecure
+  - Added a `clientFoundRows` parameter: Return the number of matching rows instead of the number of rows changed on UPDATEs
+  - Added TLS/SSL support: Use a TLS/SSL encrypted connection to the server. Custom TLS configs can be registered and used
+
+Bugfixes:
+
+  - Fixed MySQL 4.1 support: MySQL 4.1 sends packets with lengths which differ from the specification
+  - Convert to DB timezone when inserting `time.Time`
+  - Splitted packets (more than 16MB) are now merged correctly
+  - Fixed false positive `io.EOF` errors when the data was fully read
+  - Avoid panics on reuse of closed connections
+  - Fixed empty string producing false nil values
+  - Fixed sign byte for positive TIME fields
+
+
+## Version 1.0 (2013-05-14)
+
+Initial Release

vendor/github.com/go-sql-driver/mysql/CONTRIBUTING.md

+# Contributing Guidelines
+
+## Reporting Issues
+
+Before creating a new Issue, please check first if a similar Issue [already exists](https://github.com/go-sql-driver/mysql/issues?state=open) or was [recently closed](https://github.com/go-sql-driver/mysql/issues?direction=desc&page=1&sort=updated&state=closed).
+
+## Contributing Code
+
+By contributing to this project, you share your code under the Mozilla Public License 2, as specified in the LICENSE file.
+Don't forget to add yourself to the AUTHORS file.
+
+### Code Review
+
+Everyone is invited to review and comment on pull requests.
+If it looks fine to you, comment with "LGTM" (Looks good to me).
+
+If changes are required, notice the reviewers with "PTAL" (Please take another look) after committing the fixes.
+
+Before merging the Pull Request, at least one [team member](https://github.com/go-sql-driver?tab=members) must have commented with "LGTM".
+
+## Development Ideas
+
+If you are looking for ideas for code contributions, please check our [Development Ideas](https://github.com/go-sql-driver/mysql/wiki/Development-Ideas) Wiki page.

vendor/github.com/go-sql-driver/mysql/appengine.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// +build appengine
+
+package mysql
+
+import (
+	"google.golang.org/appengine/cloudsql"
+)
+
+func init() {
+	RegisterDial("cloudsql", cloudsql.Dial)
+}

vendor/github.com/go-sql-driver/mysql/buffer.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"io"
+	"net"
+	"time"
+)
+
+const defaultBufSize = 4096
+
+// A buffer which is used for both reading and writing.
+// This is possible since communication on each connection is synchronous.
+// In other words, we can't write and read simultaneously on the same connection.
+// The buffer is similar to bufio.Reader / Writer but zero-copy-ish
+// Also highly optimized for this particular use case.
+type buffer struct {
+	buf     []byte
+	nc      net.Conn
+	idx     int
+	length  int
+	timeout time.Duration
+}
+
+func newBuffer(nc net.Conn) buffer {
+	var b [defaultBufSize]byte
+	return buffer{
+		buf: b[:],
+		nc:  nc,
+	}
+}
+
+// fill reads into the buffer until at least _need_ bytes are in it
+func (b *buffer) fill(need int) error {
+	n := b.length
+
+	// move existing data to the beginning
+	if n > 0 && b.idx > 0 {
+		copy(b.buf[0:n], b.buf[b.idx:])
+	}
+
+	// grow buffer if necessary
+	// TODO: let the buffer shrink again at some point
+	//       Maybe keep the org buf slice and swap back?
+	if need > len(b.buf) {
+		// Round up to the next multiple of the default size
+		newBuf := make([]byte, ((need/defaultBufSize)+1)*defaultBufSize)
+		copy(newBuf, b.buf)
+		b.buf = newBuf
+	}
+
+	b.idx = 0
+
+	for {
+		if b.timeout > 0 {
+			if err := b.nc.SetReadDeadline(time.Now().Add(b.timeout)); err != nil {
+				return err
+			}
+		}
+
+		nn, err := b.nc.Read(b.buf[n:])
+		n += nn
+
+		switch err {
+		case nil:
+			if n < need {
+				continue
+			}
+			b.length = n
+			return nil
+
+		case io.EOF:
+			if n >= need {
+				b.length = n
+				return nil
+			}
+			return io.ErrUnexpectedEOF
+
+		default:
+			return err
+		}
+	}
+}
+
+// returns next N bytes from buffer.
+// The returned slice is only guaranteed to be valid until the next read
+func (b *buffer) readNext(need int) ([]byte, error) {
+	if b.length < need {
+		// refill
+		if err := b.fill(need); err != nil {
+			return nil, err
+		}
+	}
+
+	offset := b.idx
+	b.idx += need
+	b.length -= need
+	return b.buf[offset:b.idx], nil
+}
+
+// returns a buffer with the requested size.
+// If possible, a slice from the existing buffer is returned.
+// Otherwise a bigger buffer is made.
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeBuffer(length int) []byte {
+	if b.length > 0 {
+		return nil
+	}
+
+	// test (cheap) general case first
+	if length <= defaultBufSize || length <= cap(b.buf) {
+		return b.buf[:length]
+	}
+
+	if length < maxPacketSize {
+		b.buf = make([]byte, length)
+		return b.buf
+	}
+	return make([]byte, length)
+}
+
+// shortcut which can be used if the requested buffer is guaranteed to be
+// smaller than defaultBufSize
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeSmallBuffer(length int) []byte {
+	if b.length > 0 {
+		return nil
+	}
+	return b.buf[:length]
+}
+
+// takeCompleteBuffer returns the complete existing buffer.
+// This can be used if the necessary buffer size is unknown.
+// Only one buffer (total) can be used at a time.
+func (b *buffer) takeCompleteBuffer() []byte {
+	if b.length > 0 {
+		return nil
+	}
+	return b.buf
+}

vendor/github.com/go-sql-driver/mysql/collations.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2014 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+const defaultCollation = "utf8_general_ci"
+const binaryCollation = "binary"
+
+// A list of available collations mapped to the internal ID.
+// To update this map use the following MySQL query:
+//     SELECT COLLATION_NAME, ID FROM information_schema.COLLATIONS
+var collations = map[string]byte{
+	"big5_chinese_ci":          1,
+	"latin2_czech_cs":          2,
+	"dec8_swedish_ci":          3,
+	"cp850_general_ci":         4,
+	"latin1_german1_ci":        5,
+	"hp8_english_ci":           6,
+	"koi8r_general_ci":         7,
+	"latin1_swedish_ci":        8,
+	"latin2_general_ci":        9,
+	"swe7_swedish_ci":          10,
+	"ascii_general_ci":         11,
+	"ujis_japanese_ci":         12,
+	"sjis_japanese_ci":         13,
+	"cp1251_bulgarian_ci":      14,
+	"latin1_danish_ci":         15,
+	"hebrew_general_ci":        16,
+	"tis620_thai_ci":           18,
+	"euckr_korean_ci":          19,
+	"latin7_estonian_cs":       20,
+	"latin2_hungarian_ci":      21,
+	"koi8u_general_ci":         22,
+	"cp1251_ukrainian_ci":      23,
+	"gb2312_chinese_ci":        24,
+	"greek_general_ci":         25,
+	"cp1250_general_ci":        26,
+	"latin2_croatian_ci":       27,
+	"gbk_chinese_ci":           28,
+	"cp1257_lithuanian_ci":     29,
+	"latin5_turkish_ci":        30,
+	"latin1_german2_ci":        31,
+	"armscii8_general_ci":      32,
+	"utf8_general_ci":          33,
+	"cp1250_czech_cs":          34,
+	"ucs2_general_ci":          35,
+	"cp866_general_ci":         36,
+	"keybcs2_general_ci":       37,
+	"macce_general_ci":         38,
+	"macroman_general_ci":      39,
+	"cp852_general_ci":         40,
+	"latin7_general_ci":        41,
+	"latin7_general_cs":        42,
+	"macce_bin":                43,
+	"cp1250_croatian_ci":       44,
+	"utf8mb4_general_ci":       45,
+	"utf8mb4_bin":              46,
+	"latin1_bin":               47,
+	"latin1_general_ci":        48,
+	"latin1_general_cs":        49,
+	"cp1251_bin":               50,
+	"cp1251_general_ci":        51,
+	"cp1251_general_cs":        52,
+	"macroman_bin":             53,
+	"utf16_general_ci":         54,
+	"utf16_bin":                55,
+	"utf16le_general_ci":       56,
+	"cp1256_general_ci":        57,
+	"cp1257_bin":               58,
+	"cp1257_general_ci":        59,
+	"utf32_general_ci":         60,
+	"utf32_bin":                61,
+	"utf16le_bin":              62,
+	"binary":                   63,
+	"armscii8_bin":             64,
+	"ascii_bin":                65,
+	"cp1250_bin":               66,
+	"cp1256_bin":               67,
+	"cp866_bin":                68,
+	"dec8_bin":                 69,
+	"greek_bin":                70,
+	"hebrew_bin":               71,
+	"hp8_bin":                  72,
+	"keybcs2_bin":              73,
+	"koi8r_bin":                74,
+	"koi8u_bin":                75,
+	"latin2_bin":               77,
+	"latin5_bin":               78,
+	"latin7_bin":               79,
+	"cp850_bin":                80,
+	"cp852_bin":                81,
+	"swe7_bin":                 82,
+	"utf8_bin":                 83,
+	"big5_bin":                 84,
+	"euckr_bin":                85,
+	"gb2312_bin":               86,
+	"gbk_bin":                  87,
+	"sjis_bin":                 88,
+	"tis620_bin":               89,
+	"ucs2_bin":                 90,
+	"ujis_bin":                 91,
+	"geostd8_general_ci":       92,
+	"geostd8_bin":              93,
+	"latin1_spanish_ci":        94,
+	"cp932_japanese_ci":        95,
+	"cp932_bin":                96,
+	"eucjpms_japanese_ci":      97,
+	"eucjpms_bin":              98,
+	"cp1250_polish_ci":         99,
+	"utf16_unicode_ci":         101,
+	"utf16_icelandic_ci":       102,
+	"utf16_latvian_ci":         103,
+	"utf16_romanian_ci":        104,
+	"utf16_slovenian_ci":       105,
+	"utf16_polish_ci":          106,
+	"utf16_estonian_ci":        107,
+	"utf16_spanish_ci":         108,
+	"utf16_swedish_ci":         109,
+	"utf16_turkish_ci":         110,
+	"utf16_czech_ci":           111,
+	"utf16_danish_ci":          112,
+	"utf16_lithuanian_ci":      113,
+	"utf16_slovak_ci":          114,
+	"utf16_spanish2_ci":        115,
+	"utf16_roman_ci":           116,
+	"utf16_persian_ci":         117,
+	"utf16_esperanto_ci":       118,
+	"utf16_hungarian_ci":       119,
+	"utf16_sinhala_ci":         120,
+	"utf16_german2_ci":         121,
+	"utf16_croatian_ci":        122,
+	"utf16_unicode_520_ci":     123,
+	"utf16_vietnamese_ci":      124,
+	"ucs2_unicode_ci":          128,
+	"ucs2_icelandic_ci":        129,
+	"ucs2_latvian_ci":          130,
+	"ucs2_romanian_ci":         131,
+	"ucs2_slovenian_ci":        132,
+	"ucs2_polish_ci":           133,
+	"ucs2_estonian_ci":         134,
+	"ucs2_spanish_ci":          135,
+	"ucs2_swedish_ci":          136,
+	"ucs2_turkish_ci":          137,
+	"ucs2_czech_ci":            138,
+	"ucs2_danish_ci":           139,
+	"ucs2_lithuanian_ci":       140,
+	"ucs2_slovak_ci":           141,
+	"ucs2_spanish2_ci":         142,
+	"ucs2_roman_ci":            143,
+	"ucs2_persian_ci":          144,
+	"ucs2_esperanto_ci":        145,
+	"ucs2_hungarian_ci":        146,
+	"ucs2_sinhala_ci":          147,
+	"ucs2_german2_ci":          148,
+	"ucs2_croatian_ci":         149,
+	"ucs2_unicode_520_ci":      150,
+	"ucs2_vietnamese_ci":       151,
+	"ucs2_general_mysql500_ci": 159,
+	"utf32_unicode_ci":         160,
+	"utf32_icelandic_ci":       161,
+	"utf32_latvian_ci":         162,
+	"utf32_romanian_ci":        163,
+	"utf32_slovenian_ci":       164,
+	"utf32_polish_ci":          165,
+	"utf32_estonian_ci":        166,
+	"utf32_spanish_ci":         167,
+	"utf32_swedish_ci":         168,
+	"utf32_turkish_ci":         169,
+	"utf32_czech_ci":           170,
+	"utf32_danish_ci":          171,
+	"utf32_lithuanian_ci":      172,
+	"utf32_slovak_ci":          173,
+	"utf32_spanish2_ci":        174,
+	"utf32_roman_ci":           175,
+	"utf32_persian_ci":         176,
+	"utf32_esperanto_ci":       177,
+	"utf32_hungarian_ci":       178,
+	"utf32_sinhala_ci":         179,
+	"utf32_german2_ci":         180,
+	"utf32_croatian_ci":        181,
+	"utf32_unicode_520_ci":     182,
+	"utf32_vietnamese_ci":      183,
+	"utf8_unicode_ci":          192,
+	"utf8_icelandic_ci":        193,
+	"utf8_latvian_ci":          194,
+	"utf8_romanian_ci":         195,
+	"utf8_slovenian_ci":        196,
+	"utf8_polish_ci":           197,
+	"utf8_estonian_ci":         198,
+	"utf8_spanish_ci":          199,
+	"utf8_swedish_ci":          200,
+	"utf8_turkish_ci":          201,
+	"utf8_czech_ci":            202,
+	"utf8_danish_ci":           203,
+	"utf8_lithuanian_ci":       204,
+	"utf8_slovak_ci":           205,
+	"utf8_spanish2_ci":         206,
+	"utf8_roman_ci":            207,
+	"utf8_persian_ci":          208,
+	"utf8_esperanto_ci":        209,
+	"utf8_hungarian_ci":        210,
+	"utf8_sinhala_ci":          211,
+	"utf8_german2_ci":          212,
+	"utf8_croatian_ci":         213,
+	"utf8_unicode_520_ci":      214,
+	"utf8_vietnamese_ci":       215,
+	"utf8_general_mysql500_ci": 223,
+	"utf8mb4_unicode_ci":       224,
+	"utf8mb4_icelandic_ci":     225,
+	"utf8mb4_latvian_ci":       226,
+	"utf8mb4_romanian_ci":      227,
+	"utf8mb4_slovenian_ci":     228,
+	"utf8mb4_polish_ci":        229,
+	"utf8mb4_estonian_ci":      230,
+	"utf8mb4_spanish_ci":       231,
+	"utf8mb4_swedish_ci":       232,
+	"utf8mb4_turkish_ci":       233,
+	"utf8mb4_czech_ci":         234,
+	"utf8mb4_danish_ci":        235,
+	"utf8mb4_lithuanian_ci":    236,
+	"utf8mb4_slovak_ci":        237,
+	"utf8mb4_spanish2_ci":      238,
+	"utf8mb4_roman_ci":         239,
+	"utf8mb4_persian_ci":       240,
+	"utf8mb4_esperanto_ci":     241,
+	"utf8mb4_hungarian_ci":     242,
+	"utf8mb4_sinhala_ci":       243,
+	"utf8mb4_german2_ci":       244,
+	"utf8mb4_croatian_ci":      245,
+	"utf8mb4_unicode_520_ci":   246,
+	"utf8mb4_vietnamese_ci":    247,
+}
+
+// A blacklist of collations which is unsafe to interpolate parameters.
+// These multibyte encodings may contains 0x5c (`\`) in their trailing bytes.
+var unsafeCollations = map[string]bool{
+	"big5_chinese_ci":   true,
+	"sjis_japanese_ci":  true,
+	"gbk_chinese_ci":    true,
+	"big5_bin":          true,
+	"gb2312_bin":        true,
+	"gbk_bin":           true,
+	"sjis_bin":          true,
+	"cp932_japanese_ci": true,
+	"cp932_bin":         true,
+}

vendor/github.com/go-sql-driver/mysql/connection_go18.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// +build go1.8
+
+package mysql
+
+import (
+	"context"
+	"database/sql"
+	"database/sql/driver"
+)
+
+// Ping implements driver.Pinger interface
+func (mc *mysqlConn) Ping(ctx context.Context) (err error) {
+	if mc.closed.IsSet() {
+		errLog.Print(ErrInvalidConn)
+		return driver.ErrBadConn
+	}
+
+	if err = mc.watchCancel(ctx); err != nil {
+		return
+	}
+	defer mc.finish()
+
+	if err = mc.writeCommandPacket(comPing); err != nil {
+		return
+	}
+
+	return mc.readResultOK()
+}
+
+// BeginTx implements driver.ConnBeginTx interface
+func (mc *mysqlConn) BeginTx(ctx context.Context, opts driver.TxOptions) (driver.Tx, error) {
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer mc.finish()
+
+	if sql.IsolationLevel(opts.Isolation) != sql.LevelDefault {
+		level, err := mapIsolationLevel(opts.Isolation)
+		if err != nil {
+			return nil, err
+		}
+		err = mc.exec("SET TRANSACTION ISOLATION LEVEL " + level)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	return mc.begin(opts.ReadOnly)
+}
+
+func (mc *mysqlConn) QueryContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Rows, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	rows, err := mc.query(query, dargs)
+	if err != nil {
+		mc.finish()
+		return nil, err
+	}
+	rows.finish = mc.finish
+	return rows, err
+}
+
+func (mc *mysqlConn) ExecContext(ctx context.Context, query string, args []driver.NamedValue) (driver.Result, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer mc.finish()
+
+	return mc.Exec(query, dargs)
+}
+
+func (mc *mysqlConn) PrepareContext(ctx context.Context, query string) (driver.Stmt, error) {
+	if err := mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	stmt, err := mc.Prepare(query)
+	mc.finish()
+	if err != nil {
+		return nil, err
+	}
+
+	select {
+	default:
+	case <-ctx.Done():
+		stmt.Close()
+		return nil, ctx.Err()
+	}
+	return stmt, nil
+}
+
+func (stmt *mysqlStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := stmt.mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+
+	rows, err := stmt.query(dargs)
+	if err != nil {
+		stmt.mc.finish()
+		return nil, err
+	}
+	rows.finish = stmt.mc.finish
+	return rows, err
+}
+
+func (stmt *mysqlStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
+	dargs, err := namedValueToValue(args)
+	if err != nil {
+		return nil, err
+	}
+
+	if err := stmt.mc.watchCancel(ctx); err != nil {
+		return nil, err
+	}
+	defer stmt.mc.finish()
+
+	return stmt.Exec(dargs)
+}
+
+func (mc *mysqlConn) watchCancel(ctx context.Context) error {
+	if mc.watching {
+		// Reach here if canceled,
+		// so the connection is already invalid
+		mc.cleanup()
+		return nil
+	}
+	// When ctx is already cancelled, don't watch it.
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	// When ctx is not cancellable, don't watch it.
+	if ctx.Done() == nil {
+		return nil
+	}
+	// When watcher is not alive, can't watch it.
+	if mc.watcher == nil {
+		return nil
+	}
+
+	mc.watching = true
+	mc.watcher <- ctx
+	return nil
+}
+
+func (mc *mysqlConn) startWatcher() {
+	watcher := make(chan mysqlContext, 1)
+	mc.watcher = watcher
+	finished := make(chan struct{})
+	mc.finished = finished
+	go func() {
+		for {
+			var ctx mysqlContext
+			select {
+			case ctx = <-watcher:
+			case <-mc.closech:
+				return
+			}
+
+			select {
+			case <-ctx.Done():
+				mc.cancel(ctx.Err())
+			case <-finished:
+			case <-mc.closech:
+				return
+			}
+		}
+	}()
+}
+
+func (mc *mysqlConn) CheckNamedValue(nv *driver.NamedValue) (err error) {
+	nv.Value, err = converter{}.ConvertValue(nv.Value)
+	return
+}
+
+// ResetSession implements driver.SessionResetter.
+// (From Go 1.10)
+func (mc *mysqlConn) ResetSession(ctx context.Context) error {
+	if mc.closed.IsSet() {
+		return driver.ErrBadConn
+	}
+	return nil
+}

vendor/github.com/go-sql-driver/mysql/const.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+const (
+	defaultAuthPlugin       = "mysql_native_password"
+	defaultMaxAllowedPacket = 4 << 20 // 4 MiB
+	minProtocolVersion      = 10
+	maxPacketSize           = 1<<24 - 1
+	timeFormat              = "2006-01-02 15:04:05.999999"
+)
+
+// MySQL constants documentation:
+// http://dev.mysql.com/doc/internals/en/client-server-protocol.html
+
+const (
+	iOK           byte = 0x00
+	iAuthMoreData byte = 0x01
+	iLocalInFile  byte = 0xfb
+	iEOF          byte = 0xfe
+	iERR          byte = 0xff
+)
+
+// https://dev.mysql.com/doc/internals/en/capability-flags.html#packet-Protocol::CapabilityFlags
+type clientFlag uint32
+
+const (
+	clientLongPassword clientFlag = 1 << iota
+	clientFoundRows
+	clientLongFlag
+	clientConnectWithDB
+	clientNoSchema
+	clientCompress
+	clientODBC
+	clientLocalFiles
+	clientIgnoreSpace
+	clientProtocol41
+	clientInteractive
+	clientSSL
+	clientIgnoreSIGPIPE
+	clientTransactions
+	clientReserved
+	clientSecureConn
+	clientMultiStatements
+	clientMultiResults
+	clientPSMultiResults
+	clientPluginAuth
+	clientConnectAttrs
+	clientPluginAuthLenEncClientData
+	clientCanHandleExpiredPasswords
+	clientSessionTrack
+	clientDeprecateEOF
+)
+
+const (
+	comQuit byte = iota + 1
+	comInitDB
+	comQuery
+	comFieldList
+	comCreateDB
+	comDropDB
+	comRefresh
+	comShutdown
+	comStatistics
+	comProcessInfo
+	comConnect
+	comProcessKill
+	comDebug
+	comPing
+	comTime
+	comDelayedInsert
+	comChangeUser
+	comBinlogDump
+	comTableDump
+	comConnectOut
+	comRegisterSlave
+	comStmtPrepare
+	comStmtExecute
+	comStmtSendLongData
+	comStmtClose
+	comStmtReset
+	comSetOption
+	comStmtFetch
+)
+
+// https://dev.mysql.com/doc/internals/en/com-query-response.html#packet-Protocol::ColumnType
+type fieldType byte
+
+const (
+	fieldTypeDecimal fieldType = iota
+	fieldTypeTiny
+	fieldTypeShort
+	fieldTypeLong
+	fieldTypeFloat
+	fieldTypeDouble
+	fieldTypeNULL
+	fieldTypeTimestamp
+	fieldTypeLongLong
+	fieldTypeInt24
+	fieldTypeDate
+	fieldTypeTime
+	fieldTypeDateTime
+	fieldTypeYear
+	fieldTypeNewDate
+	fieldTypeVarChar
+	fieldTypeBit
+)
+const (
+	fieldTypeJSON fieldType = iota + 0xf5
+	fieldTypeNewDecimal
+	fieldTypeEnum
+	fieldTypeSet
+	fieldTypeTinyBLOB
+	fieldTypeMediumBLOB
+	fieldTypeLongBLOB
+	fieldTypeBLOB
+	fieldTypeVarString
+	fieldTypeString
+	fieldTypeGeometry
+)
+
+type fieldFlag uint16
+
+const (
+	flagNotNULL fieldFlag = 1 << iota
+	flagPriKey
+	flagUniqueKey
+	flagMultipleKey
+	flagBLOB
+	flagUnsigned
+	flagZeroFill
+	flagBinary
+	flagEnum
+	flagAutoIncrement
+	flagTimestamp
+	flagSet
+	flagUnknown1
+	flagUnknown2
+	flagUnknown3
+	flagUnknown4
+)
+
+// http://dev.mysql.com/doc/internals/en/status-flags.html
+type statusFlag uint16
+
+const (
+	statusInTrans statusFlag = 1 << iota
+	statusInAutocommit
+	statusReserved // Not in documentation
+	statusMoreResultsExists
+	statusNoGoodIndexUsed
+	statusNoIndexUsed
+	statusCursorExists
+	statusLastRowSent
+	statusDbDropped
+	statusNoBackslashEscapes
+	statusMetadataChanged
+	statusQueryWasSlow
+	statusPsOutParams
+	statusInTransReadonly
+	statusSessionStateChanged
+)
+
+const (
+	cachingSha2PasswordRequestPublicKey          = 2
+	cachingSha2PasswordFastAuthSuccess           = 3
+	cachingSha2PasswordPerformFullAuthentication = 4
+)

vendor/github.com/go-sql-driver/mysql/driver.go

+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+// Package mysql provides a MySQL driver for Go's database/sql package.
+//
+// The driver should be used via the database/sql package:
+//
+//  import "database/sql"
+//  import _ "github.com/go-sql-driver/mysql"
+//
+//  db, err := sql.Open("mysql", "user:password@/dbname")
+//
+// See https://github.com/go-sql-driver/mysql#usage for details
+package mysql
+
+import (
+	"database/sql"
+	"database/sql/driver"
+	"net"
+	"sync"
+)
+
+// watcher interface is used for context support (From Go 1.8)
+type watcher interface {
+	startWatcher()
+}
+
+// MySQLDriver is exported to make the driver directly accessible.
+// In general the driver is used via the database/sql package.
+type MySQLDriver struct{}
+
+// DialFunc is a function which can be used to establish the network connection.
+// Custom dial functions must be registered with RegisterDial
+type DialFunc func(addr string) (net.Conn, error)
+
+var (
+	dialsLock sync.RWMutex
+	dials     map[string]DialFunc
+)
+
+// RegisterDial registers a custom dial function. It can then be used by the
+// network address mynet(addr), where mynet is the registered new network.
+// addr is passed as a parameter to the dial function.
+func RegisterDial(net string, dial DialFunc) {
+	dialsLock.Lock()
+	defer dialsLock.Unlock()
+	if dials == nil {
+		dials = make(map[string]DialFunc)
+	}
+	dials[net] = dial
+}
+
+// Open new Connection.
+// See https://github.com/go-sql-driver/mysql#dsn-data-source-name for how
+// the DSN string is formated
+func (d MySQLDriver) Open(dsn string) (driver.Conn, error) {
+	var err error
+
+	// New mysqlConn
+	mc := &mysqlConn{
+		maxAllowedPacket: maxPacketSize,
+		maxWriteSize:     maxPacketSize - 1,
+		closech:          make(chan struct{}),
+	}
+	mc.cfg, err = ParseDSN(dsn)
+	if err != nil {
+		return nil, err
+	}
+	mc.parseTime = mc.cfg.ParseTime
+
+	// Connect to Server
+	dialsLock.RLock()
+	dial, ok := dials[mc.cfg.Net]
+	dialsLock.RUnlock()
+	if ok {
+		mc.netConn, err = dial(mc.cfg.Addr)
+	} else {
+		nd := net.Dialer{Timeout: mc.cfg.Timeout}
+		mc.netConn, err = nd.Dial(mc.cfg.Net, mc.cfg.Addr)
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	// Enable TCP Keepalives on TCP connections
+	if tc, ok := mc.netConn.(*net.TCPConn); ok {
+		if err := tc.SetKeepAlive(true); err != nil {
+			// Don't send COM_QUIT before handshake.
+			mc.netConn.Close()
+			mc.netConn = nil
+			return nil, err
+		}
+	}
+
+	// Call startWatcher for context support (From Go 1.8)
+	if s, ok := interface{}(mc).(watcher); ok {
+		s.startWatcher()
+	}
+
+	mc.buf = newBuffer(mc.netConn)
+
+	// Set I/O timeouts
+	mc.buf.timeout = mc.cfg.ReadTimeout
+	mc.writeTimeout = mc.cfg.WriteTimeout
+
+	// Reading Handshake Initialization Packet
+	authData, plugin, err := mc.readHandshakePacket()
+	if err != nil {
+		mc.cleanup()
+		return nil, err
+	}
+	if plugin == "" {
+		plugin = defaultAuthPlugin
+	}
+
+	// Send Client Authentication Packet
+	authResp, err := mc.auth(authData, plugin)
+	if err != nil {
+		// try the default auth plugin, if using the requested plugin failed
+		errLog.Print("could not use requested auth plugin '"+plugin+"': ", err.Error())
+		plugin = defaultAuthPlugin
+		authResp, err = mc.auth(authData, plugin)
+		if err != nil {
+			mc.cleanup()
+			return nil, err
+		}
+	}
+	if err = mc.writeHandshakeResponsePacket(authResp, plugin); err != nil {
+		mc.cleanup()
+		return nil, err
+	}
+
+	// Handle response to auth packet, switch methods if possible
+	if err = mc.handleAuthResult(authData, plugin); err != nil {
+		// Authentication failed and MySQL has already closed the connection
+		// (https://dev.mysql.com/doc/internals/en/authentication-fails.html).
+		// Do not send COM_QUIT, just cleanup and return the error.
+		mc.cleanup()
+		return nil, err
+	}
+
+	if mc.cfg.MaxAllowedPacket > 0 {
+		mc.maxAllowedPacket = mc.cfg.MaxAllowedPacket
+	} else {
+		// Get max allowed packet size
+		maxap, err := mc.getSystemVar("max_allowed_packet")
+		if err != nil {
+			mc.Close()
+			return nil, err
+		}
+		mc.maxAllowedPacket = stringToInt(maxap) - 1
+	}
+	if mc.maxAllowedPacket < maxPacketSize {
+		mc.maxWriteSize = mc.maxAllowedPacket
+	}
+
+	// Handle DSN Params
+	err = mc.handleParams()
+	if err != nil {
+		mc.Close()
+		return nil, err
+	}
+
+	return mc, nil
+}
+
+func init() {
+	sql.Register("mysql", &MySQLDriver{})
+}

vendor/github.com/go-sql-driver/mysql/errors.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"errors"
+	"fmt"
+	"log"
+	"os"
+)
+
+// Various errors the driver might return. Can change between driver versions.
+var (
+	ErrInvalidConn       = errors.New("invalid connection")
+	ErrMalformPkt        = errors.New("malformed packet")
+	ErrNoTLS             = errors.New("TLS requested but server does not support TLS")
+	ErrCleartextPassword = errors.New("this user requires clear text authentication. If you still want to use it, please add 'allowCleartextPasswords=1' to your DSN")
+	ErrNativePassword    = errors.New("this user requires mysql native password authentication.")
+	ErrOldPassword       = errors.New("this user requires old password authentication. If you still want to use it, please add 'allowOldPasswords=1' to your DSN. See also https://github.com/go-sql-driver/mysql/wiki/old_passwords")
+	ErrUnknownPlugin     = errors.New("this authentication plugin is not supported")
+	ErrOldProtocol       = errors.New("MySQL server does not support required protocol 41+")
+	ErrPktSync           = errors.New("commands out of sync. You can't run this command now")
+	ErrPktSyncMul        = errors.New("commands out of sync. Did you run multiple statements at once?")
+	ErrPktTooLarge       = errors.New("packet for query is too large. Try adjusting the 'max_allowed_packet' variable on the server")
+	ErrBusyBuffer        = errors.New("busy buffer")
+
+	// errBadConnNoWrite is used for connection errors where nothing was sent to the database yet.
+	// If this happens first in a function starting a database interaction, it should be replaced by driver.ErrBadConn
+	// to trigger a resend.
+	// See https://github.com/go-sql-driver/mysql/pull/302
+	errBadConnNoWrite = errors.New("bad connection")
+)
+
+var errLog = Logger(log.New(os.Stderr, "[mysql] ", log.Ldate|log.Ltime|log.Lshortfile))
+
+// Logger is used to log critical error messages.
+type Logger interface {
+	Print(v ...interface{})
+}
+
+// SetLogger is used to set the logger for critical errors.
+// The initial logger is os.Stderr.
+func SetLogger(logger Logger) error {
+	if logger == nil {
+		return errors.New("logger is nil")
+	}
+	errLog = logger
+	return nil
+}
+
+// MySQLError is an error type which represents a single MySQL error
+type MySQLError struct {
+	Number  uint16
+	Message string
+}
+
+func (me *MySQLError) Error() string {
+	return fmt.Sprintf("Error %d: %s", me.Number, me.Message)
+}

vendor/github.com/go-sql-driver/mysql/fields.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2017 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"database/sql"
+	"reflect"
+)
+
+func (mf *mysqlField) typeDatabaseName() string {
+	switch mf.fieldType {
+	case fieldTypeBit:
+		return "BIT"
+	case fieldTypeBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "TEXT"
+		}
+		return "BLOB"
+	case fieldTypeDate:
+		return "DATE"
+	case fieldTypeDateTime:
+		return "DATETIME"
+	case fieldTypeDecimal:
+		return "DECIMAL"
+	case fieldTypeDouble:
+		return "DOUBLE"
+	case fieldTypeEnum:
+		return "ENUM"
+	case fieldTypeFloat:
+		return "FLOAT"
+	case fieldTypeGeometry:
+		return "GEOMETRY"
+	case fieldTypeInt24:
+		return "MEDIUMINT"
+	case fieldTypeJSON:
+		return "JSON"
+	case fieldTypeLong:
+		return "INT"
+	case fieldTypeLongBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "LONGTEXT"
+		}
+		return "LONGBLOB"
+	case fieldTypeLongLong:
+		return "BIGINT"
+	case fieldTypeMediumBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "MEDIUMTEXT"
+		}
+		return "MEDIUMBLOB"
+	case fieldTypeNewDate:
+		return "DATE"
+	case fieldTypeNewDecimal:
+		return "DECIMAL"
+	case fieldTypeNULL:
+		return "NULL"
+	case fieldTypeSet:
+		return "SET"
+	case fieldTypeShort:
+		return "SMALLINT"
+	case fieldTypeString:
+		if mf.charSet == collations[binaryCollation] {
+			return "BINARY"
+		}
+		return "CHAR"
+	case fieldTypeTime:
+		return "TIME"
+	case fieldTypeTimestamp:
+		return "TIMESTAMP"
+	case fieldTypeTiny:
+		return "TINYINT"
+	case fieldTypeTinyBLOB:
+		if mf.charSet != collations[binaryCollation] {
+			return "TINYTEXT"
+		}
+		return "TINYBLOB"
+	case fieldTypeVarChar:
+		if mf.charSet == collations[binaryCollation] {
+			return "VARBINARY"
+		}
+		return "VARCHAR"
+	case fieldTypeVarString:
+		if mf.charSet == collations[binaryCollation] {
+			return "VARBINARY"
+		}
+		return "VARCHAR"
+	case fieldTypeYear:
+		return "YEAR"
+	default:
+		return ""
+	}
+}
+
+var (
+	scanTypeFloat32   = reflect.TypeOf(float32(0))
+	scanTypeFloat64   = reflect.TypeOf(float64(0))
+	scanTypeInt8      = reflect.TypeOf(int8(0))
+	scanTypeInt16     = reflect.TypeOf(int16(0))
+	scanTypeInt32     = reflect.TypeOf(int32(0))
+	scanTypeInt64     = reflect.TypeOf(int64(0))
+	scanTypeNullFloat = reflect.TypeOf(sql.NullFloat64{})
+	scanTypeNullInt   = reflect.TypeOf(sql.NullInt64{})
+	scanTypeNullTime  = reflect.TypeOf(NullTime{})
+	scanTypeUint8     = reflect.TypeOf(uint8(0))
+	scanTypeUint16    = reflect.TypeOf(uint16(0))
+	scanTypeUint32    = reflect.TypeOf(uint32(0))
+	scanTypeUint64    = reflect.TypeOf(uint64(0))
+	scanTypeRawBytes  = reflect.TypeOf(sql.RawBytes{})
+	scanTypeUnknown   = reflect.TypeOf(new(interface{}))
+)
+
+type mysqlField struct {
+	tableName string
+	name      string
+	length    uint32
+	flags     fieldFlag
+	fieldType fieldType
+	decimals  byte
+	charSet   uint8
+}
+
+func (mf *mysqlField) scanType() reflect.Type {
+	switch mf.fieldType {
+	case fieldTypeTiny:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint8
+			}
+			return scanTypeInt8
+		}
+		return scanTypeNullInt
+
+	case fieldTypeShort, fieldTypeYear:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint16
+			}
+			return scanTypeInt16
+		}
+		return scanTypeNullInt
+
+	case fieldTypeInt24, fieldTypeLong:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint32
+			}
+			return scanTypeInt32
+		}
+		return scanTypeNullInt
+
+	case fieldTypeLongLong:
+		if mf.flags&flagNotNULL != 0 {
+			if mf.flags&flagUnsigned != 0 {
+				return scanTypeUint64
+			}
+			return scanTypeInt64
+		}
+		return scanTypeNullInt
+
+	case fieldTypeFloat:
+		if mf.flags&flagNotNULL != 0 {
+			return scanTypeFloat32
+		}
+		return scanTypeNullFloat
+
+	case fieldTypeDouble:
+		if mf.flags&flagNotNULL != 0 {
+			return scanTypeFloat64
+		}
+		return scanTypeNullFloat
+
+	case fieldTypeDecimal, fieldTypeNewDecimal, fieldTypeVarChar,
+		fieldTypeBit, fieldTypeEnum, fieldTypeSet, fieldTypeTinyBLOB,
+		fieldTypeMediumBLOB, fieldTypeLongBLOB, fieldTypeBLOB,
+		fieldTypeVarString, fieldTypeString, fieldTypeGeometry, fieldTypeJSON,
+		fieldTypeTime:
+		return scanTypeRawBytes
+
+	case fieldTypeDate, fieldTypeNewDate,
+		fieldTypeTimestamp, fieldTypeDateTime:
+		// NullTime is always returned for more consistent behavior as it can
+		// handle both cases of parseTime regardless if the field is nullable.
+		return scanTypeNullTime
+
+	default:
+		return scanTypeUnknown
+	}
+}

vendor/github.com/go-sql-driver/mysql/infile.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2013 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"strings"
+	"sync"
+)
+
+var (
+	fileRegister       map[string]bool
+	fileRegisterLock   sync.RWMutex
+	readerRegister     map[string]func() io.Reader
+	readerRegisterLock sync.RWMutex
+)
+
+// RegisterLocalFile adds the given file to the file whitelist,
+// so that it can be used by "LOAD DATA LOCAL INFILE <filepath>".
+// Alternatively you can allow the use of all local files with
+// the DSN parameter 'allowAllFiles=true'
+//
+//  filePath := "/home/gopher/data.csv"
+//  mysql.RegisterLocalFile(filePath)
+//  err := db.Exec("LOAD DATA LOCAL INFILE '" + filePath + "' INTO TABLE foo")
+//  if err != nil {
+//  ...
+//
+func RegisterLocalFile(filePath string) {
+	fileRegisterLock.Lock()
+	// lazy map init
+	if fileRegister == nil {
+		fileRegister = make(map[string]bool)
+	}
+
+	fileRegister[strings.Trim(filePath, `"`)] = true
+	fileRegisterLock.Unlock()
+}
+
+// DeregisterLocalFile removes the given filepath from the whitelist.
+func DeregisterLocalFile(filePath string) {
+	fileRegisterLock.Lock()
+	delete(fileRegister, strings.Trim(filePath, `"`))
+	fileRegisterLock.Unlock()
+}
+
+// RegisterReaderHandler registers a handler function which is used
+// to receive a io.Reader.
+// The Reader can be used by "LOAD DATA LOCAL INFILE Reader::<name>".
+// If the handler returns a io.ReadCloser Close() is called when the
+// request is finished.
+//
+//  mysql.RegisterReaderHandler("data", func() io.Reader {
+//  	var csvReader io.Reader // Some Reader that returns CSV data
+//  	... // Open Reader here
+//  	return csvReader
+//  })
+//  err := db.Exec("LOAD DATA LOCAL INFILE 'Reader::data' INTO TABLE foo")
+//  if err != nil {
+//  ...
+//
+func RegisterReaderHandler(name string, handler func() io.Reader) {
+	readerRegisterLock.Lock()
+	// lazy map init
+	if readerRegister == nil {
+		readerRegister = make(map[string]func() io.Reader)
+	}
+
+	readerRegister[name] = handler
+	readerRegisterLock.Unlock()
+}
+
+// DeregisterReaderHandler removes the ReaderHandler function with
+// the given name from the registry.
+func DeregisterReaderHandler(name string) {
+	readerRegisterLock.Lock()
+	delete(readerRegister, name)
+	readerRegisterLock.Unlock()
+}
+
+func deferredClose(err *error, closer io.Closer) {
+	closeErr := closer.Close()
+	if *err == nil {
+		*err = closeErr
+	}
+}
+
+func (mc *mysqlConn) handleInFileRequest(name string) (err error) {
+	var rdr io.Reader
+	var data []byte
+	packetSize := 16 * 1024 // 16KB is small enough for disk readahead and large enough for TCP
+	if mc.maxWriteSize < packetSize {
+		packetSize = mc.maxWriteSize
+	}
+
+	if idx := strings.Index(name, "Reader::"); idx == 0 || (idx > 0 && name[idx-1] == '/') { // io.Reader
+		// The server might return an an absolute path. See issue #355.
+		name = name[idx+8:]
+
+		readerRegisterLock.RLock()
+		handler, inMap := readerRegister[name]
+		readerRegisterLock.RUnlock()
+
+		if inMap {
+			rdr = handler()
+			if rdr != nil {
+				if cl, ok := rdr.(io.Closer); ok {
+					defer deferredClose(&err, cl)
+				}
+			} else {
+				err = fmt.Errorf("Reader '%s' is <nil>", name)
+			}
+		} else {
+			err = fmt.Errorf("Reader '%s' is not registered", name)
+		}
+	} else { // File
+		name = strings.Trim(name, `"`)
+		fileRegisterLock.RLock()
+		fr := fileRegister[name]
+		fileRegisterLock.RUnlock()
+		if mc.cfg.AllowAllFiles || fr {
+			var file *os.File
+			var fi os.FileInfo
+
+			if file, err = os.Open(name); err == nil {
+				defer deferredClose(&err, file)
+
+				// get file size
+				if fi, err = file.Stat(); err == nil {
+					rdr = file
+					if fileSize := int(fi.Size()); fileSize < packetSize {
+						packetSize = fileSize
+					}
+				}
+			}
+		} else {
+			err = fmt.Errorf("local file '%s' is not registered", name)
+		}
+	}
+
+	// send content packets
+	// if packetSize == 0, the Reader contains no data
+	if err == nil && packetSize > 0 {
+		data := make([]byte, 4+packetSize)
+		var n int
+		for err == nil {
+			n, err = rdr.Read(data[4:])
+			if n > 0 {
+				if ioErr := mc.writePacket(data[:4+n]); ioErr != nil {
+					return ioErr
+				}
+			}
+		}
+		if err == io.EOF {
+			err = nil
+		}
+	}
+
+	// send empty packet (termination)
+	if data == nil {
+		data = make([]byte, 4)
+	}
+	if ioErr := mc.writePacket(data[:4]); ioErr != nil {
+		return ioErr
+	}
+
+	// read OK packet
+	if err == nil {
+		return mc.readResultOK()
+	}
+
+	mc.readPacket()
+	return err
+}

vendor/github.com/go-sql-driver/mysql/result.go

+// Go MySQL Driver - A MySQL-Driver for Go's database/sql package
+//
+// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved.
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this file,
+// You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package mysql
+
+type mysqlResult struct {
+	affectedRows int64
+	insertId     int64
+}
+
+func (res *mysqlResult) LastInsertId() (int64, error) {
+	return res.insertId, nil
+}
+
+func (res *mysqlResult) RowsAffected() (int64, error) {
+	return res.affectedRows, nil
+}