misc/dashboard/builder: Go implementation of continuous build client

R=rsc, r
CC=golang-dev
https://golang.org/cl/2112042

misc/dashboard/builder/Makefile

+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+include ../../../src/Make.inc
+
+TARG=gobuilder
+GOFILES=\
+	exec.go\
+	hg.go\
+	http.go\
+	main.go\
+
+include ../../../src/Make.cmd

misc/dashboard/builder/doc.go

+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+
+Go Builder is a continuous build client for the Go project. 
+It integrates with the Go Dashboard AppEngine application.
+
+Go Builder is intended to run continuously as a background process.
+
+It periodically pulls updates from the Go Mercurial repository. 
+
+When a newer revision is found, Go Builder creates a clone of the repository,
+runs all.bash, and reports build success or failure to the Go Dashboard. 
+
+For a successful build, Go Builder will also run benchmarks 
+(cd $GOROOT/src/pkg; make bench) and send the results to the Go Dashboard.
+
+For release revision (a change description that matches "release.YYYY-MM-DD"),
+Go Builder will create a tar.gz archive of the GOROOT and deliver it to the
+Go Google Code project's downloads section.
+
+Command-line options (and defaults):
+
+  -goarch="": $GOARCH
+  -goos="": $GOOS
+    The target architecture and operating system of this build client.
+
+  -goroot="": $GOROOT
+    A persistent Go checkout. Go Builder will periodically run 'hg pull -u' 
+    from this location and use it as a source repository when cloning a
+    revision to be built.
+
+  -path="": Build Path
+    The base path in which building, testing, and archival will occur,
+    such as "/tmp/build".  This can be considered volatile.
+
+  -keyfile="": Key File
+    The file containing the build key and Google Code credentials.
+    It is a text file of the format:
+
+      godashboard-key
+      googlecode-username
+      googlecode-password
+
+    If the Google Code credentials are not provided the archival step
+    will be skipped.
+
+  -host="godashboard.appspot.com": Go Dashboard Host
+    The location of the Go Dashboard application to which Go Builder will
+    report its results.
+
+  -pybin="/usr/bin/python": Python Binary
+  -hgbin="/usr/local/bin/hg": Mercurial Binary
+    These name the local Python and Mercurial binaries.
+    (Python is required only to run the Google Code uploader script, found
+     at $GOROOT/misc/dashboard/googlecode_upload.py.)
+
+*/
+package documentation

misc/dashboard/builder/exec.go

+package main
+
+import (
+	"bytes"
+	"exec"
+	"os"
+)
+
+// run is a simple wrapper for exec.Run/Close
+func run(envv []string, dir string, argv ...string) os.Error {
+	bin, err := exec.LookPath(argv[0])
+	if err != nil {
+		return err
+	}
+	p, err := exec.Run(bin, argv, envv, dir,
+		exec.DevNull, exec.DevNull, exec.PassThrough)
+	if err != nil {
+		return err
+	}
+	return p.Close()
+}
+
+// runLog runs a process and returns the combined stdout/stderr
+func runLog(envv []string, dir string, argv ...string) (o string, s int, err os.Error) {
+	s = -1
+	bin, err := exec.LookPath(argv[0])
+	if err != nil {
+		return
+	}
+	p, err := exec.Run(bin, argv, envv, dir,
+		exec.DevNull, exec.Pipe, exec.MergeWithStdout)
+	if err != nil {
+		return
+	}
+	b := new(bytes.Buffer)
+	_, err = b.ReadFrom(p.Stdout)
+	if err != nil {
+		return
+	}
+	w, err := p.Wait(0)
+	if err != nil {
+		return
+	}
+	return b.String(), w.WaitStatus.ExitStatus(), nil
+}

misc/dashboard/builder/hg.go

+package main
+
+import (
+	"os"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+type Commit struct {
+	num    int    // mercurial revision number
+	node   string // mercurial hash
+	parent string // hash of commit's parent
+	user   string // author's name and email
+	date   string // date of commit
+	desc   string // description
+}
+
+// getCommit returns details about the Commit specified by the revision hash
+func getCommit(rev string) (c Commit, err os.Error) {
+	defer func() {
+		if err != nil {
+			err = os.NewError(fmt.Sprintf("getCommit: %s: %s",
+				rev, err))
+		}
+	}()
+	parts, err := getCommitParts(rev)
+	if err != nil {
+		return
+	}
+	num, err := strconv.Atoi(parts[0])
+	if err != nil {
+		return
+	}
+	parent := ""
+	if num > 0 {
+		prev := strconv.Itoa(num - 1)
+		if pparts, err := getCommitParts(prev); err == nil {
+			parent = pparts[1]
+		}
+	}
+	user := strings.Replace(parts[2], "&lt;", "<", -1)
+	user = strings.Replace(user, "&gt;", ">", -1)
+	return Commit{num, parts[1], parent, user, parts[3], parts[4]}, nil
+}
+
+func getCommitParts(rev string) (parts []string, err os.Error) {
+	format := "{rev}>{node|escape}>{author|escape}>{date}>{desc}"
+	s, _, err := runLog(nil, goroot,
+		"hg", "log", "-r", rev, "-l", "1", "--template", format)
+	if err != nil {
+		return
+	}
+	return strings.Split(s, ">", -1), nil
+}
+

misc/dashboard/builder/http.go

+package main
+
+import (
+	"bytes"
+	"encoding/base64"
+	"encoding/binary"
+	"fmt"
+	"http"
+	"os"
+	"regexp"
+)
+
+// getHighWater returns the current highwater revision hash for this builder
+func (b *Builder) getHighWater() (rev string, err os.Error) {
+	url := fmt.Sprintf("http://%s/hw-get?builder=%s",
+		*dashboardhost, b.name)
+	r, _, err := http.Get(url)
+	if err != nil {
+		return
+	}
+	buf := new(bytes.Buffer)
+	_, err = buf.ReadFrom(r.Body)
+	if err != nil {
+		return
+	}
+	r.Body.Close()
+	return buf.String(), nil
+}
+
+// recordResult sends build results to the dashboard
+func (b *Builder) recordResult(buildLog string, c Commit) os.Error {
+	return httpCommand("build", map[string]string{
+		"builder": b.name,
+		"key":     b.key,
+		"node":    c.node,
+		"parent":  c.parent,
+		"user":    c.user,
+		"date":    c.date,
+		"desc":    c.desc,
+		"log":     buildLog,
+	})
+}
+
+// match lines like: "package.BechmarkFunc	100000	    999 ns/op"
+var benchmarkRegexp = regexp.MustCompile("([^\n\t ]+)[\t ]+([0-9]+)[\t ]+([0-9]+) ns/op")
+
+// recordBenchmarks sends benchmark results to the dashboard
+func (b *Builder) recordBenchmarks(benchLog string, c Commit) os.Error {
+	results := benchmarkRegexp.FindAllStringSubmatch(benchLog, -1)
+	var buf bytes.Buffer
+	b64 := base64.NewEncoder(base64.StdEncoding, &buf)
+	for _, r := range results {
+		for _, s := range r[1:] {
+			binary.Write(b64, binary.BigEndian, uint16(len(s)))
+			b64.Write([]byte(s))
+		}
+	}
+	b64.Close()
+	return httpCommand("benchmarks", map[string]string{
+		"builder":       b.name,
+		"key":           b.key,
+		"node":          c.node,
+		"benchmarkdata": buf.String(),
+	})
+}
+
+func httpCommand(cmd string, args map[string]string) os.Error {
+	url := fmt.Sprintf("http://%v/%v", *dashboardhost, cmd)
+	_, err := http.PostForm(url, args)
+	return err
+}

misc/dashboard/builder/main.go

+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+	"regexp"
+	"strconv"
+	"strings"
+	"time"
+)
+
+const (
+	codeProject  = "go"
+	codePyScript = "misc/dashboard/googlecode_upload.py"
+	hgUrl        = "https://go.googlecode.com/hg/"
+	waitInterval = 10e9 // time to wait before checking for new revs
+)
+
+var (
+	goroot        = path.Join(os.Getenv("PWD"), "goroot")
+	releaseRegexp = regexp.MustCompile(`^release\.[0-9\-]+`)
+	dashboardhost = flag.String("dashboard", "godashboard.appspot.com",
+		"Godashboard Host")
+)
+
+type Builder struct {
+	name         string
+	goos, goarch string
+	key          string
+	codeUsername string
+	codePassword string
+}
+
+func main() {
+	flag.Parse()
+	builders := make(map[string]*Builder)
+	if len(flag.Args()) == 0{
+		log.Exit("No builders specified.")
+	}
+	for _, builder := range flag.Args() {
+		b, err := NewBuilder(builder)
+		if err != nil {
+			log.Exit(err)
+		}
+		builders[builder] = b
+	}
+	err := run(nil, "", "hg", "clone", hgUrl, goroot)
+	if err != nil {
+		log.Exit("Error cloning repository:", err)
+	}
+	// check for new commits and build them
+	for {
+		err := run(nil, goroot, "hg", "pull", "-u")
+		if err != nil {
+			log.Stderr("hg pull failed:", err)
+			time.Sleep(waitInterval)
+			continue
+		}
+		built := false
+		for _, b := range builders {
+			built = b.tryBuild() || built
+		}
+		// only wait if we didn't do anything
+		if !built {
+			time.Sleep(waitInterval)
+		}
+	}
+}
+
+func NewBuilder(builder string) (*Builder, os.Error) {
+	b := &Builder{name:builder}
+
+	// get goos/goarch from builder string
+	s := strings.Split(builder, "-", 3)
+	if len(s) == 2 {
+		b.goos, b.goarch = s[0], s[1]
+	} else {
+		return nil, os.NewError(fmt.Sprintf(
+			"unsupported builder form: %s", builder))
+	}
+
+	// read keys from keyfile
+	fn := path.Join(os.Getenv("HOME"), ".gobuildkey")
+	if isFile(fn + "-" + b.name) { // builder-specific file
+		fn += "-" + b.name
+	}
+	c, err := ioutil.ReadFile(fn)
+	if err != nil {
+		return nil, os.NewError(fmt.Sprintf("readKeys %s (%s): %s",
+			b.name, fn, err))
+	}
+	v := strings.Split(string(c), "\n", -1)
+	b.key = v[0]
+	if len(v) >= 3 {
+		b.codeUsername, b.codePassword = v[1], v[2]
+	}
+
+	return b, nil
+}
+
+// tryBuild checks for a new commit for this builder, 
+// and builds it if one is found. 
+// Its return value indicates whether a build happened or not.
+func (b *Builder) tryBuild() bool {
+	c, err := b.nextCommit()
+	if err != nil {
+		log.Stderr(err)
+		return false
+	}
+	if c == nil {
+		return false
+	}
+	log.Stderr("Building new revision: ", c.num)
+	err = b.build(*c)
+	if err != nil {
+		log.Stderr(err)
+	}
+	return true
+}
+
+// nextCommit returns the next unbuilt Commit for this builder
+func (b *Builder) nextCommit() (nextC *Commit, err os.Error) {
+	defer func() {
+		if err != nil {
+			err = os.NewError(fmt.Sprintf(
+				"%s nextCommit: %s", b.name, err))
+		}
+	}()
+	hw, err := b.getHighWater()
+	if err != nil {
+		return
+	}
+	c, err := getCommit(hw)
+	if err != nil {
+		return
+	}
+	next := c.num + 1
+	c, err = getCommit(strconv.Itoa(next))
+	if err == nil || c.num == next {
+		return &c, nil
+	}
+	return nil, nil
+}
+
+func (b *Builder) build(c Commit) (err os.Error) {
+	defer func() {
+		if err != nil {
+			err = os.NewError(fmt.Sprintf(
+				"%s buildRev commit: %s: %s",
+				b.name, c.num, err))
+		}
+	}()
+
+	// destroy old build candidate
+	err = run(nil, "", "rm", "-Rf", "go")
+	if err != nil {
+		return
+	}
+
+	// clone repo at revision num (new candidate)
+	err = run(nil, "", 
+		"hg", "clone", 
+		"-r", strconv.Itoa(c.num), 
+		goroot, "go")
+	if err != nil {
+		return
+	}
+
+	// set up environment for build/bench execution
+	env := []string{
+		"GOOS=" + b.goos,
+		"GOARCH=" + b.goarch,
+		"GOROOT_FINAL=/usr/local/go",
+		"PATH=" + os.Getenv("PATH"),
+	}
+	srcDir := path.Join("", "go", "src")
+
+	// build the release candidate
+	buildLog, status, err := runLog(env, srcDir, "./all.bash")
+	if err != nil {
+		return
+	}
+	if status != 0 {
+		// record failure
+		return b.recordResult(buildLog, c)
+	}
+
+	// record success
+	if err = b.recordResult("", c); err != nil {
+		return
+	}
+
+	// run benchmarks and send to dashboard
+	pkgDir := path.Join(srcDir, "pkg")
+	benchLog, _, err := runLog(env, pkgDir, "gomake", "bench")
+	if err != nil {
+		log.Stderr("gomake bench:", err)
+	} else if err = b.recordBenchmarks(benchLog, c); err != nil {
+		log.Stderr("recordBenchmarks:", err)
+	}
+
+	// finish here if codeUsername and codePassword aren't set
+	if b.codeUsername == "" || b.codePassword == "" {
+		return
+	}
+
+	// if this is a release, create tgz and upload to google code
+	if release := releaseRegexp.FindString(c.desc); release != "" {
+		// clean out build state
+		err = run(env, srcDir, "sh", "clean.bash", "--nopkg")
+		if err != nil {
+			return
+		}
+		// upload binary release
+		err = b.codeUpload(release)
+		if err != nil {
+			return
+		}
+	}
+
+	return
+}
+
+func (b *Builder) codeUpload(release string) (err os.Error) {
+	defer func() {
+		if err != nil {
+			err = os.NewError(fmt.Sprintf(
+				"%s codeUpload release: %s: %s",
+				b.name, release, err))
+		}
+	}()
+	fn := fmt.Sprintf("%s.%s-%s.tar.gz", release, b.goos, b.goarch)
+	err = run(nil, "", "tar", "czf", fn, "go")
+	if err != nil {
+		return
+	}
+	return run(nil, "", "python", 
+		path.Join(goroot, codePyScript),
+		"-s", release, 
+		"-p", codeProject,
+		"-u", b.codeUsername, 
+		"-w", b.codePassword,
+		"-l", fmt.Sprintf("%s,%s", b.goos, b.goarch),
+		fn)
+}
+
+func isDirectory(name string) bool {
+	s, err := os.Stat(name)
+	return err == nil && s.IsDirectory()
+}
+
+func isFile(name string) bool {
+	s, err := os.Stat(name)
+	return err == nil && (s.IsRegular() || s.IsSymlink())
+}