forked from golang/build
/
coordinator.go
2804 lines (2547 loc) · 80.3 KB
/
coordinator.go
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// Copyright 2014 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.
// The coordinator runs the majority of the Go build system.
//
// It is responsible for finding build work and executing it,
// reporting the results to build.golang.org for public display.
//
// For an overview of the Go build system, see the README at
// the root of the x/build repo.
package main // import "golang.org/x/build/cmd/coordinator"
import (
"archive/tar"
"bytes"
"compress/gzip"
"crypto/sha1"
"crypto/tls"
"encoding/json"
"errors"
"flag"
"fmt"
"html"
"html/template"
"io"
"io/ioutil"
"log"
"net"
"net/http"
_ "net/http/pprof"
"os"
"path"
"runtime"
"sort"
"strings"
"sync"
"time"
"go4.org/syncutil"
"golang.org/x/build"
"golang.org/x/build/buildlet"
"golang.org/x/build/dashboard"
"golang.org/x/build/gerrit"
"golang.org/x/build/internal/lru"
"golang.org/x/build/internal/singleflight"
"golang.org/x/build/livelog"
"golang.org/x/build/types"
"golang.org/x/net/context"
"google.golang.org/cloud/storage"
)
const subrepoPrefix = "golang.org/x/"
var processStartTime = time.Now()
var Version string // set by linker -X
// devPause is a debug option to pause for 5 minutes after the build
// finishes before destroying buildlets.
const devPause = false
var (
role = flag.String("role", "coordinator", "Which role this binary should run as. Valid options: coordinator, watcher")
masterKeyFile = flag.String("masterkey", "", "Path to builder master key. Else fetched using GCE project attribute 'builder-master-key'.")
mode = flag.String("mode", "", "Valid modes are 'dev', 'prod', or '' for auto-detect. dev means localhost development, not be confused with staging on go-dashboard-dev, which is still the 'prod' mode.")
buildEnvName = flag.String("env", "", "The build environment configuration to use. Not required if running on GCE, but will override GCE default config if set.")
devEnableGCE = flag.Bool("dev_gce", false, "Whether or not to enable the GCE pool when in dev mode. The pool is enabled by default in prod mode.")
)
// LOCK ORDER:
// statusMu, buildStatus.mu, trySet.mu
// (Other locks, such as subrepoHead.Mutex or the remoteBuildlet mutex should
// not be used along with other locks)
var (
startTime = time.Now()
statusMu sync.Mutex // guards the following four structures; see LOCK ORDER comment above
status = map[builderRev]*buildStatus{}
statusDone []*buildStatus // finished recently, capped to maxStatusDone
tries = map[tryKey]*trySet{} // trybot builds
tryList []tryKey
)
var (
tryBuilders []dashboard.BuildConfig // for testing the go repo
subTryBuilders []dashboard.BuildConfig // for testing sub-repos
)
func initTryBuilders() {
tryList := []string{
"misc-compile",
"darwin-amd64-10_10",
"linux-386",
"linux-amd64",
"linux-amd64-race",
"freebsd-386-gce101",
"freebsd-amd64-gce101",
"windows-386-gce",
"windows-amd64-gce",
"openbsd-386-gce58",
"openbsd-amd64-gce58",
"plan9-386",
"nacl-386",
"nacl-amd64p32",
"linux-arm",
}
for _, bname := range tryList {
conf, ok := dashboard.Builders[bname]
if ok {
tryBuilders = append(tryBuilders, conf)
if conf.BuildSubrepos() {
subTryBuilders = append(subTryBuilders, conf)
}
} else {
log.Printf("ignoring invalid try builder config %q", bname)
}
}
}
const (
maxStatusDone = 30
// vmDeleteTimeout and podDeleteTimeout is how long before we delete a VM.
// In practice this need only be as long as the slowest
// builder (plan9 currently), because on startup this program
// already deletes all buildlets it doesn't know about
// (i.e. ones from a previous instance of the coordinator).
vmDeleteTimeout = 45 * time.Minute
podDeleteTimeout = 45 * time.Minute
)
func readGCSFile(name string) ([]byte, error) {
if *mode == "dev" {
b, ok := testFiles[name]
if !ok {
return nil, &os.PathError{
Op: "open",
Path: name,
Err: os.ErrNotExist,
}
}
return []byte(b), nil
}
r, err := storageClient.Bucket(buildEnv.BuildletBucket).Object(name).NewReader(serviceCtx)
if err != nil {
return nil, err
}
defer r.Close()
return ioutil.ReadAll(r)
}
// Fake keys signed by a fake CA.
// These are used in localhost dev mode. (Not to be confused with the
// staging "dev" instance under GCE project "go-dashboard-dev")
var testFiles = map[string]string{
"farmer-cert.pem": build.DevCoordinatorCA,
"farmer-key.pem": build.DevCoordinatorKey,
}
func listenAndServeTLS() {
addr := ":443"
if *mode == "dev" {
addr = "localhost:8119"
}
ln, err := net.Listen("tcp", addr)
if err != nil {
log.Fatalf("net.Listen(%s): %v", addr, err)
}
serveTLS(ln)
}
func serveTLS(ln net.Listener) {
certPEM, err := readGCSFile("farmer-cert.pem")
if err != nil {
log.Printf("cannot load TLS cert, skipping https: %v", err)
return
}
keyPEM, err := readGCSFile("farmer-key.pem")
if err != nil {
log.Printf("cannot load TLS key, skipping https: %v", err)
return
}
cert, err := tls.X509KeyPair(certPEM, keyPEM)
if err != nil {
log.Printf("bad TLS cert: %v", err)
return
}
server := &http.Server{
Addr: ln.Addr().String(),
Handler: httpRouter{},
}
config := &tls.Config{
NextProtos: []string{"http/1.1"},
Certificates: []tls.Certificate{cert},
}
tlsLn := tls.NewListener(tcpKeepAliveListener{ln.(*net.TCPListener)}, config)
log.Printf("Coordinator serving on: %v", tlsLn.Addr())
if err := server.Serve(tlsLn); err != nil {
log.Fatalf("serve https: %v", err)
}
}
type tcpKeepAliveListener struct {
*net.TCPListener
}
func (ln tcpKeepAliveListener) Accept() (c net.Conn, err error) {
tc, err := ln.AcceptTCP()
if err != nil {
return
}
tc.SetKeepAlive(true)
tc.SetKeepAlivePeriod(3 * time.Minute)
return tc, nil
}
type eventTimeLoggerFunc func(event string, optText ...string)
func (fn eventTimeLoggerFunc) logEventTime(event string, optText ...string) {
fn(event, optText...)
}
func main() {
flag.Parse()
switch *role {
default:
log.Fatalf("unsupported role %q", *role)
case "watcher":
watcherMain()
panic("watcherMain finished")
case "coordinator":
// fall through
}
log.Printf("coordinator version %q starting", Version)
err := initGCE()
if err != nil {
if *mode == "" {
*mode = "dev"
}
log.Printf("VM support disabled due to error initializing GCE: %v", err)
} else {
if *mode == "" {
*mode = "prod"
}
}
// TODO(evanbrown: disable kubePool if init fails)
err = initKube()
if err != nil {
kubeErr = err
log.Printf("Kube support disabled due to eror initializing Kubernetes: %v", err)
}
switch *mode {
case "dev", "prod":
log.Printf("Running in %s mode", *mode)
default:
log.Fatalf("Unknown mode: %q", *mode)
}
http.HandleFunc("/", handleStatus)
http.HandleFunc("/debug/goroutines", handleDebugGoroutines)
http.HandleFunc("/debug/watcher", handleDebugWatcher)
http.HandleFunc("/builders", handleBuilders)
http.HandleFunc("/temporarylogs", handleLogs)
http.HandleFunc("/reverse", handleReverse)
http.HandleFunc("/style.css", handleStyleCSS)
http.HandleFunc("/try", handleTryStatus)
http.Handle("/buildlet/create", requireBuildletProxyAuth(http.HandlerFunc(handleBuildletCreate)))
http.Handle("/buildlet/list", requireBuildletProxyAuth(http.HandlerFunc(handleBuildletList)))
go func() {
if *mode == "dev" {
return
}
err := http.ListenAndServe(":80", httpRouter{})
if err != nil {
log.Fatalf("http.ListenAndServe:80: %v", err)
}
}()
workc := make(chan builderRev)
if *mode == "dev" {
// TODO(crawshaw): do more in test mode
gcePool.SetEnabled(*devEnableGCE)
http.HandleFunc("/dosomework/", handleDoSomeWork(workc))
} else {
go gcePool.cleanUpOldVMs()
if kubeErr == nil {
go kubePool.cleanUpOldPods(context.Background())
}
if inStaging {
dashboard.Builders = stagingClusterBuilders()
}
initTryBuilders()
// Start the Docker processes on this host polling Gerrit and
// pinging build.golang.org when new commits are available.
startWatchers() // in watcher.go
go findWorkLoop(workc)
go findTryWorkLoop()
// TODO(cmang): gccgo will need its own findWorkLoop
}
go listenAndServeTLS()
ticker := time.NewTicker(1 * time.Minute)
for {
select {
case work := <-workc:
if !mayBuildRev(work) {
if inStaging {
log.Printf("may not build %v; skipping", work)
}
continue
}
st, err := newBuild(work)
if err != nil {
log.Printf("Bad build work params %v: %v", work, err)
} else {
st.start()
}
case <-ticker.C:
if numCurrentBuilds() == 0 && time.Now().After(startTime.Add(10*time.Minute)) {
// TODO: halt the whole machine to kill the VM or something
}
}
}
}
func stagingClusterBuilders() map[string]dashboard.BuildConfig {
m := map[string]dashboard.BuildConfig{}
for _, name := range []string{
"linux-arm",
"linux-amd64",
"linux-amd64-kube",
"linux-amd64-race",
"windows-amd64-gce",
"plan9-386",
} {
m[name] = dashboard.Builders[name]
}
return m
}
func numCurrentBuilds() int {
statusMu.Lock()
defer statusMu.Unlock()
return len(status)
}
func isBuilding(work builderRev) bool {
statusMu.Lock()
defer statusMu.Unlock()
_, building := status[work]
return building
}
// mayBuildRev reports whether the build type & revision should be started.
// It returns true if it's not already building, and if a reverse buildlet is
// required, if an appropriate machine is registered.
func mayBuildRev(rev builderRev) bool {
if isBuilding(rev) {
return false
}
if inStaging && numCurrentBuilds() != 0 {
return false
}
if strings.Contains(rev.name, "netbsd") {
return false
}
if dashboard.Builders[rev.name].IsReverse {
return reversePool.CanBuild(rev.name)
}
return true
}
func setStatus(work builderRev, st *buildStatus) {
statusMu.Lock()
defer statusMu.Unlock()
// TODO: panic if status[work] already exists. audit all callers.
// For instance, what if a trybot is running, and then the CL is merged
// and the findWork goroutine picks it up and it has the same commit,
// because it didn't need to be rebased in Gerrit's cherrypick?
// Could we then have two running with the same key?
status[work] = st
}
func markDone(work builderRev) {
statusMu.Lock()
defer statusMu.Unlock()
st, ok := status[work]
if !ok {
return
}
delete(status, work)
if len(statusDone) == maxStatusDone {
copy(statusDone, statusDone[1:])
statusDone = statusDone[:len(statusDone)-1]
}
statusDone = append(statusDone, st)
}
// statusPtrStr disambiguates which status to return if there are
// multiple in the history (e.g. recent failures where the build
// didn't finish for reasons outside of all.bash failing)
func getStatus(work builderRev, statusPtrStr string) *buildStatus {
statusMu.Lock()
defer statusMu.Unlock()
match := func(st *buildStatus) bool {
return statusPtrStr == "" || fmt.Sprintf("%p", st) == statusPtrStr
}
if st, ok := status[work]; ok && match(st) {
return st
}
for _, st := range statusDone {
if st.builderRev == work && match(st) {
return st
}
}
return nil
}
type byAge []*buildStatus
func (s byAge) Len() int { return len(s) }
func (s byAge) Less(i, j int) bool { return s[i].startTime.Before(s[j].startTime) }
func (s byAge) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
func handleTryStatus(w http.ResponseWriter, r *http.Request) {
ts := trySetOfCommitPrefix(r.FormValue("commit"))
if ts == nil {
http.Error(w, "TryBot result not found (already done, invalid, or not yet discovered from Gerrit). Check Gerrit for results.", http.StatusNotFound)
return
}
ts.mu.Lock()
tss := ts.trySetState.clone()
ts.mu.Unlock()
w.Header().Set("Content-Type", "text/html; charset=utf-8")
fmt.Fprintf(w, "<html><head><title>trybot status</title></head><body>[<a href='/'>overall status</a>] > %s\n", ts.ChangeID)
fmt.Fprintf(w, "<h1>trybot status</h1>")
fmt.Fprintf(w, "Change-ID: <a href='https://go-review.googlesource.com/#/q/%s'>%s</a><br>\n", ts.ChangeID, ts.ChangeID)
fmt.Fprintf(w, "Commit: <a href='https://go-review.googlesource.com/#/q/%s'>%s</a><br>\n", ts.Commit, ts.Commit)
fmt.Fprintf(w, "<p>Builds remain: %d</p>\n", tss.remain)
fmt.Fprintf(w, "<p>Builds failed: %v</p>\n", tss.failed)
fmt.Fprintf(w, "<p>Builds</p><table cellpadding=5 border=1>\n")
for _, bs := range tss.builds {
status := "<i>(running)</i>"
bs.mu.Lock()
if !bs.done.IsZero() {
if bs.succeeded {
status = "pass"
} else {
status = "<b>FAIL</b>"
}
}
bs.mu.Unlock()
fmt.Fprintf(w, "<tr valign=top><td align=left>%s</td><td align=center>%s</td><td><pre>%s</pre></td></tr>\n",
bs.name,
status,
bs.HTMLStatusLine())
}
fmt.Fprintf(w, "</table></body></html>")
}
func trySetOfCommitPrefix(commitPrefix string) *trySet {
if commitPrefix == "" {
return nil
}
statusMu.Lock()
defer statusMu.Unlock()
for k, ts := range tries {
if strings.HasPrefix(k.Commit, commitPrefix) {
return ts
}
}
return nil
}
func handleLogs(w http.ResponseWriter, r *http.Request) {
br := builderRev{
name: r.FormValue("name"),
rev: r.FormValue("rev"),
subName: r.FormValue("subName"), // may be empty
subRev: r.FormValue("subRev"), // may be empty
}
st := getStatus(br, r.FormValue("st"))
if st == nil {
http.NotFound(w, r)
return
}
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
w.Header().Set("X-Content-Type-Options", "nosniff")
writeStatusHeader(w, st)
nostream := r.FormValue("nostream") != ""
if nostream || !st.isRunning() {
if nostream {
fmt.Fprintf(w, "\n\n(live streaming disabled; reload manually to see status)\n")
}
w.Write(st.output.Bytes())
return
}
if !st.hasEvent("pre_exec") {
fmt.Fprintf(w, "\n\n(buildlet still starting; no live streaming. reload manually to see status)\n")
return
}
w.(http.Flusher).Flush()
output := st.output.Reader()
go func() {
<-w.(http.CloseNotifier).CloseNotify()
output.Close()
}()
buf := make([]byte, 65536)
for {
n, err := output.Read(buf)
if _, err2 := w.Write(buf[:n]); err2 != nil {
return
}
w.(http.Flusher).Flush()
if err != nil {
break
}
}
}
func handleDebugGoroutines(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
buf := make([]byte, 1<<20)
buf = buf[:runtime.Stack(buf, true)]
w.Write(buf)
}
func writeStatusHeader(w http.ResponseWriter, st *buildStatus) {
st.mu.Lock()
defer st.mu.Unlock()
fmt.Fprintf(w, " builder: %s\n", st.name)
fmt.Fprintf(w, " rev: %s\n", st.rev)
workaroundFlush(w)
fmt.Fprintf(w, " buildlet: %s\n", st.bc)
fmt.Fprintf(w, " started: %v\n", st.startTime)
done := !st.done.IsZero()
if done {
fmt.Fprintf(w, " ended: %v\n", st.done)
fmt.Fprintf(w, " success: %v\n", st.succeeded)
} else {
fmt.Fprintf(w, " status: still running\n")
}
if len(st.events) > 0 {
io.WriteString(w, "\nEvents:\n")
st.writeEventsLocked(w, false)
}
io.WriteString(w, "\nBuild log:\n")
workaroundFlush(w)
}
// workaroundFlush is an unnecessary flush to work around a bug in Chrome.
// See https://code.google.com/p/chromium/issues/detail?id=2016 for the details.
// In summary: a couple unnecessary chunk flushes bypass the content type
// sniffing which happen (even if unused?), even if you set nosniff as we do
// in func handleLogs.
func workaroundFlush(w http.ResponseWriter) {
w.(http.Flusher).Flush()
}
// findWorkLoop polls http://build.golang.org/?mode=json looking for new work
// for the main dashboard. It does not support gccgo.
// TODO(bradfitz): it also currently does not support subrepos.
func findWorkLoop(work chan<- builderRev) {
// Useful for debugging a single run:
if inStaging && true {
//work <- builderRev{name: "linux-arm", rev: "c9778ec302b2e0e0d6027e1e0fca892e428d9657", subName: "tools", subRev: "ac303766f5f240c1796eeea3dc9bf34f1261aa35"}
//work <- builderRev{name: "linux-amd64", rev: "54789eff385780c54254f822e09505b6222918e2"}
//work <- builderRev{name: "windows-amd64-gce", rev: "54789eff385780c54254f822e09505b6222918e2"}
log.Printf("Test work awaiting arm")
for !reversePool.CanBuild("linux-arm") {
time.Sleep(time.Second)
}
log.Printf("Sending test work.")
work <- builderRev{name: "linux-arm", rev: "c1aee8c825c2179ad4959ebf533bf27c4b774d00"}
log.Printf("Sent test work.")
// Still run findWork but ignore what it does.
ignore := make(chan builderRev)
go func() {
for range ignore {
}
}()
work = ignore
}
if inStaging {
return
}
ticker := time.NewTicker(15 * time.Second)
for {
if err := findWork(work); err != nil {
log.Printf("failed to find new work: %v", err)
}
<-ticker.C
}
}
func findWork(work chan<- builderRev) error {
var bs types.BuildStatus
res, err := http.Get(dashBase() + "?mode=json")
if err != nil {
return err
}
defer res.Body.Close()
if err := json.NewDecoder(res.Body).Decode(&bs); err != nil {
return err
}
if res.StatusCode != 200 {
return fmt.Errorf("unexpected http status %v", res.Status)
}
knownToDashboard := map[string]bool{} // keys are builder
for _, b := range bs.Builders {
knownToDashboard[b] = true
}
var goRevisions []string
seenSubrepo := make(map[string]bool)
for _, br := range bs.Revisions {
awaitSnapshot := false
if br.Repo == "go" {
if len(goRevisions) == 0 {
// First Go revision on page; update repo head.
setRepoHead(br.Repo, br.Revision)
}
goRevisions = append(goRevisions, br.Revision)
} else {
// The dashboard provides only the head revision for
// each sub-repo; store it in subrepoHead for later use.
setRepoHead(br.Repo, br.Revision)
// If this is the first time we've seen this sub-repo
// in this loop, then br.GoRevision is the go repo
// HEAD. To save resources, we only build subrepos
// against HEAD once we have a snapshot.
// The next time we see this sub-repo in this loop, the
// GoRevision is one of the release branches, for which
// we may not have a snapshot (if the release was made
// a long time before this builder came up), so skip
// the snapshot check.
awaitSnapshot = !seenSubrepo[br.Repo]
seenSubrepo[br.Repo] = true
}
if len(br.Results) != len(bs.Builders) {
return errors.New("bogus JSON response from dashboard: results is too long.")
}
for i, res := range br.Results {
if res != "" {
// It's either "ok" or a failure URL.
continue
}
builder := bs.Builders[i]
builderInfo, ok := dashboard.Builders[builder]
if !ok || builderInfo.TryOnly {
// Not managed by the coordinator, or a trybot-only one.
continue
}
if br.Repo != "go" && !builderInfo.BuildSubrepos() {
// This builder can't build subrepos; skip.
continue
}
var rev builderRev
if br.Repo == "go" {
rev = builderRev{
name: bs.Builders[i],
rev: br.Revision,
}
} else {
rev = builderRev{
name: bs.Builders[i],
rev: br.GoRevision,
subName: br.Repo,
subRev: br.Revision,
}
if awaitSnapshot && !rev.snapshotExists() {
continue
}
}
if !isBuilding(rev) {
work <- rev
}
}
}
// And to bootstrap new builders, see if we have any builders
// that the dashboard doesn't know about.
for b, builderInfo := range dashboard.Builders {
if builderInfo.TryOnly || knownToDashboard[b] {
continue
}
for _, rev := range goRevisions {
br := builderRev{name: b, rev: rev}
if !isBuilding(br) {
work <- br
}
}
}
return nil
}
// findTryWorkLoop is a goroutine which loops periodically and queries
// Gerrit for TryBot work.
func findTryWorkLoop() {
if errTryDeps != nil {
return
}
ticker := time.NewTicker(60 * time.Second)
for {
if err := findTryWork(); err != nil {
log.Printf("failed to find trybot work: %v", err)
}
<-ticker.C
}
}
func findTryWork() error {
if inStaging && true {
return nil
}
cis, err := gerritClient.QueryChanges("label:Run-TryBot=1 label:TryBot-Result=0 status:open", gerrit.QueryChangesOpt{
Fields: []string{"CURRENT_REVISION"},
})
if err != nil {
return err
}
if len(cis) == 0 {
return nil
}
statusMu.Lock()
defer statusMu.Unlock()
tryList = make([]tryKey, 0, len(cis))
wanted := map[tryKey]bool{}
for _, ci := range cis {
if ci.ChangeID == "" || ci.CurrentRevision == "" {
log.Printf("Warning: skipping incomplete %#v", ci)
continue
}
if ci.Project == "build" {
// Skip trybot request in build repo.
continue
}
key := tryKey{
Project: ci.Project,
Branch: ci.Branch,
ChangeID: ci.ChangeID,
Commit: ci.CurrentRevision,
Repo: ci.Project,
}
tryList = append(tryList, key)
wanted[key] = true
if _, ok := tries[key]; ok {
// already in progress
continue
}
ts, err := newTrySet(key)
if err != nil {
if err == errHeadUnknown {
continue // benign transient error
}
log.Printf("Error creating trySet for %v: %v", key, err)
continue
}
tries[key] = ts
}
for k, ts := range tries {
if !wanted[k] {
delete(tries, k)
go ts.cancelBuilds()
}
}
return nil
}
type tryKey struct {
Project string // "go", "build", etc
Branch string // master
ChangeID string // I1a27695838409259d1586a0adfa9f92bccf7ceba
Commit string // ecf3dffc81dc21408fb02159af352651882a8383
Repo string // "go"
}
// ChangeTriple returns the Gerrit (project, branch, change-ID) triple
// uniquely identifying this change. Several Gerrit APIs require this
// form of if there are multiple changes with the same Change-ID.
func (k *tryKey) ChangeTriple() string {
return fmt.Sprintf("%s~%s~%s", k.Project, k.Branch, k.ChangeID)
}
// trySet is a the state of a set of builds of different
// configurations, all for the same (Change-ID, Commit) pair. The
// sets which are still wanted (not already submitted or canceled) are
// stored in the global 'tries' map.
type trySet struct {
// immutable
tryKey
// mu guards state and errMsg
// See LOCK ORDER comment above.
mu sync.Mutex
trySetState
errMsg bytes.Buffer
}
type trySetState struct {
remain int
failed []string // build names
builds []*buildStatus
}
func (ts trySetState) clone() trySetState {
return trySetState{
remain: ts.remain,
failed: append([]string(nil), ts.failed...),
builds: append([]*buildStatus(nil), ts.builds...),
}
}
var errHeadUnknown = errors.New("Cannot create trybot set without a known Go head (transient error)")
// newTrySet creates a new trySet group of builders for a given key,
// the (Change-ID, Commit, Repo) tuple.
// It also starts goroutines for each build.
// This will fail if the current Go repo HEAD is unknown.
//
// Must hold statusMu.
func newTrySet(key tryKey) (*trySet, error) {
goHead := getRepoHead("go")
if key.Repo != "go" && goHead == "" {
// We don't know the go HEAD yet (but we will)
// so don't create this trySet yet as we don't
// know which Go revision to build against.
return nil, errHeadUnknown
}
builders := tryBuilders
if key.Repo != "go" {
builders = subTryBuilders
}
log.Printf("Starting new trybot set for %v", key)
ts := &trySet{
tryKey: key,
trySetState: trySetState{
remain: len(builders),
builds: make([]*buildStatus, len(builders)),
},
}
go ts.notifyStarting()
for i, bconf := range builders {
brev := tryKeyToBuilderRev(bconf.Name, key)
bs, err := newBuild(brev)
if err != nil {
log.Printf("can't create build for %q: %v", brev, err)
continue
}
bs.trySet = ts
status[brev] = bs
ts.builds[i] = bs
go bs.start() // acquires statusMu itself, so in a goroutine
go ts.awaitTryBuild(i, bconf, bs)
}
return ts, nil
}
func tryKeyToBuilderRev(builder string, key tryKey) builderRev {
if key.Repo == "go" {
return builderRev{
name: builder,
rev: key.Commit,
}
}
return builderRev{
name: builder,
rev: getRepoHead("go"),
subName: key.Repo,
subRev: key.Commit,
}
}
// state returns a copy of the trySet's state.
func (ts *trySet) state() trySetState {
ts.mu.Lock()
defer ts.mu.Unlock()
return ts.trySetState.clone()
}
// notifyStarting runs in its own goroutine and posts to Gerrit that
// the trybots have started on the user's CL with a link of where to watch.
func (ts *trySet) notifyStarting() {
msg := "TryBots beginning. Status page: http://farmer.golang.org/try?commit=" + ts.Commit[:8]
if ci, err := gerritClient.GetChangeDetail(ts.ChangeTriple()); err == nil {
if len(ci.Messages) == 0 {
log.Printf("No Gerrit comments retrieved on %v", ts.ChangeTriple())
}
for _, cmi := range ci.Messages {
if strings.Contains(cmi.Message, msg) {
// Dup. Don't spam.
return
}
}
} else {
log.Printf("Error getting Gerrit comments on %s: %v", ts.ChangeTriple(), err)
}
// Ignore error. This isn't critical.
gerritClient.SetReview(ts.ChangeTriple(), ts.Commit, gerrit.ReviewInput{Message: msg})
}
// awaitTryBuild runs in its own goroutine and waits for a build in a
// trySet to complete.
//
// If the build fails without getting to the end, it sleeps and
// reschedules it, as long as it's still wanted.
func (ts *trySet) awaitTryBuild(idx int, bconf dashboard.BuildConfig, bs *buildStatus) {
for {
WaitCh:
for {
timeout := time.NewTimer(10 * time.Minute)
select {
case <-bs.ctx.Done():
timeout.Stop()
break WaitCh
case <-timeout.C:
if !ts.wanted() {
// Build was canceled.
return
}
}
}
if bs.hasEvent("done") {
ts.noteBuildComplete(bconf, bs)
return
}
// TODO(bradfitz): rethink this logic. we should only
// start a new build if the old one appears dead or
// hung.
// Sleep a bit and retry.
time.Sleep(30 * time.Second)
if !ts.wanted() {
return
}
brev := tryKeyToBuilderRev(bconf.Name, ts.tryKey)
bs, _ = newBuild(brev)
bs.trySet = ts
go bs.start()
ts.mu.Lock()
ts.builds[idx] = bs
ts.mu.Unlock()
}
}
// wanted reports whether this trySet is still active.
//
// If the commmit has been submitted, or change abandoned, or the
// checkbox unchecked, wanted returns false.
func (ts *trySet) wanted() bool {
statusMu.Lock()
defer statusMu.Unlock()
_, ok := tries[ts.tryKey]
return ok
}
// cancelBuilds run in its own goroutine and cancels this trySet's
// currently-active builds because they're no longer wanted.
func (ts *trySet) cancelBuilds() {
// TODO(bradfitz): implement
}
func (ts *trySet) noteBuildComplete(bconf dashboard.BuildConfig, bs *buildStatus) {
bs.mu.Lock()
succeeded := bs.succeeded
var buildLog string
if !succeeded {