devapp/server.go - build - Git at Google

 // Copyright 2017 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.

 package main

 import (
 	"compress/gzip"
 	"context"
 	"fmt"
 	"html/template"
 	"log"
 	"math/rand"
 	"net/http"
 	"path"
 	"strconv"
 	"strings"
 	"sync"
 	"time"

 	"golang.org/x/build/devapp/owners"
 	"golang.org/x/build/maintner"
 	"golang.org/x/build/maintner/godata"
 )

 // A server is an http.Handler that serves content within staticDir at root and
 // the dynamically-generated dashboards at their respective endpoints.
 type server struct {
 	mux         *http.ServeMux
 	staticDir   string
 	templateDir string
 	reloadTmpls bool

 	cMu              sync.RWMutex // Used to protect the fields below.
 	corpus           *maintner.Corpus
 	repo             *maintner.GitHubRepo    // The golang/go repo.
 	proj             *maintner.GerritProject // The go.googlesource.com/go project.
 	helpWantedIssues []issueData
 	data             pageData

 	// GopherCon-specific fields. Must still hold cMu when reading/writing these.
 	userMapping map[int]*maintner.GitHubUser // Gerrit Owner ID => GitHub user
 	activities  []activity                   // All contribution activities
 	totalPoints int
 }

 type issueData struct {
 	id          int32
 	titlePrefix string
 }

 type pageData struct {
 	release releaseData
 	reviews reviewsData
 	stats   statsData
 }

 func newServer(mux *http.ServeMux, staticDir, templateDir string, reloadTmpls bool) *server {
 	s := &server{
 		mux:         mux,
 		staticDir:   staticDir,
 		templateDir: templateDir,
 		reloadTmpls: reloadTmpls,
 		userMapping: map[int]*maintner.GitHubUser{},
 	}
 	s.mux.Handle("/", http.FileServer(http.Dir(s.staticDir)))
 	s.mux.HandleFunc("/favicon.ico", s.handleFavicon)
 	s.mux.HandleFunc("/release", s.withTemplate("/release.tmpl", s.handleRelease))
 	s.mux.HandleFunc("/reviews", s.withTemplate("/reviews.tmpl", s.handleReviews))
 	s.mux.HandleFunc("/stats", s.withTemplate("/stats.tmpl", s.handleStats))
 	s.mux.HandleFunc("/dir/", handleDirRedirect)
 	s.mux.HandleFunc("/owners", owners.Handler)
 	s.mux.Handle("/owners/", http.RedirectHandler("/owners", http.StatusPermanentRedirect)) // TODO: remove after clients updated to use URL without trailing slash
 	for _, p := range []string{"/imfeelinghelpful", "/imfeelinglucky"} {
 		s.mux.HandleFunc(p, s.handleRandomHelpWantedIssue)
 	}
 	s.mux.HandleFunc("/_/activities", s.handleActivities)
 	return s
 }

 func (s *server) withTemplate(tmpl string, fn func(*template.Template, http.ResponseWriter, *http.Request)) http.HandlerFunc {
 	t := template.Must(template.ParseFiles(path.Join(s.templateDir, tmpl)))
 	return func(w http.ResponseWriter, r *http.Request) {
 		if s.reloadTmpls {
 			t = template.Must(template.ParseFiles(path.Join(s.templateDir, tmpl)))
 		}
 		fn(t, w, r)
 	}
 }

 // initCorpus fetches a full maintner corpus, overwriting any existing data.
 func (s *server) initCorpus(ctx context.Context) error {
 	s.cMu.Lock()
 	defer s.cMu.Unlock()
 	corpus, err := godata.Get(ctx)
 	if err != nil {
 		return fmt.Errorf("godata.Get: %v", err)
 	}
 	s.corpus = corpus
 	s.repo = s.corpus.GitHub().Repo("golang", "go")
 	if s.repo == nil {
 		return fmt.Errorf(`s.corpus.GitHub().Repo("golang", "go") = nil`)
 	}
 	s.proj = s.corpus.Gerrit().Project("go.googlesource.com", "go")
 	if s.proj == nil {
 		return fmt.Errorf(`s.corpus.Gerrit().Project("go.googlesource.com", "go") = nil`)
 	}
 	return nil
 }

 // corpusUpdateLoop continuously updates the server’s corpus until ctx’s Done
 // channel is closed.
 func (s *server) corpusUpdateLoop(ctx context.Context) {
 	log.Println("Starting corpus update loop ...")
 	for {
 		log.Println("Updating help wanted issues ...")
 		s.updateHelpWantedIssues()
 		log.Println("Updating activities ...")
 		s.updateActivities()
 		s.cMu.Lock()
 		s.data.release.dirty = true
 		s.data.reviews.dirty = true
 		s.data.stats.dirty = true
 		s.cMu.Unlock()
 		err := s.corpus.UpdateWithLocker(ctx, &s.cMu)
 		if err != nil {
 			if err == maintner.ErrSplit {
 				log.Println("Corpus out of sync. Re-fetching corpus.")
 				s.initCorpus(ctx)
 			} else {
 				log.Printf("corpus.Update: %v; sleeping 15s", err)
 				time.Sleep(15 * time.Second)
 				continue
 			}
 		}

 		select {
 		case <-ctx.Done():
 			return
 		default:
 			continue
 		}
 	}
 }

 const (
 	issuesURLBase = "https://golang.org/issue/"

 	labelHelpWantedID = 150880243
 )

 func (s *server) updateHelpWantedIssues() {
 	s.cMu.Lock()
 	defer s.cMu.Unlock()

 	var issues []issueData
 	s.repo.ForeachIssue(func(i *maintner.GitHubIssue) error {
 		if i.Closed {
 			return nil
 		}
 		if i.HasLabelID(labelHelpWantedID) {
 			prefix := strings.SplitN(i.Title, ":", 2)[0]
 			issues = append(issues, issueData{id: i.Number, titlePrefix: prefix})
 		}
 		return nil
 	})
 	s.helpWantedIssues = issues
 }

 func (s *server) handleRandomHelpWantedIssue(w http.ResponseWriter, r *http.Request) {
 	s.cMu.RLock()
 	defer s.cMu.RUnlock()
 	if len(s.helpWantedIssues) == 0 {
 		http.Redirect(w, r, issuesURLBase, http.StatusSeeOther)
 		return
 	}
 	pkgs := r.URL.Query().Get("pkg")
 	var rid int32
 	if pkgs == "" {
 		rid = s.helpWantedIssues[rand.Intn(len(s.helpWantedIssues))].id
 	} else {
 		filtered := s.filteredHelpWantedIssues(strings.Split(pkgs, ",")...)
 		if len(filtered) == 0 {
 			http.Redirect(w, r, issuesURLBase, http.StatusSeeOther)
 			return
 		}
 		rid = filtered[rand.Intn(len(filtered))].id
 	}
 	http.Redirect(w, r, issuesURLBase+strconv.Itoa(int(rid)), http.StatusSeeOther)
 }

 func (s *server) filteredHelpWantedIssues(pkgs ...string) []issueData {
 	var issues []issueData
 	for _, i := range s.helpWantedIssues {
 		for _, p := range pkgs {
 			if strings.HasPrefix(i.titlePrefix, p) {
 				issues = append(issues, i)
 				break
 			}
 		}
 	}
 	return issues
 }

 func (s *server) handleFavicon(w http.ResponseWriter, r *http.Request) {
 	// Need to specify content type for consistent tests, without this it's
 	// determined from mime.types on the box the test is running on
 	w.Header().Set("Content-Type", "image/x-icon")
 	http.ServeFile(w, r, path.Join(s.staticDir, "/favicon.ico"))
 }

 // ServeHTTP satisfies the http.Handler interface.
 func (s *server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	if r.TLS != nil {
 		w.Header().Set("Strict-Transport-Security", "max-age=31536000; preload")
 	}
 	if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
 		w.Header().Set("Content-Encoding", "gzip")
 		gz := gzip.NewWriter(w)
 		defer gz.Close()
 		gzw := &gzipResponseWriter{Writer: gz, ResponseWriter: w}
 		s.mux.ServeHTTP(gzw, r)
 		return
 	}
 	s.mux.ServeHTTP(w, r)
 }

 // handleDirRedirect accepts requests of the form:
 //
 //	/dir/REPO/some/dir/
 //
 // And redirects them to either:
 //
 //	https://github.com/golang/REPO/tree/master/some/dir/
 //
 // or:
 //
 //	https://go.googlesource.com/REPO/+/master/some/dir/
 //
 // ... depending on the Referer. This is so we can make links
 // in Markdown docs that are clickable on both GitHub and
 // in the go.googlesource.com viewer. If detection fails, we
 // default to GitHub.
 func handleDirRedirect(w http.ResponseWriter, r *http.Request) {
 	useGoog := strings.Contains(r.Referer(), "googlesource.com")
 	path := r.URL.Path
 	if !strings.HasPrefix(path, "/dir/") {
 		http.Error(w, "bad mux", http.StatusInternalServerError)
 		return
 	}
 	path = strings.TrimPrefix(path, "/dir/")
 	// path is now "REPO/some/dir/"
 	var repo string
 	slash := strings.IndexByte(path, '/')
 	if slash == -1 {
 		repo, path = path, ""
 	} else {
 		repo, path = path[:slash], path[slash+1:]
 	}
 	path = strings.TrimSuffix(path, "/")
 	var target string
 	if useGoog {
 		target = fmt.Sprintf("https://go.googlesource.com/%s/+/master/%s", repo, path)
 	} else {
 		target = fmt.Sprintf("https://github.com/golang/%s/tree/master/%s", repo, path)
 	}
 	http.Redirect(w, r, target, http.StatusFound)
 }
	// Copyright 2017 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.

	package main

	import (
	"compress/gzip"
	"context"
	"fmt"
	"html/template"
	"log"
	"math/rand"
	"net/http"
	"path"
	"strconv"
	"strings"
	"sync"
	"time"

	"golang.org/x/build/devapp/owners"
	"golang.org/x/build/maintner"
	"golang.org/x/build/maintner/godata"
	)

	// A server is an http.Handler that serves content within staticDir at root and
	// the dynamically-generated dashboards at their respective endpoints.
	type server struct {
	mux *http.ServeMux
	staticDir string
	templateDir string
	reloadTmpls bool

	cMu sync.RWMutex // Used to protect the fields below.
	corpus *maintner.Corpus
	repo *maintner.GitHubRepo // The golang/go repo.
	proj *maintner.GerritProject // The go.googlesource.com/go project.
	helpWantedIssues []issueData
	data pageData

	// GopherCon-specific fields. Must still hold cMu when reading/writing these.
	userMapping map[int]*maintner.GitHubUser // Gerrit Owner ID => GitHub user
	activities []activity // All contribution activities
	totalPoints int
	}

	type issueData struct {
	id int32
	titlePrefix string
	}

	type pageData struct {
	release releaseData
	reviews reviewsData
	stats statsData
	}

	func newServer(mux http.ServeMux, staticDir, templateDir string, reloadTmpls bool) server {
	s := &server{
	mux: mux,
	staticDir: staticDir,
	templateDir: templateDir,
	reloadTmpls: reloadTmpls,
	userMapping: map[int]*maintner.GitHubUser{},
	}
	s.mux.Handle("/", http.FileServer(http.Dir(s.staticDir)))
	s.mux.HandleFunc("/favicon.ico", s.handleFavicon)
	s.mux.HandleFunc("/release", s.withTemplate("/release.tmpl", s.handleRelease))
	s.mux.HandleFunc("/reviews", s.withTemplate("/reviews.tmpl", s.handleReviews))
	s.mux.HandleFunc("/stats", s.withTemplate("/stats.tmpl", s.handleStats))
	s.mux.HandleFunc("/dir/", handleDirRedirect)
	s.mux.HandleFunc("/owners", owners.Handler)
	s.mux.Handle("/owners/", http.RedirectHandler("/owners", http.StatusPermanentRedirect)) // TODO: remove after clients updated to use URL without trailing slash
	for _, p := range []string{"/imfeelinghelpful", "/imfeelinglucky"} {
	s.mux.HandleFunc(p, s.handleRandomHelpWantedIssue)
	}
	s.mux.HandleFunc("/_/activities", s.handleActivities)
	return s
	}

	func (s server) withTemplate(tmpl string, fn func(template.Template, http.ResponseWriter, *http.Request)) http.HandlerFunc {
	t := template.Must(template.ParseFiles(path.Join(s.templateDir, tmpl)))
	return func(w http.ResponseWriter, r *http.Request) {
	if s.reloadTmpls {
	t = template.Must(template.ParseFiles(path.Join(s.templateDir, tmpl)))
	}
	fn(t, w, r)
	}
	}

	// initCorpus fetches a full maintner corpus, overwriting any existing data.
	func (s *server) initCorpus(ctx context.Context) error {
	s.cMu.Lock()
	defer s.cMu.Unlock()
	corpus, err := godata.Get(ctx)
	if err != nil {
	return fmt.Errorf("godata.Get: %v", err)
	}
	s.corpus = corpus
	s.repo = s.corpus.GitHub().Repo("golang", "go")
	if s.repo == nil {
	return fmt.Errorf(`s.corpus.GitHub().Repo("golang", "go") = nil`)
	}
	s.proj = s.corpus.Gerrit().Project("go.googlesource.com", "go")
	if s.proj == nil {
	return fmt.Errorf(`s.corpus.Gerrit().Project("go.googlesource.com", "go") = nil`)
	}
	return nil
	}

	// corpusUpdateLoop continuously updates the server’s corpus until ctx’s Done
	// channel is closed.
	func (s *server) corpusUpdateLoop(ctx context.Context) {
	log.Println("Starting corpus update loop ...")
	for {
	log.Println("Updating help wanted issues ...")
	s.updateHelpWantedIssues()
	log.Println("Updating activities ...")
	s.updateActivities()
	s.cMu.Lock()
	s.data.release.dirty = true
	s.data.reviews.dirty = true
	s.data.stats.dirty = true
	s.cMu.Unlock()
	err := s.corpus.UpdateWithLocker(ctx, &s.cMu)
	if err != nil {
	if err == maintner.ErrSplit {
	log.Println("Corpus out of sync. Re-fetching corpus.")
	s.initCorpus(ctx)
	} else {
	log.Printf("corpus.Update: %v; sleeping 15s", err)
	time.Sleep(15 * time.Second)
	continue
	}
	}

	select {
	case <-ctx.Done():
	return
	default:
	continue
	}
	}
	}

	const (
	issuesURLBase = "https://golang.org/issue/"

	labelHelpWantedID = 150880243
	)

	func (s *server) updateHelpWantedIssues() {
	s.cMu.Lock()
	defer s.cMu.Unlock()

	var issues []issueData
	s.repo.ForeachIssue(func(i *maintner.GitHubIssue) error {
	if i.Closed {
	return nil
	}
	if i.HasLabelID(labelHelpWantedID) {
	prefix := strings.SplitN(i.Title, ":", 2)[0]
	issues = append(issues, issueData{id: i.Number, titlePrefix: prefix})
	}
	return nil
	})
	s.helpWantedIssues = issues
	}

	func (s server) handleRandomHelpWantedIssue(w http.ResponseWriter, r http.Request) {
	s.cMu.RLock()
	defer s.cMu.RUnlock()
	if len(s.helpWantedIssues) == 0 {
	http.Redirect(w, r, issuesURLBase, http.StatusSeeOther)
	return
	}
	pkgs := r.URL.Query().Get("pkg")
	var rid int32
	if pkgs == "" {
	rid = s.helpWantedIssues[rand.Intn(len(s.helpWantedIssues))].id
	} else {
	filtered := s.filteredHelpWantedIssues(strings.Split(pkgs, ",")...)
	if len(filtered) == 0 {
	http.Redirect(w, r, issuesURLBase, http.StatusSeeOther)
	return
	}
	rid = filtered[rand.Intn(len(filtered))].id
	}
	http.Redirect(w, r, issuesURLBase+strconv.Itoa(int(rid)), http.StatusSeeOther)
	}

	func (s *server) filteredHelpWantedIssues(pkgs ...string) []issueData {
	var issues []issueData
	for _, i := range s.helpWantedIssues {
	for _, p := range pkgs {
	if strings.HasPrefix(i.titlePrefix, p) {
	issues = append(issues, i)
	break
	}
	}
	}
	return issues
	}

	func (s server) handleFavicon(w http.ResponseWriter, r http.Request) {
	// Need to specify content type for consistent tests, without this it's
	// determined from mime.types on the box the test is running on
	w.Header().Set("Content-Type", "image/x-icon")
	http.ServeFile(w, r, path.Join(s.staticDir, "/favicon.ico"))
	}

	// ServeHTTP satisfies the http.Handler interface.
	func (s server) ServeHTTP(w http.ResponseWriter, r http.Request) {
	if r.TLS != nil {
	w.Header().Set("Strict-Transport-Security", "max-age=31536000; preload")
	}
	if strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
	w.Header().Set("Content-Encoding", "gzip")
	gz := gzip.NewWriter(w)
	defer gz.Close()
	gzw := &gzipResponseWriter{Writer: gz, ResponseWriter: w}
	s.mux.ServeHTTP(gzw, r)
	return
	}
	s.mux.ServeHTTP(w, r)
	}

	// handleDirRedirect accepts requests of the form:
	//
	// /dir/REPO/some/dir/
	//
	// And redirects them to either:
	//
	// https://github.com/golang/REPO/tree/master/some/dir/
	//
	// or:
	//
	// https://go.googlesource.com/REPO/+/master/some/dir/
	//
	// ... depending on the Referer. This is so we can make links
	// in Markdown docs that are clickable on both GitHub and
	// in the go.googlesource.com viewer. If detection fails, we
	// default to GitHub.
	func handleDirRedirect(w http.ResponseWriter, r *http.Request) {
	useGoog := strings.Contains(r.Referer(), "googlesource.com")
	path := r.URL.Path
	if !strings.HasPrefix(path, "/dir/") {
	http.Error(w, "bad mux", http.StatusInternalServerError)
	return
	}
	path = strings.TrimPrefix(path, "/dir/")
	// path is now "REPO/some/dir/"
	var repo string
	slash := strings.IndexByte(path, '/')
	if slash == -1 {
	repo, path = path, ""
	} else {
	repo, path = path[:slash], path[slash+1:]
	}
	path = strings.TrimSuffix(path, "/")
	var target string
	if useGoog {
	target = fmt.Sprintf("https://go.googlesource.com/%s/+/master/%s", repo, path)
	} else {
	target = fmt.Sprintf("https://github.com/golang/%s/tree/master/%s", repo, path)
	}
	http.Redirect(w, r, target, http.StatusFound)
	}