// ListenAddress returns the host:[port] network address, derived from the environment,
// that the application should listen on.
func ListenAddress() (string, error) {
baseURL := os.Getenv("CAMLI_APP_BACKEND_URL")
if baseURL == "" {
return "", errors.New("CAMLI_APP_BACKEND_URL is undefined")
}
return netutil.HostPort(baseURL)
}
// gceDeployHandler conditionally returns an http.Handler for a GCE launcher,
// configured to run at /prefix/ (the trailing slash can be omitted).
// If CAMLI_GCE_CLIENTID is not set, the launcher-config.json file, if present,
// is used instead of environment variables to initialize the launcher. If a
// launcher isn't enabled, gceDeployHandler returns nil. If another error occurs,
// log.Fatal is called.
func gceDeployHandler(prefix string) http.Handler {
hostPort, err := netutil.HostPort("https://" + *httpsAddr)
if err != nil {
hostPort = "camlistore.org:443"
}
var gceh http.Handler
if e := os.Getenv("CAMLI_GCE_CLIENTID"); e != "" {
gceh, err = gce.NewDeployHandler(hostPort, prefix)
} else {
config := filepath.Join(*root, "launcher-config.json")
if _, err := os.Stat(config); err != nil {
if os.IsNotExist(err) {
return nil
}
log.Fatalf("Could not stat launcher-config.json: %v", err)
}
gceh, err = gce.NewDeployHandlerFromConfig(hostPort, prefix, config)
}
if err != nil {
log.Fatalf("Error initializing gce deploy handler: %v", err)
}
pageBytes, err := ioutil.ReadFile(filepath.Join(*root, "tmpl", "page.html"))
if err != nil {
log.Fatalf("Error initializing gce deploy handler: %v", err)
}
if err := gceh.(*gce.DeployHandler).AddTemplateTheme(string(pageBytes)); err != nil {
log.Fatalf("Error initializing gce deploy handler: %v", err)
}
log.Printf("Starting Camlistore launcher on https://%s%s", hostPort, prefix)
return gceh
}
// certHostname figures out the name to use for the TLS certificates, using baseURL
// and falling back to the listen address if baseURL is empty or invalid.
func certHostname(listen, baseURL string) (string, error) {
hostPort, err := netutil.HostPort(baseURL)
if err != nil {
hostPort = listen
}
hostname, _, err := net.SplitHostPort(hostPort)
if err != nil {
return "", fmt.Errorf("failed to find hostname for cert from address %q: %v", hostPort, err)
}
return hostname, nil
}
// Main sends on up when it's running, and shuts down when it receives from down.
func Main(up chan<- struct{}, down <-chan struct{}) {
flag.Parse()
if *flagVersion {
fmt.Fprintf(os.Stderr, "camlistored version: %s\nGo version: %s (%s/%s)\n",
buildinfo.Version(), runtime.Version(), runtime.GOOS, runtime.GOARCH)
return
}
if legalprint.MaybePrint(os.Stderr) {
return
}
if env.OnGCE() {
log.SetOutput(gce.LogWriter())
}
if *flagReindex {
index.SetImpendingReindex()
}
log.Printf("Starting camlistored version %s; Go %s (%s/%s)", buildinfo.Version(), runtime.Version(),
runtime.GOOS, runtime.GOARCH)
shutdownc := make(chan io.Closer, 1) // receives io.Closer to cleanly shut down
go handleSignals(shutdownc)
// In case we're running in a Docker container with no
// filesytem from which to load the root CAs, this
// conditionally installs a static set if necessary. We do
// this before we load the config file, which might come from
// an https URL.
httputil.InstallCerts()
config, isNewConfig, err := loadConfig(*flagConfigFile)
if err != nil {
exitf("Error loading config file: %v", err)
}
ws := webserver.New()
listen, baseURL := listenAndBaseURL(config)
hostname, err := certHostname(listen, baseURL)
if err != nil {
exitf("Bad baseURL or listen address: %v", err)
}
setupTLS(ws, config, hostname)
err = ws.Listen(listen)
if err != nil {
exitf("Listen: %v", err)
}
if baseURL == "" {
baseURL = ws.ListenURL()
}
shutdownCloser, err := config.InstallHandlers(ws, baseURL, *flagReindex, nil)
if err != nil {
exitf("Error parsing config: %v", err)
}
shutdownc <- shutdownCloser
urlToOpen := baseURL
if !isNewConfig {
// user may like to configure the server at the initial startup,
// open UI if this is not the first run with a new config file.
urlToOpen += config.UIPath
}
if *flagOpenBrowser {
go osutil.OpenURL(urlToOpen)
}
go ws.Serve()
if flagPollParent {
osutil.DieOnParentDeath()
}
if err := config.StartApps(); err != nil {
exitf("StartApps: %v", err)
}
for appName, appURL := range config.AppURL() {
addr, err := netutil.HostPort(appURL)
if err != nil {
log.Printf("Could not get app %v address: %v", appName, err)
continue
}
if err := netutil.AwaitReachable(addr, 5*time.Second); err != nil {
log.Printf("Could not reach app %v: %v", appName, err)
}
}
log.Printf("Available on %s", urlToOpen)
if env.OnGCE() && strings.HasPrefix(baseURL, "https://") {
go redirectFromHTTP(baseURL)
}
// Block forever, except during tests.
up <- struct{}{}
<-down
osExit(0)
}