// appConfig keeps on trying to fetch the extra config from the app handler. If
// it doesn't succed after an hour has passed, the program exits.
func appConfig() (*config, error) {
configURL := os.Getenv("CAMLI_APP_CONFIG_URL")
if configURL == "" {
return nil, fmt.Errorf("Publisher application needs a CAMLI_APP_CONFIG_URL env var")
}
cl, err := app.Client()
if err != nil {
return nil, fmt.Errorf("could not get a client to fetch extra config: %v", err)
}
conf := &config{}
pause := time.Second
giveupTime := time.Now().Add(time.Hour)
for {
err := cl.GetJSON(configURL, conf)
if err == nil {
break
}
if time.Now().After(giveupTime) {
logger.Fatalf("Giving up on starting: could not get app config at %v: %v", configURL, err)
}
logger.Printf("could not get app config at %v: %v. Will retry in a while.", configURL, err)
time.Sleep(pause)
pause *= 2
}
return conf, nil
}
func appConfig() *config {
configURL := os.Getenv("CAMLI_APP_CONFIG_URL")
if configURL == "" {
log.Fatalf("Hello application needs a CAMLI_APP_CONFIG_URL env var")
}
cl, err := app.Client()
if err != nil {
log.Fatalf("could not get a client to fetch extra config: %v", err)
}
conf := &config{}
if err := cl.GetJSON(configURL, conf); err != nil {
log.Fatalf("could not get app config at %v: %v", configURL, err)
}
return conf
}
func newPublishHandler(conf *config) *publishHandler {
cl, err := app.Client()
if err != nil {
logger.Fatalf("could not get a client for the publish handler %v", err)
}
if conf.RootName == "" {
logger.Fatal("camliRoot not found in the app configuration")
}
maxResizeBytes := conf.MaxResizeBytes
if maxResizeBytes == 0 {
maxResizeBytes = constants.DefaultMaxResizeMem
}
var CSSFiles, JSDeps []string
if conf.SourceRoot != "" {
appRoot := filepath.Join(conf.SourceRoot, "app", "publisher")
Files = &fileembed.Files{
DirFallback: appRoot,
}
// TODO(mpl): Can I readdir by listing with "/" on Files, even with DirFallBack?
// Apparently not, but retry later.
dir, err := os.Open(appRoot)
if err != nil {
logger.Fatal(err)
}
defer dir.Close()
names, err := dir.Readdirnames(-1)
if err != nil {
logger.Fatal(err)
}
for _, v := range names {
if strings.HasSuffix(v, ".css") {
CSSFiles = append(CSSFiles, v)
continue
}
// TODO(mpl): document or fix (use a map?) the ordering
// problem: i.e. jquery.js must be sourced before
// publisher.js. For now, just cheat by sorting the
// slice.
if strings.HasSuffix(v, ".js") {
JSDeps = append(JSDeps, v)
}
}
sort.Strings(JSDeps)
} else {
Files.Listable = true
dir, err := Files.Open("/")
if err != nil {
logger.Fatal(err)
}
defer dir.Close()
fis, err := dir.Readdir(-1)
if err != nil {
logger.Fatal(err)
}
for _, v := range fis {
name := v.Name()
if strings.HasSuffix(name, ".css") {
CSSFiles = append(CSSFiles, name)
continue
}
if strings.HasSuffix(name, ".js") {
JSDeps = append(JSDeps, name)
}
}
sort.Strings(JSDeps)
}
// TODO(mpl): add all htmls found in Files to the template if none specified?
if conf.GoTemplate == "" {
logger.Fatal("a go template is required in the app configuration")
}
goTemplate, err := goTemplate(Files, conf.GoTemplate)
if err != nil {
logger.Fatal(err)
}
var cache blobserver.Storage
var thumbMeta *server.ThumbMeta
if conf.CacheRoot != "" {
cache, err = localdisk.New(conf.CacheRoot)
if err != nil {
logger.Fatalf("Could not create localdisk cache: %v", err)
}
thumbsCacheDir := filepath.Join(os.TempDir(), "camli-publisher-cache")
if err := os.MkdirAll(thumbsCacheDir, 0700); err != nil {
logger.Fatalf("Could not create cache dir %s for %v publisher: %v", thumbsCacheDir, conf.RootName, err)
}
kv, err := sorted.NewKeyValue(map[string]interface{}{
"type": "kv",
"file": filepath.Join(thumbsCacheDir, conf.RootName+"-thumbnails.kv"),
})
if err != nil {
logger.Fatalf("Could not create kv for %v's thumbs cache: %v", conf.RootName, err)
}
thumbMeta = server.NewThumbMeta(kv)
}
return &publishHandler{
rootName: conf.RootName,
cl: cl,
resizeSem: syncutil.NewSem(maxResizeBytes),
staticFiles: Files,
goTemplate: goTemplate,
CSSFiles: CSSFiles,
JSDeps: JSDeps,
describedCache: make(map[string]*search.DescribedBlob),
cache: cache,
thumbMeta: thumbMeta,
}
}