Golang Obj.OptionalInt方法代码示例

func newFromConfig(_ blobserver.Loader, config jsonconfig.Obj) (storage blobserver.Storage, err error) {
	var (
		path        = config.RequiredString("path")
		maxFileSize = config.OptionalInt("maxFileSize", 0)
		indexConf   = config.OptionalObject("metaIndex")
	)
	if err := config.Validate(); err != nil {
		return nil, err
	}
	return newStorage(path, int64(maxFileSize), indexConf)
}

// ServiceFromConfig builds a new Service from configuration.
// Example expected configuration object (all keys are optional) :
// {
//   // command defaults to FFmpegThumbnailer and $uri is replaced by
//   // the real value at runtime.
//   "command": ["/opt/local/bin/ffmpeg", "-i", "$uri", "pipe:1"],
//   // Maximun number of milliseconds for running the thumbnailing subprocess.
//   // A zero or negative timeout means no timeout.
//   "timeout": 2000,
//   // Maximum number of thumbnailing subprocess running at same time.
//   // A zero or negative maxProcs means no limit.
//   "maxProcs": 5
// }
func ServiceFromConfig(conf jsonconfig.Obj) (*Service, error) {
	th := thumbnailerFromConfig(conf)
	timeout := conf.OptionalInt("timeout", 5000)
	maxProc := conf.OptionalInt("maxProcs", 5)

	err := conf.Validate()
	if err != nil {
		return nil, err
	}

	return NewService(th, time.Millisecond*time.Duration(timeout), maxProc), nil
}

func newFromConfig(ld blobserver.Loader, config jsonconfig.Obj) (storage blobserver.Storage, err error) {
	sto := &replicaStorage{
		replicaPrefixes: config.RequiredList("backends"),
		readPrefixes:    config.OptionalList("readBackends"),
	}
	nReplicas := len(sto.replicaPrefixes)
	sto.minWritesForSuccess = config.OptionalInt("minWritesForSuccess", nReplicas)
	if err := config.Validate(); err != nil {
		return nil, err
	}
	if nReplicas == 0 {
		return nil, errors.New("replica: need at least one replica")
	}
	if sto.minWritesForSuccess == 0 {
		sto.minWritesForSuccess = nReplicas
	}
	// readPrefixes defaults to the write prefixes.
	if len(sto.readPrefixes) == 0 {
		sto.readPrefixes = sto.replicaPrefixes
	}

	for _, prefix := range sto.replicaPrefixes {
		s, err := ld.GetStorage(prefix)
		if err != nil {
			// If it's not a storage interface, it might be an http Handler
			// that also supports being a target (e.g. a sync handler).
			h, _ := ld.GetHandler(prefix)
			var ok bool
			if s, ok = h.(blobserver.Storage); !ok {
				return nil, err
			}
		}
		sto.replicas = append(sto.replicas, s)
	}
	for _, prefix := range sto.readPrefixes {
		s, err := ld.GetStorage(prefix)
		if err != nil {
			return nil, err
		}
		sto.readReplicas = append(sto.readReplicas, s)
	}
	return sto, nil
}

func newSyncFromConfig(ld blobserver.Loader, conf jsonconfig.Obj) (http.Handler, error) {
	var (
		from           = conf.RequiredString("from")
		to             = conf.RequiredString("to")
		fullSync       = conf.OptionalBool("fullSyncOnStart", false)
		blockFullSync  = conf.OptionalBool("blockingFullSyncOnStart", false)
		idle           = conf.OptionalBool("idle", false)
		queueConf      = conf.OptionalObject("queue")
		copierPoolSize = conf.OptionalInt("copierPoolSize", 5)
		validate       = conf.OptionalBool("validateOnStart", validateOnStartDefault)
	)
	if err := conf.Validate(); err != nil {
		return nil, err
	}
	if idle {
		return newIdleSyncHandler(from, to), nil
	}
	if len(queueConf) == 0 {
		return nil, errors.New(`Missing required "queue" object`)
	}
	q, err := sorted.NewKeyValue(queueConf)
	if err != nil {
		return nil, err
	}

	isToIndex := false
	fromBs, err := ld.GetStorage(from)
	if err != nil {
		return nil, err
	}
	toBs, err := ld.GetStorage(to)
	if err != nil {
		return nil, err
	}
	if _, ok := fromBs.(*index.Index); !ok {
		if _, ok := toBs.(*index.Index); ok {
			isToIndex = true
		}
	}

	sh := newSyncHandler(from, to, fromBs, toBs, q)
	sh.toIndex = isToIndex
	sh.copierPoolSize = copierPoolSize
	if err := sh.readQueueToMemory(); err != nil {
		return nil, fmt.Errorf("Error reading sync queue to memory: %v", err)
	}

	if fullSync || blockFullSync {
		sh.logf("Doing full sync")
		didFullSync := make(chan bool, 1)
		go func() {
			for {
				n := sh.runSync("pending blobs queue", sh.enumeratePendingBlobs)
				if n > 0 {
					sh.logf("Queue sync copied %d blobs", n)
					continue
				}
				break
			}
			n := sh.runSync("full", blobserverEnumerator(context.TODO(), fromBs))
			sh.logf("Full sync copied %d blobs", n)
			didFullSync <- true
			sh.syncLoop()
		}()
		if blockFullSync {
			sh.logf("Blocking startup, waiting for full sync from %q to %q", from, to)
			<-didFullSync
			sh.logf("Full sync complete.")
		}
	} else {
		go sh.syncLoop()
	}

	if validate {
		go sh.startFullValidation()
	}

	blobserver.GetHub(fromBs).AddReceiveHook(sh.enqueue)
	return sh, nil
}

func uiFromConfig(ld blobserver.Loader, conf jsonconfig.Obj) (h http.Handler, err error) {
	ui := &UIHandler{
		prefix:     ld.MyPrefix(),
		sourceRoot: conf.OptionalString("sourceRoot", ""),
		resizeSem: syncutil.NewSem(int64(conf.OptionalInt("maxResizeBytes",
			constants.DefaultMaxResizeMem))),
	}
	cachePrefix := conf.OptionalString("cache", "")
	scaledImageConf := conf.OptionalObject("scaledImage")
	if err = conf.Validate(); err != nil {
		return
	}

	scaledImageKV, err := newKVOrNil(scaledImageConf)
	if err != nil {
		return nil, fmt.Errorf("in UI handler's scaledImage: %v", err)
	}
	if scaledImageKV != nil && cachePrefix == "" {
		return nil, fmt.Errorf("in UI handler, can't specify scaledImage without cache")
	}
	if cachePrefix != "" {
		bs, err := ld.GetStorage(cachePrefix)
		if err != nil {
			return nil, fmt.Errorf("UI handler's cache of %q error: %v", cachePrefix, err)
		}
		ui.Cache = bs
		ui.thumbMeta = NewThumbMeta(scaledImageKV)
	}

	if ui.sourceRoot == "" {
		ui.sourceRoot = os.Getenv("CAMLI_DEV_CAMLI_ROOT")
		if uistatic.IsAppEngine {
			if _, err = os.Stat(filepath.Join(uistatic.GaeSourceRoot,
				filepath.FromSlash("server/camlistored/ui/index.html"))); err != nil {
				hint := fmt.Sprintf("\"sourceRoot\" was not specified in the config,"+
					" and the default sourceRoot dir %v does not exist or does not contain"+
					" \"server/camlistored/ui/index.html\". devcam appengine can do that for you.",
					uistatic.GaeSourceRoot)
				log.Print(hint)
				return nil, errors.New("No sourceRoot found; UI not available.")
			}
			log.Printf("Using the default \"%v\" as the sourceRoot for AppEngine", uistatic.GaeSourceRoot)
			ui.sourceRoot = uistatic.GaeSourceRoot
		}
		if ui.sourceRoot == "" && uistatic.Files.IsEmpty() {
			ui.sourceRoot, err = osutil.GoPackagePath("camlistore.org")
			if err != nil {
				log.Printf("Warning: server not compiled with linked-in UI resources (HTML, JS, CSS), and camlistore.org not found in GOPATH.")
			} else {
				log.Printf("Using UI resources (HTML, JS, CSS) from disk, under %v", ui.sourceRoot)
			}
		}
	}
	if ui.sourceRoot != "" {
		ui.uiDir = filepath.Join(ui.sourceRoot, filepath.FromSlash("server/camlistored/ui"))
		// Ignore any fileembed files:
		Files = &fileembed.Files{
			DirFallback: filepath.Join(ui.sourceRoot, filepath.FromSlash("pkg/server")),
		}
		uistatic.Files = &fileembed.Files{
			DirFallback: ui.uiDir,
			Listable:    true,
			// In dev_appserver, allow edit-and-reload without
			// restarting. In production, though, it's faster to just
			// slurp it in.
			SlurpToMemory: uistatic.IsProdAppEngine,
		}
	}

	ui.closureHandler, err = ui.makeClosureHandler(ui.sourceRoot)
	if err != nil {
		return nil, fmt.Errorf(`Invalid "sourceRoot" value of %q: %v"`, ui.sourceRoot, err)
	}

	if ui.sourceRoot != "" {
		ui.fileReactHandler, err = makeFileServer(ui.sourceRoot, filepath.Join(vendorEmbed, "react"), "react.js")
		if err != nil {
			return nil, fmt.Errorf("Could not make react handler: %s", err)
		}
		ui.fileGlitchHandler, err = makeFileServer(ui.sourceRoot, filepath.Join(vendorEmbed, "glitch"), "npc_piggy__x1_walk_png_1354829432.png")
		if err != nil {
			return nil, fmt.Errorf("Could not make glitch handler: %s", err)
		}
		ui.fileFontawesomeHandler, err = makeFileServer(ui.sourceRoot, filepath.Join(vendorEmbed, "fontawesome"), "css/font-awesome.css")
		if err != nil {
			return nil, fmt.Errorf("Could not make fontawesome handler: %s", err)
		}
		ui.fileLessHandler, err = makeFileServer(ui.sourceRoot, filepath.Join(vendorEmbed, "less"), "less.js")
		if err != nil {
			return nil, fmt.Errorf("Could not make less handler: %s", err)
		}
	}

	rootPrefix, _, err := ld.FindHandlerByType("root")
	if err != nil {
		return nil, errors.New("No root handler configured, which is necessary for the ui handler")
	}
	if h, err := ld.GetHandler(rootPrefix); err == nil {
		ui.root = h.(*RootHandler)
		ui.root.registerUIHandler(ui)
//.........这里部分代码省略.........