mirror of https://github.com/perkeep/perkeep.git
109 lines
3.0 KiB
Go
109 lines
3.0 KiB
Go
// +build appengine
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/*
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Copyright 2011 Google Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package appengine
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import (
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"fmt"
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"net/http"
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"sync"
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"appengine"
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"camlistore.org/pkg/blobserver" // storage interface definition
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_ "camlistore.org/pkg/blobserver/cond"
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_ "camlistore.org/pkg/blobserver/replica"
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_ "camlistore.org/pkg/blobserver/shard"
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_ "camlistore.org/pkg/server" // handlers: UI, publish, thumbnailing, etc
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"camlistore.org/pkg/serverconfig" // wiring up the world from a JSON description
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// TODO(bradfitz): uncomment these config setup
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// Both require an App Engine context to make HTTP requests too.
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//_ "camlistore.org/pkg/blobserver/remote"
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//_ "camlistore.org/pkg/blobserver/s3"
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)
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// lazyInit is our root handler for App Engine. We don't have an App Engine
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// context until the first request and we need that context to figure out
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// our serving URL. So we use this to defer setting up our environment until
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// the first request.
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type lazyInit struct {
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mu sync.Mutex
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ready bool
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mux *http.ServeMux
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}
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func (li *lazyInit) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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c := appengine.NewContext(r)
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ctxPool.HandlerBegin(c)
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defer ctxPool.HandlerEnd(c)
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li.mu.Lock()
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if !li.ready {
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li.ready = realInit(w, r)
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}
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li.mu.Unlock()
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if li.ready {
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li.mux.ServeHTTP(w, r)
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}
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}
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var ctxPool ContextPool
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var root = new(lazyInit)
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func init() {
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// TODO(bradfitz): rename some of this to be consistent
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blobserver.RegisterStorageConstructor("appengine", blobserver.StorageConstructor(newFromConfig))
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blobserver.RegisterStorageConstructor("aeindex", blobserver.StorageConstructor(indexFromConfig))
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http.Handle("/", root)
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}
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func realInit(w http.ResponseWriter, r *http.Request) bool {
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ctx := appengine.NewContext(r)
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errf := func(format string, args ...interface{}) bool {
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ctx.Errorf("In init: "+format, args...)
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http.Error(w, fmt.Sprintf(format, args...), 500)
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return false
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}
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config, err := serverconfig.Load("./config.json")
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if err != nil {
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return errf("Could not load server config: %v", err)
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}
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// Update the config to use the URL path derived from the first App Engine request.
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// TODO(bslatkin): Support hostnames that aren't x.appspot.com
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scheme := "http"
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if r.TLS != nil {
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scheme = "https"
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}
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baseURL := fmt.Sprintf("%s://%s/", scheme, appengine.DefaultVersionHostname(ctx))
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ctx.Infof("baseurl = %q", baseURL)
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root.mux = http.NewServeMux()
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err = config.InstallHandlers(root.mux, baseURL, r)
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if err != nil {
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return errf("Error installing handlers: %v", err)
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}
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return true
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}
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