84 lines
2.3 KiB
Go
84 lines
2.3 KiB
Go
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// Copyright 2011 Google Inc. All rights reserved.
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// Use of this source code is governed by the Apache 2.0
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// license that can be found in the LICENSE file.
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/*
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Package channel implements the server side of App Engine's Channel API.
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Create creates a new channel associated with the given clientID,
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which must be unique to the client that will use the returned token.
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token, err := channel.Create(c, "player1")
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if err != nil {
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// handle error
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}
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// return token to the client in an HTTP response
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Send sends a message to the client over the channel identified by clientID.
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channel.Send(c, "player1", "Game over!")
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*/
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package channel
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import (
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"encoding/json"
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"golang.org/x/net/context"
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"google.golang.org/appengine"
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"google.golang.org/appengine/internal"
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basepb "google.golang.org/appengine/internal/base"
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pb "google.golang.org/appengine/internal/channel"
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)
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// Create creates a channel and returns a token for use by the client.
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// The clientID is an application-provided string used to identify the client.
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func Create(c context.Context, clientID string) (token string, err error) {
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req := &pb.CreateChannelRequest{
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ApplicationKey: &clientID,
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}
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resp := &pb.CreateChannelResponse{}
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err = internal.Call(c, service, "CreateChannel", req, resp)
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token = resp.GetToken()
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return token, remapError(err)
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}
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// Send sends a message on the channel associated with clientID.
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func Send(c context.Context, clientID, message string) error {
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req := &pb.SendMessageRequest{
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ApplicationKey: &clientID,
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Message: &message,
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}
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resp := &basepb.VoidProto{}
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return remapError(internal.Call(c, service, "SendChannelMessage", req, resp))
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}
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// SendJSON is a helper function that sends a JSON-encoded value
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// on the channel associated with clientID.
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func SendJSON(c context.Context, clientID string, value interface{}) error {
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m, err := json.Marshal(value)
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if err != nil {
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return err
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}
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return Send(c, clientID, string(m))
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}
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// remapError fixes any APIError referencing "xmpp" into one referencing "channel".
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func remapError(err error) error {
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if e, ok := err.(*internal.APIError); ok {
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if e.Service == "xmpp" {
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e.Service = "channel"
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}
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}
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return err
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}
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var service = "xmpp" // prod
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func init() {
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if appengine.IsDevAppServer() {
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service = "channel" // dev
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}
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internal.RegisterErrorCodeMap("channel", pb.ChannelServiceError_ErrorCode_name)
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}
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