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feat: switch glide to govendor. (#186)

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* feat: switch glide to govendor.

* fix: testing
This commit is contained in:
Bo-Yi Wu
2017-02-19 15:04:00 +08:00
committed by GitHub
parent 3f4485edf7
commit 23bd0d0c56
732 changed files with 252501 additions and 52 deletions
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Want to contribute? Great! First, read this page (including the small print at the end).
### Before you contribute
Before we can use your code, you must sign the
[Google Individual Contributor License Agreement](https://developers.google.com/open-source/cla/individual?csw=1)
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Contributions made by corporations are covered by a different agreement than
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# Project status #
![status: inactive](https://img.shields.io/badge/status-inactive-red.svg)
This project is no longer actively maintained, and remains here as an archive of this work.
For a replacement, check out [this actively maintained fork](https://github.com/kikinteractive/go-gcm) of the library.
GCM Library for Go
--
Provides the following functionality for Google Cloud Messaging:
1. Sending messages.
2. Listening to receiving messages.
Documentation: http://godoc.org/github.com/google/go-gcm
## Installation
$ go get github.com/google/go-gcm
## Status
This library is in Alpha. We will make an effort to support the library, but we reserve the right to make incompatible changes when necessary.
## Feedback
Please read CONTRIBUTING and raise issues here in Github.

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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package gcm provides send and receive GCM functionality.
package gcm
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"strings"
"sync"
"time"
"github.com/jpillora/backoff"
"github.com/mattn/go-xmpp"
"github.com/pborman/uuid"
)
const (
CCSAck = "ack"
CCSNack = "nack"
CCSControl = "control"
CCSReceipt = "receipt"
httpAddress = "https://gcm-http.googleapis.com/gcm/send"
xmppHost = "gcm.googleapis.com"
xmppPort = "5235"
xmppAddress = xmppHost + ":" + xmppPort
// For ccs the min for exponential backoff has to be 1 sec
ccsMinBackoff = 1 * time.Second
)
var (
// DebugMode determines whether to have verbose logging.
DebugMode = false
// Default Min and Max delay for backoff.
DefaultMinBackoff = 1 * time.Second
DefaultMaxBackoff = 10 * time.Second
retryableErrors = map[string]bool{
"Unavailable": true,
"SERVICE_UNAVAILABLE": true,
"InternalServerError": true,
"INTERNAL_SERVER_ ERROR": true,
// TODO(silvano): should we backoff with the same strategy on
// DeviceMessageRateExceeded and TopicsMessageRateExceeded.
}
// Cache of xmpp clients.
xmppClients = struct {
sync.Mutex
m map[string]*xmppGcmClient
}{
m: make(map[string]*xmppGcmClient),
}
)
// Prints debug info if DebugMode is set.
func debug(m string, v interface{}) {
if DebugMode {
log.Printf(m+":%+v", v)
}
}
// A GCM Http message.
type HttpMessage struct {
To string `json:"to,omitempty"`
RegistrationIds []string `json:"registration_ids,omitempty"`
CollapseKey string `json:"collapse_key,omitempty"`
Priority string `json:"priority,omitempty"`
ContentAvailable bool `json:"content_available,omitempty"`
DelayWhileIdle bool `json:"delay_while_idle,omitempty"`
TimeToLive *uint `json:"time_to_live,omitempty"`
RestrictedPackageName string `json:"restricted_package_name,omitempty"`
DryRun bool `json:"dry_run,omitempty"`
Data Data `json:"data,omitempty"`
Notification *Notification `json:"notification,omitempty"`
}
// A GCM Xmpp message.
type XmppMessage struct {
To string `json:"to,omitempty"`
MessageId string `json:"message_id"`
MessageType string `json:"message_type,omitempty"`
CollapseKey string `json:"collapse_key,omitempty"`
Priority string `json:"priority,omitempty"`
ContentAvailable bool `json:"content_available,omitempty"`
DelayWhileIdle bool `json:"delay_while_idle,omitempty"`
TimeToLive *uint `json:"time_to_live,omitempty"`
DeliveryReceiptRequested bool `json:"delivery_receipt_requested,omitempty"`
DryRun bool `json:"dry_run,omitempty"`
Data Data `json:"data,omitempty"`
Notification *Notification `json:"notification,omitempty"`
}
// HttpResponse is the GCM connection server response to an HTTP downstream message request.
type HttpResponse struct {
MulticastId int `json:"multicast_id,omitempty"`
Success uint `json:"success,omitempty"`
Failure uint `json:"failure,omitempty"`
CanonicalIds uint `json:"canonical_ids,omitempty"`
Results []Result `json:"results,omitempty"`
MessageId int `json:"message_id,omitempty"`
Error string `json:"error,omitempty"`
}
// Result represents the status of a processed Http message.
type Result struct {
MessageId string `json:"message_id,omitempty"`
RegistrationId string `json:"registration_id,omitempty"`
Error string `json:"error,omitempty"`
}
// CcsMessage is an Xmpp message sent from CCS.
type CcsMessage struct {
From string `json:"from, omitempty"`
MessageId string `json:"message_id, omitempty"`
MessageType string `json:"message_type, omitempty"`
RegistrationId string `json:"registration_id,omitempty"`
Error string `json:"error,omitempty"`
ErrorDescription string `json:"error_description,omitempty"`
Category string `json:"category, omitempty"`
Data Data `json:"data,omitempty"`
ControlType string `json:"control_type,omitempty"`
}
// Used to compute results for multicast messages with retries.
type multicastResultsState map[string]*Result
// The data payload of a GCM message.
type Data map[string]interface{}
// The notification payload of a GCM message.
type Notification struct {
Title string `json:"title,omitempty"`
Body string `json:"body,omitempty"`
Icon string `json:"icon,omitempty"`
Sound string `json:"sound,omitempty"`
Badge string `json:"badge,omitempty"`
Tag string `json:"tag,omitempty"`
Color string `json:"color,omitempty"`
ClickAction string `json:"click_action,omitempty"`
BodyLocKey string `json:"body_loc_key,omitempty"`
BodyLocArgs string `json:"body_loc_args,omitempty"`
TitleLocArgs string `json:"title_loc_args,omitempty"`
TitleLocKey string `json:"title_loc_key,omitempty"`
}
// MessageHandler is the type for a function that handles a CCS message.
// The CCS message can be an upstream message (device to server) or a
// message from CCS (e.g. a delivery receipt).
type MessageHandler func(cm CcsMessage) error
// httpClient is an interface to stub the http client in tests.
type httpClient interface {
send(apiKey string, m HttpMessage) (*HttpResponse, error)
getRetryAfter() string
}
// httpGcmClient is a client for the Gcm Http Connection Server.
type httpGcmClient struct {
GcmURL string
HttpClient *http.Client
retryAfter string
}
// httpGcmClient implementation to send a message through GCM Http server.
func (c *httpGcmClient) send(apiKey string, m HttpMessage) (*HttpResponse, error) {
bs, err := json.Marshal(m)
if err != nil {
return nil, fmt.Errorf("error marshalling message>%v", err)
}
debug("sending", string(bs))
req, err := http.NewRequest("POST", c.GcmURL, bytes.NewReader(bs))
if err != nil {
return nil, fmt.Errorf("error creating request>%v", err)
}
req.Header.Add(http.CanonicalHeaderKey("Content-Type"), "application/json")
req.Header.Add(http.CanonicalHeaderKey("Authorization"), authHeader(apiKey))
httpResp, err := c.HttpClient.Do(req)
if err != nil {
return nil, fmt.Errorf("error sending request to HTTP connection server>%v", err)
}
gcmResp := &HttpResponse{}
body, err := ioutil.ReadAll(httpResp.Body)
defer httpResp.Body.Close()
if err != nil {
return gcmResp, fmt.Errorf("error reading http response body>%v", err)
}
debug("received body", string(body))
err = json.Unmarshal(body, &gcmResp)
if err != nil {
return gcmResp, fmt.Errorf("error unmarshaling json from body: %v", err)
}
// TODO(silvano): this is assuming that the header contains seconds instead of a date, need to check
c.retryAfter = httpResp.Header.Get(http.CanonicalHeaderKey("Retry-After"))
return gcmResp, nil
}
// Get the value of the retry after header if present.
func (c httpGcmClient) getRetryAfter() string {
return c.retryAfter
}
// xmppClient is an interface to stub the xmpp client in tests.
type xmppClient interface {
listen(h MessageHandler, stop chan<- bool) error
send(m XmppMessage) (int, error)
}
// xmppGcmClient is a client for the Gcm Xmpp Connection Server (CCS).
type xmppGcmClient struct {
sync.RWMutex
XmppClient xmpp.Client
messages struct {
sync.RWMutex
m map[string]*messageLogEntry
}
senderID string
isClosed bool
}
// An entry in the messages log, used to keep track of messages pending ack and
// retries for failed messages.
type messageLogEntry struct {
body *XmppMessage
backoff *exponentialBackoff
}
// Factory method for xmppGcmClient, to minimize the number of clients to one per sender id.
// TODO(silvano): this could be revised, taking into account that we cannot have more than 1000
// connections per senderId.
func newXmppGcmClient(senderID string, apiKey string) (*xmppGcmClient, error) {
xmppClients.Lock()
defer xmppClients.Unlock()
if xc, ok := xmppClients.m[senderID]; ok {
return xc, nil
}
nc, err := xmpp.NewClient(xmppAddress, xmppUser(senderID), apiKey, DebugMode)
if err != nil {
return nil, fmt.Errorf("error connecting client>%v", err)
}
xc := &xmppGcmClient{
XmppClient: *nc,
messages: struct {
sync.RWMutex
m map[string]*messageLogEntry
}{
m: make(map[string]*messageLogEntry),
},
senderID: senderID,
}
xmppClients.m[senderID] = xc
return xc, nil
}
// xmppGcmClient implementation of listening for messages from CCS; the messages can be
// acks or nacks for messages sent through XMPP, control messages, upstream messages.
func (c *xmppGcmClient) listen(h MessageHandler, stop <-chan bool) error {
if stop != nil {
go func() {
select {
case <-stop:
// Set isClosed to 0 so we don't trigger an error when returning.
c.Lock()
c.XmppClient.Close()
c.isClosed = true
c.Unlock()
// Remove client from cache.
xmppClients.Lock()
delete(xmppClients.m, c.senderID)
xmppClients.Unlock()
}
}()
}
for {
stanza, err := c.XmppClient.Recv()
if err != nil {
c.RLock()
defer c.RUnlock()
// If client is closed we can't return without error.
if c.isClosed {
return nil
}
// This is likely fatal, so return.
return fmt.Errorf("error on Recv>%v", err)
}
v, ok := stanza.(xmpp.Chat)
if !ok {
continue
}
switch v.Type {
case "":
cm := &CcsMessage{}
err = json.Unmarshal([]byte(v.Other[0]), cm)
if err != nil {
debug("Error unmarshaling ccs message: %v", err)
continue
}
switch cm.MessageType {
case CCSAck:
c.messages.Lock()
// ack for a sent message, delete it from log.
if _, ok := c.messages.m[cm.MessageId]; ok {
go h(*cm)
delete(c.messages.m, cm.MessageId)
}
c.messages.Unlock()
case CCSNack:
// nack for a sent message, retry if retryable error, bubble up otherwise.
if retryableErrors[cm.Error] {
c.retryMessage(*cm, h)
} else {
c.messages.Lock()
if _, ok := c.messages.m[cm.MessageId]; ok {
go h(*cm)
delete(c.messages.m, cm.MessageId)
}
c.messages.Unlock()
}
default:
debug("Unknown ccs message: %v", cm)
}
case "normal":
cm := &CcsMessage{}
err = json.Unmarshal([]byte(v.Other[0]), cm)
if err != nil {
debug("Error unmarshaling ccs message: %v", err)
continue
}
switch cm.MessageType {
case CCSControl:
// TODO(silvano): create a new connection, drop the old one 'after a while'
debug("control message! %v", cm)
case CCSReceipt:
debug("receipt! %v", cm)
// Receipt message: send ack and pass to listener.
origMessageID := strings.TrimPrefix(cm.MessageId, "dr2:")
ack := XmppMessage{To: cm.From, MessageId: origMessageID, MessageType: CCSAck}
c.send(ack)
go h(*cm)
default:
debug("uknown upstream message! %v", cm)
// Upstream message: send ack and pass to listener.
ack := XmppMessage{To: cm.From, MessageId: cm.MessageId, MessageType: CCSAck}
c.send(ack)
go h(*cm)
}
case "error":
debug("error response %v", v)
default:
debug("unknown message type %v", v)
}
}
}
//TODO(silvano): add flow control (max 100 pending messages at one time)
// xmppGcmClient implementation to send a message through Gcm Xmpp server (ccs).
func (c *xmppGcmClient) send(m XmppMessage) (string, int, error) {
if m.MessageId == "" {
m.MessageId = uuid.New()
}
c.messages.Lock()
if _, ok := c.messages.m[m.MessageId]; !ok {
b := newExponentialBackoff()
if b.b.Min < ccsMinBackoff {
b.setMin(ccsMinBackoff)
}
c.messages.m[m.MessageId] = &messageLogEntry{body: &m, backoff: b}
}
c.messages.Unlock()
stanza := `<message id=""><gcm xmlns="google:mobile:data">%v</gcm></message>`
body, err := json.Marshal(m)
if err != nil {
return m.MessageId, 0, fmt.Errorf("could not unmarshal body of xmpp message>%v", err)
}
bs := string(body)
debug("Sending XMPP: ", fmt.Sprintf(stanza, bs))
// Serialize wire access for thread safety.
c.Lock()
defer c.Unlock()
bytes, err := c.XmppClient.SendOrg(fmt.Sprintf(stanza, bs))
return m.MessageId, bytes, err
}
// Retry sending a message with exponential backoff; if over limit, bubble up the failed message.
func (c *xmppGcmClient) retryMessage(cm CcsMessage, h MessageHandler) {
c.messages.RLock()
defer c.messages.RUnlock()
if me, ok := c.messages.m[cm.MessageId]; ok {
if me.backoff.sendAnother() {
go func(m *messageLogEntry) {
m.backoff.wait()
c.send(*m.body)
}(me)
} else {
debug("Exponential backoff failed over limit for message: ", me)
go h(cm)
}
}
}
// Interface to stub the http client in tests.
type backoffProvider interface {
sendAnother() bool
setMin(min time.Duration)
wait()
}
// Implementation of backoff provider using exponential backoff.
type exponentialBackoff struct {
b backoff.Backoff
currentDelay time.Duration
}
// Factory method for exponential backoff, uses default values for Min and Max and
// adds Jitter.
func newExponentialBackoff() *exponentialBackoff {
b := &backoff.Backoff{
Min: DefaultMinBackoff,
Max: DefaultMaxBackoff,
Jitter: true,
}
return &exponentialBackoff{b: *b, currentDelay: b.Duration()}
}
// Returns true if not over the retries limit
func (eb exponentialBackoff) sendAnother() bool {
return eb.currentDelay <= eb.b.Max
}
// Set the minumim delay for backoff
func (eb *exponentialBackoff) setMin(min time.Duration) {
eb.b.Min = min
if (eb.currentDelay) < min {
eb.currentDelay = min
}
}
// Wait for the current value of backoff
func (eb exponentialBackoff) wait() {
time.Sleep(eb.currentDelay)
eb.currentDelay = eb.b.Duration()
}
// Send a message using the HTTP GCM connection server.
func SendHttp(apiKey string, m HttpMessage) (*HttpResponse, error) {
c := &httpGcmClient{httpAddress, &http.Client{}, "0"}
b := newExponentialBackoff()
return sendHttp(apiKey, m, c, b)
}
// sendHttp sends an http message using exponential backoff, handling multicast replies.
func sendHttp(apiKey string, m HttpMessage, c httpClient, b backoffProvider) (*HttpResponse, error) {
// TODO(silvano): check this with responses for topic/notification group
gcmResp := &HttpResponse{}
var multicastId int
targets, err := messageTargetAsStringsArray(m)
if err != nil {
return gcmResp, fmt.Errorf("error extracting target from message: %v", err)
}
// make a copy of the targets to keep track of results during retries
localTo := make([]string, len(targets))
copy(localTo, targets)
resultsState := &multicastResultsState{}
for b.sendAnother() {
gcmResp, err = c.send(apiKey, m)
if err != nil {
return gcmResp, fmt.Errorf("error sending request to GCM HTTP server: %v", err)
}
if len(gcmResp.Results) > 0 {
doRetry, toRetry, err := checkResults(gcmResp.Results, localTo, *resultsState)
multicastId = gcmResp.MulticastId
if err != nil {
return gcmResp, fmt.Errorf("error checking GCM results: %v", err)
}
if doRetry {
retryAfter, err := time.ParseDuration(c.getRetryAfter())
if err != nil {
b.setMin(retryAfter)
}
localTo = make([]string, len(toRetry))
copy(localTo, toRetry)
if m.RegistrationIds != nil {
m.RegistrationIds = toRetry
}
b.wait()
continue
} else {
break
}
} else {
break
}
}
// if it was multicast, reconstruct response in case there have been retries
if len(targets) > 1 {
gcmResp = buildRespForMulticast(targets, *resultsState, multicastId)
}
return gcmResp, nil
}
// Builds the final response for a multicast message, in case there have been retries for
// subsets of the original recipients.
func buildRespForMulticast(to []string, mrs multicastResultsState, mid int) *HttpResponse {
resp := &HttpResponse{}
resp.MulticastId = mid
resp.Results = make([]Result, len(to))
for i, regId := range to {
result, ok := mrs[regId]
if !ok {
continue
}
resp.Results[i] = *result
if result.MessageId != "" {
resp.Success++
} else if result.Error != "" {
resp.Failure++
}
if result.RegistrationId != "" {
resp.CanonicalIds++
}
}
return resp
}
// Transform the recipient in an array of strings if needed.
func messageTargetAsStringsArray(m HttpMessage) ([]string, error) {
if m.RegistrationIds != nil {
return m.RegistrationIds, nil
} else if m.To != "" {
target := []string{m.To}
return target, nil
}
target := []string{}
return target, fmt.Errorf("can't find any valid target field in message.")
}
// For a multicast send, determines which errors can be retried.
func checkResults(gcmResults []Result, recipients []string, resultsState multicastResultsState) (doRetry bool, toRetry []string, err error) {
doRetry = false
toRetry = []string{}
for i := 0; i < len(gcmResults); i++ {
result := gcmResults[i]
regId := recipients[i]
resultsState[regId] = &result
if result.Error != "" {
if retryableErrors[result.Error] {
toRetry = append(toRetry, regId)
if doRetry == false {
doRetry = true
}
}
}
}
return doRetry, toRetry, nil
}
// SendXmpp sends a message using the XMPP GCM connection server.
func SendXmpp(senderId, apiKey string, m XmppMessage) (string, int, error) {
c, err := newXmppGcmClient(senderId, apiKey)
if err != nil {
return "", 0, fmt.Errorf("error creating xmpp client>%v", err)
}
return c.send(m)
}
// Listen blocks and connects to GCM waiting for messages, calling the handler
// for CCS message that can be of interest to the listener: upstream messages, delivery receipt
// notifications, errors. An optional stop channel can be provided to
// stop listening.
func Listen(senderId, apiKey string, h MessageHandler, stop <-chan bool) error {
cl, err := newXmppGcmClient(senderId, apiKey)
if err != nil {
return fmt.Errorf("error creating xmpp client>%v", err)
}
return cl.listen(h, stop)
}
// authHeader generates an authorization header value for an api key.
func authHeader(apiKey string) string {
return fmt.Sprintf("key=%v", apiKey)
}
// xmppUser generates an xmpp username from a sender ID.
func xmppUser(senderId string) string {
return senderId + "@" + xmppHost
}