forked from nimajalali/go-force
/
stream.go
361 lines (304 loc) · 8.87 KB
/
stream.go
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package force
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/http/cookiejar"
"strings"
"time"
"github.com/sirupsen/logrus"
"github.com/sony/gobreaker"
"golang.org/x/net/publicsuffix"
"github.com/dewisuryani/go-force/common/mapper"
"github.com/dewisuryani/go-force/common/response"
"github.com/dewisuryani/go-force/common/syncmap"
)
//StreamsForce struct
type StreamsForce struct {
APIForce *ForceApi
ClientID string
Subscribes syncmap.SubscribeMap
Timeout int
LongPoolClient *http.Client
}
//CometdVersion global var
var (
CometdVersion string = "50.0"
TopicMode = map[string]string{
"CDC": "/data/%vChangeEvent",
"Event": "/event/%v",
"PushTopic": "/topic/%v",
}
)
const BreakerTimeout = time.Second * 30
var cb *gobreaker.CircuitBreaker
func init() {
cb = gobreaker.NewCircuitBreaker(gobreaker.Settings{
Name: "reconnect",
Timeout: BreakerTimeout,
ReadyToTrip: func(counts gobreaker.Counts) bool {
return counts.ConsecutiveFailures > 2
},
})
}
func IsBreakerClosed() bool {
return cb.State() == gobreaker.StateClosed
}
func (s *StreamsForce) httpPost(ctx context.Context, payload string) (*http.Response, error) {
ioPayload := strings.NewReader(payload)
endpoint := s.APIForce.oauth.InstanceUrl + "/cometd/" + CometdVersion
headerVal := "OAuth " + s.APIForce.oauth.AccessToken
request, _ := http.NewRequest("POST", endpoint, ioPayload)
request.Header.Set("Content-Type", "application/json")
request.Header.Set("Authorization", headerVal)
if ctx != nil {
request = request.WithContext(ctx)
}
resp, err := s.LongPoolClient.Do(request)
return resp, err
}
func (s *StreamsForce) performTask(ctx context.Context, params string) ([]byte, error) {
res, err := cb.Execute(func() (interface{}, error) {
resp, err := s.httpPost(ctx, params)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
}).Error("http error")
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode >= 300 {
err = errors.New(http.StatusText(resp.StatusCode))
logrus.WithFields(logrus.Fields{
"err": err,
}).Error("http error")
return nil, err
}
respBytes, err := ioutil.ReadAll(resp.Body)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
}).Error("http error")
return nil, err
}
return respBytes, err
})
resByt, _ := res.([]byte)
return resByt, err
}
func (s *StreamsForce) connect(ctx context.Context) ([]byte, error) {
connectParams := `{"channel": "/meta/connect", "clientId": "` + s.ClientID + `", "connectionType": "long-polling"}`
return s.performTask(ctx, connectParams)
}
func (s *StreamsForce) disconnect(ctx context.Context) ([]byte, error) {
disconnectParams := `{"channel": "/meta/disconnect", "clientId": "` + s.ClientID + `"}`
return s.performTask(ctx, disconnectParams)
}
func (s *StreamsForce) handshake(ctx context.Context) ([]byte, error) {
handshakeParams := `{"channel":"/meta/handshake", "supportedConnectionTypes":["long-polling"], "version":"1.0"}`
return s.performTask(ctx, handshakeParams)
}
func checkClientError(data []map[string]interface{}) error {
resp := []*response.Response{}
err := mapper.ArrMapStringToStruct(data, &resp)
if err != nil {
return err
}
if len(resp) == 0 {
return errors.New("no response")
}
if resp[0].Error == "" {
return nil
}
return errors.New(resp[0].Error)
}
//ConnectToStreamingAPIWithHandshake connects to streaming API
func (forceAPI *ForceApi) ConnectToStreamingAPIWithHandshake(ctx context.Context) error {
start := time.Now()
defer func() {
stop := time.Now()
logrus.WithFields(logrus.Fields{
"timeConsume": stop.Sub(start).Milliseconds(),
}).Info("time needed for fully connected without go-routine")
}()
//set up the client
cookiejarOptions := cookiejar.Options{
PublicSuffixList: publicsuffix.List,
}
jar, err := cookiejar.New(&cookiejarOptions)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
}).Error("create cookie error")
return err
}
forceAPI.stream = &StreamsForce{
APIForce: forceAPI,
ClientID: "",
Subscribes: syncmap.SubscribeMap{
Data: make(map[string]syncmap.CallbackFunc),
},
Timeout: 0,
LongPoolClient: &http.Client{
Jar: jar,
},
}
//handshake
handshakeBytes, err := forceAPI.stream.handshake(ctx)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
}).Error("handshake failed")
return err
}
var data []map[string]interface{}
json.Unmarshal(handshakeBytes, &data)
err = checkClientError(data)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
}).Error("handshake failed")
}
logrus.WithFields(logrus.Fields{
"data": data,
}).Info("handshake streaming api")
forceAPI.stream.ClientID = data[0][clientIDParam].(string)
//connect
connBytes, err := forceAPI.stream.connect(ctx)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
"clientId": forceAPI.stream.ClientID,
}).Error("connect failed")
return err
}
var connectData []map[string]interface{}
json.Unmarshal(connBytes, &connectData)
err = checkClientError(connectData)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
"clientId": forceAPI.stream.ClientID,
}).Error("connect failed")
return err
}
for _, msg := range data {
cb, ok := forceAPI.stream.Subscribes.Read(msg[channelParam].(string))
if !ok || cb == nil || string(connBytes) == "" {
continue
}
cb(connBytes)
}
logrus.WithFields(logrus.Fields{
"data": connectData,
}).Info("connect streaming api")
return err
}
//Stream consume stream to streaming API. Do handshake first before calling di function
func (forceAPI *ForceApi) Stream(ctx context.Context) error {
for {
select {
case <-ctx.Done():
return nil
default:
connBytes, err := forceAPI.stream.connect(ctx)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
"clientId": forceAPI.stream.ClientID,
}).Error("connect failed")
return err
}
var connectData []map[string]interface{}
json.Unmarshal(connBytes, &connectData)
logrus.WithFields(logrus.Fields{
"resp": connectData,
"clientId": forceAPI.stream.ClientID,
}).Info("reconnecting")
err = checkClientError(connectData)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
"clientId": forceAPI.stream.ClientID,
}).Error("connect failed")
return err
}
for _, msg := range connectData {
cb, ok := forceAPI.stream.Subscribes.Read(msg[channelParam].(string))
if !ok || cb == nil || string(connBytes) == "" {
continue
}
cb(connBytes)
}
}
}
}
//ConnectToStreamingAPI connects to streaming API
func (forceAPI *ForceApi) DisconnectStreamingAPI(ctx context.Context) error {
disconnectBytes, err := forceAPI.stream.disconnect(ctx)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
"clientId": forceAPI.stream.ClientID,
}).Error("disconnect failed")
return err
}
var data []map[string]interface{}
json.Unmarshal(disconnectBytes, &data)
logrus.WithFields(logrus.Fields{
"data": data,
}).Info("disconnect streaming api")
return nil
}
func getTopic(mode, topic string) string {
topicMode, ok := TopicMode[mode]
if !ok {
logrus.WithFields(logrus.Fields{
"mode": mode,
"topic": topic,
}).Error("invalid mode")
panic("invalid mode")
}
return fmt.Sprintf(topicMode, topic)
}
//Subscribe receives message from any mode such as:
// "CDC" : Change Data Capture
// "PushTopic" : Push Topic
// "Event" : Event
func (forceAPI *ForceApi) Subscribe(ctx context.Context, mode, topic string, callback func([]byte, ...interface{})) ([]byte, error) {
//Get topic by mode
topicString := getTopic(mode, topic)
subscribeParams := `{ "channel": "/meta/subscribe", "clientId": "` + forceAPI.stream.ClientID + `", "subscription": "` + topicString + `"}`
subscribeBytes, err := forceAPI.stream.performTask(ctx, subscribeParams)
if err != nil {
logrus.WithFields(logrus.Fields{
"err": err,
"clientId": forceAPI.stream.ClientID,
"topic": topicString,
}).Error("subscribe failed")
}
logrus.WithFields(logrus.Fields{
"data": string(subscribeBytes),
"param": subscribeParams,
}).Info("subscribe streaming api")
forceAPI.stream.Subscribes.Write(topicString, callback)
return subscribeBytes, err
}
//Unsubscribe from
func (forceAPI *ForceApi) Unsubscribe(ctx context.Context, mode, topic string) ([]byte, error) {
topicString := getTopic(mode, topic)
unsubscribeParam := `{ "channel": "/meta/unsubscribe", "clientId": "` + forceAPI.stream.ClientID + `", "unsubscription": "` + topicString + `"}`
unsubscribeBytes, err := forceAPI.stream.performTask(ctx, unsubscribeParam)
if err != nil {
return nil, err
}
logrus.WithFields(logrus.Fields{
"data": string(unsubscribeBytes),
"param": unsubscribeParam,
}).Info("unsubscribe streaming api")
forceAPI.stream.Subscribes.Delete(topicString)
return unsubscribeBytes, err
}