/
websocket.go
222 lines (192 loc) · 6.96 KB
/
websocket.go
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package cfg
import (
"encoding/base64"
"fmt"
"net/http"
"strings"
"time"
"github.com/apex/log"
"github.com/gorilla/websocket"
"github.com/kafkaesque-io/pulsar-monitor/src/util"
)
// PulsarMessage is the required message format for Pulsar Websocket message
type PulsarMessage struct {
Payload string `json:"payload"`
Properties map[string]interface{} `json:"properties"`
Context string `json:"context,omitempty"`
}
// ReceivingMessage is the Pulsar message for socket consumer
type ReceivingMessage struct {
Payload string `json:"payload"`
MessageID string `json:"messageId"`
Properties map[string]interface{} `json:"properties"`
Context string `json:"context,omitempty"`
}
// AckMessage is the message struct to acknowledge a message
type AckMessage struct {
MessageID string `json:"messageId"`
}
func (w *WsConfig) reconcileConfig() error {
wsv2 := "/ws/v2/"
if !strings.HasPrefix(w.ProducerURL, "ws") {
w.ProducerURL = w.Scheme + w.Cluster + ":" + w.Port + wsv2 + "producer/" + w.TopicName
}
if !strings.HasPrefix(w.ConsumerURL, "ws") {
w.ConsumerURL = w.Scheme + w.Cluster + ":" + w.Port + wsv2 + "consumer/" + w.TopicName + "/"
if w.Subscription != "" {
w.ConsumerURL = w.ConsumerURL + w.Subscription
} else {
w.ConsumerURL = w.ConsumerURL + "ws-latency-subscription"
}
}
if w.URLQueryParams != "" {
w.ConsumerURL = w.ConsumerURL + "?" + w.URLQueryParams
w.ProducerURL = w.ProducerURL + "?" + w.URLQueryParams
}
return nil
}
func tokenAsURLQueryParam(url, token string) string {
if strings.HasSuffix(url, "?token=") {
return url + token
}
return url
}
// WsLatencyTest latency test for websocket
func WsLatencyTest(producerURL, subscriptionURL, token string) (MsgResult, error) {
wsHeaders := http.Header{}
if token != "" {
bearerToken := "Bearer " + token
wsHeaders.Add("Authorization", bearerToken)
}
prodURL := tokenAsURLQueryParam(producerURL, token)
subsURL := tokenAsURLQueryParam(subscriptionURL, token)
// log.Infof("wss producer connection url %s\n\t\tconsumer url %s\n", prodURL, subsURL)
prodConn, _, err := websocket.DefaultDialer.Dial(prodURL, wsHeaders)
if err != nil {
return MsgResult{Latency: failedLatency}, err
}
defer prodConn.Close()
consConn, _, err := websocket.DefaultDialer.Dial(subsURL, wsHeaders)
if err != nil {
return MsgResult{Latency: failedLatency}, err
}
defer consConn.Close()
errChan := make(chan error)
// do not close errChan since there could be timing issue for Consumer listener to send after the close()
// GC will do the clean up
// notify the main thread with the latency to complete the exit
completeChan := make(chan time.Time, 1)
defer close(completeChan)
messageText := fmt.Sprintf("test websocket lantecy %s", time.Now())
// Consumer listener
go func(expectedMsg string) {
defer func() {
if r := recover(); r != nil {
log.Infof("Recovered from websocket consumer listener panic %v", r)
}
}()
for wait := true; wait; {
var msg ReceivingMessage
err := consConn.ReadJSON(&msg)
if err != nil {
log.Infof("ws consumer read error: %v", err)
errChan <- err
return
}
decoded, err := base64.StdEncoding.DecodeString(msg.Payload)
if err != nil {
log.Infof("ws consumer decode error: %v", err)
errChan <- err
return
}
decodedStr := string(decoded)
actMsg := &AckMessage{MessageID: msg.MessageID}
if err = consConn.WriteJSON(actMsg); err != nil {
log.Infof("ws consumer failed to ack message %s", err.Error())
errChan <- err
return
}
if decodedStr == expectedMsg {
wait = false
completeChan <- time.Now()
}
}
}(messageText)
// Producer listener
go func() {
_, rawBytes, err := prodConn.ReadMessage()
if err != nil {
log.Errorf("websocket producer received benign error: %v", err)
return
}
byteMessage, err := base64.StdEncoding.DecodeString(string(rawBytes))
if err != nil {
log.Errorf("decode producer response error: %v", err)
return
}
log.Infof("websocket producer received response: %s", string(byteMessage))
}()
encodedText := base64.StdEncoding.EncodeToString([]byte(messageText))
message := &PulsarMessage{Payload: encodedText}
// for mesaure latency
sentTime := time.Now()
err = prodConn.WriteJSON(message)
if err != nil {
return MsgResult{Latency: failedLatency}, err
}
for {
select {
case receivedTime := <-completeChan:
return MsgResult{Latency: receivedTime.Sub(sentTime)}, nil
case err := <-errChan:
log.Errorf("websocket error: %v", err)
return MsgResult{Latency: failedLatency}, err
case <-time.After(30 * time.Second):
return MsgResult{Latency: failedLatency}, fmt.Errorf("timed out without receiving the expect message")
}
}
}
// TestWsLatency test all clusters' websocket pub sub latency
func TestWsLatency(config WsConfig) {
token := util.AssignString(config.Token, GetConfig().Token)
expectedLatency := util.TimeDuration(config.LatencyBudgetMs, 2*latencyBudget, time.Millisecond)
stdVerdict := util.GetStdBucket(config.Cluster)
result, err := WsLatencyTest(config.ProducerURL, config.ConsumerURL, token)
if err != nil {
errMsg := fmt.Sprintf("cluster %s, %s websocket latency test Pulsar error: %v", config.Cluster, config.Name, err)
VerboseAlert(config.Name+"-websocket-err", errMsg, 3*time.Minute)
} else if result.Latency > expectedLatency {
stdVerdict.Add(float64(result.Latency.Milliseconds()))
errMsg := fmt.Sprintf("cluster %s, %s websocket test message latency %v over the budget %v",
config.Cluster, config.Name, result.Latency, expectedLatency)
VerboseAlert(config.Name+"-websocket-latency", errMsg, 3*time.Minute)
ReportIncident(config.Name, config.Cluster, "websocket persisted latency test failure", errMsg, &config.AlertPolicy)
} else if stddev, mean, within3Sigma := stdVerdict.Push(float64(result.Latency.Milliseconds())); !within3Sigma {
errMsg := fmt.Sprintf("cluster %s, websocket test message latency %v over three standard deviation %v ms and mean is %v ms",
config.Cluster, result.Latency, stddev, mean)
VerboseAlert(config.Name+"-websocket-stddev", errMsg, 10*time.Minute)
ReportIncident(config.Name, config.Cluster, "websocket persisted latency test failure", errMsg, &config.AlertPolicy)
} else {
log.Infof("websocket pubsub succeeded with latency %v expected latency %v on topic %s, cluster %s\n",
result.Latency, expectedLatency, config.TopicName, config.Cluster)
ClearIncident(config.Name)
}
PromLatencySum(GetGaugeType(websocketSubsystem), config.Cluster, result.Latency)
}
// WebSocketTopicLatencyTestThread tests a message websocket delivery in topic and measure the latency.
func WebSocketTopicLatencyTestThread() {
configs := GetConfig().WebSocketConfig
for _, cfg := range configs {
cfg.reconcileConfig()
go func(t WsConfig) {
ticker := time.NewTicker(util.TimeDuration(t.IntervalSeconds, 60, time.Second))
TestWsLatency(t)
for {
select {
case <-ticker.C:
TestWsLatency(t)
}
}
}(cfg)
}
}