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webhook.go
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webhook.go
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package webhook
import (
"bytes"
"context"
"encoding/json"
"errors"
"io"
"mime/multipart"
"net/http"
"net/url"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/hashicorp/go-retryablehttp"
"golang.org/x/exp/slices"
"github.com/rudderlabs/rudder-go-kit/logger"
"github.com/rudderlabs/rudder-go-kit/stats"
gwstats "github.com/rudderlabs/rudder-server/gateway/internal/stats"
"github.com/rudderlabs/rudder-server/gateway/response"
"github.com/rudderlabs/rudder-server/utils/misc"
)
var (
sourceTransformerURL string
webhookBatchTimeout time.Duration
maxTransformerProcess int
maxWebhookBatchSize int
webhookRetryMax int
webhookRetryWaitMax time.Duration
webhookRetryWaitMin time.Duration
pkgLogger logger.Logger
sourceListForParsingParams []string
)
func Init() {
loadConfig()
pkgLogger = logger.NewLogger().Child("gateway").Child("webhook")
}
type webhookT struct {
request *http.Request
writer http.ResponseWriter
done chan<- transformerResponse
sourceType string
writeKey string
}
type batchWebhookT struct {
batchRequest []*webhookT
sourceType string
}
//go:generate mockgen -destination=../../mocks/gateway/webhook.go -package=mocks_gateway github.com/rudderlabs/rudder-server/gateway/webhook Webhook
type Webhook interface {
RequestHandler(w http.ResponseWriter, r *http.Request)
Register(name string)
Shutdown() error
}
type HandleT struct {
requestQMu sync.RWMutex
requestQ map[string]chan *webhookT
batchRequestQ chan *batchWebhookT
netClient *retryablehttp.Client
gwHandle GatewayI
stats stats.Stats
ackCount uint64
recvCount uint64
batchRequestsWg sync.WaitGroup
backgroundWait func() error
backgroundCancel context.CancelFunc
}
type webhookSourceStatT struct {
id string
numEvents stats.Measurement
numOutputEvents stats.Measurement
sourceTransform stats.Measurement
}
type webhookStatsT struct {
sentStat stats.Measurement
receivedStat stats.Measurement
failedStat stats.Measurement
transformTimerStat stats.Measurement
sourceStats map[string]*webhookSourceStatT
}
type batchWebhookTransformerT struct {
webhook *HandleT
stats *webhookStatsT
sourceTransformerURL string
}
type batchTransformerOption func(bt *batchWebhookTransformerT)
func parseWriteKey(req *http.Request) (writeKey string, found bool) {
queryParams := req.URL.Query()
writeKeys, found := queryParams["writeKey"]
if found && writeKeys[0] != "" {
writeKey = writeKeys[0]
} else {
writeKey, _, found = req.BasicAuth()
}
return
}
func (webhook *HandleT) failRequest(w http.ResponseWriter, r *http.Request, reason string, code int) {
statusCode := http.StatusBadRequest
if code != 0 {
statusCode = code
}
pkgLogger.Infof("IP: %s -- %s -- Response: %d, %s", misc.GetIPFromReq(r), r.URL.Path, code, reason)
http.Error(w, reason, statusCode)
webhook.gwHandle.IncrementAckCount(1)
}
func (webhook *HandleT) RequestHandler(w http.ResponseWriter, r *http.Request) {
pkgLogger.LogRequest(r)
webhook.gwHandle.IncrementRecvCount(1)
atomic.AddUint64(&webhook.recvCount, 1)
writeKey, ok := parseWriteKey(r)
if !ok {
stat := &gwstats.SourceStat{
Source: "noWriteKey",
ReqType: "webhook",
}
stat.RequestFailed("noWriteKey")
stat.Report(webhook.stats)
webhook.failRequest(
w,
r,
response.GetStatus(response.NoWriteKeyInQueryParams),
response.GetErrorStatusCode(response.NoWriteKeyInQueryParams),
)
atomic.AddUint64(&webhook.ackCount, 1)
return
}
sourceDefName, ok := webhook.gwHandle.GetWebhookSourceDefName(writeKey)
if !ok {
stat := webhook.gwHandle.NewSourceStat(writeKey, "webhook")
stat.RequestFailed("invalidWriteKey")
stat.Report(webhook.stats)
webhook.failRequest(
w,
r,
response.GetStatus(response.InvalidWriteKey),
response.GetErrorStatusCode(response.InvalidWriteKey),
)
atomic.AddUint64(&webhook.ackCount, 1)
return
}
var postFrom url.Values
var multipartForm *multipart.Form
if r.Method == "GET" {
return
}
contentType := r.Header.Get("Content-Type")
if strings.Contains(strings.ToLower(contentType), "application/x-www-form-urlencoded") {
if err := r.ParseForm(); err != nil {
stat := webhook.gwHandle.NewSourceStat(writeKey, "webhook")
stat.RequestFailed("couldNotParseForm")
stat.Report(webhook.stats)
webhook.failRequest(
w,
r,
response.GetStatus(response.ErrorInParseForm),
response.GetErrorStatusCode(response.ErrorInParseForm),
)
atomic.AddUint64(&webhook.ackCount, 1)
return
}
postFrom = r.PostForm
} else if strings.Contains(strings.ToLower(contentType), "multipart/form-data") {
if err := r.ParseMultipartForm(32 << 20); err != nil {
stat := webhook.gwHandle.NewSourceStat(writeKey, "webhook")
stat.RequestFailed("couldNotParseMultiform")
stat.Report(webhook.stats)
webhook.failRequest(
w,
r,
response.GetStatus(response.ErrorInParseMultiform),
response.GetErrorStatusCode(response.ErrorInParseMultiform),
)
atomic.AddUint64(&webhook.ackCount, 1)
return
}
multipartForm = r.MultipartForm
}
var jsonByte []byte
var err error
if r.MultipartForm != nil {
jsonByte, err = json.Marshal(multipartForm)
if err != nil {
stat := webhook.gwHandle.NewSourceStat(writeKey, "webhook")
stat.RequestFailed("couldNotMarshal")
stat.Report(webhook.stats)
webhook.failRequest(
w,
r,
response.GetStatus(response.ErrorInMarshal),
response.GetErrorStatusCode(response.ErrorInMarshal),
)
atomic.AddUint64(&webhook.ackCount, 1)
return
}
} else if len(postFrom) != 0 {
jsonByte, err = json.Marshal(postFrom)
if err != nil {
stat := webhook.gwHandle.NewSourceStat(writeKey, "webhook")
stat.RequestFailed("couldNotMarshal")
stat.Report(webhook.stats)
webhook.failRequest(
w,
r,
response.GetStatus(response.ErrorInMarshal),
response.GetErrorStatusCode(response.ErrorInMarshal),
)
atomic.AddUint64(&webhook.ackCount, 1)
return
}
}
if len(jsonByte) != 0 {
r.Body = io.NopCloser(bytes.NewReader(jsonByte))
r.Header.Set("Content-Type", "application/json")
}
done := make(chan transformerResponse)
req := webhookT{request: r, writer: w, done: done, sourceType: sourceDefName, writeKey: writeKey}
webhook.requestQMu.RLock()
requestQ := webhook.requestQ[sourceDefName]
requestQ <- &req
webhook.requestQMu.RUnlock()
// Wait for batcher process to be done
resp := <-done
webhook.gwHandle.IncrementAckCount(1)
atomic.AddUint64(&webhook.ackCount, 1)
webhook.gwHandle.TrackRequestMetrics(resp.Err)
ss := webhook.gwHandle.NewSourceStat(writeKey, "webhook")
if resp.Err != "" {
code := http.StatusBadRequest
if resp.StatusCode != 0 {
code = resp.StatusCode
}
pkgLogger.Infof("IP: %s -- %s -- Response: %d, %s", misc.GetIPFromReq(r), r.URL.Path, code, resp.Err)
http.Error(w, resp.Err, code)
ss.RequestFailed("error")
ss.Report(webhook.stats)
return
}
payload := []byte(response.Ok)
if resp.OutputToSource != nil {
payload = resp.OutputToSource.Body
w.Header().Set("Content-Type", resp.OutputToSource.ContentType)
}
pkgLogger.Debugf("IP: %s -- %s -- Response: 200, %s", misc.GetIPFromReq(r), r.URL.Path, response.GetStatus(response.Ok))
_, _ = w.Write(payload)
ss.RequestSucceeded()
ss.Report(webhook.stats)
}
func (webhook *HandleT) batchRequests(sourceDef string, requestQ chan *webhookT) {
reqBuffer := make([]*webhookT, 0)
timeout := time.After(webhookBatchTimeout)
for {
select {
case req, hasMore := <-requestQ:
if !hasMore {
if len(reqBuffer) > 0 {
// If there are requests in the buffer, send them to the batcher
breq := batchWebhookT{batchRequest: reqBuffer, sourceType: sourceDef}
webhook.batchRequestQ <- &breq
}
return
}
// Append to request buffer
reqBuffer = append(reqBuffer, req)
if len(reqBuffer) == maxWebhookBatchSize {
breq := batchWebhookT{batchRequest: reqBuffer, sourceType: sourceDef}
webhook.batchRequestQ <- &breq
reqBuffer = make([]*webhookT, 0)
}
case <-timeout:
timeout = time.After(webhookBatchTimeout)
if len(reqBuffer) > 0 {
breq := batchWebhookT{batchRequest: reqBuffer, sourceType: sourceDef}
webhook.batchRequestQ <- &breq
reqBuffer = make([]*webhookT, 0)
}
}
}
}
// TODO : return back immediately for blank request body. its waiting till timeout
func (bt *batchWebhookTransformerT) batchTransformLoop() {
for breq := range bt.webhook.batchRequestQ {
var payloadArr [][]byte
var webRequests []*webhookT
for _, req := range breq.batchRequest {
body, err := io.ReadAll(req.request.Body)
_ = req.request.Body.Close()
if err != nil {
req.done <- transformerResponse{Err: response.GetStatus(response.RequestBodyReadFailed)}
continue
}
if slices.Contains(sourceListForParsingParams, strings.ToLower(breq.sourceType)) {
queryParams := req.request.URL.Query()
paramsBytes, err := json.Marshal(queryParams)
if err != nil {
req.done <- transformerResponse{Err: response.GetStatus(response.ErrorInMarshal)}
continue
}
closingBraceIdx := bytes.LastIndexByte(body, '}')
if closingBraceIdx == -1 {
req.done <- transformerResponse{Err: response.GetStatus(response.InvalidJSON)}
continue
}
appendData := []byte(`, "query_parameters": `)
appendData = append(appendData, paramsBytes...)
body = append(body[:closingBraceIdx], appendData...)
body = append(body, '}')
}
if !json.Valid(body) {
req.done <- transformerResponse{Err: response.GetStatus(response.InvalidJSON)}
continue
}
payloadArr = append(payloadArr, body)
webRequests = append(webRequests, req)
}
if len(payloadArr) == 0 {
continue
}
if _, ok := bt.stats.sourceStats[breq.sourceType]; !ok {
bt.stats.sourceStats[breq.sourceType] = newWebhookStat(breq.sourceType)
}
// stats
bt.stats.sourceStats[breq.sourceType].numEvents.Count(len(payloadArr))
transformStart := time.Now()
batchResponse := bt.transform(payloadArr, breq.sourceType)
// stats
bt.stats.sourceStats[breq.sourceType].sourceTransform.Since(transformStart)
if batchResponse.batchError == nil && len(batchResponse.responses) != len(payloadArr) {
batchResponse.batchError = errors.New("webhook batch transform response events size does not equal sent events size")
pkgLogger.Errorf("%w", batchResponse.batchError)
}
if batchResponse.batchError != nil {
statusCode := http.StatusInternalServerError
if batchResponse.statusCode != 0 {
statusCode = batchResponse.statusCode
}
pkgLogger.Errorf("webhook %s source transformation failed with error: %w and status code: %s", breq.sourceType, batchResponse.batchError, statusCode)
countWebhookErrors(breq.sourceType, statusCode, len(breq.batchRequest))
for _, req := range breq.batchRequest {
req.done <- transformerResponse{StatusCode: statusCode, Err: batchResponse.batchError.Error()}
}
continue
}
bt.stats.sourceStats[breq.sourceType].numOutputEvents.Count(len(batchResponse.responses))
for idx, resp := range batchResponse.responses {
webRequest := webRequests[idx]
if resp.Err == "" && resp.Output != nil {
var errMessage string
outputPayload, err := json.Marshal(resp.Output)
if err != nil {
errMessage = response.SourceTransformerInvalidOutputFormatInResponse
} else {
errMessage = bt.webhook.enqueueInGateway(webRequest, outputPayload)
}
if errMessage != "" {
pkgLogger.Errorf("webhook %s source transformation failed: %s", breq.sourceType, errMessage)
countWebhookErrors(breq.sourceType, response.GetErrorStatusCode(errMessage), 1)
webRequest.done <- bt.markResponseFail(errMessage)
continue
}
} else if resp.StatusCode != http.StatusOK {
pkgLogger.Errorf("webhook %s source transformation failed with error: %s and status code: %s", breq.sourceType, resp.Err, resp.StatusCode)
countWebhookErrors(breq.sourceType, resp.StatusCode, 1)
}
webRequest.done <- resp
}
}
}
func (webhook *HandleT) enqueueInGateway(req *webhookT, payload []byte) string {
// replace body with transformed event (it comes in a batch format)
req.request.Body = io.NopCloser(bytes.NewReader(payload))
// set write key in basic auth header
req.request.SetBasicAuth(req.writeKey, "")
payload, err := io.ReadAll(req.request.Body)
_ = req.request.Body.Close()
if err != nil {
return err.Error()
}
return webhook.gwHandle.ProcessWebRequest(&req.writer, req.request, "batch", payload, req.writeKey)
}
func (webhook *HandleT) Register(name string) {
webhook.requestQMu.Lock()
defer webhook.requestQMu.Unlock()
if _, ok := webhook.requestQ[name]; !ok {
requestQ := make(chan *webhookT)
webhook.requestQ[name] = requestQ
webhook.batchRequestsWg.Add(1)
go (func() {
defer webhook.batchRequestsWg.Done()
webhook.batchRequests(name, requestQ)
})()
}
}
func (webhook *HandleT) Shutdown() error {
webhook.backgroundCancel()
webhook.requestQMu.Lock()
defer webhook.requestQMu.Unlock()
for _, q := range webhook.requestQ {
close(q)
}
webhook.batchRequestsWg.Wait()
close(webhook.batchRequestQ)
webhook.requestQ = make(map[string]chan *webhookT)
return webhook.backgroundWait()
}
func countWebhookErrors(sourceType string, statusCode, count int) {
stats.Default.NewTaggedStat("webhook_num_errors", stats.CountType, stats.Tags{
"sourceType": sourceType,
"statusCode": strconv.Itoa(statusCode),
}).Count(count)
}
// TODO: Check if correct
func newWebhookStat(sourceType string) *webhookSourceStatT {
tags := map[string]string{
"sourceType": sourceType,
}
numEvents := stats.Default.NewTaggedStat("webhook_num_events", stats.CountType, tags)
numOutputEvents := stats.Default.NewTaggedStat("webhook_num_output_events", stats.CountType, tags)
sourceTransform := stats.Default.NewTaggedStat("webhook_dest_transform", stats.TimerType, tags)
return &webhookSourceStatT{
id: sourceType,
numEvents: numEvents,
numOutputEvents: numOutputEvents,
sourceTransform: sourceTransform,
}
}
func (webhook *HandleT) printStats(ctx context.Context) {
var lastRecvCount, lastAckCount uint64
for {
if lastRecvCount != webhook.recvCount || lastAckCount != webhook.ackCount {
lastRecvCount = webhook.recvCount
lastAckCount = webhook.ackCount
pkgLogger.Debug("Webhook Recv/Ack ", webhook.recvCount, webhook.ackCount)
}
select {
case <-ctx.Done():
return
case <-time.After(10 * time.Second):
}
}
}