/
http.go
271 lines (228 loc) · 8.51 KB
/
http.go
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package adapters
import (
"bytes"
"encoding/json"
"fmt"
"github.com/jitsucom/jitsu/server/events"
"github.com/jitsucom/jitsu/server/logging"
"github.com/jitsucom/jitsu/server/queue"
"github.com/jitsucom/jitsu/server/safego"
"github.com/jitsucom/jitsu/server/timestamp"
"github.com/panjf2000/ants/v2"
"go.uber.org/atomic"
"io/ioutil"
"math"
"net/http"
"time"
)
//HTTPAdapterConfiguration is a dto for creating HTTPAdapter
type HTTPAdapterConfiguration struct {
DestinationID string
Dir string
HTTPConfig *HTTPConfiguration
HTTPReqFactory HTTPRequestFactory
QueueFactory *events.QueueFactory
PoolWorkers int
DebugLogger *logging.QueryLogger
ErrorHandler func(fallback bool, eventContext *EventContext, err error)
SuccessHandler func(eventContext *EventContext)
}
//HTTPConfiguration is a dto for HTTP adapter (client) configuration
type HTTPConfiguration struct {
GlobalClientTimeout time.Duration
RetryDelay time.Duration
RetryCount int
ClientMaxIdleConns int
ClientMaxIdleConnsPerHost int
QueueFullnessThreshold uint64
}
//HTTPAdapter is an adapter for sending HTTP requests with retries
//has persistent request queue and workers pool under the hood
type HTTPAdapter struct {
client *http.Client
workersPool *ants.PoolWithFunc
queue *HTTPRequestQueue
debugLogger *logging.QueryLogger
httpReqFactory HTTPRequestFactory
errorHandler func(fallback bool, eventContext *EventContext, err error)
successHandler func(eventContext *EventContext)
destinationID string
retryCount int
retryDelay time.Duration
//when reached - requests can't be retried => fallback
queueFullnessThreshold uint64
closed *atomic.Bool
}
//NewHTTPAdapter returns configured HTTPAdapter and starts queue observing goroutine
func NewHTTPAdapter(config *HTTPAdapterConfiguration) (*HTTPAdapter, error) {
httpAdapter := &HTTPAdapter{
client: &http.Client{
Timeout: config.HTTPConfig.GlobalClientTimeout,
Transport: &http.Transport{
MaxIdleConns: config.HTTPConfig.ClientMaxIdleConns,
MaxIdleConnsPerHost: config.HTTPConfig.ClientMaxIdleConnsPerHost,
},
},
debugLogger: config.DebugLogger,
httpReqFactory: config.HTTPReqFactory,
errorHandler: config.ErrorHandler,
successHandler: config.SuccessHandler,
destinationID: config.DestinationID,
retryCount: config.HTTPConfig.RetryCount,
retryDelay: config.HTTPConfig.RetryDelay,
queueFullnessThreshold: config.HTTPConfig.QueueFullnessThreshold,
closed: atomic.NewBool(false),
}
reqQueue := NewHTTPRequestQueue(config.DestinationID, config.QueueFactory)
pool, err := ants.NewPoolWithFunc(config.PoolWorkers, httpAdapter.sendRequestWithRetry)
if err != nil {
return nil, fmt.Errorf("Error creating HTTP adapter workers pool: %v", err)
}
httpAdapter.workersPool = pool
httpAdapter.queue = reqQueue
httpAdapter.startObserver()
return httpAdapter, nil
}
//startObserver run goroutine for polling from the queue and executes Request
func (h *HTTPAdapter) startObserver() {
safego.RunWithRestart(func() {
for {
if h.closed.Load() {
break
}
if h.workersPool.Free() > 0 {
retryableRequest, err := h.queue.DequeueBlock()
if err != nil {
if err == queue.ErrQueueClosed && h.closed.Load() {
continue
}
logging.SystemErrorf("[%s] Error reading HTTP request from the queue: %v", h.destinationID, err)
time.Sleep(time.Second)
continue
}
//dequeued request was from retry call and retry timeout hasn't come
if timestamp.Now().UTC().Before(retryableRequest.DequeuedTime) {
if err := h.queue.AddRequest(retryableRequest); err != nil {
logging.SystemErrorf("[%s] Error enqueueing HTTP request after dequeuing: %v", h.destinationID, err)
h.errorHandler(true, retryableRequest.EventContext, err)
}
continue
}
if err := h.workersPool.Invoke(retryableRequest); err != nil {
if err != ants.ErrPoolClosed {
logging.SystemErrorf("[%s] Error invoking HTTP request task: %v", h.destinationID, err)
}
if err := h.queue.AddRequest(retryableRequest); err != nil {
logging.SystemErrorf("[%s] Error enqueueing HTTP request after invoking: %v", h.destinationID, err)
h.errorHandler(true, retryableRequest.EventContext, err)
}
}
} else {
time.Sleep(time.Millisecond * 50)
}
}
})
}
//SendAsync puts request to the queue
//returns err if can't put to the queue
func (h *HTTPAdapter) SendAsync(eventContext *EventContext) error {
req, err := h.httpReqFactory.Create(eventContext.ProcessedEvent)
if err != nil {
return err
}
return h.queue.Add(req, eventContext)
}
func (h *HTTPAdapter) sendRequestWithRetry(i interface{}) {
retryableRequest, ok := i.(*RetryableRequest)
if !ok {
logging.SystemErrorf("HTTP webhook request has unknown type: %T", i)
return
}
retries := ""
if retryableRequest.Retry > 0 {
retries = fmt.Sprintf(" with %d retry", retryableRequest.Retry)
}
debugQuery := fmt.Sprintf("%s %s. Headers: %v %s", retryableRequest.Request.Method, retryableRequest.Request.URL, retryableRequest.Request.Headers, retries)
h.debugLogger.LogQueryWithValues(debugQuery, []interface{}{string(retryableRequest.Request.Body)})
err := h.doRequest(retryableRequest.Request)
if err != nil {
logging.Errorf("[%s] HTTP request URL: [%s] Method: [%s] Body: [%s] Headers: [%s] will be retried [retry count=%d] after err: %v", h.destinationID, retryableRequest.Request.URL, retryableRequest.Request.Method, string(retryableRequest.Request.Body), retryableRequest.Request.Headers, retryableRequest.Retry, err)
h.doRetry(retryableRequest, err)
} else {
retryableRequest.EventContext.HTTPRequest = retryableRequest.Request
h.successHandler(retryableRequest.EventContext)
}
}
//doRetry retries request.
//without retry if:
// - queue size is greater than threshold
// - retry limit is reached
func (h *HTTPAdapter) doRetry(retryableRequest *RetryableRequest, sendErr error) {
//if queue fullness threshold configured check if queue size not exceed
if h.queueFullnessThreshold == 0 || h.queueFullnessThreshold > h.queue.Size() {
//check retry count and increment exponential 2^X
if retryableRequest.Retry < h.retryCount {
delay := time.Duration(math.Pow(2, float64(retryableRequest.Retry))) * h.retryDelay
retryableRequest.Retry += 1
retryableRequest.DequeuedTime = timestamp.Now().UTC().Add(delay)
if err := h.queue.AddRequest(retryableRequest); err != nil {
logging.SystemErrorf("[%s] Error enqueueing HTTP request after sending: %v", h.destinationID, err)
h.errorHandler(true, retryableRequest.EventContext, sendErr)
} else {
h.errorHandler(false, retryableRequest.EventContext, sendErr)
}
return
}
}
headersJSON, _ := json.Marshal(retryableRequest.Request.Headers)
logging.Errorf("[%s] Error sending HTTP request URL: [%s] Method: [%s] Body: [%s] Headers: [%s]: %v", h.destinationID, retryableRequest.Request.URL, retryableRequest.Request.Method, string(retryableRequest.Request.Body), headersJSON, sendErr)
h.errorHandler(true, retryableRequest.EventContext, sendErr)
}
func (h *HTTPAdapter) doRequest(req *Request) error {
var httpReq *http.Request
var err error
if req.Body != nil && len(req.Body) > 0 {
httpReq, err = http.NewRequest(req.Method, req.URL, bytes.NewReader(req.Body))
} else {
httpReq, err = http.NewRequest(req.Method, req.URL, nil)
}
if err != nil {
return err
}
for header, value := range req.Headers {
httpReq.Header.Add(header, value)
}
resp, err := h.client.Do(httpReq)
if err != nil {
return err
}
if resp != nil && resp.Body != nil {
defer resp.Body.Close()
}
//check HTTP response code
if resp.StatusCode < 200 || resp.StatusCode > 299 {
//read response body
responsePayload := "no HTTP response body"
if resp != nil && resp.Body != nil {
responseBody, err := ioutil.ReadAll(resp.Body)
if err != nil {
responsePayload = fmt.Sprintf("[%s] Error reading HTTP response body: %v", h.destinationID, err)
} else {
responsePayload = string(responseBody)
}
}
headers, _ := json.MarshalIndent(resp.Header, " ", " ")
return fmt.Errorf("HTTP Response status code: [%d],\n\tResponse body: [%s],\n\tResponse headers: [%s]", resp.StatusCode, responsePayload, string(headers))
}
return nil
}
//Close closes underlying queue, workers pool and HTTP client
//returns err if occurred
func (h *HTTPAdapter) Close() (err error) {
h.closed.Store(true)
h.httpReqFactory.Close()
err = h.queue.Close()
h.workersPool.Release()
h.client.CloseIdleConnections()
return err
}