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Connector.go
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Connector.go
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/*
* Copyright (c) 2020 Devtron Labs
*
* 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 connector
import (
"encoding/json"
"fmt"
"github.com/argoproj/argo-cd/pkg/apiclient/application"
"github.com/devtron-labs/devtron/api/bean"
"github.com/gogo/protobuf/proto"
"github.com/grpc-ecosystem/grpc-gateway/runtime"
"github.com/juju/errors"
"go.uber.org/zap"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"io"
"net/http"
"strconv"
"sync"
"time"
)
var delimiter = []byte("\n\n")
type Pump interface {
StartStream(w http.ResponseWriter, recv func() (proto.Message, error), err error)
StartStreamWithHeartBeat(w http.ResponseWriter, isReconnect bool, recv func() (*application.LogEntry, error), err error)
StartMessage(w http.ResponseWriter, resp proto.Message, perr error)
}
type PumpImpl struct {
logger *zap.SugaredLogger
}
func NewPumpImpl(logger *zap.SugaredLogger) *PumpImpl {
return &PumpImpl{
logger: logger,
}
}
func (impl PumpImpl) StartStreamWithHeartBeat(w http.ResponseWriter, isReconnect bool, recv func() (*application.LogEntry, error), err error) {
f, ok := w.(http.Flusher)
if !ok {
http.Error(w, "unexpected server doesnt support streaming", http.StatusInternalServerError)
}
if err != nil {
http.Error(w, errors.Details(err), http.StatusInternalServerError)
}
w.Header().Set("Transfer-Encoding", "chunked")
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("X-Accel-Buffering", "no")
w.Header().Set("X-Content-Type-Options", "nosniff")
var wroteHeader bool
if isReconnect {
err := impl.sendEvent(nil, []byte("RECONNECT_STREAM"), []byte("RECONNECT_STREAM"), w)
if err != nil {
impl.logger.Errorw("error in writing data over sse", "err", err)
return
}
}
// heartbeat start
ticker := time.NewTicker(30 * time.Second)
done := make(chan bool)
var mux sync.Mutex
go func() error {
for {
select {
case <-done:
return nil
case t := <-ticker.C:
mux.Lock()
err := impl.sendEvent(nil, []byte("PING"), []byte(t.String()), w)
mux.Unlock()
if err != nil {
impl.logger.Errorw("error in writing PING over sse", "err", err)
return err
}
f.Flush()
}
}
}()
defer func() {
ticker.Stop()
done <- true
}()
// heartbeat end
for {
resp, err := recv()
if err == io.EOF {
return
}
if err != nil {
impl.logger.Errorf("Error occurred while reading data from argocd %+v\n", err)
impl.handleForwardResponseStreamError(wroteHeader, w, err)
return
}
response := bean.Response{}
response.Result = resp
buf, err := json.Marshal(response)
if err != nil {
impl.logger.Errorw("error in marshaling data", "err", err)
return
}
mux.Lock()
err = impl.sendEvent([]byte(strconv.FormatInt(resp.GetTimeStamp().UnixNano(), 10)), nil, buf, w)
mux.Unlock()
if err != nil {
impl.logger.Errorw("error in writing data over sse", "err", err)
return
}
wroteHeader = true
f.Flush()
}
}
func (impl *PumpImpl) sendEvent(eventId []byte, eventName []byte, payload []byte, w http.ResponseWriter) error {
var res []byte
if len(eventId) > 0 {
res = append(res, "id: "...)
res = append(res, eventId...)
res = append(res, '\n')
}
if len(eventName) > 0 {
res = append(res, "event:"...)
res = append(res, eventName...)
res = append(res, '\n')
}
if len(payload) > 0 {
res = append(res, "data:"...)
res = append(res, payload...)
}
res = append(res, '\n', '\n')
if i, err := w.Write(res); err != nil {
impl.logger.Errorf("Failed to send response chunk: %v", err)
return err
} else {
impl.logger.Debugw("msg written", "count", i)
}
return nil
}
func (impl PumpImpl) StartStream(w http.ResponseWriter, recv func() (proto.Message, error), err error) {
f, ok := w.(http.Flusher)
if !ok {
http.Error(w, "unexpected server doesnt support streaming", http.StatusInternalServerError)
}
if err != nil {
http.Error(w, errors.Details(err), http.StatusInternalServerError)
}
w.Header().Set("Transfer-Encoding", "chunked")
w.Header().Set("Content-Type", "text/event-stream")
w.Header().Set("X-Accel-Buffering", "no")
w.Header().Set("X-Content-Type-Options", "nosniff")
var wroteHeader bool
for {
resp, err := recv()
if err == io.EOF {
return
}
if err != nil {
impl.logger.Errorf("Error occurred while reading data from argocd %+v\n", err)
impl.handleForwardResponseStreamError(wroteHeader, w, err)
return
}
response := bean.Response{}
response.Result = resp
buf, err := json.Marshal(response)
data := "data: " + string(buf)
if _, err = w.Write([]byte(data)); err != nil {
impl.logger.Errorf("Failed to send response chunk: %v", err)
return
}
wroteHeader = true
if _, err = w.Write(delimiter); err != nil {
impl.logger.Errorf("Failed to send delimiter chunk: %v", err)
return
}
f.Flush()
}
}
func (impl PumpImpl) handleForwardResponseStreamError(wroteHeader bool, w http.ResponseWriter, err error) {
code := "000"
if !wroteHeader {
s, ok := status.FromError(err)
if !ok {
s = status.New(codes.Unknown, err.Error())
}
w.WriteHeader(runtime.HTTPStatusFromCode(s.Code()))
code = fmt.Sprint(s.Code())
}
response := bean.Response{}
apiErr := bean.ApiError{}
apiErr.Code = code // 000=unknown
apiErr.InternalMessage = errors.Details(err)
response.Errors = []bean.ApiError{apiErr}
buf, merr := json.Marshal(response)
if merr != nil {
impl.logger.Errorf("Failed to marshal response %+v\n", merr)
}
if _, werr := w.Write(buf); werr != nil {
impl.logger.Errorf("Failed to notify error to client: %v", werr)
return
}
}
func (impl PumpImpl) StartMessage(w http.ResponseWriter, resp proto.Message, perr error) {
//w.Header().Set("Transfer-Encoding", "chunked")
w.Header().Set("Content-Type", "application/json")
response := bean.Response{}
if perr != nil {
impl.handleForwardResponseMessageError(w, perr)
return
}
var buf []byte
var err error
if rb, ok := resp.(responseBody); ok {
response.Result = rb.XXX_ResponseBody()
buf, err = json.Marshal(response)
} else {
response.Result = resp
buf, err = json.Marshal(response)
}
if err != nil {
impl.logger.Errorf("Marshal error: %v", err)
return
}
if _, err = w.Write(buf); err != nil {
impl.logger.Errorf("Failed to write response: %v", err)
}
}
func (impl PumpImpl) handleForwardResponseMessageError(w http.ResponseWriter, err error) {
code := "000"
s, ok := status.FromError(err)
if !ok {
s = status.New(codes.Unknown, err.Error())
}
w.WriteHeader(runtime.HTTPStatusFromCode(s.Code()))
code = fmt.Sprint(s.Code())
response := bean.Response{}
apiErr := bean.ApiError{}
apiErr.Code = code // 000=unknown
apiErr.InternalMessage = errors.Details(err)
response.Errors = []bean.ApiError{apiErr}
buf, merr := json.Marshal(response)
if merr != nil {
impl.logger.Errorf("Failed to marshal response %+v\n", merr)
}
if _, werr := w.Write(buf); werr != nil {
impl.logger.Errorf("Failed to notify error to client: %v", werr)
return
}
}
type responseBody interface {
XXX_ResponseBody() interface{}
}