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minio/cmd/listen-notification-handler...

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/*
* MinIO Cloud Storage, (C) 2020 MinIO, Inc.
*
* 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 cmd
import (
"encoding/json"
"net/http"
"time"
"github.com/gorilla/mux"
"github.com/minio/minio/cmd/logger"
policy "github.com/minio/minio/pkg/bucket/policy"
"github.com/minio/minio/pkg/event"
)
func (api objectAPIHandlers) ListenNotificationHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "ListenNotification")
defer logger.AuditLog(w, r, "ListenNotification", mustGetClaimsFromToken(r))
// Validate if bucket exists.
objAPI := api.ObjectAPI()
if objAPI == nil {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL, guessIsBrowserReq(r))
return
}
if !objAPI.IsNotificationSupported() {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL, guessIsBrowserReq(r))
return
}
if !objAPI.IsListenSupported() {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrNotImplemented), r.URL, guessIsBrowserReq(r))
return
}
vars := mux.Vars(r)
bucketName := vars["bucket"]
if bucketName == "" {
if s3Error := checkRequestAuthType(ctx, r, policy.ListenNotificationAction, bucketName, ""); s3Error != ErrNone {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL, guessIsBrowserReq(r))
return
}
} else {
if s3Error := checkRequestAuthType(ctx, r, policy.ListenBucketNotificationAction, bucketName, ""); s3Error != ErrNone {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL, guessIsBrowserReq(r))
return
}
}
values := r.URL.Query()
var prefix string
if len(values[peerRESTListenPrefix]) > 1 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrFilterNamePrefix), r.URL, guessIsBrowserReq(r))
return
}
if len(values[peerRESTListenPrefix]) == 1 {
if err := event.ValidateFilterRuleValue(values[peerRESTListenPrefix][0]); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
prefix = values[peerRESTListenPrefix][0]
}
var suffix string
if len(values[peerRESTListenSuffix]) > 1 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrFilterNameSuffix), r.URL, guessIsBrowserReq(r))
return
}
if len(values[peerRESTListenSuffix]) == 1 {
if err := event.ValidateFilterRuleValue(values[peerRESTListenSuffix][0]); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
suffix = values[peerRESTListenSuffix][0]
}
pattern := event.NewPattern(prefix, suffix)
var eventNames []event.Name
for _, s := range values[peerRESTListenEvents] {
eventName, err := event.ParseName(s)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
eventNames = append(eventNames, eventName)
}
if bucketName != "" {
if _, err := objAPI.GetBucketInfo(ctx, bucketName); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL, guessIsBrowserReq(r))
return
}
}
rulesMap := event.NewRulesMap(eventNames, pattern, event.TargetID{ID: mustGetUUID()})
setEventStreamHeaders(w)
// Listen Publisher and peer-listen-client uses nonblocking send and hence does not wait for slow receivers.
// Use buffered channel to take care of burst sends or slow w.Write()
listenCh := make(chan interface{}, 4000)
peers := newPeerRestClients(globalEndpoints)
globalHTTPListen.Subscribe(listenCh, ctx.Done(), func(evI interface{}) bool {
ev, ok := evI.(event.Event)
if !ok {
return false
}
if ev.S3.Bucket.Name != "" && bucketName != "" {
if ev.S3.Bucket.Name != bucketName {
return false
}
}
return rulesMap.MatchSimple(ev.EventName, ev.S3.Object.Key)
})
for _, peer := range peers {
if peer == nil {
continue
}
peer.Listen(listenCh, ctx.Done(), values)
}
keepAliveTicker := time.NewTicker(500 * time.Millisecond)
defer keepAliveTicker.Stop()
enc := json.NewEncoder(w)
for {
select {
case evI := <-listenCh:
ev := evI.(event.Event)
if len(string(ev.EventName)) > 0 {
if err := enc.Encode(struct{ Records []event.Event }{[]event.Event{ev}}); err != nil {
return
}
} else {
if _, err := w.Write([]byte(" ")); err != nil {
return
}
}
w.(http.Flusher).Flush()
case <-keepAliveTicker.C:
if _, err := w.Write([]byte(" ")); err != nil {
return
}
w.(http.Flusher).Flush()
case <-ctx.Done():
return
}
}
}