/
listen-notification-handlers.go
220 lines (195 loc) · 5.99 KB
/
listen-notification-handlers.go
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// Copyright (c) 2015-2023 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package cmd
import (
"bytes"
"encoding/json"
"net/http"
"strconv"
"time"
"github.com/minio/minio/internal/event"
"github.com/minio/minio/internal/grid"
"github.com/minio/minio/internal/logger"
"github.com/minio/minio/internal/pubsub"
"github.com/minio/mux"
"github.com/minio/pkg/v2/policy"
)
func (api objectAPIHandlers) ListenNotificationHandler(w http.ResponseWriter, r *http.Request) {
ctx := newContext(r, w, "ListenNotification")
defer logger.AuditLog(ctx, w, r, mustGetClaimsFromToken(r))
// Validate if bucket exists.
objAPI := api.ObjectAPI()
if objAPI == nil {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrServerNotInitialized), r.URL)
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)
return
}
} else {
if s3Error := checkRequestAuthType(ctx, r, policy.ListenBucketNotificationAction, bucketName, ""); s3Error != ErrNone {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
return
}
}
values := r.Form
var prefix string
if len(values[peerRESTListenPrefix]) > 1 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrFilterNamePrefix), r.URL)
return
}
if len(values[peerRESTListenPrefix]) == 1 {
if err := event.ValidateFilterRuleValue(values[peerRESTListenPrefix][0]); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
prefix = values[peerRESTListenPrefix][0]
}
var suffix string
if len(values[peerRESTListenSuffix]) > 1 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrFilterNameSuffix), r.URL)
return
}
if len(values[peerRESTListenSuffix]) == 1 {
if err := event.ValidateFilterRuleValue(values[peerRESTListenSuffix][0]); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
suffix = values[peerRESTListenSuffix][0]
}
pattern := event.NewPattern(prefix, suffix)
var eventNames []event.Name
var mask pubsub.Mask
for _, s := range values[peerRESTListenEvents] {
eventName, err := event.ParseName(s)
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
mask.MergeMaskable(eventName)
eventNames = append(eventNames, eventName)
}
if bucketName != "" {
if _, err := objAPI.GetBucketInfo(ctx, bucketName, BucketOptions{}); err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
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()
mergeCh := make(chan []byte, globalAPIConfig.getRequestsPoolCapacity()*len(globalEndpoints.Hostnames()))
localCh := make(chan event.Event, globalAPIConfig.getRequestsPoolCapacity())
// Convert local messages to JSON and send to mergeCh
go func() {
buf := bytes.NewBuffer(grid.GetByteBuffer()[:0])
enc := json.NewEncoder(buf)
tmpEvt := struct{ Records []event.Event }{[]event.Event{{}}}
for {
select {
case ev := <-localCh:
buf.Reset()
tmpEvt.Records[0] = ev
if err := enc.Encode(tmpEvt); err != nil {
logger.LogOnceIf(ctx, err, "event: Encode failed")
continue
}
mergeCh <- append(grid.GetByteBuffer()[:0], buf.Bytes()...)
case <-ctx.Done():
grid.PutByteBuffer(buf.Bytes())
return
}
}
}()
peers, _ := newPeerRestClients(globalEndpoints)
err := globalHTTPListen.Subscribe(mask, localCh, ctx.Done(), func(ev event.Event) bool {
if ev.S3.Bucket.Name != "" && bucketName != "" {
if ev.S3.Bucket.Name != bucketName {
return false
}
}
return rulesMap.MatchSimple(ev.EventName, ev.S3.Object.Key)
})
if err != nil {
writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
return
}
if bucketName != "" {
values.Set(peerRESTListenBucket, bucketName)
}
for _, peer := range peers {
if peer == nil {
continue
}
peer.Listen(ctx, mergeCh, values)
}
var (
emptyEventTicker <-chan time.Time
keepAliveTicker <-chan time.Time
)
if p := values.Get("ping"); p != "" {
pingInterval, err := strconv.Atoi(p)
if err != nil {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidQueryParams), r.URL)
return
}
if pingInterval < 1 {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrInvalidQueryParams), r.URL)
return
}
t := time.NewTicker(time.Duration(pingInterval) * time.Second)
defer t.Stop()
emptyEventTicker = t.C
} else {
// Deprecated Apr 2023
t := time.NewTicker(500 * time.Millisecond)
defer t.Stop()
keepAliveTicker = t.C
}
enc := json.NewEncoder(w)
for {
select {
case ev := <-mergeCh:
_, err := w.Write(ev)
if err != nil {
return
}
if len(mergeCh) == 0 {
// Flush if nothing is queued
w.(http.Flusher).Flush()
}
grid.PutByteBuffer(ev)
case <-emptyEventTicker:
if err := enc.Encode(struct{ Records []event.Event }{}); err != nil {
return
}
w.(http.Flusher).Flush()
case <-keepAliveTicker:
if _, err := w.Write([]byte(" ")); err != nil {
return
}
w.(http.Flusher).Flush()
case <-ctx.Done():
return
}
}
}