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115 lines
2.8 KiB
115 lines
2.8 KiB
/*
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* MinIO Cloud Storage, (C) 2019 MinIO, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package cmd
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import (
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"bytes"
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"context"
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"encoding/json"
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"strings"
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"sync"
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"github.com/minio/minio/cmd/logger"
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"github.com/minio/minio/pkg/pubsub"
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"github.com/minio/minio/pkg/trace"
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)
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//HTTPTraceSys holds global trace state
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type HTTPTraceSys struct {
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peers []*peerRESTClient
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pubsub *pubsub.PubSub
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}
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// NewTraceSys - creates new HTTPTraceSys with all nodes subscribed to
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// the trace pub sub system
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func NewTraceSys(ctx context.Context, endpoints EndpointList) *HTTPTraceSys {
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remoteHosts := getRemoteHosts(endpoints)
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remoteClients, err := getRestClients(remoteHosts)
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if err != nil {
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logger.FatalIf(err, "Unable to start httptrace sub system")
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}
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ps := pubsub.New()
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return &HTTPTraceSys{
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remoteClients, ps,
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}
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}
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// HasTraceListeners returns true if trace listeners are registered
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// for this node or peers
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func (sys *HTTPTraceSys) HasTraceListeners() bool {
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return sys != nil && sys.pubsub.HasSubscribers()
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}
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// Publish - publishes trace message to the http trace pubsub system
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func (sys *HTTPTraceSys) Publish(traceMsg trace.Info) {
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sys.pubsub.Publish(traceMsg)
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}
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// Trace writes http trace to writer
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func (sys *HTTPTraceSys) Trace(doneCh chan struct{}, trcAll bool) chan []byte {
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traceCh := make(chan []byte)
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go func() {
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defer close(traceCh)
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var wg = &sync.WaitGroup{}
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wg.Add(1)
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go func() {
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defer wg.Done()
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buf := &bytes.Buffer{}
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ch := sys.pubsub.Subscribe()
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defer sys.pubsub.Unsubscribe(ch)
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for {
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select {
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case entry := <-ch:
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trcInfo := entry.(trace.Info)
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path := strings.TrimPrefix(trcInfo.ReqInfo.Path, "/")
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// omit inter-node traffic if trcAll is false
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if !trcAll && strings.HasPrefix(path, minioReservedBucket) {
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continue
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}
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buf.Reset()
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enc := json.NewEncoder(buf)
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enc.SetEscapeHTML(false)
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if err := enc.Encode(trcInfo); err != nil {
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continue
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}
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traceCh <- buf.Bytes()
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case <-doneCh:
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return
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}
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}
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}()
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for _, peer := range sys.peers {
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wg.Add(1)
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go func(peer *peerRESTClient) {
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defer wg.Done()
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ch, err := peer.Trace(doneCh, trcAll)
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if err != nil {
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return
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}
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for entry := range ch {
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traceCh <- entry
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}
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}(peer)
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}
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wg.Wait()
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}()
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return traceCh
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}
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