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93 lines
2.4 KiB
93 lines
2.4 KiB
6 years ago
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/*
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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 madmin
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import (
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"bufio"
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"encoding/json"
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"io"
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"net/http"
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"net/url"
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"strconv"
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trace "github.com/minio/minio/pkg/trace"
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)
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// TraceInfo holds http trace
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type TraceInfo struct {
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Trace trace.Info
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Err error `json:"-"`
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}
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// Trace - listen on http trace notifications.
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func (adm AdminClient) Trace(allTrace bool, doneCh <-chan struct{}) <-chan TraceInfo {
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traceInfoCh := make(chan TraceInfo, 1)
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// Only success, start a routine to start reading line by line.
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go func(traceInfoCh chan<- TraceInfo) {
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defer close(traceInfoCh)
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for {
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urlValues := make(url.Values)
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urlValues.Set("all", strconv.FormatBool(allTrace))
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reqData := requestData{
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relPath: "/v1/trace",
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queryValues: urlValues,
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}
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// Execute GET to call trace handler
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resp, err := adm.executeMethod("GET", reqData)
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if err != nil {
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closeResponse(resp)
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return
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}
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if resp.StatusCode != http.StatusOK {
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traceInfoCh <- TraceInfo{Err: httpRespToErrorResponse(resp)}
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return
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}
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// Initialize a new bufio scanner, to read line by line.
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bio := bufio.NewScanner(resp.Body)
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// Close the response body.
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defer resp.Body.Close()
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// Unmarshal each line, returns marshaled values.
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for bio.Scan() {
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var traceRec trace.Info
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if err = json.Unmarshal(bio.Bytes(), &traceRec); err != nil {
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continue
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}
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select {
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case <-doneCh:
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return
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case traceInfoCh <- TraceInfo{Trace: traceRec}:
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}
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}
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// Look for any underlying errors.
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if err = bio.Err(); err != nil {
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// For an unexpected connection drop from server, we close the body
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// and re-connect.
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if err == io.ErrUnexpectedEOF {
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resp.Body.Close()
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}
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}
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}
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}(traceInfoCh)
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// Returns the trace info channel, for caller to start reading from.
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return traceInfoCh
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}
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