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92 lines
2.2 KiB
92 lines
2.2 KiB
/*
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* Minio Cloud Storage, (C) 2018 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 logger
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import (
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"bytes"
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"encoding/json"
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"errors"
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"io"
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"io/ioutil"
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"net/http"
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)
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// HTTPTarget implements loggerTarget and sends the json
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// format of a log entry to the configured http endpoint.
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// An internal buffer of logs is maintained but when the
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// buffer is full, new logs are just ignored and an error
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// is returned to the caller.
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type HTTPTarget struct {
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// Channel of log entries
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logCh chan logEntry
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// HTTP(s) endpoint
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endpoint string
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client http.Client
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}
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func (h *HTTPTarget) startHTTPLogger() {
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// Create a routine which sends json logs received
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// from an internal channel.
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go func() {
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for entry := range h.logCh {
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logJSON, err := json.Marshal(&entry)
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if err != nil {
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continue
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}
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req, err := http.NewRequest("POST", h.endpoint, bytes.NewBuffer(logJSON))
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req.Header.Set("Content-Type", "application/json")
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resp, err := h.client.Do(req)
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if err != nil {
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continue
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}
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if resp.Body != nil {
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buf := make([]byte, 512)
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io.CopyBuffer(ioutil.Discard, resp.Body, buf)
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resp.Body.Close()
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}
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}
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}()
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}
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// NewHTTP initializes a new logger target which
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// sends log over http to the specified endpoint
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func NewHTTP(endpoint string, transport *http.Transport) LoggingTarget {
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h := HTTPTarget{
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endpoint: endpoint,
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client: http.Client{
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Transport: transport,
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},
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logCh: make(chan logEntry, 10000),
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}
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h.startHTTPLogger()
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return &h
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}
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func (h *HTTPTarget) send(entry logEntry) error {
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select {
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case h.logCh <- entry:
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default:
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// log channel is full, do not wait and return
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// an error immediately to the caller
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return errors.New("log buffer full")
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}
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return nil
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}
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