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Copy pathhttp.go
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94 lines (83 loc) · 2.25 KB
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/*
* Minio Cloud Storage, (C) 2018 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 http
import (
"bytes"
"encoding/json"
"errors"
"io"
"io/ioutil"
gohttp "net/http"
)
// Target implements logger.Target and sends the json
// format of a log entry to the configured http endpoint.
// An internal buffer of logs is maintained but when the
// buffer is full, new logs are just ignored and an error
// is returned to the caller.
type Target struct {
// Channel of log entries
logCh chan interface{}
// HTTP(s) endpoint
endpoint string
client gohttp.Client
}
func (h *Target) startHTTPLogger() {
// Create a routine which sends json logs received
// from an internal channel.
go func() {
for entry := range h.logCh {
logJSON, err := json.Marshal(&entry)
if err != nil {
continue
}
req, err := gohttp.NewRequest("POST", h.endpoint, bytes.NewBuffer(logJSON))
req.Header.Set("Content-Type", "application/json")
resp, err := h.client.Do(req)
if err != nil {
continue
}
if resp.Body != nil {
buf := make([]byte, 512)
io.CopyBuffer(ioutil.Discard, resp.Body, buf)
resp.Body.Close()
}
}
}()
}
// New initializes a new logger target which
// sends log over http to the specified endpoint
func New(endpoint string, transport *gohttp.Transport) *Target {
h := Target{
endpoint: endpoint,
client: gohttp.Client{
Transport: transport,
},
logCh: make(chan interface{}, 10000),
}
h.startHTTPLogger()
return &h
}
// Send log message 'e' to http target.
func (h *Target) Send(entry interface{}) error {
select {
case h.logCh <- entry:
default:
// log channel is full, do not wait and return
// an error immediately to the caller
return errors.New("log buffer full")
}
return nil
}