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Harshavardhana b0c9ae7490 Add audit logging for S3 and Web handlers ()
This PR brings an additional logger implementation
called AuditLog which logs to http targets

The intention is to use AuditLog to log all incoming
requests, this is used as a mechanism by external log
collection entities for processing Minio requests.
2018-10-12 12:25:59 -07:00

94 lines
2.2 KiB
Go

/*
* 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 logger
import (
"bytes"
"encoding/json"
"errors"
"io"
"io/ioutil"
"net/http"
)
// HTTPTarget implements loggerTarget 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 HTTPTarget struct {
// Channel of log entries
logCh chan interface{}
// HTTP(s) endpoint
endpoint string
client http.Client
}
func (h *HTTPTarget) 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 := http.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()
}
}
}()
}
// NewHTTP initializes a new logger target which
// sends log over http to the specified endpoint
func NewHTTP(endpoint string, transport *http.Transport) LoggingTarget {
h := HTTPTarget{
endpoint: endpoint,
client: http.Client{
Transport: transport,
},
logCh: make(chan interface{}, 10000),
}
h.startHTTPLogger()
return &h
}
func (h *HTTPTarget) 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
}