minio/cmd/notify-webhook.go

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/*
* Minio Cloud Storage, (C) 2016, 2017 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 cmd
import (
"crypto/tls"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"time"
"github.com/Sirupsen/logrus"
)
type webhookNotify struct {
Enable bool `json:"enable"`
Endpoint string `json:"endpoint"`
}
func (w *webhookNotify) Validate() error {
if !w.Enable {
return nil
}
if _, err := checkURL(w.Endpoint); err != nil {
return err
}
return nil
}
type httpConn struct {
*http.Client
Endpoint string
}
// Lookup endpoint address by successfully dialing.
func lookupEndpoint(u *url.URL) error {
dialer := &net.Dialer{
Timeout: 300 * time.Millisecond,
KeepAlive: 300 * time.Millisecond,
}
nconn, err := dialer.Dial("tcp", canonicalAddr(u))
if err != nil {
return err
}
return nconn.Close()
}
// Initializes new webhook logrus notifier.
func newWebhookNotify(accountID string) (*logrus.Logger, error) {
rNotify := serverConfig.Notify.GetWebhookByID(accountID)
if rNotify.Endpoint == "" {
return nil, errInvalidArgument
}
u, err := url.Parse(rNotify.Endpoint)
if err != nil {
return nil, err
}
if err = lookupEndpoint(u); err != nil {
return nil, err
}
conn := httpConn{
// Configure aggressive timeouts for client posts.
Client: &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{RootCAs: globalRootCAs},
DialContext: (&net.Dialer{
Timeout: 5 * time.Second,
KeepAlive: 5 * time.Second,
}).DialContext,
TLSHandshakeTimeout: 3 * time.Second,
ResponseHeaderTimeout: 3 * time.Second,
ExpectContinueTimeout: 2 * time.Second,
},
},
Endpoint: rNotify.Endpoint,
}
notifyLog := logrus.New()
notifyLog.Out = ioutil.Discard
// Set default JSON formatter.
notifyLog.Formatter = new(logrus.JSONFormatter)
notifyLog.Hooks.Add(conn)
// Success
return notifyLog, nil
}
// Fire is called when an event should be sent to the message broker.
func (n httpConn) Fire(entry *logrus.Entry) error {
body, err := entry.Reader()
if err != nil {
return err
}
req, err := http.NewRequest("POST", n.Endpoint, body)
if err != nil {
return err
}
// Set content-type.
req.Header.Set("Content-Type", "application/json")
// Set proper server user-agent.
req.Header.Set("User-Agent", globalServerUserAgent)
// Initiate the http request.
resp, err := n.Do(req)
if err != nil {
return err
}
// Make sure to close the response body so the connection can be re-used.
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK &&
resp.StatusCode != http.StatusAccepted &&
resp.StatusCode != http.StatusContinue {
return fmt.Errorf("Unable to send event %s", resp.Status)
}
return nil
}
// Levels are Required for logrus hook implementation
func (httpConn) Levels() []logrus.Level {
return []logrus.Level{
logrus.InfoLevel,
}
}