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notification.go
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notification.go
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// Copyright (c) 2016-2019 Uber Technologies, 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 main
import (
"encoding/json"
"net/http"
"os"
"time"
"github.com/docker/distribution/notifications"
"github.com/uber/kraken/utils/log"
)
const (
baseManifestQuery = "http://%s/v2/%s/manifests/%s"
baseLayerQuery = "http://%s/v2/%s/blobs/%s"
transferTimeout = 120 * time.Second
localSource = "localhost:5051"
tempDir = "/tmp/kraken/tmp/puller/"
)
// HealthHandler tells haproxy we'fre still alive
func HealthHandler(w http.ResponseWriter, request *http.Request) {
w.Header().Set("Content-Type", "text/plain")
w.Write([]byte("OK"))
}
// NotificationHandler receives docker push notification
type NotificationHandler struct {
queue chan uint8
useDocker bool
}
// NewNotificationHandler creates a new Notifaction
func NewNotificationHandler(maxChanSize int, useDocker bool) (*NotificationHandler, error) {
if err := os.MkdirAll(tempDir, 0775); err != nil {
return nil, err
}
return &NotificationHandler{
queue: make(chan byte, maxChanSize),
useDocker: useDocker,
}, nil
}
// Handler handles messages defined in http://godoc.org/github.com/docker/distribution/notifications.
func (n *NotificationHandler) Handler(w http.ResponseWriter, r *http.Request) {
log.Debugf("notification received")
decoder := json.NewDecoder(r.Body)
var envelope notifications.Envelope
if err := decoder.Decode(&envelope); err != nil {
log.With("err", err).Error("cannot decode envelope")
return
}
for _, event := range envelope.Events {
if event.Action == notifications.EventActionPush {
url := event.Target.URL
repo := event.Target.Repository
tag := event.Target.Tag
digest := guessDigest(url, repo)
if len(digest) == 0 {
log.Debugf("non tag push action: target.URL: '%s', target.Repository: '%s'", url, repo)
} else {
select {
case n.queue <- 'c':
time.Sleep(2 * time.Second)
go func() {
PullImage(localSource, repo, tag, n.useDocker)
<-n.queue
}()
default:
// drop if queue full
log.Infof("queue full. drop %s:%s", repo, tag)
}
}
}
}
w.Header().Set("Content-Type", "application/json")
resString := "OK"
w.Write([]byte(resString))
}