136 lines
3.2 KiB
Go
136 lines
3.2 KiB
Go
/*
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Copyright 2016 The Fission Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 kubewatcher
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import (
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"bytes"
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"io/ioutil"
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"log"
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"net/http"
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"reflect"
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"strings"
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"time"
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"k8s.io/client-go/1.5/pkg/watch"
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)
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type (
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// A webhook publisher for a single URL. Satisifies the Publisher interface.
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WebhookPublisher struct {
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requestChannel chan *publishRequest
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maxRetries int
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retryDelay time.Duration
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baseUrl string
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}
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publishRequest struct {
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url string
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watchEvent watch.Event
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retries int
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retryDelay time.Duration
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}
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)
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func MakeWebhookPublisher(baseUrl string) *WebhookPublisher {
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p := &WebhookPublisher{
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baseUrl: baseUrl,
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requestChannel: make(chan *publishRequest, 32), // buffered channel
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// TODO make this configurable
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maxRetries: 10,
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retryDelay: 500 * time.Millisecond,
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}
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go p.svc()
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return p
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}
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func (p *WebhookPublisher) Publish(watchEvent watch.Event, url string) {
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p.requestChannel <- &publishRequest{
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watchEvent: watchEvent,
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url: url,
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retries: p.maxRetries,
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retryDelay: p.retryDelay,
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}
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}
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func (p *WebhookPublisher) svc() {
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for {
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r := <-p.requestChannel
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p.makeHttpRequest(r)
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}
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}
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func (p *WebhookPublisher) makeHttpRequest(r *publishRequest) {
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url := p.baseUrl + "/" + strings.TrimPrefix(r.url, "/")
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log.Printf("Making HTTP request to %v", url)
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// Serialize the object
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var buf bytes.Buffer
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err := printKubernetesObject(r.watchEvent.Object, &buf)
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if err != nil {
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log.Println("Failed to serialize object: %v", err)
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// TODO send a POST request indicating error
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}
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// Create request
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req, err := http.NewRequest("POST", url, &buf)
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if err != nil {
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log.Printf("Failed to create request to %v", url)
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// can't do anything more, drop the event.
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return
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}
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// Event and object type aren't in the serialized object
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req.Header.Add("Content-Type", "application/json")
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req.Header.Add("X-Kubernetes-Event-Type", string(r.watchEvent.Type))
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req.Header.Add("X-Kubernetes-Object-Type", reflect.TypeOf(r.watchEvent.Object).Elem().Name())
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// Make the request
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resp, err := http.DefaultClient.Do(req)
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// All done if the request succeeded with 200 OK.
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if err == nil && resp.StatusCode == 200 {
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resp.Body.Close()
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return
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}
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// Log errors
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if err != nil {
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log.Printf("Request failed: %v", r)
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} else if resp.StatusCode != 200 {
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log.Printf("Request returned failure: %v", resp.StatusCode)
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body, err := ioutil.ReadAll(resp.Body)
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resp.Body.Close()
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if err == nil {
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log.Printf("request error: %v", string(body))
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}
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}
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// Schedule a retry, or give up if out of retries
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r.retries--
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if r.retries > 0 {
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r.retryDelay *= time.Duration(2)
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time.AfterFunc(r.retryDelay, func() {
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p.requestChannel <- r
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})
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} else {
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log.Printf("Final retry failed, giving up on %v", url)
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// Event dropped
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}
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}
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