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ingress_handler.go
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/
ingress_handler.go
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/*
Copyright 2019 The Knative Authors
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 ingress
import (
"context"
"fmt"
"net/http"
"net/url"
"strings"
"time"
opencensusclient "github.com/cloudevents/sdk-go/observability/opencensus/v2/client"
cloudevents "github.com/cloudevents/sdk-go/v2"
"github.com/cloudevents/sdk-go/v2/binding"
"github.com/cloudevents/sdk-go/v2/client"
cehttp "github.com/cloudevents/sdk-go/v2/protocol/http"
"go.opencensus.io/trace"
"go.uber.org/zap"
"k8s.io/apimachinery/pkg/types"
"knative.dev/pkg/network"
"knative.dev/eventing/pkg/apis/eventing"
eventingv1 "knative.dev/eventing/pkg/apis/eventing/v1"
"knative.dev/eventing/pkg/broker"
eventinglisters "knative.dev/eventing/pkg/client/listers/eventing/v1"
"knative.dev/eventing/pkg/kncloudevents"
"knative.dev/eventing/pkg/tracing"
"knative.dev/eventing/pkg/utils"
)
const (
// noDuration signals that the dispatch step hasn't started
noDuration = -1
)
type Handler struct {
// Receiver receives incoming HTTP requests
Receiver *kncloudevents.HTTPMessageReceiver
// Sender sends requests to the broker
Sender *kncloudevents.HTTPMessageSender
// Defaults sets default values to incoming events
Defaulter client.EventDefaulter
// Reporter reports stats of status code and dispatch time
Reporter StatsReporter
// BrokerLister gets broker objects
BrokerLister eventinglisters.BrokerLister
Logger *zap.Logger
}
func (h *Handler) getBroker(name, namespace string) (*eventingv1.Broker, error) {
broker, err := h.BrokerLister.Brokers(namespace).Get(name)
if err != nil {
h.Logger.Warn("Broker getter failed")
return nil, err
}
return broker, nil
}
func guessChannelAddress(name, namespace, domain string) string {
url := url.URL{
Scheme: "http",
Host: fmt.Sprintf("%s-kne-trigger-kn-channel.%s.svc.%s", name, namespace, domain),
Path: "/",
}
return url.String()
}
func (h *Handler) getChannelAddress(name, namespace string) (string, error) {
broker, err := h.getBroker(name, namespace)
if err != nil {
return "", err
}
if broker.Status.Annotations == nil {
return "", fmt.Errorf("Broker status annotations uninitialized")
}
address, present := broker.Status.Annotations[eventing.BrokerChannelAddressStatusAnnotationKey]
if !present {
return "", fmt.Errorf("Channel address not found in broker status annotations")
}
return address, nil
}
func (h *Handler) Start(ctx context.Context) error {
return h.Receiver.StartListen(ctx, h)
}
func (h *Handler) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
writer.Header().Set("Allow", "POST, OPTIONS")
// validate request method
if request.Method == http.MethodOptions {
writer.Header().Set("WebHook-Allowed-Origin", "*") // Accept from any Origin:
writer.Header().Set("WebHook-Allowed-Rate", "*") // Unlimited requests/minute
writer.WriteHeader(http.StatusOK)
return
}
if request.Method != http.MethodPost {
h.Logger.Warn("unexpected request method", zap.String("method", request.Method))
writer.WriteHeader(http.StatusMethodNotAllowed)
return
}
// validate request URI
if request.RequestURI == "/" {
writer.WriteHeader(http.StatusNotFound)
return
}
nsBrokerName := strings.Split(strings.TrimSuffix(request.RequestURI, "/"), "/")
if len(nsBrokerName) != 3 {
h.Logger.Info("Malformed uri", zap.String("URI", request.RequestURI))
writer.WriteHeader(http.StatusBadRequest)
return
}
ctx := request.Context()
message := cehttp.NewMessageFromHttpRequest(request)
defer message.Finish(nil)
event, err := binding.ToEvent(ctx, message)
if err != nil {
h.Logger.Warn("failed to extract event from request", zap.Error(err))
writer.WriteHeader(http.StatusBadRequest)
return
}
// run validation for the extracted event
validationErr := event.Validate()
if validationErr != nil {
h.Logger.Warn("failed to validate extracted event", zap.Error(validationErr))
writer.WriteHeader(http.StatusBadRequest)
return
}
brokerNamespace := nsBrokerName[1]
brokerName := nsBrokerName[2]
brokerNamespacedName := types.NamespacedName{
Name: brokerName,
Namespace: brokerNamespace,
}
ctx, span := trace.StartSpan(ctx, tracing.BrokerMessagingDestination(brokerNamespacedName))
defer span.End()
if span.IsRecordingEvents() {
span.AddAttributes(
tracing.MessagingSystemAttribute,
tracing.MessagingProtocolHTTP,
tracing.BrokerMessagingDestinationAttribute(brokerNamespacedName),
tracing.MessagingMessageIDAttribute(event.ID()),
)
span.AddAttributes(opencensusclient.EventTraceAttributes(event)...)
}
reporterArgs := &ReportArgs{
ns: brokerNamespace,
broker: brokerName,
eventType: event.Type(),
}
statusCode, dispatchTime := h.receive(ctx, request.Header, event, brokerNamespace, brokerName)
if dispatchTime > noDuration {
_ = h.Reporter.ReportEventDispatchTime(reporterArgs, statusCode, dispatchTime)
}
_ = h.Reporter.ReportEventCount(reporterArgs, statusCode)
writer.WriteHeader(statusCode)
}
func (h *Handler) receive(ctx context.Context, headers http.Header, event *cloudevents.Event, brokerNamespace, brokerName string) (int, time.Duration) {
// Setting the extension as a string as the CloudEvents sdk does not support non-string extensions.
event.SetExtension(broker.EventArrivalTime, cloudevents.Timestamp{Time: time.Now()})
if h.Defaulter != nil {
newEvent := h.Defaulter(ctx, *event)
event = &newEvent
}
if ttl, err := broker.GetTTL(event.Context); err != nil || ttl <= 0 {
h.Logger.Debug("dropping event based on TTL status.", zap.Int32("TTL", ttl), zap.String("event.id", event.ID()), zap.Error(err))
return http.StatusBadRequest, noDuration
}
channelAddress, err := h.getChannelAddress(brokerName, brokerNamespace)
if err != nil {
h.Logger.Warn("Failed to get channel address, falling back on guess", zap.Error(err))
channelAddress = guessChannelAddress(brokerName, brokerNamespace, network.GetClusterDomainName())
}
return h.send(ctx, headers, event, channelAddress)
}
func (h *Handler) send(ctx context.Context, headers http.Header, event *cloudevents.Event, target string) (int, time.Duration) {
request, err := h.Sender.NewCloudEventRequestWithTarget(ctx, target)
if err != nil {
h.Logger.Error("failed to create event request.", zap.Error(err))
return http.StatusInternalServerError, noDuration
}
message := binding.ToMessage(event)
defer message.Finish(nil)
additionalHeaders := utils.PassThroughHeaders(headers)
err = kncloudevents.WriteHTTPRequestWithAdditionalHeaders(ctx, message, request, additionalHeaders)
if err != nil {
h.Logger.Error("failed to write request additionalHeaders.", zap.Error(err))
return http.StatusInternalServerError, noDuration
}
resp, dispatchTime, err := h.sendAndRecordDispatchTime(request)
if resp != nil {
defer resp.Body.Close()
}
if err != nil {
h.Logger.Error("failed to dispatch event", zap.Error(err))
return http.StatusInternalServerError, dispatchTime
}
return resp.StatusCode, dispatchTime
}
func (h *Handler) sendAndRecordDispatchTime(request *http.Request) (*http.Response, time.Duration, error) {
start := time.Now()
resp, err := h.Sender.Send(request)
dispatchTime := time.Since(start)
return resp, dispatchTime, err
}