Ta-Ching ChenandGitHub
cf2d35291e
1. The records are stored in redis which is not migratable to another cluster for the testing purposes. 2. Some of the requests fields are not recorded. 3. People should consider using https://github.com/buger/goreplay which is an existing mature and well-tested solution for testing purposes.
318 lines
11 KiB
Go
318 lines
11 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 router
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import (
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"context"
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"net/http"
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"time"
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"github.com/gorilla/mux"
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"go.uber.org/zap"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/rest"
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k8sCache "k8s.io/client-go/tools/cache"
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fv1 "github.com/fission/fission/pkg/apis/fission.io/v1"
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"github.com/fission/fission/pkg/crd"
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executorClient "github.com/fission/fission/pkg/executor/client"
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"github.com/fission/fission/pkg/throttler"
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"github.com/fission/fission/pkg/utils"
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)
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type HTTPTriggerSet struct {
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*functionServiceMap
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*mutableRouter
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logger *zap.Logger
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fissionClient *crd.FissionClient
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kubeClient *kubernetes.Clientset
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executor *executorClient.Client
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resolver *functionReferenceResolver
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crdClient *rest.RESTClient
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triggers []fv1.HTTPTrigger
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triggerStore k8sCache.Store
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triggerController k8sCache.Controller
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functions []fv1.Function
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funcStore k8sCache.Store
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funcController k8sCache.Controller
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updateRouterRequestChannel chan struct{}
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tsRoundTripperParams *tsRoundTripperParams
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isDebugEnv bool
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svcAddrUpdateThrottler *throttler.Throttler
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}
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func makeHTTPTriggerSet(logger *zap.Logger, fmap *functionServiceMap, fissionClient *crd.FissionClient,
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kubeClient *kubernetes.Clientset, executor *executorClient.Client, crdClient *rest.RESTClient, params *tsRoundTripperParams, isDebugEnv bool, actionThrottler *throttler.Throttler) (*HTTPTriggerSet, k8sCache.Store, k8sCache.Store) {
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httpTriggerSet := &HTTPTriggerSet{
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logger: logger.Named("http_trigger_set"),
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functionServiceMap: fmap,
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triggers: []fv1.HTTPTrigger{},
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fissionClient: fissionClient,
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kubeClient: kubeClient,
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executor: executor,
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crdClient: crdClient,
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updateRouterRequestChannel: make(chan struct{}, 10), // use buffer channel
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tsRoundTripperParams: params,
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isDebugEnv: isDebugEnv,
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svcAddrUpdateThrottler: actionThrottler,
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}
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var tStore, fnStore k8sCache.Store
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var tController, fnController k8sCache.Controller
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if httpTriggerSet.crdClient != nil {
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tStore, tController = httpTriggerSet.initTriggerController()
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httpTriggerSet.triggerStore = tStore
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httpTriggerSet.triggerController = tController
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fnStore, fnController = httpTriggerSet.initFunctionController()
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httpTriggerSet.funcStore = fnStore
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httpTriggerSet.funcController = fnController
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}
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return httpTriggerSet, tStore, fnStore
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}
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func (ts *HTTPTriggerSet) subscribeRouter(ctx context.Context, mr *mutableRouter, resolver *functionReferenceResolver) {
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ts.resolver = resolver
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ts.mutableRouter = mr
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if ts.fissionClient == nil {
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// Used in tests only.
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mr.updateRouter(ts.getRouter(nil))
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ts.logger.Info("skipping continuous trigger updates")
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return
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}
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go ts.updateRouter()
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go ts.syncTriggers()
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go ts.runWatcher(ctx, ts.funcController)
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go ts.runWatcher(ctx, ts.triggerController)
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}
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func defaultHomeHandler(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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}
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func routerHealthHandler(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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}
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func (ts *HTTPTriggerSet) getRouter(fnTimeoutMap map[types.UID]int) *mux.Router {
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muxRouter := mux.NewRouter()
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// HTTP triggers setup by the user
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homeHandled := false
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for i := range ts.triggers {
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trigger := ts.triggers[i]
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// resolve function reference
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rr, err := ts.resolver.resolve(trigger)
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if err != nil {
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// Unresolvable function reference. Report the error via
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// the trigger's status.
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go ts.updateTriggerStatusFailed(&trigger, err)
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// Ignore this route and let it 404.
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continue
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}
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if rr.resolveResultType != resolveResultSingleFunction && rr.resolveResultType != resolveResultMultipleFunctions {
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// not implemented yet
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ts.logger.Panic("resolve result type not implemented", zap.Any("type", rr.resolveResultType))
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}
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fh := &functionHandler{
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logger: ts.logger.Named(trigger.Metadata.Name),
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fmap: ts.functionServiceMap,
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executor: ts.executor,
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httpTrigger: &trigger,
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functionMetadataMap: rr.functionMetadataMap,
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fnWeightDistributionList: rr.functionWtDistributionList,
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tsRoundTripperParams: ts.tsRoundTripperParams,
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isDebugEnv: ts.isDebugEnv,
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svcAddrUpdateThrottler: ts.svcAddrUpdateThrottler,
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functionTimeoutMap: fnTimeoutMap,
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}
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// The functionHandler for HTTP trigger with fn reference type "FunctionReferenceTypeFunctionName",
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// it's function metadata is set here.
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// The functionHandler For HTTP trigger with fn reference type "FunctionReferenceTypeFunctionWeights",
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// it's function metadata is decided dynamically before proxying the request in order to support canary
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// deployment. For more details, please check "handler" function of functionHandler.
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if rr.resolveResultType == resolveResultSingleFunction {
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for _, metadata := range fh.functionMetadataMap {
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fh.function = metadata
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}
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}
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ht := muxRouter.HandleFunc(trigger.Spec.RelativeURL, fh.handler)
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ht.Methods(trigger.Spec.Method)
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if trigger.Spec.Host != "" {
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ht.Host(trigger.Spec.Host)
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}
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if trigger.Spec.RelativeURL == "/" && trigger.Spec.Method == "GET" {
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homeHandled = true
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}
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}
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if !homeHandled {
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//
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// This adds a no-op handler that returns 200-OK to make sure that the
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// "GET /" request succeeds. This route is used by GKE Ingress (and
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// perhaps other ingress implementations) as a health check, so we don't
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// want it to be a 404 even if the user doesn't have a function mapped to
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// this route.
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//
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muxRouter.HandleFunc("/", defaultHomeHandler).Methods("GET")
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}
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// Internal triggers for each function by name. Non-http
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// triggers route into these.
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for _, function := range ts.functions {
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m := function.Metadata
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fh := &functionHandler{
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logger: ts.logger.Named(m.Name),
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fmap: ts.functionServiceMap,
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function: &m,
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executor: ts.executor,
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tsRoundTripperParams: ts.tsRoundTripperParams,
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isDebugEnv: ts.isDebugEnv,
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svcAddrUpdateThrottler: ts.svcAddrUpdateThrottler,
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functionTimeoutMap: fnTimeoutMap,
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}
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muxRouter.HandleFunc(utils.UrlForFunction(function.Metadata.Name, function.Metadata.Namespace), fh.handler)
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}
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// Healthz endpoint for the router.
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muxRouter.HandleFunc("/router-healthz", routerHealthHandler).Methods("GET")
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return muxRouter
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}
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func (ts *HTTPTriggerSet) updateTriggerStatusFailed(ht *fv1.HTTPTrigger, err error) {
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// TODO
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}
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func (ts *HTTPTriggerSet) initTriggerController() (k8sCache.Store, k8sCache.Controller) {
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resyncPeriod := 30 * time.Second
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listWatch := k8sCache.NewListWatchFromClient(ts.crdClient, "httptriggers", metav1.NamespaceAll, fields.Everything())
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store, controller := k8sCache.NewInformer(listWatch, &fv1.HTTPTrigger{}, resyncPeriod,
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k8sCache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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trigger := obj.(*fv1.HTTPTrigger)
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go createIngress(ts.logger, trigger, ts.kubeClient)
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ts.syncTriggers()
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},
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DeleteFunc: func(obj interface{}) {
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ts.syncTriggers()
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trigger := obj.(*fv1.HTTPTrigger)
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go deleteIngress(ts.logger, trigger, ts.kubeClient)
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},
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UpdateFunc: func(oldObj interface{}, newObj interface{}) {
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oldTrigger := oldObj.(*fv1.HTTPTrigger)
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newTrigger := newObj.(*fv1.HTTPTrigger)
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if oldTrigger.Metadata.ResourceVersion == newTrigger.Metadata.ResourceVersion {
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return
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}
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go updateIngress(ts.logger, oldTrigger, newTrigger, ts.kubeClient)
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ts.syncTriggers()
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},
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})
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return store, controller
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}
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func (ts *HTTPTriggerSet) initFunctionController() (k8sCache.Store, k8sCache.Controller) {
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resyncPeriod := 30 * time.Second
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listWatch := k8sCache.NewListWatchFromClient(ts.crdClient, "functions", metav1.NamespaceAll, fields.Everything())
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store, controller := k8sCache.NewInformer(listWatch, &fv1.Function{}, resyncPeriod,
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k8sCache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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ts.syncTriggers()
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},
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DeleteFunc: func(obj interface{}) {
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ts.syncTriggers()
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},
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UpdateFunc: func(oldObj interface{}, newObj interface{}) {
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oldFn := oldObj.(*fv1.Function)
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fn := newObj.(*fv1.Function)
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if oldFn.Metadata.ResourceVersion == fn.Metadata.ResourceVersion {
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return
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}
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// update resolver function reference cache
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for key, rr := range ts.resolver.copy() {
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if key.namespace == fn.Metadata.Namespace &&
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rr.functionMetadataMap[fn.Metadata.Name] != nil &&
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rr.functionMetadataMap[fn.Metadata.Name].ResourceVersion != fn.Metadata.ResourceVersion {
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// invalidate resolver cache
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ts.logger.Debug("invalidating resolver cache")
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err := ts.resolver.delete(key.namespace, key.triggerName, key.triggerResourceVersion)
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if err != nil {
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ts.logger.Error("error deleting functionReferenceResolver cache", zap.Error(err))
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}
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break
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}
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}
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ts.syncTriggers()
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},
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})
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return store, controller
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}
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func (ts *HTTPTriggerSet) runWatcher(ctx context.Context, controller k8sCache.Controller) {
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go func() {
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controller.Run(ctx.Done())
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}()
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}
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func (ts *HTTPTriggerSet) syncTriggers() {
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ts.updateRouterRequestChannel <- struct{}{}
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}
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func (ts *HTTPTriggerSet) updateRouter() {
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for range ts.updateRouterRequestChannel {
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// get triggers
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latestTriggers := ts.triggerStore.List()
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triggers := make([]fv1.HTTPTrigger, len(latestTriggers))
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for _, t := range latestTriggers {
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triggers = append(triggers, *t.(*fv1.HTTPTrigger))
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}
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ts.triggers = triggers
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// get functions
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latestFunctions := ts.funcStore.List()
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functionTimeout := make(map[types.UID]int, len(latestFunctions))
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functions := make([]fv1.Function, len(latestFunctions))
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for _, f := range latestFunctions {
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fn := *f.(*fv1.Function)
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functionTimeout[fn.Metadata.UID] = fn.Spec.FunctionTimeout
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functions = append(functions, *f.(*fv1.Function))
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}
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ts.functions = functions
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// make a new router and use it
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ts.mutableRouter.updateRouter(ts.getRouter(functionTimeout))
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}
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}
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