Soam Vasani
fa272f20a0
Addresses issue #51. Makes versioning in poolmgr explicit, so its cache needs no invalidation on version update. Functions in poolmgr are always cached by name and UID. Router now updates implictly versioned routes with the latest version of a function. This means that users will see requests to implicitly-versioned routes go to the latest version of a function within 3 seconds. (Those 3 sec will go away when we use a real watch instead of polling the controller.) There's no change in behaviour for routes that explictly specify a function UID.
129 lines
3.3 KiB
Go
129 lines
3.3 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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"log"
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"time"
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"github.com/gorilla/mux"
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"github.com/fission/fission"
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controllerClient "github.com/fission/fission/controller/client"
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poolmgrClient "github.com/fission/fission/poolmgr/client"
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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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controller *controllerClient.Client
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poolmgr *poolmgrClient.Client
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triggers []fission.HTTPTrigger
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functions []fission.Function
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}
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func makeHTTPTriggerSet(fmap *functionServiceMap, controller *controllerClient.Client, poolmgr *poolmgrClient.Client) *HTTPTriggerSet {
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triggers := make([]fission.HTTPTrigger, 1)
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return &HTTPTriggerSet{
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functionServiceMap: fmap,
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triggers: triggers,
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controller: controller,
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poolmgr: poolmgr,
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}
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}
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func (ts *HTTPTriggerSet) subscribeRouter(mr *mutableRouter) {
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ts.mutableRouter = mr
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mr.updateRouter(ts.getRouter())
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go ts.watchTriggers()
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}
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func (ts *HTTPTriggerSet) getRouter() *mux.Router {
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muxRouter := mux.NewRouter()
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// make a name -> latest version map
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latestVersions := make(map[string]string)
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for _, f := range ts.functions {
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latestVersions[f.Metadata.Name] = f.Metadata.Uid
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}
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// HTTP triggers setup by the user
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for _, trigger := range ts.triggers {
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m := trigger.Function
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if len(m.Uid) == 0 {
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// explicitly use the latest function version
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m.Uid = latestVersions[m.Name]
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}
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fh := &functionHandler{
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fmap: ts.functionServiceMap,
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Function: m,
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poolmgr: ts.poolmgr,
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}
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muxRouter.HandleFunc(trigger.UrlPattern, fh.handler)
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}
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// Internal triggers for (the latest version of) each function
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for _, function := range ts.functions {
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m := fission.Metadata{Name: function.Metadata.Name}
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fh := &functionHandler{
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fmap: ts.functionServiceMap,
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Function: m,
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poolmgr: ts.poolmgr,
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}
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muxRouter.HandleFunc(fission.UrlForFunction(&m), fh.handler)
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}
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return muxRouter
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}
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func (ts *HTTPTriggerSet) watchTriggers() {
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if ts.controller == nil {
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return
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}
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// the number of connection failures we'll accept before quitting
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maxFailures := 5
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// amount of time to sleep between polling calls
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pollSleepDuration := 3 * time.Second
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// Watch controller for updates to triggers and update the router accordingly.
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// TODO change this to use a watch API; or maybe even watch etcd directly.
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failureCount := 0
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for {
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triggers, err := ts.controller.HTTPTriggerList()
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if err != nil {
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failureCount += 1
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if failureCount >= maxFailures {
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log.Fatalf("Failed to connect to controller after %v retries: %v", failureCount, err)
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}
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time.Sleep(pollSleepDuration)
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continue
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}
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ts.triggers = triggers
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functions, err := ts.controller.FunctionList()
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if err != nil {
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log.Fatalf("Failed to get function list")
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}
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ts.functions = functions
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ts.mutableRouter.updateRouter(ts.getRouter())
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time.Sleep(pollSleepDuration)
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}
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}
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