538 lines
21 KiB
Go
538 lines
21 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 canaryconfigmgr
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import (
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"context"
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"fmt"
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"net/url"
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"os"
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"strings"
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"time"
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"github.com/pkg/errors"
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"go.uber.org/zap"
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k8serrors "k8s.io/apimachinery/pkg/api/errors"
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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/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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"github.com/fission/fission/pkg/types"
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)
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const (
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maxRetries = 10
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)
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type canaryConfigMgr struct {
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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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canaryConfigStore k8sCache.Store
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canaryConfigController k8sCache.Controller
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promClient *PrometheusApiClient
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crdClient *rest.RESTClient
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canaryCfgCancelFuncMap *canaryConfigCancelFuncMap
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}
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func MakeCanaryConfigMgr(logger *zap.Logger, fissionClient *crd.FissionClient, kubeClient *kubernetes.Clientset, crdClient *rest.RESTClient, prometheusSvc string) (*canaryConfigMgr, error) {
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if prometheusSvc == "" {
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logger.Info("try to retrieve prometheus server information from environment variables")
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var prometheusSvcHost, prometheusSvcPort string
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// handle a case where there is a prometheus server is already installed, try to find the service from env variable
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envVars := os.Environ()
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for _, envVar := range envVars {
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if strings.Contains(envVar, "PROMETHEUS_SERVER_SERVICE_HOST") {
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prometheusSvcHost = getEnvValue(envVar)
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} else if strings.Contains(envVar, "PROMETHEUS_SERVER_SERVICE_PORT") {
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prometheusSvcPort = getEnvValue(envVar)
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}
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if len(prometheusSvcHost) > 0 && len(prometheusSvcPort) > 0 {
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break
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}
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}
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prometheusSvc = fmt.Sprintf("http://%v:%v", prometheusSvcHost, prometheusSvcPort)
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}
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_, err := url.Parse(prometheusSvc)
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if err != nil {
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return nil, fmt.Errorf("prometheus service url not found/invalid, cant create canary config manager: %v", prometheusSvc)
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}
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promClient, err := MakePrometheusClient(logger, prometheusSvc)
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if err != nil {
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return nil, err
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}
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configMgr := &canaryConfigMgr{
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logger: logger.Named("canary_config_manager"),
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fissionClient: fissionClient,
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kubeClient: kubeClient,
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crdClient: crdClient,
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promClient: promClient,
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canaryCfgCancelFuncMap: makecanaryConfigCancelFuncMap(),
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}
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store, controller := configMgr.initCanaryConfigController()
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configMgr.canaryConfigStore = store
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configMgr.canaryConfigController = controller
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return configMgr, nil
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}
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func (canaryCfgMgr *canaryConfigMgr) initCanaryConfigController() (k8sCache.Store, k8sCache.Controller) {
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resyncPeriod := 30 * time.Second
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listWatch := k8sCache.NewListWatchFromClient(canaryCfgMgr.crdClient, "canaryconfigs", metav1.NamespaceAll, fields.Everything())
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store, controller := k8sCache.NewInformer(listWatch, &fv1.CanaryConfig{}, resyncPeriod,
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k8sCache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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canaryConfig := obj.(*fv1.CanaryConfig)
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if canaryConfig.Status.Status == types.CanaryConfigStatusPending {
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go canaryCfgMgr.addCanaryConfig(canaryConfig)
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}
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},
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DeleteFunc: func(obj interface{}) {
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canaryConfig := obj.(*fv1.CanaryConfig)
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go canaryCfgMgr.deleteCanaryConfig(canaryConfig)
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},
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UpdateFunc: func(oldObj interface{}, newObj interface{}) {
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oldConfig := oldObj.(*fv1.CanaryConfig)
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newConfig := newObj.(*fv1.CanaryConfig)
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if oldConfig.Metadata.ResourceVersion != newConfig.Metadata.ResourceVersion &&
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newConfig.Status.Status == types.CanaryConfigStatusPending {
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canaryCfgMgr.logger.Info("update canary config invoked",
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zap.String("name", newConfig.Metadata.Name),
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zap.String("namespace", newConfig.Metadata.Namespace),
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zap.String("version", newConfig.Metadata.ResourceVersion))
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go canaryCfgMgr.updateCanaryConfig(oldConfig, newConfig)
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}
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go canaryCfgMgr.reSyncCanaryConfigs()
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},
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})
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return store, controller
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}
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func (canaryCfgMgr *canaryConfigMgr) Run(ctx context.Context) {
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go canaryCfgMgr.canaryConfigController.Run(ctx.Done())
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canaryCfgMgr.logger.Info("started canary configmgr controller")
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}
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func (canaryCfgMgr *canaryConfigMgr) addCanaryConfig(canaryConfig *fv1.CanaryConfig) {
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canaryCfgMgr.logger.Debug("addCanaryConfig called", zap.String("canary_config", canaryConfig.Metadata.Name))
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// for each canary config, create a ticker with increment interval
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interval, err := time.ParseDuration(canaryConfig.Spec.WeightIncrementDuration)
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if err != nil {
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canaryCfgMgr.logger.Error("error parsing duration - cant proceed with this canaryConfig",
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zap.Error(err),
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zap.String("duration", canaryConfig.Spec.WeightIncrementDuration),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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return
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}
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ticker := time.NewTicker(interval)
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// create a context cancel func for each canary config. this will be used to cancel the processing of this canary
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// config in the event that it's deleted
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ctx, cancel := context.WithCancel(context.Background())
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cacheValue := &CanaryProcessingInfo{
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CancelFunc: &cancel,
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Ticker: ticker,
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}
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err = canaryCfgMgr.canaryCfgCancelFuncMap.assign(&canaryConfig.Metadata, cacheValue)
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if err != nil {
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canaryCfgMgr.logger.Error("error caching canary config",
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zap.Error(err),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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return
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}
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canaryCfgMgr.processCanaryConfig(&ctx, canaryConfig, ticker)
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}
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func (canaryCfgMgr *canaryConfigMgr) processCanaryConfig(ctx *context.Context, canaryConfig *fv1.CanaryConfig, ticker *time.Ticker) {
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quit := make(chan struct{})
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for {
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select {
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case <-(*ctx).Done():
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// this case when someone deleted their canary config in the middle of it being processed
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canaryCfgMgr.logger.Info("cancel func called for canary config",
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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err := canaryCfgMgr.canaryCfgCancelFuncMap.remove(&canaryConfig.Metadata)
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if err != nil {
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canaryCfgMgr.logger.Error("error removing canary config",
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zap.Error(err),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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}
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return
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case <-ticker.C:
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// every weightIncrementDuration, check if failureThreshold has reached.
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// if yes, rollback.
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// else, increment the weight of new function and decrement old function by `weightIncrement`
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canaryCfgMgr.logger.Info("processing canary config",
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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canaryCfgMgr.RollForwardOrBack(canaryConfig, quit, ticker)
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case <-quit:
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// we're done processing this canary config either because the new function receives 100% of the traffic
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// or we rolled back to send all 100% traffic to old function
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canaryCfgMgr.logger.Info("quit processing canaryConfig",
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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err := canaryCfgMgr.canaryCfgCancelFuncMap.remove(&canaryConfig.Metadata)
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if err != nil {
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canaryCfgMgr.logger.Error("error removing canary config from map",
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zap.Error(err),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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}
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return
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}
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}
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}
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func (canaryCfgMgr *canaryConfigMgr) RollForwardOrBack(canaryConfig *fv1.CanaryConfig, quit chan struct{}, ticker *time.Ticker) {
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// handle race between delete event and notification on ticker.C
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_, err := canaryCfgMgr.canaryCfgCancelFuncMap.lookup(&canaryConfig.Metadata)
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if err != nil {
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canaryCfgMgr.logger.Info("no need of processing the config, not in cache anymore",
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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return
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}
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// get the http trigger object associated with this canary config
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triggerObj, err := canaryCfgMgr.fissionClient.HTTPTriggers(canaryConfig.Metadata.Namespace).Get(canaryConfig.Spec.Trigger)
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if err != nil {
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// if the http trigger is not found, then give up processing this config.
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if k8serrors.IsNotFound(err) {
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canaryCfgMgr.logger.Error("http trigger object for canary config missing",
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zap.Error(err),
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zap.String("trigger", canaryConfig.Spec.Trigger),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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close(quit)
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return
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}
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// just silently ignore. wait for next window to increment weight
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canaryCfgMgr.logger.Error("error fetching http trigger object for config",
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zap.Error(err),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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return
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}
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// handle a race between ticker.Stop and receiving a notification on ticker.C
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if canaryConfig.Status.Status != types.CanaryConfigStatusPending {
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canaryCfgMgr.logger.Info("no need of processing the config, not pending anymore",
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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return
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}
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if triggerObj.Spec.FunctionReference.Type == types.FunctionReferenceTypeFunctionWeights &&
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triggerObj.Spec.FunctionReference.FunctionWeights[canaryConfig.Spec.NewFunction] != 0 {
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failurePercent, err := canaryCfgMgr.promClient.GetFunctionFailurePercentage(triggerObj.Spec.RelativeURL, triggerObj.Spec.Method,
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canaryConfig.Spec.NewFunction, canaryConfig.Metadata.Namespace, canaryConfig.Spec.WeightIncrementDuration)
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if err != nil {
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// silently ignore. wait for next window to increment weight
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canaryCfgMgr.logger.Error("error calculating failure percentage",
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zap.Error(err),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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return
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}
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canaryCfgMgr.logger.Info("failure percentage calculated for canaryConfig",
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zap.Float64("failure_percent", failurePercent),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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if failurePercent == -1 {
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// this means there were no requests triggered to this url during this window. return here and check back
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// during next iteration
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canaryCfgMgr.logger.Info("total requests received for url is 0", zap.String("url", triggerObj.Spec.RelativeURL))
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return
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}
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if int(failurePercent) > canaryConfig.Spec.FailureThreshold {
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canaryCfgMgr.logger.Error("failure percent crossed the threshold, so rolling back",
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zap.Float64("failure_percent", failurePercent),
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zap.Int("threshold", canaryConfig.Spec.FailureThreshold),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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ticker.Stop()
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err := canaryCfgMgr.rollback(canaryConfig, triggerObj)
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if err != nil {
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canaryCfgMgr.logger.Error("error rolling back canary config",
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zap.Error(err),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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}
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close(quit)
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return
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}
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}
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doneProcessingCanaryConfig, err := canaryCfgMgr.rollForward(canaryConfig, triggerObj)
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if err != nil {
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// just log the error and hope that next iteration will succeed
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canaryCfgMgr.logger.Error("error incrementing weights for trigger",
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zap.Error(err),
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zap.String("trigger", triggerObj.Metadata.Name),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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return
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}
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if doneProcessingCanaryConfig {
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ticker.Stop()
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// update the status of canary config as done processing, we dont care if we arent able to update because
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// resync takes care of the update
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err = canaryCfgMgr.updateCanaryConfigStatusWithRetries(canaryConfig.Metadata.Name, canaryConfig.Metadata.Namespace,
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types.CanaryConfigStatusSucceeded)
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if err != nil {
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// cant do much after max retries other than logging it.
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canaryCfgMgr.logger.Error("error updating canary config after max retries",
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zap.Error(err),
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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}
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canaryCfgMgr.logger.Info("done processing canary config - the new function is receiving all the traffic",
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zap.String("name", canaryConfig.Metadata.Name),
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zap.String("namespace", canaryConfig.Metadata.Namespace),
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zap.String("version", canaryConfig.Metadata.ResourceVersion))
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close(quit)
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return
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}
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}
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func (canaryCfgMgr *canaryConfigMgr) updateHttpTriggerWithRetries(triggerName, triggerNamespace string, fnWeights map[string]int) (err error) {
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for i := 0; i < maxRetries; i++ {
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triggerObj, err := canaryCfgMgr.fissionClient.HTTPTriggers(triggerNamespace).Get(triggerName)
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if err != nil {
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e := "error getting http trigger object"
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canaryCfgMgr.logger.Error(e, zap.Error(err), zap.String("trigger_name", triggerName), zap.String("trigger_namespace", triggerNamespace))
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return errors.Wrap(err, e)
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}
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triggerObj.Spec.FunctionReference.FunctionWeights = fnWeights
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_, err = canaryCfgMgr.fissionClient.HTTPTriggers(triggerNamespace).Update(triggerObj)
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switch {
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case err == nil:
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canaryCfgMgr.logger.Debug("updated http trigger", zap.String("trigger_name", triggerName), zap.String("trigger_namespace", triggerNamespace))
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return nil
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case k8serrors.IsConflict(err):
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canaryCfgMgr.logger.Error("conflict in updating http trigger, retrying",
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zap.Error(err),
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zap.String("trigger_name", triggerName),
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zap.String("trigger_namespace", triggerNamespace))
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continue
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default:
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e := "error updating http trigger"
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canaryCfgMgr.logger.Error(e,
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zap.Error(err),
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zap.String("trigger_name", triggerName),
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zap.String("trigger_namespace", triggerNamespace))
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return errors.Wrapf(err, "%s: %s.%s", e, triggerName, triggerNamespace)
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}
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}
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return err
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}
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func (canaryCfgMgr *canaryConfigMgr) updateCanaryConfigStatusWithRetries(cfgName, cfgNamespace string, status string) (err error) {
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for i := 0; i < maxRetries; i++ {
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canaryCfgObj, err := canaryCfgMgr.fissionClient.CanaryConfigs(cfgNamespace).Get(cfgName)
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if err != nil {
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e := "error getting http canary config object"
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canaryCfgMgr.logger.Error(e,
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zap.Error(err),
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zap.String("name", cfgName),
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zap.String("namespace", cfgNamespace),
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zap.String("status", status))
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return errors.Wrap(err, e)
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}
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canaryCfgMgr.logger.Info("updating status of canary config",
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zap.String("name", cfgName),
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zap.String("namespace", cfgNamespace),
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zap.String("status", status))
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canaryCfgObj.Status.Status = status
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_, err = canaryCfgMgr.fissionClient.CanaryConfigs(cfgNamespace).Update(canaryCfgObj)
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switch {
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case err == nil:
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canaryCfgMgr.logger.Info("updated canary config",
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zap.String("name", cfgName),
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zap.String("namespace", cfgNamespace))
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return nil
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case k8serrors.IsConflict(err):
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canaryCfgMgr.logger.Info("conflict in updating canary config",
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zap.Error(err),
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zap.String("name", cfgName),
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zap.String("namespace", cfgNamespace))
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continue
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default:
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e := "error updating canary config"
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canaryCfgMgr.logger.Error(e,
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zap.Error(err),
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zap.String("name", cfgName),
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zap.String("namespace", cfgNamespace))
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return errors.Wrapf(err, "%s: %s.%s", e, cfgName, cfgNamespace)
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}
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}
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return err
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}
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func (canaryCfgMgr *canaryConfigMgr) rollback(canaryConfig *fv1.CanaryConfig, trigger *fv1.HTTPTrigger) error {
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functionWeights := trigger.Spec.FunctionReference.FunctionWeights
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functionWeights[canaryConfig.Spec.NewFunction] = 0
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functionWeights[canaryConfig.Spec.OldFunction] = 100
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err := canaryCfgMgr.updateHttpTriggerWithRetries(trigger.Metadata.Name, trigger.Metadata.Namespace, functionWeights)
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if err != nil {
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return err
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}
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|
|
|
err = canaryCfgMgr.updateCanaryConfigStatusWithRetries(canaryConfig.Metadata.Name, canaryConfig.Metadata.Namespace,
|
|
types.CanaryConfigStatusFailed)
|
|
|
|
return err
|
|
}
|
|
|
|
func (canaryCfgMgr *canaryConfigMgr) rollForward(canaryConfig *fv1.CanaryConfig, trigger *fv1.HTTPTrigger) (bool, error) {
|
|
doneProcessingCanaryConfig := false
|
|
|
|
functionWeights := trigger.Spec.FunctionReference.FunctionWeights
|
|
if functionWeights[canaryConfig.Spec.NewFunction]+canaryConfig.Spec.WeightIncrement >= 100 {
|
|
doneProcessingCanaryConfig = true
|
|
functionWeights[canaryConfig.Spec.NewFunction] = 100
|
|
functionWeights[canaryConfig.Spec.OldFunction] = 0
|
|
} else {
|
|
functionWeights[canaryConfig.Spec.NewFunction] += canaryConfig.Spec.WeightIncrement
|
|
if functionWeights[canaryConfig.Spec.OldFunction]-canaryConfig.Spec.WeightIncrement < 0 {
|
|
functionWeights[canaryConfig.Spec.OldFunction] = 0
|
|
} else {
|
|
functionWeights[canaryConfig.Spec.OldFunction] -= canaryConfig.Spec.WeightIncrement
|
|
}
|
|
}
|
|
|
|
canaryCfgMgr.logger.Info("incremented functionWeights",
|
|
zap.String("name", canaryConfig.Metadata.Name),
|
|
zap.String("namespace", canaryConfig.Metadata.Namespace),
|
|
zap.Any("function_weights", functionWeights))
|
|
|
|
err := canaryCfgMgr.updateHttpTriggerWithRetries(trigger.Metadata.Name, trigger.Metadata.Namespace, functionWeights)
|
|
return doneProcessingCanaryConfig, err
|
|
}
|
|
|
|
func (canaryCfgMgr *canaryConfigMgr) reSyncCanaryConfigs() {
|
|
for _, obj := range canaryCfgMgr.canaryConfigStore.List() {
|
|
canaryConfig := obj.(*fv1.CanaryConfig)
|
|
_, err := canaryCfgMgr.canaryCfgCancelFuncMap.lookup(&canaryConfig.Metadata)
|
|
if err != nil && canaryConfig.Status.Status == types.CanaryConfigStatusPending {
|
|
canaryCfgMgr.logger.Debug("adding canary config from resync loop",
|
|
zap.String("name", canaryConfig.Metadata.Name),
|
|
zap.String("namespace", canaryConfig.Metadata.Namespace),
|
|
zap.String("version", canaryConfig.Metadata.ResourceVersion))
|
|
|
|
// new canaryConfig detected, add it to our cache and start processing it
|
|
go canaryCfgMgr.addCanaryConfig(canaryConfig)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (canaryCfgMgr *canaryConfigMgr) deleteCanaryConfig(canaryConfig *fv1.CanaryConfig) {
|
|
canaryCfgMgr.logger.Debug("delete event received for canary config",
|
|
zap.String("name", canaryConfig.Metadata.Name),
|
|
zap.String("namespace", canaryConfig.Metadata.Namespace),
|
|
zap.String("version", canaryConfig.Metadata.ResourceVersion))
|
|
canaryProcessingInfo, err := canaryCfgMgr.canaryCfgCancelFuncMap.lookup(&canaryConfig.Metadata)
|
|
if err != nil {
|
|
canaryCfgMgr.logger.Error("lookup of canary config for deletion failed",
|
|
zap.Error(err),
|
|
zap.String("name", canaryConfig.Metadata.Name),
|
|
zap.String("namespace", canaryConfig.Metadata.Namespace),
|
|
zap.String("version", canaryConfig.Metadata.ResourceVersion))
|
|
return
|
|
}
|
|
// first stop the ticker
|
|
canaryProcessingInfo.Ticker.Stop()
|
|
// call cancel func so that the ctx.Done returns inside processCanaryConfig function and processing gets stopped
|
|
(*canaryProcessingInfo.CancelFunc)()
|
|
}
|
|
|
|
func (canaryCfgMgr *canaryConfigMgr) updateCanaryConfig(oldCanaryConfig *fv1.CanaryConfig, newCanaryConfig *fv1.CanaryConfig) {
|
|
// before removing the object from cache, we need to get it's cancel func and cancel it
|
|
canaryCfgMgr.deleteCanaryConfig(oldCanaryConfig)
|
|
|
|
err := canaryCfgMgr.canaryCfgCancelFuncMap.remove(&oldCanaryConfig.Metadata)
|
|
if err != nil {
|
|
canaryCfgMgr.logger.Error("error removing canary config from map",
|
|
zap.Error(err),
|
|
zap.String("name", oldCanaryConfig.Metadata.Name),
|
|
zap.String("namespace", oldCanaryConfig.Metadata.Namespace),
|
|
zap.String("version", oldCanaryConfig.Metadata.ResourceVersion))
|
|
return
|
|
}
|
|
canaryCfgMgr.addCanaryConfig(newCanaryConfig)
|
|
}
|
|
|
|
func getEnvValue(envVar string) string {
|
|
envVarSplit := strings.Split(envVar, "=")
|
|
return envVarSplit[1]
|
|
}
|