Move packages to proejct/pkg to follow go project folder structure convention (#1190)

pkg/controller/config.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2018 The Fission 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 controller
+
+import (
+	"context"
+
+	"github.com/pkg/errors"
+	"go.uber.org/zap"
+	"k8s.io/client-go/kubernetes"
+
+	"github.com/fission/fission/pkg/canaryconfigmgr"
+	"github.com/fission/fission/pkg/crd"
+	config "github.com/fission/fission/pkg/featureconfig"
+)
+
+func ConfigCanaryFeature(context context.Context, logger *zap.Logger, fissionClient *crd.FissionClient, kubeClient *kubernetes.Clientset, featureConfig *config.FeatureConfig, featureStatus map[string]string) error {
+	// start the appropriate controller
+	if featureConfig.CanaryConfig.IsEnabled {
+		canaryCfgMgr, err := canaryconfigmgr.MakeCanaryConfigMgr(logger, fissionClient, kubeClient, fissionClient.GetCrdClient(),
+			featureConfig.CanaryConfig.PrometheusSvc)
+		if err != nil {
+			featureStatus[config.CanaryFeature] = err.Error()
+			return errors.Wrap(err, "failed to start canary config manager")
+		}
+		canaryCfgMgr.Run(context)
+		logger.Info("started canary config manager")
+	}
+
+	return nil
+}
+
+// ConfigureFeatures gets the feature config and configures the features that are enabled
+func ConfigureFeatures(context context.Context, logger *zap.Logger, unitTestMode bool, fissionClient *crd.FissionClient, kubeClient *kubernetes.Clientset) (map[string]string, error) {
+	// set feature enabled to false if unitTestMode
+	if unitTestMode {
+		return nil, nil
+	}
+
+	// get the featureConfig from config map mounted onto the file system
+	featureConfig, err := config.GetFeatureConfig()
+	if err != nil {
+		logger.Error("error getting feature config", zap.Error(err))
+		return nil, err
+	}
+
+	featureStatus := make(map[string]string)
+
+	// configure respective features
+	// in the future when new optional features are added, we need to add corresponding feature handlers and invoke them here
+	err = ConfigCanaryFeature(context, logger, fissionClient, kubeClient, featureConfig, featureStatus)
+	return featureStatus, err
+}