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

pkg/router/functionRecorderMap.go

@@ -0,0 +1,66 @@
+/*
+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 router
+
+import (
+	"time"
+
+	"go.uber.org/zap"
+
+	fv1 "github.com/fission/fission/pkg/apis/fission.io/v1"
+	"github.com/fission/fission/pkg/cache"
+	ferror "github.com/fission/fission/pkg/error"
+)
+
+type (
+	functionRecorderMap struct {
+		logger *zap.Logger
+		cache  *cache.Cache // map[string]*fv1.Recorder
+	}
+)
+
+// Why do we need an expiry?
+func makeFunctionRecorderMap(logger *zap.Logger, expiry time.Duration) *functionRecorderMap {
+	return &functionRecorderMap{
+		logger: logger.Named("function_recorder_map"),
+		cache:  cache.MakeCache(expiry, 0),
+	}
+}
+
+func (frmap *functionRecorderMap) lookup(function string) (*fv1.Recorder, error) {
+	item, err := frmap.cache.Get(function)
+	if err != nil {
+		return nil, err
+	}
+	u := item.(*fv1.Recorder)
+	return u, nil
+}
+
+func (frmap *functionRecorderMap) assign(function string, recorder *fv1.Recorder) {
+	err, _ := frmap.cache.Set(function, recorder)
+	if err != nil {
+		if e, ok := err.(ferror.Error); ok && e.Code == ferror.ErrorNameExists {
+			return
+		}
+		frmap.logger.Error("error caching recorder for function name with a different value", zap.Error(err))
+	}
+
+}
+
+func (frmap *functionRecorderMap) remove(function string) error {
+	return frmap.cache.Delete(function)
+}