7c9314f231
* swarm: propagate ctx, enable opentracing * swarm/tracing: log error when tracing is misconfigured
64 lines
1.8 KiB
Go
64 lines
1.8 KiB
Go
// Copyright (c) 2017 Uber Technologies, Inc.
|
|
//
|
|
// 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 rpcmetrics
|
|
|
|
import "sync"
|
|
|
|
// normalizedEndpoints is a cache for endpointName -> safeName mappings.
|
|
type normalizedEndpoints struct {
|
|
names map[string]string
|
|
maxSize int
|
|
defaultName string
|
|
normalizer NameNormalizer
|
|
mux sync.RWMutex
|
|
}
|
|
|
|
func newNormalizedEndpoints(maxSize int, normalizer NameNormalizer) *normalizedEndpoints {
|
|
return &normalizedEndpoints{
|
|
maxSize: maxSize,
|
|
normalizer: normalizer,
|
|
names: make(map[string]string, maxSize),
|
|
}
|
|
}
|
|
|
|
// normalize looks up the name in the cache, if not found it uses normalizer
|
|
// to convert the name to a safe name. If called with more than maxSize unique
|
|
// names it returns "" for all other names beyond those already cached.
|
|
func (n *normalizedEndpoints) normalize(name string) string {
|
|
n.mux.RLock()
|
|
norm, ok := n.names[name]
|
|
l := len(n.names)
|
|
n.mux.RUnlock()
|
|
if ok {
|
|
return norm
|
|
}
|
|
if l >= n.maxSize {
|
|
return ""
|
|
}
|
|
return n.normalizeWithLock(name)
|
|
}
|
|
|
|
func (n *normalizedEndpoints) normalizeWithLock(name string) string {
|
|
norm := n.normalizer.Normalize(name)
|
|
n.mux.Lock()
|
|
defer n.mux.Unlock()
|
|
// cache may have grown while we were not holding the lock
|
|
if len(n.names) >= n.maxSize {
|
|
return ""
|
|
}
|
|
n.names[name] = norm
|
|
return norm
|
|
}
|