93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
// Copyright 2018 Envoyproxy 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 cache
|
|
|
|
import (
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
|
|
)
|
|
|
|
// NodeHash computes string identifiers for Envoy nodes.
|
|
type NodeHash interface {
|
|
// ID function defines a unique string identifier for the remote Envoy node.
|
|
ID(node *core.Node) string
|
|
}
|
|
|
|
// StatusInfo tracks the server state for the remote Envoy node.
|
|
// Not all fields are used by all cache implementations.
|
|
type StatusInfo interface {
|
|
// GetNode returns the node metadata.
|
|
GetNode() *core.Node
|
|
|
|
// GetNumWatches returns the number of open watches.
|
|
GetNumWatches() int
|
|
|
|
// GetLastWatchRequestTime returns the timestamp of the last discovery watch request.
|
|
GetLastWatchRequestTime() time.Time
|
|
}
|
|
|
|
type statusInfo struct {
|
|
// node is the constant Envoy node metadata.
|
|
node *core.Node
|
|
|
|
// watches are indexed channels for the response watches and the original requests.
|
|
watches map[int64]ResponseWatch
|
|
|
|
// the timestamp of the last watch request
|
|
lastWatchRequestTime time.Time
|
|
|
|
// mutex to protect the status fields.
|
|
// should not acquire mutex of the parent cache after acquiring this mutex.
|
|
mu sync.RWMutex
|
|
}
|
|
|
|
// ResponseWatch is a watch record keeping both the request and an open channel for the response.
|
|
type ResponseWatch struct {
|
|
// Request is the original request for the watch.
|
|
Request Request
|
|
|
|
// Response is the channel to push response to.
|
|
Response chan Response
|
|
}
|
|
|
|
// newStatusInfo initializes a status info data structure.
|
|
func newStatusInfo(node *core.Node) *statusInfo {
|
|
out := statusInfo{
|
|
node: node,
|
|
watches: make(map[int64]ResponseWatch),
|
|
}
|
|
return &out
|
|
}
|
|
|
|
func (info *statusInfo) GetNode() *core.Node {
|
|
info.mu.RLock()
|
|
defer info.mu.RUnlock()
|
|
return info.node
|
|
}
|
|
|
|
func (info *statusInfo) GetNumWatches() int {
|
|
info.mu.RLock()
|
|
defer info.mu.RUnlock()
|
|
return len(info.watches)
|
|
}
|
|
|
|
func (info *statusInfo) GetLastWatchRequestTime() time.Time {
|
|
info.mu.RLock()
|
|
defer info.mu.RUnlock()
|
|
return info.lastWatchRequestTime
|
|
}
|