mirror of https://github.com/hashicorp/consul
93 lines
2.5 KiB
Go
93 lines
2.5 KiB
Go
// Copyright 2018 Envoyproxy Authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package cache
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import (
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"sync"
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"time"
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"github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
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)
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// NodeHash computes string identifiers for Envoy nodes.
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type NodeHash interface {
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// ID function defines a unique string identifier for the remote Envoy node.
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ID(node *core.Node) string
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}
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// StatusInfo tracks the server state for the remote Envoy node.
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// Not all fields are used by all cache implementations.
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type StatusInfo interface {
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// GetNode returns the node metadata.
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GetNode() *core.Node
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// GetNumWatches returns the number of open watches.
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GetNumWatches() int
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// GetLastWatchRequestTime returns the timestamp of the last discovery watch request.
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GetLastWatchRequestTime() time.Time
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}
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type statusInfo struct {
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// node is the constant Envoy node metadata.
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node *core.Node
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// watches are indexed channels for the response watches and the original requests.
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watches map[int64]ResponseWatch
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// the timestamp of the last watch request
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lastWatchRequestTime time.Time
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// mutex to protect the status fields.
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// should not acquire mutex of the parent cache after acquiring this mutex.
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mu sync.RWMutex
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}
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// ResponseWatch is a watch record keeping both the request and an open channel for the response.
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type ResponseWatch struct {
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// Request is the original request for the watch.
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Request Request
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// Response is the channel to push response to.
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Response chan Response
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}
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// newStatusInfo initializes a status info data structure.
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func newStatusInfo(node *core.Node) *statusInfo {
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out := statusInfo{
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node: node,
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watches: make(map[int64]ResponseWatch),
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}
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return &out
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}
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func (info *statusInfo) GetNode() *core.Node {
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info.mu.RLock()
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defer info.mu.RUnlock()
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return info.node
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}
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func (info *statusInfo) GetNumWatches() int {
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info.mu.RLock()
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defer info.mu.RUnlock()
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return len(info.watches)
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}
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func (info *statusInfo) GetLastWatchRequestTime() time.Time {
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info.mu.RLock()
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defer info.mu.RUnlock()
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return info.lastWatchRequestTime
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}
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