mirror of https://github.com/hashicorp/consul
71 lines
2.5 KiB
Go
71 lines
2.5 KiB
Go
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// 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 defines a configuration cache for the server.
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package cache
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import (
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"context"
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"github.com/envoyproxy/go-control-plane/envoy/api/v2"
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)
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// Request is an alias for the discovery request type.
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type Request = v2.DiscoveryRequest
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// ConfigWatcher requests watches for configuration resources by a node, last
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// applied version identifier, and resource names hint. The watch should send
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// the responses when they are ready. The watch can be cancelled by the
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// consumer, in effect terminating the watch for the request.
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// ConfigWatcher implementation must be thread-safe.
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type ConfigWatcher interface {
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// CreateWatch returns a new open watch from a non-empty request.
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//
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// Value channel produces requested resources, once they are available. If
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// the channel is closed prior to cancellation of the watch, an unrecoverable
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// error has occurred in the producer, and the consumer should close the
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// corresponding stream.
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//
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// Cancel is an optional function to release resources in the producer. If
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// provided, the consumer may call this function multiple times.
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CreateWatch(Request) (value chan Response, cancel func())
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}
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// Cache is a generic config cache with a watcher.
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type Cache interface {
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ConfigWatcher
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// Fetch implements the polling method of the config cache using a non-empty request.
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Fetch(context.Context, Request) (*Response, error)
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// GetStatusInfo retrieves status information for a node ID.
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GetStatusInfo(string) StatusInfo
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// GetStatusKeys retrieves node IDs for all statuses.
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GetStatusKeys() []string
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}
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// Response is a pre-serialized xDS response.
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type Response struct {
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// Request is the original request.
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Request v2.DiscoveryRequest
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// Version of the resources as tracked by the cache for the given type.
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// Proxy responds with this version as an acknowledgement.
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Version string
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// Resources to be included in the response.
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Resources []Resource
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}
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