mirror of https://github.com/hashicorp/consul
92 lines
3.7 KiB
Go
92 lines
3.7 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package xdsv2
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import (
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"fmt"
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"github.com/hashicorp/go-hclog"
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"google.golang.org/protobuf/proto"
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"github.com/hashicorp/consul/envoyextensions/xdscommon"
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proxytracker "github.com/hashicorp/consul/internal/mesh/proxy-tracker"
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)
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// ResourceGenerator is associated with a single gRPC stream and creates xDS
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// resources for a single client.
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type ResourceGenerator struct {
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Logger hclog.Logger
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ProxyFeatures xdscommon.SupportedProxyFeatures
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}
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// NewResourceGenerator will create a new ResourceGenerator.
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func NewResourceGenerator(
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logger hclog.Logger,
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) *ResourceGenerator {
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return &ResourceGenerator{
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Logger: logger,
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}
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}
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// ProxyResources is the main state used to convert proxyState resources to Envoy resources.
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type ProxyResources struct {
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// proxyState is the final proxyState computed by Consul controllers.
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proxyState *proxytracker.ProxyState
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// envoyResources is a map of each resource type (listener, endpoint, route, cluster, etc.)
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// with a corresponding map of k/v pairs of resource name to envoy proto message.
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// map[string]map[string]proto.Message is used over map[string][]proto.Message because
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// AllResourcesFromIR() will create envoy resource by walking the object graph from listener
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// to endpoint. In the process, the same resource might be referenced more than once,
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// so the map is used to prevent duplicate resources being created and also will use
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// an O(1) lookup to see if it exists (it actually will set the map key rather than
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// checks everywhere) where as each lookup would be O(n) with a []proto structure.
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envoyResources map[string]map[string]proto.Message
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}
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func (g *ResourceGenerator) AllResourcesFromIR(proxyState *proxytracker.ProxyState) (map[string][]proto.Message, error) {
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pr := &ProxyResources{
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proxyState: proxyState,
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envoyResources: make(map[string]map[string]proto.Message),
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}
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pr.envoyResources[xdscommon.ListenerType] = make(map[string]proto.Message)
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pr.envoyResources[xdscommon.RouteType] = make(map[string]proto.Message)
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pr.envoyResources[xdscommon.ClusterType] = make(map[string]proto.Message)
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pr.envoyResources[xdscommon.EndpointType] = make(map[string]proto.Message)
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err := pr.makeEnvoyResourceGraphsStartingFromListeners()
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if err != nil {
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return nil, fmt.Errorf("failed to generate xDS resources for ProxyState: %v", err)
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}
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// Now account for Clusters that did not have a destination.
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for name := range proxyState.Clusters {
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if _, ok := pr.envoyResources[xdscommon.ClusterType][name]; !ok {
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pr.addEnvoyClustersAndEndpointsToEnvoyResources(name)
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}
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}
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envoyResources := convertResourceMapsToResourceArrays(pr.envoyResources)
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return envoyResources, nil
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}
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// convertResourceMapsToResourceArrays will convert map[string]map[string]proto.Message, which is used to
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// prevent duplicate resource being created, to map[string][]proto.Message which is used by Delta server.
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func convertResourceMapsToResourceArrays(resourceMap map[string]map[string]proto.Message) map[string][]proto.Message {
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resources := make(map[string][]proto.Message)
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resources[xdscommon.ListenerType] = make([]proto.Message, 0)
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resources[xdscommon.RouteType] = make([]proto.Message, 0)
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resources[xdscommon.ClusterType] = make([]proto.Message, 0)
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resources[xdscommon.EndpointType] = make([]proto.Message, 0)
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// This conversion incurs processing cost which is done once in the generating envoy resources.
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// This tradeoff is preferable to doing array scan every time an envoy resource needs to be
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// to pr.envoyResource to see if it already exists.
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for resourceTypeName, resourceMap := range resourceMap {
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for _, resource := range resourceMap {
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resources[resourceTypeName] = append(resources[resourceTypeName], resource)
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}
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}
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return resources
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}
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