open-consul/agent/proxycfg-glue/config_entry.go

// Copyright (c) HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package proxycfgglue

import (
	"context"
	"fmt"

	"github.com/hashicorp/consul/agent/cache"
	cachetype "github.com/hashicorp/consul/agent/cache-types"
	"github.com/hashicorp/consul/agent/proxycfg"
	"github.com/hashicorp/consul/agent/rpcclient/configentry"
	"github.com/hashicorp/consul/agent/structs"
	"github.com/hashicorp/consul/agent/submatview"
	"github.com/hashicorp/consul/proto/private/pbsubscribe"
)

// CacheConfigEntry satisfies the proxycfg.ConfigEntry interface by sourcing
// data from the agent cache.
func CacheConfigEntry(c *cache.Cache) proxycfg.ConfigEntry {
	return &cacheProxyDataSource[*structs.ConfigEntryQuery]{c, cachetype.ConfigEntryName}
}

// CacheConfigEntryList satisfies the proxycfg.ConfigEntryList interface by
// sourcing data from the agent cache.
func CacheConfigEntryList(c *cache.Cache) proxycfg.ConfigEntryList {
	return &cacheProxyDataSource[*structs.ConfigEntryQuery]{c, cachetype.ConfigEntryListName}
}

// ServerConfigEntry satisfies the proxycfg.ConfigEntry interface by sourcing
// data from a local materialized view (backed by an EventPublisher subscription).
func ServerConfigEntry(deps ServerDataSourceDeps) proxycfg.ConfigEntry {
	return serverConfigEntry{deps}
}

// ServerConfigEntryList satisfies the proxycfg.ConfigEntry interface by sourcing
// data from a local materialized view (backed by an EventPublisher subscription).
func ServerConfigEntryList(deps ServerDataSourceDeps) proxycfg.ConfigEntryList {
	return serverConfigEntry{deps}
}

type serverConfigEntry struct {
	deps ServerDataSourceDeps
}

func (e serverConfigEntry) Notify(ctx context.Context, req *structs.ConfigEntryQuery, correlationID string, ch chan<- proxycfg.UpdateEvent) error {
	cfgReq, err := newConfigEntryRequest(req, e.deps)
	if err != nil {
		return err
	}
	return e.deps.ViewStore.NotifyCallback(ctx, cfgReq, correlationID, dispatchCacheUpdate(ch))
}

func newConfigEntryRequest(req *structs.ConfigEntryQuery, deps ServerDataSourceDeps) (*configEntryRequest, error) {
	var topic pbsubscribe.Topic
	switch req.Kind {
	case structs.MeshConfig:
		topic = pbsubscribe.Topic_MeshConfig
	case structs.ServiceResolver:
		topic = pbsubscribe.Topic_ServiceResolver
	case structs.IngressGateway:
		topic = pbsubscribe.Topic_IngressGateway
	case structs.ServiceDefaults:
		topic = pbsubscribe.Topic_ServiceDefaults