344 lines
11 KiB
Go
344 lines
11 KiB
Go
package proxycfg
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import (
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"context"
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"fmt"
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"strings"
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"time"
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"github.com/hashicorp/consul/agent/cache"
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cachetype "github.com/hashicorp/consul/agent/cache-types"
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"github.com/hashicorp/consul/agent/structs"
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"github.com/hashicorp/consul/logging"
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)
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type handlerMeshGateway struct {
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handlerState
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}
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// initialize sets up the watches needed based on the current mesh gateway registration
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func (s *handlerMeshGateway) initialize(ctx context.Context) (ConfigSnapshot, error) {
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snap := newConfigSnapshotFromServiceInstance(s.serviceInstance, s.stateConfig)
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// Watch for root changes
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err := s.cache.Notify(ctx, cachetype.ConnectCARootName, &structs.DCSpecificRequest{
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Datacenter: s.source.Datacenter,
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QueryOptions: structs.QueryOptions{Token: s.token},
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Source: *s.source,
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}, rootsWatchID, s.ch)
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if err != nil {
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return snap, err
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}
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wildcardEntMeta := s.proxyID.WithWildcardNamespace()
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// Watch for all services.
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// Eventually we will have to watch connect enabled instances for each service as well as the
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// destination services themselves but those notifications will be setup later.
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// We cannot setup those watches until we know what the services are.
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err = s.cache.Notify(ctx, cachetype.CatalogServiceListName, &structs.DCSpecificRequest{
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Datacenter: s.source.Datacenter,
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QueryOptions: structs.QueryOptions{Token: s.token},
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Source: *s.source,
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EnterpriseMeta: *wildcardEntMeta,
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}, serviceListWatchID, s.ch)
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if err != nil {
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return snap, err
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}
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// Watch service-resolvers so we can setup service subset clusters
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err = s.cache.Notify(ctx, cachetype.ConfigEntriesName, &structs.ConfigEntryQuery{
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Datacenter: s.source.Datacenter,
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QueryOptions: structs.QueryOptions{Token: s.token},
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Kind: structs.ServiceResolver,
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EnterpriseMeta: *wildcardEntMeta,
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}, serviceResolversWatchID, s.ch)
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if err != nil {
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s.logger.Named(logging.MeshGateway).
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Error("failed to register watch for service-resolver config entries", "error", err)
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return snap, err
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}
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if s.proxyID.InDefaultPartition() {
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if err := s.initializeCrossDCWatches(ctx); err != nil {
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return snap, err
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}
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}
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if err := s.initializeEntWatches(ctx); err != nil {
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return snap, err
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}
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snap.MeshGateway.WatchedServices = make(map[structs.ServiceName]context.CancelFunc)
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snap.MeshGateway.WatchedGateways = make(map[string]context.CancelFunc)
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snap.MeshGateway.ServiceGroups = make(map[structs.ServiceName]structs.CheckServiceNodes)
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snap.MeshGateway.GatewayGroups = make(map[string]structs.CheckServiceNodes)
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snap.MeshGateway.ServiceResolvers = make(map[structs.ServiceName]*structs.ServiceResolverConfigEntry)
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snap.MeshGateway.HostnameDatacenters = make(map[string]structs.CheckServiceNodes)
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// there is no need to initialize the map of service resolvers as we
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// fully rebuild it every time we get updates
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return snap, err
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}
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func (s *handlerMeshGateway) initializeCrossDCWatches(ctx context.Context) error {
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if s.meta[structs.MetaWANFederationKey] == "1" {
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// Conveniently we can just use this service meta attribute in one
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// place here to set the machinery in motion and leave the conditional
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// behavior out of the rest of the package.
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err := s.cache.Notify(ctx, cachetype.FederationStateListMeshGatewaysName, &structs.DCSpecificRequest{
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Datacenter: s.source.Datacenter,
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QueryOptions: structs.QueryOptions{Token: s.token},
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Source: *s.source,
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}, federationStateListGatewaysWatchID, s.ch)
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if err != nil {
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return err
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}
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err = s.health.Notify(ctx, structs.ServiceSpecificRequest{
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Datacenter: s.source.Datacenter,
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QueryOptions: structs.QueryOptions{Token: s.token},
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ServiceName: structs.ConsulServiceName,
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}, consulServerListWatchID, s.ch)
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if err != nil {
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return err
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}
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}
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err := s.cache.Notify(ctx, cachetype.CatalogDatacentersName, &structs.DatacentersRequest{
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QueryOptions: structs.QueryOptions{Token: s.token, MaxAge: 30 * time.Second},
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}, datacentersWatchID, s.ch)
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if err != nil {
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return err
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}
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// Once we start getting notified about the datacenters we will setup watches on the
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// gateways within those other datacenters. We cannot do that here because we don't
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// know what they are yet.
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return nil
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}
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func (s *handlerMeshGateway) handleUpdate(ctx context.Context, u cache.UpdateEvent, snap *ConfigSnapshot) error {
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if u.Err != nil {
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return fmt.Errorf("error filling agent cache: %v", u.Err)
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}
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meshLogger := s.logger.Named(logging.MeshGateway)
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switch u.CorrelationID {
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case rootsWatchID:
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roots, ok := u.Result.(*structs.IndexedCARoots)
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if !ok {
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return fmt.Errorf("invalid type for response: %T", u.Result)
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}
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snap.Roots = roots
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case federationStateListGatewaysWatchID:
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dcIndexedNodes, ok := u.Result.(*structs.DatacenterIndexedCheckServiceNodes)
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if !ok {
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return fmt.Errorf("invalid type for response: %T", u.Result)
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}
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snap.MeshGateway.FedStateGateways = dcIndexedNodes.DatacenterNodes
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for dc, nodes := range dcIndexedNodes.DatacenterNodes {
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snap.MeshGateway.HostnameDatacenters[dc] = hostnameEndpoints(
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s.logger.Named(logging.MeshGateway),
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snap.Locality,
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nodes,
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)
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}
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for dc := range snap.MeshGateway.HostnameDatacenters {
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if _, ok := dcIndexedNodes.DatacenterNodes[dc]; !ok {
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delete(snap.MeshGateway.HostnameDatacenters, dc)
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}
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}
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case serviceListWatchID:
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services, ok := u.Result.(*structs.IndexedServiceList)
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if !ok {
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return fmt.Errorf("invalid type for response: %T", u.Result)
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}
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svcMap := make(map[structs.ServiceName]struct{})
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for _, svc := range services.Services {
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// Make sure to add every service to this map, we use it to cancel
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// watches below.
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svcMap[svc] = struct{}{}
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if _, ok := snap.MeshGateway.WatchedServices[svc]; !ok {
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ctx, cancel := context.WithCancel(ctx)
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err := s.health.Notify(ctx, structs.ServiceSpecificRequest{
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Datacenter: s.source.Datacenter,
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QueryOptions: structs.QueryOptions{Token: s.token},
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ServiceName: svc.Name,
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Connect: true,
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EnterpriseMeta: svc.EnterpriseMeta,
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}, fmt.Sprintf("connect-service:%s", svc.String()), s.ch)
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if err != nil {
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meshLogger.Error("failed to register watch for connect-service",
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"service", svc.String(),
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"error", err,
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)
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cancel()
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return err
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}
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snap.MeshGateway.WatchedServices[svc] = cancel
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}
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}
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for sid, cancelFn := range snap.MeshGateway.WatchedServices {
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if _, ok := svcMap[sid]; !ok {
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meshLogger.Debug("canceling watch for service", "service", sid.String())
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// TODO (gateways) Should the sid also be deleted from snap.MeshGateway.ServiceGroups?
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// Do those endpoints get cleaned up some other way?
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delete(snap.MeshGateway.WatchedServices, sid)
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cancelFn()
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}
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}
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snap.MeshGateway.WatchedServicesSet = true
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case datacentersWatchID:
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datacentersRaw, ok := u.Result.(*[]string)
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if !ok {
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return fmt.Errorf("invalid type for response: %T", u.Result)
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}
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if datacentersRaw == nil {
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return fmt.Errorf("invalid response with a nil datacenter list")
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}
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datacenters := *datacentersRaw
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for _, dc := range datacenters {
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if dc == s.source.Datacenter {
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continue
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}
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entMeta := structs.DefaultEnterpriseMetaInDefaultPartition()
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gk := GatewayKey{Datacenter: dc, Partition: entMeta.PartitionOrDefault()}
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if _, ok := snap.MeshGateway.WatchedGateways[gk.String()]; !ok {
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ctx, cancel := context.WithCancel(ctx)
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err := s.cache.Notify(ctx, cachetype.InternalServiceDumpName, &structs.ServiceDumpRequest{
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Datacenter: dc,
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QueryOptions: structs.QueryOptions{Token: s.token},
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ServiceKind: structs.ServiceKindMeshGateway,
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UseServiceKind: true,
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Source: *s.source,
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EnterpriseMeta: *entMeta,
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}, fmt.Sprintf("mesh-gateway:%s", gk.String()), s.ch)
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if err != nil {
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meshLogger.Error("failed to register watch for mesh-gateway",
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"datacenter", dc,
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"partition", entMeta.PartitionOrDefault(),
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"error", err,
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)
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cancel()
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return err
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}
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snap.MeshGateway.WatchedGateways[gk.String()] = cancel
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}
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}
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for key, cancelFn := range snap.MeshGateway.WatchedGateways {
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gk := gatewayKeyFromString(key)
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if gk.Datacenter == s.source.Datacenter {
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// Only cross-DC watches are managed by the datacenters watch.
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continue
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}
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found := false
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for _, dcCurrent := range datacenters {
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if dcCurrent == gk.Datacenter {
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found = true
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break
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}
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}
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if !found {
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delete(snap.MeshGateway.WatchedGateways, key)
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cancelFn()
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}
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}
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case serviceResolversWatchID:
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configEntries, ok := u.Result.(*structs.IndexedConfigEntries)
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if !ok {
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return fmt.Errorf("invalid type for response: %T", u.Result)
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}
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resolvers := make(map[structs.ServiceName]*structs.ServiceResolverConfigEntry)
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for _, entry := range configEntries.Entries {
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if resolver, ok := entry.(*structs.ServiceResolverConfigEntry); ok {
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resolvers[structs.NewServiceName(resolver.Name, &resolver.EnterpriseMeta)] = resolver
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}
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}
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snap.MeshGateway.ServiceResolvers = resolvers
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case consulServerListWatchID:
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resp, ok := u.Result.(*structs.IndexedCheckServiceNodes)
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if !ok {
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return fmt.Errorf("invalid type for response: %T", u.Result)
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}
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// Do some initial sanity checks to avoid doing something dumb.
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for _, csn := range resp.Nodes {
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if csn.Service.Service != structs.ConsulServiceName {
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return fmt.Errorf("expected service name %q but got %q",
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structs.ConsulServiceName, csn.Service.Service)
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}
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if csn.Node.Datacenter != snap.Datacenter {
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return fmt.Errorf("expected datacenter %q but got %q",
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snap.Datacenter, csn.Node.Datacenter)
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}
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}
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snap.MeshGateway.ConsulServers = resp.Nodes
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default:
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switch {
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case strings.HasPrefix(u.CorrelationID, "connect-service:"):
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resp, ok := u.Result.(*structs.IndexedCheckServiceNodes)
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if !ok {
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return fmt.Errorf("invalid type for response: %T", u.Result)
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}
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sn := structs.ServiceNameFromString(strings.TrimPrefix(u.CorrelationID, "connect-service:"))
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if len(resp.Nodes) > 0 {
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snap.MeshGateway.ServiceGroups[sn] = resp.Nodes
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} else if _, ok := snap.MeshGateway.ServiceGroups[sn]; ok {
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delete(snap.MeshGateway.ServiceGroups, sn)
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}
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case strings.HasPrefix(u.CorrelationID, "mesh-gateway:"):
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resp, ok := u.Result.(*structs.IndexedNodesWithGateways)
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if !ok {
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return fmt.Errorf("invalid type for response: %T", u.Result)
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}
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key := strings.TrimPrefix(u.CorrelationID, "mesh-gateway:")
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delete(snap.MeshGateway.GatewayGroups, key)
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delete(snap.MeshGateway.HostnameDatacenters, key)
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if len(resp.Nodes) > 0 {
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snap.MeshGateway.GatewayGroups[key] = resp.Nodes
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snap.MeshGateway.HostnameDatacenters[key] = hostnameEndpoints(
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s.logger.Named(logging.MeshGateway),
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snap.Locality,
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resp.Nodes,
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)
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}
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default:
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if err := s.handleEntUpdate(meshLogger, ctx, u, snap); err != nil {
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return err
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}
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}
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}
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return nil
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}
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