452 lines
15 KiB
Go
452 lines
15 KiB
Go
package xds
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import (
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"encoding/json"
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"errors"
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"fmt"
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"time"
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envoy "github.com/envoyproxy/go-control-plane/envoy/api/v2"
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envoyauth "github.com/envoyproxy/go-control-plane/envoy/api/v2/auth"
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envoycluster "github.com/envoyproxy/go-control-plane/envoy/api/v2/cluster"
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envoycore "github.com/envoyproxy/go-control-plane/envoy/api/v2/core"
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envoyendpoint "github.com/envoyproxy/go-control-plane/envoy/api/v2/endpoint"
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envoytype "github.com/envoyproxy/go-control-plane/envoy/type"
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"github.com/gogo/protobuf/jsonpb"
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"github.com/gogo/protobuf/proto"
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"github.com/gogo/protobuf/types"
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"github.com/hashicorp/consul/agent/connect"
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"github.com/hashicorp/consul/agent/proxycfg"
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"github.com/hashicorp/consul/agent/structs"
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)
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// clustersFromSnapshot returns the xDS API representation of the "clusters" in the snapshot.
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func (s *Server) clustersFromSnapshot(cfgSnap *proxycfg.ConfigSnapshot, token string) ([]proto.Message, error) {
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if cfgSnap == nil {
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return nil, errors.New("nil config given")
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}
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switch cfgSnap.Kind {
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case structs.ServiceKindConnectProxy:
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return s.clustersFromSnapshotConnectProxy(cfgSnap, token)
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case structs.ServiceKindMeshGateway:
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return s.clustersFromSnapshotMeshGateway(cfgSnap, token)
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default:
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return nil, fmt.Errorf("Invalid service kind: %v", cfgSnap.Kind)
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}
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}
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// clustersFromSnapshot returns the xDS API representation of the "clusters"
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// (upstreams) in the snapshot.
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func (s *Server) clustersFromSnapshotConnectProxy(cfgSnap *proxycfg.ConfigSnapshot, token string) ([]proto.Message, error) {
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// TODO(rb): this sizing is a low bound.
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clusters := make([]proto.Message, 0, len(cfgSnap.Proxy.Upstreams)+1)
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// Include the "app" cluster for the public listener
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appCluster, err := s.makeAppCluster(cfgSnap, LocalAppClusterName, "", cfgSnap.Proxy.LocalServicePort)
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if err != nil {
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return nil, err
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}
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clusters = append(clusters, appCluster)
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for _, u := range cfgSnap.Proxy.Upstreams {
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id := u.Identifier()
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if u.DestinationType == structs.UpstreamDestTypePreparedQuery {
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upstreamCluster, err := s.makeUpstreamClusterForPreparedQuery(u, cfgSnap)
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if err != nil {
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return nil, err
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}
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clusters = append(clusters, upstreamCluster)
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} else {
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chain := cfgSnap.ConnectProxy.DiscoveryChain[id]
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upstreamClusters, err := s.makeUpstreamClustersForDiscoveryChain(u, chain, cfgSnap)
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if err != nil {
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return nil, err
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}
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for _, cluster := range upstreamClusters {
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clusters = append(clusters, cluster)
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}
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}
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}
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cfgSnap.Proxy.Expose.Finalize(s.Logger)
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paths := cfgSnap.Proxy.Expose.Paths
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// Add service health checks to the list of paths to create clusters for if needed
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if cfgSnap.Proxy.Expose.Checks {
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for _, check := range s.CheckFetcher.ServiceHTTPBasedChecks(cfgSnap.Proxy.DestinationServiceID) {
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p, err := parseCheckPath(check)
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if err != nil {
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s.Logger.Printf("[WARN] envoy: failed to create cluster for check '%s': %v", check.CheckID, err)
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continue
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}
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paths = append(paths, p)
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}
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}
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// Create a new cluster if we need to expose a port that is different from the service port
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for _, path := range paths {
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if path.LocalPathPort == cfgSnap.Proxy.LocalServicePort {
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continue
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}
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c, err := s.makeAppCluster(cfgSnap, makeExposeClusterName(path.LocalPathPort), path.Protocol, path.LocalPathPort)
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if err != nil {
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s.Logger.Printf("[WARN] envoy: failed to make local cluster for '%s': %s", path.Path, err)
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continue
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}
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clusters = append(clusters, c)
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}
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return clusters, nil
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}
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func makeExposeClusterName(destinationPort int) string {
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return fmt.Sprintf("exposed_cluster_%d", destinationPort)
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}
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// clustersFromSnapshotMeshGateway returns the xDS API representation of the "clusters"
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// for a mesh gateway. This will include 1 cluster per remote datacenter as well as
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// 1 cluster for each service subset.
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func (s *Server) clustersFromSnapshotMeshGateway(cfgSnap *proxycfg.ConfigSnapshot, token string) ([]proto.Message, error) {
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// 1 cluster per remote dc + 1 cluster per local service (this is a lower bound - all subset specific clusters will be appended)
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clusters := make([]proto.Message, 0, len(cfgSnap.MeshGateway.GatewayGroups)+len(cfgSnap.MeshGateway.ServiceGroups))
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// generate the remote dc clusters
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for dc, _ := range cfgSnap.MeshGateway.GatewayGroups {
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clusterName := connect.DatacenterSNI(dc, cfgSnap.Roots.TrustDomain)
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cluster, err := s.makeMeshGatewayCluster(clusterName, cfgSnap)
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if err != nil {
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return nil, err
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}
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clusters = append(clusters, cluster)
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}
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// generate the per-service clusters
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for svc, _ := range cfgSnap.MeshGateway.ServiceGroups {
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clusterName := connect.ServiceSNI(svc, "", "default", cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain)
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cluster, err := s.makeMeshGatewayCluster(clusterName, cfgSnap)
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if err != nil {
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return nil, err
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}
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clusters = append(clusters, cluster)
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}
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// generate the service subset clusters
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for svc, resolver := range cfgSnap.MeshGateway.ServiceResolvers {
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for subsetName, _ := range resolver.Subsets {
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clusterName := connect.ServiceSNI(svc, subsetName, "default", cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain)
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cluster, err := s.makeMeshGatewayCluster(clusterName, cfgSnap)
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if err != nil {
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return nil, err
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}
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clusters = append(clusters, cluster)
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}
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}
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return clusters, nil
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}
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func (s *Server) makeAppCluster(cfgSnap *proxycfg.ConfigSnapshot, name, pathProtocol string, port int) (*envoy.Cluster, error) {
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var c *envoy.Cluster
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var err error
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cfg, err := ParseProxyConfig(cfgSnap.Proxy.Config)
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if err != nil {
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// Don't hard fail on a config typo, just warn. The parse func returns
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// default config if there is an error so it's safe to continue.
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s.Logger.Printf("[WARN] envoy: failed to parse Connect.Proxy.Config: %s", err)
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}
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// If we have overridden local cluster config try to parse it into an Envoy cluster
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if cfg.LocalClusterJSON != "" {
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return makeClusterFromUserConfig(cfg.LocalClusterJSON)
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}
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addr := cfgSnap.Proxy.LocalServiceAddress
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if addr == "" {
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addr = "127.0.0.1"
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}
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c = &envoy.Cluster{
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Name: name,
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ConnectTimeout: time.Duration(cfg.LocalConnectTimeoutMs) * time.Millisecond,
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ClusterDiscoveryType: &envoy.Cluster_Type{Type: envoy.Cluster_STATIC},
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LoadAssignment: &envoy.ClusterLoadAssignment{
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ClusterName: name,
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Endpoints: []envoyendpoint.LocalityLbEndpoints{
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{
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LbEndpoints: []envoyendpoint.LbEndpoint{
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makeEndpoint(name,
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addr,
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port),
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},
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},
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},
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},
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}
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if cfg.Protocol == "http2" || cfg.Protocol == "grpc" || pathProtocol == "http2" {
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c.Http2ProtocolOptions = &envoycore.Http2ProtocolOptions{}
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}
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return c, err
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}
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func (s *Server) makeUpstreamClusterForPreparedQuery(upstream structs.Upstream, cfgSnap *proxycfg.ConfigSnapshot) (*envoy.Cluster, error) {
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var c *envoy.Cluster
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var err error
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dc := upstream.Datacenter
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if dc == "" {
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dc = cfgSnap.Datacenter
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}
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sni := connect.UpstreamSNI(&upstream, "", dc, cfgSnap.Roots.TrustDomain)
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cfg, err := ParseUpstreamConfig(upstream.Config)
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if err != nil {
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// Don't hard fail on a config typo, just warn. The parse func returns
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// default config if there is an error so it's safe to continue.
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s.Logger.Printf("[WARN] envoy: failed to parse Upstream[%s].Config: %s",
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upstream.Identifier(), err)
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}
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if cfg.ClusterJSON != "" {
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c, err = makeClusterFromUserConfig(cfg.ClusterJSON)
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if err != nil {
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return c, err
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}
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// In the happy path don't return yet as we need to inject TLS config still.
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}
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if c == nil {
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c = &envoy.Cluster{
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Name: sni,
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ConnectTimeout: time.Duration(cfg.ConnectTimeoutMs) * time.Millisecond,
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ClusterDiscoveryType: &envoy.Cluster_Type{Type: envoy.Cluster_EDS},
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EdsClusterConfig: &envoy.Cluster_EdsClusterConfig{
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EdsConfig: &envoycore.ConfigSource{
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ConfigSourceSpecifier: &envoycore.ConfigSource_Ads{
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Ads: &envoycore.AggregatedConfigSource{},
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},
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},
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},
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// Having an empty config enables outlier detection with default config.
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OutlierDetection: &envoycluster.OutlierDetection{},
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}
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if cfg.Protocol == "http2" || cfg.Protocol == "grpc" {
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c.Http2ProtocolOptions = &envoycore.Http2ProtocolOptions{}
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}
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}
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// Enable TLS upstream with the configured client certificate.
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c.TlsContext = &envoyauth.UpstreamTlsContext{
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CommonTlsContext: makeCommonTLSContext(cfgSnap),
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Sni: sni,
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}
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return c, nil
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}
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func (s *Server) makeUpstreamClustersForDiscoveryChain(
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upstream structs.Upstream,
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chain *structs.CompiledDiscoveryChain,
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cfgSnap *proxycfg.ConfigSnapshot,
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) ([]*envoy.Cluster, error) {
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if chain == nil {
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return nil, fmt.Errorf("cannot create upstream cluster without discovery chain")
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}
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cfg, err := ParseUpstreamConfigNoDefaults(upstream.Config)
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if err != nil {
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// Don't hard fail on a config typo, just warn. The parse func returns
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// default config if there is an error so it's safe to continue.
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s.Logger.Printf("[WARN] envoy: failed to parse Upstream[%s].Config: %s",
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upstream.Identifier(), err)
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}
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var escapeHatchCluster *envoy.Cluster
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if cfg.ClusterJSON != "" {
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if chain.IsDefault() {
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// If you haven't done anything to setup the discovery chain, then
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// you can use the envoy_cluster_json escape hatch.
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escapeHatchCluster, err = makeClusterFromUserConfig(cfg.ClusterJSON)
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if err != nil {
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return nil, err
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}
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} else {
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s.Logger.Printf("[WARN] envoy: ignoring escape hatch setting Upstream[%s].Config[%s] because a discovery chain for %q is configured",
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upstream.Identifier(), "envoy_cluster_json", chain.ServiceName)
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}
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}
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id := upstream.Identifier()
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chainEndpointMap, ok := cfgSnap.ConnectProxy.WatchedUpstreamEndpoints[id]
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if !ok {
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// this should not happen
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return nil, fmt.Errorf("no endpoint map for upstream %q", id)
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}
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var out []*envoy.Cluster
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for _, node := range chain.Nodes {
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if node.Type != structs.DiscoveryGraphNodeTypeResolver {
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continue
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}
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failover := node.Resolver.Failover
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targetID := node.Resolver.Target
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target := chain.Targets[targetID]
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// Determine if we have to generate the entire cluster differently.
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failoverThroughMeshGateway := chain.WillFailoverThroughMeshGateway(node)
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sni := target.SNI
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clusterName := CustomizeClusterName(target.Name, chain)
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if failoverThroughMeshGateway {
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actualTargetID := firstHealthyTarget(
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chain.Targets,
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chainEndpointMap,
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targetID,
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failover.Targets,
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)
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if actualTargetID != targetID {
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actualTarget := chain.Targets[actualTargetID]
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sni = actualTarget.SNI
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}
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}
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s.Logger.Printf("[DEBUG] xds.clusters - generating cluster for %s", clusterName)
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c := &envoy.Cluster{
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Name: clusterName,
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AltStatName: clusterName,
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ConnectTimeout: node.Resolver.ConnectTimeout,
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ClusterDiscoveryType: &envoy.Cluster_Type{Type: envoy.Cluster_EDS},
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CommonLbConfig: &envoy.Cluster_CommonLbConfig{
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HealthyPanicThreshold: &envoytype.Percent{
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Value: 0, // disable panic threshold
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},
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},
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EdsClusterConfig: &envoy.Cluster_EdsClusterConfig{
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EdsConfig: &envoycore.ConfigSource{
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ConfigSourceSpecifier: &envoycore.ConfigSource_Ads{
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Ads: &envoycore.AggregatedConfigSource{},
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},
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},
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},
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// Having an empty config enables outlier detection with default config.
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OutlierDetection: &envoycluster.OutlierDetection{},
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}
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proto := cfg.Protocol
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if proto == "" {
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proto = chain.Protocol
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}
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if proto == "" {
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proto = "tcp"
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}
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if proto == "http2" || proto == "grpc" {
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c.Http2ProtocolOptions = &envoycore.Http2ProtocolOptions{}
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}
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// Enable TLS upstream with the configured client certificate.
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c.TlsContext = &envoyauth.UpstreamTlsContext{
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CommonTlsContext: makeCommonTLSContext(cfgSnap),
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Sni: sni,
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}
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out = append(out, c)
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}
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if escapeHatchCluster != nil {
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if len(out) != 1 {
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return nil, fmt.Errorf("cannot inject escape hatch cluster when discovery chain had no nodes")
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}
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defaultCluster := out[0]
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// Overlay what the user provided.
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escapeHatchCluster.TlsContext = defaultCluster.TlsContext
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out = []*envoy.Cluster{escapeHatchCluster}
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}
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return out, nil
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}
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// makeClusterFromUserConfig returns the listener config decoded from an
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// arbitrary proto3 json format string or an error if it's invalid.
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//
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// For now we only support embedding in JSON strings because of the hcl parsing
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// pain (see config.go comment above call to PatchSliceOfMaps). Until we
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// refactor config parser a _lot_ user's opaque config that contains arrays will
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// be mangled. We could actually fix that up in mapstructure which knows the
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// type of the target so could resolve the slices to singletons unambiguously
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// and it would work for us here... but we still have the problem that the
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// config would render incorrectly in general in our HTTP API responses so we
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// really need to fix it "properly".
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//
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// When we do that we can support just nesting the config directly into the
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// JSON/hcl naturally but this is a stop-gap that gets us an escape hatch
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// immediately. It's also probably not a bad thing to support long-term since
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// any config generated by other systems will likely be in canonical protobuf
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// from rather than our slight variant in JSON/hcl.
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func makeClusterFromUserConfig(configJSON string) (*envoy.Cluster, error) {
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var jsonFields map[string]*json.RawMessage
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if err := json.Unmarshal([]byte(configJSON), &jsonFields); err != nil {
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fmt.Println("Custom error", err, configJSON)
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return nil, err
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}
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var c envoy.Cluster
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if _, ok := jsonFields["@type"]; ok {
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// Type field is present so decode it as a types.Any
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var any types.Any
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err := jsonpb.UnmarshalString(configJSON, &any)
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if err != nil {
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return nil, err
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}
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// And then unmarshal the listener again...
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err = proto.Unmarshal(any.Value, &c)
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if err != nil {
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return nil, err
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}
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return &c, err
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}
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// No @type so try decoding as a straight listener.
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err := jsonpb.UnmarshalString(configJSON, &c)
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return &c, err
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}
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func (s *Server) makeMeshGatewayCluster(clusterName string, cfgSnap *proxycfg.ConfigSnapshot) (*envoy.Cluster, error) {
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cfg, err := ParseMeshGatewayConfig(cfgSnap.Proxy.Config)
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if err != nil {
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// Don't hard fail on a config typo, just warn. The parse func returns
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// default config if there is an error so it's safe to continue.
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s.Logger.Printf("[WARN] envoy: failed to parse mesh gateway config: %s", err)
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}
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return &envoy.Cluster{
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Name: clusterName,
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ConnectTimeout: time.Duration(cfg.ConnectTimeoutMs) * time.Millisecond,
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ClusterDiscoveryType: &envoy.Cluster_Type{Type: envoy.Cluster_EDS},
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EdsClusterConfig: &envoy.Cluster_EdsClusterConfig{
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EdsConfig: &envoycore.ConfigSource{
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ConfigSourceSpecifier: &envoycore.ConfigSource_Ads{
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Ads: &envoycore.AggregatedConfigSource{},
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},
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},
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},
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// Having an empty config enables outlier detection with default config.
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OutlierDetection: &envoycluster.OutlierDetection{},
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}, nil
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}
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