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endpoints.go
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endpoints.go
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package xds
import (
"errors"
"fmt"
"strconv"
envoy_cluster_v3 "github.com/envoyproxy/go-control-plane/envoy/config/cluster/v3"
envoy_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
envoy_endpoint_v3 "github.com/envoyproxy/go-control-plane/envoy/config/endpoint/v3"
"github.com/hashicorp/consul/envoyextensions/xdscommon"
"github.com/hashicorp/go-bexpr"
"google.golang.org/protobuf/proto"
"github.com/hashicorp/consul/agent/connect"
"github.com/hashicorp/consul/agent/proxycfg"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
)
const (
UnnamedSubset = ""
)
// endpointsFromSnapshot returns the xDS API representation of the "endpoints"
func (s *ResourceGenerator) endpointsFromSnapshot(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
if cfgSnap == nil {
return nil, errors.New("nil config given")
}
switch cfgSnap.Kind {
case structs.ServiceKindConnectProxy:
return s.endpointsFromSnapshotConnectProxy(cfgSnap)
case structs.ServiceKindTerminatingGateway:
return s.endpointsFromSnapshotTerminatingGateway(cfgSnap)
case structs.ServiceKindMeshGateway:
return s.endpointsFromSnapshotMeshGateway(cfgSnap)
case structs.ServiceKindIngressGateway:
return s.endpointsFromSnapshotIngressGateway(cfgSnap)
case structs.ServiceKindAPIGateway:
// TODO Find a cleaner solution, can't currently pass unexported property types
var err error
cfgSnap.IngressGateway, err = cfgSnap.APIGateway.ToIngress(cfgSnap.Datacenter)
if err != nil {
return nil, err
}
return s.endpointsFromSnapshotIngressGateway(cfgSnap)
default:
return nil, fmt.Errorf("Invalid service kind: %v", cfgSnap.Kind)
}
}
// endpointsFromSnapshotConnectProxy returns the xDS API representation of the "endpoints"
// (upstream instances) in the snapshot.
func (s *ResourceGenerator) endpointsFromSnapshotConnectProxy(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
// TODO: this estimate is wrong
resources := make([]proto.Message, 0,
len(cfgSnap.ConnectProxy.PreparedQueryEndpoints)+
cfgSnap.ConnectProxy.PeerUpstreamEndpoints.Len()+
len(cfgSnap.ConnectProxy.WatchedUpstreamEndpoints))
// NOTE: Any time we skip a chain below we MUST also skip that discovery chain in clusters.go
// so that the sets of endpoints generated matches the sets of clusters.
for uid, chain := range cfgSnap.ConnectProxy.DiscoveryChain {
upstream, skip := cfgSnap.ConnectProxy.GetUpstream(uid, &cfgSnap.ProxyID.EnterpriseMeta)
if skip {
// Discovery chain is not associated with a known explicit or implicit upstream so it is skipped.
continue
}
var upstreamConfigMap map[string]interface{}
if upstream != nil {
upstreamConfigMap = upstream.Config
}
es, err := s.endpointsFromDiscoveryChain(
uid,
chain,
cfgSnap,
cfgSnap.Locality,
upstreamConfigMap,
cfgSnap.ConnectProxy.WatchedUpstreamEndpoints[uid],
cfgSnap.ConnectProxy.WatchedGatewayEndpoints[uid],
false,
)
if err != nil {
return nil, err
}
resources = append(resources, es...)
}
// NOTE: Any time we skip an upstream below we MUST also skip that same
// upstream in clusters.go so that the sets of endpoints generated matches
// the sets of clusters.
for _, uid := range cfgSnap.ConnectProxy.PeeredUpstreamIDs() {
upstream, skip := cfgSnap.ConnectProxy.GetUpstream(uid, &cfgSnap.ProxyID.EnterpriseMeta)
if skip {
// Discovery chain is not associated with a known explicit or implicit upstream so it is skipped.
continue
}
tbs, ok := cfgSnap.ConnectProxy.UpstreamPeerTrustBundles.Get(uid.Peer)
if !ok {
// this should never happen since we loop through upstreams with
// set trust bundles
return nil, fmt.Errorf("trust bundle not ready for peer %s", uid.Peer)
}
clusterName := generatePeeredClusterName(uid, tbs)
mgwMode := structs.MeshGatewayModeDefault
if upstream != nil {
mgwMode = upstream.MeshGateway.Mode
}
loadAssignment, err := s.makeUpstreamLoadAssignmentForPeerService(cfgSnap, clusterName, uid, mgwMode)
if err != nil {
return nil, err
}
if loadAssignment != nil {
resources = append(resources, loadAssignment)
}
}
// Looping over explicit upstreams is only needed for prepared queries because they do not have discovery chains
for _, u := range cfgSnap.Proxy.Upstreams {
if u.DestinationType != structs.UpstreamDestTypePreparedQuery {
continue
}
uid := proxycfg.NewUpstreamID(&u)
dc := u.Datacenter
if dc == "" {
dc = cfgSnap.Datacenter
}
clusterName := connect.UpstreamSNI(&u, "", dc, cfgSnap.Roots.TrustDomain)
endpoints, ok := cfgSnap.ConnectProxy.PreparedQueryEndpoints[uid]
if ok {
la := makeLoadAssignment(
clusterName,
[]loadAssignmentEndpointGroup{
{Endpoints: endpoints},
},
cfgSnap.Locality,
)
resources = append(resources, la)
}
}
// Loop over potential destinations in the mesh, then grab the gateway nodes associated with each
cfgSnap.ConnectProxy.DestinationsUpstream.ForEachKey(func(uid proxycfg.UpstreamID) bool {
svcConfig, ok := cfgSnap.ConnectProxy.DestinationsUpstream.Get(uid)
if !ok || svcConfig.Destination == nil {
return true
}
for _, address := range svcConfig.Destination.Addresses {
name := clusterNameForDestination(cfgSnap, uid.Name, address, uid.NamespaceOrDefault(), uid.PartitionOrDefault())
endpoints, ok := cfgSnap.ConnectProxy.DestinationGateways.Get(uid)
if ok {
la := makeLoadAssignment(
name,
[]loadAssignmentEndpointGroup{
{Endpoints: endpoints},
},
proxycfg.GatewayKey{ /*empty so it never matches*/ },
)
resources = append(resources, la)
}
}
return true
})
return resources, nil
}
func (s *ResourceGenerator) filterSubsetEndpoints(subset *structs.ServiceResolverSubset, endpoints structs.CheckServiceNodes) (structs.CheckServiceNodes, error) {
// locally execute the subsets filter
if subset.Filter != "" {
filter, err := bexpr.CreateFilter(subset.Filter, nil, endpoints)
if err != nil {
return nil, err
}
raw, err := filter.Execute(endpoints)
if err != nil {
return nil, err
}
return raw.(structs.CheckServiceNodes), nil
}
return endpoints, nil
}
func (s *ResourceGenerator) endpointsFromSnapshotTerminatingGateway(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
return s.endpointsFromServicesAndResolvers(cfgSnap, cfgSnap.TerminatingGateway.ServiceGroups, cfgSnap.TerminatingGateway.ServiceResolvers)
}
func (s *ResourceGenerator) endpointsFromSnapshotMeshGateway(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
keys := cfgSnap.MeshGateway.GatewayKeys()
// Allocation count (this is a lower bound - all subset specific clusters will be appended):
// 1 cluster per remote dc/partition
// 1 cluster per local service
// 1 cluster per unique peer server (control plane traffic)
resources := make([]proto.Message, 0, len(keys)+len(cfgSnap.MeshGateway.ServiceGroups)+len(cfgSnap.MeshGateway.PeerServers))
for _, key := range keys {
if key.Matches(cfgSnap.Datacenter, cfgSnap.ProxyID.PartitionOrDefault()) {
continue // skip local
}
// Also skip gateways with a hostname as their address. EDS cannot resolve hostnames,
// so we provide them through CDS instead.
if len(cfgSnap.MeshGateway.HostnameDatacenters[key.String()]) > 0 {
continue
}
endpoints := cfgSnap.GetMeshGatewayEndpoints(key)
if len(endpoints) == 0 {
s.Logger.Error("skipping mesh gateway endpoints because no definition found", "datacenter", key)
continue
}
{ // standard connect
clusterName := connect.GatewaySNI(key.Datacenter, key.Partition, cfgSnap.Roots.TrustDomain)
la := makeLoadAssignment(
clusterName,
[]loadAssignmentEndpointGroup{
{Endpoints: endpoints},
},
cfgSnap.Locality,
)
resources = append(resources, la)
}
if cfgSnap.ProxyID.InDefaultPartition() &&
cfgSnap.ServiceMeta[structs.MetaWANFederationKey] == "1" &&
cfgSnap.ServerSNIFn != nil {
clusterName := cfgSnap.ServerSNIFn(key.Datacenter, "")
la := makeLoadAssignment(
clusterName,
[]loadAssignmentEndpointGroup{
{Endpoints: endpoints},
},
cfgSnap.Locality,
)
resources = append(resources, la)
}
}
// generate endpoints for our servers if WAN federation is enabled
if cfgSnap.ProxyID.InDefaultPartition() &&
cfgSnap.ServiceMeta[structs.MetaWANFederationKey] == "1" &&
cfgSnap.ServerSNIFn != nil {
var allServersLbEndpoints []*envoy_endpoint_v3.LbEndpoint
servers, _ := cfgSnap.MeshGateway.WatchedLocalServers.Get(structs.ConsulServiceName)
for _, srv := range servers {
clusterName := cfgSnap.ServerSNIFn(cfgSnap.Datacenter, srv.Node.Node)
_, addr, port := srv.BestAddress(false /*wan*/)
lbEndpoint := &envoy_endpoint_v3.LbEndpoint{
HostIdentifier: &envoy_endpoint_v3.LbEndpoint_Endpoint{
Endpoint: &envoy_endpoint_v3.Endpoint{
Address: makeAddress(addr, port),
},
},
HealthStatus: envoy_core_v3.HealthStatus_UNKNOWN,
}
cla := &envoy_endpoint_v3.ClusterLoadAssignment{
ClusterName: clusterName,
Endpoints: []*envoy_endpoint_v3.LocalityLbEndpoints{{
LbEndpoints: []*envoy_endpoint_v3.LbEndpoint{lbEndpoint},
}},
}
allServersLbEndpoints = append(allServersLbEndpoints, lbEndpoint)
resources = append(resources, cla)
}
// And add one catch all so that remote datacenters can dial ANY server
// in this datacenter without knowing its name.
resources = append(resources, &envoy_endpoint_v3.ClusterLoadAssignment{
ClusterName: cfgSnap.ServerSNIFn(cfgSnap.Datacenter, ""),
Endpoints: []*envoy_endpoint_v3.LocalityLbEndpoints{{
LbEndpoints: allServersLbEndpoints,
}},
})
}
// Create endpoints for the cluster where local servers will be dialed by peers.
// When peering through gateways we load balance across the local servers. They cannot be addressed individually.
if cfg := cfgSnap.MeshConfig(); cfg.PeerThroughMeshGateways() {
var serverEndpoints []*envoy_endpoint_v3.LbEndpoint
servers, _ := cfgSnap.MeshGateway.WatchedLocalServers.Get(structs.ConsulServiceName)
for _, srv := range servers {
if isReplica := srv.Service.Meta["read_replica"]; isReplica == "true" {
// Peering control-plane traffic can only ever be handled by the local leader.
// We avoid routing to read replicas since they will never be Raft voters.
continue
}
_, addr, _ := srv.BestAddress(false)
portStr, ok := srv.Service.Meta["grpc_tls_port"]
if !ok {
s.Logger.Warn("peering is enabled but local server %q does not have the required gRPC TLS port configured",
"server", srv.Node.Node)
continue
}
port, err := strconv.Atoi(portStr)
if err != nil {
s.Logger.Error("peering is enabled but local server has invalid gRPC TLS port",
"server", srv.Node.Node, "port", portStr, "error", err)
continue
}
serverEndpoints = append(serverEndpoints, &envoy_endpoint_v3.LbEndpoint{
HostIdentifier: &envoy_endpoint_v3.LbEndpoint_Endpoint{
Endpoint: &envoy_endpoint_v3.Endpoint{
Address: makeAddress(addr, port),
},
},
})
}
if len(serverEndpoints) > 0 {
resources = append(resources, &envoy_endpoint_v3.ClusterLoadAssignment{
ClusterName: connect.PeeringServerSAN(cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain),
Endpoints: []*envoy_endpoint_v3.LocalityLbEndpoints{{
LbEndpoints: serverEndpoints,
}},
})
}
}
// Generate the endpoints for each service and its subsets
e, err := s.endpointsFromServicesAndResolvers(cfgSnap, cfgSnap.MeshGateway.ServiceGroups, cfgSnap.MeshGateway.ServiceResolvers)
if err != nil {
return nil, err
}
resources = append(resources, e...)
// Generate the endpoints for exported discovery chain targets.
e, err = s.makeExportedUpstreamEndpointsForMeshGateway(cfgSnap)
if err != nil {
return nil, err
}
resources = append(resources, e...)
// generate the outgoing endpoints for imported peer services.
e, err = s.makeEndpointsForOutgoingPeeredServices(cfgSnap)
if err != nil {
return nil, err
}
resources = append(resources, e...)
// Generate the endpoints for peer server control planes.
e, err = s.makePeerServerEndpointsForMeshGateway(cfgSnap)
if err != nil {
return nil, err
}
resources = append(resources, e...)
return resources, nil
}
func (s *ResourceGenerator) endpointsFromServicesAndResolvers(
cfgSnap *proxycfg.ConfigSnapshot,
services map[structs.ServiceName]structs.CheckServiceNodes,
resolvers map[structs.ServiceName]*structs.ServiceResolverConfigEntry,
) ([]proto.Message, error) {
resources := make([]proto.Message, 0, len(services))
// generate the endpoints for the linked service groups
for svc, endpoints := range services {
// Skip creating endpoints for services that have hostnames as addresses
// EDS cannot resolve hostnames so we provide them through CDS instead
if cfgSnap.Kind == structs.ServiceKindTerminatingGateway && len(cfgSnap.TerminatingGateway.HostnameServices[svc]) > 0 {
continue
}
clusterEndpoints := make(map[string][]loadAssignmentEndpointGroup)
clusterEndpoints[UnnamedSubset] = []loadAssignmentEndpointGroup{{Endpoints: endpoints, OnlyPassing: false}}
// Collect all of the loadAssignmentEndpointGroups for the various subsets. We do this before generating
// the endpoints for the default/unnamed subset so that we can take into account the DefaultSubset on the
// service-resolver which may prevent the default/unnamed cluster from creating endpoints for all service
// instances.
if resolver, hasResolver := resolvers[svc]; hasResolver {
for subsetName, subset := range resolver.Subsets {
subsetEndpoints, err := s.filterSubsetEndpoints(&subset, endpoints)
if err != nil {
return nil, err
}
groups := []loadAssignmentEndpointGroup{{Endpoints: subsetEndpoints, OnlyPassing: subset.OnlyPassing}}
clusterEndpoints[subsetName] = groups
// if this subset is the default then override the unnamed subset with this configuration
if subsetName == resolver.DefaultSubset {
clusterEndpoints[UnnamedSubset] = groups
}
}
}
// now generate the load assignment for all subsets
for subsetName, groups := range clusterEndpoints {
clusterName := connect.ServiceSNI(svc.Name, subsetName, svc.NamespaceOrDefault(), svc.PartitionOrDefault(), cfgSnap.Datacenter, cfgSnap.Roots.TrustDomain)
la := makeLoadAssignment(
clusterName,
groups,
cfgSnap.Locality,
)
resources = append(resources, la)
}
}
return resources, nil
}
func (s *ResourceGenerator) makeEndpointsForOutgoingPeeredServices(
cfgSnap *proxycfg.ConfigSnapshot,
) ([]proto.Message, error) {
var resources []proto.Message
// generate the endpoints for the linked service groups
for _, serviceGroups := range cfgSnap.MeshGateway.PeeringServices {
for sn, serviceGroup := range serviceGroups {
if serviceGroup.UseCDS || len(serviceGroup.Nodes) == 0 {
continue
}
node := serviceGroup.Nodes[0]
if node.Service == nil {
return nil, fmt.Errorf("couldn't get SNI for peered service %s", sn.String())
}
// This uses the SNI in the accepting cluster peer so the remote mesh
// gateway can distinguish between an exported service as opposed to the
// usual mesh gateway route for a service.
clusterName := node.Service.Connect.PeerMeta.PrimarySNI()
groups := []loadAssignmentEndpointGroup{{Endpoints: serviceGroup.Nodes, OnlyPassing: false}}
la := makeLoadAssignment(
clusterName,
groups,
// Use an empty key here so that it never matches. This will force the mesh gateway to always
// reference the remote mesh gateway's wan addr.
proxycfg.GatewayKey{},
)
resources = append(resources, la)
}
}
return resources, nil
}
func (s *ResourceGenerator) makePeerServerEndpointsForMeshGateway(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
resources := make([]proto.Message, 0, len(cfgSnap.MeshGateway.PeerServers))
// Peer server names are assumed to already be formatted in SNI notation:
// server.<datacenter>.peering.<trust-domain>
for name, servers := range cfgSnap.MeshGateway.PeerServers {
if servers.UseCDS || len(servers.Addresses) == 0 {
continue
}
es := make([]*envoy_endpoint_v3.LbEndpoint, 0, len(servers.Addresses))
for _, address := range servers.Addresses {
es = append(es, makeEndpoint(address.Address, address.Port))
}
cla := &envoy_endpoint_v3.ClusterLoadAssignment{
ClusterName: name,
Endpoints: []*envoy_endpoint_v3.LocalityLbEndpoints{
{
LbEndpoints: es,
},
},
}
resources = append(resources, cla)
}
return resources, nil
}
func (s *ResourceGenerator) endpointsFromSnapshotIngressGateway(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
var resources []proto.Message
createdClusters := make(map[proxycfg.UpstreamID]bool)
for _, upstreams := range cfgSnap.IngressGateway.Upstreams {
for _, u := range upstreams {
uid := proxycfg.NewUpstreamID(&u)
// If we've already created endpoints for this upstream, skip it. Multiple listeners may
// reference the same upstream, so we don't need to create duplicate endpoints in that case.
if createdClusters[uid] {
continue
}
es, err := s.endpointsFromDiscoveryChain(
uid,
cfgSnap.IngressGateway.DiscoveryChain[uid],
cfgSnap,
proxycfg.GatewayKey{Datacenter: cfgSnap.Datacenter, Partition: u.DestinationPartition},
u.Config,
cfgSnap.IngressGateway.WatchedUpstreamEndpoints[uid],
cfgSnap.IngressGateway.WatchedGatewayEndpoints[uid],
false,
)
if err != nil {
return nil, err
}
resources = append(resources, es...)
createdClusters[uid] = true
}
}
return resources, nil
}
// used in clusters.go
func makeEndpoint(host string, port int) *envoy_endpoint_v3.LbEndpoint {
return &envoy_endpoint_v3.LbEndpoint{
HostIdentifier: &envoy_endpoint_v3.LbEndpoint_Endpoint{
Endpoint: &envoy_endpoint_v3.Endpoint{
Address: makeAddress(host, port),
},
},
}
}
func makePipeEndpoint(path string) *envoy_endpoint_v3.LbEndpoint {
return &envoy_endpoint_v3.LbEndpoint{
HostIdentifier: &envoy_endpoint_v3.LbEndpoint_Endpoint{
Endpoint: &envoy_endpoint_v3.Endpoint{
Address: makePipeAddress(path, 0),
},
},
}
}
func (s *ResourceGenerator) makeUpstreamLoadAssignmentForPeerService(
cfgSnap *proxycfg.ConfigSnapshot,
clusterName string,
uid proxycfg.UpstreamID,
upstreamGatewayMode structs.MeshGatewayMode,
) (*envoy_endpoint_v3.ClusterLoadAssignment, error) {
var la *envoy_endpoint_v3.ClusterLoadAssignment
upstreamsSnapshot, err := cfgSnap.ToConfigSnapshotUpstreams()
if err != nil {
return la, err
}
if upstreamGatewayMode == structs.MeshGatewayModeNone {
s.Logger.Warn(fmt.Sprintf("invalid mesh gateway mode 'none', defaulting to 'remote' for %q", uid))
}
// If an upstream is configured with local mesh gw mode, we make a load assignment
// from the gateway endpoints instead of those of the upstreams.
if upstreamGatewayMode == structs.MeshGatewayModeLocal {
localGw, ok := cfgSnap.ConnectProxy.WatchedLocalGWEndpoints.Get(cfgSnap.Locality.String())
if !ok {
// local GW is not ready; return early
return la, nil
}
la = makeLoadAssignment(
clusterName,
[]loadAssignmentEndpointGroup{
{Endpoints: localGw},
},
cfgSnap.Locality,
)
return la, nil
}
// Also skip peer instances with a hostname as their address. EDS
// cannot resolve hostnames, so we provide them through CDS instead.
if _, ok := upstreamsSnapshot.PeerUpstreamEndpointsUseHostnames[uid]; ok {
return la, nil
}
endpoints, ok := upstreamsSnapshot.PeerUpstreamEndpoints.Get(uid)
if !ok {
return nil, nil
}
la = makeLoadAssignment(
clusterName,
[]loadAssignmentEndpointGroup{
{Endpoints: endpoints},
},
proxycfg.GatewayKey{ /*empty so it never matches*/ },
)
return la, nil
}
func (s *ResourceGenerator) endpointsFromDiscoveryChain(
uid proxycfg.UpstreamID,
chain *structs.CompiledDiscoveryChain,
cfgSnap *proxycfg.ConfigSnapshot,
gatewayKey proxycfg.GatewayKey,
upstreamConfigMap map[string]interface{},
upstreamEndpoints map[string]structs.CheckServiceNodes,
gatewayEndpoints map[string]structs.CheckServiceNodes,
forMeshGateway bool,
) ([]proto.Message, error) {
if chain == nil {
if forMeshGateway {
return nil, fmt.Errorf("missing discovery chain for %s", uid)
}
return nil, nil
}
if upstreamConfigMap == nil {
upstreamConfigMap = make(map[string]interface{}) // TODO:needed?
}
upstreamsSnapshot, err := cfgSnap.ToConfigSnapshotUpstreams()
// Mesh gateways are exempt because upstreamsSnapshot is only used for
// cluster peering targets and transative failover/redirects are unsupported.
if err != nil && !forMeshGateway {
return nil, err
}
var resources []proto.Message
var escapeHatchCluster *envoy_cluster_v3.Cluster
if !forMeshGateway {
cfg, err := structs.ParseUpstreamConfigNoDefaults(upstreamConfigMap)
if err != nil {
// Don't hard fail on a config typo, just warn. The parse func returns
// default config if there is an error so it's safe to continue.
s.Logger.Warn("failed to parse", "upstream", uid,
"error", err)
}
if cfg.EnvoyClusterJSON != "" {
if chain.Default {
// If you haven't done anything to setup the discovery chain, then
// you can use the envoy_cluster_json escape hatch.
escapeHatchCluster, err = makeClusterFromUserConfig(cfg.EnvoyClusterJSON)
if err != nil {
return resources, nil
}
} else {
s.Logger.Warn("ignoring escape hatch setting, because a discovery chain is configued for",
"discovery chain", chain.ServiceName, "upstream", uid,
"envoy_cluster_json", chain.ServiceName)
}
}
}
mgwMode := structs.MeshGatewayModeDefault
if upstream, _ := cfgSnap.ConnectProxy.GetUpstream(uid, &cfgSnap.ProxyID.EnterpriseMeta); upstream != nil {
mgwMode = upstream.MeshGateway.Mode
}
// Find all resolver nodes.
for _, node := range chain.Nodes {
if node.Type != structs.DiscoveryGraphNodeTypeResolver {
continue
}
primaryTargetID := node.Resolver.Target
failover := node.Resolver.Failover
var targetsClustersData []targetClusterData
var numFailoverTargets int
if failover != nil {
numFailoverTargets = len(failover.Targets)
}
if numFailoverTargets > 0 && !forMeshGateway {
for _, targetID := range append([]string{primaryTargetID}, failover.Targets...) {
targetData, ok := s.getTargetClusterData(upstreamsSnapshot, chain, targetID, forMeshGateway, true)
if !ok {
continue
}
if escapeHatchCluster != nil {
targetData.clusterName = escapeHatchCluster.Name
}
targetsClustersData = append(targetsClustersData, targetData)
}
} else {
if td, ok := s.getTargetClusterData(upstreamsSnapshot, chain, primaryTargetID, forMeshGateway, false); ok {
if escapeHatchCluster != nil {
td.clusterName = escapeHatchCluster.Name
}
targetsClustersData = append(targetsClustersData, td)
}
}
for _, targetOpt := range targetsClustersData {
s.Logger.Debug("generating endpoints for", "cluster", targetOpt.clusterName)
targetUID := proxycfg.NewUpstreamIDFromTargetID(targetOpt.targetID)
if targetUID.Peer != "" {
loadAssignment, err := s.makeUpstreamLoadAssignmentForPeerService(cfgSnap, targetOpt.clusterName, targetUID, mgwMode)
if err != nil {
return nil, err
}
if loadAssignment != nil {
resources = append(resources, loadAssignment)
}
continue
}
endpointGroup, valid := makeLoadAssignmentEndpointGroup(
chain.Targets,
upstreamEndpoints,
gatewayEndpoints,
targetOpt.targetID,
gatewayKey,
forMeshGateway,
)
if !valid {
continue // skip the cluster if we're still populating the snapshot
}
la := makeLoadAssignment(
targetOpt.clusterName,
[]loadAssignmentEndpointGroup{endpointGroup},
gatewayKey,
)
resources = append(resources, la)
}
}
return resources, nil
}
func (s *ResourceGenerator) makeExportedUpstreamEndpointsForMeshGateway(cfgSnap *proxycfg.ConfigSnapshot) ([]proto.Message, error) {
var resources []proto.Message
populatedExportedClusters := make(map[string]struct{}) // key=clusterName
for _, svc := range cfgSnap.MeshGatewayValidExportedServices() {
chain := cfgSnap.MeshGateway.DiscoveryChain[svc]
chainEndpoints := make(map[string]structs.CheckServiceNodes)
for _, target := range chain.Targets {
if !cfgSnap.Locality.Matches(target.Datacenter, target.Partition) {
s.Logger.Warn("ignoring discovery chain target that crosses a datacenter or partition boundary in a mesh gateway",
"target", target,
"gatewayLocality", cfgSnap.Locality,
)
continue
}
targetSvc := target.ServiceName()
endpoints, ok := cfgSnap.MeshGateway.ServiceGroups[targetSvc]
if !ok {
continue // ignore; not ready
}
if target.ServiceSubset == "" {
chainEndpoints[target.ID] = endpoints
} else {
resolver, ok := cfgSnap.MeshGateway.ServiceResolvers[targetSvc]
if !ok {
continue // ignore; not ready
}
subset, ok := resolver.Subsets[target.ServiceSubset]
if !ok {
continue // ignore; not ready
}
subsetEndpoints, err := s.filterSubsetEndpoints(&subset, endpoints)
if err != nil {
return nil, err
}
chainEndpoints[target.ID] = subsetEndpoints
}
}
clusterEndpoints, err := s.endpointsFromDiscoveryChain(
proxycfg.NewUpstreamIDFromServiceName(svc),
chain,
cfgSnap,
cfgSnap.Locality,
nil,
chainEndpoints,
nil,
true,
)
if err != nil {
return nil, err
}
for _, endpoints := range clusterEndpoints {
clusterName := xdscommon.GetResourceName(endpoints)
if _, ok := populatedExportedClusters[clusterName]; ok {
continue
}
populatedExportedClusters[clusterName] = struct{}{}
resources = append(resources, endpoints)
}
}
return resources, nil
}
type loadAssignmentEndpointGroup struct {
Endpoints structs.CheckServiceNodes
OnlyPassing bool
OverrideHealth envoy_core_v3.HealthStatus
}
func makeLoadAssignment(clusterName string, endpointGroups []loadAssignmentEndpointGroup, localKey proxycfg.GatewayKey) *envoy_endpoint_v3.ClusterLoadAssignment {
cla := &envoy_endpoint_v3.ClusterLoadAssignment{
ClusterName: clusterName,
Endpoints: make([]*envoy_endpoint_v3.LocalityLbEndpoints, 0, len(endpointGroups)),
}
if len(endpointGroups) > 1 {
cla.Policy = &envoy_endpoint_v3.ClusterLoadAssignment_Policy{
// We choose such a large value here that the failover math should
// in effect not happen until zero instances are healthy.
OverprovisioningFactor: makeUint32Value(100000),
}
}
for priority, endpointGroup := range endpointGroups {
endpoints := endpointGroup.Endpoints
es := make([]*envoy_endpoint_v3.LbEndpoint, 0, len(endpoints))
for _, ep := range endpoints {
// TODO (mesh-gateway) - should we respect the translate_wan_addrs configuration here or just always use the wan for cross-dc?
_, addr, port := ep.BestAddress(!localKey.Matches(ep.Node.Datacenter, ep.Node.PartitionOrDefault()))
healthStatus, weight := calculateEndpointHealthAndWeight(ep, endpointGroup.OnlyPassing)
if endpointGroup.OverrideHealth != envoy_core_v3.HealthStatus_UNKNOWN {
healthStatus = endpointGroup.OverrideHealth
}
endpoint := &envoy_endpoint_v3.Endpoint{
Address: makeAddress(addr, port),
}
es = append(es, &envoy_endpoint_v3.LbEndpoint{
HostIdentifier: &envoy_endpoint_v3.LbEndpoint_Endpoint{
Endpoint: endpoint,
},
HealthStatus: healthStatus,
LoadBalancingWeight: makeUint32Value(weight),
})
}
cla.Endpoints = append(cla.Endpoints, &envoy_endpoint_v3.LocalityLbEndpoints{
Priority: uint32(priority),
LbEndpoints: es,
})
}
return cla
}
func makeLoadAssignmentEndpointGroup(
targets map[string]*structs.DiscoveryTarget,
targetHealth map[string]structs.CheckServiceNodes,
gatewayHealth map[string]structs.CheckServiceNodes,
targetID string,
localKey proxycfg.GatewayKey,
forMeshGateway bool,
) (loadAssignmentEndpointGroup, bool) {
realEndpoints, ok := targetHealth[targetID]
if !ok {
// skip the cluster if we're still populating the snapshot
return loadAssignmentEndpointGroup{}, false
}
target := targets[targetID]
var gatewayKey proxycfg.GatewayKey
switch target.MeshGateway.Mode {
case structs.MeshGatewayModeRemote:
gatewayKey.Datacenter = target.Datacenter
gatewayKey.Partition = target.Partition
case structs.MeshGatewayModeLocal:
gatewayKey = localKey
}
if forMeshGateway || gatewayKey.IsEmpty() || localKey.Matches(target.Datacenter, target.Partition) {
// Gateways are not needed if the request isn't for a remote DC or partition.
return loadAssignmentEndpointGroup{
Endpoints: realEndpoints,
OnlyPassing: target.Subset.OnlyPassing,
}, true
}
// If using a mesh gateway we need to pull those endpoints instead.
gatewayEndpoints, ok := gatewayHealth[gatewayKey.String()]
if !ok {
// skip the cluster if we're still populating the snapshot
return loadAssignmentEndpointGroup{}, false
}
// But we will use the health from the actual backend service.
overallHealth := envoy_core_v3.HealthStatus_UNHEALTHY
for _, ep := range realEndpoints {
health, _ := calculateEndpointHealthAndWeight(ep, target.Subset.OnlyPassing)
if health == envoy_core_v3.HealthStatus_HEALTHY {
overallHealth = envoy_core_v3.HealthStatus_HEALTHY
break
}
}
return loadAssignmentEndpointGroup{
Endpoints: gatewayEndpoints,
OverrideHealth: overallHealth,
}, true
}
func calculateEndpointHealthAndWeight(
ep structs.CheckServiceNode,
onlyPassing bool,
) (envoy_core_v3.HealthStatus, int) {
healthStatus := envoy_core_v3.HealthStatus_HEALTHY
weight := 1
if ep.Service.Weights != nil {
weight = ep.Service.Weights.Passing
}
for _, chk := range ep.Checks {
if chk.Status == api.HealthCritical {
healthStatus = envoy_core_v3.HealthStatus_UNHEALTHY
}
if onlyPassing && chk.Status != api.HealthPassing {
healthStatus = envoy_core_v3.HealthStatus_UNHEALTHY
}
if chk.Status == api.HealthWarning && ep.Service.Weights != nil {
weight = ep.Service.Weights.Warning
}
}
// Make weights fit Envoy's limits. A zero weight means that either Warning
// (likely) or Passing (weirdly) weight has been set to 0 effectively making
// this instance unhealthy and should not be sent traffic.
if weight < 1 {
healthStatus = envoy_core_v3.HealthStatus_UNHEALTHY
weight = 1
}
if weight > 128 {
weight = 128
}
return healthStatus, weight
}