remove xDS support

CHANGELOG.md

@@ -3,6 +3,11 @@
 Lists all changes with user impact.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
+## [0.20.0]
+
+### Changed
+- Remove xds support
+
 ## [0.19.31]
 
 ### Changed

docs/configuration.md

@@ -79,9 +79,7 @@ Property
 **envoy-control.envoy.snapshot.routes.status.endpoints**                                                     | List of endpoints with path or prefix of status routes                                                                                                                                                                | /status
 **envoy-control.envoy.snapshot.routes.status.create-virtual-cluster**                                        | Create virtual cluster for status route                                                                                                                                                                               | false
 **envoy-control.envoy.snapshot.state-sample-duration**                                                       | Duration of state sampling (this is used to prevent surges in consul events overloading control plane)                                                                                                                | 1s
-**envoy-control.envoy.snapshot.xds-cluster-name**                                                            | Name of cluster for xDS operations                                                                                                                                                                                    | envoy-control-xds
-**envoy-control.envoy.snapshot.enabled-communication-modes.ads**                                             | Enable or disable support for ADS communication mode                                                                                                                                                                  | true
-**envoy-control.envoy.snapshot.enabled-communication-modes.xds**                                             | Enable or disable support for XDS communication mode                                                                                                                                                                  | true
+**envoy-control.envoy.snapshot.xds-cluster-name**                                                            | Name of cluster for xDS operations                                                                                                                                                                                    | envoy-control-xds                                                                                                                                                              | true
 **envoy-control.envoy.snapshot.should-send-missing-endpoints**                                               | Enable sending missing Endpoints - when Envoy requests for not existing cluster in snapshot control-plane will respond with empty Endpoint definition                                                                 | false
 **envoy-control.envoy.snapshot.cluster-name**                                                                | Dynamic forward proxy cluster name                                                                                                                                                                                    | dynamic_forward_proxy_cluster
 **envoy-control.envoy.snapshot.dns-lookup-family**                                                           | DNS lookup address family                                                                                                                                                                                             | V4_ONLY

docs/features/permissions.md

@@ -16,7 +16,6 @@ An example configuration:
 
 ```yaml
 metadata:
-  ads: true
   proxy_settings:
     outgoing:
       dependencies:

docs/integrations/envoy.md

@@ -24,16 +24,6 @@ and the IP can be put in `x-envoy-original-dst-host` header (`x-envoy-original-d
 By default, Envoy will respond with `404` status code when it receives a request for a cluster that does not exist.
 The behavior is changed so that the `503` status code is returned.
 
-## ADS Support
-
-By default, the xDS is used instead of
-[Aggregated Discovery Service](https://www.envoyproxy.io/docs/envoy/latest/configuration/overview/xds_api#aggregated-discovery-service)
-(ADS). To use ADS for given node put the
-```
-ads: true
-```
-in Envoy metadata config. Envoy Control will pick it up and use ADS for this node.
-
 ## Outlier detection
 
 You can configure global

docs/performance.md

@@ -20,15 +20,6 @@ Additionally, the network usage is significantly higher. With 1,000 clusters, we
 Assuming that a new snapshot is generated every second. 1,000 Envoys with 1,000 clusters can generate a load of
 300 MB/s. When following only a few services, the snapshot is about 5 KB and it's sent much less frequently.
 
-### Use ADS
-
-With xDS, Envoy set up a gRPC stream to Envoy Control per cluster. Let's say there are 1,000 Envoys and 1,000 clusters.
-Envoy Control will have to handle 1,000,000 open gRPC streams. This puts pressure on memory, which converts to more
-frequent GC runs and higher CPU usage.
-
-With ADS, each Envoy sets up a single gRPC stream for all clusters. With 1,000 Envoys, there are 1,000 streams which
-reduces memory usage dramatically.
-
 ### Sampling
 
 Envoy Control by default follows changes from the discovery service, batches them and sends to Envoys at most once every second.

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/groups/Groups.kt

@@ -1,23 +1,20 @@
 package pl.allegro.tech.servicemesh.envoycontrol.groups
 
 sealed class Group {
-    abstract val communicationMode: CommunicationMode
     abstract val serviceName: String
     abstract val discoveryServiceName: String?
     abstract val proxySettings: ProxySettings
     abstract val listenersConfig: ListenersConfig?
 }
 
 data class ServicesGroup(
-    override val communicationMode: CommunicationMode,
     override val serviceName: String = "",
     override val discoveryServiceName: String? = null,
     override val proxySettings: ProxySettings = ProxySettings(),
     override val listenersConfig: ListenersConfig? = null
 ) : Group()
 
 data class AllServicesGroup(
-    override val communicationMode: CommunicationMode,
     override val serviceName: String = "",
     override val discoveryServiceName: String? = null,
     override val proxySettings: ProxySettings = ProxySettings(),

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/groups/MetadataNodeGroup.kt

@@ -138,15 +138,13 @@ class MetadataNodeGroup(
         return when {
             hasAllServicesDependencies(nodeMetadata) ->
                 AllServicesGroup(
-                    nodeMetadata.communicationMode,
                     serviceName,
                     discoveryServiceName,
                     proxySettings,
                     listenersConfig
                 )
             else ->
                 ServicesGroup(
-                    nodeMetadata.communicationMode,
                     serviceName,
                     discoveryServiceName,
                     proxySettings,

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/groups/NodeMetadata.kt

@@ -31,8 +31,6 @@ class NodeMetadata(metadata: Struct, properties: SnapshotProperties) {
         .fieldsMap["discovery_service_name"]
         ?.stringValue
 
-    val communicationMode = getCommunicationMode(metadata.fieldsMap["ads"])
-
     val proxySettings: ProxySettings = ProxySettings(metadata.fieldsMap["proxy_settings"], properties)
 }
 
@@ -68,17 +66,6 @@ data class ProxySettings(
     )
 }
 
-private fun getCommunicationMode(proto: Value?): CommunicationMode {
-    val ads = proto
-        ?.boolValue
-        ?: false
-
-    return when (ads) {
-        true -> CommunicationMode.ADS
-        else -> CommunicationMode.XDS
-    }
-}
-
 fun Value?.toComparisonFilter(default: String? = null): ComparisonFilterSettings? {
     return (this?.stringValue ?: default)?.let {
         AccessLogFilterParser.parseComparisonFilter(it.uppercase())
@@ -753,10 +740,6 @@ enum class PathMatchingType {
     PATH, PATH_PREFIX, PATH_REGEX
 }
 
-enum class CommunicationMode {
-    ADS, XDS
-}
-
 data class OAuth(
     val provider: String = "",
     val verification: Verification = Verification.OFFLINE,

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/groups/NodeMetadataValidator.kt

@@ -1,8 +1,6 @@
 package pl.allegro.tech.servicemesh.envoycontrol.groups
 
 import io.envoyproxy.controlplane.server.DiscoveryServerCallbacks
-import pl.allegro.tech.servicemesh.envoycontrol.groups.CommunicationMode.ADS
-import pl.allegro.tech.servicemesh.envoycontrol.groups.CommunicationMode.XDS
 import pl.allegro.tech.servicemesh.envoycontrol.logger
 import pl.allegro.tech.servicemesh.envoycontrol.protocol.HttpMethod
 import pl.allegro.tech.servicemesh.envoycontrol.snapshot.SnapshotProperties
@@ -84,7 +82,6 @@ class NodeMetadataValidator(
         validateDependencies(metadata)
         validateIncomingEndpoints(metadata)
         validateIncomingRateLimitEndpoints(metadata)
-        validateConfigurationMode(metadata)
     }
 
     private fun validateServiceName(metadata: NodeMetadata) {
@@ -170,13 +167,4 @@ class NodeMetadataValidator(
 
     private fun isAllowedToHaveAllServiceDependencies(metadata: NodeMetadata) = properties
         .outgoingPermissions.servicesAllowedToUseWildcard.contains(metadata.serviceName)
-
-    private fun validateConfigurationMode(metadata: NodeMetadata) {
-        if (metadata.communicationMode == ADS && !properties.enabledCommunicationModes.ads) {
-            throw ConfigurationModeNotSupportedException(metadata.serviceName, "ADS")
-        }
-        if (metadata.communicationMode == XDS && !properties.enabledCommunicationModes.xds) {
-            throw ConfigurationModeNotSupportedException(metadata.serviceName, "XDS")
-        }
-    }
 }

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/server/callbacks/MetricsDiscoveryServerCallbacks.kt

@@ -36,7 +36,7 @@ class MetricsDiscoveryServerCallbacks(private val meterRegistry: MeterRegistry)
 
         meterRegistry.gauge("grpc.all-connections", connections)
         connectionsByType.forEach { (type, typeConnections) ->
-            meterRegistry.gauge("grpc.connections.${type.name.toLowerCase()}", typeConnections)
+            meterRegistry.gauge("grpc.connections.${type.name.lowercase()}", typeConnections)
         }
     }
 
@@ -51,15 +51,15 @@ class MetricsDiscoveryServerCallbacks(private val meterRegistry: MeterRegistry)
     }
 
     override fun onV3StreamRequest(streamId: Long, request: V3DiscoveryRequest) {
-        meterRegistry.counter("grpc.requests.${StreamType.fromTypeUrl(request.typeUrl).name.toLowerCase()}")
+        meterRegistry.counter("grpc.requests.${StreamType.fromTypeUrl(request.typeUrl).name.lowercase()}")
             .increment()
     }
 
     override fun onV3StreamDeltaRequest(
         streamId: Long,
         request: V3DeltaDiscoveryRequest
     ) {
-        meterRegistry.counter("grpc.requests.${StreamType.fromTypeUrl(request.typeUrl).name.toLowerCase()}.delta")
+        meterRegistry.counter("grpc.requests.${StreamType.fromTypeUrl(request.typeUrl).name.lowercase()}.delta")
             .increment()
     }
 

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/snapshot/EnvoySnapshotFactory.kt

@@ -9,7 +9,6 @@ import io.envoyproxy.envoy.extensions.transport_sockets.tls.v3.Secret
 import io.micrometer.core.instrument.MeterRegistry
 import io.micrometer.core.instrument.Timer
 import pl.allegro.tech.servicemesh.envoycontrol.groups.AllServicesGroup
-import pl.allegro.tech.servicemesh.envoycontrol.groups.CommunicationMode
 import pl.allegro.tech.servicemesh.envoycontrol.groups.DependencySettings
 import pl.allegro.tech.servicemesh.envoycontrol.groups.Group
 import pl.allegro.tech.servicemesh.envoycontrol.groups.IncomingRateLimitEndpoint
@@ -41,14 +40,12 @@ class EnvoySnapshotFactory(
 
     fun newSnapshot(
         servicesStates: MultiClusterState,
-        clusterConfigurations: Map<String, ClusterConfiguration>,
-        communicationMode: CommunicationMode
+        clusterConfigurations: Map<String, ClusterConfiguration>
     ): GlobalSnapshot {
         val sample = Timer.start(meterRegistry)
 
         val clusters = clustersFactory.getClustersForServices(
-            clusterConfigurations.values,
-            communicationMode
+            clusterConfigurations.values
         )
         val securedClusters = clustersFactory.getSecuredClusters(clusters)
 
@@ -328,7 +325,7 @@ class EnvoySnapshotFactory(
                 routes.add(
                     egressRoutesFactory.createEgressDomainRoutes(
                         it.value,
-                        it.key.port.toString().toLowerCase()
+                        it.key.port.toString().lowercase()
                     )
                 )
             }

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/snapshot/SnapshotProperties.kt

@@ -26,7 +26,6 @@ class SnapshotProperties {
     var staticClusterConnectionTimeout: Duration = Duration.ofSeconds(2)
     var trustedCaFile = "/etc/ssl/certs/ca-certificates.crt"
     var dynamicListeners = ListenersFactoryProperties()
-    var enabledCommunicationModes = EnabledCommunicationModes()
     var shouldSendMissingEndpoints = false
     var metrics: MetricsProperties = MetricsProperties()
     var dynamicForwardProxy = DynamicForwardProxyProperties()
@@ -306,11 +305,6 @@ class Http2Properties {
     var tagName = "envoy"
 }
 
-class EnabledCommunicationModes {
-    var ads = true
-    var xds = true
-}
-
 class HostHeaderRewritingProperties {
     var enabled = false
     var customHostHeader = "x-envoy-original-host"

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/snapshot/SnapshotUpdater.kt

@@ -4,8 +4,6 @@ import io.envoyproxy.controlplane.cache.SnapshotCache
 import io.envoyproxy.controlplane.cache.v3.Snapshot
 import io.micrometer.core.instrument.MeterRegistry
 import io.micrometer.core.instrument.Timer
-import pl.allegro.tech.servicemesh.envoycontrol.groups.CommunicationMode.ADS
-import pl.allegro.tech.servicemesh.envoycontrol.groups.CommunicationMode.XDS
 import pl.allegro.tech.servicemesh.envoycontrol.groups.Group
 import pl.allegro.tech.servicemesh.envoycontrol.logger
 import pl.allegro.tech.servicemesh.envoycontrol.services.MultiClusterState
@@ -59,8 +57,7 @@ class SnapshotUpdater(
                 UpdateResult(
                     action = newUpdate.action,
                     groups = newUpdate.groups,
-                    adsSnapshot = newUpdate.adsSnapshot ?: previous.adsSnapshot,
-                    xdsSnapshot = newUpdate.xdsSnapshot ?: previous.xdsSnapshot
+                    snapshot = newUpdate.snapshot ?: previous.snapshot
                 )
             }
             // concat map guarantees sequential processing (unlike flatMap)
@@ -74,7 +71,7 @@ class SnapshotUpdater(
                 // step 4: update the snapshot for either all groups (if services changed)
                 //         or specific groups (groups changed).
                 // TODO(dj): on what occasion can this be false?
-                if (result.adsSnapshot != null || result.xdsSnapshot != null) {
+                if (result.snapshot != null) {
                     // Stateful operation! This is the meat of this processing.
                     updateSnapshotForGroups(groups, result)
                 } else {
@@ -111,19 +108,9 @@ class SnapshotUpdater(
             .name("snapshot-updater-services-published").metrics()
             .createClusterConfigurations()
             .map { (states, clusters) ->
-                var lastXdsSnapshot: GlobalSnapshot? = null
-                var lastAdsSnapshot: GlobalSnapshot? = null
-
-                if (properties.enabledCommunicationModes.xds) {
-                    lastXdsSnapshot = snapshotFactory.newSnapshot(states, clusters, XDS)
-                }
-                if (properties.enabledCommunicationModes.ads) {
-                    lastAdsSnapshot = snapshotFactory.newSnapshot(states, clusters, ADS)
-                }
                 val updateResult = UpdateResult(
                     action = Action.ALL_SERVICES_GROUP_ADDED,
-                    adsSnapshot = lastAdsSnapshot,
-                    xdsSnapshot = lastXdsSnapshot
+                    snapshot = snapshotFactory.newSnapshot(states, clusters),
                 )
                 globalSnapshot = updateResult
                 updateResult
@@ -169,13 +156,11 @@ class SnapshotUpdater(
         versions.retainGroups(cache.groups())
         val results = Flux.fromIterable(groups)
             .doOnNextScheduledOn(groupSnapshotScheduler) { group ->
-                if (result.adsSnapshot != null && group.communicationMode == ADS) {
-                    updateSnapshotForGroup(group, result.adsSnapshot)
-                } else if (result.xdsSnapshot != null && group.communicationMode == XDS) {
-                    updateSnapshotForGroup(group, result.xdsSnapshot)
+                if (result.snapshot != null) {
+                    updateSnapshotForGroup(group, result.snapshot)
                 } else {
                     meterRegistry.counter("snapshot-updater.communication-mode.errors").increment()
-                    logger.error("Requested snapshot for ${group.communicationMode.name} mode, but it is not here. " +
+                    logger.error("Requested snapshot, but it is not here. " +
                         "Handling Envoy with not supported communication mode should have been rejected before." +
                         " Please report this to EC developers.")
                 }
@@ -212,6 +197,5 @@ enum class Action {
 data class UpdateResult(
     val action: Action,
     val groups: List<Group> = listOf(),
-    val adsSnapshot: GlobalSnapshot? = null,
-    val xdsSnapshot: GlobalSnapshot? = null
+    val snapshot: GlobalSnapshot? = null
 )