delta xds property

Author: Ferdudas97

docs/configuration.md

@@ -82,6 +82,7 @@ Property
 **envoy-control.envoy.snapshot.max-host-ttl**                                                                | The TTL for hosts that are unused. Hosts that have not been used in the configured time interval will be purged                                                                                                       | 300s
 **envoy-control.envoy.snapshot.rate-limit.domain**                                                           | Domain name for ratelimit service.                                                                                                                                                                                    | rl
 **envoy-control.envoy.snapshot.rate-limit.service-name**                                                     | ratelimit GRPC service name                                                                                                                                                                                           | ratelimit-grpc
+**envoy-control.envoy.snapshot.delta-xds-enabled**                                                        | Enable detla xds                                                                                                                                                                                                      | false
 
 
 ## Permissions

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

@@ -32,6 +32,7 @@ class SnapshotProperties {
     var jwt = JwtFilterProperties()
     var requireServiceName = false
     var rateLimit = RateLimitProperties()
+    var deltaXdsEnabled = false
 }
 
 class MetricsProperties {

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

@@ -370,7 +370,7 @@ class EnvoyClustersFactory(
                                 .setResourceApiVersion(ApiVersion.V3)
                                 .setApiConfigSource(
                                     ApiConfigSource.newBuilder()
-                                        .setApiType(ApiConfigSource.ApiType.GRPC)
+                                        .setApiType(if (properties.deltaXdsEnabled) ApiConfigSource.ApiType.DELTA_GRPC else ApiConfigSource.ApiType.GRPC)
                                         .setTransportApiVersion(ApiVersion.V3)
                                         .addGrpcServices(
                                             0, GrpcService.newBuilder().setEnvoyGrpc(

envoy-control-core/src/main/kotlin/pl/allegro/tech/servicemesh/envoycontrol/snapshot/resource/listeners/filters/HttpConnectionManagerFactory.kt

@@ -136,7 +136,7 @@ class HttpConnectionManagerFactory(
 
     private fun apiConfigSource(): ApiConfigSource {
         return ApiConfigSource.newBuilder()
-            .setApiType(ApiConfigSource.ApiType.GRPC)
+            .setApiType(if (snapshotProperties.deltaXdsEnabled) ApiConfigSource.ApiType.DELTA_GRPC else ApiConfigSource.ApiType.GRPC)
             .setTransportApiVersion(ApiVersion.V3)
             .addGrpcServices(
                 GrpcService.newBuilder()