On-demand VHDS implementation (#8617)

Implements on-demand resolution of VirtualHosts via VHDS

Signed-off-by: Dmitri Dolguikh <ddolguik@redhat.com>

Mirrored from https://github.com/envoyproxy/envoy @ 8e2d909ad22f84d9eb055f06890924a5879bad76

BUILD

@@ -51,6 +51,7 @@ proto_library(
         "//envoy/config/filter/http/ip_tagging/v2:pkg",
         "//envoy/config/filter/http/jwt_authn/v2alpha:pkg",
         "//envoy/config/filter/http/lua/v2:pkg",
+        "//envoy/config/filter/http/on_demand/v2:pkg",
         "//envoy/config/filter/http/original_src/v2alpha1:pkg",
         "//envoy/config/filter/http/rate_limit/v2:pkg",
         "//envoy/config/filter/http/rbac/v2:pkg",
@@ -143,6 +144,7 @@ proto_library(
         "//envoy/extensions/filters/http/ip_tagging/v3alpha:pkg",
         "//envoy/extensions/filters/http/jwt_authn/v3alpha:pkg",
         "//envoy/extensions/filters/http/lua/v3alpha:pkg",
+        "//envoy/extensions/filters/http/on_demand/v3alpha:pkg",
         "//envoy/extensions/filters/http/original_src/v3alpha:pkg",
         "//envoy/extensions/filters/http/ratelimit/v3alpha:pkg",
         "//envoy/extensions/filters/http/rbac/v3alpha:pkg",

docs/BUILD

@@ -51,6 +51,7 @@ proto_library(
         "//envoy/config/filter/http/ip_tagging/v2:pkg",
         "//envoy/config/filter/http/jwt_authn/v2alpha:pkg",
         "//envoy/config/filter/http/lua/v2:pkg",
+        "//envoy/config/filter/http/on_demand/v2:pkg",
         "//envoy/config/filter/http/original_src/v2alpha1:pkg",
         "//envoy/config/filter/http/rate_limit/v2:pkg",
         "//envoy/config/filter/http/rbac/v2:pkg",

envoy/config/filter/http/on_demand/v2/BUILD

@@ -0,0 +1,9 @@
+# DO NOT EDIT. This file is generated by tools/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = ["@com_github_cncf_udpa//udpa/annotations:pkg"],
+)

envoy/config/filter/http/on_demand/v2/on_demand.proto

@@ -0,0 +1,19 @@
+syntax = "proto3";
+
+package envoy.config.filter.http.on_demand.v2;
+
+import "udpa/annotations/migrate.proto";
+import "validate/validate.proto";
+
+option java_package = "io.envoyproxy.envoy.config.filter.http.on_demand.v2";
+option java_outer_classname = "OnDemandProto";
+option java_multiple_files = true;
+option (udpa.annotations.file_migrate).move_to_package =
+    "envoy.extensions.filters.http.on_demand.v3alpha";
+
+// [#protodoc-title: OnDemand]
+// IP tagging :ref:`configuration overview <config_http_filters_on_demand>`.
+// [#extension: envoy.filters.http.on_demand]
+
+message OnDemand {
+}

envoy/extensions/filters/http/on_demand/v3alpha/BUILD

@@ -0,0 +1,12 @@
+# DO NOT EDIT. This file is generated by tools/proto_sync.py.
+
+load("@envoy_api//bazel:api_build_system.bzl", "api_proto_package")
+
+licenses(["notice"])  # Apache 2
+
+api_proto_package(
+    deps = [
+        "//envoy/config/filter/http/on_demand/v2:pkg",
+        "@com_github_cncf_udpa//udpa/annotations:pkg",
+    ],
+)

envoy/extensions/filters/http/on_demand/v3alpha/on_demand.proto

@@ -0,0 +1,20 @@
+syntax = "proto3";
+
+package envoy.extensions.filters.http.on_demand.v3alpha;
+
+import "udpa/annotations/versioning.proto";
+
+import "validate/validate.proto";
+
+option java_package = "io.envoyproxy.envoy.extensions.filters.http.on_demand.v3alpha";
+option java_outer_classname = "OnDemandProto";
+option java_multiple_files = true;
+
+// [#protodoc-title: OnDemand]
+// IP tagging :ref:`configuration overview <config_http_filters_on_demand>`.
+// [#extension: envoy.filters.http.on_demand]
+
+message OnDemand {
+  option (udpa.annotations.versioning).previous_message_type =
+      "envoy.config.filter.http.on_demand.v2.OnDemand";
+}