Add stable CEL support: dev.cel.expr

Author: sergiitk

bazel/external_proto_deps.bzl

@@ -29,12 +29,16 @@ EXTERNAL_PROTO_GO_BAZEL_DEP_MAP = {
     #    go_googleapis in https://github.com/bazelbuild/rules_go/blob/master/go/dependencies.rst#overriding-dependencies
     "@com_google_googleapis//google/api/expr/v1alpha1:checked_proto": "@go_googleapis//google/api/expr/v1alpha1:expr_go_proto",
     "@com_google_googleapis//google/api/expr/v1alpha1:syntax_proto": "@go_googleapis//google/api/expr/v1alpha1:expr_go_proto",
+    "@dev_cel//proto/cel/expr:checked_proto": "@dev_cel//proto/cel/expr:checked_go_proto",
+    "@dev_cel//proto/cel/expr:syntax_proto": "@dev_cel//proto/cel/expr:syntax_go_proto",
 }
 
 # This maps from the Bazel proto_library target to the C++ language binding target for external dependencies.
 EXTERNAL_PROTO_CC_BAZEL_DEP_MAP = {
     "@com_google_googleapis//google/api/expr/v1alpha1:checked_proto": "@com_google_googleapis//google/api/expr/v1alpha1:checked_cc_proto",
     "@com_google_googleapis//google/api/expr/v1alpha1:syntax_proto": "@com_google_googleapis//google/api/expr/v1alpha1:syntax_cc_proto",
+    "@dev_cel//proto/cel/expr:checked_proto": "@dev_cel//proto/cel/expr:checked_cc_proto",
+    "@dev_cel//proto/cel/expr:syntax_proto": "@dev_cel//proto/cel/expr:syntax_cc_proto",
 }
 
 # This maps from the Bazel proto_library target to the Python language binding target for external dependencies.

bazel/repositories.bzl

@@ -22,6 +22,10 @@ def xds_api_dependencies():
         "com_google_protobuf",
         locations = REPOSITORY_LOCATIONS,
     )
+    xds_http_archive(
+        name = "dev_cel",
+        locations = REPOSITORY_LOCATIONS,
+    )
     xds_http_archive(
         "io_bazel_rules_go",
         locations = REPOSITORY_LOCATIONS,

bazel/repository_locations.bzl

@@ -28,6 +28,11 @@ REPOSITORY_LOCATIONS = dict(
         strip_prefix = "protobuf-3.18.0",
         urls = ["https://github.com/protocolbuffers/protobuf/releases/download/v3.18.0/protobuf-all-3.18.0.tar.gz"],
     ),
+    dev_cel = dict(
+        sha256 = "6d4bf5a0ac04b35c421cb8317cd35bbe78aacffee787bc7aa89daa1e211ff6be",
+        strip_prefix = "cel-spec-0.13.0",
+        urls = ["https://github.com/google/cel-spec/archive/refs/tags/v0.13.0.tar.gz"],
+    ),
     io_bazel_rules_go = dict(
         sha256 = "69de5c704a05ff37862f7e0f5534d4f479418afc21806c887db544a316f3cb6b",
         urls = ["https://github.com/bazelbuild/rules_go/releases/download/v0.27.0/rules_go-v0.27.0.tar.gz"],

xds/type/v3/BUILD

@@ -7,5 +7,7 @@ xds_proto_package(
         "//xds/annotations/v3:pkg",
         "@com_google_googleapis//google/api/expr/v1alpha1:checked_proto",
         "@com_google_googleapis//google/api/expr/v1alpha1:syntax_proto",
+        "@dev_cel//proto/cel/expr:checked_proto",
+        "@dev_cel//proto/cel/expr:syntax_proto",
     ],
 )

xds/type/v3/cel.proto

@@ -4,6 +4,8 @@ package xds.type.v3;
 
 import "google/api/expr/v1alpha1/checked.proto";
 import "google/api/expr/v1alpha1/syntax.proto";
+import "cel/expr/checked.proto";
+import "cel/expr/syntax.proto";
 import "google/protobuf/wrappers.proto";
 
 import "xds/annotations/v3/status.proto";
@@ -30,6 +32,12 @@ message CelExpression {
 
     // Parsed expression in abstract syntax tree (AST) form that has been successfully type checked.
     google.api.expr.v1alpha1.CheckedExpr checked_expr = 2;
+
+    // Parsed expression in abstract syntax tree (AST) form.
+    cel.expr.ParsedExpr cel_expr_parsed = 3;
+
+    // Parsed expression in abstract syntax tree (AST) form that has been successfully type checked.
+    cel.expr.CheckedExpr cel_expr_checked = 4;
   }
 }