snapshot of https://github.com/grpc/grpc-go.git (master, 2026-09-15; blobs > 131072B omitted)

balancer/rls/internal/test/e2e/rls_lb_config.go

@@ -0,0 +1,103 @@
+/*
+ *
+ * Copyright 2021 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package e2e
+
+import (
+	"errors"
+	"fmt"
+
+	"google.golang.org/grpc/balancer"
+	rlspb "google.golang.org/grpc/internal/proto/grpc_lookup_v1"
+	internalserviceconfig "google.golang.org/grpc/internal/serviceconfig"
+	"google.golang.org/grpc/serviceconfig"
+
+	"google.golang.org/protobuf/encoding/protojson"
+)
+
+// RLSConfig is a utility type to build service config for the RLS LB policy.
+type RLSConfig struct {
+	RouteLookupConfig                *rlspb.RouteLookupConfig
+	RouteLookupChannelServiceConfig  string
+	ChildPolicy                      *internalserviceconfig.BalancerConfig
+	ChildPolicyConfigTargetFieldName string
+}
+
+// ServiceConfigJSON generates service config with a load balancing config
+// corresponding to the RLS LB policy.
+func (c *RLSConfig) ServiceConfigJSON() (string, error) {
+	m := protojson.MarshalOptions{
+		Multiline:     true,
+		Indent:        "  ",
+		UseProtoNames: true,
+	}
+	routeLookupCfg, err := m.Marshal(c.RouteLookupConfig)
+	if err != nil {
+		return "", err
+	}
+	childPolicy, err := c.ChildPolicy.MarshalJSON()
+	if err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf(`
+{
+  "loadBalancingConfig": [
+    {
+      "rls_experimental": {
+        "routeLookupConfig": %s,
+				"routeLookupChannelServiceConfig": %s,
+        "childPolicy": %s,
+        "childPolicyConfigTargetFieldName": %q
+      }
+    }
+  ]
+}`, string(routeLookupCfg), c.RouteLookupChannelServiceConfig, string(childPolicy), c.ChildPolicyConfigTargetFieldName), nil
+}
+
+// LoadBalancingConfig generates load balancing config which can used as part of
+// a ClientConnState update to the RLS LB policy.
+func (c *RLSConfig) LoadBalancingConfig() (serviceconfig.LoadBalancingConfig, error) {
+	m := protojson.MarshalOptions{
+		Multiline:     true,
+		Indent:        "  ",
+		UseProtoNames: true,
+	}
+	routeLookupCfg, err := m.Marshal(c.RouteLookupConfig)
+	if err != nil {
+		return nil, err
+	}
+	childPolicy, err := c.ChildPolicy.MarshalJSON()
+	if err != nil {
+		return nil, err
+	}
+	lbConfigJSON := fmt.Sprintf(`
+{
+  "routeLookupConfig": %s,
+  "routeLookupChannelServiceConfig": %s,
+  "childPolicy": %s,
+  "childPolicyConfigTargetFieldName": %q
+}`, string(routeLookupCfg), c.RouteLookupChannelServiceConfig, string(childPolicy), c.ChildPolicyConfigTargetFieldName)
+
+	builder := balancer.Get("rls_experimental")
+	if builder == nil {
+		return nil, errors.New("balancer builder not found for RLS LB policy")
+	}
+	parser := builder.(balancer.ConfigParser)
+	return parser.ParseConfig([]byte(lbConfigJSON))
+}