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

internal/testutils/resolver.go

@@ -0,0 +1,70 @@
+/*
+ *
+ * Copyright 2023 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 testutils
+
+import (
+	"google.golang.org/grpc/internal"
+	"google.golang.org/grpc/internal/pretty"
+	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/serviceconfig"
+)
+
+// Logger wraps the logging methods from testing.T.
+type Logger interface {
+	Log(args ...any)
+	Logf(format string, args ...any)
+	Errorf(format string, args ...any)
+}
+
+// ResolverClientConn is a fake implementation of the resolver.ClientConn
+// interface to be used in tests.
+type ResolverClientConn struct {
+	resolver.ClientConn // Embedding the interface to avoid implementing deprecated methods.
+
+	Logger       Logger                     // Tests should pass testing.T for this.
+	UpdateStateF func(resolver.State) error // Invoked when resolver pushes a state update.
+	ReportErrorF func(err error)            // Invoked when resolver pushes an error.
+}
+
+// UpdateState invokes the test specified callback with the update received from
+// the resolver. If the callback returns a non-nil error, the same will be
+// propagated to the resolver.
+func (t *ResolverClientConn) UpdateState(s resolver.State) error {
+	t.Logger.Logf("testutils.ResolverClientConn: UpdateState(%s)", pretty.ToJSON(s))
+
+	if t.UpdateStateF != nil {
+		return t.UpdateStateF(s)
+	}
+	return nil
+}
+
+// ReportError pushes the error received from the resolver on to ErrorCh.
+func (t *ResolverClientConn) ReportError(err error) {
+	t.Logger.Logf("testutils.ResolverClientConn: ReportError(%v)", err)
+
+	if t.ReportErrorF != nil {
+		t.ReportErrorF(err)
+	}
+}
+
+// ParseServiceConfig parses the provided service by delegating the work to the
+// implementation in the grpc package.
+func (t *ResolverClientConn) ParseServiceConfig(jsonSC string) *serviceconfig.ParseResult {
+	return internal.ParseServiceConfig.(func(string) *serviceconfig.ParseResult)(jsonSC)
+}