move GrpcUtil.getFlag to api

Author: jdcormie

api/src/main/java/io/grpc/InternalFeatureFlags.java

@@ -0,0 +1,39 @@
+/*
+ * Copyright 2026 The 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 io.grpc;
+
+import com.google.common.base.Strings;
+
+@Internal
+public class InternalFeatureFlags {
+  public static boolean getFlag(String envVarName, boolean enableByDefault) {
+    String envVar = System.getenv(envVarName);
+    if (envVar == null) {
+      envVar = System.getProperty(envVarName);
+    }
+    if (envVar != null) {
+      envVar = envVar.trim();
+    }
+    if (enableByDefault) {
+      return Strings.isNullOrEmpty(envVar) || Boolean.parseBoolean(envVar);
+    } else {
+      return !Strings.isNullOrEmpty(envVar) && Boolean.parseBoolean(envVar);
+    }
+  }
+
+  private InternalFeatureFlags() {}
+}

core/src/main/java/io/grpc/internal/GrpcUtil.java

@@ -24,14 +24,14 @@
 import com.google.common.base.Preconditions;
 import com.google.common.base.Splitter;
 import com.google.common.base.Stopwatch;
-import com.google.common.base.Strings;
 import com.google.common.base.Supplier;
 import com.google.common.util.concurrent.ListenableFuture;
 import com.google.common.util.concurrent.ThreadFactoryBuilder;
 import io.grpc.CallOptions;
 import io.grpc.ClientStreamTracer;
 import io.grpc.ClientStreamTracer.StreamInfo;
 import io.grpc.InternalChannelz.SocketStats;
+import io.grpc.InternalFeatureFlags;
 import io.grpc.InternalLogId;
 import io.grpc.InternalMetadata;
 import io.grpc.InternalMetadata.TrustedAsciiMarshaller;
@@ -958,18 +958,7 @@ public static String encodeAuthority(String authority) {
   }
 
   public static boolean getFlag(String envVarName, boolean enableByDefault) {
-    String envVar = System.getenv(envVarName);
-    if (envVar == null) {
-      envVar = System.getProperty(envVarName);
-    }
-    if (envVar != null) {
-      envVar = envVar.trim();
-    }
-    if (enableByDefault) {
-      return Strings.isNullOrEmpty(envVar) || Boolean.parseBoolean(envVar);
-    } else {
-      return !Strings.isNullOrEmpty(envVar) && Boolean.parseBoolean(envVar);
-    }
+    return InternalFeatureFlags.getFlag(envVarName, enableByDefault);
   }