feat(gax): add protobuf version tracking to headers

gax-java/gax-httpjson/src/main/java/com/google/api/gax/httpjson/GaxHttpJsonProperties.java

@@ -36,7 +36,7 @@
 @InternalApi
 public class GaxHttpJsonProperties {
   private static final Pattern DEFAULT_API_CLIENT_HEADER_PATTERN =
-      Pattern.compile("gl-java/.+ gapic/.* gax/.+ rest/.*");
+      Pattern.compile("gl-java/.+ gapic/.*?--protobuf-.+ gax/.+ rest/.*");
 
   /** Returns default api client header pattern (to facilitate testing) */
   public static Pattern getDefaultApiClientHeaderPattern() {

gax-java/gax-httpjson/src/test/java/com/google/api/gax/httpjson/GaxHttpJsonPropertiesTest.java

@@ -41,7 +41,7 @@ class GaxHttpJsonPropertiesTest {
   void testDefaultHeaderPattern() {
     assertTrue(
         GaxHttpJsonProperties.getDefaultApiClientHeaderPattern()
-            .matcher("gl-java/1.8_00 gapic/1.2.3-alpha gax/1.5.0 rest/1.7.0")
+            .matcher("gl-java/1.8_00 gapic/1.2.3-alpha--protobuf-1.5.0 gax/1.5.0 rest/1.7.0")
             .matches());
   }
 }

gax-java/gax/src/main/java/com/google/api/gax/core/GaxProperties.java

@@ -32,9 +32,15 @@
 import com.google.api.core.InternalApi;
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Strings;
+import com.google.protobuf.Any;
+import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
+import java.net.URISyntaxException;
+import java.util.Optional;
 import java.util.Properties;
+import java.util.jar.Attributes;
+import java.util.jar.JarFile;
 
 /** Provides properties of the GAX library. */
 @InternalApi
@@ -43,6 +49,8 @@ public class GaxProperties {
   private static final String DEFAULT_VERSION = "";
   private static final String GAX_VERSION = getLibraryVersion(GaxProperties.class, "version.gax");
   private static final String JAVA_VERSION = getRuntimeVersion();
+  private static final String PROTOBUF_VERSION =
+      getBundleVersion(Any.class).orElse(DEFAULT_VERSION);
 
   private GaxProperties() {}
 
@@ -91,6 +99,11 @@ public static String getGaxVersion() {
     return GAX_VERSION;
   }
 
+  /** Returns the current version of protobuf runtime library. */
+  public static String getProtobufVersion() {
+    return PROTOBUF_VERSION;
+  }
+
   /**
    * Returns the current runtime version. For GraalVM the values in this method will be fetched at
    * build time and the values should not differ from the runtime (executable)
@@ -113,4 +126,27 @@ static String getRuntimeVersion() {
     // with hyphens.
     return javaRuntimeInformation.replaceAll("[^0-9a-zA-Z_\\\\.]", "-");
   }
+
+  /**
+   * Returns the current library version as reported by Bundle-Version attribute in library's
+   * META-INF/MANIFEST for libraries using OSGi bundle manifest specification
+   * https://www.ibm.com/docs/en/wasdtfe?topic=overview-osgi-bundles. This should only be used if
+   * MANIFEST file does not contain a widely recognized version declaration such as Specific-Version
+   * OR Implementation-Version declared in Manifest Specification
+   * https://docs.oracle.com/javase/8/docs/technotes/guides/jar/jar.html#Manifest_Specification,
+   * otherwise please use #getLibraryVersion
+   */
+  @VisibleForTesting
+  static Optional<String> getBundleVersion(Class<?> clazz) {
+    try {
+      File file = new File(clazz.getProtectionDomain().getCodeSource().getLocation().toURI());
+      try (JarFile jar = new JarFile(file.getPath())) {
+        Attributes attributes = jar.getManifest().getMainAttributes();
+        return Optional.ofNullable(attributes.getValue("Bundle-Version"));
+      }
+    } catch (URISyntaxException | IOException e) {
+      // Unable to read Bundle-Version from manifest. Recover gracefully.
+      return Optional.empty();
+    }
+  }
 }

gax-java/gax/src/main/java/com/google/api/gax/rpc/ApiClientHeaderProvider.java

@@ -33,6 +33,8 @@
 import com.google.common.collect.ImmutableMap;
 import java.io.Serializable;
 import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 /**
  * Implementation of HeaderProvider that provides headers describing the API client library making
@@ -41,6 +43,7 @@
 public class ApiClientHeaderProvider implements HeaderProvider, Serializable {
   private static final long serialVersionUID = -8876627296793342119L;
   static final String QUOTA_PROJECT_ID_HEADER_KEY = "x-goog-user-project";
+  static final String PROTOBUF_HEADER_VERSION_KEY = "protobuf";
 
   public static final String API_VERSION_HEADER_KEY = "x-goog-api-version";
 
@@ -57,8 +60,12 @@ protected ApiClientHeaderProvider(Builder builder) {
       appendToken(apiClientHeaderValue, builder.getGeneratedLibToken());
       appendToken(apiClientHeaderValue, builder.getGeneratedRuntimeToken());
       appendToken(apiClientHeaderValue, builder.getTransportToken());
+      appendToken(apiClientHeaderValue, builder.protobufRuntimeToken);
+
       if (apiClientHeaderValue.length() > 0) {
-        headersBuilder.put(builder.getApiClientHeaderKey(), apiClientHeaderValue.toString());
+        headersBuilder.put(
+            builder.getApiClientHeaderKey(),
+            checkAndAppendProtobufVersionIfNecessary(apiClientHeaderValue));
       }
     }
 
@@ -76,6 +83,22 @@ protected ApiClientHeaderProvider(Builder builder) {
     this.headers = headersBuilder.build();
   }
 
+  private static String checkAndAppendProtobufVersionIfNecessary(
+      StringBuilder apiClientHeaderValue) {
+    // TODO(b/366417603): appending protobuf version to existing client library token until resolved
+    Pattern pattern = Pattern.compile("(gccl|gapic)\\S*");
+    Matcher matcher = pattern.matcher(apiClientHeaderValue);
+    if (matcher.find()) {
+      return apiClientHeaderValue.substring(0, matcher.end())
+          + "--"
+          + PROTOBUF_HEADER_VERSION_KEY
+          + "-"
+          + GaxProperties.getProtobufVersion()
+          + apiClientHeaderValue.substring(matcher.end());
+    }
+    return apiClientHeaderValue.toString();
+  }
+
   @Override
   public Map<String, String> getHeaders() {
     return headers;
@@ -110,6 +133,7 @@ public static class Builder {
     private String generatedRuntimeToken;
     private String transportToken;
     private String quotaProjectIdToken;
+    private final String protobufRuntimeToken;
 
     private String resourceHeaderKey;
     private String resourceToken;
@@ -125,11 +149,11 @@ protected Builder() {
       setClientRuntimeToken(GaxProperties.getGaxVersion());
       transportToken = null;
       quotaProjectIdToken = null;
-
       resourceHeaderKey = getDefaultResourceHeaderKey();
       resourceToken = null;
-
       apiVersionToken = null;
+      protobufRuntimeToken =
+          constructToken(PROTOBUF_HEADER_VERSION_KEY, GaxProperties.getProtobufVersion());
     }
 
     public String getApiClientHeaderKey() {

gax-java/gax/src/test/java/com/google/api/gax/core/GaxPropertiesTest.java

@@ -29,10 +29,14 @@
  */
 package com.google.api.gax.core;
 
+import static com.google.api.gax.core.GaxProperties.getBundleVersion;
 import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.google.common.base.Strings;
+import java.io.IOException;
+import java.util.Optional;
 import java.util.regex.Pattern;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.Test;
@@ -41,17 +45,11 @@ class GaxPropertiesTest {
 
   @Test
   void testGaxVersion() {
-    String gaxVersion = GaxProperties.getGaxVersion();
-    assertTrue(Pattern.compile("^\\d+\\.\\d+\\.\\d+").matcher(gaxVersion).find());
-    String[] versionComponents = gaxVersion.split("\\.");
-    // This test was added in version 1.56.0, so check that the major and minor numbers are greater
-    // than that.
-    int major = Integer.parseInt(versionComponents[0]);
-    int minor = Integer.parseInt(versionComponents[1]);
+    Version version = readVersion(GaxProperties.getGaxVersion());
 
-    assertTrue(major >= 1);
-    if (major == 1) {
-      assertTrue(minor >= 56);
+    assertTrue(version.major >= 1);
+    if (version.major == 1) {
+      assertTrue(version.minor >= 56);
     }
   }
 
@@ -159,4 +157,41 @@ void testGetJavaRuntimeInfo_nullJavaVersion() {
     String runtimeInfo = GaxProperties.getRuntimeVersion();
     assertEquals("null__oracle__20.0.1", runtimeInfo);
   }
+
+  @Test
+  public void testGetProtobufVersion() throws IOException {
+    Version version = readVersion(GaxProperties.getProtobufVersion());
+
+    assertTrue(version.major >= 3);
+    if (version.major == 3) {
+      assertTrue(version.minor >= 25);
+    }
+  }
+
+  @Test
+  public void testGetBundleVersion_noManifestFile() throws IOException {
+    Optional<String> version = getBundleVersion(GaxProperties.class);
+
+    assertFalse(version.isPresent());
+  }
+
+  private Version readVersion(String version) {
+    assertTrue(Pattern.compile("^\\d+\\.\\d+\\.\\d+").matcher(version).find());
+    String[] versionComponents = version.split("\\.");
+    // This test was added in version 1.56.0, so check that the major and minor numbers are greater
+    // than that.
+    int major = Integer.parseInt(versionComponents[0]);
+    int minor = Integer.parseInt(versionComponents[1]);
+    return new Version(major, minor);
+  }
+
+  private static class Version {
+    public int major;
+    public int minor;
+
+    public Version(int major, int minor) {
+      this.major = major;
+      this.minor = minor;
+    }
+  }
 }

gax-java/gax/src/test/java/com/google/api/gax/rpc/ApiClientHeaderProviderTest.java

@@ -42,7 +42,8 @@ class ApiClientHeaderProviderTest {
   void testServiceHeaderDefault() {
     ApiClientHeaderProvider provider = ApiClientHeaderProvider.newBuilder().build();
     assertThat(provider.getHeaders().size()).isEqualTo(1);
-    assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT)).matches("^gl-java/.* gax/.*$");
+    assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
+        .matches("^gl-java/.* gax/.* protobuf/.*");
   }
 
   @Test
@@ -51,7 +52,7 @@ void testServiceHeaderManual() {
         ApiClientHeaderProvider.newBuilder().setClientLibToken("gccl", "1.2.3").build();
     assertThat(provider.getHeaders().size()).isEqualTo(1);
     assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
-        .matches("^gl-java/.* gccl/1\\.2\\.3 gax/.*$");
+        .matches("^gl-java/.* gccl/1\\.2\\.3--protobuf-.* gax/.* protobuf/.*");
   }
 
   @Test
@@ -64,7 +65,8 @@ void testServiceHeaderManualGapic() {
             .build();
     assertThat(provider.getHeaders().size()).isEqualTo(1);
     assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
-        .matches("^gl-java/.* gccl/4\\.5\\.6 gapic/7\\.8\\.9 gax/.* grpc/1\\.2\\.3$");
+        .matches(
+            "^gl-java/.* gccl/4\\.5\\.6--protobuf-.* gapic/7\\.8\\.9 gax/.* grpc/1\\.2\\.3 protobuf/.*");
   }
 
   @Test
@@ -76,7 +78,7 @@ void testServiceHeaderManualGrpc() {
             .build();
     assertThat(provider.getHeaders().size()).isEqualTo(1);
     assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
-        .matches("^gl-java/.* gccl/4\\.5\\.6 gax/.* grpc/1\\.2\\.3$");
+        .matches("^gl-java/.* gccl/4\\.5\\.6--protobuf-.* gax/.* grpc/1\\.2\\.3 protobuf/.*");
   }
 
   @Test
@@ -88,7 +90,7 @@ void testServiceHeaderGapic() {
             .build();
     assertThat(provider.getHeaders().size()).isEqualTo(1);
     assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
-        .matches("^gl-java/.* gapic/4\\.5\\.6 gax/.* grpc/1\\.2\\.3$");
+        .matches("^gl-java/.* gapic/4\\.5\\.6--protobuf-.* gax/.* grpc/1\\.2\\.3 protobuf/.*");
   }
 
   @Test
@@ -101,7 +103,7 @@ void testCloudResourcePrefixHeader() {
             .build();
     assertThat(provider.getHeaders().size()).isEqualTo(2);
     assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
-        .matches("^gl-java/.* gapic/4\\.5\\.6 gax/.* grpc/1\\.2\\.3$");
+        .matches("^gl-java/.* gapic/4\\.5\\.6--protobuf-.* gax/.* grpc/1\\.2\\.3 protobuf/.*");
     assertThat(provider.getHeaders().get(CLOUD_RESOURCE_PREFIX)).isEqualTo("test-prefix");
   }
 
@@ -117,7 +119,7 @@ void testCustomHeaderKeys() {
             .build();
     assertThat(provider.getHeaders().size()).isEqualTo(2);
     assertThat(provider.getHeaders().get("custom-header1"))
-        .matches("^gl-java/.* gapic/4\\.5\\.6 gax/.* grpc/1\\.2\\.3$");
+        .matches("^gl-java/.* gapic/4\\.5\\.6--protobuf-.* gax/.* grpc/1\\.2\\.3 protobuf/.*");
     assertThat(provider.getHeaders().get("custom-header2")).isEqualTo("test-prefix");
   }
 
@@ -131,7 +133,7 @@ void testQuotaProjectHeader() {
             .build();
     assertThat(provider.getHeaders().size()).isEqualTo(2);
     assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
-        .matches("^gl-java/.* gccl/1\\.2\\.3 gax/.*$");
+        .matches("^gl-java/.* gccl/1\\.2\\.3--protobuf-.* gax/.* protobuf/.*");
     assertThat(provider.getHeaders().get(ApiClientHeaderProvider.QUOTA_PROJECT_ID_HEADER_KEY))
         .matches(quotaProjectHeaderValue);
   }
@@ -149,4 +151,22 @@ void testApiVersionHeader() {
     assertThat(
         emptyProvider.getHeaders().get(ApiClientHeaderProvider.API_VERSION_HEADER_KEY).isEmpty());
   }
+
+  @Test
+  void testNonGapicGeneratedLibToken_doesNotAppendProtobufVersion() {
+    ApiClientHeaderProvider provider =
+        ApiClientHeaderProvider.newBuilder().setGeneratedLibToken("other-token", "1.2.3").build();
+
+    assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
+        .matches("^gl-java/.* other-token/1.2.3 gax/.* protobuf/.*");
+  }
+
+  @Test
+  void testNonGcclGeneratedLibToken_doesNotAppendProtobufVersion() {
+    ApiClientHeaderProvider provider =
+        ApiClientHeaderProvider.newBuilder().setClientLibToken("other-token", "1.2.3").build();
+
+    assertThat(provider.getHeaders().get(X_GOOG_API_CLIENT))
+        .matches("^gl-java/.* other-token/1.2.3 gax/.* protobuf/.*");
+  }
 }

showcase/gapic-showcase/src/test/java/com/google/showcase/v1beta1/it/ITApiVersionHeaders.java → showcase/gapic-showcase/src/test/java/com/google/showcase/v1beta1/it/ITVersionHeaders.java

@@ -17,6 +17,7 @@
 
 import static com.google.common.truth.Truth.assertThat;
 import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 import com.google.api.gax.httpjson.*;
 import com.google.api.gax.rpc.ApiClientHeaderProvider;
@@ -31,6 +32,7 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.concurrent.TimeUnit;
+import java.util.regex.Pattern;
 import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
@@ -39,13 +41,19 @@
 //  https://github.com/googleapis/gapic-showcase/pull/1456
 // TODO: watch for showcase gRPC trailer changes suggested in
 // https://github.com/googleapis/gapic-showcase/pull/1509#issuecomment-2089147103
-class ITApiVersionHeaders {
+class ITVersionHeaders {
   private static final String HTTP_RESPONSE_HEADER_STRING =
       "x-showcase-request-" + ApiClientHeaderProvider.API_VERSION_HEADER_KEY;
+  private static final String HTTP_CLIENT_API_HEADER_KEY =
+      "x-showcase-request-" + ApiClientHeaderProvider.getDefaultApiClientHeaderKey();
   private static final Metadata.Key<String> API_VERSION_HEADER_KEY =
       Metadata.Key.of(
           ApiClientHeaderProvider.API_VERSION_HEADER_KEY, Metadata.ASCII_STRING_MARSHALLER);
 
+  private static final Metadata.Key<String> API_CLIENT_HEADER_KEY =
+      Metadata.Key.of(
+          ApiClientHeaderProvider.getDefaultApiClientHeaderKey(), Metadata.ASCII_STRING_MARSHALLER);
+
   private static final String EXPECTED_ECHO_API_VERSION = "v1_20240408";
   private static final String CUSTOM_API_VERSION = "user-supplied-version";
   private static final String EXPECTED_EXCEPTION_MESSAGE =
@@ -323,4 +331,25 @@ void testHttpJsonCompliance_userApiVersionSetSuccess() throws IOException {
       assertThat(headerValue).isEqualTo(CUSTOM_API_VERSION);
     }
   }
+
+  @Test
+  void testGrpcCall_sendsCorrectApiClientHeader() {
+    Pattern defautlGrpcHeaderPattern =
+        Pattern.compile("gl-java/.* gapic/.*?--protobuf-.* gax/.* grpc/.* protobuf/.*");
+    grpcClient.echo(EchoRequest.newBuilder().build());
+    String headerValue = grpcInterceptor.metadata.get(API_CLIENT_HEADER_KEY);
+    assertTrue(defautlGrpcHeaderPattern.matcher(headerValue).matches());
+  }
+
+  @Test
+  void testHttpJson_sendsCorrectApiClientHeader() {
+    Pattern defautlHttpHeaderPattern =
+        Pattern.compile("gl-java/.* gapic/.*?--protobuf-.* gax/.* rest/ protobuf/.*");
+    httpJsonClient.echo(EchoRequest.newBuilder().build());
+    ArrayList<String> headerValues =
+        (ArrayList<String>)
+            httpJsonInterceptor.metadata.getHeaders().get(HTTP_CLIENT_API_HEADER_KEY);
+    String headerValue = headerValues.get(0);
+    assertTrue(defautlHttpHeaderPattern.matcher(headerValue).matches());
+  }
 }