Create ConscryptLoader for code sharing

alts/src/main/java/io/grpc/alts/internal/AesGcmAeadCrypter.java

@@ -18,7 +18,7 @@ package io.grpc.alts.internal;
 
 import static com.google.common.base.Preconditions.checkArgument;
 
-import java.lang.reflect.Method;
+import io.grpc.internal.ConscryptLoader;
 import java.nio.ByteBuffer;
 import java.security.GeneralSecurityException;
 import java.security.Provider;
@@ -111,8 +111,9 @@ final class AesGcmAeadCrypter implements AeadCrypter {
   }
 
   private static Provider getConscrypt() {
-    // This is equivalent to if (Conscrypt.isAvailable()) return Conscrypt.newProvider();
-
+    if (!ConscryptLoader.isPresent()) {
+      return null;
+    }
     // Conscrypt 2.1.0 or later is required. If an older version is used, it will fail with these
     // sorts of errors:
     //     "The underlying Cipher implementation does not support this method"
@@ -120,42 +121,11 @@ final class AesGcmAeadCrypter implements AeadCrypter {
     //
     // While we could use Conscrypt.version() to check compatibility, that is _very_ verbose via
     // reflection. In practice, old conscrypts are probably not much of a problem.
-    Class<?> conscryptClass;
     try {
-      conscryptClass = Class.forName("org.conscrypt.Conscrypt");
-    } catch (ClassNotFoundException ex) {
-      logger.log(Level.FINE, "Could not find Conscrypt", ex);
+      return ConscryptLoader.newProvider();
+    } catch (Throwable t) {
+      logger.log(Level.INFO, "Could not load Conscrypt. Will use slower JDK implementation", t);
       return null;
     }
-    Method method;
-    try {
-      method = conscryptClass.getMethod("newProvider");
-    } catch (SecurityException ex) {
-      logger.log(Level.FINE, "Could not find Conscrypt factory method", ex);
-      return null;
-    } catch (NoSuchMethodException ex) {
-      logger.log(Level.WARNING, "Could not find Conscrypt factory method", ex);
-      return null;
-    }
-    Object provider;
-    try {
-      provider = method.invoke(null);
-    } catch (IllegalAccessException ex) {
-      logger.log(Level.WARNING, "Could not call Conscrypt factory method", ex);
-      return null;
-    } catch (Throwable ex) {
-      // This is probably an InvocationTargetException, which means something's wrong with the JNI
-      // loading. Maybe the platform is not supported. We could have used Conscrypt.isAvailable(),
-      // but it just catches Throwable as well
-      logger.log(Level.WARNING, "Failed calling Conscrypt factory method", ex);
-      return null;
-    }
-    if (!(provider instanceof Provider)) {
-      logger.log(
-          Level.WARNING, "Could not load Conscrypt. Returned provider was not a Provider: {0}",
-          provider.getClass().getName());
-      return null;
-    }
-    return (Provider) provider;
   }
 }

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

@@ -0,0 +1,80 @@
+/*
+ * Copyright 2019 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.internal;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.security.Provider;
+
+/**
+ * Utility to load dynamically Conscrypt when it is available.
+ */
+public final class ConscryptLoader {
+  private static final Method NEW_PROVIDER_METHOD;
+  private static final Method IS_CONSCRYPT_METHOD;
+
+  static {
+    Method newProvider;
+    Method isConscrypt;
+    try {
+      Class<?> conscryptClass = Class.forName("org.conscrypt.Conscrypt");
+      newProvider = conscryptClass.getMethod("newProvider");
+      isConscrypt = conscryptClass.getMethod("isConscrypt", Provider.class);
+    } catch (ClassNotFoundException ex) {
+      newProvider = null;
+      isConscrypt = null;
+    } catch (NoSuchMethodException ex) {
+      throw new AssertionError(ex);
+    }
+    NEW_PROVIDER_METHOD = newProvider;
+    IS_CONSCRYPT_METHOD = isConscrypt;
+  }
+
+  /**
+   * Returns {@code true} when the Conscrypt Java classes are available. Does not imply it actually
+   * works on this platform.
+   */
+  public static boolean isPresent() {
+    return NEW_PROVIDER_METHOD != null;
+  }
+
+  /** Same as {@code Conscrypt.isConscrypt(Provider)}. */
+  public static boolean isConscrypt(Provider provider) {
+    if (!isPresent()) {
+      return false;
+    }
+    try {
+      return (Boolean) IS_CONSCRYPT_METHOD.invoke(null, provider);
+    } catch (IllegalAccessException ex) {
+      throw new AssertionError(ex);
+    } catch (InvocationTargetException ex) {
+      throw new AssertionError(ex);
+    }
+  }
+
+  /** Same as {@code Conscrypt.newProvider()}. */
+  public static Provider newProvider() throws Throwable {
+    if (!isPresent()) {
+      Class.forName("org.conscrypt.Conscrypt");
+      throw new AssertionError("Unexpected failure referencing Conscrypt class");
+    }
+    // Exceptions here probably mean something's wrong with the JNI loading. Maybe the platform is
+    // not supported. It's an error, but it may occur in some environments as part of normal
+    // operation. It's too hard to distinguish "normal" from "abnormal" failures here.
+    return (Provider) NEW_PROVIDER_METHOD.invoke(null);
+  }
+}

testing/src/main/java/io/grpc/internal/testing/TestUtils.java

@@ -17,6 +17,7 @@
 package io.grpc.internal.testing;
 
 import com.google.common.base.Throwables;
+import io.grpc.internal.ConscryptLoader;
 import java.io.BufferedInputStream;
 import java.io.BufferedOutputStream;
 import java.io.File;
@@ -25,8 +26,6 @@ import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
 import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.net.UnknownHostException;
@@ -163,33 +162,22 @@ public class TestUtils {
       conscryptInstallAttempted = true;
       return;
     }
-    Class<?> conscrypt;
-    try {
-      conscrypt = Class.forName("org.conscrypt.Conscrypt");
-    } catch (ClassNotFoundException ex) {
+    if (!ConscryptLoader.isPresent()) {
       conscryptInstallAttempted = true;
       return;
     }
-    Method newProvider;
-    try {
-      newProvider = conscrypt.getMethod("newProvider");
-    } catch (NoSuchMethodException ex) {
-      throw new RuntimeException("Could not find newProvider method on Conscrypt", ex);
-    }
     Provider provider;
     try {
-      provider = (Provider) newProvider.invoke(null);
-    } catch (IllegalAccessException ex) {
-      throw new RuntimeException("Could not invoke Conscrypt.newProvider", ex);
-    } catch (InvocationTargetException ex) {
-      Throwable root = Throwables.getRootCause(ex);
+      provider = ConscryptLoader.newProvider();
+    } catch (Throwable t) {
+      Throwable root = Throwables.getRootCause(t);
       // Conscrypt uses a newer version of glibc than available on RHEL 6
       if (root instanceof UnsatisfiedLinkError && root.getMessage() != null
           && root.getMessage().contains("GLIBC_2.14")) {
         conscryptInstallAttempted = true;
         return;
       }
-      throw new RuntimeException("Could not invoke Conscrypt.newProvider", ex);
+      throw new RuntimeException("Could not create Conscrypt provider", t);
     }
     Security.addProvider(provider);
     conscryptInstallAttempted = true;