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/*
* Copyright 2014, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package io.grpc.netty;
import static io.grpc.internal.GrpcUtil.CONTENT_TYPE_KEY;
import static io.grpc.internal.GrpcUtil.USER_AGENT_KEY;
import static io.netty.util.CharsetUtil.UTF_8;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import io.grpc.Metadata;
import io.grpc.Status;
import io.grpc.internal.GrpcUtil;
import io.grpc.internal.SharedResourceHolder.Resource;
import io.grpc.internal.TransportFrameUtil;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.handler.codec.http2.Http2Exception;
import io.netty.handler.codec.http2.Http2Headers;
import io.netty.util.AsciiString;
import io.netty.util.AttributeKey;
import io.netty.util.concurrent.DefaultThreadFactory;
import java.io.IOException;
import java.nio.channels.ClosedChannelException;
import java.util.Map;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.TimeUnit;
import javax.net.ssl.SSLSession;
/**
* Common utility methods.
*/
@VisibleForTesting
class Utils {
public static final AsciiString STATUS_OK = AsciiString.of("200");
public static final AsciiString HTTP_METHOD = AsciiString.of(GrpcUtil.HTTP_METHOD);
public static final AsciiString HTTPS = AsciiString.of("https");
public static final AsciiString HTTP = AsciiString.of("http");
public static final AsciiString CONTENT_TYPE_HEADER = AsciiString.of(CONTENT_TYPE_KEY.name());
public static final AsciiString CONTENT_TYPE_GRPC = AsciiString.of(GrpcUtil.CONTENT_TYPE_GRPC);
public static final AsciiString TE_HEADER = AsciiString.of("te");
public static final AsciiString TE_TRAILERS = AsciiString.of(GrpcUtil.TE_TRAILERS);
public static final AsciiString USER_AGENT = AsciiString.of(USER_AGENT_KEY.name());
public static final Resource DEFAULT_BOSS_EVENT_LOOP_GROUP =
new DefaultEventLoopGroupResource(1, "grpc-default-boss-ELG");
public static final Resource DEFAULT_WORKER_EVENT_LOOP_GROUP =
new DefaultEventLoopGroupResource(0, "grpc-default-worker-ELG");
public static final AttributeKey SSL_SESSION_ATTR_KEY =
AttributeKey.valueOf(SSLSession.class, "ssl-session");
@VisibleForTesting
static boolean validateHeaders = false;
public static Metadata convertHeaders(Http2Headers http2Headers) {
return new Metadata(convertHeadersToArray(http2Headers));
}
private static byte[][] convertHeadersToArray(Http2Headers http2Headers) {
// The Netty AsciiString class is really just a wrapper around a byte[] and supports
// arbitrary binary data, not just ASCII.
byte[][] headerValues = new byte[http2Headers.size() * 2][];
int i = 0;
for (Map.Entry entry : http2Headers) {
headerValues[i++] = bytes(entry.getKey());
headerValues[i++] = bytes(entry.getValue());
}
return TransportFrameUtil.toRawSerializedHeaders(headerValues);
}
private static byte[] bytes(CharSequence seq) {
if (seq instanceof AsciiString) {
// Fast path - sometimes copy.
AsciiString str = (AsciiString) seq;
return str.isEntireArrayUsed() ? str.array() : str.toByteArray();
}
// Slow path - copy.
return seq.toString().getBytes(UTF_8);
}
public static Http2Headers convertClientHeaders(Metadata headers,
AsciiString scheme,
AsciiString defaultPath,
AsciiString authority,
AsciiString userAgent) {
Preconditions.checkNotNull(defaultPath, "defaultPath");
Preconditions.checkNotNull(authority, "authority");
return GrpcHttp2Headers.clientRequestHeaders(
TransportFrameUtil.toHttp2Headers(headers),
authority,
defaultPath,
HTTP_METHOD,
scheme,
userAgent);
}
public static Http2Headers convertServerHeaders(Metadata headers) {
return GrpcHttp2Headers.serverResponseHeaders(TransportFrameUtil.toHttp2Headers(headers));
}
public static Metadata convertTrailers(Http2Headers http2Headers) {
return new Metadata(convertHeadersToArray(http2Headers));
}
public static Http2Headers convertTrailers(Metadata trailers, boolean headersSent) {
if (!headersSent) {
return convertServerHeaders(trailers);
}
return GrpcHttp2Headers.serverResponseTrailers(TransportFrameUtil.toHttp2Headers(trailers));
}
public static Status statusFromThrowable(Throwable t) {
Status s = Status.fromThrowable(t);
if (s.getCode() != Status.Code.UNKNOWN) {
return s;
}
// TODO(ejona): reenable once startup races are resolved; ClosedChannelException is being seen
// still. Some tests are asserting UNAVAILABLE and were "working" previously but are now
// detecting that our behavior is flaky. See #1330
if (false && t instanceof ClosedChannelException) {
// ClosedChannelException is used any time the Netty channel is closed. Proper error
// processing requires remembering the error that occurred before this one and using it
// instead.
return Status.UNKNOWN.withCause(t);
}
if (t instanceof IOException) {
return Status.UNAVAILABLE.withCause(t);
}
if (t instanceof Http2Exception) {
return Status.INTERNAL.withCause(t);
}
return s;
}
private static class DefaultEventLoopGroupResource implements Resource {
private final String name;
private final int numEventLoops;
DefaultEventLoopGroupResource(int numEventLoops, String name) {
this.name = name;
this.numEventLoops = numEventLoops;
}
@Override
public EventLoopGroup create() {
// Use Netty's DefaultThreadFactory in order to get the benefit of FastThreadLocal.
boolean useDaemonThreads = true;
ThreadFactory threadFactory = new DefaultThreadFactory(name, useDaemonThreads);
int parallelism = numEventLoops == 0
? Runtime.getRuntime().availableProcessors() * 2 : numEventLoops;
return new NioEventLoopGroup(parallelism, threadFactory);
}
@Override
public void close(EventLoopGroup instance) {
instance.shutdownGracefully(0, 0, TimeUnit.SECONDS);
}
@Override
public String toString() {
return name;
}
}
private Utils() {
// Prevents instantiation
}
}
