com.google.devtools.build.lib.remote.blobstore.http.HttpUploadHandler.java Source code

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Here is the source code for com.google.devtools.build.lib.remote.blobstore.http.HttpUploadHandler.java

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// Copyright 2018 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.lib.remote.blobstore.http;

import static com.google.common.base.Preconditions.checkState;

import com.google.auth.Credentials;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.DefaultHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpChunkedInput;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpHeaderValues;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpUtil;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.handler.stream.ChunkedStream;
import io.netty.util.internal.StringUtil;
import java.io.IOException;

/** ChannelHandler for uploads. */
final class HttpUploadHandler extends AbstractHttpHandler<FullHttpResponse> {

    public HttpUploadHandler(Credentials credentials) {
        super(credentials);
    }

    @SuppressWarnings("FutureReturnValueIgnored")
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, FullHttpResponse response) {
        if (!response.decoderResult().isSuccess()) {
            failAndClose(new IOException("Failed to parse the HTTP response."), ctx);
            return;
        }
        try {
            checkState(userPromise != null, "response before request");
            if (!response.status().equals(HttpResponseStatus.OK)
                    && !response.status().equals(HttpResponseStatus.ACCEPTED)
                    && !response.status().equals(HttpResponseStatus.CREATED)
                    && !response.status().equals(HttpResponseStatus.NO_CONTENT)) {
                // Supporting more than OK status to be compatible with nginx webdav.
                String errorMsg = response.status().toString();
                if (response.content().readableBytes() > 0) {
                    byte[] data = new byte[response.content().readableBytes()];
                    response.content().readBytes(data);
                    errorMsg += "\n" + new String(data, HttpUtil.getCharset(response));
                }
                failAndResetUserPromise(new HttpException(response, errorMsg, null));
            } else {
                succeedAndResetUserPromise();
            }
        } finally {
            if (!HttpUtil.isKeepAlive(response)) {
                ctx.close();
            }
        }
    }

    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        checkState(userPromise == null, "handler can't be shared between pipelines.");
        userPromise = promise;
        if (!(msg instanceof UploadCommand)) {
            failAndResetUserPromise(
                    new IllegalArgumentException("Unsupported message type: " + StringUtil.simpleClassName(msg)));
            return;
        }
        HttpRequest request = buildRequest((UploadCommand) msg);
        addCredentialHeaders(request, ((UploadCommand) msg).uri());
        HttpChunkedInput body = buildBody((UploadCommand) msg);
        ctx.writeAndFlush(request).addListener((f) -> {
            if (f.isSuccess()) {
                return;
            }
            failAndClose(f.cause(), ctx);
        });
        ctx.writeAndFlush(body).addListener((f) -> {
            if (f.isSuccess()) {
                return;
            }
            failAndClose(f.cause(), ctx);
        });
    }

    private HttpRequest buildRequest(UploadCommand msg) {
        HttpRequest request = new DefaultHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.PUT,
                constructPath(msg.uri(), msg.hash(), msg.casUpload()));
        request.headers().set(HttpHeaderNames.HOST, constructHost(msg.uri()));
        request.headers().set(HttpHeaderNames.ACCEPT, "*/*");
        request.headers().set(HttpHeaderNames.CONTENT_LENGTH, msg.contentLength());
        request.headers().set(HttpHeaderNames.CONNECTION, HttpHeaderValues.KEEP_ALIVE);
        return request;
    }

    private HttpChunkedInput buildBody(UploadCommand msg) {
        return new HttpChunkedInput(new ChunkedStream(msg.data()));
    }

    @SuppressWarnings("FutureReturnValueIgnored")
    private void failAndClose(Throwable t, ChannelHandlerContext ctx) {
        try {
            failAndResetUserPromise(t);
        } finally {
            ctx.close();
        }
    }
}