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AVRO-129. Add HTTP-based RPC client and server.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/avro/trunk@820442 13f79535-47bb-0310-9956-ffa450edef68
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/** | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you 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. | ||
*/ | ||
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package org.apache.avro.ipc; | ||
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import java.io.IOException; | ||
import java.nio.ByteBuffer; | ||
import java.util.List; | ||
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import javax.servlet.ServletException; | ||
import javax.servlet.http.HttpServlet; | ||
import javax.servlet.http.HttpServletRequest; | ||
import javax.servlet.http.HttpServletResponse; | ||
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import org.apache.avro.AvroRuntimeException; | ||
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import org.mortbay.jetty.servlet.Context; | ||
import org.mortbay.jetty.servlet.ServletHolder; | ||
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public class HttpServer extends HttpServlet implements Server { | ||
private Responder responder; | ||
private org.mortbay.jetty.Server server; | ||
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public HttpServer(Responder responder, int port) throws IOException { | ||
this.responder = responder; | ||
this.server = new org.mortbay.jetty.Server(port); | ||
new Context(server,"/").addServlet(new ServletHolder(this), "/*"); | ||
try { | ||
server.start(); | ||
} catch (Exception e) { | ||
throw new AvroRuntimeException(e); | ||
} | ||
} | ||
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@Override | ||
public int getPort() { return server.getConnectors()[0].getLocalPort(); } | ||
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@Override | ||
public void close() { | ||
try { | ||
server.stop(); | ||
} catch (Exception e) { | ||
throw new AvroRuntimeException(e); | ||
} | ||
} | ||
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public void doPost(HttpServletRequest request, HttpServletResponse response) | ||
throws IOException, ServletException { | ||
response.setContentType("avro/binary"); | ||
List<ByteBuffer> requestBuffers = | ||
HttpTransceiver.readBuffers(request.getInputStream()); | ||
try { | ||
List<ByteBuffer> responseBuffers = | ||
responder.respond(requestBuffers); | ||
response.setContentLength(HttpTransceiver.getLength(responseBuffers)); | ||
HttpTransceiver.writeBuffers(responseBuffers, response.getOutputStream()); | ||
} catch (AvroRuntimeException e) { | ||
throw new ServletException(e); | ||
} | ||
} | ||
} |
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/** | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you 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. | ||
*/ | ||
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package org.apache.avro.ipc; | ||
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import java.io.IOException; | ||
import java.io.InputStream; | ||
import java.io.OutputStream; | ||
import java.io.EOFException; | ||
import java.nio.ByteBuffer; | ||
import java.util.ArrayList; | ||
import java.util.List; | ||
import java.net.URL; | ||
import java.net.URLConnection; | ||
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import org.slf4j.Logger; | ||
import org.slf4j.LoggerFactory; | ||
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/** An HTTP-based {@link Transceiver} implementation. */ | ||
public class HttpTransceiver extends Transceiver { | ||
private static final Logger LOG | ||
= LoggerFactory.getLogger(HttpTransceiver.class); | ||
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private URL url; | ||
private URLConnection connection; | ||
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public HttpTransceiver(URL url) { this.url = url; } | ||
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public String getRemoteName() { return this.url.toString(); } | ||
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@Override | ||
public synchronized List<ByteBuffer> transceive(List<ByteBuffer> request) | ||
throws IOException { | ||
this.connection = url.openConnection(); | ||
connection.setRequestProperty("Content-Type", "avro/binary"); | ||
connection.setRequestProperty("Content-Length", | ||
Integer.toString(getLength(request))); | ||
connection.setDoOutput(true); | ||
LOG.info("Connecting to: "+url); | ||
return super.transceive(request); | ||
} | ||
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public synchronized List<ByteBuffer> readBuffers() throws IOException { | ||
return readBuffers(connection.getInputStream()); | ||
} | ||
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public synchronized void writeBuffers(List<ByteBuffer> buffers) | ||
throws IOException { | ||
writeBuffers(buffers, connection.getOutputStream()); | ||
} | ||
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static int getLength(List<ByteBuffer> buffers) { | ||
int length = 0; | ||
for (ByteBuffer buffer : buffers) { | ||
length += 4; | ||
length += buffer.remaining(); | ||
} | ||
length += 4; | ||
return length; | ||
} | ||
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static List<ByteBuffer> readBuffers(InputStream in) | ||
throws IOException { | ||
List<ByteBuffer> buffers = new ArrayList<ByteBuffer>(); | ||
while (true) { | ||
int length = (in.read()<<24)+(in.read()<<16)+(in.read()<<8)+in.read(); | ||
if (length == 0) { // end of buffers | ||
return buffers; | ||
} | ||
ByteBuffer buffer = ByteBuffer.allocate(length); | ||
while (buffer.hasRemaining()) { | ||
int p = buffer.position(); | ||
int i = in.read(buffer.array(), p, buffer.remaining()); | ||
if (i < 0) | ||
throw new EOFException("Unexpected EOF"); | ||
buffer.position(p+i); | ||
} | ||
buffer.flip(); | ||
buffers.add(buffer); | ||
} | ||
} | ||
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static void writeBuffers(List<ByteBuffer> buffers, OutputStream out) | ||
throws IOException { | ||
for (ByteBuffer buffer : buffers) { | ||
writeLength(buffer.limit(), out); // length-prefix | ||
out.write(buffer.array(), buffer.position(), buffer.remaining()); | ||
buffer.position(buffer.limit()); | ||
} | ||
writeLength(0, out); // null-terminate | ||
} | ||
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private static void writeLength(int length, OutputStream out) | ||
throws IOException { | ||
out.write(0xff & (length >>> 24)); | ||
out.write(0xff & (length >>> 16)); | ||
out.write(0xff & (length >>> 8)); | ||
out.write(0xff & length); | ||
} | ||
} | ||
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/** | ||
* Licensed to the Apache Software Foundation (ASF) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. The ASF licenses this file | ||
* to you 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 org.apache.avro; | ||
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import java.util.Random; | ||
import org.apache.avro.ipc.HttpServer; | ||
import org.apache.avro.ipc.HttpTransceiver; | ||
import org.apache.avro.specific.SpecificRequestor; | ||
import org.apache.avro.specific.SpecificResponder; | ||
import org.apache.avro.test.Simple; | ||
import org.junit.Before; | ||
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import java.net.URL; | ||
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public class TestProtocolHttp extends TestProtocolSpecific { | ||
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@Before | ||
public void testStartServer() throws Exception { | ||
server = | ||
new HttpServer(new SpecificResponder(Simple.class, new TestImpl()), 0); | ||
client = | ||
new HttpTransceiver(new URL("http://127.0.0.1:"+server.getPort()+"/")); | ||
proxy = (Simple)SpecificRequestor.getClient(Simple.class, client); | ||
} | ||
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} |