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// Copyright 2014 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.server;
import com.google.common.base.Preconditions;
import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;
/**
* This class models a response from the {@link RPCServer}. This is a
* tuple of an error message and the exit status. The encoding of the response
* is extremely simple {@link #toString()}:
*
* <ul><li>Iff a message is present, the wire format is
* <pre>message + '\n' + exit code as string + '\n'</pre>
* </li>
* <li>Otherwise it's just the exit code as string + '\n'</li>
* </ul>
*/
final class ServerResponse {
/**
* Parses an input string into a {@link ServerResponse} object.
*/
public static ServerResponse parseFrom(String input) {
if (input.charAt(input.length() - 1) != '\n') {
String msg = "Response must end with newline (" + input + ")";
throw new IllegalArgumentException(msg);
}
int newlineAt = input.lastIndexOf('\n', input.length() - 2);
final String exitStatusString;
final String errorMessage;
if (newlineAt == -1) {
errorMessage = "";
exitStatusString = input.substring(0, input.length() - 1);
} else {
errorMessage = input.substring(0, newlineAt);
exitStatusString = input.substring(newlineAt + 1, input.length() - 1);
}
return new ServerResponse(errorMessage, Integer.parseInt(exitStatusString));
}
/**
* Parses {@code bytes} into a {@link ServerResponse} instance, assuming
* Latin 1 encoding.
*/
public static ServerResponse parseFrom(byte[] bytes) {
try {
return parseFrom(new String(bytes, "ISO-8859-1"));
} catch (UnsupportedEncodingException e) {
throw new AssertionError(e); // Latin 1 is everywhere.
}
}
/**
* Parses {@code bytes} into a {@link ServerResponse} instance, assuming
* Latin 1 encoding.
*/
public static ServerResponse parseFrom(ByteArrayOutputStream bytes) {
return parseFrom(bytes.toByteArray());
}
private final String errorMessage;
private final int exitStatus;
/**
* Construct a new instance given an error message and an exit status.
*/
public ServerResponse(String errorMessage, int exitStatus) {
Preconditions.checkNotNull(errorMessage);
this.errorMessage = errorMessage;
this.exitStatus = exitStatus;
}
/**
* The wire representation of this response object.
*/
@Override
public String toString() {
if (errorMessage.length() == 0) {
return Integer.toString(exitStatus) + '\n';
}
return errorMessage + '\n' + exitStatus + '\n';
}
@Override
public boolean equals(Object other) {
if (!(other instanceof ServerResponse)) {
return false;
}
ServerResponse otherResponse = (ServerResponse) other;
return exitStatus == otherResponse.exitStatus
&& errorMessage.equals(otherResponse.errorMessage);
}
@Override
public int hashCode() {
return exitStatus * 31 ^ errorMessage.hashCode();
}
}
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