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Language Server Protocol implementation for Smithy
/*
* Copyright 2020 Amazon.com, Inc. or its affiliates. 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.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 software.amazon.smithy.lsp;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.util.Optional;
import org.eclipse.lsp4j.jsonrpc.Launcher;
import org.eclipse.lsp4j.launch.LSPLauncher;
import org.eclipse.lsp4j.services.LanguageClient;
/**
* Main launcher for the Language server, started by the editor.
*/
public final class Main {
private Main() {
}
/**
* Launch the LSP and wait for it to terminate.
*
* @param in input stream for communication
* @param out output stream for communication
* @return Empty Optional if service terminated successfully, error otherwise
*/
public static Optional launch(InputStream in, OutputStream out) {
SmithyLanguageServer server = new SmithyLanguageServer();
Launcher launcher = LSPLauncher.createServerLauncher(
server,
exitOnClose(in),
out);
LanguageClient client = launcher.getRemoteProxy();
server.connect(client);
try {
launcher.startListening().get();
return Optional.empty();
} catch (Exception e) {
return Optional.of(e);
}
}
private static InputStream exitOnClose(InputStream delegate) {
return new InputStream() {
@Override
public int read() throws IOException {
int result = delegate.read();
if (result < 0) {
System.exit(0);
}
return result;
}
};
}
/**
* @param args Arguments passed to launch server. First argument must either be
* a port number for socket connection, or 0 to use STDIN and STDOUT
* for communication
*/
public static void main(String[] args) {
Socket socket = null;
InputStream in;
OutputStream out;
try {
String port = args[0];
// If port is set to "0", use System.in/System.out.
if (port.equals("0")) {
in = System.in;
out = System.out;
} else {
socket = new Socket("localhost", Integer.parseInt(port));
in = socket.getInputStream();
out = socket.getOutputStream();
}
Optional launchFailure = launch(in, out);
if (launchFailure.isPresent()) {
throw launchFailure.get();
} else {
System.out.println("Server terminated without errors");
}
} catch (ArrayIndexOutOfBoundsException e) {
System.out.println("Missing port argument");
} catch (NumberFormatException e) {
System.out.println("Port number must be a valid integer");
} catch (Exception e) {
System.out.println(e);
e.printStackTrace();
} finally {
try {
if (socket != null) {
socket.close();
}
} catch (Exception e) {
System.out.println("Failed to close the socket");
System.out.println(e);
}
}
}
}
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