com.facebook.buck.intellij.ideabuck.config.BuckWSServerPortUtils.java Source code

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Here is the source code for com.facebook.buck.intellij.ideabuck.config.BuckWSServerPortUtils.java

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/*
 * Copyright 2015-present Facebook, Inc.
 *
 * 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.facebook.buck.intellij.ideabuck.config;

import com.google.common.base.Strings;
import com.intellij.execution.ExecutionException;
import com.intellij.execution.configurations.GeneralCommandLine;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public final class BuckWSServerPortUtils {
    private static final int CONNECTION_FAILED_PORT = -1;

    private static final String SEARCH_FOR = "http.port=";

    public static int getPort(String runInPath) throws NumberFormatException, IOException, ExecutionException {
        BuckSettingsProvider.State state = BuckSettingsProvider.getInstance().getState();
        if (state == null) {
            throw new RuntimeException("Cannot load ideabuck settings.");
        }

        String exec = state.buckExecutable;

        if (Strings.isNullOrEmpty(exec)) {
            throw new RuntimeException("Buck executable is not defined in settings.");
        }

        GeneralCommandLine commandLine = new GeneralCommandLine();
        commandLine.setExePath(exec);
        commandLine.withWorkDirectory(runInPath);
        commandLine.addParameter("server");
        commandLine.addParameter("status");
        commandLine.addParameter("--http-port");
        commandLine.setRedirectErrorStream(true);

        Process p = commandLine.createProcess();
        BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()));

        int port = CONNECTION_FAILED_PORT;
        String line;
        while ((line = reader.readLine()) != null) {
            if (line.startsWith(SEARCH_FOR)) {
                port = Integer.parseInt(line.substring(SEARCH_FOR.length()));
                if (port == CONNECTION_FAILED_PORT) {
                    // if the buck server is off, and it gives us -1, throw this exception
                    String error = "Your buck server may be turned off, since the Buck daemon is on port " + port
                            + ".\nTry adding to your '.buckconfig.local' or '.buckconfig' file,"
                            + " if you don't have it already set:\n" + "[httpserver]\n" + "    port = 0\n"
                            + "After that, restart IntelliJ or reopen your project.\n";
                    throw new RuntimeException(error);
                }
            }
        }
        return port;
    }

    private BuckWSServerPortUtils() {
    }
}