Brian Wilkerson
23bee1698f
Change-Id: I2087c3c9d25cdf3266142ba57bb8dbc57bc3fc46 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/194002 Commit-Queue: Brian Wilkerson <brianwilkerson@google.com> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
111 lines
3.1 KiB
Dart
111 lines
3.1 KiB
Dart
// Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import 'dart:io' as io;
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import 'package:args/args.dart';
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import 'log/log.dart';
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import 'server.dart';
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/// Start a web server that will allow an instrumentation log to be viewed.
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void main(List<String> args) {
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var driver = Driver();
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driver.start(args);
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}
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/// The main driver that configures and starts the web server.
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class Driver {
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/// The flag used to specify that the user wants to have help text printed but
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/// that no other work should be done.
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static String helpFlag = 'help';
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/// The option used to specify the port on which the server should listen for
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/// requests.
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static String portOption = 'port';
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/// The port that will be used if no port number is provided on the command
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/// line.
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static int defaultPortNumber = 11000;
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/// Initialize a newly created driver.
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Driver();
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/// Create and return the parser used to parse the command-line arguments.
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ArgParser createParser() {
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var parser = ArgParser();
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parser.addFlag(helpFlag, help: 'Print this help text', negatable: false);
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parser.addOption(portOption,
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help: 'The port number on which the server should listen for requests',
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defaultsTo: defaultPortNumber.toString());
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return parser;
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}
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/// Print usage information.
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void printUsage(ArgParser parser,
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{String? error, Object? exception, StackTrace? stackTrace}) {
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if (error != null) {
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print(error);
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print('');
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}
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print('log_viewer [options] logFile');
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print('');
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print('Usage:');
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print('');
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print(
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'The "logFile" is the file containing the content of the log that is being viewed');
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print('');
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print('Options:');
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print(parser.usage);
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if (exception != null) {
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print(exception);
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}
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if (stackTrace != null) {
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print(stackTrace);
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}
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}
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/// Use the given command-line [args] to configure and start the web server.
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void start(List<String> args) {
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var parser = createParser();
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var options = parser.parse(args);
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if (options[helpFlag]) {
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printUsage(parser);
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return;
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}
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var port = defaultPortNumber;
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try {
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port = int.parse(options[portOption]);
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} catch (exception) {
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printUsage(parser, error: 'Invalid port number');
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return;
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}
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var arguments = options.rest;
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if (arguments.length != 1) {
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printUsage(parser, error: 'Missing log file');
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return;
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}
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var fileName = arguments[0];
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var logFile = io.File(fileName);
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List<String> lines;
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try {
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lines = logFile.readAsLinesSync();
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} catch (exception, stackTrace) {
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printUsage(parser,
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error: 'Could not read file "$fileName":',
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exception: exception,
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stackTrace: stackTrace);
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return;
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}
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print('Log file contains ${lines.length} lines');
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var log = InstrumentationLog(<String>[logFile.path], lines);
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var server = WebServer(log);
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server.serveHttp(port);
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print('logViewer is listening on http://localhost:$port/log');
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}
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}
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