Remove dead code related to the diagnostics server.

pkg/analysis_server/lib/src/status/get_handler2.dart

Index: pkg/analysis_server/lib/src/status/get_handler2.dart
diff --git a/pkg/analysis_server/lib/src/status/get_handler2.dart b/pkg/analysis_server/lib/src/status/get_handler2.dart
deleted file mode 100644
index 8b1dca3f007fd314909c893e062b540ae6c88205..0000000000000000000000000000000000000000
--- a/pkg/analysis_server/lib/src/status/get_handler2.dart
+++ /dev/null
@@ -1,1321 +0,0 @@
-// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
-// for details. All rights reserved. Use of this source code is governed by a
-// BSD-style license that can be found in the LICENSE file.
-
-import 'dart:convert';
-import 'dart:io';
-import 'dart:math';
-
-import 'package:analysis_server/protocol/protocol.dart';
-import 'package:analysis_server/protocol/protocol_generated.dart'
-    hide AnalysisOptions;
-import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analysis_server/src/domain_completion.dart';
-import 'package:analysis_server/src/domain_diagnostic.dart';
-import 'package:analysis_server/src/domain_execution.dart';
-import 'package:analysis_server/src/plugin/plugin_manager.dart';
-import 'package:analysis_server/src/server/http_server.dart';
-import 'package:analysis_server/src/services/completion/completion_performance.dart';
-import 'package:analysis_server/src/socket_server.dart';
-import 'package:analyzer/exception/exception.dart';
-import 'package:analyzer/file_system/file_system.dart';
-import 'package:analyzer/instrumentation/instrumentation.dart';
-import 'package:analyzer/source/error_processor.dart';
-import 'package:analyzer/source/package_map_resolver.dart';
-import 'package:analyzer/source/sdk_ext.dart';
-import 'package:analyzer/src/context/source.dart';
-import 'package:analyzer/src/dart/analysis/driver.dart';
-import 'package:analyzer/src/dart/sdk/sdk.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/sdk.dart';
-import 'package:analyzer/src/generated/source.dart';
-import 'package:analyzer/src/generated/utilities_general.dart';
-import 'package:analyzer/src/services/lint.dart';
-import 'package:analyzer/task/model.dart';
-import 'package:path/path.dart' as path;
-import 'package:plugin/plugin.dart';
-
-String _writeWithSeparators(int value) {
-  // TODO(devoncarew): Replace with the implementation from package:intl.
-  String str = value.toString();
-  int pos = 3;
-  while (str.length > pos) {
-    int len = str.length;
-    str = '${str.substring(0, len - pos)},${str.substring(len - pos)}';
-    pos += 4;
-  }
-  return str;
-}
-
-/**
- * A function that can be used to generate HTML output into the given [buffer].
- * The HTML that is generated must be valid (special characters must already be
- * encoded).
- */
-typedef void HtmlGenerator(StringBuffer buffer);
-
-/**
- * Instances of the class [GetHandler2] handle GET requests.
- */
-class GetHandler2 implements AbstractGetHandler {
-  /**
-   * The path used to request overall performance information.
-   */
-  static const String ANALYSIS_PERFORMANCE_PATH = '/perf/analysis';
-
-  /**
-   * The path used to request code completion information.
-   */
-  static const String COMPLETION_PATH = '/completion';
-
-  /**
-   * The path used to request communication performance information.
-   */
-  static const String COMMUNICATION_PERFORMANCE_PATH = '/perf/communication';
-
-  /**
-   * The path used to request information about a specific context.
-   */
-  static const String CONTEXT_PATH = '/context';
-
-  /**
-   * The path used to request an overlay contents.
-   */
-  static const String OVERLAY_PATH = '/overlay';
-
-  /**
-   * The path used to request overlays information.
-   */
-  static const String OVERLAYS_PATH = '/overlays';
-
-  /**
-   * The path used to request the status of the analysis server as a whole.
-   */
-  static const String STATUS_PATH = '/status';
-
-  /**
-   * Query parameter used to represent the context to search for.
-   */
-  static const String CONTEXT_QUERY_PARAM = 'context';
-
-  /**
-   * Query parameter used to represent the path of an overlayed file.
-   */
-  static const String PATH_PARAM = 'path';
-
-  static final ContentType _htmlContent =
-      new ContentType("text", "html", charset: "utf-8");
-
-  /**
-   * The socket server whose status is to be reported on.
-   */
-  SocketServer _server;
-
-  /**
-   * Buffer containing strings printed by the analysis server.
-   */
-  List<String> _printBuffer;
-
-  /**
-   * Contents of overlay files.
-   */
-  final Map<String, String> _overlayContents = <String, String>{};
-
-  /**
-   * Handler for diagnostics requests.
-   */
-  DiagnosticDomainHandler _diagnosticHandler;
-
-  /**
-   * Initialize a newly created handler for GET requests.
-   */
-  GetHandler2(this._server, this._printBuffer);
-
-  DiagnosticDomainHandler get diagnosticHandler {
-    if (_diagnosticHandler == null) {
-      _diagnosticHandler = new DiagnosticDomainHandler(_server.analysisServer);
-    }
-    return _diagnosticHandler;
-  }
-
-  /**
-   * Return the active [CompletionDomainHandler]
-   * or `null` if either analysis server is not running
-   * or there is no completion domain handler.
-   */
-  CompletionDomainHandler get _completionDomainHandler {
-    AnalysisServer analysisServer = _server.analysisServer;
-    if (analysisServer == null) {
-      return null;
-    }
-    return analysisServer.handlers
-        .firstWhere((h) => h is CompletionDomainHandler, orElse: () => null);
-  }
-
-  /**
-   * Handle a GET request received by the HTTP server.
-   */
-  void handleGetRequest(HttpRequest request) {
-    String path = request.uri.path;
-    if (path == '/') {
-      _returnRedirect(request, STATUS_PATH);
-    } else if (path == STATUS_PATH) {
-      _returnServerStatus(request);
-    } else if (path == ANALYSIS_PERFORMANCE_PATH) {
-      _returnAnalysisPerformance(request);
-    } else if (path == COMPLETION_PATH) {
-      _returnCompletionInfo(request);
-    } else if (path == COMMUNICATION_PERFORMANCE_PATH) {
-      _returnCommunicationPerformance(request);
-    } else if (path == CONTEXT_PATH) {
-      _returnContextInfo(request);
-    } else if (path == OVERLAY_PATH) {
-      _returnOverlayContents(request);
-    } else if (path == OVERLAYS_PATH) {
-      _returnOverlaysInfo(request);
-    } else {
-      _returnUnknownRequest(request);
-    }
-  }
-
-  /**
-   * Return the folder being managed by the given [analysisServer] that matches
-   * the given [contextFilter], or `null` if there is none.
-   */
-  Folder _findFolder(AnalysisServer analysisServer, String contextFilter) {
-    return analysisServer.driverMap.keys.firstWhere(
-        (Folder folder) => folder.path == contextFilter,
-        orElse: () => null);
-  }
-
-  /**
-   * Return `true` if the given analysis [driver] has at least one entry with
-   * an exception.
-   */
-  bool _hasException(AnalysisDriver driver) {
-//    if (driver == null) {
-//      return false;
-//    }
-//    MapIterator<AnalysisTarget, CacheEntry> iterator =
-//        context.analysisCache.iterator();
-//    while (iterator.moveNext()) {
-//      CacheEntry entry = iterator.value;
-//      if (entry == null || entry.exception != null) {
-//        return true;
-//      }
-//    }
-    // TODO(scheglov)
-    return false;
-  }
-
-  /**
-   * Return a response displaying overall performance information.
-   */
-  void _returnAnalysisPerformance(HttpRequest request) {
-    AnalysisServer analysisServer = _server.analysisServer;
-    if (analysisServer == null) {
-      return _returnFailure(request, 'Analysis server is not running');
-    }
-    _writeResponse(request, (StringBuffer buffer) {
-      _writePage(buffer, 'Analysis Performance', [], (StringBuffer buffer) {
-        buffer.write('<h3>Analysis Performance</h3>');
-        _writeTwoColumns(buffer, (StringBuffer buffer) {
-          //
-          // Write performance tags.
-          //
-          buffer.write('<p><b>Performance tag data</b></p>');
-          buffer.write(
-              '<table style="border-collapse: separate; border-spacing: 10px 5px;">');
-          _writeRow(buffer, ['Time (in ms)', 'Percent', 'Tag name'],
-              header: true);
-          // prepare sorted tags
-          List<PerformanceTag> tags = PerformanceTag.all.toList();
-          tags.remove(ServerPerformanceStatistics.idle);
-          tags.sort((a, b) => b.elapsedMs - a.elapsedMs);
-          // prepare total time
-          int totalTagTime = 0;
-          tags.forEach((PerformanceTag tag) {
-            totalTagTime += tag.elapsedMs;
-          });
-          // write rows
-          void writeRow(PerformanceTag tag) {
-            double percent = (tag.elapsedMs * 100) / totalTagTime;
-            String percentStr = '${percent.toStringAsFixed(2)}%';
-            _writeRow(buffer, [tag.elapsedMs, percentStr, tag.label],
-                classes: ["right", "right", null]);
-          }
-
-          tags.forEach(writeRow);
-          buffer.write('</table>');
-        }, (StringBuffer buffer) {
-          //
-          // Write task model timing information.
-          //
-          buffer.write('<p><b>Task performance data</b></p>');
-          buffer.write(
-              '<table style="border-collapse: separate; border-spacing: 10px 5px;">');
-          _writeRow(
-              buffer,
-              [
-                'Task Name',
-                'Count',
-                'Total Time (in ms)',
-                'Average Time (in ms)'
-              ],
-              header: true);
-
-          Map<Type, int> countMap = AnalysisTask.countMap;
-          Map<Type, Stopwatch> stopwatchMap = AnalysisTask.stopwatchMap;
-          List<Type> taskClasses = stopwatchMap.keys.toList();
-          taskClasses.sort((Type first, Type second) =>
-              first.toString().compareTo(second.toString()));
-          int totalTaskTime = 0;
-          taskClasses.forEach((Type taskClass) {
-            int count = countMap[taskClass];
-            if (count == null) {
-              count = 0;
-            }
-            int taskTime = stopwatchMap[taskClass].elapsedMilliseconds;
-            totalTaskTime += taskTime;
-            _writeRow(buffer, [
-              taskClass.toString(),
-              count,
-              taskTime,
-              count <= 0 ? '-' : (taskTime / count).toStringAsFixed(3)
-            ], classes: [
-              null,
-              "right",
-              "right",
-              "right"
-            ]);
-          });
-          _writeRow(buffer, ['Total', '-', totalTaskTime, '-'],
-              classes: [null, "right", "right", "right"]);
-          buffer.write('</table>');
-        });
-      });
-    });
-  }
-
-  /**
-   * Return a response displaying overall performance information.
-   */
-  void _returnCommunicationPerformance(HttpRequest request) {
-    AnalysisServer analysisServer = _server.analysisServer;
-    if (analysisServer == null) {
-      return _returnFailure(request, 'Analysis server is not running');
-    }
-    _writeResponse(request, (StringBuffer buffer) {
-      _writePage(buffer, 'Communication Performance', [],
-          (StringBuffer buffer) {
-        buffer.write('<h3>Communication Performance</h3>');
-        _writeTwoColumns(buffer, (StringBuffer buffer) {
-          ServerPerformance perf = analysisServer.performanceDuringStartup;
-          int requestCount = perf.requestCount;
-          num averageLatency = requestCount > 0
-              ? (perf.requestLatency / requestCount).round()
-              : 0;
-          int maximumLatency = perf.maxLatency;
-          num slowRequestPercent = requestCount > 0
-              ? (perf.slowRequestCount * 100 / requestCount).round()
-              : 0;
-          buffer.write('<h4>Startup</h4>');
-          buffer.write('<table>');
-          _writeRow(buffer, [requestCount, 'requests'],
-              classes: ["right", null]);
-          _writeRow(buffer, [averageLatency, 'ms average latency'],
-              classes: ["right", null]);
-          _writeRow(buffer, [maximumLatency, 'ms maximum latency'],
-              classes: ["right", null]);
-          _writeRow(buffer, [slowRequestPercent, '% > 150 ms latency'],
-              classes: ["right", null]);
-          if (analysisServer.performanceAfterStartup != null) {
-            int startupTime = analysisServer.performanceAfterStartup.startTime -
-                perf.startTime;
-            _writeRow(
-                buffer, [startupTime, 'ms for initial analysis to complete']);
-          }
-          buffer.write('</table>');
-        }, (StringBuffer buffer) {
-          ServerPerformance perf = analysisServer.performanceAfterStartup;
-          if (perf == null) {
-            return;
-          }
-          int requestCount = perf.requestCount;
-          num averageLatency = requestCount > 0
-              ? (perf.requestLatency * 10 / requestCount).round() / 10
-              : 0;
-          int maximumLatency = perf.maxLatency;
-          num slowRequestPercent = requestCount > 0
-              ? (perf.slowRequestCount * 100 / requestCount).round()
-              : 0;
-          buffer.write('<h4>Current</h4>');
-          buffer.write('<table>');
-          _writeRow(buffer, [requestCount, 'requests'],
-              classes: ["right", null]);
-          _writeRow(buffer, [averageLatency, 'ms average latency'],
-              classes: ["right", null]);
-          _writeRow(buffer, [maximumLatency, 'ms maximum latency'],
-              classes: ["right", null]);
-          _writeRow(buffer, [slowRequestPercent, '% > 150 ms latency'],
-              classes: ["right", null]);
-          buffer.write('</table>');
-        });
-      });
-    });
-  }
-
-  /**
-   * Return a response displaying code completion information.
-   */
-  void _returnCompletionInfo(HttpRequest request) {
-    String value = request.requestedUri.queryParameters['index'];
-    int index = value != null ? int.parse(value, onError: (_) => 0) : 0;
-    _writeResponse(request, (StringBuffer buffer) {
-      _writePage(buffer, 'Completion Stats', [], (StringBuffer buffer) {
-        _writeCompletionPerformanceDetail(buffer, index);
-        _writeCompletionPerformanceList(buffer);
-      });
-    });
-  }
-
-  /**
-   * Return a response containing information about a single source file in the
-   * cache.
-   */
-  void _returnContextInfo(HttpRequest request) {
-    AnalysisServer analysisServer = _server.analysisServer;
-    if (analysisServer == null) {
-      return _returnFailure(request, 'Analysis server not running');
-    }
-    String contextFilter = request.uri.queryParameters[CONTEXT_QUERY_PARAM];
-    if (contextFilter == null) {
-      return _returnFailure(
-          request, 'Query parameter $CONTEXT_QUERY_PARAM required');
-    }
-    AnalysisDriver driver = null;
-    Folder folder = _findFolder(analysisServer, contextFilter);
-    if (folder == null) {
-      return _returnFailure(request, 'Invalid context: $contextFilter');
-    } else {
-      driver = analysisServer.driverMap[folder];
-    }
-
-    List<String> priorityFiles = driver.priorityFiles;
-    List<String> addedFiles = driver.addedFiles.toList();
-    List<String> implicitFiles =
-        driver.knownFiles.difference(driver.addedFiles).toList();
-    addedFiles.sort();
-    implicitFiles.sort();
-
-    // TODO(scheglov) Use file overlays.
-//    _overlayContents.clear();
-//    context.visitContentCache((String fullName, int stamp, String contents) {
-//      _overlayContents[fullName] = contents;
-//    });
-
-    void _writeFiles(StringBuffer buffer, String title, List<String> files) {
-      buffer.write('<h3>$title</h3>');
-      if (files == null || files.isEmpty) {
-        buffer.write('<p>None</p>');
-      } else {
-        buffer.write('<p><table style="width: 100%">');
-        for (String file in files) {
-          buffer.write('<tr><td>');
-          buffer.write(file);
-          buffer.write('</td><td>');
-          if (_overlayContents.containsKey(files)) {
-            buffer.write(makeLink(OVERLAY_PATH, {PATH_PARAM: file}, 'overlay'));
-          }
-          buffer.write('</td></tr>');
-        }
-        buffer.write('</table></p>');
-      }
-    }
-
-    void writeOptions(StringBuffer buffer, AnalysisOptionsImpl options,
-        {void writeAdditionalOptions(StringBuffer buffer)}) {
-      if (options == null) {
-        buffer.write('<p>No option information available.</p>');
-        return;
-      }
-      buffer.write('<p>');
-      _writeOption(
-          buffer, 'Analyze functon bodies', options.analyzeFunctionBodies);
-      _writeOption(buffer, 'Enable asserts in initializer lists',
-          options.enableAssertInitializer);
-      _writeOption(
-          buffer, 'Enable strict call checks', options.enableStrictCallChecks);
-      _writeOption(buffer, 'Enable super mixins', options.enableSuperMixins);
-      _writeOption(buffer, 'Generate dart2js hints', options.dart2jsHint);
-      _writeOption(buffer, 'Generate errors in implicit files',
-          options.generateImplicitErrors);
-      _writeOption(
-          buffer, 'Generate errors in SDK files', options.generateSdkErrors);
-      _writeOption(buffer, 'Generate hints', options.hint);
-      _writeOption(buffer, 'Incremental resolution', options.incremental);
-      _writeOption(buffer, 'Incremental resolution with API changes',
-          options.incrementalApi);
-      _writeOption(buffer, 'Preserve comments', options.preserveComments);
-      _writeOption(buffer, 'Strong mode', options.strongMode);
-      _writeOption(buffer, 'Strong mode hints', options.strongModeHints);
-      if (writeAdditionalOptions != null) {
-        writeAdditionalOptions(buffer);
-      }
-      buffer.write('</p>');
-    }
-
-    _writeResponse(request, (StringBuffer buffer) {
-      String contextName = path.basename(contextFilter);
-      _writePage(buffer, 'Context: $contextName', [contextFilter],
-          (StringBuffer buffer) {
-        buffer.write('<h3>Configuration</h3>');
-
-        AnalysisOptions analysisOptions = driver.analysisOptions;
-
-        _writeColumns(buffer, <HtmlGenerator>[
-          (StringBuffer buffer) {
-            buffer.write('<p><b>Context Options</b></p>');
-            writeOptions(buffer, analysisOptions);
-          },
-          (StringBuffer buffer) {
-            buffer.write('<p><b>SDK Context Options</b></p>');
-            DartSdk sdk = driver?.sourceFactory?.dartSdk;
-            writeOptions(buffer, sdk?.context?.analysisOptions,
-                writeAdditionalOptions: (StringBuffer buffer) {
-              if (sdk is FolderBasedDartSdk) {
-                _writeOption(buffer, 'Use summaries', sdk.useSummary);
-              }
-            });
-          },
-          (StringBuffer buffer) {
-            List<Linter> lints = analysisOptions.lintRules;
-            buffer.write('<p><b>Lints</b></p>');
-            if (lints.isEmpty) {
-              buffer.write('<p>none</p>');
-            } else {
-              for (Linter lint in lints) {
-                buffer.write('<p>');
-                buffer.write(lint.runtimeType);
-                buffer.write('</p>');
-              }
-            }
-
-            List<ErrorProcessor> errorProcessors =
-                analysisOptions.errorProcessors;
-            int processorCount = errorProcessors?.length ?? 0;
-            buffer
-                .write('<p><b>Error Processor count</b>: $processorCount</p>');
-          }
-        ]);
-
-        _writeColumns(buffer, <HtmlGenerator>[
-          (StringBuffer buffer) {
-            buffer.write('<p><b>analysis_options path</b></p>');
-
-            if (driver.contextRoot.optionsFilePath != null) {
-              buffer.write(
-                  '<p>${HTML_ESCAPE.convert(driver.contextRoot.optionsFilePath)}</p>');
-            } else {
-              buffer.write('<p>none</p>');
-            }
-          }
-        ]);
-
-        SourceFactory sourceFactory = driver.sourceFactory;
-        if (sourceFactory is SourceFactoryImpl) {
-          buffer.write('<h3>Resolvers</h3>');
-          for (UriResolver resolver in sourceFactory.resolvers) {
-            buffer.write('<p>');
-            buffer.write(resolver.runtimeType);
-            if (resolver is DartUriResolver) {
-              DartSdk sdk = resolver.dartSdk;
-              buffer.write(' (sdk = ');
-              buffer.write(sdk.runtimeType);
-              if (sdk is FolderBasedDartSdk) {
-                buffer.write(' (path = ');
-                buffer.write(sdk.directory.path);
-                buffer.write(')');
-              } else if (sdk is EmbedderSdk) {
-                buffer.write(' (map = ');
-                _writeMap(buffer, sdk.urlMappings);
-                buffer.write(')');
-              }
-              buffer.write(')');
-            } else if (resolver is SdkExtUriResolver) {
-              buffer.write(' (map = ');
-              _writeMap(buffer, resolver.urlMappings);
-              buffer.write(')');
-            } else if (resolver is PackageMapUriResolver) {
-              _writeMap(buffer, resolver.packageMap, valueWriter: _writeList);
-            }
-            buffer.write('</p>');
-          }
-        }
-
-        _writeFiles(
-            buffer, 'Priority Files (${priorityFiles.length})', priorityFiles);
-        _writeFiles(buffer, 'Added Files (${addedFiles.length})', addedFiles);
-        _writeFiles(
-            buffer,
-            'Implicitly Analyzed Files (${implicitFiles.length})',
-            implicitFiles);
-
-        // TODO(scheglov) Show exceptions.
-//        buffer.write('<h3>Exceptions</h3>');
-//        if (exceptions.isEmpty) {
-//          buffer.write('<p>none</p>');
-//        } else {
-//          exceptions.forEach((CaughtException exception) {
-//            _writeException(buffer, exception);
-//          });
-//        }
-      });
-    });
-  }
-
-  void _returnFailure(HttpRequest request, String message) {
-    _writeResponse(request, (StringBuffer buffer) {
-      _writePage(buffer, 'Failure', [], (StringBuffer buffer) {
-        buffer.write(HTML_ESCAPE.convert(message));
-      });
-    });
-  }
-
-  void _returnOverlayContents(HttpRequest request) {
-    String path = request.requestedUri.queryParameters[PATH_PARAM];
-    if (path == null) {
-      return _returnFailure(request, 'Query parameter $PATH_PARAM required');
-    }
-    String contents = _overlayContents[path];
-
-    _writeResponse(request, (StringBuffer buffer) {
-      _writePage(buffer, 'Overlay', [], (StringBuffer buffer) {
-        buffer.write('<pre>${HTML_ESCAPE.convert(contents)}</pre>');
-      });
-    });
-  }
-
-  /**
-   * Return a response displaying overlays information.
-   */
-  void _returnOverlaysInfo(HttpRequest request) {
-    AnalysisServer analysisServer = _server.analysisServer;
-    if (analysisServer == null) {
-      return _returnFailure(request, 'Analysis server is not running');
-    }
-
-    _writeResponse(request, (StringBuffer buffer) {
-      _writePage(buffer, 'Overlay information', [], (StringBuffer buffer) {
-        buffer.write('<table border="1">');
-        _overlayContents.clear();
-        ContentCache overlayState = analysisServer.overlayState;
-        overlayState.accept((String fullName, int stamp, String contents) {
-          buffer.write('<tr>');
-          String link =
-              makeLink(OVERLAY_PATH, {PATH_PARAM: fullName}, fullName);
-          DateTime time = new DateTime.fromMillisecondsSinceEpoch(stamp);
-          _writeRow(buffer, [link, time]);
-          _overlayContents[fullName] = contents;
-        });
-        int count = _overlayContents.length;
-        buffer.write('<tr><td colspan="2">Total: $count entries</td></tr>');
-        buffer.write('</table>');
-      });
-    });
-  }
-
-  void _returnRedirect(HttpRequest request, String pathFragment) {
-    HttpResponse response = request.response;
-    response.redirect(request.uri.resolve(pathFragment));
-  }
-
-  /**
-   * Return a response indicating the status of the analysis server.
-   */
-  void _returnServerStatus(HttpRequest request) {
-    _writeResponse(request, (StringBuffer buffer) {
-      _writePage(buffer, 'Status', [], (StringBuffer buffer) {
-        if (_writeServerStatus(buffer)) {
-          _writeAnalysisStatus(buffer);
-          _writeEditStatus(buffer);
-          _writeExecutionStatus(buffer);
-          _writePluginStatus(buffer);
-          _writeRecentOutput(buffer);
-        }
-      });
-    });
-  }
-
-  /**
-   * Return an error in response to an unrecognized request received by the HTTP
-   * server.
-   */
-  void _returnUnknownRequest(HttpRequest request) {
-    _writeResponse(request, (StringBuffer buffer) {
-      _writePage(buffer, 'Analysis Server', [], (StringBuffer buffer) {
-        buffer.write('<h3>Unknown page: ');
-        buffer.write(request.uri.path);
-        buffer.write('</h3>');
-        buffer.write('''
-        <p>
-        You have reached an un-recognized page. If you reached this page by
-        following a link from a status page, please report the broken link to
-        the Dart analyzer team:
-        <a>https://github.com/dart-lang/sdk/issues/new</a>.
-        </p><p>
-        If you mistyped the URL, you can correct it or return to
-        ${makeLink(STATUS_PATH, {}, 'the main status page')}.
-        </p>''');
-      });
-    });
-  }
-
-  /**
-   * Return a two digit decimal representation of the given non-negative integer
-   * [value].
-   */
-  String _twoDigit(int value) => value.toString().padLeft(2, '0');
-
-  /**
-   * Write the status of the analysis domain (on the main status page) to the
-   * given [buffer] object.
-   */
-  void _writeAnalysisStatus(StringBuffer buffer) {
-    AnalysisServer analysisServer = _server.analysisServer;
-    Map<Folder, AnalysisDriver> driverMap = analysisServer.driverMap;
-    List<Folder> folders = driverMap.keys.toList();
-    folders.sort((Folder first, Folder second) =>
-        first.shortName.compareTo(second.shortName));
-
-    buffer.write('<h3>Analysis Domain</h3>');
-    _writeTwoColumns(buffer, (StringBuffer buffer) {
-      buffer.write('<p>Using package resolver provider: ');
-      buffer.write(_server.packageResolverProvider != null);
-      buffer.write('</p>');
-      buffer.write(makeLink(OVERLAYS_PATH, {}, 'Overlay information'));
-
-      buffer.write('<p><b>Analysis Contexts</b></p>');
-      bool first = true;
-      folders.forEach((Folder folder) {
-        if (first) {
-          first = false;
-        } else {
-          buffer.write('<br>');
-        }
-        String key = folder.shortName;
-        buffer.write(makeLink(CONTEXT_PATH, {CONTEXT_QUERY_PARAM: folder.path},
-            key, _hasException(driverMap[folder])));
-        if (!folder.getChild('.packages').exists) {
-          buffer.write(' [no .packages file]');
-        }
-      });
-
-      int freq = AnalysisServer.performOperationDelayFrequency;
-      String delay = freq > 0 ? '1 ms every $freq ms' : 'off';
-
-      buffer.write('<p><b>Performance Data</b></p>');
-      buffer.write(
-          makeLink(ANALYSIS_PERFORMANCE_PATH, {}, 'Analysis performance'));
-      buffer.write('<br>');
-      buffer.write('Perform operation delay: $delay');
-      buffer.write('<br>');
-    }, (StringBuffer buffer) {
-      _writeSubscriptionMap(
-          buffer, AnalysisService.VALUES, analysisServer.analysisServices);
-    });
-  }
-
-  /**
-   * Write multiple columns of information to the given [buffer], where the list
-   * of [columns] functions are used to generate the content of those columns.
-   */
-  void _writeColumns(StringBuffer buffer, List<HtmlGenerator> columns) {
-    buffer
-        .write('<table class="column"><tr class="column"><td class="column">');
-    int count = columns.length;
-    for (int i = 0; i < count; i++) {
-      if (i > 0) {
-        buffer.write('</td><td class="column">');
-      }
-      columns[i](buffer);
-    }
-    buffer.write('</td></tr></table>');
-  }
-
-  /**
-   * Write performance information about a specific completion request
-   * to the given [buffer] object.
-   */
-  void _writeCompletionPerformanceDetail(StringBuffer buffer, int index) {
-    CompletionDomainHandler handler = _completionDomainHandler;
-    CompletionPerformance performance;
-    if (handler != null) {
-      List<CompletionPerformance> list = handler.performanceList;
-      if (list != null && list.isNotEmpty) {
-        performance = list[max(0, min(list.length - 1, index))];
-      }
-    }
-    if (performance == null) {
-      buffer.write('<h3>Completion Performance Detail</h3>');
-      buffer.write('<p>No completions yet</p>');
-      return;
-    }
-    buffer.write('<h3>Completion Performance Detail</h3>');
-    buffer.write('<p>${performance.startTimeAndMs} for ${performance.source}');
-    buffer.write('<table>');
-    _writeRow(buffer, ['Elapsed', '', 'Operation'], header: true);
-    performance.operations.forEach((OperationPerformance op) {
-      String elapsed = op.elapsed != null ? op.elapsed.toString() : '???';
-      _writeRow(buffer, [elapsed, '&nbsp;&nbsp;', op.name]);
-    });
-    buffer.write('</table>');
-    buffer.write('<p><b>Compute Cache Performance</b>: ');
-    if (handler.computeCachePerformance == null) {
-      buffer.write('none');
-    } else {
-      int elapsed = handler.computeCachePerformance.elapsedInMilliseconds;
-      Source source = handler.computeCachePerformance.source;
-      buffer.write(' $elapsed ms for $source');
-    }
-    buffer.write('</p>');
-  }
-
-  /**
-   * Write a table showing summary information for the last several
-   * completion requests to the given [buffer] object.
-   */
-  void _writeCompletionPerformanceList(StringBuffer buffer) {
-    CompletionDomainHandler handler = _completionDomainHandler;
-    buffer.write('<h3>Completion Performance List</h3>');
-    if (handler == null) {
-      return;
-    }
-    buffer.write('<table>');
-    _writeRow(
-        buffer,
-        [
-          'Start Time',
-          '',
-          'First (ms)',
-          '',
-          'Complete (ms)',
-          '',
-          '# Notifications',
-          '',
-          '# Suggestions',
-          '',
-          'Snippet'
-        ],
-        header: true);
-    int index = 0;
-    for (CompletionPerformance performance in handler.performanceList) {
-      String link = makeLink(COMPLETION_PATH, {'index': '$index'},
-          '${performance.startTimeAndMs}');
-      _writeRow(buffer, [
-        link,
-        '&nbsp;&nbsp;',
-        performance.firstNotificationInMilliseconds,
-        '&nbsp;&nbsp;',
-        performance.elapsedInMilliseconds,
-        '&nbsp;&nbsp;',
-        performance.notificationCount,
-        '&nbsp;&nbsp;',
-        performance.suggestionCount,
-        '&nbsp;&nbsp;',
-        HTML_ESCAPE.convert(performance.snippet)
-      ]);
-      ++index;
-    }
-
-    buffer.write('</table>');
-    buffer.write('''
-      <p><strong>First (ms)</strong> - the number of milliseconds
-        from when completion received the request until the first notification
-        with completion results was queued for sending back to the client.
-      <p><strong>Complete (ms)</strong> - the number of milliseconds
-        from when completion received the request until the final notification
-        with completion results was queued for sending back to the client.
-      <p><strong># Notifications</strong> - the total number of notifications
-        sent to the client with completion results for this request.
-      <p><strong># Suggestions</strong> - the number of suggestions
-        sent to the client in the first notification, followed by a comma,
-        followed by the number of suggestions send to the client
-        in the last notification. If there is only one notification,
-        then there will be only one number in this column.''');
-  }
-
-  /**
-   * Write the status of the edit domain (on the main status page) to the given
-   * [buffer].
-   */
-  void _writeEditStatus(StringBuffer buffer) {
-    buffer.write('<h3>Edit Domain</h3>');
-    _writeTwoColumns(buffer, (StringBuffer buffer) {
-      buffer.write(makeLink(COMPLETION_PATH, {}, 'Completion stats'));
-    }, (StringBuffer buffer) {});
-  }
-
-  /**
-   * Write a representation of the given [caughtException] to the given
-   * [buffer]. If [isCause] is `true`, then the exception was a cause for
-   * another exception.
-   */
-  void _writeException(StringBuffer buffer, CaughtException caughtException,
-      {bool isCause: false}) {
-    Object exception = caughtException.exception;
-
-    if (exception is AnalysisException) {
-      buffer.write('<p>');
-      if (isCause) {
-        buffer.write('Caused by ');
-      }
-      buffer.write(exception.message);
-      buffer.write('</p>');
-      _writeStackTrace(buffer, caughtException.stackTrace);
-      CaughtException cause = exception.cause;
-      if (cause != null) {
-        buffer.write('<blockquote>');
-        _writeException(buffer, cause, isCause: true);
-        buffer.write('</blockquote>');
-      }
-    } else {
-      buffer.write('<p>');
-      if (isCause) {
-        buffer.write('Caused by ');
-      }
-      buffer.write(exception.toString());
-      buffer.write('<p>');
-      _writeStackTrace(buffer, caughtException.stackTrace);
-    }
-  }
-
-  /**
-   * Write the status of the execution domain (on the main status page) to the
-   * given [buffer].
-   */
-  void _writeExecutionStatus(StringBuffer buffer) {
-    AnalysisServer analysisServer = _server.analysisServer;
-    ExecutionDomainHandler handler = analysisServer.handlers.firstWhere(
-        (RequestHandler handler) => handler is ExecutionDomainHandler,
-        orElse: () => null);
-    Set<ExecutionService> services = new Set<ExecutionService>();
-    if (handler.onFileAnalyzed != null) {
-      services.add(ExecutionService.LAUNCH_DATA);
-    }
-
-    if (handler != null) {
-      buffer.write('<h3>Execution Domain</h3>');
-      _writeTwoColumns(buffer, (StringBuffer buffer) {
-        buffer.write('<br>');
-      }, (StringBuffer buffer) {
-        _writeSubscriptionList(buffer, ExecutionService.VALUES, services);
-      });
-    }
-  }
-
-  /**
-   * Write to the given [buffer] a representation of the given [list].
-   */
-  void _writeList<E>(StringBuffer buffer, List<E> list,
-      {void elementWriter(StringBuffer buffer, E element)}) {
-    buffer.write('[');
-    for (int i = 0; i < list.length; i++) {
-      if (i > 0) {
-        buffer.write(', ');
-      }
-      if (elementWriter == null) {
-        buffer.write(list[i]);
-      } else {
-        elementWriter(buffer, list[i]);
-      }
-    }
-    buffer.write(']');
-  }
-
-  /**
-   * Write to the given [buffer] a representation of the given [map].
-   */
-  void _writeMap<V>(StringBuffer buffer, Map<String, V> map,
-      {void valueWriter(StringBuffer buffer, V value)}) {
-    List<String> keys = map.keys.toList();
-    keys.sort();
-    int length = keys.length;
-    buffer.write('{');
-    for (int i = 0; i < length; i++) {
-      buffer.write('<br>');
-      String key = keys[i];
-      V value = map[key];
-      if (i > 0) {
-        buffer.write(', ');
-      }
-      buffer.write(key);
-      buffer.write(' = ');
-      if (valueWriter == null) {
-        buffer.write(value);
-      } else {
-        valueWriter(buffer, value);
-      }
-    }
-    buffer.write('<br>}');
-  }
-
-  /**
-   * Write a representation of an analysis option with the given [name] and
-   * [value] to the given [buffer]. The option should be separated from other
-   * options unless the [last] flag is true, indicating that this is the last
-   * option in the list of options.
-   */
-  void _writeOption(StringBuffer buffer, String name, Object value,
-      {bool last: false}) {
-    buffer.write(name);
-    buffer.write(' = ');
-    buffer.write(value.toString());
-    if (!last) {
-      buffer.write('<br>');
-    }
-  }
-
-  /**
-   * Write a standard HTML page to the given [buffer]. The page will have the
-   * given [title] and a body that is generated by the given [body] generator.
-   */
-  void _writePage(StringBuffer buffer, String title, List<String> subtitles,
-      HtmlGenerator body) {
-    DateTime now = new DateTime.now();
-    String date = "${now.month}/${now.day}/${now.year}";
-    String time =
-        "${now.hour}:${_twoDigit(now.minute)}:${_twoDigit(now.second)}.${now.millisecond}";
-
-    buffer.write('<!DOCTYPE html>');
-    buffer.write('<html>');
-    buffer.write('<head>');
-    buffer.write('<meta charset="utf-8">');
-    buffer.write(
-        '<meta name="viewport" content="width=device-width, initial-scale=1.0">');
-    buffer.write('<title>Analysis Server</title>');
-    buffer.write('<style>');
-    buffer.write('a {color: #0000DD; text-decoration: none;}');
-    buffer.write('a:link.error {background-color: #FFEEEE;}');
-    buffer.write('a:visited.error {background-color: #FFEEEE;}');
-    buffer.write('a:hover.error {background-color: #FFEEEE;}');
-    buffer.write('a:active.error {background-color: #FFEEEE;}');
-    buffer.write(
-        'div.subtitle {float: right; font-weight: normal; font-size: 1rem;}');
-    buffer.write('h2 {margin-top: 0;}');
-    buffer.write('h3 {border-bottom: 1px #DDD solid; margin-bottom: 0em;}');
-    buffer.write('p {margin-top: 0.5em; margin-bottom: 0;}');
-    buffer.write(
-        'p.commentary {margin-top: 1em; margin-bottom: 1em; margin-left: 2em; font-style: italic;}');
-//    response.write('span.error {text-decoration-line: underline; text-decoration-color: red; text-decoration-style: wavy;}');
-    buffer.write(
-        'table.column {border: 0px solid black; width: 100%; table-layout: fixed;}');
-    buffer.write('td.column {vertical-align: top; width: 50%;}');
-    buffer.write('td.right {text-align: right;}');
-    buffer.write('th {text-align: left; vertical-align:top;}');
-    buffer.write('tr {vertical-align:top;}');
-    buffer.write('</style>');
-    buffer.write('</head>');
-
-    buffer.write('<body>');
-    buffer.write('<h2>$title <div class="subtitle">$date, $time</div></h2>');
-    if (subtitles != null && subtitles.isNotEmpty) {
-      bool first = true;
-      for (String subtitle in subtitles) {
-        if (first) {
-          first = false;
-        } else {
-          buffer.write('<br>');
-        }
-        buffer.write('<b>');
-        buffer.write(subtitle);
-        buffer.write('</b>');
-      }
-    }
-    try {
-      body(buffer);
-    } catch (exception, stackTrace) {
-      buffer.write('<h3>Exception while creating page</h3>');
-      _writeException(buffer, new CaughtException(exception, stackTrace));
-    }
-    buffer.write('</body>');
-    buffer.write('</html>');
-  }
-
-  /**
-   * Write the recent output section (on the main status page) to the given
-   * [buffer] object.
-   */
-  void _writePluginStatus(StringBuffer buffer) {
-    void writePlugin(Plugin plugin) {
-      buffer.write(plugin.uniqueIdentifier);
-      buffer.write(' (');
-      buffer.write(plugin.runtimeType);
-      buffer.write(')<br>');
-    }
-
-    buffer.write('<h3>Plugin Status</h3><p>');
-    writePlugin(AnalysisEngine.instance.enginePlugin);
-    writePlugin(_server.serverPlugin);
-    for (Plugin plugin in _server.analysisServer.userDefinedPlugins) {
-      writePlugin(plugin);
-    }
-    buffer.write('<p>');
-  }
-
-  /**
-   * Write the recent output section (on the main status page) to the given
-   * [buffer] object.
-   */
-  void _writeRecentOutput(StringBuffer buffer) {
-    buffer.write('<h3>Recent Output</h3>');
-    String output = HTML_ESCAPE.convert(_printBuffer.join('\n'));
-    if (output.isEmpty) {
-      buffer.write('<i>none</i>');
-    } else {
-      buffer.write('<pre>');
-      buffer.write(output);
-      buffer.write('</pre>');
-    }
-  }
-
-  void _writeResponse(HttpRequest request, HtmlGenerator writePage) {
-    HttpResponse response = request.response;
-    response.statusCode = HttpStatus.OK;
-    response.headers.contentType = _htmlContent;
-    try {
-      StringBuffer buffer = new StringBuffer();
-      try {
-        writePage(buffer);
-      } catch (exception, stackTrace) {
-        buffer.clear();
-        _writePage(buffer, 'Internal Exception', [], (StringBuffer buffer) {
-          _writeException(buffer, new CaughtException(exception, stackTrace));
-        });
-      }
-      response.write(buffer.toString());
-    } finally {
-      response.close();
-    }
-  }
-
-  /**
-   * Write a single row within a table to the given [buffer]. The row will have
-   * one cell for each of the [columns], and will be a header row if [header] is
-   * `true`.
-   */
-  void _writeRow(StringBuffer buffer, List<Object> columns,
-      {bool header: false, List<String> classes}) {
-    buffer.write('<tr>');
-    int count = columns.length;
-    int maxClassIndex = classes == null ? 0 : classes.length - 1;
-    for (int i = 0; i < count; i++) {
-      String classAttribute = '';
-      if (classes != null) {
-        String className = classes[min(i, maxClassIndex)];
-        if (className != null) {
-          classAttribute = ' class="$className"';
-        }
-      }
-      if (header) {
-        buffer.write('<th$classAttribute>');
-      } else {
-        buffer.write('<td$classAttribute>');
-      }
-      if (columns[i] is int) {
-        buffer.write(_writeWithSeparators(columns[i]));
-      } else {
-        buffer.write(columns[i]);
-      }
-      if (header) {
-        buffer.write('</th>');
-      } else {
-        buffer.write('</td>');
-      }
-    }
-    buffer.write('</tr>');
-  }
-
-  /**
-   * Write the status of the service domain (on the main status page) to the
-   * given [response] object.
-   */
-  bool _writeServerStatus(StringBuffer buffer) {
-    AnalysisServer analysisServer = _server.analysisServer;
-    Set<ServerService> services = analysisServer.serverServices;
-
-    buffer.write('<h3>Server Domain</h3>');
-    _writeTwoColumns(buffer, (StringBuffer buffer) {
-      buffer.write('<p><b>State</b></p>');
-      if (analysisServer == null) {
-        buffer.write('Status: <span style="color:red">Not running</span>');
-        return;
-      }
-      buffer.write('Status: Running<br>');
-      buffer.write('New analysis driver: ');
-      buffer.write(analysisServer.options.enableNewAnalysisDriver);
-      buffer.write('<br>');
-      buffer.write('Instrumentation: ');
-      if (AnalysisEngine.instance.instrumentationService.isActive) {
-        buffer.write('<strong>active</strong>');
-      } else {
-        buffer.write('inactive');
-      }
-      buffer.write('<br>');
-      buffer.write('Process ID: ');
-      buffer.write(pid);
-
-      buffer.write('<p><b>Performance Data</b></p>');
-      buffer.write(makeLink(
-          COMMUNICATION_PERFORMANCE_PATH, {}, 'Communication performance'));
-
-      if (AnalysisEngine.instance.instrumentationService.isActive) {
-        buffer.write('<p><b>Instrumentation</b></p>');
-        InstrumentationServer instrumentationServer = AnalysisEngine
-            .instance.instrumentationService.instrumentationServer;
-        String description = instrumentationServer.describe;
-        HtmlEscape htmlEscape = new HtmlEscape(HtmlEscapeMode.ELEMENT);
-        description = htmlEscape.convert(description);
-        // Convert http(s): references to hyperlinks.
-        final RegExp urlRegExp = new RegExp(r'[http|https]+:\/*(\S+)');
-        description = description.replaceAllMapped(urlRegExp, (Match match) {
-          return '<a href="${match.group(0)}">${match.group(1)}</a>';
-        });
-        buffer.write(description.replaceAll('\n', '<br>'));
-      }
-    }, (StringBuffer buffer) {
-      _writeSubscriptionList(buffer, ServerService.VALUES, services);
-      buffer.write('<p><b>Versions</b></p>');
-      buffer.write('Dart SDK: ${Platform.version}<br>');
-      buffer.write('Analysis server version: ${AnalysisServer.VERSION}<br>');
-      buffer.write('<p><b>Plugins</b></p>');
-      List<PluginInfo> plugins = analysisServer.pluginManager.plugins;
-      if (plugins.isEmpty) {
-        buffer.write('none<br>');
-      } else {
-        plugins.sort(
-            (first, second) => first.data.name.compareTo(second.data.name));
-        for (PluginInfo plugin in plugins) {
-          buffer.write(plugin.data.name);
-          buffer.write(' (');
-          buffer.write(plugin.data.pluginId);
-          buffer.write(', ');
-          buffer.write(plugin.data.version);
-          buffer.write(')<br>');
-        }
-      }
-    });
-    return analysisServer != null;
-  }
-
-  /**
-   * Write a representation of the given [stackTrace] to the given [buffer].
-   */
-  void _writeStackTrace(StringBuffer buffer, StackTrace stackTrace) {
-    if (stackTrace != null) {
-      String trace = stackTrace.toString().replaceAll('#', '<br>#');
-      if (trace.startsWith('<br>#')) {
-        trace = trace.substring(4);
-      }
-      buffer.write('<p>');
-      buffer.write(trace);
-      buffer.write('</p>');
-    }
-  }
-
-  /**
-   * Given a [service] that could be subscribed to and a set of the services
-   * that are actually subscribed to ([subscribedServices]), write a
-   * representation of the service to the given [buffer].
-   */
-  void _writeSubscriptionInList(
-      StringBuffer buffer, Enum service, Set<Enum> subscribedServices) {
-    if (subscribedServices.contains(service)) {
-      buffer.write('<code>+ </code>');
-    } else {
-      buffer.write('<code>- </code>');
-    }
-    buffer.write(service.name);
-    buffer.write('<br>');
-  }
-
-  /**
-   * Given a [service] that could be subscribed to and a set of paths that are
-   * subscribed to the services ([subscribedPaths]), write a representation of
-   * the service to the given [buffer].
-   */
-  void _writeSubscriptionInMap(
-      StringBuffer buffer, Enum service, Set<String> subscribedPaths) {
-    buffer.write('<p>');
-    buffer.write(service.name);
-    buffer.write('<br>');
-    if (subscribedPaths != null && subscribedPaths.isNotEmpty) {
-      List<String> paths = subscribedPaths.toList();
-      paths.sort();
-      for (String path in paths) {
-        buffer.write('$path<br>');
-      }
-    }
-    buffer.write('</p>');
-  }
-
-  /**
-   * Given a list containing all of the services that can be subscribed to in a
-   * single domain ([allServices]) and a set of the services that are actually
-   * subscribed to ([subscribedServices]), write a representation of the
-   * subscriptions to the given [buffer].
-   */
-  void _writeSubscriptionList(StringBuffer buffer, List<Enum> allServices,
-      Set<Enum> subscribedServices) {
-    buffer.write('<p><b>Subscriptions</b></p>');
-    for (Enum service in allServices) {
-      _writeSubscriptionInList(buffer, service, subscribedServices);
-      buffer.write('<br>');
-    }
-  }
-
-  /**
-   * Given a list containing all of the services that can be subscribed to in a
-   * single domain ([allServices]) and a set of the services that are actually
-   * subscribed to ([subscribedServices]), write a representation of the
-   * subscriptions to the given [buffer].
-   */
-  void _writeSubscriptionMap(StringBuffer buffer, List<Enum> allServices,
-      Map<Enum, Set<String>> subscribedServices) {
-    buffer.write('<p><b>Subscriptions</b></p>');
-    for (Enum service in allServices) {
-      _writeSubscriptionInMap(buffer, service, subscribedServices[service]);
-    }
-  }
-
-  /**
-   * Write two columns of information to the given [buffer], where the
-   * [leftColumn] and [rightColumn] functions are used to generate the content
-   * of those columns.
-   */
-  void _writeTwoColumns(StringBuffer buffer, HtmlGenerator leftColumn,
-      HtmlGenerator rightColumn) {
-    buffer
-        .write('<table class="column"><tr class="column"><td class="column">');
-    leftColumn(buffer);
-    buffer.write('</td><td class="column">');
-    rightColumn(buffer);
-    buffer.write('</td></tr></table>');
-  }
-
-  /**
-   * Create a link to [path] with query parameters [params], with inner HTML
-   * [innerHtml]. If [hasError] is `true`, then the link will have the class
-   * 'error'.
-   */
-  static String makeLink(
-      String path, Map<String, String> params, String innerHtml,
-      [bool hasError = false]) {
-    Uri uri = params.isEmpty
-        ? new Uri(path: path)
-        : new Uri(path: path, queryParameters: params);
-    String href = HTML_ESCAPE.convert(uri.toString());
-    String classAttribute = hasError ? ' class="error"' : '';
-    return '<a href="$href" $classAttribute>$innerHtml</a>';
-  }
-}