Create generated tests inside the build directory

tools/testing/dart/http_server.dart

Index: tools/testing/dart/http_server.dart
diff --git a/tools/testing/dart/http_server.dart b/tools/testing/dart/http_server.dart
index 06b87da3960551c77cfe4386dad504c64c41d7e0..6ab495b7af70baa95076b66026ba5a2b75656377 100644
--- a/tools/testing/dart/http_server.dart
+++ b/tools/testing/dart/http_server.dart
@@ -4,6 +4,7 @@
 
 library http_server;
 
+import 'dart:async';
 import 'dart:io';
 import 'dart:isolate';
 import 'dart:uri';
@@ -12,6 +13,30 @@ import 'test_suite.dart';  // For TestUtils.
 // expected number of arguments, so test.dart doesn't rely on the args library?
 // See discussion on https://codereview.chromium.org/11931025/.
 import 'vendored_pkg/args/args.dart';
+import 'utils.dart';
+
+
+/// Interface of the HTTP server:
+///
+/// /echo: This will stream the data received in the request stream back 
+///        to the client.
+/// /root_dart/X: This will serve the corresponding file from the dart
+///               directory (i.e. '$DartDirectory/X').
+/// /root_build/X: This will serve the corresponding file from the build
+///                directory (i.e. '$BuildDirectory/X').
+/// /FOO/packages/BAR: This will serve the corresponding file from the packages
+///                    directory (i.e. '$BuildDirectory/packages/BAR')
+///
+/// In case a path does not refer to a file but rather to a directory, a
+/// directory listing will be displayed.
+
+const PREFIX_BUILDDIR = 'root_build';
+const PREFIX_DARTDIR = 'root_dart';
+
+// TODO(kustermann,ricow): We could change this to the following scheme:
+// http://host:port/root_packages/X -> $BuildDir/packages/X
+// Issue: 8368
+
 
 main() {
   /** Convenience method for local testing. */
@@ -43,7 +68,11 @@ main() {
         .join(new Path('../../test.dart'))
         .canonicalize()
         .toNativePath();
+    // Note: args['package-root'] is always the build directory. We have the
+    // implicit assumption that it contains the 'packages' subdirectory.
+    // TODO: We should probably rename 'package-root' to 'build-directory'.
     TestingServerRunner._packageRootDir = new Path(args['package-root']);
+    TestingServerRunner._buildDirectory = new Path(args['package-root']);
     var network = args['network'];
     TestingServerRunner.startHttpServer(network,
         port: int.parse(args['port']));
@@ -63,96 +92,127 @@ main() {
 class TestingServerRunner {
   static List serverList = [];
   static Path _packageRootDir = null;
+  static Path _buildDirectory = null;
 
   // Added as a getter so that the function will be called again each time the
   // default request handler closure is executed.
   static Path get packageRootDir => _packageRootDir;
+  static Path get buildDirectory => _buildDirectory;
 
   static setPackageRootDir(Map configuration) {
-    _packageRootDir = TestUtils.currentWorkingDirectory.join(
+    _packageRootDir = TestUtils.absolutePath(
+        new Path(TestUtils.buildDir(configuration)));
+  }
+
+  static setBuildDir(Map configuration) {
+    _buildDirectory = TestUtils.absolutePath(
         new Path(TestUtils.buildDir(configuration)));
   }
 
   static startHttpServer(String host, {int allowedPort:-1, int port: 0}) {
-    var basePath = TestUtils.dartDir();
     var httpServer = new HttpServer();
-    var packagesDirName = 'packages';
     httpServer.onError = (e) {
-      // TODO(ricow): Once we have a debug log we should write this out there.
-      print('Test http server error: $e');
+      DebugLogger.error('HttpServer: an error occured: $e');
     };
-    httpServer.defaultRequestHandler = (request, resp) {
-      var requestPath = new Path(request.path.substring(1)).canonicalize();
-      var path = basePath.join(requestPath);
-      var file = new File(path.toNativePath());
-
-      if (requestPath.segments().contains(packagesDirName)) {
-        // Essentially implement the packages path rewriting, so we don't have
-        // to pass environment variables to the browsers.
-        var requestPathStr = requestPath.toNativePath().substring(
-            requestPath.toNativePath().indexOf(packagesDirName));
-        path = packageRootDir.append(requestPathStr);
-        file = new File(path.toNativePath());
-      }
+    httpServer.defaultRequestHandler = (request, response) {
+      handleFileOrDirectoryRequest(request, response, allowedPort);
+    };
+    httpServer.addRequestHandler(
+        (req) => req.path == "/echo", handleEchoRequest);
+
+    httpServer.listen(host, port);
+    serverList.add(httpServer);
+  }
+
+
+  static void handleFileOrDirectoryRequest(HttpRequest request,
+                                           HttpResponse response,
+                                           int allowedPort) {
+    var path = getFilePathFromRequestPath(request.path);
+    if (path != null) {
+      var file = new File.fromPath(path);
       file.exists().then((exists) {
         if (exists) {
-          if (allowedPort != -1) {
-            if (request.headers.value('Origin') != null) {
-              var origin = new Uri(request.headers.value('Origin'));
-              // Allow loading from http://*:$allowedPort in browsers.
-              var allowedOrigin =
-                  '${origin.scheme}://${origin.domain}:${allowedPort}';
-              resp.headers.set("Access-Control-Allow-Origin", allowedOrigin);
-              resp.headers.set('Access-Control-Allow-Credentials', 'true');
-            }
-          } else {
-            // No allowedPort specified. Allow from anywhere (but cross-origin
-            // requests *with credentials* will fail because you can't use "*").
-            resp.headers.set("Access-Control-Allow-Origin", "*");
-          }
-          if (path.toNativePath().endsWith('.html')) {
-            resp.headers.set('Content-Type', 'text/html');
-          } else if (path.toNativePath().endsWith('.js')) {
-            resp.headers.set('Content-Type', 'application/javascript');
-          } else if (path.toNativePath().endsWith('.dart')) {
-            resp.headers.set('Content-Type', 'application/dart');
-          }
-          file.openInputStream().pipe(resp.outputStream);
+          sendFileContent(request, response, allowedPort, path, file);
         } else {
           var directory = new Directory.fromPath(path);
           directory.exists().then((exists) {
-            if (!exists) {
-              sendNotFound(resp);
+            if (exists) {
+              listDirectory(directory).then((entries) {
+                sendDirectoryListing(entries, request, response);
+              });
             } else {
-              sendDirectoryListing(directory, request, resp);
+              sendNotFound(request, response);
             }
           });
         }
       });
-    };
-
-    // Echos back the contents of the request as the response data.
-    httpServer.addRequestHandler((req) => req.path == "/echo", (request, resp) {
-      resp.headers.set("Access-Control-Allow-Origin", "*");
-
-      request.inputStream.pipe(resp.outputStream);
-    });
+    } else {
+      if (request.path == '/') {
+        var entries = [new _Entry('root_dart', 'root_dart/'),
+                       new _Entry('root_build', 'root_build/'),
+                       new _Entry('echo', 'echo')];
+        sendDirectoryListing(entries, request, response);
+      } else {
+        sendNotFound(request, response);
+      }
+    }
+  }
 
-    httpServer.listen(host, port);
-    serverList.add(httpServer);
+  static void handleEchoRequest(HttpRequest request, HttpResponse response) {
+    response.headers.set("Access-Control-Allow-Origin", "*");
+    request.inputStream.pipe(response.outputStream);
   }
 
-  static void sendNotFound(HttpResponse response) {
-    response.statusCode = HttpStatus.NOT_FOUND;
-    try {
-      response.outputStream.close();
-    } catch (e) {
-      if (e is StreamException) {
-        print('Test http_server error closing the response stream: $e');
-      } else {
-        throw e;
+  static Path getFilePathFromRequestPath(String urlRequestPath) {
+    // Go to the top of the file to see an explanation of the URL path scheme.
+    var requestPath = new Path(urlRequestPath.substring(1)).canonicalize();
+    var pathSegments = requestPath.segments();
+    if (pathSegments.length > 0) {
+      var basePath;
+      var relativePath;
+      if (pathSegments[0] == PREFIX_BUILDDIR) {
+        basePath = _buildDirectory;
+        relativePath = new Path(
+            pathSegments.getRange(1, pathSegments.length - 1).join('/'));
+      } else if (pathSegments[0] == PREFIX_DARTDIR) {
+        basePath = TestUtils.dartDir();
+        relativePath = new Path(
+            pathSegments.getRange(1, pathSegments.length - 1).join('/'));
+      }
+      var packagesDirName = 'packages';
+      var packagesIndex = pathSegments.indexOf(packagesDirName);
+      if (packagesIndex != -1) {
+        var start = packagesIndex + 1;
+        var length = pathSegments.length - start;
+        basePath = _packageRootDir.append(packagesDirName);
+        relativePath = new Path(
+            pathSegments.getRange(start, length).join('/'));
+      }
+      if (basePath != null && relativePath != null) {
+        return basePath.join(relativePath);
       }
     }
+    return null;
+  }
+
+  static Future<List<_Entry>> listDirectory(Directory directory) {
+    var completer = new Completer();
+    var entries = [];
+
+    directory.list()
+      ..onFile = (filepath) {
+        var filename = new Path(filepath).filename;
+        entries.add(new _Entry(filename, filename));
+      }
+      ..onDir = (dirpath) {
+        var filename = new Path(dirpath).filename;
+        entries.add(new _Entry(filename, '$filename/'));
+      }
+      ..onDone = (_) {
+        completer.complete(entries);
+      };
+    return completer.future;
   }
 
   /**
@@ -162,8 +222,9 @@ class TestingServerRunner {
    * This is intended to make it easier to browse tests when manually running
    * tests against this test server.
    */
-  static void sendDirectoryListing(Directory directory, HttpRequest request,
-      HttpResponse response) {
+  static void sendDirectoryListing(entries,
+                                   HttpRequest request,
+                                   HttpResponse response) {
     response.headers.set('Content-Type', 'text/html');
     var header = '''<!DOCTYPE html>
     <html>
@@ -181,30 +242,62 @@ class TestingServerRunner {
     </body>
     </html>''';
 
-    var entries = [];
 
-    directory.list()
-      ..onFile = (filepath) {
-        var filename = new Path(filepath).filename;
-        entries.add(new _Entry(filename, filename));
-      }
-      ..onDir = (dirpath) {
-        var filename = new Path(dirpath).filename;
-        entries.add(new _Entry(filename, '$filename/'));
+    entries.sort();
+    response.outputStream.writeString(header);
+    for (var entry in entries) {
+      response.outputStream.writeString(
+          '<li><a href="${new Path(request.path).append(entry.name)}">'
+          '${entry.displayName}</a></li>');
+    }
+    response.outputStream.writeString(footer);
+    response.outputStream.close();
+  }
+
+  static void sendFileContent(HttpRequest request,
+                              HttpResponse response,
+                              int allowedPort,
+                              Path path,
+                              File file) {
+    if (allowedPort != -1) {
+      var origin = new Uri(request.headers.value('Origin'));
+      // Allow loading from http://*:$allowedPort in browsers.
+      var allowedOrigin =
+          '${origin.scheme}://${origin.domain}:${allowedPort}';
+      response.headers.set("Access-Control-Allow-Origin", allowedOrigin);
+      response.headers.set('Access-Control-Allow-Credentials', 'true');
+    } else {
+      // No allowedPort specified. Allow from anywhere (but cross-origin
+      // requests *with credentials* will fail because you can't use "*").
+      response.headers.set("Access-Control-Allow-Origin", "*");
+    }
+    if (path.filename.endsWith('.html')) {
+      response.headers.set('Content-Type', 'text/html');
+    } else if (path.filename.endsWith('.js')) {
+      response.headers.set('Content-Type', 'application/javascript');
+    } else if (path.filename.endsWith('.dart')) {
+      response.headers.set('Content-Type', 'application/dart');
+    }
+    file.openInputStream().pipe(response.outputStream);
+  }
+
+  static void sendNotFound(HttpRequest request, HttpResponse response) {
+    // NOTE: Since some tests deliberately try to access non-existent files.
+    // We might want to remove this warning (otherwise it will show
+    // up in the debug.log every time).
+    DebugLogger.warning('HttpServer: could not find file for request path: '
+                        '"${request.path}"');
+    response.statusCode = HttpStatus.NOT_FOUND;
+    try {
+      response.outputStream.close();
+    } catch (e) {
+      if (e is StreamException) {
+        DebugLogger.warning('HttpServer: error while closing the response '
+                            'stream: $e');
+      } else {
+        throw e;
       }
-      ..onDone = (_) {
-        var requestPath = new Path.raw(request.path);
-        entries.sort();
-
-        response.outputStream.writeString(header);
-        for (var entry in entries) {
-          response.outputStream.writeString(
-              '<li><a href="${requestPath.append(entry.name)}">'
-              '${entry.displayName}</a></li>');
-        }
-        response.outputStream.writeString(footer);
-        response.outputStream.close();
-      };
+    }
   }
 
   static terminateHttpServers() {