net/test/spawned_test_server/local_test_server_win.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/test/spawned_test_server/local_test_server.h"
   6
   7 #include <windows.h>
   8
   9 #include "base/base_paths.h"
  10 #include "base/bind.h"
  11 #include "base/command_line.h"
  12 #include "base/environment.h"
  13 #include "base/files/file_path.h"
  14 #include "base/message_loop/message_loop.h"
  15 #include "base/process/launch.h"
  16 #include "base/strings/string_number_conversions.h"
  17 #include "base/strings/string_util.h"
  18 #include "base/strings/utf_string_conversions.h"
  19 #include "base/test/test_timeouts.h"
  20 #include "base/threading/thread.h"
  21 #include "base/win/scoped_handle.h"
  22 #include "net/test/python_utils.h"
  23
  24 namespace {
  25
  26 // Writes |size| bytes to |handle| and sets |*unblocked| to true.
  27 // Used as a crude timeout mechanism by ReadData().
  28 void UnblockPipe(HANDLE handle, DWORD size, bool* unblocked) {
  29   std::string unblock_data(size, '\0');
  30   // Unblock the ReadFile in LocalTestServer::WaitToStart by writing to the
  31   // pipe. Make sure the call succeeded, otherwise we are very likely to hang.
  32   DWORD bytes_written = 0;
  33   LOG(WARNING) << "Timeout reached; unblocking pipe by writing "
  34                << size << " bytes";
  35   CHECK(WriteFile(handle, unblock_data.data(), size, &bytes_written,
  36                   NULL));
  37   CHECK_EQ(size, bytes_written);
  38   *unblocked = true;
  39 }
  40
  41 // Given a file handle, reads into |buffer| until |bytes_max| bytes
  42 // has been read or an error has been encountered.  Returns
  43 // true if the read was successful.
  44 bool ReadData(HANDLE read_fd, HANDLE write_fd,
  45               DWORD bytes_max, uint8* buffer) {
  46   base::Thread thread("test_server_watcher");
  47   if (!thread.Start())
  48     return false;
  49
  50   // Prepare a timeout in case the server fails to start.
  51   bool unblocked = false;
  52   thread.message_loop()->PostDelayedTask(
  53       FROM_HERE, base::Bind(UnblockPipe, write_fd, bytes_max, &unblocked),
  54       TestTimeouts::action_max_timeout());
  55
  56   DWORD bytes_read = 0;
  57   while (bytes_read < bytes_max) {
  58     DWORD num_bytes;
  59     if (!ReadFile(read_fd, buffer + bytes_read, bytes_max - bytes_read,
  60                   &num_bytes, NULL)) {
  61       PLOG(ERROR) << "ReadFile failed";
  62       return false;
  63     }
  64     if (num_bytes <= 0) {
  65       LOG(ERROR) << "ReadFile returned invalid byte count: " << num_bytes;
  66       return false;
  67     }
  68     bytes_read += num_bytes;
  69   }
  70
  71   thread.Stop();
  72   // If the timeout kicked in, abort.
  73   if (unblocked) {
  74     LOG(ERROR) << "Timeout exceeded for ReadData";
  75     return false;
  76   }
  77
  78   return true;
  79 }
  80
  81 }  // namespace
  82
  83 namespace net {
  84
  85 bool LocalTestServer::LaunchPython(const base::FilePath& testserver_path) {
  86   base::CommandLine python_command(base::CommandLine::NO_PROGRAM);
  87   if (!GetPythonCommand(&python_command))
  88     return false;
  89
  90   python_command.AppendArgPath(testserver_path);
  91   if (!AddCommandLineArguments(&python_command))
  92     return false;
  93
  94   HANDLE child_read = NULL;
  95   HANDLE child_write = NULL;
  96   if (!CreatePipe(&child_read, &child_write, NULL, 0)) {
  97     PLOG(ERROR) << "Failed to create pipe";
  98     return false;
  99   }
 100   child_read_fd_.Set(child_read);
 101   child_write_fd_.Set(child_write);
 102
 103   // Have the child inherit the write half.
 104   if (!SetHandleInformation(child_write, HANDLE_FLAG_INHERIT,
 105                             HANDLE_FLAG_INHERIT)) {
 106     PLOG(ERROR) << "Failed to enable pipe inheritance";
 107     return false;
 108   }
 109
 110   // Pass the handle on the command-line. Although HANDLE is a
 111   // pointer, truncating it on 64-bit machines is okay. See
 112   // http://msdn.microsoft.com/en-us/library/aa384203.aspx
 113   //
 114   // "64-bit versions of Windows use 32-bit handles for
 115   // interoperability. When sharing a handle between 32-bit and 64-bit
 116   // applications, only the lower 32 bits are significant, so it is
 117   // safe to truncate the handle (when passing it from 64-bit to
 118   // 32-bit) or sign-extend the handle (when passing it from 32-bit to
 119   // 64-bit)."
 120   python_command.AppendArg("--startup-pipe=" +
 121       base::IntToString(reinterpret_cast<uintptr_t>(child_write)));
 122
 123   base::LaunchOptions launch_options;
 124   launch_options.inherit_handles = true;
 125   process_ = base::LaunchProcess(python_command, launch_options);
 126   if (!process_.IsValid()) {
 127     LOG(ERROR) << "Failed to launch " << python_command.GetCommandLineString();
 128     return false;
 129   }
 130
 131   return true;
 132 }
 133
 134 bool LocalTestServer::WaitToStart() {
 135   base::win::ScopedHandle read_fd(child_read_fd_.Take());
 136   base::win::ScopedHandle write_fd(child_write_fd_.Take());
 137
 138   uint32 server_data_len = 0;
 139   if (!ReadData(read_fd.Get(), write_fd.Get(), sizeof(server_data_len),
 140                 reinterpret_cast<uint8*>(&server_data_len))) {
 141     LOG(ERROR) << "Could not read server_data_len";
 142     return false;
 143   }
 144   std::string server_data(server_data_len, '\0');
 145   if (!ReadData(read_fd.Get(), write_fd.Get(), server_data_len,
 146                 reinterpret_cast<uint8*>(&server_data[0]))) {
 147     LOG(ERROR) << "Could not read server_data (" << server_data_len
 148                << " bytes)";
 149     return false;
 150   }
 151
 152   if (!ParseServerData(server_data)) {
 153     LOG(ERROR) << "Could not parse server_data: " << server_data;
 154     return false;
 155   }
 156
 157   return true;
 158 }
 159
 160 }  // namespace net
 161