Add named testing interface. This allows you to connect to a pre-existing Chrome process and run tests on it. This is an addition to the low level interface underlying testing frameworks like PyAuto and WebDriver.

Normally, test frameworks communicate with Chrome over an unnamed socket pair on POSIX. The test creates the socket pair and then launches the browser as a child process, passing an open file descriptor for one end of the socket to the browser. This change adds a command line switch that, when passed to the browser, causes it to listen on a named socket instead, eliminating this parent/child process requirement. Therefore, you can potentially connect any number of tests to a preexisting browser process.

For ChromeOS, this allows you to run tests on the instance of Chrome that is launched on startup, which controls things like the login and lock screens, the battery meter, the wireless UI, etc. Currently there is no way to run tests on a pre-existing Chrome instance. Eventually this will also allow you to connect both PyAuto and WebDriver to the same Chrome instance and run both in the same test.

If you pass the browser the following command line switch:
./chrome --testing-channel=NamedTestingInterface:/path/to/file
This causes the browser to listen for incoming connections. An AutomationProxy can connect to the browser by connecting a Unix domain socket to the specified path and control the browser over the socket.

This is currently only for POSIX. Windows support will come in a future change. Also, this initial change only allows one connection; multiple connection support will come in a future change.

BUG=chromium-os:8512
TEST=Run Chrome with --testing-interface=/var/tmp/NamedTestingInterface, then run NamedInterfaceTest.BasicNamedInterface under ui_tests.

Review URL: http://codereview.chromium.org/4202004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67300 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 14 insertions, 6 deletions

diff --git a/ipc/ipc_channel.h b/ipc/ipc_channel.h
index 2445e51..27b055c1 100644
--- a/ipc/ipc_channel.h
+++ b/ipc/ipc_channel.h
@@ -38,7 +38,9 @@ class Channel : public Message::Sender {
   enum Mode {
     MODE_NONE,
     MODE_SERVER,
-    MODE_CLIENT
+    MODE_CLIENT,
+    MODE_NAMED_SERVER,
+    MODE_NAMED_CLIENT
   };
 
   enum {
diff --git a/ipc/ipc_channel_posix.cc b/ipc/ipc_channel_posix.cc
index 86d1673..65a04e1 100644
--- a/ipc/ipc_channel_posix.cc
+++ b/ipc/ipc_channel_posix.cc
@@ -273,8 +273,9 @@ Channel::ChannelImpl::ChannelImpl(const std::string& channel_id, Mode mode,
     : mode_(mode),
       is_blocked_on_write_(false),
       message_send_bytes_written_(0),
-      uses_fifo_(CommandLine::ForCurrentProcess()->HasSwitch(
-                     switches::kIPCUseFIFO)),
+      uses_fifo_(
+          CommandLine::ForCurrentProcess()->HasSwitch(switches::kIPCUseFIFO) ||
+          mode == MODE_NAMED_SERVER || mode == MODE_NAMED_CLIENT),
       server_listen_pipe_(-1),
       pipe_(-1),
       client_pipe_(-1),
@@ -285,10 +286,15 @@ Channel::ChannelImpl::ChannelImpl(const std::string& channel_id, Mode mode,
       listener_(listener),
       waiting_connect_(true),
       factory_(this) {
-  if (!CreatePipe(channel_id, mode)) {
+  if (mode_ == MODE_NAMED_SERVER)
+    mode_ = MODE_SERVER;
+  if (mode_ == MODE_NAMED_CLIENT)
+    mode_ = MODE_CLIENT;
+
+  if (!CreatePipe(channel_id, mode_)) {
     // The pipe may have been closed already.
     PLOG(WARNING) << "Unable to create pipe named \"" << channel_id
-                  << "\" in " << (mode == MODE_SERVER ? "server" : "client")
+                  << "\" in " << (mode_ == MODE_SERVER ? "server" : "client")
                   << " mode";
   }
 }
@@ -346,7 +352,7 @@ bool Channel::ChannelImpl::CreatePipe(const std::string& channel_id,
     // TODO(playmobil): We shouldn't need to create fifos on disk.
     // TODO(playmobil): If we do, they should be in the user data directory.
     // TODO(playmobil): Cleanup any stale fifos.
-    pipe_name_ = "/var/tmp/chrome_" + channel_id;
+    pipe_name_ = channel_id;
     if (mode == MODE_SERVER) {
       if (!CreateServerFifo(pipe_name_, &server_listen_pipe_)) {
         return false;