cefpython/cefpython/cefpython.pyx at 03b49df6c0e0323dec22912046ff62d52bd48258 · viadata/cefpython

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# License: New BSD License.

# Website: http://code.google.com/p/cefpython/

# IMPORTANT notes:

# - cdef/cpdef functions returning something other than a Python object

# should have in its declaration "except *", otherwise exceptions are

# ignored. Those cdef/cpdef that return "object" have "except *" by

# default. The setup/compile.py script will check for functions missing

# "except *" and will display an error message about that, but it's

# not perfect and won't detect all cases.

# - TODO: add checking for "except * with gil" in functions with the

# "public" keyword

# - about acquiring/releasing GIL lock, see discussion here:

# https://groups.google.com/forum/?fromgroups=#!topic/cython-users/jcvjpSOZPp0

# - <CefRefPtr[ClientHandler]?>new ClientHandler()

# <...?> means to throw an error if the cast is not allowed

# - in client handler callbacks (or others that are called from C++ and

# use "except * with gil") must embrace all code in try..except otherwise

# the error will be ignored, only printed to the output console, this is the

# default behavior of Cython, to remedy this you are supposed to add "except *"

# in function declaration, unfortunately it does not work, some conflict with

# CEF threading, see topic at cython-users for more details:

# https://groups.google.com/d/msg/cython-users/CRxWoX57dnM/aufW3gXMhOUJ.

# - CTags requires all functions/methods imported in .pxd files to be preceded with "cdef",

# otherwise they are not indexed.

# - __del__ method does not exist in Extension Types (cdef class),

# you have to use __dealloc__ instead, try to remember that as

# defining __del__ will not raise any warning and could lead to

# memory leaks.

# - CefString.c_str() is safe to use only on Windows, on Ubuntu 64bit

# for a "Pers" string it returns: "P\x00e\x00r\x00s\x00", which is

# most probably not what you expected.

# - You can rename methods when importing in pxd files:

# | cdef cppclass _Object "Object":

# - Supporting operators that are not yet supported:

# | CefRefPtr[T]& Assign "operator="(T* p)

# | cefBrowser.Assign(CefBrowser*)

# In the same way you can import function with a different name, this one

# imports a static method Create() while adding a prefix "CefSome_":

# | cdef extern from "..":

# | static CefRefPtr[CefSome] CefSome_Create "CefSome::Create"()

# - Declaring C++ classes in Cython. Storing python callbacks

# in a C++ class using Py_INCREF, Py_DECREF. Calling from

# C++ using PyObject_CallMethod.

# | http://stackoverflow.com/a/17070382/623622

# Disadvantage: when calling python callback from the C++ class

# declared in Cython there is no easy way to propagate the python

# exceptions when they occur during execution of the callback.

# - | cdef char* other_c_string = py_string

# This is a very fast operation after which other_c_string points

# to the byte string buffer of the Python string itself. It is

# tied to the life time of the Python string. When the Python

# string is garbage collected, the pointer becomes invalid.

# - Do not define cpdef functions returning "cpp_bool":

# | cpdef cpp_bool myfunc() except *:

# This causes compiler warnings like this:

# | cefpython.cpp(26533) : warning C4800: 'int' : forcing value

# | to bool 'true' or 'false' (performance warning)

# Do instead declare "py_bool" as return type:

# | cpdef py_bool myufunc():

# Lots of these warnings results in ignoring them, but sometimes

# they are shown for a good reason, for example when you forget

# to return a value in a function.

# - Always import bool from libcpp as cpp_bool, if you import it as

# "bool" in a pxd file, then Cython will complain about bool casts

# like "bool(1)" being invalid, in pyx files.

# Global variables.

g_debug = False

g_debugFile = None

# When put None here and assigned a local dictionary in Initialize(), later while

# running app this global variable was garbage collected, see topic:

# https://groups.google.com/d/topic/cython-users/0dw3UASh7HY/discussion

g_applicationSettings = {}

# All .pyx files need to be included here.

include "cython_includes/compile_time_constants.pxi"

include "imports.pyx"

include "utils.pyx"

include "string_utils.pyx"

IF UNAME_SYSNAME == "Windows":

include "string_utils_win.pyx"

include "time_utils.pyx"

include "window_info.pyx"

include "browser.pyx"

include "frame.pyx"

IF CEF_VERSION == 1:

include "cookie.pyx"

include "settings.pyx"

IF UNAME_SYSNAME == "Windows":

# Off-screen rendering currently supported only on Windows

include "paint_buffer.pyx"

IF UNAME_SYSNAME == "Windows":

include "window_utils_win.pyx"

IF CEF_VERSION == 1:

include "http_authentication_win.pyx"

ELIF UNAME_SYSNAME == "Linux":

include "window_utils_linux.pyx"

include "javascript_bindings.pyx"

IF CEF_VERSION == 1:

include "load_handler.pyx"

include "keyboard_handler.pyx"

include "virtual_keys.pyx"

include "request.pyx"

include "web_request.pyx"

include "stream.pyx"

include "content_filter.pyx"

include "request_handler.pyx"

include "response.pyx"

include "display_handler.pyx"

include "lifespan_handler_cef1.pyx"

IF UNAME_SYSNAME == "Windows":

# Off-screen rendering currently supported only on Windows.

include "render_handler.pyx"

include "drag_data.pyx"

include "drag_handler.pyx"

include "download_handler.pyx"

include "v8context_handler_cef1.pyx"

include "v8function_handler_cef1.pyx"

include "v8utils_cef1.pyx"

include "javascript_callback_cef1.pyx"

include "python_callback.pyx"

IF CEF_VERSION == 3:

include "process_message_utils.pyx"

include "v8context_handler_cef3.pyx"

include "v8function_handler_cef3.pyx"

include "javascript_callback_cef3.pyx"

include "python_callback_cef3.pyx"

include "lifespan_handler_cef3.pyx"

# Try not to run any of the CEF code until Initialize() is called.

# Do not allocate any memory on the heap until Initialize() is called,

# that's why we're not instantiating the ClientHandler class here in

# the declaration. CEF hooks up its own tcmalloc globally when the

# library is loaded, but the memory allocation implementation may still

# be changed by another library (wx/gtk) before Initialize() is called.

cdef CefRefPtr[ClientHandler] g_clientHandler

def Initialize(applicationSettings=None):

Debug("-" * 60)

Debug("Initialize() called")

global g_clientHandler

if not g_clientHandler.get():

g_clientHandler = <CefRefPtr[ClientHandler]?>new ClientHandler()

cdef CefRefPtr[CefApp] cefApp

IF CEF_VERSION == 3:

cefApp = <CefRefPtr[CefApp]?>new CefPythonApp()

IF UNAME_SYSNAME == "Windows":

cdef HINSTANCE hInstance = GetModuleHandle(NULL)

cdef CefMainArgs cefMainArgs = CefMainArgs(hInstance)

ELIF UNAME_SYSNAME == "Linux":

# TODO: use the CefMainArgs(int argc, char** argv) constructor.

cdef CefMainArgs cefMainArgs

cdef int exitCode = CefExecuteProcess(cefMainArgs, cefApp)

Debug("CefExecuteProcess(): exitCode = %s" % exitCode)

if exitCode >= 0:

sys.exit(exitCode)

if not applicationSettings:

applicationSettings = {}

if not "multi_threaded_message_loop" in applicationSettings:

applicationSettings["multi_threaded_message_loop"] = False

if not "string_encoding" in applicationSettings:

applicationSettings["string_encoding"] = "utf-8"

IF CEF_VERSION == 3:

if not "single_process" in applicationSettings:

applicationSettings["single_process"] = False

# We must make a copy as applicationSettings is a reference only that might get destroyed.

global g_applicationSettings

for key in applicationSettings:

g_applicationSettings[key] = copy.deepcopy(applicationSettings[key])

cdef CefSettings cefApplicationSettings

SetApplicationSettings(applicationSettings, &cefApplicationSettings)

Debug("CefInitialize()")

cdef cpp_bool ret

IF CEF_VERSION == 1:

ret = CefInitialize(cefApplicationSettings, cefApp)

ELIF CEF_VERSION == 3:

ret = CefInitialize(cefMainArgs, cefApplicationSettings, cefApp)

if not ret: Debug("CefInitialize() failed")

return ret

def CreateBrowserSync(windowInfo, browserSettings, navigateUrl):

Debug("CreateBrowserSync() called")

assert IsThread(TID_UI), (

"cefpython.CreateBrowserSync() may only be called on the UI thread")

if not isinstance(windowInfo, WindowInfo):

raise Exception("CreateBrowserSync() failed: windowInfo: invalid object")

cdef CefBrowserSettings cefBrowserSettings

SetBrowserSettings(browserSettings, &cefBrowserSettings)

cdef CefWindowInfo cefWindowInfo

SetCefWindowInfo(cefWindowInfo, windowInfo)

navigateUrl = GetNavigateUrl(navigateUrl)

Debug("navigateUrl: %s" % navigateUrl)

cdef CefString cefNavigateUrl

PyToCefString(navigateUrl, cefNavigateUrl)

Debug("CefBrowser::CreateBrowserSync()")

global g_clientHandler

cdef CefRefPtr[CefBrowser] cefBrowser = cef_browser_static.CreateBrowserSync(

cefWindowInfo, <CefRefPtr[CefClient]?>g_clientHandler, cefNavigateUrl,

cefBrowserSettings)

if <void*>cefBrowser == NULL:

Debug("CefBrowser::CreateBrowserSync() failed")

return None

else:

Debug("CefBrowser::CreateBrowserSync() succeeded")

cdef PyBrowser pyBrowser = GetPyBrowser(cefBrowser)

pyBrowser.SetUserData("__outerWindowHandle", int(windowInfo.parentWindowHandle))

# IF CEF_VERSION == 3:

# Test whether process message sent before renderer thread is created

# will be delivered - OK.

# Debug("Sending 'CreateBrowserSync() done' message to the Renderer")

# pyBrowser.SendProcessMessage(cef_types.PID_RENDERER,

# "CreateBrowserSync() done")

return pyBrowser

def MessageLoop():

Debug("MessageLoop()")

with nogil:

CefRunMessageLoop()

def MessageLoopWork():

# Perform a single iteration of CEF message loop processing.

# This function is used to integrate the CEF message loop

# into an existing application message loop.

# Anything that can block for a significant amount of time

# and is thread-safe should release the GIL:

# https://groups.google.com/d/msg/cython-users/jcvjpSOZPp0/KHpUEX8IhnAJ

# GIL must be released here otherwise we will get dead lock

# when calling from c++ to python.

with nogil:

CefDoMessageLoopWork();

def SingleMessageLoop():

# @deprecated, use MessageLoopWork() instead

MessageLoopWork()

def QuitMessageLoop():

Debug("QuitMessageLoop()")

CefQuitMessageLoop()

def Shutdown():

Debug("Shutdown()")

CefShutdown()

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