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from ctypes import *
import ctypes.util
import weakref
_WEBVIERR_OK = 0
_WEBVI_INVALID_HANDLE = -1
_WEBVIOPT_WRITEFUNC = 0
_WEBVIOPT_READFUNC = 1
_WEBVIOPT_WRITEDATA = 2
_WEBVIOPT_READDATA = 3
_WEBVIINFO_URL = 0
_WEBVIINFO_CONTENT_LENGTH = 1
_WEBVIINFO_CONTENT_TYPE = 2
_WEBVIINFO_STREAM_TITLE = 3
_WEBVI_CONFIG_TEMPLATE_PATH = 0
_WEBVI_CONFIG_DEBUG = 1
_WEBVI_CONFIG_TIMEOUT_CALLBACK = 2
_WEBVI_CONFIG_TIMEOUT_DATA = 3
_WEBVI_CONFIG_MENU_SCRIPT_PATH = 4
class WebviState:
NOT_FINISHED = 0
FINISHED_OK = 1
NOT_FOUND = 2
NETWORK_READ_ERROR = 3
IO_ERROR = 4
TIMEDOUT = 5
INTERNAL_ERROR = 999
class WebviMsg(Structure):
_fields_ = [("msg", c_int),
("handle", c_int),
("status_code", c_int),
("data", c_char_p)]
class WeakRequestRef(weakref.ref):
pass
class WebviError(Exception):
pass
def raise_if_webvi_result_not_ok(value):
if value != _WEBVIERR_OK:
raise WebviError('libwebvi function returned error code %d: %s' %
(value, strerror(value)))
return value
def raise_if_request_not_ok(value):
if value == -1:
raise WebviError('libwebvi request initialization failed')
return value
_libc = CDLL(ctypes.util.find_library("c"))
_libc.free.argtypes = [c_void_p]
_libc.free.restype = None
libwebvi = CDLL("libwebvi.so")
libwebvi.webvi_global_init()
libwebvi.webvi_initialize_context.argtypes = []
libwebvi.webvi_initialize_context.restype = c_long
libwebvi.webvi_version.argtypes = []
libwebvi.webvi_version.restype = c_char_p
libwebvi.webvi_strerror.argtypes = [c_int]
libwebvi.webvi_strerror.restype = c_char_p
libwebvi.webvi_new_request.argtypes = [c_long, c_char_p]
libwebvi.webvi_new_request.restype = raise_if_request_not_ok
libwebvi.webvi_delete_request.argtypes = [c_long, c_int]
libwebvi.webvi_delete_request.restype = raise_if_webvi_result_not_ok
libwebvi.webvi_process_some.argtypes = [c_long, c_int]
libwebvi.webvi_process_some.restype = c_int
libwebvi.webvi_get_message.argtypes = [c_long, POINTER(c_int)]
libwebvi.webvi_get_message.restype = POINTER(WebviMsg)
libwebvi.webvi_start_request.argtypes = [c_long, c_int]
libwebvi.webvi_start_request.restype = raise_if_webvi_result_not_ok
libwebvi.webvi_stop_request.argtypes = [c_long, c_int]
libwebvi.webvi_stop_request.restype = raise_if_webvi_result_not_ok
WEBVICALLBACK = CFUNCTYPE(c_ssize_t, c_char_p, c_size_t, c_void_p)
TIMEOUTFUNC = CFUNCTYPE(None, c_long, c_void_p)
def version():
return string_at(libwebvi.webvi_version())
def strerror(err):
return string_at(libwebvi.webvi_strerror(err))
class WebviContext:
def __init__(self):
self.handle = libwebvi.webvi_initialize_context()
self._requests = {}
self.timeout_callback = None
def __del__(self):
libwebvi.webvi_cleanup_context(self.handle)
self.handle = None
def set_template_path(self, path):
if self.handle is None:
return
set_config = libwebvi.webvi_set_config
set_config.argtypes = [c_long, c_int, c_char_p]
set_config.restype = raise_if_webvi_result_not_ok
set_config(self.handle, _WEBVI_CONFIG_TEMPLATE_PATH, path)
def set_menu_script_path(self, path):
if self.handle is None:
return
set_config = libwebvi.webvi_set_config
set_config.argtypes = [c_long, c_int, c_char_p]
set_config.restype = raise_if_webvi_result_not_ok
set_config(self.handle, _WEBVI_CONFIG_MENU_SCRIPT_PATH, path)
def set_debug(self, enabled):
if self.handle is None:
return
set_config = libwebvi.webvi_set_config
set_config.argtypes = [c_long, c_int, c_char_p]
set_config.restype = raise_if_webvi_result_not_ok
if enabled:
debug = "1"
else:
debug = "0"
set_config(self.handle, _WEBVI_CONFIG_DEBUG, debug)
def set_timeout_callback(self, cb):
def callback_wrapper(timeout, userdata):
return cb(timeout)
set_config = libwebvi.webvi_set_config
set_config.argtypes = [c_long, c_int, TIMEOUTFUNC]
set_config.restype = raise_if_webvi_result_not_ok
self.timeout_callback = TIMEOUTFUNC(callback_wrapper)
set_config(self.handle, _WEBVI_CONFIG_TIMEOUT_CALLBACK,
self.timeout_callback)
def process_some(self, timeout_seconds=0):
return libwebvi.webvi_process_some(self.handle, int(timeout_seconds))
def get_finished_request(self):
remaining = c_int(0)
msg_ptr = libwebvi.webvi_get_message(self.handle, byref(remaining))
if not msg_ptr or msg_ptr.contents.msg != 0:
return None
reqhandle = msg_ptr.contents.handle
if reqhandle not in self._requests:
return None
request = self._requests[reqhandle]()
if request is None:
return None
return (request,
msg_ptr.contents.status_code,
string_at(msg_ptr.contents.data))
def register_request(self, request):
def unregister_request(ref):
del self._requests[ref.handle]
libwebvi.webvi_delete_request(self.handle, ref.handle)
ref = WeakRequestRef(request, unregister_request)
ref.handle = request.handle
self._requests[request.handle] = ref
class WebviRequest:
def __init__(self, context, href):
self.context = context
self.read_callback = None
self.handle = libwebvi.webvi_new_request(context.handle, href)
if self.handle == _WEBVI_INVALID_HANDLE:
raise WebviError('Initializing request failed')
self.context.register_request(self)
def start(self):
libwebvi.webvi_start_request(self.context.handle, self.handle)
def stop(self):
libwebvi.webvi_stop_request(self.context.handle, self.handle)
def set_read_callback(self, cb):
def callback_wrapper(buf, length, userdata):
return cb(string_at(buf, length))
set_opt = libwebvi.webvi_set_opt
set_opt.argstypes = [c_long, c_int, c_int, WEBVICALLBACK]
set_opt.restype = raise_if_webvi_result_not_ok
# Must keep a reference to the callback!
self.read_callback = WEBVICALLBACK(callback_wrapper)
set_opt(self.context.handle, self.handle,
_WEBVIOPT_READFUNC, self.read_callback)
# def set_write_callback(self, cb):
# def callback_wrapper(buf, length, userdata):
# return cb(string_at(buf, length))
# set_opt = libwebvi.webvi_set_opt
# set_opt.argstypes = [c_long, c_int, c_int, WEBVICALLBACK]
# set_opt.restype = raise_if_webvi_result_not_ok
# set_opt(self.context.handle, self.handle, _WEBVIOPT_WRITEFUNC,
# WEBVICALLBACK(callback_wrapper))
def get_url(self):
get_info = libwebvi.webvi_get_info
get_info.argtypes = [c_long, c_int, c_int, POINTER(c_char_p)]
get_info.restype = raise_if_webvi_result_not_ok
output = c_char_p()
get_info(self.context.handle, self.handle,
_WEBVIINFO_URL, pointer(output))
url = string_at(output)
_libc.free(output)
return url
def get_content_length(self):
get_info = libwebvi.webvi_get_info
get_info.argtypes = [c_long, c_int, c_int, POINTER(c_long)]
get_info.restype = raise_if_webvi_result_not_ok
output = c_long(0)
get_info(self.context.handle, self.handle,
_WEBVIINFO_CONTENT_LENGTH, pointer(output))
return output.value
def get_content_type(self):
get_info = libwebvi.webvi_get_info
get_info.argtypes = [c_long, c_int, c_int, POINTER(c_char_p)]
get_info.restype = raise_if_webvi_result_not_ok
output = c_char_p()
get_info(self.context.handle, self.handle,
_WEBVIINFO_CONTENT_TYPE, pointer(output))
content_type = string_at(output)
_libc.free(output)
return content_type
def get_stream_title(self):
get_info = libwebvi.webvi_get_info
get_info.argtypes = [c_long, c_int, c_int, POINTER(c_char_p)]
get_info.restype = raise_if_webvi_result_not_ok
output = c_char_p()
get_info(self.context.handle, self.handle,
_WEBVIINFO_STREAM_TITLE, pointer(output))
title = string_at(output)
_libc.free(output)
return title
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