Ajout du GUI

kivy/network/__init__.py

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+'''
+Network support
+===============
+
+Kivy currently supports basic, asynchronous network requests.
+Please refer to :class:`kivy.network.urlrequest.UrlRequest`.
+'''

kivy/network/urlrequest.py

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+'''
+UrlRequest
+==========
+
+.. versionadded:: 1.0.8
+
+You can use the :class:`UrlRequest` to make asynchronous requests on the
+web and get the result when the request is completed. The spirit is the
+same as the XHR object in Javascript.
+
+The content is also decoded if the Content-Type is
+application/json and the result automatically passed through json.loads.
+
+
+The syntax to create a request::
+
+    from kivy.network.urlrequest import UrlRequest
+    req = UrlRequest(url, on_success, on_redirect, on_failure, on_error,
+                     on_progress, req_body, req_headers, chunk_size,
+                     timeout, method, decode, debug, file_path, ca_file,
+                     verify)
+
+
+Only the first argument is mandatory: the rest are optional.
+By default, a "GET" request will be sent. If the :attr:`UrlRequest.req_body` is
+not None, a "POST" request will be sent. It's up to you to adjust
+:attr:`UrlRequest.req_headers` to suit your requirements and the response
+to the request will be accessible as the parameter called "result" on
+the callback function of the on_success event.
+
+
+Example of fetching JSON::
+
+    def got_json(req, result):
+        for key, value in req.resp_headers.items():
+            print('{}: {}'.format(key, value))
+
+    req = UrlRequest('https://httpbin.org/headers', got_json)
+
+Example of Posting data (adapted from httplib example)::
+
+    import urllib
+
+    def bug_posted(req, result):
+        print('Our bug is posted!')
+        print(result)
+
+    params = urllib.urlencode({'@number': 12524, '@type': 'issue',
+        '@action': 'show'})
+    headers = {'Content-type': 'application/x-www-form-urlencoded',
+              'Accept': 'text/plain'}
+    req = UrlRequest('bugs.python.org', on_success=bug_posted, req_body=params,
+            req_headers=headers)
+
+If you want a synchronous request, you can call the wait() method.
+
+'''
+
+from base64 import b64encode
+from collections import deque
+from threading import Thread, Event
+from json import loads
+from time import sleep
+from kivy.compat import PY2
+from kivy.config import Config
+
+if PY2:
+    from httplib import HTTPConnection
+    from urlparse import urlparse, urlunparse
+else:
+    from http.client import HTTPConnection
+    from urllib.parse import urlparse, urlunparse
+
+try:
+    import ssl
+
+    HTTPSConnection = None
+    if PY2:
+        from httplib import HTTPSConnection
+    else:
+        from http.client import HTTPSConnection
+except ImportError:
+    # depending the platform, if openssl support wasn't compiled before python,
+    # this class is not available.
+    pass
+
+from kivy.clock import Clock
+from kivy.weakmethod import WeakMethod
+from kivy.logger import Logger
+from kivy.utils import platform
+
+
+# list to save UrlRequest and prevent GC on un-referenced objects
+g_requests = []
+
+
+class UrlRequest(Thread):
+    '''A UrlRequest. See module documentation for usage.
+
+    .. versionchanged:: 1.5.1
+        Add `debug` parameter
+
+    .. versionchanged:: 1.0.10
+        Add `method` parameter
+
+    .. versionchanged:: 1.8.0
+
+        Parameter `decode` added.
+        Parameter `file_path` added.
+        Parameter `on_redirect` added.
+        Parameter `on_failure` added.
+
+    .. versionchanged:: 1.9.1
+
+        Parameter `ca_file` added.
+        Parameter `verify` added.
+
+    .. versionchanged:: 1.10.0
+
+        Parameters `proxy_host`, `proxy_port` and `proxy_headers` added.
+
+    .. versionchanged:: 1.11.0
+
+        Parameters `on_cancel` added.
+
+    :Parameters:
+        `url`: str
+            Complete url string to call.
+        `on_success`: callback(request, result)
+            Callback function to call when the result has been fetched.
+        `on_redirect`: callback(request, result)
+            Callback function to call if the server returns a Redirect.
+        `on_failure`: callback(request, result)
+            Callback function to call if the server returns a Client or
+            Server Error.
+        `on_error`: callback(request, error)
+            Callback function to call if an error occurs.
+        `on_progress`: callback(request, current_size, total_size)
+            Callback function that will be called to report progression of the
+            download. `total_size` might be -1 if no Content-Length has been
+            reported in the http response.
+            This callback will be called after each `chunk_size` is read.
+        `on_cancel`: callback(request)
+            Callback function to call if user requested to cancel the download
+            operation via the .cancel() method.
+        `req_body`: str, defaults to None
+            Data to sent in the request. If it's not None, a POST will be done
+            instead of a GET.
+        `req_headers`: dict, defaults to None
+            Custom headers to add to the request.
+        `chunk_size`: int, defaults to 8192
+            Size of each chunk to read, used only when `on_progress` callback
+            has been set. If you decrease it too much, a lot of on_progress
+            callbacks will be fired and will slow down your download. If you
+            want to have the maximum download speed, increase the chunk_size
+            or don't use ``on_progress``.
+        `timeout`: int, defaults to None
+            If set, blocking operations will timeout after this many seconds.
+        `method`: str, defaults to 'GET' (or 'POST' if ``body`` is specified)
+            The HTTP method to use.
+        `decode`: bool, defaults to True
+            If False, skip decoding of the response.
+        `debug`: bool, defaults to False
+            If True, it will use the Logger.debug to print information
+            about url access/progression/errors.
+        `file_path`: str, defaults to None
+            If set, the result of the UrlRequest will be written to this path
+            instead of in memory.
+        `ca_file`: str, defaults to None
+            Indicates a SSL CA certificate file path to validate HTTPS
+            certificates against
+        `verify`: bool, defaults to True
+            If False, disables SSL CA certificate verification
+        `proxy_host`: str, defaults to None
+            If set, the proxy host to use for this connection.
+        `proxy_port`: int, defaults to None
+            If set, and `proxy_host` is also set, the port to use for
+            connecting to the proxy server.
+        `proxy_headers`: dict, defaults to None
+            If set, and `proxy_host` is also set, the headers to send to the
+            proxy server in the ``CONNECT`` request.
+    '''
+
+    def __init__(self, url, on_success=None, on_redirect=None,
+                 on_failure=None, on_error=None, on_progress=None,
+                 req_body=None, req_headers=None, chunk_size=8192,
+                 timeout=None, method=None, decode=True, debug=False,
+                 file_path=None, ca_file=None, verify=True, proxy_host=None,
+                 proxy_port=None, proxy_headers=None, user_agent=None,
+                 on_cancel=None, cookies=None):
+        super(UrlRequest, self).__init__()
+        self._queue = deque()
+        self._trigger_result = Clock.create_trigger(self._dispatch_result, 0)
+        self.daemon = True
+        self.on_success = WeakMethod(on_success) if on_success else None
+        self.on_redirect = WeakMethod(on_redirect) if on_redirect else None
+        self.on_failure = WeakMethod(on_failure) if on_failure else None
+        self.on_error = WeakMethod(on_error) if on_error else None
+        self.on_progress = WeakMethod(on_progress) if on_progress else None
+        self.on_cancel = WeakMethod(on_cancel) if on_cancel else None
+        self.decode = decode
+        self.file_path = file_path
+        self._debug = debug
+        self._result = None
+        self._error = None
+        self._is_finished = False
+        self._resp_status = None
+        self._resp_headers = None
+        self._resp_length = -1
+        self._chunk_size = chunk_size
+        self._timeout = timeout
+        self._method = method
+        self.verify = verify
+        self._proxy_host = proxy_host
+        self._proxy_port = proxy_port
+        self._proxy_headers = proxy_headers
+        self._cancel_event = Event()
+        self._user_agent = user_agent
+        self._cookies = cookies
+
+        if platform in ['android', 'ios']:
+            import certifi
+            self.ca_file = ca_file or certifi.where()
+        else:
+            self.ca_file = ca_file
+
+        #: Url of the request
+        self.url = url
+
+        #: Request body passed in __init__
+        self.req_body = req_body
+
+        #: Request headers passed in __init__
+        self.req_headers = req_headers
+
+        # save our request to prevent GC
+        g_requests.append(self)
+
+        self.start()
+
+    def run(self):
+        q = self._queue.appendleft
+        url = self.url
+        req_body = self.req_body
+        req_headers = self.req_headers or {}
+
+        user_agent = self._user_agent
+        cookies = self._cookies
+
+        if user_agent:
+            req_headers.setdefault('User-Agent', user_agent)
+
+        elif (
+            Config.has_section('network')
+            and 'useragent' in Config.items('network')
+        ):
+            useragent = Config.get('network', 'useragent')
+            req_headers.setdefault('User-Agent', useragent)
+
+        if cookies:
+            req_headers.setdefault("Cookie", cookies)
+
+        try:
+            result, resp = self._fetch_url(url, req_body, req_headers, q)
+            if self.decode:
+                result = self.decode_result(result, resp)
+        except Exception as e:
+            q(('error', None, e))
+        else:
+            if not self._cancel_event.is_set():
+                q(('success', resp, result))
+            else:
+                q(('killed', None, None))
+
+        # using trigger can result in a missed on_success event
+        self._trigger_result()
+
+        # clean ourself when the queue is empty
+        while len(self._queue):
+            sleep(.1)
+            self._trigger_result()
+
+        # ok, authorize the GC to clean us.
+        if self in g_requests:
+            g_requests.remove(self)
+
+    def _parse_url(self, url):
+        parse = urlparse(url)
+        host = parse.hostname
+        port = parse.port
+        userpass = None
+
+        # append user + pass to hostname if specified
+        if parse.username and parse.password:
+            userpass = {
+                "Authorization": "Basic {}".format(b64encode(
+                    "{}:{}".format(
+                        parse.username,
+                        parse.password
+                    ).encode('utf-8')
+                ).decode('utf-8'))
+            }
+
+        return host, port, userpass, parse
+
+    def _fetch_url(self, url, body, headers, q):
+        # Parse and fetch the current url
+        trigger = self._trigger_result
+        chunk_size = self._chunk_size
+        report_progress = self.on_progress is not None
+        timeout = self._timeout
+        file_path = self.file_path
+        ca_file = self.ca_file
+        verify = self.verify
+
+        if self._debug:
+            Logger.debug('UrlRequest: {0} Fetch url <{1}>'.format(
+                id(self), url))
+            Logger.debug('UrlRequest: {0} - body: {1}'.format(
+                id(self), body))
+            Logger.debug('UrlRequest: {0} - headers: {1}'.format(
+                id(self), headers))
+
+        # parse url
+        host, port, userpass, parse = self._parse_url(url)
+        if userpass and not headers:
+            headers = userpass
+        elif userpass and headers:
+            key = list(userpass.keys())[0]
+            headers[key] = userpass[key]
+
+        # translate scheme to connection class
+        cls = self.get_connection_for_scheme(parse.scheme)
+
+        # reconstruct path to pass on the request
+        path = parse.path
+        if parse.params:
+            path += ';' + parse.params
+        if parse.query:
+            path += '?' + parse.query
+        if parse.fragment:
+            path += '#' + parse.fragment
+
+        # create connection instance
+        args = {}
+        if timeout is not None:
+            args['timeout'] = timeout
+
+        if (ca_file is not None and hasattr(ssl, 'create_default_context') and
+                parse.scheme == 'https'):
+            ctx = ssl.create_default_context(cafile=ca_file)
+            ctx.verify_mode = ssl.CERT_REQUIRED
+            args['context'] = ctx
+
+        if not verify and parse.scheme == 'https' and (
+            hasattr(ssl, 'create_default_context')):
+            ctx = ssl.create_default_context()
+            ctx.check_hostname = False
+            ctx.verify_mode = ssl.CERT_NONE
+            args['context'] = ctx
+
+        if self._proxy_host:
+            Logger.debug('UrlRequest: {0} - proxy via {1}:{2}'.format(
+                id(self), self._proxy_host, self._proxy_port
+            ))
+            req = cls(self._proxy_host, self._proxy_port, **args)
+            if parse.scheme == 'https':
+                req.set_tunnel(host, port, self._proxy_headers)
+            else:
+                path = urlunparse(parse)
+        else:
+            req = cls(host, port, **args)
+
+        # send request
+        method = self._method
+        if method is None:
+            method = 'GET' if body is None else 'POST'
+        req.request(method, path, body, headers or {})
+
+        # read header
+        resp = req.getresponse()
+
+        # read content
+        if report_progress or file_path is not None:
+            try:
+                total_size = int(resp.getheader('content-length'))
+            except:
+                total_size = -1
+
+            # before starting the download, send a fake progress to permit the
+            # user to initialize his ui
+            if report_progress:
+                q(('progress', resp, (0, total_size)))
+
+            def get_chunks(fd=None):
+                bytes_so_far = 0
+                result = b''
+                while 1:
+                    chunk = resp.read(chunk_size)
+                    if not chunk:
+                        break
+
+                    if fd:
+                        fd.write(chunk)
+                    else:
+                        result += chunk
+
+                    bytes_so_far += len(chunk)
+                    # report progress to user
+                    if report_progress:
+                        q(('progress', resp, (bytes_so_far, total_size)))
+                        trigger()
+                    if self._cancel_event.is_set():
+                        break
+                return bytes_so_far, result
+
+            if file_path is not None:
+                with open(file_path, 'wb') as fd:
+                    bytes_so_far, result = get_chunks(fd)
+            else:
+                bytes_so_far, result = get_chunks()
+
+            # ensure that results are dispatched for the last chunk,
+            # avoid trigger
+            if report_progress:
+                q(('progress', resp, (bytes_so_far, total_size)))
+                trigger()
+        else:
+            result = resp.read()
+            try:
+                if isinstance(result, bytes):
+                    result = result.decode('utf-8')
+            except UnicodeDecodeError:
+                # if it's an image? decoding would not work
+                pass
+        req.close()
+
+        # return everything
+        return result, resp
+
+    def get_connection_for_scheme(self, scheme):
+        '''Return the Connection class for a particular scheme.
+        This is an internal function that can be expanded to support custom
+        schemes.
+
+        Actual supported schemes: http, https.
+        '''
+        if scheme == 'http':
+            return HTTPConnection
+        elif scheme == 'https' and HTTPSConnection is not None:
+            return HTTPSConnection
+        else:
+            raise Exception('No class for scheme %s' % scheme)
+
+    def decode_result(self, result, resp):
+        '''Decode the result fetched from url according to his Content-Type.
+        Currently supports only application/json.
+        '''
+        # Entry to decode url from the content type.
+        # For example, if the content type is a json, it will be automatically
+        # decoded.
+        content_type = resp.getheader('Content-Type', None)
+        if content_type is not None:
+            ct = content_type.split(';')[0]
+            if ct == 'application/json':
+                if isinstance(result, bytes):
+                    result = result.decode('utf-8')
+                try:
+                    return loads(result)
+                except:
+                    return result
+
+        return result
+
+    def _dispatch_result(self, dt):
+        while True:
+            # Read the result pushed on the queue, and dispatch to the client
+            try:
+                result, resp, data = self._queue.pop()
+            except IndexError:
+                return
+            if resp:
+                # Small workaround in order to prevent the situation mentioned
+                # in the comment below
+                final_cookies = ""
+                parsed_headers = []
+                for key, value in resp.getheaders():
+                    if key == "Set-Cookie":
+                        final_cookies += "{};".format(value)
+                    else:
+                        parsed_headers.append((key, value))
+                parsed_headers.append(("Set-Cookie", final_cookies[:-1]))
+
+                # XXX usage of dict can be dangerous if multiple headers
+                # are set even if it's invalid. But it look like it's ok
+                # ?  http://stackoverflow.com/questions/2454494/..
+                # ..urllib2-multiple-set-cookie-headers-in-response
+                self._resp_headers = dict(parsed_headers)
+                self._resp_status = resp.status
+            if result == 'success':
+                status_class = resp.status // 100
+
+                if status_class in (1, 2):
+                    if self._debug:
+                        Logger.debug('UrlRequest: {0} Download finished with'
+                                     ' {1} datalen'.format(id(self),
+                                                           len(data)))
+                    self._is_finished = True
+                    self._result = data
+                    if self.on_success:
+                        func = self.on_success()
+                        if func:
+                            func(self, data)
+
+                elif status_class == 3:
+                    if self._debug:
+                        Logger.debug('UrlRequest: {} Download '
+                                     'redirected'.format(id(self)))
+                    self._is_finished = True
+                    self._result = data
+                    if self.on_redirect:
+                        func = self.on_redirect()
+                        if func:
+                            func(self, data)
+
+                elif status_class in (4, 5):
+                    if self._debug:
+                        Logger.debug('UrlRequest: {} Download failed with '
+                                     'http error {}'.format(id(self),
+                                                            resp.status))
+                    self._is_finished = True
+                    self._result = data
+                    if self.on_failure:
+                        func = self.on_failure()
+                        if func:
+                            func(self, data)
+
+            elif result == 'error':
+                if self._debug:
+                    Logger.debug('UrlRequest: {0} Download error '
+                                 '<{1}>'.format(id(self), data))
+                self._is_finished = True
+                self._error = data
+                if self.on_error:
+                    func = self.on_error()
+                    if func:
+                        func(self, data)
+
+            elif result == 'progress':
+                if self._debug:
+                    Logger.debug('UrlRequest: {0} Download progress '
+                                 '{1}'.format(id(self), data))
+                if self.on_progress:
+                    func = self.on_progress()
+                    if func:
+                        func(self, data[0], data[1])
+
+            elif result == 'killed':
+                if self._debug:
+                    Logger.debug('UrlRequest: Cancelled by user')
+                if self.on_cancel:
+                    func = self.on_cancel()
+                    if func:
+                        func(self)
+
+            else:
+                assert(0)
+
+    @property
+    def is_finished(self):
+        '''Return True if the request has finished, whether it's a
+        success or a failure.
+        '''
+        return self._is_finished
+
+    @property
+    def result(self):
+        '''Return the result of the request.
+        This value is not determined until the request is finished.
+        '''
+        return self._result
+
+    @property
+    def resp_headers(self):
+        '''If the request has been completed, return a dictionary containing
+        the headers of the response. Otherwise, it will return None.
+        '''
+        return self._resp_headers
+
+    @property
+    def resp_status(self):
+        '''Return the status code of the response if the request is complete,
+        otherwise return None.
+        '''
+        return self._resp_status
+
+    @property
+    def error(self):
+        '''Return the error of the request.
+        This value is not determined until the request is completed.
+        '''
+        return self._error
+
+    @property
+    def chunk_size(self):
+        '''Return the size of a chunk, used only in "progress" mode (when
+        on_progress callback is set.)
+        '''
+        return self._chunk_size
+
+    def wait(self, delay=0.5):
+        '''Wait for the request to finish (until :attr:`resp_status` is not
+        None)
+
+        .. note::
+            This method is intended to be used in the main thread, and the
+            callback will be dispatched from the same thread
+            from which you're calling.
+
+        .. versionadded:: 1.1.0
+        '''
+        while self.resp_status is None:
+            self._dispatch_result(delay)
+            sleep(delay)
+
+    def cancel(self):
+        '''Cancel the current request. It will be aborted, and the result
+        will not be dispatched. Once cancelled, the callback on_cancel will
+        be called.
+
+        .. versionadded:: 1.11.0
+        '''
+        self._cancel_event.set()
+
+
+if __name__ == '__main__':
+
+    from pprint import pprint
+
+    def on_success(req, result):
+        pprint('Got the result:')
+        pprint(result)
+
+    def on_error(req, error):
+        pprint('Got an error:')
+        pprint(error)
+
+    Clock.start_clock()
+    req = UrlRequest('https://en.wikipedia.org/w/api.php?format'
+        '=json&action=query&titles=Kivy&prop=revisions&rvprop=content',
+        on_success, on_error)
+    while not req.is_finished:
+        sleep(1)
+        Clock.tick()
+    Clock.stop_clock()
+
+    print('result =', req.result)
+    print('error =', req.error)