| """HTTP/1.1 client library |
| |
| <intro stuff goes here> |
| <other stuff, too> |
| |
| HTTPConnection go through a number of "states", which defines when a client |
| may legally make another request or fetch the response for a particular |
| request. This diagram details these state transitions: |
| |
| (null) |
| | |
| | HTTPConnection() |
| v |
| Idle |
| | |
| | putrequest() |
| v |
| Request-started |
| | |
| | ( putheader() )* endheaders() |
| v |
| Request-sent |
| | |
| | response = getresponse() |
| v |
| Unread-response [Response-headers-read] |
| |\____________________ |
| | | |
| | response.read() | putrequest() |
| v v |
| Idle Req-started-unread-response |
| ______/| |
| / | |
| response.read() | | ( putheader() )* endheaders() |
| v v |
| Request-started Req-sent-unread-response |
| | |
| | response.read() |
| v |
| Request-sent |
| |
| This diagram presents the following rules: |
| -- a second request may not be started until {response-headers-read} |
| -- a response [object] cannot be retrieved until {request-sent} |
| -- there is no differentiation between an unread response body and a |
| partially read response body |
| |
| Note: this enforcement is applied by the HTTPConnection class. The |
| HTTPResponse class does not enforce this state machine, which |
| implies sophisticated clients may accelerate the request/response |
| pipeline. Caution should be taken, though: accelerating the states |
| beyond the above pattern may imply knowledge of the server's |
| connection-close behavior for certain requests. For example, it |
| is impossible to tell whether the server will close the connection |
| UNTIL the response headers have been read; this means that further |
| requests cannot be placed into the pipeline until it is known that |
| the server will NOT be closing the connection. |
| |
| Logical State __state __response |
| ------------- ------- ---------- |
| Idle _CS_IDLE None |
| Request-started _CS_REQ_STARTED None |
| Request-sent _CS_REQ_SENT None |
| Unread-response _CS_IDLE <response_class> |
| Req-started-unread-response _CS_REQ_STARTED <response_class> |
| Req-sent-unread-response _CS_REQ_SENT <response_class> |
| """ |
| |
| import errno |
| import mimetools |
| import socket |
| from urlparse import urlsplit |
| |
| try: |
| from cStringIO import StringIO |
| except ImportError: |
| from StringIO import StringIO |
| |
| __all__ = ["HTTP", "HTTPResponse", "HTTPConnection", "HTTPSConnection", |
| "HTTPException", "NotConnected", "UnknownProtocol", |
| "UnknownTransferEncoding", "UnimplementedFileMode", |
| "IncompleteRead", "InvalidURL", "ImproperConnectionState", |
| "CannotSendRequest", "CannotSendHeader", "ResponseNotReady", |
| "BadStatusLine", "error"] |
| |
| HTTP_PORT = 80 |
| HTTPS_PORT = 443 |
| |
| _UNKNOWN = 'UNKNOWN' |
| |
| # connection states |
| _CS_IDLE = 'Idle' |
| _CS_REQ_STARTED = 'Request-started' |
| _CS_REQ_SENT = 'Request-sent' |
| |
| class HTTPMessage(mimetools.Message): |
| |
| def addheader(self, key, value): |
| """Add header for field key handling repeats.""" |
| prev = self.dict.get(key) |
| if prev is None: |
| self.dict[key] = value |
| else: |
| combined = ", ".join((prev, value)) |
| self.dict[key] = combined |
| |
| def addcontinue(self, key, more): |
| """Add more field data from a continuation line.""" |
| prev = self.dict[key] |
| self.dict[key] = prev + "\n " + more |
| |
| def readheaders(self): |
| """Read header lines. |
| |
| Read header lines up to the entirely blank line that terminates them. |
| The (normally blank) line that ends the headers is skipped, but not |
| included in the returned list. If a non-header line ends the headers, |
| (which is an error), an attempt is made to backspace over it; it is |
| never included in the returned list. |
| |
| The variable self.status is set to the empty string if all went well, |
| otherwise it is an error message. The variable self.headers is a |
| completely uninterpreted list of lines contained in the header (so |
| printing them will reproduce the header exactly as it appears in the |
| file). |
| |
| If multiple header fields with the same name occur, they are combined |
| according to the rules in RFC 2616 sec 4.2: |
| |
| Appending each subsequent field-value to the first, each separated |
| by a comma. The order in which header fields with the same field-name |
| are received is significant to the interpretation of the combined |
| field value. |
| """ |
| # XXX The implementation overrides the readheaders() method of |
| # rfc822.Message. The base class design isn't amenable to |
| # customized behavior here so the method here is a copy of the |
| # base class code with a few small changes. |
| |
| self.dict = {} |
| self.unixfrom = '' |
| self.headers = hlist = [] |
| self.status = '' |
| headerseen = "" |
| firstline = 1 |
| startofline = unread = tell = None |
| if hasattr(self.fp, 'unread'): |
| unread = self.fp.unread |
| elif self.seekable: |
| tell = self.fp.tell |
| while True: |
| if tell: |
| try: |
| startofline = tell() |
| except IOError: |
| startofline = tell = None |
| self.seekable = 0 |
| line = self.fp.readline() |
| if not line: |
| self.status = 'EOF in headers' |
| break |
| # Skip unix From name time lines |
| if firstline and line.startswith('From '): |
| self.unixfrom = self.unixfrom + line |
| continue |
| firstline = 0 |
| if headerseen and line[0] in ' \t': |
| # XXX Not sure if continuation lines are handled properly |
| # for http and/or for repeating headers |
| # It's a continuation line. |
| hlist.append(line) |
| self.addcontinue(headerseen, line.strip()) |
| continue |
| elif self.iscomment(line): |
| # It's a comment. Ignore it. |
| continue |
| elif self.islast(line): |
| # Note! No pushback here! The delimiter line gets eaten. |
| break |
| headerseen = self.isheader(line) |
| if headerseen: |
| # It's a legal header line, save it. |
| hlist.append(line) |
| self.addheader(headerseen, line[len(headerseen)+1:].strip()) |
| continue |
| else: |
| # It's not a header line; throw it back and stop here. |
| if not self.dict: |
| self.status = 'No headers' |
| else: |
| self.status = 'Non-header line where header expected' |
| # Try to undo the read. |
| if unread: |
| unread(line) |
| elif tell: |
| self.fp.seek(startofline) |
| else: |
| self.status = self.status + '; bad seek' |
| break |
| |
| class HTTPResponse: |
| |
| # strict: If true, raise BadStatusLine if the status line can't be |
| # parsed as a valid HTTP/1.0 or 1.1 status line. By default it is |
| # false because it prevents clients from talking to HTTP/0.9 |
| # servers. Note that a response with a sufficiently corrupted |
| # status line will look like an HTTP/0.9 response. |
| |
| # See RFC 2616 sec 19.6 and RFC 1945 sec 6 for details. |
| |
| def __init__(self, sock, debuglevel=0, strict=0, method=None): |
| self.fp = sock.makefile('rb', 0) |
| self.debuglevel = debuglevel |
| self.strict = strict |
| self._method = method |
| |
| self.msg = None |
| |
| # from the Status-Line of the response |
| self.version = _UNKNOWN # HTTP-Version |
| self.status = _UNKNOWN # Status-Code |
| self.reason = _UNKNOWN # Reason-Phrase |
| |
| self.chunked = _UNKNOWN # is "chunked" being used? |
| self.chunk_left = _UNKNOWN # bytes left to read in current chunk |
| self.length = _UNKNOWN # number of bytes left in response |
| self.will_close = _UNKNOWN # conn will close at end of response |
| |
| def _read_status(self): |
| # Initialize with Simple-Response defaults |
| line = self.fp.readline() |
| if self.debuglevel > 0: |
| print "reply:", repr(line) |
| try: |
| [version, status, reason] = line.split(None, 2) |
| except ValueError: |
| try: |
| [version, status] = line.split(None, 1) |
| reason = "" |
| except ValueError: |
| # empty version will cause next test to fail and status |
| # will be treated as 0.9 response. |
| version = "" |
| if not version.startswith('HTTP/'): |
| if self.strict: |
| self.close() |
| raise BadStatusLine(line) |
| else: |
| # assume it's a Simple-Response from an 0.9 server |
| self.fp = LineAndFileWrapper(line, self.fp) |
| return "HTTP/0.9", 200, "" |
| |
| # The status code is a three-digit number |
| try: |
| status = int(status) |
| if status < 100 or status > 999: |
| raise BadStatusLine(line) |
| except ValueError: |
| raise BadStatusLine(line) |
| return version, status, reason |
| |
| def begin(self): |
| if self.msg is not None: |
| # we've already started reading the response |
| return |
| |
| # read until we get a non-100 response |
| while True: |
| version, status, reason = self._read_status() |
| if status != 100: |
| break |
| # skip the header from the 100 response |
| while True: |
| skip = self.fp.readline().strip() |
| if not skip: |
| break |
| if self.debuglevel > 0: |
| print "header:", skip |
| |
| self.status = status |
| self.reason = reason.strip() |
| if version == 'HTTP/1.0': |
| self.version = 10 |
| elif version.startswith('HTTP/1.'): |
| self.version = 11 # use HTTP/1.1 code for HTTP/1.x where x>=1 |
| elif version == 'HTTP/0.9': |
| self.version = 9 |
| else: |
| raise UnknownProtocol(version) |
| |
| if self.version == 9: |
| self.chunked = 0 |
| self.will_close = 1 |
| self.msg = HTTPMessage(StringIO()) |
| return |
| |
| self.msg = HTTPMessage(self.fp, 0) |
| if self.debuglevel > 0: |
| for hdr in self.msg.headers: |
| print "header:", hdr, |
| |
| # don't let the msg keep an fp |
| self.msg.fp = None |
| |
| # are we using the chunked-style of transfer encoding? |
| tr_enc = self.msg.getheader('transfer-encoding') |
| if tr_enc and tr_enc.lower() == "chunked": |
| self.chunked = 1 |
| self.chunk_left = None |
| else: |
| self.chunked = 0 |
| |
| # will the connection close at the end of the response? |
| self.will_close = self._check_close() |
| |
| # do we have a Content-Length? |
| # NOTE: RFC 2616, S4.4, #3 says we ignore this if tr_enc is "chunked" |
| length = self.msg.getheader('content-length') |
| if length and not self.chunked: |
| try: |
| self.length = int(length) |
| except ValueError: |
| self.length = None |
| else: |
| self.length = None |
| |
| # does the body have a fixed length? (of zero) |
| if (status == 204 or # No Content |
| status == 304 or # Not Modified |
| 100 <= status < 200 or # 1xx codes |
| self._method == 'HEAD'): |
| self.length = 0 |
| |
| # if the connection remains open, and we aren't using chunked, and |
| # a content-length was not provided, then assume that the connection |
| # WILL close. |
| if not self.will_close and \ |
| not self.chunked and \ |
| self.length is None: |
| self.will_close = 1 |
| |
| def _check_close(self): |
| if self.version == 11: |
| # An HTTP/1.1 proxy is assumed to stay open unless |
| # explicitly closed. |
| conn = self.msg.getheader('connection') |
| if conn and conn.lower().find("close") >= 0: |
| return True |
| return False |
| |
| # An HTTP/1.0 response with a Connection header is probably |
| # the result of a confused proxy. Ignore it. |
| |
| # For older HTTP, Keep-Alive indiciates persistent connection. |
| if self.msg.getheader('keep-alive'): |
| return False |
| |
| # Proxy-Connection is a netscape hack. |
| pconn = self.msg.getheader('proxy-connection') |
| if pconn and pconn.lower().find("keep-alive") >= 0: |
| return False |
| |
| # otherwise, assume it will close |
| return True |
| |
| def close(self): |
| if self.fp: |
| self.fp.close() |
| self.fp = None |
| |
| def isclosed(self): |
| # NOTE: it is possible that we will not ever call self.close(). This |
| # case occurs when will_close is TRUE, length is None, and we |
| # read up to the last byte, but NOT past it. |
| # |
| # IMPLIES: if will_close is FALSE, then self.close() will ALWAYS be |
| # called, meaning self.isclosed() is meaningful. |
| return self.fp is None |
| |
| def read(self, amt=None): |
| if self.fp is None: |
| return '' |
| |
| if self.chunked: |
| return self._read_chunked(amt) |
| |
| if amt is None: |
| # unbounded read |
| if self.will_close: |
| s = self.fp.read() |
| else: |
| s = self._safe_read(self.length) |
| self.close() # we read everything |
| return s |
| |
| if self.length is not None: |
| if amt > self.length: |
| # clip the read to the "end of response" |
| amt = self.length |
| self.length -= amt |
| |
| # we do not use _safe_read() here because this may be a .will_close |
| # connection, and the user is reading more bytes than will be provided |
| # (for example, reading in 1k chunks) |
| s = self.fp.read(amt) |
| |
| return s |
| |
| def _read_chunked(self, amt): |
| assert self.chunked != _UNKNOWN |
| chunk_left = self.chunk_left |
| value = '' |
| |
| # XXX This accumulates chunks by repeated string concatenation, |
| # which is not efficient as the number or size of chunks gets big. |
| while True: |
| if chunk_left is None: |
| line = self.fp.readline() |
| i = line.find(';') |
| if i >= 0: |
| line = line[:i] # strip chunk-extensions |
| chunk_left = int(line, 16) |
| if chunk_left == 0: |
| break |
| if amt is None: |
| value += self._safe_read(chunk_left) |
| elif amt < chunk_left: |
| value += self._safe_read(amt) |
| self.chunk_left = chunk_left - amt |
| return value |
| elif amt == chunk_left: |
| value += self._safe_read(amt) |
| self._safe_read(2) # toss the CRLF at the end of the chunk |
| self.chunk_left = None |
| return value |
| else: |
| value += self._safe_read(chunk_left) |
| amt -= chunk_left |
| |
| # we read the whole chunk, get another |
| self._safe_read(2) # toss the CRLF at the end of the chunk |
| chunk_left = None |
| |
| # read and discard trailer up to the CRLF terminator |
| ### note: we shouldn't have any trailers! |
| while True: |
| line = self.fp.readline() |
| if line == '\r\n': |
| break |
| |
| # we read everything; close the "file" |
| # XXX Shouldn't the client close the file? |
| self.close() |
| |
| return value |
| |
| def _safe_read(self, amt): |
| """Read the number of bytes requested, compensating for partial reads. |
| |
| Normally, we have a blocking socket, but a read() can be interrupted |
| by a signal (resulting in a partial read). |
| |
| Note that we cannot distinguish between EOF and an interrupt when zero |
| bytes have been read. IncompleteRead() will be raised in this |
| situation. |
| |
| This function should be used when <amt> bytes "should" be present for |
| reading. If the bytes are truly not available (due to EOF), then the |
| IncompleteRead exception can be used to detect the problem. |
| """ |
| s = '' |
| while amt > 0: |
| chunk = self.fp.read(amt) |
| if not chunk: |
| raise IncompleteRead(s) |
| s += chunk |
| amt -= len(chunk) |
| return s |
| |
| def getheader(self, name, default=None): |
| if self.msg is None: |
| raise ResponseNotReady() |
| return self.msg.getheader(name, default) |
| |
| |
| class HTTPConnection: |
| |
| _http_vsn = 11 |
| _http_vsn_str = 'HTTP/1.1' |
| |
| response_class = HTTPResponse |
| default_port = HTTP_PORT |
| auto_open = 1 |
| debuglevel = 0 |
| strict = 0 |
| |
| def __init__(self, host, port=None, strict=None): |
| self.sock = None |
| self._buffer = [] |
| self.__response = None |
| self.__state = _CS_IDLE |
| self._method = None |
| |
| self._set_hostport(host, port) |
| if strict is not None: |
| self.strict = strict |
| |
| def _set_hostport(self, host, port): |
| if port is None: |
| i = host.find(':') |
| if i >= 0: |
| try: |
| port = int(host[i+1:]) |
| except ValueError: |
| raise InvalidURL("nonnumeric port: '%s'" % host[i+1:]) |
| host = host[:i] |
| else: |
| port = self.default_port |
| self.host = host |
| self.port = port |
| |
| def set_debuglevel(self, level): |
| self.debuglevel = level |
| |
| def connect(self): |
| """Connect to the host and port specified in __init__.""" |
| msg = "getaddrinfo returns an empty list" |
| for res in socket.getaddrinfo(self.host, self.port, 0, |
| socket.SOCK_STREAM): |
| af, socktype, proto, canonname, sa = res |
| try: |
| self.sock = socket.socket(af, socktype, proto) |
| if self.debuglevel > 0: |
| print "connect: (%s, %s)" % (self.host, self.port) |
| self.sock.connect(sa) |
| except socket.error, msg: |
| if self.debuglevel > 0: |
| print 'connect fail:', (self.host, self.port) |
| if self.sock: |
| self.sock.close() |
| self.sock = None |
| continue |
| break |
| if not self.sock: |
| raise socket.error, msg |
| |
| def close(self): |
| """Close the connection to the HTTP server.""" |
| if self.sock: |
| self.sock.close() # close it manually... there may be other refs |
| self.sock = None |
| if self.__response: |
| self.__response.close() |
| self.__response = None |
| self.__state = _CS_IDLE |
| |
| def send(self, str): |
| """Send `str' to the server.""" |
| if self.sock is None: |
| if self.auto_open: |
| self.connect() |
| else: |
| raise NotConnected() |
| |
| # send the data to the server. if we get a broken pipe, then close |
| # the socket. we want to reconnect when somebody tries to send again. |
| # |
| # NOTE: we DO propagate the error, though, because we cannot simply |
| # ignore the error... the caller will know if they can retry. |
| if self.debuglevel > 0: |
| print "send:", repr(str) |
| try: |
| self.sock.sendall(str) |
| except socket.error, v: |
| if v[0] == 32: # Broken pipe |
| self.close() |
| raise |
| |
| def _output(self, s): |
| """Add a line of output to the current request buffer. |
| |
| Assumes that the line does *not* end with \\r\\n. |
| """ |
| self._buffer.append(s) |
| |
| def _send_output(self): |
| """Send the currently buffered request and clear the buffer. |
| |
| Appends an extra \\r\\n to the buffer. |
| """ |
| self._buffer.extend(("", "")) |
| msg = "\r\n".join(self._buffer) |
| del self._buffer[:] |
| self.send(msg) |
| |
| def putrequest(self, method, url, skip_host=0): |
| """Send a request to the server. |
| |
| `method' specifies an HTTP request method, e.g. 'GET'. |
| `url' specifies the object being requested, e.g. '/index.html'. |
| """ |
| |
| # check if a prior response has been completed |
| # XXX What if it hasn't? |
| if self.__response and self.__response.isclosed(): |
| self.__response = None |
| |
| # |
| # in certain cases, we cannot issue another request on this connection. |
| # this occurs when: |
| # 1) we are in the process of sending a request. (_CS_REQ_STARTED) |
| # 2) a response to a previous request has signalled that it is going |
| # to close the connection upon completion. |
| # 3) the headers for the previous response have not been read, thus |
| # we cannot determine whether point (2) is true. (_CS_REQ_SENT) |
| # |
| # if there is no prior response, then we can request at will. |
| # |
| # if point (2) is true, then we will have passed the socket to the |
| # response (effectively meaning, "there is no prior response"), and |
| # will open a new one when a new request is made. |
| # |
| # Note: if a prior response exists, then we *can* start a new request. |
| # We are not allowed to begin fetching the response to this new |
| # request, however, until that prior response is complete. |
| # |
| if self.__state == _CS_IDLE: |
| self.__state = _CS_REQ_STARTED |
| else: |
| raise CannotSendRequest() |
| |
| # Save the method we use, we need it later in the response phase |
| self._method = method |
| if not url: |
| url = '/' |
| str = '%s %s %s' % (method, url, self._http_vsn_str) |
| |
| self._output(str) |
| |
| if self._http_vsn == 11: |
| # Issue some standard headers for better HTTP/1.1 compliance |
| |
| if not skip_host: |
| # this header is issued *only* for HTTP/1.1 |
| # connections. more specifically, this means it is |
| # only issued when the client uses the new |
| # HTTPConnection() class. backwards-compat clients |
| # will be using HTTP/1.0 and those clients may be |
| # issuing this header themselves. we should NOT issue |
| # it twice; some web servers (such as Apache) barf |
| # when they see two Host: headers |
| |
| # If we need a non-standard port,include it in the |
| # header. If the request is going through a proxy, |
| # but the host of the actual URL, not the host of the |
| # proxy. |
| |
| netloc = '' |
| if url.startswith('http'): |
| nil, netloc, nil, nil, nil = urlsplit(url) |
| |
| if netloc: |
| self.putheader('Host', netloc.encode("idna")) |
| elif self.port == HTTP_PORT: |
| self.putheader('Host', self.host.encode("idna")) |
| else: |
| self.putheader('Host', "%s:%s" % (self.host.encode("idna"), self.port)) |
| |
| # note: we are assuming that clients will not attempt to set these |
| # headers since *this* library must deal with the |
| # consequences. this also means that when the supporting |
| # libraries are updated to recognize other forms, then this |
| # code should be changed (removed or updated). |
| |
| # we only want a Content-Encoding of "identity" since we don't |
| # support encodings such as x-gzip or x-deflate. |
| self.putheader('Accept-Encoding', 'identity') |
| |
| # we can accept "chunked" Transfer-Encodings, but no others |
| # NOTE: no TE header implies *only* "chunked" |
| #self.putheader('TE', 'chunked') |
| |
| # if TE is supplied in the header, then it must appear in a |
| # Connection header. |
| #self.putheader('Connection', 'TE') |
| |
| else: |
| # For HTTP/1.0, the server will assume "not chunked" |
| pass |
| |
| def putheader(self, header, value): |
| """Send a request header line to the server. |
| |
| For example: h.putheader('Accept', 'text/html') |
| """ |
| if self.__state != _CS_REQ_STARTED: |
| raise CannotSendHeader() |
| |
| str = '%s: %s' % (header, value) |
| self._output(str) |
| |
| def endheaders(self): |
| """Indicate that the last header line has been sent to the server.""" |
| |
| if self.__state == _CS_REQ_STARTED: |
| self.__state = _CS_REQ_SENT |
| else: |
| raise CannotSendHeader() |
| |
| self._send_output() |
| |
| def request(self, method, url, body=None, headers={}): |
| """Send a complete request to the server.""" |
| |
| try: |
| self._send_request(method, url, body, headers) |
| except socket.error, v: |
| # trap 'Broken pipe' if we're allowed to automatically reconnect |
| if v[0] != 32 or not self.auto_open: |
| raise |
| # try one more time |
| self._send_request(method, url, body, headers) |
| |
| def _send_request(self, method, url, body, headers): |
| # If headers already contains a host header, then define the |
| # optional skip_host argument to putrequest(). The check is |
| # harder because field names are case insensitive. |
| if 'Host' in (headers |
| or [k for k in headers.iterkeys() if k.lower() == "host"]): |
| self.putrequest(method, url, skip_host=1) |
| else: |
| self.putrequest(method, url) |
| |
| if body: |
| self.putheader('Content-Length', str(len(body))) |
| for hdr, value in headers.iteritems(): |
| self.putheader(hdr, value) |
| self.endheaders() |
| |
| if body: |
| self.send(body) |
| |
| def getresponse(self): |
| "Get the response from the server." |
| |
| # check if a prior response has been completed |
| if self.__response and self.__response.isclosed(): |
| self.__response = None |
| |
| # |
| # if a prior response exists, then it must be completed (otherwise, we |
| # cannot read this response's header to determine the connection-close |
| # behavior) |
| # |
| # note: if a prior response existed, but was connection-close, then the |
| # socket and response were made independent of this HTTPConnection |
| # object since a new request requires that we open a whole new |
| # connection |
| # |
| # this means the prior response had one of two states: |
| # 1) will_close: this connection was reset and the prior socket and |
| # response operate independently |
| # 2) persistent: the response was retained and we await its |
| # isclosed() status to become true. |
| # |
| if self.__state != _CS_REQ_SENT or self.__response: |
| raise ResponseNotReady() |
| |
| if self.debuglevel > 0: |
| response = self.response_class(self.sock, self.debuglevel, |
| strict=self.strict, |
| method=self._method) |
| else: |
| response = self.response_class(self.sock, strict=self.strict, |
| method=self._method) |
| |
| response.begin() |
| assert response.will_close != _UNKNOWN |
| self.__state = _CS_IDLE |
| |
| if response.will_close: |
| # this effectively passes the connection to the response |
| self.close() |
| else: |
| # remember this, so we can tell when it is complete |
| self.__response = response |
| |
| return response |
| |
| # The next several classes are used to define FakeSocket,a socket-like |
| # interface to an SSL connection. |
| |
| # The primary complexity comes from faking a makefile() method. The |
| # standard socket makefile() implementation calls dup() on the socket |
| # file descriptor. As a consequence, clients can call close() on the |
| # parent socket and its makefile children in any order. The underlying |
| # socket isn't closed until they are all closed. |
| |
| # The implementation uses reference counting to keep the socket open |
| # until the last client calls close(). SharedSocket keeps track of |
| # the reference counting and SharedSocketClient provides an constructor |
| # and close() method that call incref() and decref() correctly. |
| |
| class SharedSocket: |
| |
| def __init__(self, sock): |
| self.sock = sock |
| self._refcnt = 0 |
| |
| def incref(self): |
| self._refcnt += 1 |
| |
| def decref(self): |
| self._refcnt -= 1 |
| assert self._refcnt >= 0 |
| if self._refcnt == 0: |
| self.sock.close() |
| |
| def __del__(self): |
| self.sock.close() |
| |
| class SharedSocketClient: |
| |
| def __init__(self, shared): |
| self._closed = 0 |
| self._shared = shared |
| self._shared.incref() |
| self._sock = shared.sock |
| |
| def close(self): |
| if not self._closed: |
| self._shared.decref() |
| self._closed = 1 |
| self._shared = None |
| |
| class SSLFile(SharedSocketClient): |
| """File-like object wrapping an SSL socket.""" |
| |
| BUFSIZE = 8192 |
| |
| def __init__(self, sock, ssl, bufsize=None): |
| SharedSocketClient.__init__(self, sock) |
| self._ssl = ssl |
| self._buf = '' |
| self._bufsize = bufsize or self.__class__.BUFSIZE |
| |
| def _read(self): |
| buf = '' |
| # put in a loop so that we retry on transient errors |
| while True: |
| try: |
| buf = self._ssl.read(self._bufsize) |
| except socket.sslerror, err: |
| if (err[0] == socket.SSL_ERROR_WANT_READ |
| or err[0] == socket.SSL_ERROR_WANT_WRITE): |
| continue |
| if (err[0] == socket.SSL_ERROR_ZERO_RETURN |
| or err[0] == socket.SSL_ERROR_EOF): |
| break |
| raise |
| except socket.error, err: |
| if err[0] == errno.EINTR: |
| continue |
| if err[0] == errno.EBADF: |
| # XXX socket was closed? |
| break |
| raise |
| else: |
| break |
| return buf |
| |
| def read(self, size=None): |
| L = [self._buf] |
| avail = len(self._buf) |
| while size is None or avail < size: |
| s = self._read() |
| if s == '': |
| break |
| L.append(s) |
| avail += len(s) |
| all = "".join(L) |
| if size is None: |
| self._buf = '' |
| return all |
| else: |
| self._buf = all[size:] |
| return all[:size] |
| |
| def readline(self): |
| L = [self._buf] |
| self._buf = '' |
| while 1: |
| i = L[-1].find("\n") |
| if i >= 0: |
| break |
| s = self._read() |
| if s == '': |
| break |
| L.append(s) |
| if i == -1: |
| # loop exited because there is no more data |
| return "".join(L) |
| else: |
| all = "".join(L) |
| # XXX could do enough bookkeeping not to do a 2nd search |
| i = all.find("\n") + 1 |
| line = all[:i] |
| self._buf = all[i:] |
| return line |
| |
| class FakeSocket(SharedSocketClient): |
| |
| class _closedsocket: |
| def __getattr__(self, name): |
| raise error(9, 'Bad file descriptor') |
| |
| def __init__(self, sock, ssl): |
| sock = SharedSocket(sock) |
| SharedSocketClient.__init__(self, sock) |
| self._ssl = ssl |
| |
| def close(self): |
| SharedSocketClient.close(self) |
| self._sock = self.__class__._closedsocket() |
| |
| def makefile(self, mode, bufsize=None): |
| if mode != 'r' and mode != 'rb': |
| raise UnimplementedFileMode() |
| return SSLFile(self._shared, self._ssl, bufsize) |
| |
| def send(self, stuff, flags = 0): |
| return self._ssl.write(stuff) |
| |
| sendall = send |
| |
| def recv(self, len = 1024, flags = 0): |
| return self._ssl.read(len) |
| |
| def __getattr__(self, attr): |
| return getattr(self._sock, attr) |
| |
| |
| class HTTPSConnection(HTTPConnection): |
| "This class allows communication via SSL." |
| |
| default_port = HTTPS_PORT |
| |
| def __init__(self, host, port=None, key_file=None, cert_file=None, |
| strict=None): |
| HTTPConnection.__init__(self, host, port, strict) |
| self.key_file = key_file |
| self.cert_file = cert_file |
| |
| def connect(self): |
| "Connect to a host on a given (SSL) port." |
| |
| sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| sock.connect((self.host, self.port)) |
| realsock = sock |
| if hasattr(sock, "_sock"): |
| realsock = sock._sock |
| ssl = socket.ssl(realsock, self.key_file, self.cert_file) |
| self.sock = FakeSocket(sock, ssl) |
| |
| |
| class HTTP: |
| "Compatibility class with httplib.py from 1.5." |
| |
| _http_vsn = 10 |
| _http_vsn_str = 'HTTP/1.0' |
| |
| debuglevel = 0 |
| |
| _connection_class = HTTPConnection |
| |
| def __init__(self, host='', port=None, strict=None): |
| "Provide a default host, since the superclass requires one." |
| |
| # some joker passed 0 explicitly, meaning default port |
| if port == 0: |
| port = None |
| |
| # Note that we may pass an empty string as the host; this will throw |
| # an error when we attempt to connect. Presumably, the client code |
| # will call connect before then, with a proper host. |
| self._setup(self._connection_class(host, port, strict)) |
| |
| def _setup(self, conn): |
| self._conn = conn |
| |
| # set up delegation to flesh out interface |
| self.send = conn.send |
| self.putrequest = conn.putrequest |
| self.endheaders = conn.endheaders |
| self.set_debuglevel = conn.set_debuglevel |
| |
| conn._http_vsn = self._http_vsn |
| conn._http_vsn_str = self._http_vsn_str |
| |
| self.file = None |
| |
| def connect(self, host=None, port=None): |
| "Accept arguments to set the host/port, since the superclass doesn't." |
| |
| if host is not None: |
| self._conn._set_hostport(host, port) |
| self._conn.connect() |
| |
| def getfile(self): |
| "Provide a getfile, since the superclass' does not use this concept." |
| return self.file |
| |
| def putheader(self, header, *values): |
| "The superclass allows only one value argument." |
| self._conn.putheader(header, '\r\n\t'.join(values)) |
| |
| def getreply(self): |
| """Compat definition since superclass does not define it. |
| |
| Returns a tuple consisting of: |
| - server status code (e.g. '200' if all goes well) |
| - server "reason" corresponding to status code |
| - any RFC822 headers in the response from the server |
| """ |
| try: |
| response = self._conn.getresponse() |
| except BadStatusLine, e: |
| ### hmm. if getresponse() ever closes the socket on a bad request, |
| ### then we are going to have problems with self.sock |
| |
| ### should we keep this behavior? do people use it? |
| # keep the socket open (as a file), and return it |
| self.file = self._conn.sock.makefile('rb', 0) |
| |
| # close our socket -- we want to restart after any protocol error |
| self.close() |
| |
| self.headers = None |
| return -1, e.line, None |
| |
| self.headers = response.msg |
| self.file = response.fp |
| return response.status, response.reason, response.msg |
| |
| def close(self): |
| self._conn.close() |
| |
| # note that self.file == response.fp, which gets closed by the |
| # superclass. just clear the object ref here. |
| ### hmm. messy. if status==-1, then self.file is owned by us. |
| ### well... we aren't explicitly closing, but losing this ref will |
| ### do it |
| self.file = None |
| |
| if hasattr(socket, 'ssl'): |
| class HTTPS(HTTP): |
| """Compatibility with 1.5 httplib interface |
| |
| Python 1.5.2 did not have an HTTPS class, but it defined an |
| interface for sending http requests that is also useful for |
| https. |
| """ |
| |
| _connection_class = HTTPSConnection |
| |
| def __init__(self, host='', port=None, key_file=None, cert_file=None, |
| strict=None): |
| # provide a default host, pass the X509 cert info |
| |
| # urf. compensate for bad input. |
| if port == 0: |
| port = None |
| self._setup(self._connection_class(host, port, key_file, |
| cert_file, strict)) |
| |
| # we never actually use these for anything, but we keep them |
| # here for compatibility with post-1.5.2 CVS. |
| self.key_file = key_file |
| self.cert_file = cert_file |
| |
| |
| class HTTPException(Exception): |
| # Subclasses that define an __init__ must call Exception.__init__ |
| # or define self.args. Otherwise, str() will fail. |
| pass |
| |
| class NotConnected(HTTPException): |
| pass |
| |
| class InvalidURL(HTTPException): |
| pass |
| |
| class UnknownProtocol(HTTPException): |
| def __init__(self, version): |
| self.args = version, |
| self.version = version |
| |
| class UnknownTransferEncoding(HTTPException): |
| pass |
| |
| class UnimplementedFileMode(HTTPException): |
| pass |
| |
| class IncompleteRead(HTTPException): |
| def __init__(self, partial): |
| self.args = partial, |
| self.partial = partial |
| |
| class ImproperConnectionState(HTTPException): |
| pass |
| |
| class CannotSendRequest(ImproperConnectionState): |
| pass |
| |
| class CannotSendHeader(ImproperConnectionState): |
| pass |
| |
| class ResponseNotReady(ImproperConnectionState): |
| pass |
| |
| class BadStatusLine(HTTPException): |
| def __init__(self, line): |
| self.args = line, |
| self.line = line |
| |
| # for backwards compatibility |
| error = HTTPException |
| |
| class LineAndFileWrapper: |
| """A limited file-like object for HTTP/0.9 responses.""" |
| |
| # The status-line parsing code calls readline(), which normally |
| # get the HTTP status line. For a 0.9 response, however, this is |
| # actually the first line of the body! Clients need to get a |
| # readable file object that contains that line. |
| |
| def __init__(self, line, file): |
| self._line = line |
| self._file = file |
| self._line_consumed = 0 |
| self._line_offset = 0 |
| self._line_left = len(line) |
| |
| def __getattr__(self, attr): |
| return getattr(self._file, attr) |
| |
| def _done(self): |
| # called when the last byte is read from the line. After the |
| # call, all read methods are delegated to the underlying file |
| # object. |
| self._line_consumed = 1 |
| self.read = self._file.read |
| self.readline = self._file.readline |
| self.readlines = self._file.readlines |
| |
| def read(self, amt=None): |
| assert not self._line_consumed and self._line_left |
| if amt is None or amt > self._line_left: |
| s = self._line[self._line_offset:] |
| self._done() |
| if amt is None: |
| return s + self._file.read() |
| else: |
| return s + self._file.read(amt - len(s)) |
| else: |
| assert amt <= self._line_left |
| i = self._line_offset |
| j = i + amt |
| s = self._line[i:j] |
| self._line_offset = j |
| self._line_left -= amt |
| if self._line_left == 0: |
| self._done() |
| return s |
| |
| def readline(self): |
| s = self._line[self._line_offset:] |
| self._done() |
| return s |
| |
| def readlines(self, size=None): |
| L = [self._line[self._line_offset:]] |
| self._done() |
| if size is None: |
| return L + self._file.readlines() |
| else: |
| return L + self._file.readlines(size) |
| |
| def test(): |
| """Test this module. |
| |
| A hodge podge of tests collected here, because they have too many |
| external dependencies for the regular test suite. |
| """ |
| |
| import sys |
| import getopt |
| opts, args = getopt.getopt(sys.argv[1:], 'd') |
| dl = 0 |
| for o, a in opts: |
| if o == '-d': dl = dl + 1 |
| host = 'www.python.org' |
| selector = '/' |
| if args[0:]: host = args[0] |
| if args[1:]: selector = args[1] |
| h = HTTP() |
| h.set_debuglevel(dl) |
| h.connect(host) |
| h.putrequest('GET', selector) |
| h.endheaders() |
| status, reason, headers = h.getreply() |
| print 'status =', status |
| print 'reason =', reason |
| print "read", len(h.getfile().read()) |
| print |
| if headers: |
| for header in headers.headers: print header.strip() |
| print |
| |
| # minimal test that code to extract host from url works |
| class HTTP11(HTTP): |
| _http_vsn = 11 |
| _http_vsn_str = 'HTTP/1.1' |
| |
| h = HTTP11('www.python.org') |
| h.putrequest('GET', 'http://www.python.org/~jeremy/') |
| h.endheaders() |
| h.getreply() |
| h.close() |
| |
| if hasattr(socket, 'ssl'): |
| |
| for host, selector in (('sourceforge.net', '/projects/python'), |
| ): |
| print "https://%s%s" % (host, selector) |
| hs = HTTPS() |
| hs.set_debuglevel(dl) |
| hs.connect(host) |
| hs.putrequest('GET', selector) |
| hs.endheaders() |
| status, reason, headers = hs.getreply() |
| print 'status =', status |
| print 'reason =', reason |
| print "read", len(hs.getfile().read()) |
| print |
| if headers: |
| for header in headers.headers: print header.strip() |
| print |
| |
| if __name__ == '__main__': |
| test() |