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""" Dict client protocol implementation. @author: Pavel Pergamenshchik """ from twisted.protocols import basic from twisted.internet import defer, protocol from twisted.python import log from io import BytesIO def parseParam(line): """Chew one dqstring or atom from beginning of line and return (param, remaningline)""" if line == b'': return (None, b'') elif line[0:1] != b'"': # atom mode = 1 else: # dqstring mode = 2 res = b"" io = BytesIO(line) if mode == 2: # skip the opening quote io.read(1) while 1: a = io.read(1) if a == b'"': if mode == 2: io.read(1) # skip the separating space return (res, io.read()) elif a == b'\\': a = io.read(1) if a == b'': return (None, line) # unexpected end of string elif a == b'': if mode == 1: return (res, io.read()) else: return (None, line) # unexpected end of string elif a == b' ': if mode == 1: return (res, io.read()) res += a def makeAtom(line): """Munch a string into an 'atom'""" # FIXME: proper quoting return filter(lambda x: not (x in map(chr, range(33)+[34, 39, 92])), line) def makeWord(s): mustquote = range(33)+[34, 39, 92] result = [] for c in s: if ord(c) in mustquote: result.append(b"\\") result.append(c) s = b"".join(result) return s def parseText(line): if len(line) == 1 and line == b'.': return None else: if len(line) > 1 and line[0:2] == b'..': line = line[1:] return line class Definition: """A word definition""" def __init__(self, name, db, dbdesc, text): self.name = name self.db = db self.dbdesc = dbdesc self.text = text # list of strings not terminated by newline class DictClient(basic.LineReceiver): """dict (RFC2229) client""" data = None # multiline data MAX_LENGTH = 1024 state = None mode = None result = None factory = None def __init__(self): self.data = None self.result = None def connectionMade(self): self.state = "conn" self.mode = "command" def sendLine(self, line): """Throw up if the line is longer than 1022 characters""" if len(line) > self.MAX_LENGTH - 2: raise ValueError("DictClient tried to send a too long line") basic.LineReceiver.sendLine(self, line) def lineReceived(self, line): try: line = line.decode("utf-8") except UnicodeError: # garbage received, skip return if self.mode == "text": # we are receiving textual data code = "text" else: if len(line) < 4: log.msg("DictClient got invalid line from server -- %s" % line) self.protocolError("Invalid line from server") self.transport.LoseConnection() return code = int(line[:3]) line = line[4:] method = getattr(self, 'dictCode_%s_%s' % (code, self.state), self.dictCode_default) method(line) def dictCode_default(self, line): """Unknown message""" log.msg("DictClient got unexpected message from server -- %s" % line) self.protocolError("Unexpected server message") self.transport.loseConnection() def dictCode_221_ready(self, line): """We are about to get kicked off, do nothing""" pass def dictCode_220_conn(self, line): """Greeting message""" self.state = "ready" self.dictConnected() def dictCode_530_conn(self): self.protocolError("Access denied") self.transport.loseConnection() def dictCode_420_conn(self): self.protocolError("Server temporarily unavailable") self.transport.loseConnection() def dictCode_421_conn(self): self.protocolError("Server shutting down at operator request") self.transport.loseConnection() def sendDefine(self, database, word): """Send a dict DEFINE command""" assert self.state == "ready", "DictClient.sendDefine called when not in ready state" self.result = None # these two are just in case. In "ready" state, result and data self.data = None # should be None self.state = "define" command = "DEFINE %s %s" % (makeAtom(database.encode("UTF-8")), makeWord(word.encode("UTF-8"))) self.sendLine(command) def sendMatch(self, database, strategy, word): """Send a dict MATCH command""" assert self.state == "ready", "DictClient.sendMatch called when not in ready state" self.result = None self.data = None self.state = "match" command = "MATCH %s %s %s" % (makeAtom(database), makeAtom(strategy), makeAtom(word)) self.sendLine(command.encode("UTF-8")) def dictCode_550_define(self, line): """Invalid database""" self.mode = "ready" self.defineFailed("Invalid database") def dictCode_550_match(self, line): """Invalid database""" self.mode = "ready" self.matchFailed("Invalid database") def dictCode_551_match(self, line): """Invalid strategy""" self.mode = "ready" self.matchFailed("Invalid strategy") def dictCode_552_define(self, line): """No match""" self.mode = "ready" self.defineFailed("No match") def dictCode_552_match(self, line): """No match""" self.mode = "ready" self.matchFailed("No match") def dictCode_150_define(self, line): """n definitions retrieved""" self.result = [] def dictCode_151_define(self, line): """Definition text follows""" self.mode = "text" (word, line) = parseParam(line) (db, line) = parseParam(line) (dbdesc, line) = parseParam(line) if not (word and db and dbdesc): self.protocolError("Invalid server response") self.transport.loseConnection() else: self.result.append(Definition(word, db, dbdesc, [])) self.data = [] def dictCode_152_match(self, line): """n matches found, text follows""" self.mode = "text" self.result = [] self.data = [] def dictCode_text_define(self, line): """A line of definition text received""" res = parseText(line) if res == None: self.mode = "command" self.result[-1].text = self.data self.data = None else: self.data.append(line) def dictCode_text_match(self, line): """One line of match text received""" def l(s): p1, t = parseParam(s) p2, t = parseParam(t) return (p1, p2) res = parseText(line) if res == None: self.mode = "command" self.result = map(l, self.data) self.data = None else: self.data.append(line) def dictCode_250_define(self, line): """ok""" t = self.result self.result = None self.state = "ready" self.defineDone(t) def dictCode_250_match(self, line): """ok""" t = self.result self.result = None self.state = "ready" self.matchDone(t) def protocolError(self, reason): """override to catch unexpected dict protocol conditions""" pass def dictConnected(self): """override to be notified when the server is ready to accept commands""" pass def defineFailed(self, reason): """override to catch reasonable failure responses to DEFINE""" pass def defineDone(self, result): """override to catch successful DEFINE""" pass def matchFailed(self, reason): """override to catch resonable failure responses to MATCH""" pass def matchDone(self, result): """override to catch successful MATCH""" pass class InvalidResponse(Exception): pass class DictLookup(DictClient): """Utility class for a single dict transaction. To be used with DictLookupFactory""" def protocolError(self, reason): if not self.factory.done: self.factory.d.errback(InvalidResponse(reason)) self.factory.clientDone() def dictConnected(self): if self.factory.queryType == "define": apply(self.sendDefine, self.factory.param) elif self.factory.queryType == "match": apply(self.sendMatch, self.factory.param) def defineFailed(self, reason): self.factory.d.callback([]) self.factory.clientDone() self.transport.loseConnection() def defineDone(self, result): self.factory.d.callback(result) self.factory.clientDone() self.transport.loseConnection() def matchFailed(self, reason): self.factory.d.callback([]) self.factory.clientDone() self.transport.loseConnection() def matchDone(self, result): self.factory.d.callback(result) self.factory.clientDone() self.transport.loseConnection() class DictLookupFactory(protocol.ClientFactory): """Utility factory for a single dict transaction""" protocol = DictLookup done = None def __init__(self, queryType, param, d): self.queryType = queryType self.param = param self.d = d self.done = 0 def clientDone(self): """Called by client when done.""" self.done = 1 del self.d def clientConnectionFailed(self, connector, error): self.d.errback(error) def clientConnectionLost(self, connector, error): if not self.done: self.d.errback(error) def buildProtocol(self, addr): p = self.protocol() p.factory = self return p def define(host, port, database, word): """Look up a word using a dict server""" d = defer.Deferred() factory = DictLookupFactory("define", (database, word), d) from twisted.internet import reactor reactor.connectTCP(host, port, factory) return d def match(host, port, database, strategy, word): """Match a word using a dict server""" d = defer.Deferred() factory = DictLookupFactory("match", (database, strategy, word), d) from twisted.internet import reactor reactor.connectTCP(host, port, factory) return d