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320 lines
12 KiB
Python
320 lines
12 KiB
Python
# Client for the DICT protocol (RFC2229)
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#
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# Copyright (C) 2002 John Goerzen
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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import socket, re
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version = '1.0'
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def dequote(str):
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"""Will remove single or double quotes from the start and end of a string
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and return the result."""
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quotechars = "'\""
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while len(str) and str[0] in quotechars:
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str = str[1:]
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while len(str) and str[-1] in quotechars:
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str = str[0:-1]
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return str
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def enquote(str):
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"""This function will put a string in double quotes, properly
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escaping any existing double quotes with a backslash. It will
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return the result."""
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return '"' + str.replace('"', "\\\"") + '"'
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class Connection:
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"""This class is used to establish a connection to a database server.
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You will usually use this as the first call into the dictclient library.
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Instantiating it takes two optional arguments: a hostname (a string)
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and a port (an int). The hostname defaults to localhost
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and the port to 2628, the port specified in RFC."""
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def __init__(self, hostname = 'localhost', port = 2628):
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self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.sock.connect((hostname, port))
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self.rfile = self.sock.makefile("rb")
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self.wfile = self.sock.makefile("wb", 0)
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self.saveconnectioninfo()
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def getresultcode(self):
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"""Generic function to get a result code. It will return a list
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consisting of two items: the integer result code and the text
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following. You will not usually use this function directly."""
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line = self.rfile.readline().decode('utf8').strip()
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if line.startswith('['):
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return [None, line]
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code, text = line.split(' ', 1)
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return [int(code), text]
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def get200result(self):
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"""Used when expecting a single line of text -- a 200-class
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result. Returns [intcode, remaindertext]"""
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code, text = self.getresultcode()
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if code < 200 or code >= 300:
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raise Exception, "Got '%s' when 200-class response expected" % \
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line
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return [code, text]
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def get100block(self):
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"""Used when expecting multiple lines of text -- gets the block
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part only. Does not get any codes or anything! Returns a string."""
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data = []
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while True:
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line = self.rfile.readline().decode('utf8').strip()
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if line == '.':
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break
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data.append(line)
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return "\n".join(data)
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def get100result(self):
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"""Used when expecting multiple lines of text, terminated by a period
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and a 200 code. Returns: [initialcode, [bodytext_1lineperentry],
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finalcode]"""
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code, text = self.getresultcode()
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if code < 100 or code >= 200:
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raise Exception, "Got '%s' when 100-class response expected" % \
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code
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bodylines = self.get100block().split("\n")
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code2 = self.get200result()[0]
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return [code, bodylines, code2]
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def get100dict(self):
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"""Used when expecting a dictionary of results. Will read from
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the initial 100 code, to a period and the 200 code."""
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dict = {}
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for line in self.get100result()[1]:
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key, val = line.split(' ', 1)
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dict[key] = dequote(val)
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return dict
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def saveconnectioninfo(self):
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"""Called by __init__ to handle the initial connection. Will
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save off the capabilities and messageid."""
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code, string = self.get200result()
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assert code == 220
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capstr, msgid = re.search('<(.*)> (<.*>)$', string).groups()
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self.capabilities = capstr.split('.')
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self.messageid = msgid
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def getcapabilities(self):
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"""Returns a list of the capabilities advertised by the server."""
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return self.capabilities
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def getmessageid(self):
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"""Returns the message id, including angle brackets."""
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return self.messageid
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def getdbdescs(self):
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"""Gets a dict of available databases. The key is the db name
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and the value is the db description. This command may generate
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network traffic!"""
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if hasattr(self, 'dbdescs'):
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return self.dbdescs
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self.sendcommand("SHOW DB")
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self.dbdescs = self.get100dict()
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return self.dbdescs
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def getstratdescs(self):
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"""Gets a dict of available strategies. The key is the strat
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name and the value is the strat description. This call may
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generate network traffic!"""
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if hasattr(self, 'stratdescs'):
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return self.stratdescs
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self.sendcommand("SHOW STRAT")
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self.stratdescs = self.get100dict()
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return self.stratdescs
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def getdbobj(self, dbname):
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"""Gets a Database object corresponding to the database name passed
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in. This function explicitly will *not* generate network traffic.
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If you have not yet run getdbdescs(), it will fail."""
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if not hasattr(self, 'dbobjs'):
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self.dbobjs = {}
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if dbname in self.dbobjs:
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return self.dbobjs[dbname]
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# We use self.dbdescs explicitly since we don't want to
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# generate net traffic with this request!
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if dbname != '*' and dbname != '!' and \
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not dbname in self.dbdescs.keys():
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raise Exception, "Invalid database name '%s'" % dbname
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self.dbobjs[dbname] = Database(self, dbname)
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return self.dbobjs[dbname]
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def sendcommand(self, command):
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"""Takes a command, without a newline character, and sends it to
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the server."""
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self.wfile.write(command.encode('ascii') + b"\n")
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def define(self, database, word):
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"""Returns a list of Definition objects for each matching
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definition. Parameters are the database name and the word
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to look up. This is one of the main functions you will use
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to interact with the server. Returns a list of Definition
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objects. If there are no matches, an empty list is returned.
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Note: database may be '*' which means to search all databases,
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or '!' which means to return matches from the first database that
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has a match."""
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self.getdbdescs() # Prime the cache
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if database != '*' and database != '!' and \
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not database in self.getdbdescs():
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raise Exception, "Invalid database '%s' specified" % database
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self.sendcommand("DEFINE " + enquote(database) + " " + enquote(word))
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code = self.getresultcode()[0]
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retval = []
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if code == 552:
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# No definitions.
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return []
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if code != 150:
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raise Exception, "Unknown code %d" % code
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while True:
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code, text = self.getresultcode()
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if code != 151 or code is None:
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break
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resultword, resultdb = re.search('^"(.+)" (\S+)', text).groups()
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defstr = self.get100block()
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retval.append(Definition(self, self.getdbobj(resultdb),
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resultword, defstr))
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return retval
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def match(self, database, strategy, word):
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"""Gets matches for a query. Arguments are database name,
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the strategy (see available ones in getstratdescs()), and the
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pattern/word to look for. Returns a list of Definition objects.
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If there is no match, an empty list is returned.
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Note: database may be '*' which means to search all databases,
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or '!' which means to return matches from the first database that
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has a match."""
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self.getstratdescs() # Prime the cache
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self.getdbdescs() # Prime the cache
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if not strategy in self.getstratdescs().keys():
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raise Exception, "Invalid strategy '%s'" % strategy
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if database != '*' and database != '!' and \
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not database in self.getdbdescs().keys():
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raise Exception, "Invalid database name '%s'" % database
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self.sendcommand("MATCH %s %s %s" % (enquote(database),
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enquote(strategy),
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enquote(word)))
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code = self.getresultcode()[0]
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if code == 552:
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# No Matches
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return []
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if code != 152:
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raise Exception, "Unexpected code %d" % code
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retval = []
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for matchline in self.get100block().split("\n"):
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matchdict, matchword = matchline.split(" ", 1)
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retval.append(Definition(self, self.getdbobj(matchdict),
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dequote(matchword)))
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if self.getresultcode()[0] != 250:
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raise Exception, "Unexpected end-of-list code %d" % code
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return retval
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class Database:
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"""An object corresponding to a particular database in a server."""
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def __init__(self, dictconn, dbname):
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"""Initialize the object -- requires a Connection object and
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a database name."""
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self.conn = dictconn
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self.name = dbname
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def getname(self):
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"""Returns the short name for this database."""
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return self.name
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def getdescription(self):
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if hasattr(self, 'description'):
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return self.description
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if self.getname() == '*':
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self.description = 'All Databases'
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elif self.getname() == '!':
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self.description = 'First matching database'
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else:
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self.description = self.conn.getdbdescs()[self.getname()]
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return self.description
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def getinfo(self):
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"""Returns a string of info describing this database."""
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if hasattr(self, 'info'):
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return self.info
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if self.getname() == '*':
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self.info = "This special database will search all databases on the system."
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elif self.getname() == '!':
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self.info = "This special database will return matches from the first matching database."
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else:
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self.conn.sendcommand("SHOW INFO " + self.name)
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self.info = "\n".join(self.conn.get100result()[1])
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return self.info
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def define(self, word):
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"""Get a definition from within this database.
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The argument, word, is the word to look up. The return value is the
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same as from Connection.define()."""
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return self.conn.define(self.getname(), word)
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def match(self, strategy, word):
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"""Get a match from within this database.
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The argument, word, is the word to look up. The return value is
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the same as from Connection.define()."""
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return self.conn.match(self.getname(), strategy, word)
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class Definition:
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"""An object corresponding to a single definition."""
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def __init__(self, dictconn, db, word, defstr = None):
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"""Instantiate the object. Requires: a Connection object,
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a Database object (NOT corresponding to '*' or '!' databases),
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a word. Optional: a definition string. If not supplied,
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it will be fetched if/when it is requested."""
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self.conn = dictconn
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self.db = db
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self.word = word
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self.defstr = defstr
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def getdb(self):
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"""Get the Database object corresponding to this definition."""
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return self.db
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def getdefstr(self):
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"""Get the definition string (the actual content) of this
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definition."""
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if not self.defstr:
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self.defstr = self.conn.define(self.getdb().getname(), self.word)[0].getdefstr()
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return self.defstr
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def getword(self):
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"""Get the word this object describes."""
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return self.word
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