Added branch 1.0.
[wolnelektury.git] / apps / djangosphinx / apis / api275 / __init__.py
diff --git a/apps/djangosphinx/apis/api275/__init__.py b/apps/djangosphinx/apis/api275/__init__.py
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+#
+# $Id: sphinxapi.py 1216 2008-03-14 23:25:39Z shodan $
+#
+# Python version of Sphinx searchd client (Python API)
+#
+# Copyright (c) 2006-2008, Andrew Aksyonoff
+# Copyright (c) 2006, Mike Osadnik
+# All rights reserved
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License. You should have
+# received a copy of the GPL license along with this program; if you
+# did not, you can find it at http://www.gnu.org/
+#
+
+import sys
+import select
+import socket
+from struct import *
+
+
+# known searchd commands
+SEARCHD_COMMAND_SEARCH = 0
+SEARCHD_COMMAND_EXCERPT        = 1
+SEARCHD_COMMAND_UPDATE = 2
+SEARCHD_COMMAND_KEYWORDS= 3
+
+# current client-side command implementation versions
+VER_COMMAND_SEARCH             = 0x113
+VER_COMMAND_EXCERPT            = 0x100
+VER_COMMAND_UPDATE             = 0x101
+VER_COMMAND_KEYWORDS   = 0x100
+
+# known searchd status codes
+SEARCHD_OK                             = 0
+SEARCHD_ERROR                  = 1
+SEARCHD_RETRY                  = 2
+SEARCHD_WARNING                        = 3
+
+# known match modes
+SPH_MATCH_ALL                  = 0
+SPH_MATCH_ANY                  = 1
+SPH_MATCH_PHRASE               = 2
+SPH_MATCH_BOOLEAN              = 3
+SPH_MATCH_EXTENDED             = 4
+SPH_MATCH_FULLSCAN             = 5
+SPH_MATCH_EXTENDED2            = 6
+
+# known ranking modes (extended2 mode only)
+SPH_RANK_PROXIMITY_BM25        = 0 # default mode, phrase proximity major factor and BM25 minor one
+SPH_RANK_BM25                  = 1 # statistical mode, BM25 ranking only (faster but worse quality)
+SPH_RANK_NONE                  = 2 # no ranking, all matches get a weight of 1
+SPH_RANK_WORDCOUNT             = 3 # simple word-count weighting, rank is a weighted sum of per-field keyword occurence counts
+
+# known sort modes
+SPH_SORT_RELEVANCE             = 0
+SPH_SORT_ATTR_DESC             = 1
+SPH_SORT_ATTR_ASC              = 2
+SPH_SORT_TIME_SEGMENTS = 3
+SPH_SORT_EXTENDED              = 4
+SPH_SORT_EXPR                  = 5
+
+# known filter types
+SPH_FILTER_VALUES              = 0
+SPH_FILTER_RANGE               = 1
+SPH_FILTER_FLOATRANGE  = 2
+
+# known attribute types
+SPH_ATTR_NONE                  = 0
+SPH_ATTR_INTEGER               = 1
+SPH_ATTR_TIMESTAMP             = 2
+SPH_ATTR_ORDINAL               = 3
+SPH_ATTR_BOOL                  = 4
+SPH_ATTR_FLOAT                 = 5
+SPH_ATTR_MULTI                 = 0X40000000L
+
+# known grouping functions
+SPH_GROUPBY_DAY                        = 0
+SPH_GROUPBY_WEEK               = 1
+SPH_GROUPBY_MONTH              = 2
+SPH_GROUPBY_YEAR               = 3
+SPH_GROUPBY_ATTR               = 4
+
+
+class SphinxClient:
+       def __init__ (self):
+               """
+               Create a new client object, and fill defaults.
+               """
+               self._host                      = 'localhost'                                   # searchd host (default is "localhost")
+               self._port                      = 3312                                                  # searchd port (default is 3312)
+               self._offset            = 0                                                             # how much records to seek from result-set start (default is 0)
+               self._limit                     = 20                                                    # how much records to return from result-set starting at offset (default is 20)
+               self._mode                      = SPH_MATCH_ALL                                 # query matching mode (default is SPH_MATCH_ALL)
+               self._weights           = []                                                    # per-field weights (default is 1 for all fields)
+               self._sort                      = SPH_SORT_RELEVANCE                    # match sorting mode (default is SPH_SORT_RELEVANCE)
+               self._sortby            = ''                                                    # attribute to sort by (defualt is "")
+               self._min_id            = 0                                                             # min ID to match (default is 0)
+               self._max_id            = 0xFFFFFFFF                                    # max ID to match (default is UINT_MAX)
+               self._filters           = []                                                    # search filters
+               self._groupby           = ''                                                    # group-by attribute name
+               self._groupfunc         = SPH_GROUPBY_DAY                               # group-by function (to pre-process group-by attribute value with)
+               self._groupsort         = '@group desc'                                 # group-by sorting clause (to sort groups in result set with)
+               self._groupdistinct     = ''                                                    # group-by count-distinct attribute
+               self._maxmatches        = 1000                                                  # max matches to retrieve
+               self._cutoff            = 0                                                             # cutoff to stop searching at
+               self._retrycount        = 0                                                             # distributed retry count
+               self._retrydelay        = 0                                                             # distributed retry delay
+               self._anchor            = {}                                                    # geographical anchor point
+               self._indexweights      = {}                                                    # per-index weights
+               self._ranker            = SPH_RANK_PROXIMITY_BM25               # ranking mode
+               self._maxquerytime      = 0                                                             # max query time, milliseconds (default is 0, do not limit)
+               self._fieldweights      = {}                                                    # per-field-name weights
+               self._error                     = ''                                                    # last error message
+               self._warning           = ''                                                    # last warning message
+               self._reqs                      = []                                                    # requests array for multi-query
+               return
+
+
+       def GetLastError (self):
+               """
+               Get last error message (string).
+               """
+               return self._error
+
+
+       def GetLastWarning (self):
+               """
+               Get last warning message (string).
+               """
+               return self._warning
+
+
+       def SetServer (self, host, port):
+               """
+               Set searchd server host and port.
+               """
+               assert(isinstance(host, str))
+               assert(isinstance(port, int))
+               self._host = host
+               self._port = port
+
+
+       def _Connect (self):
+               """
+               INTERNAL METHOD, DO NOT CALL. Connects to searchd server.
+               """
+               try:
+                       sock = socket.socket ( socket.AF_INET, socket.SOCK_STREAM )
+                       sock.connect ( ( self._host, self._port ) )
+               except socket.error, msg:
+                       if sock:
+                               sock.close()
+                       self._error = 'connection to %s:%s failed (%s)' % ( self._host, self._port, msg )
+                       return 0
+
+               v = unpack('>L', sock.recv(4))
+               if v<1:
+                       sock.close()
+                       self._error = 'expected searchd protocol version, got %s' % v
+                       return 0
+
+               # all ok, send my version
+               sock.send(pack('>L', 1))
+               return sock
+
+
+       def _GetResponse (self, sock, client_ver):
+               """
+               INTERNAL METHOD, DO NOT CALL. Gets and checks response packet from searchd server.
+               """
+               (status, ver, length) = unpack('>2HL', sock.recv(8))
+               response = ''
+               left = length
+               while left>0:
+                       chunk = sock.recv(left)
+                       if chunk:
+                               response += chunk
+                               left -= len(chunk)
+                       else:
+                               break
+
+               sock.close()
+
+               # check response
+               read = len(response)
+               if not response or read!=length:
+                       if length:
+                               self._error = 'failed to read searchd response (status=%s, ver=%s, len=%s, read=%s)' \
+                                       % (status, ver, length, read)
+                       else:
+                               self._error = 'received zero-sized searchd response'
+                       return None
+
+               # check status
+               if status==SEARCHD_WARNING:
+                       wend = 4 + unpack ( '>L', response[0:4] )[0]
+                       self._warning = response[4:wend]
+                       return response[wend:]
+
+               if status==SEARCHD_ERROR:
+                       self._error = 'searchd error: '+response[4:]
+                       return None
+
+               if status==SEARCHD_RETRY:
+                       self._error = 'temporary searchd error: '+response[4:]
+                       return None
+
+               if status!=SEARCHD_OK:
+                       self._error = 'unknown status code %d' % status
+                       return None
+
+               # check version
+               if ver<client_ver:
+                       self._warning = 'searchd command v.%d.%d older than client\'s v.%d.%d, some options might not work' \
+                               % (ver>>8, ver&0xff, client_ver>>8, client_ver&0xff)
+
+               return response
+
+
+       def SetLimits (self, offset, limit, maxmatches=0, cutoff=0):
+               """
+               Set offset and count into result set, and optionally set max-matches and cutoff limits.
+               """
+               assert(isinstance(offset, int) and offset>=0)
+               assert(isinstance(limit, int) and limit>0)
+               assert(maxmatches>=0)
+               self._offset = offset
+               self._limit = limit
+               if maxmatches>0:
+                       self._maxmatches = maxmatches
+               if cutoff>=0:
+                       self._cutoff = cutoff
+
+
+       def SetMaxQueryTime (self, maxquerytime):
+               """
+               Set maximum query time, in milliseconds, per-index. 0 means 'do not limit'.
+               """
+               assert(isinstance(maxquerytime,int) and maxquerytime>0)
+               self._maxquerytime = maxquerytime
+
+
+       def SetMatchMode (self, mode):
+               """
+               Set matching mode.
+               """
+               assert(mode in [SPH_MATCH_ALL, SPH_MATCH_ANY, SPH_MATCH_PHRASE, SPH_MATCH_BOOLEAN, SPH_MATCH_EXTENDED, SPH_MATCH_FULLSCAN, SPH_MATCH_EXTENDED2])
+               self._mode = mode
+
+
+       def SetRankingMode (self, ranker):
+               """
+               Set ranking mode.
+               """
+               assert(ranker in [SPH_RANK_PROXIMITY_BM25, SPH_RANK_BM25, SPH_RANK_NONE, SPH_RANK_WORDCOUNT])
+               self._ranker = ranker
+
+
+       def SetSortMode ( self, mode, clause='' ):
+               """
+               Set sorting mode.
+               """
+               assert ( mode in [SPH_SORT_RELEVANCE, SPH_SORT_ATTR_DESC, SPH_SORT_ATTR_ASC, SPH_SORT_TIME_SEGMENTS, SPH_SORT_EXTENDED, SPH_SORT_EXPR] )
+               assert ( isinstance ( clause, str ) )
+               self._sort = mode
+               self._sortby = clause
+
+
+       def SetWeights (self, weights): 
+               """
+               Set per-field weights.
+               WARNING, DEPRECATED; do not use it! use SetFieldWeights() instead
+               """
+               assert(isinstance(weights, list))
+               for w in weights:
+                       assert(isinstance(w, int))
+               self._weights = weights
+
+
+       def SetFieldWeights (self, weights):
+               """
+               Bind per-field weights by name; expects (name,field_weight) dictionary as argument.
+               """
+               assert(isinstance(weights,dict))
+               for key,val in weights.items():
+                       assert(isinstance(key,str))
+                       assert(isinstance(val,int))
+               self._fieldweights = weights
+
+
+       def SetIndexWeights (self, weights):
+               """
+               Bind per-index weights by name; expects (name,index_weight) dictionary as argument.
+               """
+               assert(isinstance(weights,dict))
+               for key,val in weights.items():
+                       assert(isinstance(key,str))
+                       assert(isinstance(val,int))
+               self._indexweights = weights
+
+
+       def SetIDRange (self, minid, maxid):
+               """
+               Set IDs range to match.
+               Only match records if document ID is beetwen $min and $max (inclusive).
+               """
+               assert(isinstance(minid, int))
+               assert(isinstance(maxid, int))
+               assert(minid<=maxid)
+               self._min_id = minid
+               self._max_id = maxid
+
+
+       def SetFilter ( self, attribute, values, exclude=0 ):
+               """
+               Set values set filter.
+               Only match records where 'attribute' value is in given 'values' set.
+               """
+               assert(isinstance(attribute, str))
+               assert(isinstance(values, list))
+               assert(values)
+
+               for value in values:
+                       assert(isinstance(value, int))
+
+               self._filters.append ( { 'type':SPH_FILTER_VALUES, 'attr':attribute, 'exclude':exclude, 'values':values } )
+
+
+       def SetFilterRange (self, attribute, min_, max_, exclude=0 ):
+               """
+               Set range filter.
+               Only match records if 'attribute' value is beetwen 'min_' and 'max_' (inclusive).
+               """
+               assert(isinstance(attribute, str))
+               assert(isinstance(min_, int))
+               assert(isinstance(max_, int))
+               assert(min_<=max_)
+
+               self._filters.append ( { 'type':SPH_FILTER_RANGE, 'attr':attribute, 'exclude':exclude, 'min':min_, 'max':max_ } )
+
+
+       def SetFilterFloatRange (self, attribute, min_, max_, exclude=0 ):
+               assert(isinstance(attribute,str))
+               assert(isinstance(min_,float))
+               assert(isinstance(max_,float))
+               assert(min_ <= max_)
+               self._filters.append ( {'type':SPH_FILTER_FLOATRANGE, 'attr':attribute, 'exclude':exclude, 'min':min_, 'max':max_} ) 
+
+
+       def SetGeoAnchor (self, attrlat, attrlong, latitude, longitude):
+               assert(isinstance(attrlat,str))
+               assert(isinstance(attrlong,str))
+               assert(isinstance(latitude,float))
+               assert(isinstance(longitude,float))
+               self._anchor['attrlat'] = attrlat
+               self._anchor['attrlong'] = attrlong
+               self._anchor['lat'] = latitude
+               self._anchor['long'] = longitude
+
+
+       def SetGroupBy ( self, attribute, func, groupsort='@group desc' ):
+               """
+               Set grouping attribute and function.
+               """
+               assert(isinstance(attribute, str))
+               assert(func in [SPH_GROUPBY_DAY, SPH_GROUPBY_WEEK, SPH_GROUPBY_MONTH, SPH_GROUPBY_YEAR, SPH_GROUPBY_ATTR] )
+               assert(isinstance(groupsort, str))
+
+               self._groupby = attribute
+               self._groupfunc = func
+               self._groupsort = groupsort
+
+
+       def SetGroupDistinct (self, attribute):
+               assert(isinstance(attribute,str))
+               self._groupdistinct = attribute
+
+
+       def SetRetries (self, count, delay=0):
+               assert(isinstance(count,int) and count>=0)
+               assert(isinstance(delay,int) and delay>=0)
+               self._retrycount = count
+               self._retrydelay = delay
+
+
+       def ResetFilters (self):
+               """
+               Clear all filters (for multi-queries).
+               """
+               self._filters = []
+               self._anchor = {}
+
+
+       def ResetGroupBy (self):
+               """
+               Clear groupby settings (for multi-queries).
+               """
+               self._groupby = ''
+               self._groupfunc = SPH_GROUPBY_DAY
+               self._groupsort = '@group desc'
+               self._groupdistinct = ''
+
+
+       def Query (self, query, index='*', comment=''):
+               """
+               Connect to searchd server and run given search query.
+               Returns None on failure; result set hash on success (see documentation for details).
+               """
+               assert(len(self._reqs)==0)
+               self.AddQuery(query,index,comment)
+               results = self.RunQueries()
+
+               if not results or len(results)==0:
+                       return None
+               self._error = results[0]['error']
+               self._warning = results[0]['warning']
+               if results[0]['status'] == SEARCHD_ERROR:
+                       return None
+               return results[0]
+
+
+       def AddQuery (self, query, index='*', comment=''):
+               """
+               Add query to batch.
+               """
+               # build request
+               req = [pack('>5L', self._offset, self._limit, self._mode, self._ranker, self._sort)]
+               req.append(pack('>L', len(self._sortby)))
+               req.append(self._sortby)
+
+               if isinstance(query,unicode):
+                       query = query.encode('utf-8')
+               assert(isinstance(query,str))
+
+               req.append(pack('>L', len(query)))
+               req.append(query)
+
+               req.append(pack('>L', len(self._weights)))
+               for w in self._weights:
+                       req.append(pack('>L', w))
+               req.append(pack('>L', len(index)))
+               req.append(index)
+               req.append(pack('>L',0)) # id64 range marker FIXME! IMPLEMENT!
+               req.append(pack('>L', self._min_id))
+               req.append(pack('>L', self._max_id))
+               
+               # filters
+               req.append ( pack ( '>L', len(self._filters) ) )
+               for f in self._filters:
+                       req.append ( pack ( '>L', len(f['attr'])) + f['attr'])
+                       filtertype = f['type']
+                       req.append ( pack ( '>L', filtertype))
+                       if filtertype == SPH_FILTER_VALUES:
+                               req.append ( pack ('>L', len(f['values'])))
+                               for val in f['values']:
+                                       req.append ( pack ('>L', val))
+                       elif filtertype == SPH_FILTER_RANGE:
+                               req.append ( pack ('>2L', f['min'], f['max']))
+                       elif filtertype == SPH_FILTER_FLOATRANGE:
+                               req.append ( pack ('>2f', f['min'], f['max']))
+                       req.append ( pack ( '>L', f['exclude'] ) )
+
+               # group-by, max-matches, group-sort
+               req.append ( pack ( '>2L', self._groupfunc, len(self._groupby) ) )
+               req.append ( self._groupby )
+               req.append ( pack ( '>2L', self._maxmatches, len(self._groupsort) ) )
+               req.append ( self._groupsort )
+               req.append ( pack ( '>LLL', self._cutoff, self._retrycount, self._retrydelay)) 
+               req.append ( pack ( '>L', len(self._groupdistinct)))
+               req.append ( self._groupdistinct)
+
+               # anchor point
+               if len(self._anchor) == 0:
+                       req.append ( pack ('>L', 0))
+               else:
+                       attrlat, attrlong = self._anchor['attrlat'], self._anchor['attrlong']
+                       latitude, longitude = self._anchor['lat'], self._anchor['long']
+                       req.append ( pack ('>L', 1))
+                       req.append ( pack ('>L', len(attrlat)) + attrlat)
+                       req.append ( pack ('>L', len(attrlong)) + attrlong)
+                       req.append ( pack ('>f', latitude) + pack ('>f', longitude))
+
+               # per-index weights
+               req.append ( pack ('>L',len(self._indexweights)))
+               for indx,weight in self._indexweights.items():
+                       req.append ( pack ('>L',len(indx)) + indx + pack ('>L',weight))
+
+               # max query time
+               req.append ( pack ('>L', self._maxquerytime) ) 
+
+               # per-field weights
+               req.append ( pack ('>L',len(self._fieldweights) ) )
+               for field,weight in self._fieldweights.items():
+                       req.append ( pack ('>L',len(field)) + field + pack ('>L',weight) )
+
+               # comment
+               req.append ( pack('>L',len(comment)) + comment )
+
+               # send query, get response
+               req = ''.join(req)
+
+               self._reqs.append(req)
+               return
+
+
+       def RunQueries (self):
+               """
+               Run queries batch.
+               Returns None on network IO failure; or an array of result set hashes on success.
+               """
+               if len(self._reqs)==0:
+                       self._error = 'no queries defined, issue AddQuery() first'
+                       return None
+
+               sock = self._Connect()
+               if not sock:
+                       return None
+
+               req = ''.join(self._reqs)
+               length = len(req)+4
+               req = pack('>HHLL', SEARCHD_COMMAND_SEARCH, VER_COMMAND_SEARCH, length, len(self._reqs))+req
+               sock.send(req)
+
+               response = self._GetResponse(sock, VER_COMMAND_SEARCH)
+               if not response:
+                       return None
+
+               nreqs = len(self._reqs)
+
+               # parse response
+               max_ = len(response)
+               p = 0
+
+               results = []
+               for i in range(0,nreqs,1):
+                       result = {}
+                       result['error'] = ''
+                       result['warning'] = ''
+                       status = unpack('>L', response[p:p+4])[0]
+                       p += 4
+                       result['status'] = status
+                       if status != SEARCHD_OK:
+                               length = unpack('>L', response[p:p+4])[0]
+                               p += 4
+                               message = response[p:p+length]
+                               p += length
+
+                               if status == SEARCHD_WARNING:
+                                       result['warning'] = message
+                               else:
+                                       result['error'] = message
+                                       continue
+
+                       # read schema
+                       fields = []
+                       attrs = []
+
+                       nfields = unpack('>L', response[p:p+4])[0]
+                       p += 4
+                       while nfields>0 and p<max_:
+                               nfields -= 1
+                               length = unpack('>L', response[p:p+4])[0]
+                               p += 4
+                               fields.append(response[p:p+length])
+                               p += length
+
+                       result['fields'] = fields
+
+                       nattrs = unpack('>L', response[p:p+4])[0]
+                       p += 4
+                       while nattrs>0 and p<max_:
+                               nattrs -= 1
+                               length = unpack('>L', response[p:p+4])[0]
+                               p += 4
+                               attr = response[p:p+length]
+                               p += length
+                               type_ = unpack('>L', response[p:p+4])[0]
+                               p += 4
+                               attrs.append([attr,type_])
+
+                       result['attrs'] = attrs
+
+                       # read match count
+                       count = unpack('>L', response[p:p+4])[0]
+                       p += 4
+                       id64 = unpack('>L', response[p:p+4])[0]
+                       p += 4
+               
+                       # read matches
+                       result['matches'] = []
+                       while count>0 and p<max_:
+                               count -= 1
+                               if id64:
+                                       dochi, doc, weight = unpack('>3L', response[p:p+12])
+                                       doc += (dochi<<32)
+                                       p += 12
+                               else:
+                                       doc, weight = unpack('>2L', response[p:p+8])
+                                       p += 8
+
+                               match = { 'id':doc, 'weight':weight, 'attrs':{} }
+                               for i in range(len(attrs)):
+                                       if attrs[i][1] == SPH_ATTR_FLOAT:
+                                               match['attrs'][attrs[i][0]] = unpack('>f', response[p:p+4])[0]
+                                       elif attrs[i][1] == (SPH_ATTR_MULTI | SPH_ATTR_INTEGER):
+                                               match['attrs'][attrs[i][0]] = []
+                                               nvals = unpack('>L', response[p:p+4])[0]
+                                               p += 4
+                                               for n in range(0,nvals,1):
+                                                       match['attrs'][attrs[i][0]].append(unpack('>L', response[p:p+4])[0])
+                                                       p += 4
+                                               p -= 4
+                                       else:
+                                               match['attrs'][attrs[i][0]] = unpack('>L', response[p:p+4])[0]
+                                       p += 4
+
+                               result['matches'].append ( match )
+
+                       result['total'], result['total_found'], result['time'], words = unpack('>4L', response[p:p+16])
+
+                       result['time'] = '%.3f' % (result['time']/1000.0)
+                       p += 16
+
+                       result['words'] = []
+                       while words>0:
+                               words -= 1
+                               length = unpack('>L', response[p:p+4])[0]
+                               p += 4
+                               word = response[p:p+length]
+                               p += length
+                               docs, hits = unpack('>2L', response[p:p+8])
+                               p += 8
+
+                               result['words'].append({'word':word, 'docs':docs, 'hits':hits})
+
+                       results.append(result)
+
+               self._reqs = []
+               sock.close()
+               return results
+       
+
+       def BuildExcerpts (self, docs, index, words, opts=None):
+               """
+               Connect to searchd server and generate exceprts from given documents.
+               """
+               if not opts:
+                       opts = {}
+               if isinstance(words,unicode):
+                       words = words.encode('utf-8')
+
+               assert(isinstance(docs, list))
+               assert(isinstance(index, str))
+               assert(isinstance(words, str))
+               assert(isinstance(opts, dict))
+
+               sock = self._Connect()
+
+               if not sock:
+                       return None
+
+               # fixup options
+               opts.setdefault('before_match', '<b>')
+               opts.setdefault('after_match', '</b>')
+               opts.setdefault('chunk_separator', ' ... ')
+               opts.setdefault('limit', 256)
+               opts.setdefault('around', 5)
+
+               # build request
+               # v.1.0 req
+
+               # mode=0, flags=1 (remove spaces)
+               req = [pack('>2L', 0, 1)]
+
+               # req index
+               req.append(pack('>L', len(index)))
+               req.append(index)
+
+               # req words
+               req.append(pack('>L', len(words)))
+               req.append(words)
+
+               # options
+               req.append(pack('>L', len(opts['before_match'])))
+               req.append(opts['before_match'])
+
+               req.append(pack('>L', len(opts['after_match'])))
+               req.append(opts['after_match'])
+
+               req.append(pack('>L', len(opts['chunk_separator'])))
+               req.append(opts['chunk_separator'])
+
+               req.append(pack('>L', int(opts['limit'])))
+               req.append(pack('>L', int(opts['around'])))
+
+               # documents
+               req.append(pack('>L', len(docs)))
+               for doc in docs:
+                       if isinstance(doc,unicode):
+                               doc = doc.encode('utf-8')
+                       assert(isinstance(doc, str))
+                       req.append(pack('>L', len(doc)))
+                       req.append(doc)
+
+               req = ''.join(req)
+
+               # send query, get response
+               length = len(req)
+
+               # add header
+               req = pack('>2HL', SEARCHD_COMMAND_EXCERPT, VER_COMMAND_EXCERPT, length)+req
+               wrote = sock.send(req)
+
+               response = self._GetResponse(sock, VER_COMMAND_EXCERPT )
+               if not response:
+                       return []
+
+               # parse response
+               pos = 0
+               res = []
+               rlen = len(response)
+
+               for i in range(len(docs)):
+                       length = unpack('>L', response[pos:pos+4])[0]
+                       pos += 4
+
+                       if pos+length > rlen:
+                               self._error = 'incomplete reply'
+                               return []
+
+                       res.append(response[pos:pos+length])
+                       pos += length
+
+               return res
+
+
+       def UpdateAttributes ( self, index, attrs, values ):
+               """
+               Update given attribute values on given documents in given indexes.
+               Returns amount of updated documents (0 or more) on success, or -1 on failure.
+
+               'attrs' must be a list of strings.
+               'values' must be a dict with int key (document ID) and list of int values (new attribute values).
+
+               Example:
+                       res = cl.UpdateAttributes ( 'test1', [ 'group_id', 'date_added' ], { 2:[123,1000000000], 4:[456,1234567890] } )
+               """
+               assert ( isinstance ( index, str ) )
+               assert ( isinstance ( attrs, list ) )
+               assert ( isinstance ( values, dict ) )
+               for attr in attrs:
+                       assert ( isinstance ( attr, str ) )
+               for docid, entry in values.items():
+                       assert ( isinstance ( docid, int ) )
+                       assert ( isinstance ( entry, list ) )
+                       assert ( len(attrs)==len(entry) )
+                       for val in entry:
+                               assert ( isinstance ( val, int ) )
+
+               # build request
+               req = [ pack('>L',len(index)), index ]
+
+               req.append ( pack('>L',len(attrs)) )
+               for attr in attrs:
+                       req.append ( pack('>L',len(attr)) + attr )
+
+               req.append ( pack('>L',len(values)) )
+               for docid, entry in values.items():
+                       req.append ( pack('>q',docid) )
+                       for val in entry:
+                               req.append ( pack('>L',val) )
+
+               # connect, send query, get response
+               sock = self._Connect()
+               if not sock:
+                       return None
+
+               req = ''.join(req)
+               length = len(req)
+               req = pack ( '>2HL', SEARCHD_COMMAND_UPDATE, VER_COMMAND_UPDATE, length ) + req
+               wrote = sock.send ( req )
+
+               response = self._GetResponse ( sock, VER_COMMAND_UPDATE )
+               if not response:
+                       return -1
+
+               # parse response
+               updated = unpack ( '>L', response[0:4] )[0]
+               return updated
+
+
+       def BuildKeywords ( self, query, index, hits ):
+               """
+               Connect to searchd server, and generate keywords list for a given query.
+               Returns None on failure, or a list of keywords on success.
+               """
+               assert ( isinstance ( query, str ) )
+               assert ( isinstance ( index, str ) )
+               assert ( isinstance ( hits, int ) )
+
+               # build request
+               req = [ pack ( '>L', len(query) ) + query ]
+               req.append ( pack ( '>L', len(index) ) + index )
+               req.append ( pack ( '>L', hits ) )
+
+               # connect, send query, get response
+               sock = self._Connect()
+               if not sock:
+                       return None
+
+               req = ''.join(req)
+               length = len(req)
+               req = pack ( '>2HL', SEARCHD_COMMAND_KEYWORDS, VER_COMMAND_KEYWORDS, length ) + req
+               wrote = sock.send ( req )
+
+               response = self._GetResponse ( sock, VER_COMMAND_KEYWORDS )
+               if not response:
+                       return None
+
+               # parse response
+               res = []
+
+               nwords = unpack ( '>L', response[0:4] )[0]
+               p = 4
+               max_ = len(response)
+
+               while nwords>0 and p<max_:
+                       nwords -= 1
+
+                       length = unpack ( '>L', response[p:p+4] )[0]
+                       p += 4
+                       tokenized = response[p:p+length]
+                       p += length
+
+                       length = unpack ( '>L', response[p:p+4] )[0]
+                       p += 4
+                       normalized = response[p:p+length]
+                       p += length
+
+                       entry = { 'tokenized':tokenized, 'normalized':normalized }
+                       if hits:
+                               entry['docs'], entry['hits'] = unpack ( '>2L', response[p:p+8] )
+                               p += 8
+
+                       res.append ( entry )
+
+               if nwords>0 or p>max_:
+                       self._error = 'incomplete reply'
+                       return None
+
+               return res
+#
+# $Id: sphinxapi.py 1216 2008-03-14 23:25:39Z shodan $
+#
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