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#
#
# Copyright (c) 2008-2012 WiredTiger, Inc.
# All rights reserved.
#
# See the file LICENSE for redistribution information.
#
# WiredTiger public interface
'''
WiredTiger Python API.
This module exports several functions and classes.
'''
import struct
from urlparse import urlparse
from wiredtiger.service import WiredTiger
from service.ttypes import WT_RECORD
from thrift.transport import TSocket, TTransport
from thrift.protocol import TBinaryProtocol
def __wt2struct(fmt):
if not fmt:
return None, fmt
# Big endian with no alignment is the default
if fmt[0] in '@=<>!':
tfmt = fmt[0]
fmt = fmt[1:]
else:
tfmt = '>'
return tfmt, fmt.replace('r', 'Q')
def unpack(fmt, s):
tfmt, fmt = __wt2struct(fmt)
if not fmt:
return ()
result = ()
pfmt = tfmt
sizebytes = 0
for offset, f in enumerate(fmt):
if f.isdigit():
sizebytes += 1
# With a fixed size, everything is encoded as a string
if f in 'Su' and sizebytes > 0:
f = 's'
if f not in 'Su':
pfmt += f
sizebytes = 0
continue
# We've hit something that needs special handling, split any fixed-size
# values we've already passed
if len(pfmt) > 1:
size = struct.calcsize(pfmt)
result += struct.unpack_from(pfmt, s)
s = s[size:]
if f == 'S':
l = s.find('\0')
result += (s[:l],)
s = s[l+1:]
if f == 'u':
if offset == len(fmt) - 1:
result += (s,)
else:
l = struct.unpack_from(tfmt + 'l', s)[0]
s = s[struct.calcsize(tfmt + 'l'):]
result += (s[:l],)
s = s[l:]
pfmt = tfmt
sizebytes = 0
if len(pfmt) > 1:
result += struct.unpack(pfmt, s)
return result
def pack(fmt, *values):
pfmt, fmt = __wt2struct(fmt)
if not fmt:
return ''
i = sizebytes = 0
for offset, f in enumerate(fmt):
if f == 'S':
# Note: this code is being careful about embedded NUL characters
if sizebytes == 0:
l = values[i].find('\0') + 1
if not l:
l = len(values[i]) + 1
pfmt += str(l)
sizebytes = len(str(l))
f = 's'
elif f == 'u':
if sizebytes == 0 and offset != len(fmt) - 1:
l = len(values[i])
pfmt += 'l' + str(l)
values = values[:i] + (l,) + values[i:]
sizebytes = len(str(l))
f = 's'
pfmt += f
if f.isdigit():
sizebytes += 1
continue
if f != 's' and sizebytes > 0:
i += int(pfmt[-sizebytes:])
else:
i += 1
sizebytes = 0
return struct.pack(pfmt, *values)
class Cursor:
def __init__(self, session, handle):
self.session = session
self.client = session.client
self.id = handle.id
self.keyfmt = handle.keyfmt
self.valuefmt = handle.valuefmt
def close(self, config=''):
return self.client.close_cursor(self.id, config)
def get_key(self):
return unpack(self.keyfmt, self.key)
def get_value(self):
return unpack(self.keyfmt, self.value)
def set_key(self, *args):
self.key = pack(self.keyfmt, *args)
def set_value(self, *args):
self.value = pack(self.valuefmt, *args)
def first(self):
result = self.client.move_first(self.id)
self.key, self.value = result.record.key, result.record.value
return result.exact
def last(self):
result = self.client.move_last(self.id)
self.key, self.value = result.record.key, result.record.value
return result.exact
def next(self):
result = self.client.move_next(self.id)
self.key, self.value = result.record.key, result.record.value
return result.exact
def prev(self):
result = self.client.move_prev(self.id)
self.key, self.value = result.record.key, result.record.value
return result.exact
def search(self):
result = self.client.search(self.id, WT_RECORD(self.key, self.value))
self.key, self.value = result.record.key, result.record.value
return result.exact
def insert(self):
self.key = self.client.insert_record(self.id, WT_RECORD(self.key, self.value))
def update(self):
return self.client.update_record(self.id, self.value)
def delete(self):
return self.client.delete_record(self.id)
class Session:
def __init__(self, conn, id):
self.conn = conn
self.client = conn.client
self.id = id
def close(self, config=''):
self.client.close_session(self.id, config)
def open_cursor(self, uri, config=''):
return Cursor(self, self.client.open_cursor(self.id, uri, config))
def dup_cursor(self, c, config=''):
return Cursor(self, self.client.dup_cursor(self.id, c.id, config))
def create_table(self, name, config=''):
self.client.create_table(self.id, name, config)
def rename_table(self, oldname, newname, config=''):
self.client.rename_table(self.id, oldname, newname, config)
def drop_table(self, name, config=''):
self.client.drop_table(self.id, name, config)
def truncate_table(self, name, start=None, end=None, config=''):
self.client.truncate_table(self.id, name, name, start and start.id or 0, end and end.id or 0, config)
def verify_table(self, name, config=''):
self.client.verify_table(self.id, name, config)
def begin_transaction(self, config=''):
self.client.begin_transaction(self.id, config)
def commit_transaction(self):
self.client.begin_transaction(self.id)
def rollback_transaction(self):
self.client.rollback_transaction(self.id)
def checkpoint(self, config=''):
self.client.checkpoint(self.id, config)
class Connection:
def __init__(self, uri, config=''):
url = urlparse(uri)
parts = url[1].split(':')
host = parts[0]
if len(parts) > 1:
port = int(parts[1])
else:
port = 9090
home = url[2]
socket = TSocket.TSocket(host, port)
self.transport = TTransport.TBufferedTransport(socket)
protocol = TBinaryProtocol.TBinaryProtocol(self.transport)
self.client = WiredTiger.Client(protocol)
self.transport.open()
self.id = self.client.open(home, config)
def close(self, config=''):
self.client.close_connection(self.id, config)
self.transport.close()
def version(self):
v = self.client.version(self.id, config)
return v.version_string, v.major, v.minor, v.patch
def open_session(self, config=''):
id = self.client.open_session(self.id, config)
return Session(self, id)
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