import struct, contextlib, math
from . import db, lib
-from .db import bd, txnfun
+from .db import bd, txnfun, dloopfun
__all__ = ["maybe", "t_int", "t_uint", "t_float", "t_str", "ordered"]
self.bk.close()
class cursor(lib.closable):
- def __init__(self, idx, cur, item, stop):
+ def __init__(self, idx, fd, fi, ld, li, reverse):
self.idx = idx
- self.cur = cur
- self.item = item
- self.stop = stop
+ self.typ = idx.typ
+ self.cur = self.idx.bk.cursor()
+ self.item = None
+ self.fd = fd
+ self.fi = fi
+ self.ld = ld
+ self.li = li
+ self.rev = reverse
def close(self):
if self.cur is not None:
self.cur.close()
+ self.cur = None
def __iter__(self):
return self
- def peek(self):
- if self.item is None:
- raise StopIteration()
- rk, rv = self.item
- rk = self.idx.typ.decode(rk)
- rv = struct.unpack(">Q", rv)[0]
- if self.stop(rk):
- self.item = None
- raise StopIteration()
- return rk, rv
+ def _decode(self, d):
+ k, v = d
+ k = self.typ.decode(k)
+ v = struct.unpack(">Q", v)[0]
+ return k, v
- def __next__(self):
- rk, rv = self.peek()
+ @dloopfun
+ def first(self):
+ try:
+ if self.fd is None:
+ self.item = self._decode(self.cur.first())
+ else:
+ k, v = self._decode(self.cur.set_range(self.typ.encode(self.fd)))
+ if not self.fi:
+ while self.typ.compare(k, self.fd) == 0:
+ k, v = self._decode(self.cur.next())
+ self.item = k, v
+ except notfound:
+ self.item = StopIteration
+
+ @dloopfun
+ def last(self):
+ try:
+ if self.fd is None:
+ self.item = self._decode(self.cur.last())
+ else:
+ k, v = self._decode(self.cur.set_range(self.typ.encode(self.ld)))
+ if self.fi:
+ while self.typ.compare(k, self.fd) == 0:
+ k, v = self._decode(self.cur.next())
+ k, v = self._decode(self.cur.prev())
+ else:
+ while self.typ.compare(k, self.fd) >= 0:
+ k, v = self._decode(self.cur.prev())
+ self.item = k, v
+ except notfound:
+ self.item = StopIteration
+
+ @dloopfun
+ def next(self):
+ try:
+ k, v = self.item = self._decode(self.cur.next())
+ if ((self.li and self.typ.compare(k, self.ld) > 0) or
+ (not self.li and self.typ.compare(k, self.ld) >= 0)):
+ self.item = StopIteration
+ except notfound:
+ self.item = StopIteration
+
+ @dloopfun
+ def prev(self):
try:
- while True:
- try:
- self.item = self.cur.next()
- break
- except deadlock:
- continue
+ self.item = self._decode(self.cur.prev())
+ if ((self.fi and self.typ.compare(k, self.fd) < 0) or
+ (not self.fi and self.typ.compare(k, self.fd) <= 0)):
+ self.item = StopIteration
except notfound:
- self.item = None
- return rk, rv
+ self.item = StopIteration
+
+ def __next__(self):
+ if self.item is None:
+ if not self.rev:
+ self.next()
+ else:
+ self.prev()
+ if self.item is StopIteration:
+ raise StopIteration()
+ ret, self.item = self.item, None
+ return ret
def skip(self, n=1):
try:
except StopIteration:
return
- def get(self, *, match=missing, ge=missing, gt=missing, lt=missing, le=missing, all=False):
- while True:
- try:
- cur = self.bk.cursor()
- done = False
- try:
- if match is not missing:
- try:
- k, v = cur.set(self.typ.encode(match))
- except notfound:
- return self.cursor(None, None, None, None)
- else:
- done = True
- return self.cursor(self, cur, (k, v), lambda o: (self.typ.compare(o, match) != 0))
- elif all:
- try:
- k, v = cur.first()
- except notfound:
- return self.cursor(None, None, None, None)
- else:
- done = True
- return self.cursor(self, cur, (k, v), lambda o: False)
- elif ge is not missing or gt is not missing or lt is not missing or le is not missing:
- skip = False
- try:
- if ge is not missing:
- k, v = cur.set_range(self.typ.encode(ge))
- elif gt is not missing:
- k, v = cur.set_range(self.typ.encode(gt))
- skip = True
- else:
- k, v = cur.first()
- except notfound:
- return self.cursor(None, None, None, None)
- if lt is not missing:
- stop = lambda o: self.typ.compare(o, lt) >= 0
- elif le is not missing:
- stop = lambda o: self.typ.compare(o, le) > 0
- else:
- stop = lambda o: False
- ret = self.cursor(self, cur, (k, v), stop)
- if skip:
- try:
- while self.typ.compare(ret.peek()[0], gt) == 0:
- next(ret)
- except StopIteration:
- pass
- done = True
- return ret
- else:
- raise NameError("invalid get() specification")
- finally:
- if not done:
- cur.close()
- except deadlock:
- continue
+ def get(self, *, match=missing, ge=missing, gt=missing, lt=missing, le=missing, all=False, reverse=False):
+ if all:
+ cur = self.cursor(self, None, True, None, True, reverse)
+ elif match is not missing:
+ cur = self.cursor(self, match, True, match, True, reverse)
+ elif ge is not missing or gt is not missing or lt is not missing or le is not missing:
+ if ge is not missing:
+ fd, fi = ge, True
+ elif gt is not missing:
+ fd, fi = gt, False
+ else:
+ fd, fi = None, True
+ if le is not missing:
+ ld, li = le, True
+ elif lt is not missing:
+ ld, li = lt, False
+ else:
+ ld, li = None, True
+ cur = self.cursor(self, fd, fi, ld, li, reverse)
+ else:
+ raise NameError("invalid get() specification")
+ done = False
+ try:
+ if not reverse:
+ cur.first()
+ else:
+ cur.last()
+ done = True
+ return cur
+ finally:
+ if not done:
+ cur.close()
@txnfun(lambda self: self.db.env.env)
def put(self, key, id, *, tx):
Dolda2000 GitWeb / didex.git / blobdiff