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from collections import deque
import time
import random
import tornado.ioloop
import tornado.stack_context
import psycopg2
import imc.async
class RestrictCursor:
def __init__(self,db,cur):
self._db = db
self._cur = cur
self._ori_cur = cur
self._in_transaction = False
self._init_implement()
def __iter__(self):
return self._cur
def execute(self,sql,param = None,_grid = None):
self._db.execute(self._cur,sql,param)
self.arraysize = self._cur.arraysize
self.itersize = self._cur.itersize
self.rowcount = self._cur.rowcount
self.rownumber = self._cur.rownumber
self.lastrowid = self._cur.lastrowid
self.query = self._cur.query
self.statusmessage = self._cur.statusmessage
def begin(self):
if self._in_transaction == True:
return
self._cur = self._db.begin_transaction()
self._init_implement()
self._db.execute(self._cur,'BEGIN;')
self._in_transaction = True
def commit(self):
if self._in_transaction == False:
return
self._db.execute(self._cur,'COMMIT;')
if self._cur.statusmessage == 'COMMIT':
ret = True
else:
ret = False
self._db.end_transaction(self._cur.connection)
self._cur = self._ori_cur
self._in_transaction = False
return ret
def rollback(self):
if self._in_transaction == False:
return
self._db.execute(self._cur,'ROLLBACK;')
self._db.end_transaction(self._cur.connection)
self._cur = self._ori_cur
self._in_transaction = False
def auto_transaction(self,f):
def wrapper(*args,**kwargs):
retry =
while True:
self.begin()
try:
ret = f(*args,**kwargs)
except psycopg2.Error:
self.rollback()
continue
except Exception:
self.rollback()
raise
if self.commit() == True:
break
return ret
return wrapper
def _init_implement(self):
self.fetchone = self._cur.fetchone
self.fetchmany = self._cur.fetchmany
self.fetchall = self._cur.fetchall
self.scroll = self._cur.scroll
self.cast = self._cur.cast
self.tzinfo_factory = self._cur.tzinfo_factory
self.arraysize = 0
self.itersize = 0
self.rowcount = 0
self.rownumber = 0
self.lastrowid = None
self.query = ''
self.statusmessage = ''
class AsyncDB:
def __init__(self,dbname,user,password):
self.OPER_CURSOR = 0
self.OPER_EXECUTE = 1
self._ioloop = tornado.ioloop.IOLoop.instance()
self._dbname = dbname
self._user = user
self._password = password
self._conn_fdmap = {}
self._free_connpool = []
self._share_connpool = []
self._pendoper_fdmap = {}
self._opercallback_fdmap = {}
for i in range(8):
conn = self._create_conn()
self._free_connpool.append(conn)
self._ioloop.add_handler(conn.fileno(),
self._oper_dispatch,
tornado.ioloop.IOLoop.ERROR)
self._oper_dispatch(conn.fileno(),0)
for i in range(2):
conn = self._create_conn()
self._share_connpool.append(conn)
self._ioloop.add_handler(conn.fileno(),
self._oper_dispatch,
tornado.ioloop.IOLoop.ERROR)
self._oper_dispatch(conn.fileno(),0)
def cursor(self):
return RestrictCursor(self,self._cursor())
@imc.async.callee
def execute(self,cur,sql,param = None,_grid = None):
fd = cur.connection.fileno()
self._pendoper_fdmap[fd].append((self.OPER_EXECUTE,(cur,sql,param),_grid))
self._oper_dispatch(fd,0)
imc.async.switchtop()
def begin_transaction(self):
if len(self._free_connpool) > 0:
conn = self._free_connpool.pop()
else:
conn = self._create_conn()
self._ioloop.add_handler(conn.fileno(),
self._oper_dispatch,
tornado.ioloop.IOLoop.ERROR)
return self._cursor()
def end_transaction(self,conn):
if len(self._free_connpool) < 16:
self._free_connpool.append(conn)
else:
conn.close()
@imc.async.callee
def _cursor(self,conn = None,_grid = None):
if conn != None:
fd = conn.fileno()
else:
fd = self._share_connpool[random.randrange(len(self._share_connpool))].fileno()
self._pendoper_fdmap[fd].append((self.OPER_CURSOR,None,_grid))
self._oper_dispatch(fd,0)
cur = imc.async.switchtop()
return cur
def _create_conn(self):
conn = psycopg2.connect(database = self._dbname,
user = self._user,
password = self._password,
async = 1)
fd = conn.fileno()
self._conn_fdmap[fd] = conn
self._pendoper_fdmap[fd] = deque()
self._opercallback_fdmap[fd] = None
return conn
def _oper_dispatch(self,fd,evt):
err = None
conn = self._conn_fdmap[fd]
try:
stat = conn.poll()
except Exception as e:
err = e
if err != None or stat == psycopg2.extensions.POLL_OK:
self._ioloop.update_handler(fd,
tornado.ioloop.IOLoop.ERROR)
elif stat == psycopg2.extensions.POLL_READ:
self._ioloop.update_handler(fd,
tornado.ioloop.IOLoop.READ | tornado.ioloop.IOLoop.ERROR)
return
elif stat == psycopg2.extensions.POLL_WRITE:
self._ioloop.update_handler(fd,
tornado.ioloop.IOLoop.WRITE | tornado.ioloop.IOLoop.ERROR)
return
cb = self._opercallback_fdmap[fd]
if cb != None:
self._opercallback_fdmap[fd] = None
cb(err)
else:
try:
oper,data,grid = self._pendoper_fdmap[fd].popleft()
except IndexError:
return
if oper == self.OPER_CURSOR:
def _ret_cursor(err = None):
if err == None:
imc.async.retcall(grid,conn.cursor())
else:
imc.async.retcall(grid,err = err)
self._opercallback_fdmap[fd] = _ret_cursor
elif oper == self.OPER_EXECUTE:
def _ret_execute(err = None):
if err == None:
imc.async.retcall(grid,None)
else:
imc.async.retcall(grid,err = err)
cur,sql,param = data
cur.execute(sql,param)
self._opercallback_fdmap[fd] = _ret_execute
self._ioloop.add_callback(self._oper_dispatch,fd,0)
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