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clean up how errors are returned

Changeset 80ff910c8ff5…

Parent 4e30762c5ca3…

by Profile picture of Benjamin PollackBenjamin Pollack

Changes to one file · Browse files at 80ff910c8ff5 Showing diff from parent 4e30762c5ca3 Diff from another changeset...

Change 1 of 6 Show Changes Only miniredis.py Stacked
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 #!/usr/bin/env python    import getopt  import os  import re  import pickle  import select  import socket  import sys  import threading    class RedisError(object):   def __init__(self, message):   self.message = message     def __repr__(self):   return '<RedisError(%s)>' % self.message   -class RedisBadValueError(RedisError): - def __init__(self): - super(RedisBadValueError, self).__init__('Operation against a key holding the wrong kind of value') -  class RedisConstant(object):   def __init__(self, type):   self.type = type     def __repr__(self):   return '<RedisConstant(%s)>' % self.type    EMPTY_SCALAR = RedisConstant('EmptyScalar') -EMPTY_ARRAY = RedisConstant('EmptyArray') +EMPTY_LIST = RedisConstant('EmptyList') +BAD_VALUE = RedisError('Operation against a key holding the wrong kind of value')      class RedisClient(object):   def __init__(self, socket):   self.socket = socket   self.wfile = socket.makefile('wb')   self.rfile = socket.makefile('rb')   self.db = None   self.table = None    class MiniRedis(threading.Thread):   def __init__(self, host='127.0.0.1', port=56784, logging=False, db_file=None):   super(MiniRedis, self).__init__()   self.host = host   self.port = port   self.logging = logging   self.halt = True   self.tables = {}   self.clients = {}   self.db_file = db_file     self.load()     def log(self, client, s):   if self.logging:   who = '%s:%s' % client.socket.getpeername() if client else 'SERVER'   print '%s: %s' % (who, s)     def select(self, client, db):   if db not in self.tables:   self.tables[db] = {}   client.db = db   client.table = self.tables[db]     def save(self):   if self.db_file:   with open(self.db_file, 'wb') as f:   pickle.dump(self.tables, f, pickle.HIGHEST_PROTOCOL)   self.log(None, 'saved database to "%s"' % self.db_file)     def load(self):   if self.db_file and os.path.lexists(self.db_file):   with open(self.db_file, 'rb') as f:   self.tables = pickle.load(f)   self.log(None, 'loaded database from file "%s"' % self.db_file)     def handle_set(self, client, key, data):   client.table[key] = data   self.log(client, 'SET %s -> %s' % (key, data))   return True     def handle_get(self, client, key):   data = client.table.get(key, None)   if isinstance(data, list): - return RedisBadValueError() + return BAD_VALUE   if data != None:   data = str(data)   else:   data = EMPTY_SCALAR   self.log(client, 'GET %s -> %s' % (key, data))   return data     def handle_del(self, client, key):   self.log(client, 'DEL %s' % key)   if key not in client.table:   return 0   del client.table[key]   return 1     def handle_lpush(self, client, key, data):   if key not in client.table:   client.table[key] = []   elif not isinstance(client.table[key], list): - return RedisBadValueError() + return BAD_VALUE   client.table[key].insert(0, data)   self.log(client, 'LPUSH %s %s' % (key, data))   return True     def handle_rpop(self, client, key):   if key not in client.table:   return EMPTY_SCALAR   if not isinstance(client.table[key], list): - return RedisBadValueError() + return BAD_VALUE   if len(client.table[key]) > 0:   data = client.table[key].pop()   else:   data = EMPTY_SCALAR   self.log(client, 'LPOP %s -> %s' % (key, data))   return data     def handle_keys(self, client, pattern):   r = re.compile(pattern.replace('*', '.*'))   self.log(client, 'KEYS %s' % pattern)   return ' '.join(k for k in client.table.keys() if r.search(k))     def handle_incr(self, client, key):   return self.handle_incrby(client, key, 1)     def handle_incrby(self, client, key, by):   try:   client.table[key] = int(client.table[key])   client.table[key] += int(by)   except (KeyError, TypeError, ValueError):   client.table[key] = 1   self.log(client, 'INCRBY %s %s -> %s' % (key, by, client.table[key]))   return client.table[key]     def handle_flushdb(self, client):   self.log(client, 'FLUSHDB')   client.table.clear()   return True     def handle_select(self, client, db):   db = int(db)   self.select(client, db)   self.log(client, 'SELECT %s' % db)   return True     def handle_quit(self, client):   self.log(client, 'QUIT')   client.socket.shutdown(socket.SHUT_RDWR)   client.socket.close()   del self.clients[client.socket]   return False     def handle_shutdown(self, client):   self.log(client, 'SHUTDOWN')   self.halt = True   return True     def handle_save(self, client):   self.save()   self.log(client, 'SAVE')   return True     def unwrap_set(self, client, line):   key, length = line.split()   data = client.rfile.read(int(length))   client.rfile.read(2) # throw out newline   return self.handle_set(key, client, data)     def unwrap_get(self, client, line):   key = line.strip()   return self.handle_get(client, key)     def unwrap_del(self, client, line):   key = line.strip()   return self.handle_del(client, key)     def unwrap_lpush(self, client, line):   key, length = line.split()   data = client.rfile.read(int(length))   client.rfile.read(2) # throw out newline   return self.handle_lpush(client, key, data)     def unwrap_rpop(self, client, line):   key = line.strip()   return self.handle_rpop(client, key)     def unwrap_keys(self, client, line):   pattern = line.strip()   return self.handle_keys(client, pattern)     def unwrap_incrby(self, client, line):   key, by = line.split()   return self.handle_incrby(client, key, by)     def unwrap_flushdb(self, client, line):   return self.handle_flushdb(client)     def unwrap_select(self, client, line):   db = line.strip()   return self.handle_select(client, db)     def unwrap_quit(self, client, line):   return self.handle_quit(client)     def unwrap_shutdown(self, client, line):   return self.handle_shutdown(client)     def handle_normal(self, client, line):   command, _, rest = line.partition(' ')   return getattr(self, 'unwrap_' + command.strip().lower())(client, rest)     def handle_multibulk(self, client, line):   items = int(line[1:].strip())   args = []   for x in xrange(0, items):   length = int(client.rfile.readline().strip()[1:])   args.append(client.rfile.read(length))   client.rfile.read(2) # throw out newline   command = args[0].lower()   return getattr(self, 'handle_' + command)(client, *args[1:])     def handle(self, client):   line = client.rfile.readline()   if not line:   self.log(client, 'client disconnected')   del self.clients[client.socket]   client.socket.close()   return   if line[0] == '*':   o = self.handle_multibulk(client, line)   else:   o = self.handle_normal(client, line)   self.dump(client, o)     def dump(self, client, o):   nl = '\r\n'   if isinstance(o, bool):   if o:   client.wfile.write('+OK\r\n')   # Show nothing for a false return; that means be quiet   elif o == EMPTY_SCALAR:   client.wfile.write('$-1\r\n') - elif o == EMPTY_ARRAY: + elif o == EMPTY_LIST:   client.wfile.write('*-1\r\n')   elif isinstance(o, int):   client.wfile.write(':' + str(o) + nl)   elif isinstance(o, str):   client.wfile.write('$' + str(len(o)) + nl)   client.wfile.write(o + nl)   elif isinstance(o, list):   client.wfile.write('*' + len(o))   for val in o:   self.dump(client, val)   elif isinstance(o, RedisError):   client.wfile.write('-ERR %s\r\n' % o.message)   else:   client.wfile.write('return type not yet implemented\r\n')   client.wfile.flush()     def stop(self):   self.halt = True   self.join()     def run(self):   self.halt = False   server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)   server.bind((self.host, self.port))   server.listen(5)   while not self.halt:   readable, _, _ = select.select([server] + self.clients.keys(), [], [], 1.0)   for sock in readable:   if sock == server:   (client_socket, address) = server.accept()   client = RedisClient(client_socket)   self.clients[client_socket] = client   self.log(client, 'client connected')   self.select(client, 0)   else:   try:   self.handle(self.clients[sock])   except Exception, e:   self.log(client, 'exception: %s' % e)   self.handle_quit(client)   for client_socket in self.clients.iterkeys():   client_socket.close()   self.clients.clear()   server.close()   server = None    def main(args):   host, port, logging = '127.0.0.1', 56784, True   opts, args = getopt.getopt(args, 'h:p:l')   for o, a in opts:   if o == '-h':   host = a   elif o == '-p':   port = int(a)   elif o == '-l':   logging = True   print 'Launching MiniRedis on %s:%s' % (host, port)   m = MiniRedis(host=host, port=port, logging=logging, db_file='miniredis.db')   m.start()   m.join()   print 'Stopped'    if __name__ == '__main__':   main(sys.argv[1:])