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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙfrom redis.exceptions import RedisError, ResponseError from redis.utils import str_if_bytes class CommandsParser: """ Parses Redis commands to get command keys. COMMAND output is used to determine key locations. Commands that do not have a predefined key location are flagged with 'movablekeys', and these commands' keys are determined by the command 'COMMAND GETKEYS'. """ def __init__(self, redis_connection): self.commands = {} self.initialize(redis_connection) def initialize(self, r): commands = r.execute_command("COMMAND") uppercase_commands = [] for cmd in commands: if any(x.isupper() for x in cmd): uppercase_commands.append(cmd) for cmd in uppercase_commands: commands[cmd.lower()] = commands.pop(cmd) self.commands = commands def parse_subcommand(self, command, **options): cmd_dict = {} cmd_name = str_if_bytes(command[0]) cmd_dict["name"] = cmd_name cmd_dict["arity"] = int(command[1]) cmd_dict["flags"] = [str_if_bytes(flag) for flag in command[2]] cmd_dict["first_key_pos"] = command[3] cmd_dict["last_key_pos"] = command[4] cmd_dict["step_count"] = command[5] if len(command) > 7: cmd_dict["tips"] = command[7] cmd_dict["key_specifications"] = command[8] cmd_dict["subcommands"] = command[9] return cmd_dict # As soon as this PR is merged into Redis, we should reimplement # our logic to use COMMAND INFO changes to determine the key positions # https://github.com/redis/redis/pull/8324 def get_keys(self, redis_conn, *args): """ Get the keys from the passed command. NOTE: Due to a bug in redis<7.0, this function does not work properly for EVAL or EVALSHA when the `numkeys` arg is 0. - issue: https://github.com/redis/redis/issues/9493 - fix: https://github.com/redis/redis/pull/9733 So, don't use this function with EVAL or EVALSHA. """ if len(args) < 2: # The command has no keys in it return None cmd_name = args[0].lower() if cmd_name not in self.commands: # try to split the command name and to take only the main command, # e.g. 'memory' for 'memory usage' cmd_name_split = cmd_name.split() cmd_name = cmd_name_split[0] if cmd_name in self.commands: # save the splitted command to args args = cmd_name_split + list(args[1:]) else: # We'll try to reinitialize the commands cache, if the engine # version has changed, the commands may not be current self.initialize(redis_conn) if cmd_name not in self.commands: raise RedisError( f"{cmd_name.upper()} command doesn't exist in Redis commands" ) command = self.commands.get(cmd_name) if "movablekeys" in command["flags"]: keys = self._get_moveable_keys(redis_conn, *args) elif "pubsub" in command["flags"] or command["name"] == "pubsub": keys = self._get_pubsub_keys(*args) else: if ( command["step_count"] == 0 and command["first_key_pos"] == 0 and command["last_key_pos"] == 0 ): is_subcmd = False if "subcommands" in command: subcmd_name = f"{cmd_name}|{args[1].lower()}" for subcmd in command["subcommands"]: if str_if_bytes(subcmd[0]) == subcmd_name: command = self.parse_subcommand(subcmd) is_subcmd = True # The command doesn't have keys in it if not is_subcmd: return None last_key_pos = command["last_key_pos"] if last_key_pos < 0: last_key_pos = len(args) - abs(last_key_pos) keys_pos = list( range(command["first_key_pos"], last_key_pos + 1, command["step_count"]) ) keys = [args[pos] for pos in keys_pos] return keys def _get_moveable_keys(self, redis_conn, *args): """ NOTE: Due to a bug in redis<7.0, this function does not work properly for EVAL or EVALSHA when the `numkeys` arg is 0. - issue: https://github.com/redis/redis/issues/9493 - fix: https://github.com/redis/redis/pull/9733 So, don't use this function with EVAL or EVALSHA. """ pieces = [] cmd_name = args[0] # The command name should be splitted into separate arguments, # e.g. 'MEMORY USAGE' will be splitted into ['MEMORY', 'USAGE'] pieces = pieces + cmd_name.split() pieces = pieces + list(args[1:]) try: keys = redis_conn.execute_command("COMMAND GETKEYS", *pieces) except ResponseError as e: message = e.__str__() if ( "Invalid arguments" in message or "The command has no key arguments" in message ): return None else: raise e return keys def _get_pubsub_keys(self, *args): """ Get the keys from pubsub command. Although PubSub commands have predetermined key locations, they are not supported in the 'COMMAND's output, so the key positions are hardcoded in this method """ if len(args) < 2: # The command has no keys in it return None args = [str_if_bytes(arg) for arg in args] command = args[0].upper() keys = None if command == "PUBSUB": # the second argument is a part of the command name, e.g. # ['PUBSUB', 'NUMSUB', 'foo']. pubsub_type = args[1].upper() if pubsub_type in ["CHANNELS", "NUMSUB"]: keys = args[2:] elif command in ["SUBSCRIBE", "PSUBSCRIBE", "UNSUBSCRIBE", "PUNSUBSCRIBE"]: # format example: # SUBSCRIBE channel [channel ...] keys = list(args[1:]) elif command == "PUBLISH": # format example: # PUBLISH channel message keys = [args[1]] return keys