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"""Client for abase"""
from __future__ import absolute_import, division, print_function, unicode_literals
import datetime
import functools
import time
import bytedredis
from redis.client import Pipeline as RedisPipeline
from redis.exceptions import (
ConnectionError,
TimeoutError,
)
SIMPLE_ABASE_COMMANDS = [
"decr",
"decrby",
"expire",
"expireat",
"get",
"incr",
"incrby",
"lpush",
"lpop",
"lindex",
"llen",
"lrange",
"persist",
"pexpire",
"psetex",
"psetex",
'rpush',
"pttl",
"set",
"setex",
"setnx",
"ttl",
"hset",
"hget",
"hdel",
]
class Client(object):
def __init__(self, psm, table, from_url=True, **kwargs):
"""Create abase client.
:param psm: abase service name
:type psm: str
:param table: abase table name
:type tabale: str
:param socket_timeout: set the underlying socket's timeout
:type socket_timeout: float
:param socket_connect_timeout: set the connect timeout for underlying socket
:type socket_connect_timeout: float
:param decode_responses: set True to return strings, False(default) to bytes
:type decode_responses: bool
"""
available_params = ["socket_timeout", "socket_connect_timeout",
"decode_responses", "password"]
redis_kwargs = {}
for k in available_params:
if k in kwargs:
redis_kwargs[k] = kwargs[k]
self._psm = psm
self._table = table
if from_url:
self._redis_client = bytedredis.Client.from_url("redis://?redis_psm=" + psm, **redis_kwargs)
else:
self._redis_client = bytedredis.Client(redis_psm=psm, **redis_kwargs)
def _compose_abase_key(self, key):
return "[%s]%s" % (self._table, key)
@functools.wraps(bytedredis.Client.exists)
def exists(self, *keys):
return self._redis_client.exists(*(self._compose_abase_key(key) for key in keys))
@functools.wraps(bytedredis.Client.delete)
def delete(self, *keys):
return self._redis_client.delete(*(self._compose_abase_key(key) for key in keys))
@functools.wraps(bytedredis.Client.mget)
def mget(self, keys, *args):
return self._redis_client.mget((self._compose_abase_key(key) for key in keys), *args)
@functools.wraps(bytedredis.Client.mset)
def mset(self, mapping):
mapping = {self._compose_abase_key(k): v for k, v in mapping.items()}
return self._redis_client.mset(mapping)
@functools.wraps(bytedredis.Client.eval)
def eval(self, script, numkeys, *keys_and_args):
keys = keys_and_args[:numkeys]
args = keys_and_args[numkeys:]
keys = [self._compose_abase_key(key) for key in keys]
keys.extend(args)
return self._redis_client.eval(script, numkeys, *keys)
@functools.wraps(bytedredis.Client.evalsha)
def evalsha(self, script, numkeys, *keys_and_args):
keys = keys_and_args[:numkeys]
args = keys_and_args[numkeys:]
keys = [self._compose_abase_key(key) for key in keys]
keys.extend(args)
return self._redis_client.evalsha(script, numkeys, *keys)
def scanrow(self, row, limit, offset=0, target=None):
row = self._compose_abase_key(row)
args = [row, limit, offset]
if target:
args.append(target)
return self._redis_client.execute_command("SCANROW", *args)
def xget(self, key):
return self._redis_client.execute_command("XGET", self._compose_abase_key(key))
def xset(self, key, value, generation, ex=None, px=None):
if ex is not None and px is not None:
raise ValueError("ex and px must not be specified both")
args = [self._compose_abase_key(key), value, generation]
if ex is not None:
args.append("EX")
if isinstance(ex, datetime.timedelta):
ex = int(ex.total_seconds())
args.append(ex)
if px is not None:
args.append("PX")
if isinstance(px, datetime.timedelta):
px = int(px.total_seconds() * 1000)
args.append(px)
return self._redis_client.execute_command("XSET", *args)
def append(self, key, value, ttl=None):
args = [self._compose_abase_key(key), value]
if ttl is not None:
args.append(ttl)
return self._redis_client.execute_command("APPEND", *args)
def prepend(self, key, value, ttl=None):
args = [self._compose_abase_key(key), value]
if ttl is not None:
args.append(ttl)
return self._redis_client.execute_command("PREPEND", *args)
def pipeline(self):
return AbasePipeline(self._table,
self._redis_client.connection_pool,
self._redis_client.response_callbacks,
self._redis_client._metrics_client)
class AbasePipeline(RedisPipeline):
SUPPORTED_COMMANDS = set([
"GET",
"SET",
"DEL",
"SETEX",
"SETNX",
"INCR",
"INCRBY",
"DECR",
"DECRBY",
"TTL",
"PTTL",
"PSETEX",
"EXPIRE",
"EXPIREAT",
"PEXPIRE",
"PERSIST",
"LPUSH",
"RPUSH",
"LRANGE",
"Hgetall",
"Hset",
"Hdrop",
"Hsetexpires"
])
def __init__(self, table, conn_pool, response_callbacks, metrics_client, *args, **kwargs):
transaction = False
shard_hint = None
super(AbasePipeline, self).__init__(conn_pool, response_callbacks, transaction, shard_hint)
self._table = table
self._metrics_client = metrics_client
def _get_connection(self):
if self.connection:
return self.connection
self.connection = self.connection_pool.get_connection("MULTI", self.shard_hint)
return self.connection
def execute_command(self, *args, **kwargs):
cmd = args[0]
if cmd not in AbasePipeline.SUPPORTED_COMMANDS:
raise ValueError("{cmd} is not supported, supported cmds are [{cmds}]".format(
cmd=cmd, cmds=", ".join(list(AbasePipeline.SUPPORTED_COMMANDS))
))
args = self._transfer_to_abase_cmd(cmd, args[1:])
return super(AbasePipeline, self).execute_command(*args, **kwargs)
def execute(self, raise_on_error=True):
cmd_name = "PIPELINE"
ok = True
start = time.time()
conn = self._get_connection()
try:
return self._execute(conn, raise_on_error)
except Exception:
ok = False
raise
finally:
cost = int((time.time() - start) * 1000 * 1000)
rip = "%s_%s" % (conn.host, conn.port)
self._metrics_client.emit(ok, latency=cost, method=cmd_name, rip=rip)
def _execute(self, conn, raise_on_error):
try:
return self._execute_pipeline(conn, self.command_stack, raise_on_error)
except (ConnectionError, TimeoutError) as e:
conn.disconnect()
# if retry_on_timeout is not set, or the error is not
# a TimeoutError, raise it
if not (conn.retry_on_timeout and isinstance(e, TimeoutError)):
raise
# retry a TimeoutError when retry_on_timeout is set
return self._execute_pipeline(conn, self.command_stack, raise_on_error)
finally:
self.reset()
def _transfer_to_abase_cmd(self, cmd, redis_args):
abase_args = [cmd]
for idx, arg in enumerate(redis_args):
if idx == 0 or cmd == 'DEL':
abase_args.append(self._compose_abase_key(arg))
else:
abase_args.append(arg)
return abase_args
def _compose_abase_key(self, key):
return "[%s]%s" % (self._table, key)
def compose_simple_abase_command(command):
redis_command = getattr(bytedredis.Client, command)
@functools.wraps(redis_command)
def abase_command(self, *args, **kwargs):
args = list(args)
redis_command = getattr(self._redis_client, command)
key = self._compose_abase_key(args.pop(0))
return redis_command(key, *args, **kwargs)
return abase_command
for command in SIMPLE_ABASE_COMMANDS:
if hasattr(bytedredis.Client, command):
setattr(Client, command, compose_simple_abase_command(command))
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