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helper.py
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/
helper.py
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import pika
import logging
import curio
from magne.logger import get_component_log
def parse_amqp_url(amqp_url):
protocol, address = amqp_url.split('://')
assert protocol == 'amqp'
name_pwd, ip_address = address.split('@')
username, pwd = name_pwd.split(':')
host, port = ip_address.split(':')
if '//' in port:
port, vhost = port.split('//')[0], '/'
else:
port, vhost = port.split('/')
return username, pwd, host, port, vhost
def register(func):
'''
register as a task
'''
tasks[func.__qualname__.upper()] = func
return func
tasks = {}
CLIENT_INFO = {'platform': 'Python 3.6.3', 'product': 'async amqp connection', 'version': '0.1.0'}
class Exchange:
def __init__(self, name):
self.name = name
class Queue:
def __init__(self, name):
self.name = name
class Channel:
def __init__(self, channel_number):
self.channel_number = channel_number
class BaseAsyncAmqpConnection:
'''
open connection and channel
but do not contains Basic.Consume, and fetching amqp msg
'''
MAX_DATA_SIZE = 131072
logger_name = 'Magne-AsyncConnection'
client_info = CLIENT_INFO
qos_global = True
def __init__(self, queues, amqp_url, qos, log_level=logging.DEBUG):
self.queues = queues
self.qos = qos
self.log_level = log_level
self.logger = self.get_logger()
self.username, self.pwd, self.host, self.port, self.vhost = parse_amqp_url(amqp_url)
self.start_bodys = []
self.fragment_frame = ''
return
def get_logger(self):
return get_component_log(self.logger_name, self.log_level)
async def assert_recv_method(self, method_class):
data = await self.sock.recv(self.MAX_DATA_SIZE)
frame_obj = pika.frame.decode_frame(data)[1]
try:
if getattr(frame_obj, 'method', None) is None:
assert isinstance(frame_obj, method_class)
else:
assert isinstance(frame_obj.method, method_class)
except Exception as e:
self.logger.error('assert_recv_method : %s, %s, %s' % (method_class, frame_obj, e), exc_info=True)
raise e
return frame_obj
async def send_amqp_procotol_header(self):
amqp_header_frame = pika.frame.ProtocolHeader()
await self.sock.sendall(amqp_header_frame.marshal())
return
async def send_start_ok(self):
start_ok_response = b'\0' + pika.compat.as_bytes(self.username) + b'\0' + pika.compat.as_bytes(self.pwd)
start_ok_obj = pika.spec.Connection.StartOk(client_properties=self.client_info, response=start_ok_response)
frame_value = pika.frame.Method(0, start_ok_obj)
await self.sock.sendall(frame_value.marshal())
return
async def send_tune_ok(self):
tunk = pika.spec.Connection.TuneOk(frame_max=self.MAX_DATA_SIZE)
frame_value = pika.frame.Method(0, tunk)
await self.sock.sendall(frame_value.marshal())
return
async def send_connection_open(self):
connection_open = pika.spec.Connection.Open(insist=True)
frame_value = pika.frame.Method(0, connection_open)
await self.sock.sendall(frame_value.marshal())
# got openok
await self.assert_recv_method(pika.spec.Connection.OpenOk)
return
async def connect(self):
self.sock = await curio.open_connection(self.host, self.port)
self.logger.debug('open amqp connection')
# send amqp header frame
await self.send_amqp_procotol_header()
self.logger.debug('send amqp header')
# got start
await self.assert_recv_method(pika.spec.Connection.Start)
self.logger.debug('get amqp connection.Start')
# send start ok back
await self.send_start_ok()
self.logger.debug('send amqp connection.StartOk')
# got tune
await self.assert_recv_method(pika.spec.Connection.Tune)
self.logger.debug('get amqp connection.Tune')
# send tune ok
await self.send_tune_ok()
self.logger.debug('send amqp connection.TuneOk')
# and we send open
await self.send_connection_open()
self.logger.debug('send amqp connection.Open and get connection.OpenOk')
# open channel
await self.open_channel()
return
async def open_channel(self):
# send Channel.Open
channel_open = pika.spec.Channel.Open()
self.logger.debug('send channel.Open')
frame_value = pika.frame.Method(1, channel_open)
await self.sock.sendall(frame_value.marshal())
# got Channel.Open-Ok
frame_obj = await self.assert_recv_method(pika.spec.Channel.OpenOk)
self.logger.debug('get channel.OpenOk')
self.channel_number = channel_number = frame_obj.channel_number
assert frame_obj.channel_number == 1
self.channel_obj = Channel(channel_number=channel_number)
# create exchange, queue, and update QOS
for queue_name in self.queues:
exchange_name = queue_name
await self.declare_exchange(channel_number, exchange_name)
self.logger.debug('declare exchange %s' % exchange_name)
await self.declare_queue(channel_number, queue_name)
self.logger.debug('declare queue %s' % queue_name)
await self.bind_queue_exchange(channel_number, exchange_name, queue_name, routing_key=queue_name)
self.logger.debug('bind exchange %s and queue %s' % (exchange_name, queue_name))
await self.update_qos(channel_number, self.qos)
self.logger.info('update qos %s' % self.qos)
return
async def declare_exchange(self, channel_number, name):
exchange_declare = pika.spec.Exchange.Declare(exchange=name)
frame_value = pika.frame.Method(channel_number, exchange_declare)
await self.sock.sendall(frame_value.marshal())
await self.assert_recv_method(pika.spec.Exchange.DeclareOk)
return Exchange(name=name)
async def declare_queue(self, channel_number, name):
queue_declare = pika.spec.Queue.Declare(queue=name)
frame_value = pika.frame.Method(channel_number, queue_declare)
await self.sock.sendall(frame_value.marshal())
await self.assert_recv_method(pika.spec.Queue.DeclareOk)
return Queue(name=name)
async def bind_queue_exchange(self, channel_number, exchange, queue, routing_key):
queue_bind = pika.spec.Queue.Bind(queue=queue, exchange=exchange, routing_key=routing_key)
frame_value = pika.frame.Method(channel_number, queue_bind)
await self.sock.sendall(frame_value.marshal())
await self.assert_recv_method(pika.spec.Queue.BindOk)
return
async def update_qos(self, channel_number, qos):
qos_obj = pika.spec.Basic.Qos(prefetch_count=qos, global_=self.qos_global)
frame_value = pika.frame.Method(channel_number, qos_obj)
await self.sock.sendall(frame_value.marshal())
await self.assert_recv_method(pika.spec.Basic.QosOk)
return
async def ack(self, channel_number, delivery_tag):
self.logger.debug('ack: %s, %s' % (channel_number, delivery_tag))
ack = pika.spec.Basic.Ack(delivery_tag=delivery_tag)
frame_value = pika.frame.Method(channel_number, ack)
await self.sock.sendall(frame_value.marshal())
return
async def send_close_connection(self):
try:
# 302: An operator intervened to close the connection for some reason. The client may retry at some later date.
# close channel first
close_channel_frame = pika.spec.Channel.Close(reply_code=302, reply_text='close connection',
class_id=0, method_id=0)
close_channel_frame_value = pika.frame.Method(self.channel_number, close_channel_frame)
await self.sock.sendall(close_channel_frame_value.marshal())
await curio.timeout_after(1, self.assert_recv_method, pika.spec.Channel.CloseOk)
self.channel_number = 0
self.logger.info('closed channel')
close_connection_frame = pika.spec.Connection.Close(reply_code=302, reply_text='close connection',
class_id=0, method_id=0)
frame_value = pika.frame.Method(self.channel_number, close_connection_frame)
await self.sock.sendall(frame_value.marshal())
await curio.timeout_after(1, self.assert_recv_method, pika.spec.Connection.CloseOk)
self.logger.info('closed connection')
except curio.TaskTimeout:
self.logger.error('send close connection frame got CloseOk TaskTimeout')
except ConnectionResetError:
self.logger.error('send close connection frame ConnectionResetError')
except Exception as e:
self.logger.error('send close connection frame exception: %s' % e, exc_info=True)
self.logger.info('closed amqp connection')
return