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import asyncio
import functools
import json
import logging
import os
import ssl
import time
from enum import Enum
from typing import Dict, Optional, Literal, Union
import msgpack
import pika
from pika.exceptions import AMQPConnectionError
from pydantic import BaseModel, field_validator
logger = logging.getLogger(__name__)
def sync(f):
@functools.wraps(f)
def wrapper(*args, **kwargs):
return asyncio.get_event_loop().run_until_complete(f(*args, **kwargs))
return wrapper
class Priority(Enum):
LOW = 1
NORMAL = 5
HIGH = 10
class Headers(BaseModel):
job_id: str
priority: Priority
task_type: Optional[str] = None
@field_validator('priority', mode='before')
@classmethod
def _convert_priority(cls, value):
if isinstance(value, Priority):
return value
return Priority[value]
class RabbitMQConfig(BaseModel):
host: str
port: int
username: str
password: str
protocol: str
class BasicPikaClient:
def __init__(self):
self.username = os.environ.get('RABBITMQ_USER', '')
self.password = os.environ.get('RABBITMQ_PASSWD', '')
self.host = os.environ.get('RABBITMQ_HOST', 'localhost')
self.port = os.environ.get('RABBITMQ_PORT', 5672)
self.protocol = "amqp"
self._init_connection_parameters()
self._connect()
def _connect(self):
tries = 0
while True:
try:
self.connection = pika.BlockingConnection(self.parameters)
self.channel = self.connection.channel()
if self.connection.is_open:
break
except (AMQPConnectionError, Exception) as e:
time.sleep(5)
tries += 1
if tries == 20:
raise AMQPConnectionError(e)
def _init_connection_parameters(self):
if any([self.username, self.password]):
self.credentials = pika.PlainCredentials(self.username, self.password)
self.parameters = pika.ConnectionParameters(
host=self.host,
port=int(self.port),
virtual_host="/",
credentials=self.credentials,
)
else:
self.parameters = pika.ConnectionParameters(
self.host,
int(self.port),
"/",
)
if self.protocol == "amqps":
# SSL Context for TLS configuration of Amazon MQ for RabbitMQ
ssl_context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
ssl_context.set_ciphers("ECDHE+AESGCM:!ECDSA")
self.parameters.ssl_options = pika.SSLOptions(context=ssl_context)
def check_connection(self):
if not self.connection or self.connection.is_closed:
self._connect()
def close(self):
self.channel.close()
self.connection.close()
def declare_queue(
self, queue_name, exclusive: bool = False, max_priority: int = 10
):
self.check_connection()
logger.debug(f"Trying to declare queue({queue_name})...")
self.channel.queue_declare(
queue=queue_name,
exclusive=exclusive,
durable=True,
arguments={"x-max-priority": max_priority} if max_priority > 0 else None
)
def declare_exchange(self, exchange_name: str, exchange_type: str = "direct"):
self.check_connection()
self.channel.exchange_declare(
exchange=exchange_name, exchange_type=exchange_type
)
def bind_queue(self, exchange_name: str, queue_name: str, routing_key: str):
self.check_connection()
self.channel.queue_bind(
exchange=exchange_name, queue=queue_name, routing_key=routing_key
)
def unbind_queue(self, exchange_name: str, queue_name: str, routing_key: str):
self.channel.queue_unbind(
queue=queue_name, exchange=exchange_name, routing_key=routing_key
)
class BasicMessageSender(BasicPikaClient):
message_encoding_type: Literal['bytes', 'json'] = 'json'
def encode_message(self, body: Union[Dict, str], encoding_type: str = "bytes"):
if encoding_type == "bytes":
return msgpack.packb(body)
elif encoding_type == "json":
if isinstance(body, dict):
return json.dumps(body)
return body
else:
raise NotImplementedError
def send_message(
self,
exchange_name: str,
routing_key: str,
body: Union[Dict, str],
headers: Optional[Headers],
):
body = self.encode_message(body=body, encoding_type=self.message_encoding_type)
properties = pika.BasicProperties(delivery_mode=pika.spec.PERSISTENT_DELIVERY_MODE,
priority=headers.priority.value if headers else None,
headers=headers.model_dump() if headers else None)
self.check_connection()
self.channel.basic_publish(
exchange=exchange_name,
routing_key=routing_key,
body=body,
properties=properties,
)
logger.debug(
f"Sent message. Exchange: {exchange_name}, Routing Key: {routing_key}, Body: {body[:128]}"
)
class BasicMessageReceiver(BasicPikaClient):
def __init__(self):
super().__init__()
self.channel_tag = None
def decode_message(self, body):
if type(body) == bytes:
return json.loads(body)
else:
raise NotImplementedError
def get_message(self, queue_name: str, auto_ack: bool = False):
method_frame, header_frame, body = self.channel.basic_get(
queue=queue_name, auto_ack=auto_ack
)
if method_frame:
logger.debug(f"{method_frame}, {header_frame}, {body}")
return method_frame, header_frame, body
else:
logger.debug("No message returned")
return None
def consume_messages(self, queue, callback):
self.check_connection()
self.channel_tag = self.channel.basic_consume(
queue=queue, on_message_callback=callback, auto_ack=True
)
logger.debug(" [*] Waiting for messages. To exit press CTRL+C")
self.channel.start_consuming()
def cancel_consumer(self):
if self.channel_tag is not None:
self.channel.basic_cancel(self.channel_tag)
self.channel_tag = None
else:
logger.error("Do not cancel a non-existing job")
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