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https://github.com/zerlok/BrokRPC

framework for gRPC like server-client communication over message brokers
https://github.com/zerlok/BrokRPC

amqp grpc message-broker message-queue protobuf python

Last synced: 11 months ago
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framework for gRPC like server-client communication over message brokers

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# BrokRPC

[![Latest Version](https://img.shields.io/pypi/v/BrokRPC.svg)](https://pypi.python.org/pypi/BrokRPC)
[![Python Supported versions](https://img.shields.io/pypi/pyversions/BrokRPC.svg)](https://pypi.python.org/pypi/BrokRPC)
[![MyPy Strict](https://img.shields.io/badge/mypy-strict-blue)](https://mypy.readthedocs.io/en/stable/getting_started.html#strict-mode-and-configuration)
[![Test Coverage](https://codecov.io/gh/zerlok/BrokRPC/branch/main/graph/badge.svg)](https://codecov.io/gh/zerlok/BrokRPC)
[![Downloads](https://img.shields.io/pypi/dm/BrokRPC.svg)](https://pypistats.org/packages/BrokRPC)
[![GitHub stars](https://img.shields.io/github/stars/zerlok/BrokRPC)](https://github.com/zerlok/BrokRPC/stargazers)

BrokRPC (**Brok**er **R**emote **P**rocedure **C**all) is a framework for gRPC like server-client communication over
message brokers.

## key features

* strict typing (even `disallow_any_expr=true`)
* same protobuf structures as in gRPC
* similar calls as in gRPC
* unary-unary
* (TODO) unary-stream
* (TODO) stream-unary
* (TODO) stream-stream
* declarative style, abstract from broker commands (such as declare_exchange / queue_bind)
* publisher & consumer middlewares
* message serializers

## codegen

You can generate python code for server & client from `.proto` files.
The [pyprotostuben](https://github.com/zerlok/pyprotostuben) project provides protoc plugin `protoc-gen-brokrpc`. See
pyprotostuben project example for more details.

You may configure codegen output using protobuf extensions from [buf schema registry](https://buf.build/zerlok/brokrpc).

## supported brokers & protocols

* [AMQP](https://www.rabbitmq.com/tutorials/amqp-concepts)
* [aiormq](https://github.com/mosquito/aiormq)
* (TODO) redis
* (TODO) kafka
* (TODO) NATS

## usage

[pypi package](https://pypi.python.org/pypi/BrokRPC)

install with your favorite python package manager

```shell
pip install BrokRPC[aiormq]
```

### Broker

use Broker as high level API to create consumers & publishers

```python
from brokrpc.broker import Broker

# create & connect to broker with specified params
async with Broker(...) as broker:
assert broker.is_connected
# work with broker
...
```

### Consumer

```python
import asyncio
from brokrpc.broker import Broker
from brokrpc.message import Message
from brokrpc.options import BindingOptions, QueueOptions, ExchangeOptions
from brokrpc.serializer.json import JSONSerializer

async def register_consumer(broker: Broker) -> None:
# define consumer function (you also can use async function & `Consumer` interface).
def consume_binary_message(message: Message[bytes]) -> None:
print(message)

# consumer is not attached yet

async with broker.consumer(consume_binary_message, BindingOptions(binding_keys=["my-consumer"])):
# in this code block consumer is attached to broker and can receive messages
...

# outside CM consumer is detached from broker and cannot receive messages

async def consume_json(message: Message[object]) -> bool:
obj = message.body
if not isinstance(obj, dict):
return False

username = obj.get("username")
if not username:
return False

print(f"Hello, {username}")
await asyncio.sleep(1.0) # simulate long processing

return True

async with broker.consumer(
consume_json,
BindingOptions(
exchange=ExchangeOptions(name="json"),
binding_keys=["my-json-consumer"],
queue=QueueOptions(name="jsons", auto_delete=True),
),
serializer=JSONSerializer(),
):
...
```

### ConsumerMiddlewares

...

### Publisher

```python
from brokrpc.broker import Broker
from brokrpc.message import AppMessage
from brokrpc.serializer.json import JSONSerializer

async def publish_messages(broker: Broker) -> None:
async with broker.publisher() as pub:
# in this code block publisher is attached to broker and can send messages
await pub.publish(AppMessage(body=b"this is a binary message", routing_key="test-consumer"))

async with broker.publisher(serializer=JSONSerializer()) as json_pub:
await json_pub.publish(AppMessage(body={"username": "John Smith"}, routing_key="my-json-consumer"))
```

### Publisher Middlewares

...

### Message

* `Message`
* `AppMessage`
* `PackedMessage`
* `UnpackedMessage`

### Serializer

* `JSONSerializer`
* `ProtobufSerializer`

### RPC Server

* `Server`

### RPC Handler

...

### RPC Client

* `Client`

### RPC Caller

...

## RPC example

### RPC server

run server process with following code

```python
import asyncio

from brokrpc.broker import Broker
from brokrpc.options import ExchangeOptions
from brokrpc.rpc.model import Request
from brokrpc.rpc.server import Server
from brokrpc.serializer.json import JSONSerializer

# define app RPC handler
async def handle_request(request: Request[object]) -> str:
print(f"{request=!s}")
print(f"{request.body=}")
return f"I greet you, {request.body}"

async def main() -> None:
# create broker & RPC server
broker = Broker(
options="amqp://guest:guest@localhost:5672/",
default_exchange=ExchangeOptions(name="simple-test-app"),
)
server = Server(broker)

# register RPC handler
server.register_unary_unary_handler(
func=handle_request,
routing_key="test-greeting",
serializer=JSONSerializer(),
)

# connect to broker
async with broker:
# start RPC server until SIGINT or SIGTERM
await server.run_until_terminated()

if __name__ == "__main__":
asyncio.run(main())
```

### RPC client

make a call to RPC server via RPC client with following code

```python
import asyncio

from brokrpc.broker import Broker
from brokrpc.options import ExchangeOptions
from brokrpc.rpc.client import Client
from brokrpc.serializer.json import JSONSerializer

async def main() -> None:
async with (
# create & connect to broker
Broker(
options="amqp://guest:guest@localhost:5672/",
default_exchange=ExchangeOptions(name="simple-test-app"),
) as broker,
# create RPC client & get RPC caller
Client(broker).unary_unary_caller(
routing_key="test-greeting",
serializer=JSONSerializer(),
) as caller,
):
# publish app message & receive RPC response
response = await caller.invoke("John")

print(response)
print(f"{response.body=}")

if __name__ == "__main__":
asyncio.run(main())
```