Getting started with the Dapr Python gRPC service extension

How to get up and running with the Dapr Python gRPC extension package

The Dapr Python SDK provides a built in gRPC server extension module, dapr.ext.grpc, for creating Dapr services.

安装

You can download and install the Dapr gRPC server extension module with:

• Stable
• Development

pip install dapr-ext-grpc

Note

开发包包含的功能和行为将兼容此前发行的 Dapr 运行时。 在安装 dapr-dev 包之前，请务必卸载以前任意稳定版本的 dapr-ext-fastapi 的 Python SDK 扩展包。

pip3 install dapr-ext-grpc-dev

示例

The App object can be used to create a server.

Listen for service invocation requests

The InvokeServiceReqest and InvokeServiceResponse objects can be used to handle incoming requests.

A simple service that will listen and respond to requests will look like:

from dapr.ext.grpc import App, InvokeServiceRequest, InvokeServiceResponse
app = App()
@app.method(name='my-method')
def mymethod(request: InvokeServiceRequest) -> InvokeServiceResponse:
    print(request.metadata, flush=True)
    print(request.text(), flush=True)
    return InvokeServiceResponse(b'INVOKE_RECEIVED', "text/plain; charset=UTF-8")
app.run(50051)

A full sample can be found here.

Subscribe to a topic

from cloudevents.sdk.event import v1
from dapr.ext.grpc import App
app = App()
@app.subscribe(pubsub_name='pubsub', topic='TOPIC_A')
def mytopic(event: v1.Event) -> None:
    print(event.Data(),flush=True)
app.run(50051)

A full sample can be found here.

Setup input binding trigger

from dapr.ext.grpc import App, BindingRequest
app = App()
@app.binding('kafkaBinding')
def binding(request: BindingRequest):
    print(request.text(), flush=True)
app.run(50051)

A full sample can be found here.

相关链接

• PyPi