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Getting started with the Dapr client Python SDK

How to get up and running with the Dapr Python SDK

The Dapr client package allows you to interact with other Dapr applications from a Python application.

前提

导入包

The dapr package contains the DaprClient which will be used to create and use a client.

from dapr.clients import DaprClient

构建块

The Python SDK allows you to interface with all of the Dapr building blocks.

调用服务

from dapr.clients import DaprClient

with DaprClient() as d:
    # invoke a method (gRPC or HTTP GET)    
    resp = d.invoke_method('service-to-invoke', 'method-to-invoke', data='{"message":"Hello World"}')

    # for other HTTP verbs the verb must be specified
    # invoke a 'POST' method (HTTP only)    
    resp = d.invoke_method('service-to-invoke', 'method-to-invoke', data='{"id":"100", "FirstName":"Value", "LastName":"Value"}', http_verb='post')

保存 & 获取 应用程序状态

from dapr.clients import DaprClient

with DaprClient() as d:
    # Save state
    d.save_state(store_name="statestore", key="key1", value="value1")

    # Get state
    data = d.get_state(store_name="statestore", key="key1").data

    # Delete state
    d.delete_state(store_name="statestore", key="key1")

Publish & subscribe to messages

发布消息
from dapr.clients import DaprClient

with DaprClient() as d:
    resp = d.publish_event(pubsub_name='pubsub', topic='TOPIC_A', data='{"message":"Hello World"}')
Subscribe to messages
from cloudevents.sdk.event import v1
from dapr.ext.grpc import App
import json

app = App()

@app.subscribe(pubsub_name='pubsub', topic='TOPIC_A')
def mytopic(event: v1.Event) -> None:
    data = json.loads(event.Data())
    print(f'Received: id={data["id"]}, message="{data ["message"]}"' 
          ' content_type="{event.content_type}"',flush=True)

与输出绑定交互

from dapr.clients import DaprClient

with DaprClient() as d:
    resp = d.invoke_binding(name='kafkaBinding', operation='create', data='{"message":"Hello World"}')

检索密钥

from dapr.clients import DaprClient

with DaprClient() as d:
    resp = d.get_secret(store_name='localsecretstore', key='secretKey')

相关链接