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Proposal: Support Class-Based Syntax for Python Entities

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一周以上
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Issue 类型
功能
描述清晰度
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技术栈
python
领域
backend

调研方向

该 issue 没有指定任何文件或测试。首先检查 DurableEntityContext 周围现有的基于函数的实体处理方式以及链接的 TypeScript 示例，然后确定类方法、初始化、返回的结果和持久化状态应如何映射到当前实体模型。完成的前提是在实现之前就语法和状态处理设计达成一致。

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描述

Enhancement fixed-in-v2

Currently, Entities in Python (and JavaScript) only support function-based syntax, where operations are delineated by a cascade of if-statements. In C#, a class-based syntax is supported, which allows individual operations to be split into methods belonging to a larger class that represents the Entity itself.

Implementing this alternative syntax should not be too difficult, it's mostly just a layer of indirection. Making matters simpler, we already have a community-driven example of how to do this for TypeScript here: https://scale-tone.github.io/2021/03/15/durable-mvc .

As an example for the syntax, consider the following entity function using the current implementation syntax

def entity_function(context: df.DurableEntityContext):
    current_value = context.get_state(lambda: 0)
    operation = context.operation_name
    if operation == "add":
        amount = context.get_input()
        current_value += amount
    elif operation == "reset":
        current_value = 0
    elif operation == "get":
        pass
    
    context.set_state(current_value)
    context.set_result(current_value)

It's class-based syntax alternative would look as follows:

class Counter:
   def __init__(self): # this corresponds to state initializer, or the `lambda: 0` in the function-based syntax
       self.entity_state= 0
 
    def add(self, amount):
        self.entity_state+= amount
        return self.entity_state
    def get(self):
        return self.entity_state
     def reset(self):
        return self.entity_state= 0

Finally, it makes sense to me that the return statement would set the value for context.set_result. A more difficult question is to know what value to save for set_state. One easy solution is to require the state to be under the name self.entity_state but perhaps that's too restrictive. What do others think?

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Python
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