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Support different de/serialization strategies

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难度
5/5
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一周以上
新手友好度
25/100
Issue 类型
功能
描述清晰度
需要澄清
活跃度
停滞
技术栈
haskell

调研方向

首先阅读当前的 Process 抽象和 send 入口点,以了解基于 Binary 的序列化是如何接入的。将该 API 与提议的 Serialize 策略以及 Servant 的 MimeRender/MimeUnrender 进行比较;完成的标准是就该抽象达成一致,并更新受影响的类型和示例,同时不破坏与序列化无关的程序。

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描述

discuss enhancement Feature Request

Currently, all messages are de/serialized via the Binary instance.

This is an implementation detail; there is strict required beyond the existence of two functions, encode :: a -> ByteString and decode :: ByteString -> Either String a. However, discussions in the DataHaskell group have raised the point that serialization for data science structures (e.g. dataframes) could be made more efficient by leveraging Parquet over the wire.

I'm thinking of an extension of the current Process monad, to support also a de/serialization strategy. This is strongly inspired by Servant's MimeRender and MimeUnrender classes. Consider:

newtype Process strategy a = Process ... -- Monad is unchanged, type has a new `strategy`

class Serialize strategy a where
    encode :: Proxy strategy -> a -> ByteString
    decode :: Proxy strategy -> ByteString -> Either String a

An example for JSON would be:

import Data.Aeson

data JSON

class (ToJSON a, FromJSON a) => Serialize JSON a where
    encode _ = encode
    decode _ = eitherDecodeStrict 

Then, for the actual message sending e.g. via send, the type would become:

send :: Serialize strategy a => ProcessId -> a -> Process strategy ()

Then, programs that are agnostic of serialization are of type Process strategy a (instead of Process a), while programs which require a specific serialization method, such as JSON, will be of type Process JSON a.

主要语言
Haskell
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