Compose4py

Onion Model in Python. Pyton 洋葱模型

pip install compose4py

Installation

Usage

Import compose4py:

from compose4py import Compose

All the usual function composition you know and love:

    def mw_1(ctx, loader_context):
        print("mw_1: %s" % ctx)
        print("mw_1 loader_context: %s" % loader_context)
        ctx += ":mw1"
        # call the next middleware and waiting the new ctx
        ctx = yield ctx
        # use the latest ctx and process more logic
        ctx += ":post_mw1"
        return ctx

    def mw_2(ctx):
        print("mw_2: %s" % ctx)
        ctx += ":mw2"
        ctx = yield ctx
        ctx += ":post_mw2"
        return ctx

    def mw_3(ctx):
        print("mw_3: %s" % ctx)
        ctx += ":mw3"
        return ctx

    compose = Compose(mw_1, mw_2, mw_3, loader_context = {"foo": "bar"})
    result = compose("foo")
    print("final: %s" % result)
    # final: foo:mw1:mw2:mw3:post_mw2:post_mw1

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scrapy

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