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《Django 5 By Example》阅读笔记：p679-p765

article 2024/11/24 7:29:51

《Django 5 By Example》学习第10天，p679-p765总结，总计87页。

一、技术总结

1.channel

书里通过聊天软件功能演示Django中channel以及异步编程的应用，本人对这块不是很熟悉，不做评价。

2.deployment(部署)

services:
  db:
    image: postgres:16.2
    restart: always
    volumes:
      - ./data/db:/var/lib/postgresql/data
    environment:
      - POSTGRES_DB=postgres
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres

  cache:
    image: redis:7.2.4
    restart: always
    volumes:
      - ./data/cache:/data

  web:
    build: .
    command: ["./wait-for-it.sh", "db:5432", "--",
              "uwsgi", "--ini", "/code/config/uwsgi/uwsgi.ini"]
    restart: always
    volumes:
      - .:/code
    ports:
      - "8000:8000"
    environment:
      - DJANGO_SETTINGS_MODULE=educa.settings.prod
      - POSTGRES_DB=postgres
      - POSTGRES_USER=postgres
      - POSTGRES_PASSWORD=postgres
    depends_on:
      - db
      - cache
  ...(其它内容省略)

看了作者的写的docker-compose.yml，这里要多说两句：

(1)在docker-compose.yml里面包含build命令，本人觉得这是一种不好的写法。因为重启服务的次数是远远多于build次数的，同时也没有必要每次都build。

(2)服务命名为db，本人觉得这是一种不好的写法。因为db的含义不明确，可以指“MySQL，Oracle，MongoDB， Redis”等，这里使用的是Postgresql数据库，那么直接用postgresql命名更好。

(3)数据库命名为postgres，本人觉得这是一种不好的写法。因为含义不明确。

二、英语总结(生词：3)

1.engage

(1)engage: en-(“in”) + gage(“a pledge, commitment, or security，保证，承诺”)。

p679, In this chapter, you will develop a chat server for students using Django Channels, enabling students to engage in real-time messaging within course chat rooms. engage的用法比较多，这里的意思是：to get involved in sth, to take part in sth.

2.emerging

p685, ASGI is the emerging Python standard for asynchronous web servers and applications.

(1)emerge: e-(“out, from”) + mergere("to dip ")

vi. to rise from, to rise out of.

(2) emerging

adj. starting to exist.

3.duplex

p685, WebSockets provide full-duplex communication by establishing a persistent, open, bidirectional Transmission Control Protocol (TCP) connection between servers and clients.

(1)duplex: duo-(“two”) + plex(“to plait(把…编成辫子)”)

adj. composed of two parts. n. house or other building so divided that it forms two dwelling places.

上面的full-duplex communication的意思是(全双工通信)。