Flask计数器

计数器实现方式：

1. 使用session
2. 使用多线程
3. 使用内存数据库，如redis

• 使用session

# -*- coding: utf-8 -*-
from flask import Flask, jsonify, session

app = Flask(__name__)
app.secret_key = 'test'


@app.route('/index')
def news():
    if session.get('click', None) is None:
        session['click'] = 0
    else:
        session['click'] += 1
    return jsonify(click=session['click'])


if __name__ == "__main__":
    app.run()

• 使用多线程

# -*- coding: utf-8 -*-
from flask import Flask, jsonify
from multiprocessing import Value

app = Flask(__name__)
counter = Value('i', 0)  # i表示有符号整数


@app.route('/index')
def news():
    with counter.get_lock():
        counter.value += 1
    return jsonify(click=counter.value)


if __name__ == "__main__":
    app.run()

• 使用redis

# -*- coding: utf-8 -*-
import redis
from flask import Flask, jsonify


app = Flask(__name__)
# redis connection
kv_store = redis.Redis(host='0.0.0.0', port=6379, db=0)


@app.route('/index')
def news():
    c = kv_store.incr('count')
    return jsonify(count=c)


if __name__ == "__main__":
    app.run()