sanic/examples/sanic_asyncpg_example.py

""" To run this example you need additional asyncpg package

"""
import os
import asyncio

import uvloop
from asyncpg import create_pool

from sanic import Sanic
from sanic.response import json

DB_CONFIG = {
    'host': '<host>',
    'user': '<username>',
    'password': '<password>',
    'port': '<port>',
    'database': '<database>'
}

def jsonify(records):
    """
    Parse asyncpg record response into JSON format
    """
    return [{key: value for key, value in
             zip(r.keys(), r.values())} for r in records]

app = Sanic(__name__)

@app.listener('before_server_start')
async def create_db(app, loop):
    """
    Create some table and add some data
    """
    async with create_pool(**DB_CONFIG) as pool:
        async with pool.acquire() as connection:
            async with connection.transaction():
                await connection.execute('DROP TABLE IF EXISTS sanic_post')
                await connection.execute("""CREATE TABLE sanic_post (
                                        id serial primary key,
                                        content varchar(50),
                                        post_date timestamp
                                    );""")
                for i in range(0, 100):
                    await connection.execute(f"""INSERT INTO sanic_post
                        (id, content, post_date) VALUES ({i}, {i}, now())""")


@app.route("/")
async def handler(request):
    async with create_pool(**DB_CONFIG) as pool:
        async with pool.acquire() as connection:
            async with connection.transaction():
                results = await connection.fetch('SELECT * FROM sanic_post')
                return json({'posts': jsonify(results)})


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8000)