TechEmpower.FrameworkBenchmarks/frameworks/Python/fastapi/app_orjson.py

import asyncio
import asyncpg
import os
from fastapi import FastAPI, Request
from fastapi.responses import HTMLResponse, ORJSONResponse, PlainTextResponse
from fastapi.templating import Jinja2Templates
from random import randint, sample

READ_ROW_SQL = 'SELECT "id", "randomnumber" FROM "world" WHERE id = $1'
WRITE_ROW_SQL = 'UPDATE "world" SET "randomnumber"=$1 WHERE id=$2'
ADDITIONAL_ROW = [0, "Additional fortune added at request time."]


def get_num_queries(queries):
    try:
        query_count = int(queries)
    except (ValueError, TypeError):
        return 1

    if query_count < 1:
        return 1
    if query_count > 500:
        return 500
    return query_count


connection_pool = None

app = FastAPI()

templates = Jinja2Templates(directory="templates")


@app.on_event("startup")
async def setup_database():
    global connection_pool
    connection_pool = await asyncpg.create_pool(
        user=os.getenv("PGUSER", "benchmarkdbuser"),
        password=os.getenv("PGPASS", "benchmarkdbpass"),
        database="hello_world",
        host="tfb-database",
        port=5432,
    )


@app.get("/json")
async def json_serialization():
    return ORJSONResponse({"message": "Hello, world!"})


@app.get("/db")
async def single_database_query():
    row_id = randint(1, 10000)
    async with connection_pool.acquire() as connection:
        number = await connection.fetchval(READ_ROW_SQL, row_id)

    return ORJSONResponse({"id": row_id, "randomNumber": number})


@app.get("/queries")
async def multiple_database_queries(queries = None):
    num_queries = get_num_queries(queries)
    row_ids = sample(range(1, 10000), num_queries)
    worlds = []

    async with connection_pool.acquire() as connection:
        statement = await connection.prepare(READ_ROW_SQL)
        for row_id in row_ids:
            number = await statement.fetchval(row_id)
            worlds.append({"id": row_id, "randomNumber": number})

    return ORJSONResponse(worlds)


@app.get("/fortunes")
async def fortunes(request: Request):
    async with connection_pool.acquire() as connection:
        fortunes = await connection.fetch("SELECT * FROM Fortune")

    fortunes.append(ADDITIONAL_ROW)
    fortunes.sort(key=lambda row: row[1])
    return templates.TemplateResponse("fortune.html", {"fortunes": fortunes, "request": request})


@app.get("/updates")
async def database_updates(queries = None):
    num_queries = get_num_queries(queries)
    updates = [(row_id, randint(1, 10000)) for row_id in sample(range(1, 10000), num_queries)]
    worlds = [{"id": row_id, "randomNumber": number} for row_id, number in updates]

    async with connection_pool.acquire() as connection:
        statement = await connection.prepare(READ_ROW_SQL)
        for row_id, number in updates:
            await statement.fetchval(row_id)
        await connection.executemany(WRITE_ROW_SQL, updates)

    return ORJSONResponse(worlds)


@app.get("/plaintext")
async def plaintext():
    return PlainTextResponse(b"Hello, world!")