codesnips

flask

python 
import csv


class _LineBuffer:
    def __init__(self):
        self._data = ""

Stream a Large CSV Export in Chunks from a Flask Endpoint

flask streaming csv
by codesnips 3 tabs
python 
import base64
import json
from datetime import datetime


class InvalidCursor(Exception):

Cursor-Based Pagination for a Flask JSON API Blueprint

flask pagination cursor
by codesnips 3 tabs
python 
import io
import os
from uuid import uuid4
from PIL import Image, UnidentifiedImageError

ALLOWED_FORMATS = {"JPEG", "PNG", "WEBP"}

Validate and Generate Image Thumbnails on a Flask Upload Endpoint With Pillow

flask pillow image-processing
by codesnips 3 tabs
python 
from datetime import datetime
from app.extensions import db


class IdempotencyKey(db.Model):
    __tablename__ = "idempotency_keys"

Idempotency-Key Deduplication for POST Requests in a Flask Blueprint

flask idempotency postgres
by codesnips 3 tabs
python 
from werkzeug.routing import BaseConverter
from werkzeug.exceptions import NotFound
from flask import abort


class ModelConverter(BaseConverter):

Auto-Loading SQLAlchemy Models in Flask Routes With a Custom URL Converter

flask werkzeug sqlalchemy
by codesnips 3 tabs
python 
import hashlib
from functools import wraps

from flask import request, make_response
from redis import Redis

Flask ETag Caching for an Expensive Endpoint with Conditional 304 Handling

flask http-caching etag
by codesnips 2 tabs
python 
import hashlib
import json


def compute_etag(payload, weak=False):
    body = json.dumps(payload, sort_keys=True, separators=(",", ":"))

Conditional GET with ETag Generation and 304 Not Modified in Flask

flask http caching
by codesnips 3 tabs
python 
import time
from collections import namedtuple

from sqlalchemy import text

CheckResult = namedtuple("CheckResult", ["name", "healthy", "latency_ms", "detail"])

Flask Health-Check Blueprint Reporting Database and Redis Status as JSON

flask health-check observability
by codesnips 3 tabs