lexonomy/lexonomy_editor_plugin_system
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Handling cache with ETag and If-None-Match headers.

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This commit is contained in:
Ozbolt Menegatti 2019-09-17 10:35:14 +02:00
parent 3dc2ca0ebc
commit 44915ea014
1 changed files with 9 additions and 5 deletions
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12
plugin-server.py
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@ -13,8 +13,8 @@ then $LOCATION$ gets the value of http://example.com/myplugin
import sys import sys
import os.path import os.path
import mimetypes import mimetypes
import hashlib import string
from base64 import b64encode import random
import redis import redis
from flask import Flask, Response, request from flask import Flask, Response, request
@ -56,6 +56,10 @@ def check_cache(full_path):
return status return status
def generate_etag(N=12):
return ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(N))
@app.route("/<plugin>/<path:path>") @app.route("/<plugin>/<path:path>")
def plugin_file(plugin, path): def plugin_file(plugin, path):
full_path = "{}/{}".format(plugin, path) full_path = "{}/{}".format(plugin, path)
@ -83,11 +87,11 @@ def plugin_file(plugin, path):
resp = Response(result, mimetype=mt) resp = Response(result, mimetype=mt)
resp.headers.add('Access-Control-Allow-Origin', '*') resp.headers.add('Access-Control-Allow-Origin', '*')
resp.headers.add('ETag', generate_etag())
resp.status_code = status_code resp.status_code = status_code
# return everything if cached response is not allowed # return everything if cached response is not allowed
if 'Cache-Control' in request.headers: if 'If-None-Match' not in request.headers:
if request.headers['Cache-Control'] in ('no-cache', 'max-age=0'):
resp.status_code = 200 resp.status_code = 200
return resp return resp