DiskCache in Flask question

[filak]

Thank you for great library.

I am looking forward seeing it integrated as backend on Flask-Caching (#154). In the meantime I have tried to use diskcache in Flask app anyway. But I cannot get it working yet... I have created a factory:

from pathlib import Path
from diskcache import Cache
from flask import Flask
from flask import _app_ctx_stack as stack

class DiskCache:
    def __init__(self, app=None, **options):
        self.app = app
        self.options = options
        if app is not None:
            self.init_app(self.app, **self.options)

    def init_app(self, app: Flask, **options) -> None:
        self.options = options
        app.teardown_appcontext(self.teardown)

    def configure_app(self, context):
        directory  = context.app.config.get('DISK_CACHE_DIR')
        if not directory:
            raise ValueError(f"Missing DISK_CACHE_DIR setting")
        else:
            cpath = Path( directory )
            if not cpath.is_dir():
                raise ValueError(f"Invalid DISK_CACHE_DIR")    
        
        return directory

    def __getattr__(self, item):
        context = stack.top

        if context is not None:
            if not hasattr(context, 'diskcache'):
                directory  = self.configure_app(context)
                timeout    = context.app.config.get('CACHE_DEFAULT_TIMEOUT', 3600)
                size_limit = context.app.config.get('CACHE_THRESHOLD', 1000)
                context.diskcache = Cache(directory, timeout=timeout, size_limit=size_limit, **self.options)

            return getattr(context.diskcache, item)
        raise RuntimeError("No Application Context")

    def teardown(self, exception):
        ctx = stack.top
        if hasattr(ctx, 'diskcache'):
            ctx.diskcache = None

Then initialize it in my extensions.py - dcache = DiskCache() and import it to main module:

from flask import Flask
from application.extensions import dcache

def create_app(): 
    app = Flask(__name__)
    dcache.init_app(app) 
    return app

The cache.db gets created in the appropriate directory but dcache.set(key, val) seems not working - dcache.count output 0.

I have not figured why... Any hints would be greatly appreciated.

[filak]

I have found out that the factory is not complete. So there is no issue with diskcache.