Cache

Application caches various values across it’s whole beauty. It’s mostly because of performance speed ups.

Cached values:

• Transactions performance + asset allocation chart data

  • keys:

    • shares-transaction-performance-and-assets

    • shares-transaction-profit-performance

    • coins-transaction-performance-and-assets

    • coins-transaction-profit-performance

    • indexes-transaction-performance-and-assets

    • indexes-transaction-profit-performance

    • etfs-transaction-performance-and-assets

    • etfs-transaction-profit-performance

  • timeout: settings TRANSACTIONS_CACHE_TIMEOUT (1 day)

  • invalidated by:

    • shares – keys:

      • shares/tasks.py - fetch_historical_data()

      • transactions/views.py - BaseTransactionManipulationView - a new transaction added/updated

    • indexes – keys:

      • indexes/tasks.py - fetch_historical_data()

      • transactions/views.py - BaseTransactionManipulationView - a new transaction added/updated

    • etfs – keys:

      • etfs/tasks.py - fetch_historical_data()

      • transactions/views.py - BaseTransactionManipulationView - a new transaction added/updated

    • coins – keys:

      • coins/tasks.py - fetch_historical_data()

      • transactions/views.py - BaseTransactionManipulationView - a new transaction added/updated

• Transactions basic stats

  • keys: transactions-basic-stats-user-X-closed-Y (X is user PK, Y is closed flag [True, False, None])

  • timeout: -

  • invalidated by:

    • invalidated by:

      • shares – keys:

        • shares/tasks.py - fetch_historical_data()

        • transactions/views.py - BaseTransactionManipulationView - a new transaction added/updated

      • indexes – keys:

        • indexes/tasks.py - fetch_historical_data()

        • transactions/views.py - BaseTransactionManipulationView - a new transaction added/updated

      • etfs – keys:

        • etfs/tasks.py - fetch_historical_data()

        • transactions/views.py - BaseTransactionManipulationView - a new transaction added/updated

      • coins – keys:

        • coins/tasks.py - fetch_historical_data()

        • transactions/views.py - BaseTransactionManipulationView - a new transaction added/updated

• Item price percentage day change

  • key: item-X-days-perc-change-Y (X is item PK, Y is number of days)

  • timeout: settings PRICE_PERCENTAGE_CHANGE_CACHE_TIMEOUT (1 day)

  • invalidated by:

    • shares/tasks.py - fetch_historical_data()

    • coins/tasks.py - fetch_historical_data()

• Item price percentage day change - compounded

  • key: item-X-days-perc-change-Y-compounded (X is item PK, Y is number of days)

  • timeout: settings PRICE_PERCENTAGE_CHANGE_CACHE_TIMEOUT (1 day)

  • invalidated by:

    • shares/tasks.py - fetch_historical_data()

    • coins/tasks.py - fetch_historical_data()

• Item ATH

  • key: item-X-ath

  • timeout: settings ATH_TIMEOUT (1 day)

  • invalidated by:

    • shares/tasks.py - fetch_historical_data()

    • coins/tasks.py - fetch_historical_data()

    • indexes/tasks.py - fetch_historical_data()

    • etfs/tasks.py - fetch_historical_data()

• Item drawdown

  • key: item-X-drawdown

  • timeout: settings ATH_TIMEOUT (1 day)

  • invalidated by:

    • shares/tasks.py - fetch_historical_data()

    • coins/tasks.py - fetch_historical_data()

    • indexes/tasks.py - fetch_historical_data()

    • etfs/tasks.py - fetch_historical_data()

• Item last price

  • key: item-X-last-price

  • timeout: settings LAST_PRICE_TIMEOUT (1 day)

  • invalidated by: -

• Current item market price + change (fetched from YAHOO!)

  • key: item-X-current-price (X is the item PK)

  • timeout: settings ITEM_CURRENT_PRICE_TIMEOUT (1 hour)

  • invalidated by: -

• Item intraday market price data (the eye) (fetched from YAHOO!)

  • key: item-X-market-live (X is the item PK)

  • timeout: settings ITEM_MARKET_LIVE_CACHE_TIMEOUT (5 minutes)

  • invalidated by: -

• SMA

  • key: item-X-sma-Y (X is item PK, Y is SMA period (20, 50, …))

  • timeout: settings SMA_TIMEOUT (1 day)

  • invalidated by:

    • shares/tasks.py - fetch_historical_data()

    • coins/tasks.py - fetch_historical_data()

    • indexes/tasks.py - fetch_historical_data()

    • etfs/tasks.py - fetch_historical_data()

• 52 weeks low/high

  • key: item-X-52-weeks-low-high (X is the item PK)

  • timeout: settings LOW_HIGH_52_WEEKS_TIMEOUT (1 day)

  • invalidated by:

    • shares/tasks.py - fetch_historical_data()

    • coins/tasks.py - fetch_historical_data()

    • indexes/tasks.py - fetch_historical_data()

    • etfs/tasks.py - fetch_historical_data()

• Application version number

  • key: version

  • timeout: forever

  • invalidated by: -

Flush cache

To update/re-cache cached values there are 2 approaches:

Selective (per item):

Item.objects.get(symbol="FB").update_cache()

Global for all items:

$ docker exec -it richy-redis redis-cli flushall

Browsing the cache

The admin includes django-redisboard for browsing the live Redis instance at /admin/redisboard/. Because Django’s cache framework stores values as pickled bytes, the default redisboard renderer shows them as unreadable binary. The project ships a custom decoder – richy.core.redisboard.PickleDecoder – wired in via REDISBOARD_DECODER_CLASS so cached values render as their original Python objects (numbers, dataframes, dicts).