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caching: fix diskcache implementation

master
pictuga 2021-11-08 21:57:43 +01:00
parent 44a6b2591d
commit c71cf5d5ce
2 changed files with 11 additions and 6 deletions
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10
README.md
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@ -40,7 +40,7 @@ Some features of morss:
- Follow 301/meta redirects - Follow 301/meta redirects
- Recover xml feeds with corrupt encoding - Recover xml feeds with corrupt encoding
- Supports gzip-compressed http content - Supports gzip-compressed http content
- HTTP caching with 3 different backends (in-memory/sqlite/mysql) - HTTP caching with different backends (in-memory/sqlite/mysql/redis/diskcache)
- Works as server/cli tool - Works as server/cli tool
- Deobfuscate various tracking links - Deobfuscate various tracking links
@ -60,8 +60,8 @@ Full installation (including optional dependencies)
pip install git+https://git.pictuga.com/pictuga/morss.git#[full] pip install git+https://git.pictuga.com/pictuga/morss.git#[full]
``` ```
The full install includes mysql and redis (possible cache backends). Otherwise, The full install includes mysql, redis and diskcache (possible cache backends).
only in-memory and sqlite3 caches are available. Otherwise, only in-memory and sqlite3 caches are available.
The dependency `lxml` is fairly long to install (especially on Raspberry Pi, as The dependency `lxml` is fairly long to install (especially on Raspberry Pi, as
C code needs to be compiled). If possible on your distribution, try installing C code needs to be compiled). If possible on your distribution, try installing
@ -390,12 +390,14 @@ will be cleared every time the program is run). Path can be defined with
environment variables: `MYSQL_USER`, `MYSQL_PWD`, `MYSQL_DB`, `MYSQL_HOST` environment variables: `MYSQL_USER`, `MYSQL_PWD`, `MYSQL_DB`, `MYSQL_HOST`
- `CACHE=redis`: Redis cache. Connection can be defined with the following - `CACHE=redis`: Redis cache. Connection can be defined with the following
environment variables: `REDIS_HOST`, `REDIS_PORT`, `REDIS_DB`, `REDIS_PWD` environment variables: `REDIS_HOST`, `REDIS_PORT`, `REDIS_DB`, `REDIS_PWD`
- `CACHE=diskcache`: disk-based cache. Target directory canbe defined with
`DISKCAHE_DIR`.
To limit the size of the cache: To limit the size of the cache:
- `CACHE_SIZE` sets the target number of items in the cache (further items will - `CACHE_SIZE` sets the target number of items in the cache (further items will
be deleted but the cache might be temporarily bigger than that). Defaults to 1k be deleted but the cache might be temporarily bigger than that). Defaults to 1k
entries. entries. NB. When using `diskcache`, this is the cache max size in Bytes.
- `CACHE_LIFESPAN` (seconds) sets how often the cache must be trimmed (i.e. cut - `CACHE_LIFESPAN` (seconds) sets how often the cache must be trimmed (i.e. cut
down to the number of items set in `CACHE_SIZE`). Defaults to 1min. down to the number of items set in `CACHE_SIZE`). Defaults to 1min.

7
morss/caching.py
View File

@ -168,11 +168,14 @@ class DiskCacheHandler(BaseCache):
def __init__(self, directory=None, **kwargs): def __init__(self, directory=None, **kwargs):
self.cache = diskcache.Cache(directory=directory, eviction_policy='least-frequently-used', **kwargs) self.cache = diskcache.Cache(directory=directory, eviction_policy='least-frequently-used', **kwargs)
def __del__(self):
self.cache.close()
def trim(self): def trim(self):
self.cache.cull() self.cache.cull()
def __getitem__(self, key): def __getitem__(self, key):
return self.cache['key'] return self.cache[key]
def __setitem__(self, key, data): def __setitem__(self, key, data):
self.cache.set(key, data) self.cache.set(key, data)
@ -203,7 +206,7 @@ if 'CACHE' in os.environ:
elif os.environ['CACHE'] == 'diskcache': elif os.environ['CACHE'] == 'diskcache':
default_cache = DiskCacheHandler( default_cache = DiskCacheHandler(
directory = os.getenv('DISKCAHE_DIR', '/tmp/morss-diskcache'), directory = os.getenv('DISKCAHE_DIR', '/tmp/morss-diskcache'),
size_limit = CACHE_SIZE * 102400 # assuming 1 cache item is 100kiB size_limit = CACHE_SIZE # in Bytes
) )
else: else: