32 lines
1 KiB
Nim
32 lines
1 KiB
Nim
import tables, uri
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type
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CacheInfo = object
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valid: bool
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value: string
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CacheHolder = ref object
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caches: Table[string, CacheInfo]
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proc normalizePath(x: string): string =
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let u = parseUri(x)
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result = u.path & (if u.query != "": '?' & u.query else: "")
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proc newCacheHolder*(): CacheHolder =
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new result
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result.caches = initTable[string, CacheInfo]()
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proc invalidate*(cache: CacheHolder, name: string) =
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cache.caches.mget(name.normalizePath()).valid = false
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proc invalidateAll*(cache: CacheHolder) =
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for key, val in mpairs(cache.caches):
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val.valid = false
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template get*(cache: CacheHolder, name: string, grabValue: expr): expr =
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## Check to see if the cache contains value for ``name``. If it does and the
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## cache is valid then doesn't recalculate it but returns the cached version.
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mixin normalizePath
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let nName = name.normalizePath()
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if not (cache.caches.hasKey(nName) and cache.caches[nName].valid):
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cache.caches[nName] = CacheInfo(valid: true, value: grabValue)
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cache.caches[nName].value
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