80 lines
2.3 KiB
Nim
80 lines
2.3 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import tables
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import chronos, chronicles
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logScope:
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topics = "timedcache"
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const Timeout* = 10.seconds # default timeout in ms
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type
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ExpireHandler*[V] = proc(key: string, val: V) {.gcsafe.}
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TimedEntry*[V] = object of RootObj
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val: V
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handler: ExpireHandler[V]
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TimedCache*[V] = ref object of RootObj
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cache*: Table[string, TimedEntry[V]]
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onExpire*: ExpireHandler[V]
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timeout*: Duration
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# TODO: This belong in chronos, temporary left here until chronos is updated
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proc addTimer*(at: Duration, cb: CallbackFunc, udata: pointer = nil) =
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## Arrange for the callback ``cb`` to be called at the given absolute
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## timestamp ``at``. You can also pass ``udata`` to callback.
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addTimer(Moment.fromNow(at), cb, udata)
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proc put*[V](t: TimedCache[V],
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key: string,
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val: V = "",
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timeout: Duration,
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handler: ExpireHandler[V] = nil) =
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trace "adding entry to timed cache", key = key
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t.cache[key] = TimedEntry[V](val: val, handler: handler)
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addTimer(
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timeout,
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proc (arg: pointer = nil) {.gcsafe.} =
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trace "deleting expired entry from timed cache", key = key
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if key in t.cache:
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let entry = t.cache[key]
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t.cache.del(key)
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if not isNil(entry.handler):
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entry.handler(key, entry.val)
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)
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proc put*[V](t: TimedCache[V],
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key: string,
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val: V = "",
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handler: ExpireHandler[V] = nil) =
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t.put(key, val, t.timeout, handler)
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proc contains*[V](t: TimedCache[V], key: string): bool =
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t.cache.contains(key)
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proc del*[V](t: TimedCache[V], key: string) =
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trace "deleting entry from timed cache", key = key
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t.cache.del(key)
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proc get*[V](t: TimedCache[V], key: string): V =
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t.cache[key].val
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proc `[]`*[V](t: TimedCache[V], key: string): V =
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t.get(key)
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proc `[]=`*[V](t: TimedCache[V], key: string, val: V): V =
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t.put(key, val)
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proc newTimedCache*[V](timeout: Duration = Timeout): TimedCache[V] =
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new result
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result.cache = initTable[string, TimedEntry[V]]()
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result.timeout = timeout
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