72 lines
1.9 KiB
Nim
72 lines
1.9 KiB
Nim
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## 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 chronos, chronicles
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import tables, options, sets, sequtils
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import rpc/[messages, message], timedcache
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type
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CacheEntry* = object
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mid*: string
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msg*: Message
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MCache* = ref object of RootObj
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msgs*: TimedCache[Message]
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history*: seq[seq[CacheEntry]]
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historySize*: Natural
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windowSize*: Natural
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proc put*(c: MCache, msg: Message) =
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proc handler(key: string, val: Message) {.gcsafe.} =
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## make sure we remove the message from history
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## to keep things consisten
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c.history.applyIt(
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it.filterIt(it.mid != msg.msgId)
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)
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c.msgs.put(msg.msgId, msg, handler = handler)
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c.history[0].add(CacheEntry(mid: msg.msgId, msg: msg))
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proc get*(c: MCache, mid: string): Option[Message] =
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result = none(Message)
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if mid in c.msgs:
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result = some(c.msgs[mid])
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proc window*(c: MCache, topic: string): HashSet[string] =
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result = initHashSet[string]()
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let len =
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if c.windowSize > c.history.len:
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c.history.len
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else:
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c.windowSize
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if c.history.len > 0:
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for slot in c.history[0..<len]:
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for entry in slot:
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for t in entry.msg.topicIDs:
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if t == topic:
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result.incl(entry.msg.msgId)
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break
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proc shift*(c: MCache) =
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while c.history.len > c.historySize:
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for entry in c.history.pop():
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c.msgs.del(entry.mid)
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c.history.insert(@[])
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proc newMCache*(window: Natural, history: Natural): MCache =
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new result
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result.historySize = history
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result.windowSize = window
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result.history = newSeq[seq[CacheEntry]]()
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result.history.add(@[]) # initialize with empty slot
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result.msgs = newTimedCache[Message](2.minutes)
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