109 lines
2.3 KiB
Nim
109 lines
2.3 KiB
Nim
|
# codex-dht - Codex DHT
|
||
|
|
# Copyright (c) 2022 Status Research & Development GmbH
|
||
|
|
# Licensed and distributed under either of
|
||
|
|
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
|
||
|
|
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
|
||
|
|
# at your option. This file may not be copied, modified, or distributed except according to those terms.
|
||
|
|
|
||
|
|
{.push raises: [Defect].}
|
||
|
|
|
||
|
|
import std/sequtils
|
||
|
|
|
||
|
|
import pkg/chronicles
|
||
|
|
import pkg/libp2p
|
||
|
|
|
||
|
|
import ../node
|
||
|
|
import ../lru
|
||
|
|
import ./common
|
||
|
|
|
||
|
|
const
|
||
|
|
MaxProvidersEntries* = 1000'u # one thousand records
|
||
|
|
MaxProvidersPerEntry* = 200'u # providers per entry
|
||
|
|
|
||
|
|
logScope:
|
||
|
|
topics = "discv5 providers cache"
|
||
|
|
|
||
|
|
type
|
||
|
|
Providers* = LRUCache[PeerId, SignedPeerRecord]
|
||
|
|
ItemsCache* = LRUCache[NodeId, Providers]
|
||
|
|
|
||
|
|
ProvidersCache* = object
|
||
|
|
disable: bool
|
||
|
|
cache*: ItemsCache
|
||
|
|
maxProviders*: int
|
||
|
|
|
||
|
|
func add*(
|
||
|
|
self: var ProvidersCache,
|
||
|
|
id: NodeId,
|
||
|
|
provider: SignedPeerRecord) =
|
||
|
|
|
||
|
|
if self.disable:
|
||
|
|
return
|
||
|
|
|
||
|
|
var providers =
|
||
|
|
if id notin self.cache:
|
||
|
|
Providers.init(self.maxProviders.int)
|
||
|
|
else:
|
||
|
|
self.cache.get(id).get()
|
||
|
|
|
||
|
|
let
|
||
|
|
peerId = provider.data.peerId
|
||
|
|
|
||
|
|
trace "Adding provider to cache", id, peerId
|
||
|
|
providers.put(peerId, provider)
|
||
|
|
self.cache.put(id, providers)
|
||
|
|
|
||
|
|
proc get*(
|
||
|
|
self: var ProvidersCache,
|
||
|
|
id: NodeId,
|
||
|
|
start = 0,
|
||
|
|
stop = MaxProvidersPerEntry.int): seq[SignedPeerRecord] =
|
||
|
|
|
||
|
|
if self.disable:
|
||
|
|
return
|
||
|
|
|
||
|
|
if id in self.cache:
|
||
|
|
let
|
||
|
|
recs = self.cache.get(id).get
|
||
|
|
|
||
|
|
let
|
||
|
|
providers = toSeq(recs)[start..<min(recs.len, stop)]
|
||
|
|
|
||
|
|
trace "Providers already cached", id, len = providers.len
|
||
|
|
return providers
|
||
|
|
|
||
|
|
func remove*(
|
||
|
|
self: var ProvidersCache,
|
||
|
|
id: NodeId,
|
||
|
|
peerId: PeerId) =
|
||
|
|
|
||
|
|
if self.disable:
|
||
|
|
return
|
||
|
|
|
||
|
|
if id notin self.cache:
|
||
|
|
return
|
||
|
|
|
||
|
|
var
|
||
|
|
providers = self.cache.get(id).get()
|
||
|
|
|
||
|
|
trace "Removing provider from cache", id
|
||
|
|
providers.del(peerId)
|
||
|
|
self.cache.put(id, providers)
|
||
|
|
|
||
|
|
func drop*(self: var ProvidersCache, id: NodeId) =
|
||
|
|
if self.disable:
|
||
|
|
return
|
||
|
|
|
||
|
|
self.cache.del(id)
|
||
|
|
|
||
|
|
func init*(
|
||
|
|
T: type ProvidersCache,
|
||
|
|
size = MaxProvidersEntries,
|
||
|
|
maxProviders = MaxProvidersEntries,
|
||
|
|
disable = false): T =
|
||
|
|
|
||
|
|
T(
|
||
|
|
cache: ItemsCache.init(size.int),
|
||
|
|
maxProviders: maxProviders.int,
|
||
|
|
disable: disable)
|