mirror of https://github.com/waku-org/nwaku.git
50 lines
1.5 KiB
Nim
50 lines
1.5 KiB
Nim
when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import
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chronos,
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chronicles,
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std/[options, sequtils],
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stew/results
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import
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../waku_discv5,
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../waku_relay,
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../waku_core,
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./message_cache
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### Discovery
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type DiscoveryHandler* = proc(): Future[Result[Option[RemotePeerInfo], string]] {.async, closure.}
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proc defaultDiscoveryHandler*(discv5: WakuDiscoveryV5, cap: Capabilities): DiscoveryHandler =
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proc(): Future[Result[Option[RemotePeerInfo], string]] {.async, closure.} =
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#Discv5 is already filtering peers by shards no need to pass a predicate.
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let findPeers = discv5.findRandomPeers()
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if not await findPeers.withTimeout(60.seconds):
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return err("discovery process timed out!")
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var peers = findPeers.read()
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peers.keepItIf(it.supportsCapability(cap))
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if peers.len == 0:
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return ok(none(RemotePeerInfo))
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let remotePeerInfo = peers[0].toRemotePeerInfo().valueOr:
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return err($error)
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return ok(some(remotePeerInfo))
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### Message Cache
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proc messageCacheHandler*(cache: MessageCache[string]): WakuRelayHandler =
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return proc(pubsubTopic: string, msg: WakuMessage): Future[void] {.async, closure.} =
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cache.addMessage(PubSubTopic(pubsubTopic), msg)
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proc autoMessageCacheHandler*(cache: MessageCache[string]): WakuRelayHandler =
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return proc(pubsubTopic: string, msg: WakuMessage): Future[void] {.async, closure.} =
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if cache.isSubscribed(msg.contentTopic):
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cache.addMessage(msg.contentTopic, msg) |