94 lines
2.3 KiB
Nim
94 lines
2.3 KiB
Nim
## Nim-Codex
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## Copyright (c) 2022 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 pkg/chronos
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import pkg/chronicles
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import pkg/libp2p
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import pkg/questionable
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import pkg/questionable/results
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import pkg/stew/shims/net
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import pkg/libp2pdht/discv5/protocol as discv5
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import ./rng
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import ./errors
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export discv5
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type
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Discovery* = ref object of RootObj
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protocol: discv5.Protocol
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localInfo: PeerInfo
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proc new*(
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T: type Discovery,
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localInfo: PeerInfo,
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discoveryPort = 0.Port,
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bootstrapNodes: seq[SignedPeerRecord] = @[],
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): T =
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T(
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protocol: newProtocol(
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localInfo.privateKey,
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bindPort = discoveryPort,
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record = localInfo.signedPeerRecord,
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bootstrapRecords = bootstrapNodes,
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rng = Rng.instance()
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),
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localInfo: localInfo)
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proc findPeer*(
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d: Discovery,
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peerId: PeerID): Future[?PeerRecord] {.async.} =
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let node = await d.protocol.resolve(toNodeId(peerId))
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return
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if node.isSome():
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some(node.get().record.data)
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else:
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none(PeerRecord)
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proc toDiscoveryId*(cid: Cid): NodeId =
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## To discovery id
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readUintBE[256](keccak256.digest(cid.data.buffer).data)
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method findBlockProviders*(
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d: Discovery,
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cid: Cid): Future[seq[SignedPeerRecord]] {.async, base.} =
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## Find block providers
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##
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trace "Finding providers for block", cid = $cid
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without providers =?
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(await d.protocol.getProviders(cid.toDiscoveryId())).mapFailure, error:
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trace "Error finding providers for block", cid = $cid, error = error.msg
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return providers
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method provideBlock*(d: Discovery, cid: Cid) {.async, base.} =
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## Provide a bock Cid
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##
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trace "Providing block", cid = $cid
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let
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nodes = await d.protocol.addProvider(
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cid.toDiscoveryId(),
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d.localInfo.signedPeerRecord)
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if nodes.len <= 0:
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trace "Couldn't provide to any nodes!"
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trace "Provided to nodes", nodes = nodes.len
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proc start*(d: Discovery) {.async.} =
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d.protocol.updateRecord(d.localInfo.signedPeerRecord).expect("updating SPR")
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d.protocol.open()
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d.protocol.start()
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proc stop*(d: Discovery) {.async.} =
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await d.protocol.closeWait()
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