83 lines
2.3 KiB
Nim
83 lines
2.3 KiB
Nim
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## Nim-Dagger
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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 std/sequtils
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import std/tables
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import std/algorithm
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import pkg/upraises
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push: {.upraises: [].}
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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 ../protobuf/blockexc
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import ../peercontext
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export peercontext
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logScope:
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topics = "dagger blockexc peerctxstore"
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type
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PeerCtxStore* = ref object of RootObj
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peers*: OrderedTable[PeerID, BlockExcPeerCtx]
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iterator items*(self: PeerCtxStore): BlockExcPeerCtx =
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for p in self.peers.values:
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yield p
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func contains*(self: PeerCtxStore, peerId: PeerID): bool =
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peerId in self.peers
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func add*(self: PeerCtxStore, peer: BlockExcPeerCtx) =
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trace "Adding peer to peer context store", peer = peer.id
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self.peers[peer.id] = peer
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func remove*(self: PeerCtxStore, peerId: PeerID) =
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trace "Removing peer from peer context store", peer = peerId
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self.peers.del(peerId)
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func get*(self: PeerCtxStore, peerId: PeerID): BlockExcPeerCtx =
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trace "Retrieving peer from peer context store", peer = peerId
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self.peers.getOrDefault(peerId, nil)
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func len*(self: PeerCtxStore): int =
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self.peers.len
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func peersHave*(self: PeerCtxStore, cid: Cid): seq[BlockExcPeerCtx] =
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toSeq(self.peers.values).filterIt( it.peerHave.anyIt( it == cid ) )
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func peersWant*(self: PeerCtxStore, cid: Cid): seq[BlockExcPeerCtx] =
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toSeq(self.peers.values).filterIt( it.peerWants.anyIt( it.cid == cid ) )
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func selectCheapest*(self: PeerCtxStore, cid: Cid): seq[BlockExcPeerCtx] =
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var
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peers = self.peersHave(cid)
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func cmp(a, b: BlockExcPeerCtx): int =
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# Can't do (a - b) without cast[int](a - b)
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if a.peerPrices.getOrDefault(cid, 0.u256) ==
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b.peerPrices.getOrDefault(cid, 0.u256):
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0
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elif a.peerPrices.getOrDefault(cid, 0.u256) >
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b.peerPrices.getOrDefault(cid, 0.u256):
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1
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else:
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-1
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peers.sort(cmp)
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trace "Selected cheapest peers", peers = peers.len
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return peers
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proc new*(T: type PeerCtxStore): PeerCtxStore =
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T(peers: initOrderedTable[PeerID, BlockExcPeerCtx]())
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