171 lines
4.8 KiB
Nim
171 lines
4.8 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2021 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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{.push raises: [Defect].}
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import
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std/[tables, sets, sequtils],
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./crypto/crypto,
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./peerid,
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./multiaddress
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type
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#################
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# Handler types #
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#################
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PeerBookChangeHandler*[T] = proc(peerId: PeerID, entry: T)
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AddrChangeHandler* = PeerBookChangeHandler[HashSet[MultiAddress]]
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ProtoChangeHandler* = PeerBookChangeHandler[HashSet[string]]
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KeyChangeHandler* = PeerBookChangeHandler[PublicKey]
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#########
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# Books #
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#########
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# Each book contains a book (map) and event handler(s)
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PeerBook*[T] = object of RootObj
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book*: Table[PeerID, T]
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changeHandlers: seq[PeerBookChangeHandler[T]]
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AddressBook* = object of PeerBook[HashSet[MultiAddress]]
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ProtoBook* = object of PeerBook[HashSet[string]]
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KeyBook* = object of PeerBook[PublicKey]
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####################
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# Peer store types #
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####################
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PeerStore* = ref object of RootObj
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addressBook*: AddressBook
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protoBook*: ProtoBook
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keyBook*: KeyBook
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StoredInfo* = object
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# Collates stored info about a peer
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peerId*: PeerID
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addrs*: HashSet[MultiAddress]
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protos*: HashSet[string]
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publicKey*: PublicKey
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## Constructs a new PeerStore with metadata of type M
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proc new*(T: type PeerStore): PeerStore =
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var p: PeerStore
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new(p)
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return p
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#########################
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# Generic Peer Book API #
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#########################
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proc get*[T](peerBook: PeerBook[T],
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peerId: PeerID): T =
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## Get all the known metadata of a provided peer.
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peerBook.book.getOrDefault(peerId)
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proc set*[T](peerBook: var PeerBook[T],
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peerId: PeerID,
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entry: T) =
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## Set metadata for a given peerId. This will replace any
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## previously stored metadata.
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peerBook.book[peerId] = entry
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# Notify clients
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for handler in peerBook.changeHandlers:
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handler(peerId, peerBook.get(peerId))
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proc delete*[T](peerBook: var PeerBook[T],
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peerId: PeerID): bool =
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## Delete the provided peer from the book.
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if not peerBook.book.hasKey(peerId):
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return false
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else:
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peerBook.book.del(peerId)
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return true
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####################
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# Address Book API #
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####################
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proc add*(addressBook: var AddressBook,
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peerId: PeerID,
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multiaddr: MultiAddress) =
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## Add known multiaddr of a given peer. If the peer is not known,
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## it will be set with the provided multiaddr.
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addressBook.book.mgetOrPut(peerId,
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initHashSet[MultiAddress]()).incl(multiaddr)
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# Notify clients
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for handler in addressBook.changeHandlers:
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handler(peerId, addressBook.get(peerId))
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#####################
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# Protocol Book API #
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#####################
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proc add*(protoBook: var ProtoBook,
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peerId: PeerID,
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protocol: string) =
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## Adds known protocol codec for a given peer. If the peer is not known,
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## it will be set with the provided protocol.
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protoBook.book.mgetOrPut(peerId,
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initHashSet[string]()).incl(protocol)
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# Notify clients
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for handler in protoBook.changeHandlers:
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handler(peerId, protoBook.get(peerId))
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##################
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# Peer Store API #
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##################
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proc addHandlers*(peerStore: PeerStore,
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addrChangeHandler: AddrChangeHandler,
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protoChangeHandler: ProtoChangeHandler,
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keyChangeHandler: KeyChangeHandler) =
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## Register event handlers to notify clients of changes in the peer store
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peerStore.addressBook.changeHandlers.add(addrChangeHandler)
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peerStore.protoBook.changeHandlers.add(protoChangeHandler)
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peerStore.keyBook.changeHandlers.add(keyChangeHandler)
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proc delete*(peerStore: PeerStore,
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peerId: PeerID): bool =
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## Delete the provided peer from every book.
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peerStore.addressBook.delete(peerId) and
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peerStore.protoBook.delete(peerId) and
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peerStore.keyBook.delete(peerId)
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proc get*(peerStore: PeerStore,
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peerId: PeerID): StoredInfo =
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## Get the stored information of a given peer.
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StoredInfo(
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peerId: peerId,
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addrs: peerStore.addressBook.get(peerId),
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protos: peerStore.protoBook.get(peerId),
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publicKey: peerStore.keyBook.get(peerId)
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)
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proc peers*(peerStore: PeerStore): seq[StoredInfo] =
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## Get all the stored information of every peer.
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let allKeys = concat(toSeq(keys(peerStore.addressBook.book)),
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toSeq(keys(peerStore.protoBook.book)),
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toSeq(keys(peerStore.keyBook.book))).toHashSet()
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return allKeys.mapIt(peerStore.get(it))
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