mirror of https://github.com/status-im/nim-eth.git
141 lines
3.9 KiB
Nim
141 lines
3.9 KiB
Nim
# nim-eth - Node Discovery Protocol v5
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# Copyright (c) 2020-2023 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [].}
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import
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std/hashes,
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nimcrypto/[keccak], stint, chronos, stew/shims/net, chronicles,
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../../keys, ../../net/utils,
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./enr
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export stint
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type
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NodeId* = UInt256
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Address* = object
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ip*: ValidIpAddress
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port*: Port
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Node* = ref object
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id*: NodeId
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pubkey*: PublicKey
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address*: Option[Address]
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record*: Record
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seen*: bool ## Indicates if there was at least one successful
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## request-response with this node.
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func toNodeId*(pk: PublicKey): NodeId =
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## Convert public key to a node identifier.
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# Keccak256 hash is used as defined in ENR spec for scheme v4:
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# https://github.com/ethereum/devp2p/blob/master/enr.md#v4-identity-scheme
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readUintBE[256](keccak256.digest(pk.toRaw()).data)
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func newNode*(r: Record): Result[Node, cstring] =
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## Create a new `Node` from a `Record`.
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# TODO: Handle IPv6
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let pk = r.get(PublicKey)
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# This check is redundant for a properly created record as the deserialization
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# of a record will fail at `verifySignature` if there is no public key.
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if pk.isNone():
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return err("Could not recover public key from ENR")
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# Also this can not fail for a properly created record as id is checked upon
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# deserialization.
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let tr = ? r.toTypedRecord()
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if tr.ip.isSome() and tr.udp.isSome():
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let a = Address(ip: ipv4(tr.ip.get()), port: Port(tr.udp.get()))
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ok(Node(id: pk.get().toNodeId(), pubkey: pk.get() , record: r,
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address: some(a)))
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else:
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ok(Node(id: pk.get().toNodeId(), pubkey: pk.get(), record: r,
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address: none(Address)))
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func update*(n: Node, pk: PrivateKey, ip: Option[ValidIpAddress],
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tcpPort, udpPort: Option[Port] = none[Port](),
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extraFields: openArray[FieldPair] = []): Result[void, cstring] =
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? n.record.update(pk, ip, tcpPort, udpPort, extraFields)
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if ip.isSome():
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if udpPort.isSome():
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let a = Address(ip: ip.get(), port: udpPort.get())
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n.address = some(a)
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elif n.address.isSome():
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let a = Address(ip: ip.get(), port: n.address.get().port)
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n.address = some(a)
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else:
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n.address = none(Address)
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else:
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n.address = none(Address)
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ok()
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func hash*(n: Node): hashes.Hash = hash(n.pubkey.toRaw)
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func `==`*(a, b: Node): bool =
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(a.isNil and b.isNil) or
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(not a.isNil and not b.isNil and a.pubkey == b.pubkey)
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func hash*(id: NodeId): Hash =
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hash(id.toByteArrayBE)
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proc random*(T: type NodeId, rng: var HmacDrbgContext): T =
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rng.generate(T)
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func `$`*(id: NodeId): string =
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id.toHex()
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func shortLog*(id: NodeId): string =
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## Returns compact string representation of ``id``.
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var sid = $id
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if len(sid) <= 10:
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result = sid
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else:
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result = newStringOfCap(10)
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for i in 0..<2:
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result.add(sid[i])
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result.add("*")
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for i in (len(sid) - 6)..sid.high:
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result.add(sid[i])
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func hash*(a: Address): hashes.Hash =
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let res = a.ip.hash !& a.port.hash
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!$res
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func `$`*(a: Address): string =
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result.add($a.ip)
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result.add(":" & $a.port)
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func shortLog*(n: Node): string =
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if n.isNil:
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"uninitialized"
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elif n.address.isNone():
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shortLog(n.id) & ":unaddressable"
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else:
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shortLog(n.id) & ":" & $n.address.get()
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func shortLog*(nodes: seq[Node]): string =
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result = "["
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var first = true
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for n in nodes:
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if first:
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first = false
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else:
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result.add(", ")
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result.add(shortLog(n))
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result.add("]")
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chronicles.formatIt(NodeId): shortLog(it)
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chronicles.formatIt(Address): $it
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chronicles.formatIt(Node): shortLog(it)
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chronicles.formatIt(seq[Node]): shortLog(it)
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