nim-codex/codex/discovery.nim

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2022-05-19 19:56:03 +00:00
## Nim-Codex
## Copyright (c) 2022 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import std/algorithm
import pkg/chronos
import pkg/chronicles
import pkg/libp2p/[cid, multicodec, routing_record, signed_envelope]
import pkg/questionable
import pkg/questionable/results
import pkg/stew/shims/net
import pkg/contractabi/address as ca
import pkg/codexdht/discv5/protocol as discv5
import ./rng
import ./errors
import ./formats
export discv5
# TODO: If generics in methods had not been
# deprecated, this could have been implemented
# much more elegantly.
logScope:
topics = "codex discovery"
type
Discovery* = ref object of RootObj
protocol*: discv5.Protocol # dht protocol
key: PrivateKey # private key
peerId: PeerId # the peer id of the local node
announceAddrs: seq[MultiAddress] # addresses announced as part of the provider records
providerRecord*: ?SignedPeerRecord # record to advertice node connection information, this carry any
# address that the node can be connected on
dhtRecord*: ?SignedPeerRecord # record to advertice DHT connection information
proc toNodeId*(cid: Cid): NodeId =
## Cid to discovery id
##
readUintBE[256](keccak256.digest(cid.data.buffer).data)
proc toNodeId*(host: ca.Address): NodeId =
## Eth address to discovery id
##
readUintBE[256](keccak256.digest(host.toArray).data)
proc findPeer*(
d: Discovery,
peerId: PeerId
): Future[?PeerRecord] {.async.} =
trace "protocol.resolve..."
## Find peer using the given Discovery object
##
let
node = await d.protocol.resolve(toNodeId(peerId))
return
if node.isSome():
node.get().record.data.some
else:
PeerRecord.none
method find*(
d: Discovery,
cid: Cid
): Future[seq[SignedPeerRecord]] {.async, base.} =
## Find block providers
##
trace "Finding providers for block", cid
without providers =?
(await d.protocol.getProviders(cid.toNodeId())).mapFailure, error:
trace "Error finding providers for block", cid, error = error.msg
return providers
method provide*(d: Discovery, cid: Cid) {.async, base.} =
## Provide a bock Cid
##
trace "Providing block", cid
let
nodes = await d.protocol.addProvider(
cid.toNodeId(), d.providerRecord.get)
if nodes.len <= 0:
trace "Couldn't provide to any nodes!"
trace "Provided to nodes", nodes = nodes.len
method find*(
d: Discovery,
host: ca.Address
): Future[seq[SignedPeerRecord]] {.async, base.} =
## Find host providers
##
trace "Finding providers for host", host = $host
without var providers =?
(await d.protocol.getProviders(host.toNodeId())).mapFailure, error:
trace "Error finding providers for host", host = $host, exc = error.msg
return
if providers.len <= 0:
trace "No providers found", host = $host
return
providers.sort do(a, b: SignedPeerRecord) -> int:
system.cmp[uint64](a.data.seqNo, b.data.seqNo)
return providers
method provide*(d: Discovery, host: ca.Address) {.async, base.} =
## Provide hosts
##
trace "Providing host", host = $host
let
nodes = await d.protocol.addProvider(
host.toNodeId(), d.providerRecord.get)
if nodes.len > 0:
trace "Provided to nodes", nodes = nodes.len
method removeProvider*(
d: Discovery,
peerId: PeerId
): Future[void] {.base.} =
## Remove provider from providers table
##
trace "Removing provider", peerId
d.protocol.removeProvidersLocal(peerId)
proc updateAnnounceRecord*(d: Discovery, addrs: openArray[MultiAddress]) =
## Update providers record
##
d.announceAddrs = @addrs
trace "Updating announce record", addrs = d.announceAddrs
d.providerRecord = SignedPeerRecord.init(
d.key, PeerRecord.init(d.peerId, d.announceAddrs))
.expect("Should construct signed record").some
if not d.protocol.isNil:
d.protocol.updateRecord(d.providerRecord)
.expect("Should update SPR")
proc updateDhtRecord*(d: Discovery, ip: ValidIpAddress, port: Port) =
## Update providers record
##
trace "Updating Dht record", ip, port = $port
d.dhtRecord = SignedPeerRecord.init(
d.key, PeerRecord.init(d.peerId, @[
MultiAddress.init(
ip,
IpTransportProtocol.udpProtocol,
port)])).expect("Should construct signed record").some
if not d.protocol.isNil:
d.protocol.updateRecord(d.dhtRecord)
.expect("Should update SPR")
proc start*(d: Discovery) {.async.} =
d.protocol.open()
await d.protocol.start()
proc stop*(d: Discovery) {.async.} =
await d.protocol.closeWait()
proc new*(
T: type Discovery,
key: PrivateKey,
bindIp = ValidIpAddress.init(IPv4_any()),
bindPort = 0.Port,
announceAddrs: openArray[MultiAddress],
bootstrapNodes: openArray[SignedPeerRecord] = [],
store: Datastore = SQLiteDatastore.new(Memory).expect("Should not fail!")
): Discovery =
## Create a new Discovery node instance for the given key and datastore
##
var
self = Discovery(
key: key,
peerId: PeerId.init(key).expect("Should construct PeerId"))
self.updateAnnounceRecord(announceAddrs)
self.protocol = newProtocol(
key,
bindIp = bindIp.toNormalIp,
bindPort = bindPort,
record = self.providerRecord.get,
bootstrapRecords = bootstrapNodes,
rng = Rng.instance(),
providers = ProvidersManager.new(store))
self