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nwaku/apps/chat2/chat2.nim

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## chat2 is an example of usage of Waku v2. For suggested usage options, please
## see dingpu tutorial in docs folder.
when not(compileOption("threads")):
{.fatal: "Please, compile this program with the --threads:on option!".}
when (NimMajor, NimMinor) < (1, 4):
{.push raises: [Defect].}
else:
{.push raises: [].}
import std/[strformat, strutils, times, json, options, random]
import confutils, chronicles, chronos, stew/shims/net as stewNet,
eth/keys, bearssl, stew/[byteutils, results],
nimcrypto/pbkdf2
import libp2p/[switch, # manage transports, a single entry point for dialing and listening
crypto/crypto, # cryptographic functions
stream/connection, # create and close stream read / write connections
multiaddress, # encode different addressing schemes. For example, /ip4/7.7.7.7/tcp/6543 means it is using IPv4 protocol and TCP
peerinfo, # manage the information of a peer, such as peer ID and public / private key
peerid, # Implement how peers interact
protobuf/minprotobuf, # message serialisation/deserialisation from and to protobufs
protocols/secure/secio, # define the protocol of secure input / output, allows encrypted communication that uses public keys to validate signed messages instead of a certificate authority like in TLS
nameresolving/dnsresolver]# define DNS resolution
import
../../waku/v2/protocol/waku_message,
../../waku/v2/protocol/waku_lightpush,
../../waku/v2/protocol/waku_lightpush/rpc,
../../waku/v2/protocol/waku_filter,
../../waku/v2/protocol/waku_store,
../../waku/v2/protocol/waku_dnsdisc,
../../waku/v2/waku_node,
../../waku/v2/node/waku_metrics,
../../waku/v2/node/peer_manager,
../../waku/v2/utils/compat,
../../waku/v2/utils/peers,
../../waku/v2/utils/time,
../../waku/common/utils/nat,
./config_chat2
when defined(rln):
import
libp2p/protocols/pubsub/rpc/messages,
libp2p/protocols/pubsub/pubsub
import
../../waku/v2/protocol/waku_rln_relay
const Help = """
Commands: /[?|help|connect|nick|exit]
help: Prints this help
connect: dials a remote peer
nick: change nickname for current chat session
exit: exits chat session
"""
const
PayloadV1* {.booldefine.} = false
# XXX Connected is a bit annoying, because incoming connections don't trigger state change
# Could poll connection pool or something here, I suppose
# TODO Ensure connected turns true on incoming connections, or get rid of it
type Chat = ref object
node: WakuNode # waku node for publishing, subscribing, etc
transp: StreamTransport # transport streams between read & write file descriptor
subscribed: bool # indicates if a node is subscribed or not to a topic
connected: bool # if the node is connected to another peer
started: bool # if the node has started
nick: string # nickname for this chat session
prompt: bool # chat prompt is showing
contentTopic: string # default content topic for chat messages
symkey: SymKey # SymKey used for v1 payload encryption (if enabled)
type
PrivateKey* = crypto.PrivateKey
Topic* = waku_message.PubsubTopic
#####################
## chat2 protobufs ##
#####################
type
SelectResult*[T] = Result[T, string]
Chat2Message* = object
timestamp*: int64
nick*: string
payload*: seq[byte]
proc init*(T: type Chat2Message, buffer: seq[byte]): ProtoResult[T] =
var msg = Chat2Message()
let pb = initProtoBuffer(buffer)
var timestamp: uint64
discard ? pb.getField(1, timestamp)
msg.timestamp = int64(timestamp)
discard ? pb.getField(2, msg.nick)
discard ? pb.getField(3, msg.payload)
ok(msg)
proc encode*(message: Chat2Message): ProtoBuffer =
var serialised = initProtoBuffer()
serialised.write(1, uint64(message.timestamp))
serialised.write(2, message.nick)
serialised.write(3, message.payload)
return serialised
proc toString*(message: Chat2Message): string =
# Get message date and timestamp in local time
let time = message.timestamp.fromUnix().local().format("'<'MMM' 'dd,' 'HH:mm'>'")
return time & " " & message.nick & ": " & string.fromBytes(message.payload)
#####################
# Similarly as Status public chats now.
proc generateSymKey(contentTopic: ContentTopic): SymKey =
var ctx: HMAC[pbkdf2.sha256]
var symKey: SymKey
if pbkdf2(ctx, contentTopic.toBytes(), "", 65356, symKey) != sizeof(SymKey):
raise (ref Defect)(msg: "Should not occur as array is properly sized")
symKey
proc connectToNodes(c: Chat, nodes: seq[string]) {.async.} =
echo "Connecting to nodes"
await c.node.connectToNodes(nodes)
c.connected = true
proc showChatPrompt(c: Chat) =
if not c.prompt:
try:
stdout.write(">> ")
stdout.flushFile()
c.prompt = true
except IOError:
discard
proc getChatLine(c: Chat, msg:WakuMessage): Result[string, string]=
when PayloadV1:
# Use Waku v1 payload encoding/encryption
let
keyInfo = KeyInfo(kind: Symmetric, symKey: c.symKey)
decodedPayload = decodePayload(decoded.get(), keyInfo)
if decodedPayload.isOK():
let
pb = Chat2Message.init(decodedPayload.get().payload)
chatLine = if pb.isOk: pb[].toString()
else: string.fromBytes(decodedPayload.get().payload)
return ok(chatLine)
else:
debug "Invalid encoded WakuMessage payload",
error = decodedPayload.error
return err("Invalid encoded WakuMessage payload")
else:
# No payload encoding/encryption from Waku
let
pb = Chat2Message.init(msg.payload)
chatLine = if pb.isOk: pb[].toString()
else: string.fromBytes(msg.payload)
return ok(chatline)
proc printReceivedMessage(c: Chat, msg: WakuMessage) =
when PayloadV1:
# Use Waku v1 payload encoding/encryption
let
keyInfo = KeyInfo(kind: Symmetric, symKey: c.symKey)
decodedPayload = decodePayload(decoded.get(), keyInfo)
if decodedPayload.isOK():
let
pb = Chat2Message.init(decodedPayload.get().payload)
chatLine = if pb.isOk: pb[].toString()
else: string.fromBytes(decodedPayload.get().payload)
echo &"{chatLine}"
c.prompt = false
showChatPrompt(c)
trace "Printing message", topic=DefaultPubsubTopic, chatLine,
contentTopic = msg.contentTopic
else:
debug "Invalid encoded WakuMessage payload",
error = decodedPayload.error
else:
# No payload encoding/encryption from Waku
let
pb = Chat2Message.init(msg.payload)
chatLine = if pb.isOk: pb[].toString()
else: string.fromBytes(msg.payload)
try:
echo &"{chatLine}"
except ValueError:
# Formatting fail. Print chat line in any case.
echo chatLine
c.prompt = false
showChatPrompt(c)
trace "Printing message", topic=DefaultPubsubTopic, chatLine,
contentTopic = msg.contentTopic
proc readNick(transp: StreamTransport): Future[string] {.async.} =
# Chat prompt
stdout.write("Choose a nickname >> ")
stdout.flushFile()
return await transp.readLine()
proc publish(c: Chat, line: string) =
# First create a Chat2Message protobuf with this line of text
let time = getTime().toUnix()
let chat2pb = Chat2Message(timestamp: time,
nick: c.nick,
payload: line.toBytes()).encode()
## @TODO: error handling on failure
proc handler(response: PushResponse) {.gcsafe, closure.} =
trace "lightpush response received", response=response
when PayloadV1:
# Use Waku v1 payload encoding/encryption
let
rng = keys.newRng()
payload = Payload(payload: chat2pb.buffer, symKey: some(c.symKey))
version = 1'u32
encodedPayload = payload.encode(version, rng[])
if encodedPayload.isOk():
var message = WakuMessage(payload: encodedPayload.get(),
contentTopic: c.contentTopic, version: version, timestamp: getNanosecondTime(time))
when defined(rln):
if not isNil(c.node.wakuRlnRelay):
# for future version when we support more than one rln protected content topic,
# we should check the message content topic as well
let success = c.node.wakuRlnRelay.appendRLNProof(message, float64(time))
if not success:
debug "could not append rate limit proof to the message", success=success
else:
debug "rate limit proof is appended to the message", success=success
let decodeRes = RateLimitProof.init(message.proof)
if decodeRes.isErr():
error "could not decode RLN proof"
let proof = decodeRes.get()
# TODO move it to log after dogfooding
let msgEpoch = fromEpoch(proof.epoch)
if fromEpoch(c.node.wakuRlnRelay.lastEpoch) == fromEpoch(proof.epoch):
echo "--rln epoch: ", msgEpoch, " ⚠️ message rate violation! you are spamming the network!"
else:
echo "--rln epoch: ", msgEpoch
# update the last epoch
c.node.wakuRlnRelay.lastEpoch = proof.epoch
if not c.node.wakuLightPush.isNil():
# Attempt lightpush
asyncSpawn c.node.lightpushPublish(DefaultPubsubTopic, message)
else:
asyncSpawn c.node.publish(DefaultPubsubTopic, message, handler)
else:
warn "Payload encoding failed", error = encodedPayload.error
else:
# No payload encoding/encryption from Waku
var message = WakuMessage(payload: chat2pb.buffer,
contentTopic: c.contentTopic, version: 0, timestamp: getNanosecondTime(time))
when defined(rln):
if not isNil(c.node.wakuRlnRelay):
# for future version when we support more than one rln protected content topic,
# we should check the message content topic as well
let success = c.node.wakuRlnRelay.appendRLNProof(message, float64(time))
if not success:
debug "could not append rate limit proof to the message", success=success
else:
debug "rate limit proof is appended to the message", success=success
let decodeRes = RateLimitProof.init(message.proof)
if decodeRes.isErr():
error "could not decode the RLN proof"
let proof = decodeRes.get()
# TODO move it to log after dogfooding
let msgEpoch = fromEpoch(proof.epoch)
if fromEpoch(c.node.wakuRlnRelay.lastEpoch) == msgEpoch:
echo "--rln epoch: ", msgEpoch, " ⚠️ message rate violation! you are spamming the network!"
else:
echo "--rln epoch: ", msgEpoch
# update the last epoch
c.node.wakuRlnRelay.lastEpoch = proof.epoch
if not c.node.wakuLightPush.isNil():
# Attempt lightpush
asyncSpawn c.node.lightpushPublish(DefaultPubsubTopic, message)
else:
asyncSpawn c.node.publish(DefaultPubsubTopic, message)
# TODO This should read or be subscribe handler subscribe
proc readAndPrint(c: Chat) {.async.} =
while true:
# while p.connected:
# # TODO: echo &"{p.id} -> "
#
# echo cast[string](await p.conn.readLp(1024))
#echo "readAndPrint subscribe NYI"
await sleepAsync(100.millis)
# TODO Implement
proc writeAndPrint(c: Chat) {.async.} =
while true:
# Connect state not updated on incoming WakuRelay connections
# if not c.connected:
# echo "type an address or wait for a connection:"
# echo "type /[help|?] for help"
# Chat prompt
showChatPrompt(c)
let line = await c.transp.readLine()
if line.startsWith("/help") or line.startsWith("/?") or not c.started:
echo Help
continue
# if line.startsWith("/disconnect"):
# echo "Ending current session"
# if p.connected and p.conn.closed.not:
# await p.conn.close()
# p.connected = false
elif line.startsWith("/connect"):
# TODO Should be able to connect to multiple peers for Waku chat
if c.connected:
echo "already connected to at least one peer"
continue
echo "enter address of remote peer"
let address = await c.transp.readLine()
if address.len > 0:
await c.connectToNodes(@[address])
elif line.startsWith("/nick"):
# Set a new nickname
c.nick = await readNick(c.transp)
echo "You are now known as " & c.nick
elif line.startsWith("/exit"):
if not c.node.wakuFilter.isNil():
echo "unsubscribing from content filters..."
await c.node.unsubscribe(pubsubTopic=DefaultPubsubTopic, contentTopics=c.contentTopic)
echo "quitting..."
await c.node.stop()
quit(QuitSuccess)
else:
# XXX connected state problematic
if c.started:
c.publish(line)
# TODO Connect to peer logic?
else:
try:
if line.startsWith("/") and "p2p" in line:
await c.connectToNodes(@[line])
except:
echo &"unable to dial remote peer {line}"
echo getCurrentExceptionMsg()
proc readWriteLoop(c: Chat) {.async.} =
asyncSpawn c.writeAndPrint() # execute the async function but does not block
asyncSpawn c.readAndPrint()
proc readInput(wfd: AsyncFD) {.thread, raises: [Defect, CatchableError].} =
## This procedure performs reading from `stdin` and sends data over
## pipe to main thread.
let transp = fromPipe(wfd)
while true:
let line = stdin.readLine()
discard waitFor transp.write(line & "\r\n")
{.pop.} # @TODO confutils.nim(775, 17) Error: can raise an unlisted exception: ref IOError
proc processInput(rfd: AsyncFD, rng: ref HmacDrbgContext) {.async.} =
let
transp = fromPipe(rfd)
conf = Chat2Conf.load()
nodekey = if conf.nodekey.isSome(): conf.nodekey.get()
else: PrivateKey.random(Secp256k1, rng[]).tryGet()
# set log level
if conf.logLevel != LogLevel.NONE:
setLogLevel(conf.logLevel)
let
(extIp, extTcpPort, extUdpPort) = setupNat(conf.nat, clientId,
Port(uint16(conf.tcpPort) + conf.portsShift),
Port(uint16(conf.udpPort) + conf.portsShift))
let node = block:
var builder = WakuNodeBuilder.init()
builder.withNodeKey(nodeKey)
builder.withNetworkConfigurationDetails(conf.listenAddress, Port(uint16(conf.tcpPort) + conf.portsShift),
extIp, extTcpPort,
wsBindPort = Port(uint16(conf.websocketPort) + conf.portsShift),
wsEnabled = conf.websocketSupport,
wssEnabled = conf.websocketSecureSupport).tryGet()
builder.build().tryGet()
await node.start()
if conf.rlnRelayEthAccountPrivateKey == "" and conf.rlnRelayCredPath == "":
raise newException(ConfigurationError,
"Either rln-relay-eth-account-private-key or rln-relay-cred-path MUST be passed")
if conf.relay:
await node.mountRelay(conf.topics.split(" "))
await node.mountLibp2pPing()
let nick = await readNick(transp)
echo "Welcome, " & nick & "!"
var chat = Chat(node: node,
transp: transp,
subscribed: true,
connected: false,
started: true,
nick: nick,
prompt: false,
contentTopic: conf.contentTopic,
symKey: generateSymKey(conf.contentTopic))
if conf.staticnodes.len > 0:
echo "Connecting to static peers..."
await connectToNodes(chat, conf.staticnodes)
var dnsDiscoveryUrl = none(string)
if conf.fleet != Fleet.none:
# Use DNS discovery to connect to selected fleet
echo "Connecting to " & $conf.fleet & " fleet using DNS discovery..."
if conf.fleet == Fleet.test:
dnsDiscoveryUrl = some("enrtree://AOGECG2SPND25EEFMAJ5WF3KSGJNSGV356DSTL2YVLLZWIV6SAYBM@test.waku.nodes.status.im")
else:
# Connect to prod by default
dnsDiscoveryUrl = some("enrtree://AOGECG2SPND25EEFMAJ5WF3KSGJNSGV356DSTL2YVLLZWIV6SAYBM@prod.waku.nodes.status.im")
elif conf.dnsDiscovery and conf.dnsDiscoveryUrl != "":
# No pre-selected fleet. Discover nodes via DNS using user config
debug "Discovering nodes using Waku DNS discovery", url=conf.dnsDiscoveryUrl
dnsDiscoveryUrl = some(conf.dnsDiscoveryUrl)
var discoveredNodes: seq[RemotePeerInfo]
if dnsDiscoveryUrl.isSome:
var nameServers: seq[TransportAddress]
for ip in conf.dnsDiscoveryNameServers:
nameServers.add(initTAddress(ip, Port(53))) # Assume all servers use port 53
let dnsResolver = DnsResolver.new(nameServers)
proc resolver(domain: string): Future[string] {.async, gcsafe.} =
trace "resolving", domain=domain
let resolved = await dnsResolver.resolveTxt(domain)
return resolved[0] # Use only first answer
var wakuDnsDiscovery = WakuDnsDiscovery.init(dnsDiscoveryUrl.get(),
resolver)
if wakuDnsDiscovery.isOk:
let discoveredPeers = wakuDnsDiscovery.get().findPeers()
if discoveredPeers.isOk:
info "Connecting to discovered peers"
discoveredNodes = discoveredPeers.get()
echo "Discovered and connecting to " & $discoveredNodes
waitFor chat.node.connectToNodes(discoveredNodes)
else:
warn "Failed to init Waku DNS discovery"
let peerInfo = node.switch.peerInfo
let listenStr = $peerInfo.addrs[0] & "/p2p/" & $peerInfo.peerId
echo &"Listening on\n {listenStr}"
if (conf.storenode != "") or (conf.store == true):
await node.mountStore()
var storenode: Option[RemotePeerInfo]
if conf.storenode != "":
let peerInfo = parsePeerInfo(conf.storenode)
if peerInfo.isOk():
storenode = some(peerInfo.value)
else:
error "Incorrect conf.storenode", error = peerInfo.error
elif discoveredNodes.len > 0:
echo "Store enabled, but no store nodes configured. Choosing one at random from discovered peers"
storenode = some(discoveredNodes[rand(0..len(discoveredNodes) - 1)])
if storenode.isSome():
# We have a viable storenode. Let's query it for historical messages.
echo "Connecting to storenode: " & $(storenode.get())
node.mountStoreClient()
node.peerManager.addServicePeer(storenode.get(), WakuStoreCodec)
proc storeHandler(response: HistoryResponse) {.gcsafe.} =
for msg in response.messages:
let
pb = Chat2Message.init(msg.payload)
chatLine = if pb.isOk: pb[].toString()
else: string.fromBytes(msg.payload)
echo &"{chatLine}"
info "Hit store handler"
let queryRes = await node.query(HistoryQuery(contentTopics: @[chat.contentTopic]))
if queryRes.isOk():
storeHandler(queryRes.value)
# NOTE Must be mounted after relay
if conf.lightpushnode != "":
let peerInfo = parsePeerInfo(conf.lightpushnode)
if peerInfo.isOk():
await mountLightPush(node)
node.mountLightPushClient()
node.peerManager.addServicePeer(peerInfo.value, WakuLightpushCodec)
else:
error "LightPush not mounted. Couldn't parse conf.lightpushnode",
error = peerInfo.error
if conf.filternode != "":
let peerInfo = parsePeerInfo(conf.filternode)
if peerInfo.isOk():
await node.mountFilter()
await node.mountFilterClient()
node.peerManager.addServicePeer(peerInfo.value, WakuFilterCodec)
proc filterHandler(pubsubTopic: PubsubTopic, msg: WakuMessage) {.gcsafe.} =
trace "Hit filter handler", contentTopic=msg.contentTopic
chat.printReceivedMessage(msg)
await node.subscribe(pubsubTopic=DefaultPubsubTopic, contentTopics=chat.contentTopic, filterHandler)
else:
error "Filter not mounted. Couldn't parse conf.filternode",
error = peerInfo.error
# Subscribe to a topic, if relay is mounted
if conf.relay:
proc handler(topic: Topic, data: seq[byte]) {.async, gcsafe.} =
trace "Hit subscribe handler", topic
let decoded = WakuMessage.decode(data)
if decoded.isOk():
if decoded.get().contentTopic == chat.contentTopic:
chat.printReceivedMessage(decoded.get())
else:
trace "Invalid encoded WakuMessage", error = decoded.error
let topic = DefaultPubsubTopic
node.subscribe(topic, handler)
when defined(rln):
if conf.rlnRelay:
info "WakuRLNRelay is enabled"
proc spamHandler(wakuMessage: WakuMessage) {.gcsafe, closure.} =
debug "spam handler is called"
let chatLineResult = chat.getChatLine(wakuMessage)
if chatLineResult.isOk():
echo "A spam message is found and discarded : ", chatLineResult.value
else:
echo "A spam message is found and discarded"
chat.prompt = false
showChatPrompt(chat)
proc registrationHandler(txHash: string) {.gcsafe, closure.} =
echo "You are registered to the rln membership contract, find details of your registration transaction in https://goerli.etherscan.io/tx/0x", txHash
echo "rln-relay preparation is in progress..."
let rlnConf = WakuRlnConfig(
rlnRelayDynamic: conf.rlnRelayDynamic,
rlnRelayPubsubTopic: conf.rlnRelayPubsubTopic,
rlnRelayContentTopic: conf.rlnRelayContentTopic,
rlnRelayMembershipIndex: some(conf.rlnRelayMembershipIndex),
rlnRelayEthContractAddress: conf.rlnRelayEthContractAddress,
rlnRelayEthClientAddress: conf.rlnRelayEthClientAddress,
rlnRelayEthAccountPrivateKey: conf.rlnRelayEthAccountPrivateKey,
rlnRelayEthAccountAddress: conf.rlnRelayEthAccountAddress,
rlnRelayCredPath: conf.rlnRelayCredPath,
rlnRelayCredentialsPassword: conf.rlnRelayCredentialsPassword
)
await node.mountRlnRelay(rlnConf,
spamHandler=some(spamHandler),
registrationHandler=some(registrationHandler))
let membershipIndex = node.wakuRlnRelay.groupManager.membershipIndex.get()
let identityCredential = node.wakuRlnRelay.groupManager.idCredentials.get()
echo "your membership index is: ", membershipIndex
echo "your rln identity trapdoor is: ", identityCredential.idTrapdoor.inHex()
echo "your rln identity nullifier is: ", identityCredential.idNullifier.inHex()
echo "your rln identity secret hash is: ", identityCredential.idSecretHash.inHex()
echo "your rln identity commitment key is: ", identityCredential.idCommitment.inHex()
else:
info "WakuRLNRelay is disabled"
if conf.rlnRelay:
echo "WakuRLNRelay is disabled, please enable it by compiling with the RLN/EXPERIMENTAL flag"
if conf.metricsLogging:
startMetricsLog()
if conf.metricsServer:
startMetricsServer(conf.metricsServerAddress,
Port(conf.metricsServerPort + conf.portsShift))
await chat.readWriteLoop()
if conf.keepAlive:
node.startKeepalive()
runForever()
proc main(rng: ref HmacDrbgContext) {.async.} =
let (rfd, wfd) = createAsyncPipe()
if rfd == asyncInvalidPipe or wfd == asyncInvalidPipe:
raise newException(ValueError, "Could not initialize pipe!")
var thread: Thread[AsyncFD]
thread.createThread(readInput, wfd)
try:
await processInput(rfd, rng)
# Handle only ConfigurationError for now
# TODO: Throw other errors from the mounting procedure
except ConfigurationError as e:
raise e
when isMainModule: # isMainModule = true when the module is compiled as the main file
let rng = crypto.newRng()
try:
waitFor(main(rng))
except CatchableError as e:
raise e
## Dump of things that can be improved:
##
## - Incoming dialed peer does not change connected state (not relying on it for now)
## - Unclear if staticnode argument works (can enter manually)
## - Don't trigger self / double publish own messages
## - Integrate store protocol (fetch messages in beginning)
## - Integrate filter protocol (default/option to be light node, connect to filter node)
## - Test/default to cluster node connection (diff protocol version)
## - Redirect logs to separate file
## - Expose basic publish/subscribe etc commands with /syntax
## - Show part of peerid to know who sent message
## - Deal with protobuf messages (e.g. other chat protocol, or encrypted)
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