nwaku/examples/v2/basic2.nim

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## Here's a basic example of how you would start a Waku node, subscribe to
## topics, and publish to them.
import
2020-11-18 11:58:46 +00:00
std/[os,options],
confutils, chronicles, chronos,
stew/shims/net as stewNet,
libp2p/crypto/[crypto,secp],
eth/keys,
json_rpc/[rpcclient, rpcserver],
../../waku/v2/node/[config, wakunode2],
../../waku/common/utils/nat,
../../waku/v2/protocol/waku_message
# Node operations happens asynchronously
proc runBackground() {.async.} =
let
conf = WakuNodeConf.load()
(extIp, extTcpPort, extUdpPort) = setupNat(conf.nat, clientId,
Port(uint16(conf.tcpPort) + conf.portsShift),
# This is actually a UDP port but we're only supplying this value
# To satisfy the API.
Port(uint16(conf.tcpPort) + conf.portsShift))
node = WakuNode.new(conf.nodeKey, conf.listenAddress,
Port(uint16(conf.tcpPort) + conf.portsShift), extIp, extTcpPort)
await node.start()
await node.mountRelay()
# Subscribe to a topic
let topic = cast[Topic]("foobar")
proc handler(topic: Topic, data: seq[byte]) {.async, gcsafe.} =
let message = WakuMessage.init(data).value
let payload = cast[string](message.payload)
info "Hit subscribe handler", topic=topic, payload=payload, contentTopic=message.contentTopic
node.subscribe(topic, handler)
# Publish to a topic
let payload = cast[seq[byte]]("hello world")
let message = WakuMessage(payload: payload, contentTopic: ContentTopic("/waku/2/default-content/proto"))
await node.publish(topic, message)
# TODO Await with try/except here
discard runBackground()
runForever()