nwaku/examples/publisher.nim

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Nim
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import
std/[tables,times,sequtils],
stew/byteutils,
stew/shims/net,
chronicles,
chronos,
confutils,
libp2p/crypto/crypto,
eth/keys,
eth/p2p/discoveryv5/enr
import
../../../waku/common/logging,
../../../waku/node/peer_manager,
../../../waku/waku_core,
../../../waku/waku_node,
../../../waku/waku_enr,
../../../waku/waku_discv5
proc now*(): Timestamp =
getNanosecondTime(getTime().toUnixFloat())
# An accesible bootstrap node. See wakuv2.prod fleets.status.im
const bootstrapNode = "enr:-Nm4QOdTOKZJKTUUZ4O_W932CXIET-M9NamewDnL78P5u9D" &
"OGnZlK0JFZ4k0inkfe6iY-0JAaJVovZXc575VV3njeiABgmlkgn" &
"Y0gmlwhAjS3ueKbXVsdGlhZGRyc7g6ADg2MW5vZGUtMDEuYWMtY" &
"24taG9uZ2tvbmctYy53YWt1djIucHJvZC5zdGF0dXNpbS5uZXQG" &
"H0DeA4lzZWNwMjU2azGhAo0C-VvfgHiXrxZi3umDiooXMGY9FvY" &
"j5_d1Q4EeS7eyg3RjcIJ2X4N1ZHCCIyiFd2FrdTIP"
# careful if running pub and sub in the same machine
const wakuPort = 60000
const discv5Port = 9000
proc setupAndPublish(rng: ref HmacDrbgContext) {.async.} =
# use notice to filter all waku messaging
setupLogLevel(logging.LogLevel.NOTICE)
notice "starting publisher", wakuPort=wakuPort, discv5Port=discv5Port
let
nodeKey = crypto.PrivateKey.random(Secp256k1, rng[]).get()
ip = parseIpAddress("0.0.0.0")
flags = CapabilitiesBitfield.init(lightpush = false, filter = false, store = false, relay = true)
var enrBuilder = EnrBuilder.init(nodeKey)
let recordRes = enrBuilder.build()
let record =
if recordRes.isErr():
error "failed to create enr record", error=recordRes.error
quit(QuitFailure)
else: recordRes.get()
var builder = WakuNodeBuilder.init()
builder.withNodeKey(nodeKey)
builder.withRecord(record)
builder.withNetworkConfigurationDetails(ip, Port(wakuPort)).tryGet()
let node = builder.build().tryGet()
var bootstrapNodeEnr: enr.Record
discard bootstrapNodeEnr.fromURI(bootstrapNode)
let discv5Conf = WakuDiscoveryV5Config(
discv5Config: none(DiscoveryConfig),
address: ip,
port: Port(discv5Port),
privateKey: keys.PrivateKey(nodeKey.skkey),
bootstrapRecords: @[bootstrapNodeEnr],
autoupdateRecord: true,
)
# assumes behind a firewall, so not care about being discoverable
let wakuDiscv5 = WakuDiscoveryV5.new(
node.rng,
discv5Conf,
some(node.enr),
some(node.peerManager),
node.topicSubscriptionQueue,
)
await node.start()
await node.mountRelay()
node.peerManager.start()
(await wakuDiscv5.start()).isOkOr:
error "failed to start discv5", error = error
quit(1)
# wait for a minimum of peers to be connected, otherwise messages wont be gossiped
while true:
let numConnectedPeers = node.peerManager.peerStore[ConnectionBook].book.values().countIt(it == Connected)
if numConnectedPeers >= 6:
notice "publisher is ready", connectedPeers=numConnectedPeers, required=6
break
notice "waiting to be ready", connectedPeers=numConnectedPeers, required=6
await sleepAsync(5000)
# Make sure it matches the publisher. Use default value
# see spec: https://rfc.vac.dev/spec/23/
let pubSubTopic = PubsubTopic("/waku/2/default-waku/proto")
# any content topic can be chosen
let contentTopic = ContentTopic("/examples/1/pubsub-example/proto")
notice "publisher service started"
while true:
let text = "hi there i'm a publisher"
let message = WakuMessage(payload: toBytes(text), # content of the message
contentTopic: contentTopic, # content topic to publish to
ephemeral: true, # tell store nodes to not store it
timestamp: now()) # current timestamp
let res = await node.publish(some(pubSubTopic), message)
if res.isOk:
notice "published message", text = text, timestamp = message.timestamp, psTopic = pubSubTopic, contentTopic = contentTopic
else:
error "failed to publish message", error = res.error
await sleepAsync(5000)
when isMainModule:
let rng = crypto.newRng()
asyncSpawn setupAndPublish(rng)
runForever()