nwaku/waku/waku_filter_v2/protocol.nim

287 lines
10 KiB
Nim

## Waku Filter protocol for subscribing and filtering messages
when (NimMajor, NimMinor) < (1, 4):
{.push raises: [Defect].}
else:
{.push raises: [].}
import
std/[options,sequtils,sets,strutils,tables],
stew/byteutils,
chronicles,
chronos,
libp2p/peerid,
libp2p/protocols/protocol
import
../node/peer_manager,
../waku_core,
./common,
./protocol_metrics,
./rpc_codec,
./rpc,
./subscriptions
logScope:
topics = "waku filter"
const
MaxContentTopicsPerRequest* = 100
type
WakuFilter* = ref object of LPProtocol
subscriptions*: FilterSubscriptions # a mapping of peer ids to a sequence of filter criteria
peerManager: PeerManager
maintenanceTask: TimerCallback
proc pingSubscriber(wf: WakuFilter, peerId: PeerID): FilterSubscribeResult =
trace "pinging subscriber", peerId=peerId
if not wf.subscriptions.isSubscribed(peerId):
debug "pinging peer has no subscriptions", peerId=peerId
return err(FilterSubscribeError.notFound())
wf.subscriptions.refreshSubscription(peerId)
ok()
proc subscribe(wf: WakuFilter,
peerId: PeerID,
pubsubTopic: Option[PubsubTopic],
contentTopics: seq[ContentTopic]): FilterSubscribeResult =
# TODO: check if this condition is valid???
if pubsubTopic.isNone() or contentTopics.len == 0:
return err(FilterSubscribeError.badRequest("pubsubTopic and contentTopics must be specified"))
if contentTopics.len > MaxContentTopicsPerRequest:
return err(FilterSubscribeError.badRequest("exceeds maximum content topics: " &
$MaxContentTopicsPerRequest))
let filterCriteria = toHashSet(contentTopics.mapIt((pubsubTopic.get(), it)))
trace "subscribing peer to filter criteria", peerId=peerId, filterCriteria=filterCriteria
wf.subscriptions.addSubscription(peerId, filterCriteria).isOkOr:
return err(FilterSubscribeError.serviceUnavailable(error))
ok()
proc unsubscribe(wf: WakuFilter,
peerId: PeerID,
pubsubTopic: Option[PubsubTopic],
contentTopics: seq[ContentTopic]): FilterSubscribeResult =
if pubsubTopic.isNone() or contentTopics.len == 0:
return err(FilterSubscribeError.badRequest("pubsubTopic and contentTopics must be specified"))
if contentTopics.len > MaxContentTopicsPerRequest:
return err(FilterSubscribeError.badRequest("exceeds maximum content topics: " & $MaxContentTopicsPerRequest))
let filterCriteria = toHashSet(contentTopics.mapIt((pubsubTopic.get(), it)))
debug "unsubscribing peer from filter criteria", peerId=peerId, filterCriteria=filterCriteria
wf.subscriptions.removeSubscription(peerId, filterCriteria).isOkOr:
return err(FilterSubscribeError.notFound())
ok()
proc unsubscribeAll(wf: WakuFilter, peerId: PeerID): FilterSubscribeResult =
if not wf.subscriptions.isSubscribed(peerId):
debug "unsubscribing peer has no subscriptions", peerId=peerId
return err(FilterSubscribeError.notFound())
debug "removing peer subscription", peerId=peerId
wf.subscriptions.removePeer(peerId)
wf.subscriptions.cleanUp()
ok()
proc handleSubscribeRequest*(wf: WakuFilter,
peerId: PeerId,
request: FilterSubscribeRequest): FilterSubscribeResponse =
info "received filter subscribe request", peerId=peerId, request=request
waku_filter_requests.inc(labelValues = [$request.filterSubscribeType])
var subscribeResult: FilterSubscribeResult
let requestStartTime = Moment.now()
block:
## Handle subscribe request
case request.filterSubscribeType
of FilterSubscribeType.SUBSCRIBER_PING:
subscribeResult = wf.pingSubscriber(peerId)
of FilterSubscribeType.SUBSCRIBE:
subscribeResult = wf.subscribe(peerId, request.pubsubTopic, request.contentTopics)
of FilterSubscribeType.UNSUBSCRIBE:
subscribeResult = wf.unsubscribe(peerId, request.pubsubTopic, request.contentTopics)
of FilterSubscribeType.UNSUBSCRIBE_ALL:
subscribeResult = wf.unsubscribeAll(peerId)
let
requestDuration = Moment.now() - requestStartTime
requestDurationSec = requestDuration.milliseconds.float / 1000 # Duration in seconds with millisecond precision floating point
waku_filter_request_duration_seconds.observe(
requestDurationSec, labelValues = [$request.filterSubscribeType])
if subscribeResult.isErr():
return FilterSubscribeResponse(
requestId: request.requestId,
statusCode: subscribeResult.error.kind.uint32,
statusDesc: some($subscribeResult.error)
)
else:
return FilterSubscribeResponse.ok(request.requestId)
proc pushToPeer(wf: WakuFilter, peer: PeerId, buffer: seq[byte]) {.async.} =
trace "pushing message to subscribed peer", peer=peer
if not wf.peerManager.peerStore.hasPeer(peer, WakuFilterPushCodec):
# Check that peer has not been removed from peer store
trace "no addresses for peer", peer=peer
return
## TODO: Check if dial is necessary always???
let conn = await wf.peerManager.dialPeer(peer, WakuFilterPushCodec)
if conn.isNone():
## We do not remove this peer, but allow the underlying peer manager
## to do so if it is deemed necessary
trace "no connection to peer", peer=peer
return
await conn.get().writeLp(buffer)
proc pushToPeers(wf: WakuFilter, peers: seq[PeerId], messagePush: MessagePush) {.async.} =
debug "pushing message to subscribed peers", pubsubTopic=messagePush.pubsubTopic,
contentTopic=messagePush.wakuMessage.contentTopic,
peers=peers,
hash=messagePush.pubsubTopic.computeMessageHash(messagePush.wakuMessage).to0xHex()
let bufferToPublish = messagePush.encode().buffer
var pushFuts: seq[Future[void]]
for peerId in peers:
let pushFut = wf.pushToPeer(peerId, bufferToPublish)
pushFuts.add(pushFut)
await allFutures(pushFuts)
proc maintainSubscriptions*(wf: WakuFilter) =
trace "maintaining subscriptions"
## Remove subscriptions for peers that have been removed from peer store
var peersToRemove: seq[PeerId]
for peerId in wf.subscriptions.peersSubscribed.keys:
if not wf.peerManager.peerStore.hasPeer(peerId, WakuFilterPushCodec):
debug "peer has been removed from peer store, removing subscription", peerId=peerId
peersToRemove.add(peerId)
if peersToRemove.len > 0:
wf.subscriptions.removePeers(peersToRemove)
wf.subscriptions.cleanUp()
## Periodic report of number of subscriptions
waku_filter_subscriptions.set(wf.subscriptions.peersSubscribed.len.float64)
const MessagePushTimeout = 20.seconds
proc handleMessage*(wf: WakuFilter, pubsubTopic: PubsubTopic, message: WakuMessage) {.async.} =
trace "handling message", pubsubTopic=pubsubTopic, message=message
let handleMessageStartTime = Moment.now()
block:
## Find subscribers and push message to them
let subscribedPeers = wf.subscriptions.findSubscribedPeers(pubsubTopic, message.contentTopic)
if subscribedPeers.len == 0:
trace "no subscribed peers found", pubsubTopic=pubsubTopic, contentTopic=message.contentTopic
return
let messagePush = MessagePush(
pubsubTopic: pubsubTopic,
wakuMessage: message)
if not await wf.pushToPeers(subscribedPeers, messagePush).withTimeout(MessagePushTimeout):
debug "timed out pushing message to peers", pubsubTopic=pubsubTopic,
contentTopic=message.contentTopic,
hash=pubsubTopic.computeMessageHash(message).to0xHex()
waku_filter_errors.inc(labelValues = [pushTimeoutFailure])
else:
debug "pushed message succesfully to all subscribers",
pubsubTopic=pubsubTopic,
contentTopic=message.contentTopic,
hash=pubsubTopic.computeMessageHash(message).to0xHex()
let
handleMessageDuration = Moment.now() - handleMessageStartTime
handleMessageDurationSec = handleMessageDuration.milliseconds.float / 1000 # Duration in seconds with millisecond precision floating point
waku_filter_handle_message_duration_seconds.observe(handleMessageDurationSec)
proc initProtocolHandler(wf: WakuFilter) =
proc handler(conn: Connection, proto: string) {.async.} =
trace "filter subscribe request handler triggered", peerId=conn.peerId
let buf = await conn.readLp(int(MaxSubscribeSize))
let decodeRes = FilterSubscribeRequest.decode(buf)
if decodeRes.isErr():
error "Failed to decode filter subscribe request", peerId=conn.peerId, err=decodeRes.error
waku_filter_errors.inc(labelValues = [decodeRpcFailure])
return
let request = decodeRes.value #TODO: toAPI() split here
let response = wf.handleSubscribeRequest(conn.peerId, request)
debug "sending filter subscribe response", peerId=conn.peerId, response=response
await conn.writeLp(response.encode().buffer) #TODO: toRPC() separation here
return
wf.handler = handler
wf.codec = WakuFilterSubscribeCodec
proc new*(T: type WakuFilter,
peerManager: PeerManager,
subscriptionTimeout: Duration = DefaultSubscriptionTimeToLiveSec,
maxFilterPeers: uint32 = MaxFilterPeers,
maxFilterCriteriaPerPeer: uint32 = MaxFilterCriteriaPerPeer): T =
let wf = WakuFilter(
subscriptions: FilterSubscriptions.init(subscriptionTimeout,
maxFilterPeers,
maxFilterCriteriaPerPeer
),
peerManager: peerManager
)
wf.initProtocolHandler()
return wf
const MaintainSubscriptionsInterval* = 1.minutes
proc startMaintainingSubscriptions*(wf: WakuFilter, interval: Duration) =
trace "starting to maintain subscriptions"
var maintainSubs: CallbackFunc
maintainSubs = CallbackFunc(
proc(udata: pointer) {.gcsafe.} =
maintainSubscriptions(wf)
wf.maintenanceTask = setTimer(Moment.fromNow(interval), maintainSubs)
)
wf.maintenanceTask = setTimer(Moment.fromNow(interval), maintainSubs)
method start*(wf: WakuFilter) {.async.} =
debug "starting filter protocol"
wf.startMaintainingSubscriptions(MaintainSubscriptionsInterval)
await procCall LPProtocol(wf).start()
method stop*(wf: WakuFilter) {.async.} =
debug "stopping filter protocol"
if not wf.maintenanceTask.isNil():
wf.maintenanceTask.clearTimer()
await procCall LPProtocol(wf).stop()