mirror of https://github.com/waku-org/nwaku.git
101 lines
3.4 KiB
Nim
101 lines
3.4 KiB
Nim
{.push raises: [Exception, Defect].}
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import
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std/[tables,sequtils],
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json_rpc/rpcserver,
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libp2p/protocols/pubsub/pubsub,
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eth/[common, rlp, keys, p2p],
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../../waku_types,
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../wakunode2,
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./jsonrpc_types, ./jsonrpc_utils
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const futTimeout = 5.seconds
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proc installRelayApiHandlers*(node: WakuNode, rpcsrv: RpcServer) =
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## Create a per-topic message cache
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var
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topicCache = initTable[string, seq[WakuMessage]]()
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proc topicHandler(topic: string, data: seq[byte]) {.async.} =
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debug "Topic handler triggered"
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let msg = WakuMessage.init(data)
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if msg.isOk():
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debug "WakuMessage received", msg=msg, topic=topic
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# Add message to current cache
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# @TODO limit max topics and messages
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topicCache.mgetOrPut(topic, @[]).add(msg[])
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else:
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debug "WakuMessage received but failed to decode", msg=msg, topic=topic
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# @TODO handle message decode failure
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## Relay API version 1 definitions
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rpcsrv.rpc("post_waku_v2_relay_v1_message") do(topic: string, message: WakuRelayMessage) -> bool:
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## Publishes a WakuMessage to a PubSub topic
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debug "post_waku_v2_relay_v1_message"
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node.publish(topic, message.toWakuMessage(version = 0))
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return true
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rpcsrv.rpc("get_waku_v2_relay_v1_messages") do(topic: string) -> seq[WakuMessage]:
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## Returns all WakuMessages received on a PubSub topic since the
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## last time this method was called
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## @TODO ability to specify a return message limit
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debug "get_waku_v2_relay_v1_messages", topic=topic
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if topicCache.hasKey(topic):
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let msgs = topicCache[topic]
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# Clear cache before next call
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topicCache[topic] = @[]
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return msgs
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else:
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# Not subscribed to this topic
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raise newException(ValueError, "Not subscribed to topic: " & topic)
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rpcsrv.rpc("post_waku_v2_relay_v1_subscriptions") do(topics: seq[string]) -> bool:
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## Subscribes a node to a list of PubSub topics
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debug "post_waku_v2_relay_v1_subscriptions"
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var failedTopics: seq[string]
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# Subscribe to all requested topics
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for topic in topics:
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if not(await node.subscribe(topic, topicHandler).withTimeout(futTimeout)):
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# If any topic fails to subscribe, add to list of failedTopics
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failedTopics.add(topic)
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else:
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# Create message cache for this topic
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debug "MessageCache for topic", topic=topic
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topicCache[topic] = @[]
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if (failedTopics.len() == 0):
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# Successfully subscribed to all requested topics
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return true
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else:
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# Failed to subscribe to one or more topics
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raise newException(ValueError, "Failed to subscribe to topics " & repr(failedTopics))
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rpcsrv.rpc("delete_waku_v2_relay_v1_subscriptions") do(topics: seq[string]) -> bool:
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## Unsubscribes a node from a list of PubSub topics
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debug "delete_waku_v2_relay_v1_subscriptions"
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var failedTopics: seq[string]
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# Unsubscribe all handlers from requested topics
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for topic in topics:
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if not(await node.unsubscribeAll(topic).withTimeout(futTimeout)):
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# If any topic fails to unsubscribe, add to list of failedTopics
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failedTopics.add(topic)
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else:
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# Remove message cache for topic
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topicCache.del(topic)
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if (failedTopics.len() == 0):
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# Successfully unsubscribed from all requested topics
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return true
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else:
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# Failed to unsubscribe from one or more topics
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raise newException(ValueError, "Failed to unsubscribe from topics " & repr(failedTopics))
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