mirror of https://github.com/waku-org/nwaku.git
103 lines
2.5 KiB
Nim
103 lines
2.5 KiB
Nim
import
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std/tables,
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chronos, chronicles, metrics, stew/results,
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libp2p/protocols/pubsub/rpc/[messages, protobuf],
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libp2p/protocols/protocol,
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libp2p/protobuf/minprotobuf,
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libp2p/stream/connection,
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./message_notifier
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const
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WakuStoreCodec* = "/vac/waku/store/2.0.0-alpha4"
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type
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HistoryQuery* = object
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uuid*: string
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topics*: seq[string]
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HistoryResponse* = object
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uuid*: string
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messages*: seq[Message]
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WakuStore* = ref object of LPProtocol
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messages*: seq[Message]
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proc init*(T: type HistoryQuery, buffer: seq[byte]): ProtoResult[T] =
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var msg = HistoryQuery()
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let pb = initProtoBuffer(buffer)
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var topics: seq[string]
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discard ? pb.getField(1, msg.uuid)
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discard ? pb.getRepeatedField(2, topics)
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msg.topics = topics
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ok(msg)
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proc init*(T: type HistoryResponse, buffer: seq[byte]): ProtoResult[T] =
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var msg = HistoryResponse()
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let pb = initProtoBuffer(buffer)
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var messages: seq[seq[byte]]
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discard ? pb.getField(1, msg.uuid)
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discard ? pb.getRepeatedField(2, messages)
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for buf in messages:
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msg.messages.add(? protobuf.decodeMessage(initProtoBuffer(buf)))
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ok(msg)
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proc encode*(query: HistoryQuery): ProtoBuffer =
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result = initProtoBuffer()
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result.write(1, query.uuid)
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for topic in query.topics:
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result.write(2, topic)
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proc encode*(response: HistoryResponse): ProtoBuffer =
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result = initProtoBuffer()
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result.write(1, response.uuid)
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for msg in response.messages:
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result.write(2, msg.encodeMessage())
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proc query(w: WakuStore, query: HistoryQuery): HistoryResponse =
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result = HistoryResponse(uuid: query.uuid, messages: newSeq[Message]())
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for msg in w.messages:
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for topic in query.topics:
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if topic in msg.topicIDs:
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result.messages.insert(msg)
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break
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proc init*(T: type WakuStore): T =
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var ws = WakuStore()
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proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
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var message = await conn.readLp(64*1024)
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var rpc = HistoryQuery.init(message)
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if rpc.isErr:
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return
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info "received query"
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let res = ws.query(rpc.value)
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await conn.writeLp(res.encode().buffer)
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ws.handler = handle
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ws.codec = WakuStoreCodec
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result = ws
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proc subscription*(proto: WakuStore): MessageNotificationSubscription =
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## The filter function returns the pubsub filter for the node.
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## This is used to pipe messages into the storage, therefore
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## the filter should be used by the component that receives
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## new messages.
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proc handle(msg: Message) =
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proto.messages.add(msg)
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MessageNotificationSubscription.init(@[], handle)
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