nwaku/waku/protocol/v2/waku_store.nim

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import
std/tables,
chronos, chronicles, metrics, stew/results,
libp2p/protocols/pubsub/rpc/[messages, protobuf],
libp2p/protocols/protocol,
libp2p/protobuf/minprotobuf,
libp2p/stream/connection,
./message_notifier
const
WakuStoreCodec* = "/vac/waku/store/2.0.0-alpha2"
type
StoreRPC* = object
query*: seq[HistoryQuery]
response*: seq[HistoryResponse]
HistoryQuery* = object
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uuid*: string
topics*: seq[string]
HistoryResponse* = object
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uuid*: string
messages*: seq[Message]
WakuStore* = ref object of LPProtocol
messages*: seq[Message]
proc init*(T: type HistoryQuery, buffer: seq[byte]): ProtoResult[T] =
var msg = HistoryQuery()
let pb = initProtoBuffer(buffer)
var topics: seq[string]
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discard ? pb.getField(1, msg.uuid)
discard ? pb.getRepeatedField(2, topics)
msg.topics = topics
ok(msg)
proc init*(T: type HistoryResponse, buffer: seq[byte]): ProtoResult[T] =
var msg = HistoryResponse()
let pb = initProtoBuffer(buffer)
var messages: seq[seq[byte]]
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discard ? pb.getField(1, msg.uuid)
discard ? pb.getRepeatedField(2, messages)
for buf in messages:
msg.messages.add(? protobuf.decodeMessage(initProtoBuffer(buf)))
ok(msg)
proc init*(T: type StoreRPC, buffer: seq[byte]): ProtoResult[T] =
var rpc = StoreRPC()
let pb = initProtoBuffer(buffer)
var queries: seq[seq[byte]]
discard ? pb.getRepeatedField(1, queries)
for buffer in queries:
rpc.query.add(? HistoryQuery.init(buffer))
var responses: seq[seq[byte]]
discard ? pb.getRepeatedField(2, responses)
for buffer in responses:
rpc.response.add(? HistoryResponse.init(buffer))
ok(rpc)
proc encode*(query: HistoryQuery): ProtoBuffer =
result = initProtoBuffer()
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result.write(1, query.uuid)
for topic in query.topics:
result.write(2, topic)
proc encode*(response: HistoryResponse): ProtoBuffer =
result = initProtoBuffer()
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result.write(1, response.uuid)
for msg in response.messages:
result.write(2, msg.encodeMessage())
proc encode*(response: StoreRPC): ProtoBuffer =
result = initProtoBuffer()
for query in response.query:
result.write(1, query.encode().buffer)
for response in response.response:
result.write(2, response.encode().buffer)
proc query(w: WakuStore, query: HistoryQuery): HistoryResponse =
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result = HistoryResponse(uuid: query.uuid, messages: newSeq[Message]())
for msg in w.messages:
for topic in query.topics:
if topic in msg.topicIDs:
result.messages.insert(msg)
break
proc init*(T: type WakuStore): T =
var ws = WakuStore()
proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
var message = await conn.readLp(64*1024)
var rpc = StoreRPC.init(message)
if rpc.isErr:
return
info "received query"
var response = StoreRPC(query: newSeq[HistoryQuery](0), response: newSeq[HistoryResponse](0))
for query in rpc.value.query:
let res = ws.query(query)
response.response.add(res)
await conn.writeLp(response.encode().buffer)
ws.handler = handle
ws.codec = WakuStoreCodec
result = ws
proc subscription*(proto: WakuStore): MessageNotificationSubscription =
## The filter function returns the pubsub filter for the node.
## This is used to pipe messages into the storage, therefore
## the filter should be used by the component that receives
## new messages.
proc handle(msg: Message) =
proto.messages.add(msg)
MessageNotificationSubscription.init(@[], handle)