nim-codex/dagger/blockexchange/networkpeer.nim

81 lines
2.0 KiB
Nim

## Nim-Dagger
## Copyright (c) 2021 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import pkg/chronos
import pkg/chronicles
import pkg/protobuf_serialization
import pkg/libp2p
import ./protobuf/blockexc
logScope:
topics = "dagger blockexc networkpeer"
const MaxMessageSize = 8 * 1024 * 1024
type
RPCHandler* = proc(peer: NetworkPeer, msg: Message): Future[void] {.gcsafe.}
NetworkPeer* = ref object of RootObj
id*: PeerId
handler*: RPCHandler
sendConn: Connection
getConn: ConnProvider
proc connected*(b: NetworkPeer): bool =
not(isNil(b.sendConn)) and
not(b.sendConn.closed or b.sendConn.atEof)
proc readLoop*(b: NetworkPeer, conn: Connection) {.async.} =
if isNil(conn):
return
try:
while not conn.atEof:
let data = await conn.readLp(MaxMessageSize)
let msg: Message = Protobuf.decode(data, Message)
trace "Got message for peer", peer = b.id, msg
await b.handler(b, msg)
except CatchableError as exc:
trace "Exception in blockexc read loop", exc = exc.msg
finally:
await conn.close()
proc connect*(b: NetworkPeer): Future[Connection] {.async.} =
if b.connected:
return b.sendConn
b.sendConn = await b.getConn()
asyncSpawn b.readLoop(b.sendConn)
return b.sendConn
proc send*(b: NetworkPeer, msg: Message) {.async.} =
let conn = await b.connect()
if isNil(conn):
trace "Unable to get send connection for peer message not sent", peer = b.id
return
trace "Sending message to remote", peer = b.id, msg = $msg
await conn.writeLp(Protobuf.encode(msg))
func new*(
T: type NetworkPeer,
peer: PeerId,
connProvider: ConnProvider,
rpcHandler: RPCHandler): T =
doAssert(not isNil(connProvider),
"should supply connection provider")
NetworkPeer(
id: peer,
getConn: connProvider,
handler: rpcHandler)