363 lines
9.4 KiB
Nim
363 lines
9.4 KiB
Nim
## Nim-Dagger
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## Copyright (c) 2021 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import std/tables
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import pkg/chronicles
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import pkg/chronos
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import pkg/libp2p
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import pkg/questionable
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import pkg/questionable/results
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import ../blocktype as bt
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import ./protobuf/blockexc as pb
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import ./protobuf/payments
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import ./networkpeer
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export networkpeer, payments
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logScope:
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topics = "dagger blockexc network"
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const Codec* = "/dagger/blockexc/1.0.0"
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type
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WantListHandler* = proc(peer: PeerID, wantList: WantList): Future[void] {.gcsafe.}
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BlocksHandler* = proc(peer: PeerID, blocks: seq[bt.Block]): Future[void] {.gcsafe.}
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BlockPresenceHandler* = proc(peer: PeerID, precense: seq[BlockPresence]): Future[void] {.gcsafe.}
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AccountHandler* = proc(peer: PeerID, account: Account): Future[void] {.gcsafe.}
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PaymentHandler* = proc(peer: PeerID, payment: SignedState): Future[void] {.gcsafe.}
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BlockExcHandlers* = object
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onWantList*: WantListHandler
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onBlocks*: BlocksHandler
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onPresence*: BlockPresenceHandler
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onAccount*: AccountHandler
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onPayment*: PaymentHandler
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WantListBroadcaster* = proc(
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id: PeerID,
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cids: seq[Cid],
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priority: int32 = 0,
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cancel: bool = false,
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wantType: WantType = WantType.wantHave,
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full: bool = false,
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sendDontHave: bool = false) {.gcsafe.}
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BlocksBroadcaster* = proc(peer: PeerID, presence: seq[bt.Block]) {.gcsafe.}
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PresenceBroadcaster* = proc(peer: PeerID, presence: seq[BlockPresence]) {.gcsafe.}
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AccountBroadcaster* = proc(peer: PeerID, account: Account) {.gcsafe.}
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PaymentBroadcaster* = proc(peer: PeerID, payment: SignedState) {.gcsafe.}
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BlockExcRequest* = object
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sendWantList*: WantListBroadcaster
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sendBlocks*: BlocksBroadcaster
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sendPresence*: PresenceBroadcaster
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sendAccount*: AccountBroadcaster
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sendPayment*: PaymentBroadcaster
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BlockExcNetwork* = ref object of LPProtocol
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peers*: Table[PeerID, NetworkPeer]
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switch*: Switch
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handlers*: BlockExcHandlers
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request*: BlockExcRequest
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getConn: ConnProvider
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proc handleWantList(
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b: BlockExcNetwork,
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peer: NetworkPeer,
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list: WantList): Future[void] =
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## Handle incoming want list
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##
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if isNil(b.handlers.onWantList):
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return
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trace "Handling want list for peer", peer = peer.id
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b.handlers.onWantList(peer.id, list)
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# TODO: make into a template
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proc makeWantList*(
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cids: seq[Cid],
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priority: int = 0,
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cancel: bool = false,
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wantType: WantType = WantType.wantHave,
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full: bool = false,
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sendDontHave: bool = false): WantList =
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var entries: seq[Entry]
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for cid in cids:
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entries.add(Entry(
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`block`: cid.data.buffer,
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priority: priority.int32,
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cancel: cancel,
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wantType: wantType,
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sendDontHave: sendDontHave))
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WantList(entries: entries, full: full)
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proc broadcastWantList*(
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b: BlockExcNetwork,
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id: PeerID,
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cids: seq[Cid],
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priority: int32 = 0,
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cancel: bool = false,
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wantType: WantType = WantType.wantHave,
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full: bool = false,
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sendDontHave: bool = false) =
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## send a want message to peer
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##
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if id notin b.peers:
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return
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trace "Sending want list to peer", peer = id, `type` = $wantType, len = cids.len
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let wantList = makeWantList(
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cids,
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priority,
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cancel,
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wantType,
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full,
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sendDontHave)
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b.peers[id].broadcast(Message(wantlist: wantList))
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proc handleBlocks(
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b: BlockExcNetwork,
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peer: NetworkPeer,
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blocks: seq[auto]): Future[void] =
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## Handle incoming blocks
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##
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if isNil(b.handlers.onBlocks):
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return
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trace "Handling blocks for peer", peer = peer.id
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var blks: seq[bt.Block]
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for blk in blocks:
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when blk is pb.Block:
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blks.add(bt.Block.init(Cid.init(blk.prefix).get(), blk.data))
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elif blk is seq[byte]:
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blks.add(bt.Block.init(Cid.init(blk).get(), blk))
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else:
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error("Invalid block type")
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b.handlers.onBlocks(peer.id, blks)
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template makeBlocks*(
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blocks: seq[bt.Block]):
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seq[pb.Block] =
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var blks: seq[pb.Block]
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for blk in blocks:
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blks.add(pb.Block(
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prefix: blk.cid.data.buffer,
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data: blk.data
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))
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blks
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proc broadcastBlocks*(
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b: BlockExcNetwork,
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id: PeerID,
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blocks: seq[bt.Block]) =
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## Send blocks to remote
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##
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if id notin b.peers:
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return
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trace "Sending blocks to peer", peer = id, len = blocks.len
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b.peers[id].broadcast(pb.Message(payload: makeBlocks(blocks)))
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proc handleBlockPresence(
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b: BlockExcNetwork,
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peer: NetworkPeer,
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presence: seq[BlockPresence]): Future[void] =
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## Handle block presence
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##
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if isNil(b.handlers.onPresence):
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return
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trace "Handling block presence for peer", peer = peer.id
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b.handlers.onPresence(peer.id, presence)
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proc broadcastBlockPresence*(
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b: BlockExcNetwork,
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id: PeerID,
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presence: seq[BlockPresence]) =
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## Send presence to remote
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##
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if id notin b.peers:
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return
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trace "Sending presence to peer", peer = id
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b.peers[id].broadcast(Message(blockPresences: presence))
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proc handleAccount(network: BlockExcNetwork,
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peer: NetworkPeer,
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account: Account): Future[void] =
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if network.handlers.onAccount.isNil:
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return
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network.handlers.onAccount(peer.id, account)
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proc broadcastAccount*(network: BlockExcNetwork,
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id: PeerId,
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account: Account) =
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if id notin network.peers:
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return
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let message = Message(account: AccountMessage.init(account))
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network.peers[id].broadcast(message)
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proc broadcastPayment*(network: BlockExcNetwork,
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id: PeerId,
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payment: SignedState) =
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if id notin network.peers:
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return
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let message = Message(payment: StateChannelUpdate.init(payment))
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network.peers[id].broadcast(message)
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proc handlePayment(network: BlockExcNetwork,
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peer: NetworkPeer,
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payment: SignedState): Future[void] =
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if network.handlers.onPayment.isNil:
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return
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network.handlers.onPayment(peer.id, payment)
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proc rpcHandler(b: BlockExcNetwork, peer: NetworkPeer, msg: Message) {.async.} =
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try:
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if msg.wantlist.entries.len > 0:
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await b.handleWantList(peer, msg.wantlist)
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if msg.payload.len > 0:
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await b.handleBlocks(peer, msg.payload)
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if msg.blockPresences.len > 0:
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await b.handleBlockPresence(peer, msg.blockPresences)
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if account =? Account.init(msg.account):
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await b.handleAccount(peer, account)
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if payment =? SignedState.init(msg.payment):
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await b.handlePayment(peer, payment)
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except CatchableError as exc:
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trace "Exception in blockexc rpc handler", exc = exc.msg
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proc getOrCreatePeer(b: BlockExcNetwork, peer: PeerID): NetworkPeer =
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## Creates or retrieves a BlockExcNetwork Peer
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##
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if peer in b.peers:
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return b.peers[peer]
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var getConn = proc(): Future[Connection] {.async.} =
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try:
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return await b.switch.dial(peer, Codec)
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except CatchableError as exc:
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trace "unable to connect to blockexc peer", exc = exc.msg
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if not isNil(b.getConn):
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getConn = b.getConn
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let rpcHandler = proc (p: NetworkPeer, msg: Message): Future[void] =
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b.rpcHandler(p, msg)
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# create new pubsub peer
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let blockExcPeer = NetworkPeer.new(peer, getConn, rpcHandler)
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debug "created new blockexc peer", peer
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b.peers[peer] = blockExcPeer
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return blockExcPeer
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proc setupPeer*(b: BlockExcNetwork, peer: PeerID) =
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## Perform initial setup, such as want
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## list exchange
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##
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discard b.getOrCreatePeer(peer)
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proc dropPeer*(b: BlockExcNetwork, peer: PeerID) =
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## Cleanup disconnected peer
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##
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b.peers.del(peer)
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method init*(b: BlockExcNetwork) =
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## Perform protocol initialization
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##
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proc peerEventHandler(peerId: PeerID, event: PeerEvent) {.async.} =
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if event.kind == PeerEventKind.Joined:
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b.setupPeer(peerId)
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else:
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b.dropPeer(peerId)
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b.switch.addPeerEventHandler(peerEventHandler, PeerEventKind.Joined)
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b.switch.addPeerEventHandler(peerEventHandler, PeerEventKind.Left)
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proc handle(conn: Connection, proto: string) {.async, gcsafe, closure.} =
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let peerId = conn.peerId
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let blockexcPeer = b.getOrCreatePeer(peerId)
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await blockexcPeer.readLoop(conn) # attach read loop
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b.handler = handle
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b.codec = Codec
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proc new*(
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T: type BlockExcNetwork,
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switch: Switch,
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connProvider: ConnProvider = nil): T =
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## Create a new BlockExcNetwork instance
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##
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let b = BlockExcNetwork(
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switch: switch,
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getConn: connProvider)
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proc sendWantList(
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id: PeerID,
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cids: seq[Cid],
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priority: int32 = 0,
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cancel: bool = false,
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wantType: WantType = WantType.wantHave,
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full: bool = false,
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sendDontHave: bool = false) {.gcsafe.} =
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b.broadcastWantList(
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id, cids, priority, cancel,
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wantType, full, sendDontHave)
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proc sendBlocks(id: PeerID, blocks: seq[bt.Block]) {.gcsafe.} =
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b.broadcastBlocks(id, blocks)
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proc sendPresence(id: PeerID, presence: seq[BlockPresence]) {.gcsafe.} =
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b.broadcastBlockPresence(id, presence)
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proc sendAccount(id: PeerID, account: Account) =
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b.broadcastAccount(id, account)
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proc sendPayment(id: PeerID, payment: SignedState) =
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b.broadcastPayment(id, payment)
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b.request = BlockExcRequest(
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sendWantList: sendWantList,
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sendBlocks: sendBlocks,
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sendPresence: sendPresence,
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sendAccount: sendAccount,
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sendPayment: sendPayment
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)
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b.init()
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return b
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