374 lines
9.9 KiB
Nim
374 lines
9.9 KiB
Nim
## Nim-Codex
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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 std/sequtils
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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/libp2p/utils/semaphore
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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 network, payments
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logScope:
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topics = "codex blockexcnetwork"
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const
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Codec* = "/codex/blockexc/1.0.0"
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MaxInflight* = 100
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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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WantListSender* = 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): 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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BlocksSender* = proc(peer: PeerId, presence: seq[bt.Block]): Future[void] {.gcsafe.}
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PresenceSender* = proc(peer: PeerId, presence: seq[BlockPresence]): Future[void] {.gcsafe.}
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AccountSender* = proc(peer: PeerId, account: Account): Future[void] {.gcsafe.}
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PaymentSender* = proc(peer: PeerId, payment: SignedState): Future[void] {.gcsafe.}
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BlockExcRequest* = object
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sendWantList*: WantListSender
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sendBlocks*: BlocksSender
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sendPresence*: PresenceSender
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sendAccount*: AccountSender
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sendPayment*: PaymentSender
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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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inflightSema: AsyncSemaphore
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proc send*(b: BlockExcNetwork, id: PeerId, msg: pb.Message) {.async.} =
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## Send message to peer
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##
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b.peers.withValue(id, peer):
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try:
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await b.inflightSema.acquire()
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trace "Sending message to peer", peer = id
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await peer[].send(msg)
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finally:
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b.inflightSema.release()
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do:
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trace "Unable to send, peer not found", peerId = id
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proc handleWantList(
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b: BlockExcNetwork,
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peer: NetworkPeer,
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list: Wantlist) {.async.} =
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## Handle incoming want list
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##
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if not b.handlers.onWantList.isNil:
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trace "Handling want list for peer", peer = peer.id, items = list.entries.len
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await 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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Wantlist(
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entries: cids.mapIt(
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Entry(
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`block`: it.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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full: full)
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proc sendWantList*(
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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): Future[void] =
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## Send a want message to peer
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##
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trace "Sending want list to peer", peer = id, `type` = $wantType, items = cids.len
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let msg = 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.send(id, Message(wantlist: msg))
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proc handleBlocks(
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b: BlockExcNetwork,
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peer: NetworkPeer,
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blocks: seq[pb.Block]) {.async.} =
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## Handle incoming blocks
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##
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if not b.handlers.onBlocks.isNil:
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trace "Handling blocks for peer", peer = peer.id, items = blocks.len
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var blks: seq[bt.Block]
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for blob in blocks:
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without cid =? Cid.init(blob.prefix):
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trace "Unable to initialize Cid from protobuf message"
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without blk =? bt.Block.new(cid, blob.data, verify = true):
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trace "Unable to initialize Block from data"
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blks.add(blk)
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await b.handlers.onBlocks(peer.id, blks)
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template makeBlocks*(blocks: seq[bt.Block]): 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 sendBlocks*(
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b: BlockExcNetwork,
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id: PeerId,
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blocks: seq[bt.Block]): Future[void] =
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## Send blocks to remote
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##
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b.send(id, 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]) {.async.} =
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## Handle block presence
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##
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if not b.handlers.onPresence.isNil:
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trace "Handling block presence for peer", peer = peer.id, items = presence.len
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await b.handlers.onPresence(peer.id, presence)
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proc sendBlockPresence*(
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b: BlockExcNetwork,
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id: PeerId,
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presence: seq[BlockPresence]): Future[void] =
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## Send presence to remote
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##
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b.send(id, Message(blockPresences: @presence))
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proc handleAccount(
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network: BlockExcNetwork,
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peer: NetworkPeer,
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account: Account) {.async.} =
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## Handle account info
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##
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if not network.handlers.onAccount.isNil:
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await network.handlers.onAccount(peer.id, account)
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proc sendAccount*(
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b: BlockExcNetwork,
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id: PeerId,
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account: Account): Future[void] =
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## Send account info to remote
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##
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b.send(id, Message(account: AccountMessage.init(account)))
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proc sendPayment*(
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b: BlockExcNetwork,
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id: PeerId,
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payment: SignedState): Future[void] =
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## Send payment to remote
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##
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b.send(id, Message(payment: StateChannelUpdate.init(payment)))
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proc handlePayment(
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network: BlockExcNetwork,
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peer: NetworkPeer,
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payment: SignedState) {.async.} =
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## Handle payment
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##
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if not network.handlers.onPayment.isNil:
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await 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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asyncSpawn b.handleWantList(peer, msg.wantlist)
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if msg.payload.len > 0:
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asyncSpawn b.handleBlocks(peer, msg.payload)
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if msg.blockPresences.len > 0:
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asyncSpawn b.handleBlockPresence(peer, msg.blockPresences)
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if account =? Account.init(msg.account):
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asyncSpawn b.handleAccount(peer, account)
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if payment =? SignedState.init(msg.payment):
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asyncSpawn 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.getOrDefault(peer, nil)
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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 dialPeer*(b: BlockExcNetwork, peer: PeerRecord) {.async.} =
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await b.switch.connect(peer.peerId, peer.addresses.mapIt(it.address))
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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,
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maxInflight = MaxInflight): T =
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## Create a new BlockExcNetwork instance
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##
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let
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self = BlockExcNetwork(
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switch: switch,
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getConn: connProvider,
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inflightSema: newAsyncSemaphore(maxInflight))
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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): Future[void] {.gcsafe.} =
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self.sendWantList(
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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]): Future[void] {.gcsafe.} =
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self.sendBlocks(id, blocks)
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proc sendPresence(id: PeerId, presence: seq[BlockPresence]): Future[void] {.gcsafe.} =
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self.sendBlockPresence(id, presence)
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proc sendAccount(id: PeerId, account: Account): Future[void] {.gcsafe.} =
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self.sendAccount(id, account)
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proc sendPayment(id: PeerId, payment: SignedState): Future[void] {.gcsafe.} =
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self.sendPayment(id, payment)
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self.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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self.init()
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return self
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