123 lines
3.4 KiB
Nim
123 lines
3.4 KiB
Nim
# Nimbus
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# Copyright (c) 2022 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
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std/[tables],
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chronicles,
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chronos,
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eth/p2p,
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eth/p2p/peer_pool,
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./protocol
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# Currently, this module only handles static peers
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# but we can extend it to handles trusted peers as well
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# or bootnodes
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type
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ReconnectState = ref object
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node: Node
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retryCount: int
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connected: bool
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PMState = enum
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Starting, Running, Stopping, Stopped
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PeerManagerRef* = ref object
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state: PMState
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pool: PeerPool
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maxRetryCount: int # zero == infinite
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retryInterval: int # in seconds
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reconnectStates: seq[ReconnectState]
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reconnectFut: Future[void]
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logScope:
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topics = "PeerManagerRef"
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proc setConnected(pm: PeerManagerRef, peer: Peer, connected: bool) =
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for n in pm.reconnectStates:
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if peer.remote.id == n.node.id:
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n.connected = connected
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return
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doAssert(false, "unreachable code")
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proc needReconnect(pm: PeerManagerRef): bool =
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for n in pm.reconnectStates:
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if not n.connected:
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return true
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proc reconnect(pm: PeerManagerRef) {.async, gcsafe.} =
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for n in pm.reconnectStates:
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if not n.connected and pm.state == Running:
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if n.retryCount < pm.maxRetryCount or pm.maxRetryCount == 0:
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trace "Reconnecting to", remote=n.node.node
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await pm.pool.connectToNode(n.node)
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inc n.retryCount
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elif n.retryCount == pm.maxRetryCount:
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trace "Exceed max retry count, give up reconnecting", remote=n.node.node
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inc n.retryCount
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proc runReconnectLoop(pm: PeerManagerRef) {.async, gcsafe.} =
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while pm.state == Running:
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if pm.needReconnect:
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await pm.reconnect
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else:
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pm.state = Stopping
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break
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await sleepAsync(pm.retryInterval.seconds)
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proc setupManager(pm: PeerManagerRef, enodes: openArray[ENode]) =
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var po: PeerObserver
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po.onPeerConnected = proc(peer: Peer) {.gcsafe.} =
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trace "Peer connected", remote=peer.remote.node
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pm.setConnected(peer, true)
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po.onPeerDisconnected = proc(peer: Peer) {.gcsafe.} =
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trace "Peer disconnected", remote=peer.remote.node
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pm.setConnected(peer, false)
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if pm.state notin {Running, Stopped}:
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pm.state = Running
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pm.reconnectFut = pm.runReconnectLoop()
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po.setProtocol eth
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pm.pool.addObserver(pm, po)
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for enode in enodes:
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let state = ReconnectState(
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node: newNode(enode),
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retryCount: 0,
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connected: false
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)
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pm.reconnectStates.add(state)
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proc new*(_: type PeerManagerRef,
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pool: PeerPool,
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retryInterval: int,
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maxRetryCount: int,
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enodes: openArray[ENode]): PeerManagerRef =
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result = PeerManagerRef(
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pool: pool,
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state: Starting,
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maxRetryCount: max(0, maxRetryCount),
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retryInterval: max(5, retryInterval)
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)
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result.setupManager(enodes)
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proc start*(pm: PeerManagerRef) =
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if pm.state notin {Stopped, Running} and pm.needReconnect:
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pm.state = Running
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pm.reconnectFut = pm.runReconnectLoop()
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info "Reconnecting to static peers"
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proc stop*(pm: PeerManagerRef) {.async.} =
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if pm.state notin {Stopped, Stopping}:
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pm.state = Stopped
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await pm.reconnectFut.cancelAndWait()
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info "Peer manager stopped"
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