151 lines
4.3 KiB
Nim
151 lines
4.3 KiB
Nim
# Nim-LibP2P
|
|
# Copyright (c) 2023-2024 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.
|
|
|
|
{.push raises: [].}
|
|
|
|
import std/[hashes, oids, strformat]
|
|
import stew/results
|
|
import chronicles, chronos, metrics
|
|
import lpstream,
|
|
../multiaddress,
|
|
../peerinfo,
|
|
../errors
|
|
|
|
export lpstream, peerinfo, errors, results
|
|
|
|
logScope:
|
|
topics = "libp2p connection"
|
|
|
|
const
|
|
ConnectionTrackerName* = "Connection"
|
|
DefaultConnectionTimeout* = 5.minutes
|
|
|
|
type
|
|
TimeoutHandler* = proc(): Future[void] {.async: (raises: []).}
|
|
|
|
Connection* = ref object of LPStream
|
|
activity*: bool # reset every time data is sent or received
|
|
timeout*: Duration # channel timeout if no activity
|
|
timerTaskFut: Future[void].Raising([]) # the current timer instance
|
|
timeoutHandler*: TimeoutHandler # timeout handler
|
|
peerId*: PeerId
|
|
observedAddr*: Opt[MultiAddress]
|
|
protocol*: string # protocol used by the connection, used as metrics tag
|
|
transportDir*: Direction # underlying transport (usually socket) direction
|
|
when defined(libp2p_agents_metrics):
|
|
shortAgent*: string
|
|
|
|
proc timeoutMonitor(s: Connection) {.async: (raises: []).}
|
|
|
|
func shortLog*(conn: Connection): string =
|
|
try:
|
|
if conn == nil: "Connection(nil)"
|
|
else: &"{shortLog(conn.peerId)}:{conn.oid}"
|
|
except ValueError as exc:
|
|
raiseAssert(exc.msg)
|
|
|
|
chronicles.formatIt(Connection): shortLog(it)
|
|
|
|
method initStream*(s: Connection) =
|
|
if s.objName.len == 0:
|
|
s.objName = ConnectionTrackerName
|
|
|
|
procCall LPStream(s).initStream()
|
|
|
|
doAssert(s.timerTaskFut == nil)
|
|
|
|
if s.timeout > 0.millis:
|
|
trace "Monitoring for timeout", s, timeout = s.timeout
|
|
|
|
s.timerTaskFut = s.timeoutMonitor()
|
|
if s.timeoutHandler == nil:
|
|
s.timeoutHandler =
|
|
proc(): Future[void] {.async: (raises: [], raw: true).} =
|
|
trace "Idle timeout expired, closing connection", s
|
|
s.close()
|
|
|
|
method closeImpl*(s: Connection): Future[void] {.async: (raises: []).} =
|
|
# Cleanup timeout timer
|
|
trace "Closing connection", s
|
|
|
|
if s.timerTaskFut != nil and not s.timerTaskFut.finished:
|
|
# Don't `cancelAndWait` here to avoid risking deadlock in this scenario:
|
|
# - `pollActivity` is waiting for `s.timeoutHandler` to complete.
|
|
# - `s.timeoutHandler` may have triggered `closeImpl` and we are now here.
|
|
# In this situation, we have to return for `s.timerTaskFut` to complete.
|
|
s.timerTaskFut.cancelSoon()
|
|
s.timerTaskFut = nil
|
|
|
|
trace "Closed connection", s
|
|
|
|
procCall LPStream(s).closeImpl()
|
|
|
|
func hash*(p: Connection): Hash =
|
|
cast[pointer](p).hash
|
|
|
|
proc pollActivity(s: Connection): Future[bool] {.async: (raises: []).} =
|
|
if s.closed and s.atEof:
|
|
return false # Done, no more monitoring
|
|
|
|
if s.activity:
|
|
s.activity = false
|
|
return true
|
|
|
|
# Inactivity timeout happened, call timeout monitor
|
|
|
|
trace "Connection timed out", s
|
|
if s.timeoutHandler != nil:
|
|
trace "Calling timeout handler", s
|
|
await s.timeoutHandler()
|
|
|
|
return false
|
|
|
|
proc timeoutMonitor(s: Connection) {.async: (raises: []).} =
|
|
## monitor the channel for inactivity
|
|
##
|
|
## if the timeout was hit, it means that
|
|
## neither incoming nor outgoing activity
|
|
## has been detected and the channel will
|
|
## be reset
|
|
##
|
|
|
|
while true:
|
|
try: # Sleep at least once!
|
|
await sleepAsync(s.timeout)
|
|
except CancelledError:
|
|
return
|
|
|
|
if not await s.pollActivity():
|
|
return
|
|
|
|
method getWrapped*(s: Connection): Connection {.base.} =
|
|
raiseAssert("Not implemented!")
|
|
|
|
when defined(libp2p_agents_metrics):
|
|
proc setShortAgent*(s: Connection, shortAgent: string) =
|
|
var conn = s
|
|
while conn != nil:
|
|
conn.shortAgent = shortAgent
|
|
conn = conn.getWrapped()
|
|
|
|
proc new*(
|
|
C: type Connection,
|
|
peerId: PeerId,
|
|
dir: Direction,
|
|
observedAddr: Opt[MultiAddress],
|
|
timeout: Duration = DefaultConnectionTimeout,
|
|
timeoutHandler: TimeoutHandler = nil): Connection =
|
|
result = C(peerId: peerId,
|
|
dir: dir,
|
|
timeout: timeout,
|
|
timeoutHandler: timeoutHandler,
|
|
observedAddr: observedAddr)
|
|
|
|
result.initStream()
|