# beacon_chain # Copyright (c) 2018-2021 Status Research & Development GmbH # Licensed and distributed under either of # * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT). # * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0). # at your option. This file may not be copied, modified, or distributed except according to those terms. {.push raises: [Defect].} # Common routines for a BeaconNode and a ValidatorClient import # Standard library std/[os, tables, strutils, typetraits], # Nimble packages chronos, confutils/defs, chronicles, chronicles/helpers as chroniclesHelpers, chronicles/topics_registry, stew/io2, # Local modules ./spec/[helpers], ./spec/datatypes/base, "."/[beacon_clock, filepath, beacon_node_status], ./networking/eth2_network when defined(posix): import termios type SlotStartProc*[T] = proc(node: T, wallTime: BeaconTime, lastSlot: Slot): Future[void] {.gcsafe, raises: [Defect].} proc setupStdoutLogging*(logLevel: string) = when compiles(defaultChroniclesStream.output.writer): defaultChroniclesStream.outputs[0].writer = proc (logLevel: LogLevel, msg: LogOutputStr) {.gcsafe, raises: [Defect].} = try: stdout.write(msg) stdout.flushFile() except IOError as err: logLoggingFailure(cstring(msg), err) proc updateLogLevel*(logLevel: string) {.raises: [Defect, ValueError].} = # Updates log levels (without clearing old ones) let directives = logLevel.split(";") try: setLogLevel(parseEnum[LogLevel](directives[0])) except ValueError: raise (ref ValueError)(msg: "Please specify one of TRACE, DEBUG, INFO, NOTICE, WARN, ERROR or FATAL") if directives.len > 1: for topicName, settings in parseTopicDirectives(directives[1..^1]): if not setTopicState(topicName, settings.state, settings.logLevel): warn "Unrecognized logging topic", topic = topicName proc setupLogging*(logLevel: string, logFile: Option[OutFile]) = if logFile.isSome: when defaultChroniclesStream.outputs.type.arity > 1: block openLogFile: let logFile = logFile.get.string logFileDir = splitFile(logFile).dir let lres = secureCreatePath(logFileDir) if lres.isErr(): error "Failed to create directory for log file", path = logFileDir, err = ioErrorMsg(lres.error) break openLogFile try: if not defaultChroniclesStream.outputs[1].open(logFile): error "Failed to create log file", logFile except CatchableError as exc: # TODO why is there both exception and bool? error "Failed to create log file", logFile, msg = exc.msg else: warn "The --log-file option is not active in the current build" try: updateLogLevel(logLevel) except ValueError as err: try: stderr.write "Invalid value for --log-level. " & err.msg except IOError: echo "Invalid value for --log-level. " & err.msg quit 1 template makeBannerAndConfig*(clientId: string, ConfType: type): untyped = let version = clientId & "\p" & copyrights & "\p\p" & "eth2 specification v" & SPEC_VERSION & "\p\p" & nimBanner # TODO for some reason, copyrights are printed when doing `--help` {.push warning[ProveInit]: off.} let config = ConfType.load( version = version, copyrightBanner = clientId) # but a short version string makes more sense... {.pop.} config # TODO not sure if this belongs here but it doesn't belong in `beacon_clock.nim` either proc sleepToSlotOffset*(clock: BeaconClock, extra: chronos.Duration, slot: Slot, msg: static string): Future[bool] {.async.} = let fromNow = clock.fromNow(slot.toBeaconTime(extra)) if fromNow.inFuture: trace msg, slot = shortLog(slot), fromNow = shortLog(fromNow.offset) await sleepAsync(fromNow.offset) return true return false proc checkIfShouldStopAtEpoch*(scheduledSlot: Slot, stopAtEpoch: uint64) = # Offset backwards slightly to allow this epoch's finalization check to occur if scheduledSlot > 3 and stopAtEpoch > 0'u64 and (scheduledSlot - 3).compute_epoch_at_slot() >= stopAtEpoch: info "Stopping at pre-chosen epoch", chosenEpoch = stopAtEpoch, epoch = scheduledSlot.compute_epoch_at_slot(), slot = scheduledSlot # Brute-force, but ensure it's reliable enough to run in CI. quit(0) proc resetStdin*() = when defined(posix): # restore echoing, in case it was disabled by a password prompt let fd = stdin.getFileHandle() var attrs: Termios discard fd.tcGetAttr(attrs.addr) attrs.c_lflag = attrs.c_lflag or Cflag(ECHO) discard fd.tcSetAttr(TCSANOW, attrs.addr) proc runSlotLoop*[T](node: T, startTime: BeaconTime, slotProc: SlotStartProc[T]) {.async.} = var curSlot = startTime.slotOrZero() nextSlot = curSlot + 1 # No earlier than GENESIS_SLOT + 1 timeToNextSlot = nextSlot.toBeaconTime() - startTime info "Scheduling first slot action", startTime = shortLog(startTime), nextSlot = shortLog(nextSlot), timeToNextSlot = shortLog(timeToNextSlot) while true: # Start by waiting for the time when the slot starts. Sleeping relinquishes # control to other tasks which may or may not finish within the alotted # time, so below, we need to be wary that the ship might have sailed # already. await sleepAsync(timeToNextSlot) let wallTime = node.beaconClock.now() wallSlot = wallTime.slotOrZero() # Always > GENESIS! if wallSlot < nextSlot: # While we were sleeping, the system clock changed and time moved # backwards! if wallSlot + 1 < nextSlot: # This is a critical condition where it's hard to reason about what # to do next - we'll call the attention of the user here by shutting # down. fatal "System time adjusted backwards significantly - clock may be inaccurate - shutting down", nextSlot = shortLog(nextSlot), wallSlot = shortLog(wallSlot) bnStatus = BeaconNodeStatus.Stopping return # Time moved back by a single slot - this could be a minor adjustment, # for example when NTP does its thing after not working for a while warn "System time adjusted backwards, rescheduling slot actions", wallTime = shortLog(wallTime), nextSlot = shortLog(nextSlot), wallSlot = shortLog(wallSlot) # cur & next slot remain the same timeToNextSlot = nextSlot.toBeaconTime() - wallTime continue if wallSlot > nextSlot + SLOTS_PER_EPOCH: # Time moved forwards by more than an epoch - either the clock was reset # or we've been stuck in processing for a long time - either way, we will # skip ahead so that we only process the events of the last # SLOTS_PER_EPOCH slots warn "Time moved forwards by more than an epoch, skipping ahead", curSlot = shortLog(curSlot), nextSlot = shortLog(nextSlot), wallSlot = shortLog(wallSlot) curSlot = wallSlot - SLOTS_PER_EPOCH elif wallSlot > nextSlot: notice "Missed expected slot start, catching up", delay = shortLog(wallTime - nextSlot.toBeaconTime()), curSlot = shortLog(curSlot), nextSlot = shortLog(curSlot) await slotProc(node, wallTime, curSlot) curSlot = wallSlot nextSlot = wallSlot + 1 timeToNextSlot = saturate(node.beaconClock.fromNow(nextSlot))