nim-libp2p/libp2p/errors.nim

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# this module will be further extended in PR
# https://github.com/status-im/nim-libp2p/pull/107/
import chronos
import chronicles
import macros
type
# Base exception type for libp2p
LPError* = object of CatchableError
func toException*(e: cstring): ref LPError =
(ref LPError)(msg: $e)
func toException*(e: string): ref LPError =
(ref LPError)(msg: e)
# TODO: could not figure how to make it with a simple template
# sadly nim needs more love for hygienic templates
# so here goes the macro, its based on the proc/template version
# and uses quote do so it's quite readable
macro checkFutures*[T](futs: seq[Future[T]], exclude: untyped = []): untyped =
let nexclude = exclude.len
case nexclude
of 0:
quote do:
for res in `futs`:
if res.failed:
let exc = res.readError()
# We still don't abort but warn
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debug "A future has failed, enable trace logging for details", error = exc.name
trace "Exception message", msg= exc.msg, stack = getStackTrace()
else:
quote do:
for res in `futs`:
block check:
if res.failed:
let exc = res.readError()
for i in 0..<`nexclude`:
if exc of `exclude`[i]:
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trace "A future has failed", error=exc.name, msg=exc.msg
break check
# We still don't abort but warn
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debug "A future has failed, enable trace logging for details", error=exc.name
trace "Exception details", msg=exc.msg
proc allFuturesThrowing*[T](args: varargs[Future[T]]): Future[void] =
var futs: seq[Future[T]]
for fut in args:
futs &= fut
proc call() {.async.} =
var first: ref Exception = nil
futs = await allFinished(futs)
for fut in futs:
if fut.failed:
let err = fut.readError()
if err of Defect:
raise err
else:
if err of CancelledError:
raise err
if isNil(first):
first = err
if not isNil(first):
raise first
return call()
template tryAndWarn*(message: static[string]; body: untyped): untyped =
try:
body
except CancelledError as exc:
raise exc
except CatchableError as exc:
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debug "An exception has ocurred, enable trace logging for details", name = exc.name, msg = message
trace "Exception details", exc = exc.msg