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
# could not figure how to make it with a simple template
# sadly nim needs more love for hygenic 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
warn "Something went wrong in a future", error=exc.name
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]:
trace "Ignoring an error (no warning)", error=exc.name
break check
# We still don't abort but warn
warn "Something went wrong in a future", error=exc.name
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 isNil(first):
first = err
if not isNil(first):
raise first
return call()
template tryAndWarn*(msg: static[string]; body: untyped): untyped =
try:
body
except CancelledError as ex:
raise ex
except CatchableError as ex:
warn "ignored an error", name=ex.name, msg=msg