nim-libp2p/libp2p/utility.nim

86 lines
2.3 KiB
Nim

# Nim-LibP2P
# Copyright (c) 2023 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 stew/byteutils
template public* {.pragma.}
const
ShortDumpMax = 12
template compilesOr*(a, b: untyped): untyped =
when compiles(a):
a
else:
b
func shortLog*(item: openArray[byte]): string =
if item.len <= ShortDumpMax:
result = item.toHex()
else:
const
split = ShortDumpMax div 2
dumpLen = (ShortDumpMax * 2) + 3
result = newStringOfCap(dumpLen)
result &= item.toOpenArray(0, split - 1).toHex()
result &= "..."
result &= item.toOpenArray(item.len - split, item.high).toHex()
func shortLog*(item: string): string =
if item.len <= ShortDumpMax:
result = item
else:
const
split = ShortDumpMax div 2
dumpLen = ShortDumpMax + 3
result = newStringOfCap(dumpLen)
result &= item[0..<split]
result &= "..."
result &= item[(item.len - split)..item.high]
when defined(libp2p_agents_metrics):
import strutils
export split
import stew/results
export results
proc safeToLowerAscii*(s: string): Result[string, cstring] =
try:
ok(s.toLowerAscii())
except CatchableError:
err("toLowerAscii failed")
const
KnownLibP2PAgents* {.strdefine.} = "nim-libp2p"
KnownLibP2PAgentsSeq* = KnownLibP2PAgents.safeToLowerAscii().tryGet().split(",")
template safeConvert*[T: SomeInteger, S: Ordinal](value: S): T =
## Converts `value` from S to `T` iff `value` is guaranteed to be preserved.
when int64(T.low) <= int64(S.low()) and uint64(T.high) >= uint64(S.high):
T(value)
else:
{.error: "Source and target types have an incompatible range low..high".}
template exceptionToAssert*(body: untyped): untyped =
block:
var res: type(body)
when defined(nimHasWarnBareExcept):
{.push warning[BareExcept]:off.}
try:
res = body
except CatchableError as exc: raise exc
except Defect as exc: raise exc
except Exception as exc: raiseAssert exc.msg
when defined(nimHasWarnBareExcept):
{.pop.}
res