139 lines
3.9 KiB
Nim
139 lines
3.9 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 std/options, std/macros
|
|
import stew/[byteutils, results]
|
|
|
|
export results
|
|
|
|
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
|
|
|
|
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".}
|
|
|
|
proc capLen*[T](s: var seq[T], length: Natural) =
|
|
if s.len > length:
|
|
s.setLen(length)
|
|
|
|
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
|
|
|
|
template withValue*[T](self: Opt[T] | Option[T], value, body: untyped): untyped =
|
|
## This template provides a convenient way to work with `Option` types in Nim.
|
|
## It allows you to execute a block of code (`body`) only when the `Option` is not empty.
|
|
##
|
|
## `self` is the `Option` instance being checked.
|
|
## `value` is the variable name to be used within the `body` for the unwrapped value.
|
|
## `body` is a block of code that is executed only if `self` contains a value.
|
|
##
|
|
## The `value` within `body` is automatically unwrapped from the `Option`, making it
|
|
## simpler to work with without needing explicit checks or unwrapping.
|
|
##
|
|
## Example:
|
|
## ```nim
|
|
## let myOpt = Opt.some(5)
|
|
## myOpt.withValue(value):
|
|
## echo value # Will print 5
|
|
## ```
|
|
##
|
|
## Note: This is a template, and it will be inlined at the call site, offering good performance.
|
|
let temp = (self)
|
|
if temp.isSome:
|
|
let value {.inject.} = temp.get()
|
|
body
|
|
|
|
macro withValue*[T](self: Opt[T] | Option[T], value, body, elseStmt: untyped): untyped =
|
|
let elseBody = elseStmt[0]
|
|
quote do:
|
|
let temp = (`self`)
|
|
if temp.isSome:
|
|
let `value` {.inject.} = temp.get()
|
|
`body`
|
|
else:
|
|
`elseBody`
|
|
|
|
template valueOr*[T](self: Option[T], body: untyped): untyped =
|
|
let temp = (self)
|
|
if temp.isSome:
|
|
temp.get()
|
|
else:
|
|
body
|
|
|
|
template toOpt*[T, E](self: Result[T, E]): Opt[T] =
|
|
let temp = (self)
|
|
if temp.isOk:
|
|
when T is void: Result[void, void].ok()
|
|
else: Opt.some(temp.unsafeGet())
|
|
else:
|
|
Opt.none(type(T))
|