a879973081
* First work on better timezones * Update tests to new api. Removed tests for checking that `isDst` was included when formatting, since `isDst` no longer affects utc offset (the entire utc offset is stored directly in `utcOffset` instead). * Deprecate getLocaltime & getGmTime * Add `now()` as a shorthand for GetTIme().inZone(Local) * Add FedericoCeratto's timezone tests (#6548) * Run more tests in all timezones * Make month enum start at 1 instead of 0 * Deprecate getDayOfWeekJulian * Fix issues with gc safety * Rename TimeInfo => DateTime * Fixes #6465 * Improve isLeapYear * FIx handling negative adjTime * Cleanup: - deprecated toSeconds and fromSeconds, added fromUnix and toUnix instead (that returns int64 instead of float) - added missing doc comments - removed some unnecessary JS specific implementations * Fix misstake in JS `-` for Time * Update usage of TimeEffect * Removed unecessary use of `difftime` * JS fix for local tz * Fix subtraction of months * Fix `days` field in `toTimeInterval` * Style and docs * Fix getDayOfYear for real this time... * Fix handling of adding/subtracting time across dst transitions * Fix some bad usage of the times module in the stdlib * Revert to use proper time resoultion for seeding in random.nim * Move deprecated procs to bottom of file * Always use `epochTime` in `randomize` * Remove TimeInterval normalization * Fixes #6905 * Fix getDayOfWeek for year < 1 * Export toEpochDay/fromEpochDay and change year/month/monthday order * Add asserts for checking that the monthday is valid * Fix some remaining ambiguous references to `Time` * Fix ambiguous reference to Time
95 lines
2.5 KiB
Nim
95 lines
2.5 KiB
Nim
#
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#
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# Nim's Runtime Library
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# (c) Copyright 2013 Andreas Rumpf
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#
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# See the file "copying.txt", included in this
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# distribution, for details about the copyright.
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#
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## Nim OID support. An OID is a global ID that consists of a timestamp,
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## a unique counter and a random value. This combination should suffice to
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## produce a globally distributed unique ID. This implementation was extracted
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## from the Mongodb interface and it thus binary compatible with a Mongo OID.
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##
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## This implementation calls ``math.randomize()`` for the first call of
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## ``genOid``.
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import times, endians
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type
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Oid* = object ## an OID
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time: int32 ##
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fuzz: int32 ##
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count: int32 ##
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{.deprecated: [Toid: Oid].}
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proc `==`*(oid1: Oid, oid2: Oid): bool =
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## Compare two Mongo Object IDs for equality
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return (oid1.time == oid2.time) and (oid1.fuzz == oid2.fuzz) and (oid1.count == oid2.count)
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proc hexbyte*(hex: char): int =
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case hex
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of '0'..'9': result = (ord(hex) - ord('0'))
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of 'a'..'f': result = (ord(hex) - ord('a') + 10)
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of 'A'..'F': result = (ord(hex) - ord('A') + 10)
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else: discard
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proc parseOid*(str: cstring): Oid =
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## parses an OID.
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var bytes = cast[cstring](addr(result.time))
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var i = 0
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while i < 12:
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bytes[i] = chr((hexbyte(str[2 * i]) shl 4) or hexbyte(str[2 * i + 1]))
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inc(i)
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proc oidToString*(oid: Oid, str: cstring) =
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const hex = "0123456789abcdef"
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# work around a compiler bug:
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var str = str
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var o = oid
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var bytes = cast[cstring](addr(o))
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var i = 0
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while i < 12:
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let b = bytes[i].ord
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str[2 * i] = hex[(b and 0xF0) shr 4]
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str[2 * i + 1] = hex[b and 0xF]
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inc(i)
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str[24] = '\0'
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proc `$`*(oid: Oid): string =
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result = newString(24)
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oidToString(oid, result)
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var
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incr: int
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fuzz: int32
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proc genOid*(): Oid =
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## generates a new OID.
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proc rand(): cint {.importc: "rand", header: "<stdlib.h>", nodecl.}
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proc srand(seed: cint) {.importc: "srand", header: "<stdlib.h>", nodecl.}
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var t = getTime().int32
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var i = int32(atomicInc(incr))
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if fuzz == 0:
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# racy, but fine semantically:
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srand(t)
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fuzz = rand()
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bigEndian32(addr result.time, addr(t))
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result.fuzz = fuzz
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bigEndian32(addr result.count, addr(i))
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proc generatedTime*(oid: Oid): Time =
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## returns the generated timestamp of the OID.
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var tmp: int32
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var dummy = oid.time
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bigEndian32(addr(tmp), addr(dummy))
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result = fromUnix(tmp)
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when not defined(testing) and isMainModule:
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let xo = genOid()
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echo xo.generatedTime
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