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package gobang
import (
"crypto/rand"
"encoding/hex"
"fmt"
"io"
"log/slog"
"math/big"
"os"
"runtime/debug"
"sync"
"syscall"
"time"
)
// FIXME: finish rewriting
//
// lastV7time is the last time we returned stored as:
//
// 52 bits of time in milliseconds since epoch
// 12 bits of (fractional nanoseconds) >> 8
var lastV7Time int64
var timeMu sync.Mutex
// getV7Time returns the time in milliseconds and nanoseconds / 256.
// The returned (milli << (12 + seq)) is guaranteed to be greater than
// (milli << (12 + seq)) returned by any previous call to getV7Time.
// `seq` Sequence number is between 0 and 3906 (nanoPerMilli >> 8)
func getV7Time(nano int64) (int64, int64) {
const nanoPerMilli = 1000 * 1000
milli := nano / nanoPerMilli
seq := (nano - (milli * nanoPerMilli)) >> 8
now := milli << (12 + seq)
timeMu.Lock()
defer timeMu.Unlock()
if now <= lastV7Time {
now = lastV7Time + 1
milli = now >> 12
seq = now & 0xfff
}
lastV7Time = now
return milli, seq
}
const lengthUUID = 16
type UUID struct {
bytes [lengthUUID]byte
}
func NewUUID() UUID {
var buf [lengthUUID]byte
_, err := io.ReadFull(rand.Reader, buf[7:])
if err != nil {
panic(err)
}
buf[6] = (buf[6] & 0x0f) | 0x40 // Version 4
buf[8] = (buf[8] & 0x3f) | 0x80 // Variant is 10
t, s := getV7Time(time.Now().UnixNano())
buf[0] = byte(t >> 40)
buf[1] = byte(t >> 32)
buf[2] = byte(t >> 24)
buf[3] = byte(t >> 16)
buf[4] = byte(t >> 8)
buf[5] = byte(t >> 0)
buf[6] = 0x70 | (0x0f & byte(s >> 8))
buf[7] = byte(s)
return UUID { bytes: buf }
}
func (uuid UUID) ToString() string {
const dashCount = 4
const encodedLength = (lengthUUID * 2) + dashCount
dst := [encodedLength]byte {
0, 0, 0, 0,
0, 0, 0, 0,
'-',
0, 0, 0, 0,
'-',
0, 0, 0, 0,
'-',
0, 0, 0, 0,
'-',
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
}
hex.Encode(dst[ 0:8], uuid.bytes[0:4])
hex.Encode(dst[ 9:13], uuid.bytes[4:6])
hex.Encode(dst[14:18], uuid.bytes[6:8])
hex.Encode(dst[19:23], uuid.bytes[8:10])
hex.Encode(dst[24:36], uuid.bytes[10:])
return string(dst[:])
}
func Debug(message string, type_ string, args ...any) {
slog.Debug(
message,
append(
[]any {
"id", NewUUID().ToString(),
"kind", "log",
"type", type_,
},
args...,
)...,
)
}
func Info(message string, type_ string, args ...any) {
slog.Info(
message,
append(
[]any {
"id", NewUUID().ToString(),
"kind", "log",
"type", type_,
},
args...,
)...,
)
}
func Warning(message string, type_ string, args ...any) {
slog.Warn(
message,
append(
[]any {
"id", NewUUID().ToString(),
"kind", "log",
"type", type_,
},
args...,
)...,
)
}
func Error(message string, type_ string, args ...any) {
slog.Error(
message,
append(
[]any {
"id", NewUUID().ToString(),
"kind", "log",
"type", type_,
},
args...,
)...,
)
}
func Metric(type_ string, label string, args ...any) {
slog.Info(
"_",
append(
[]any {
"id", NewUUID().ToString(),
"kind", "metric",
"type", type_,
"label", label,
},
args...,
)...,
)
}
type Gauge struct {
Inc func(...any)
Dec func(...any)
}
var zero = big.NewInt(0)
var one = big.NewInt(1)
func MakeGauge(label string, staticArgs ...any) Gauge {
count := big.NewInt(0)
emitGauge := func(dynamicArgs ...any) {
if count.Cmp(zero) == -1 {
Error(
"Gauge went negative",
"process-metric",
append(
[]any { "value", count },
append(
staticArgs,
dynamicArgs...,
)...,
)...,
)
return // avoid wrong metrics being emitted
}
Metric(
"gauge", label,
// TODO: we'll have slices.Concat on Go 1.22
append(
[]any { "value", count },
append(
staticArgs,
dynamicArgs...,
)...,
)...,
)
}
return Gauge {
Inc: func(dynamicArgs ...any) {
count.Add(count, one)
emitGauge(dynamicArgs...)
},
Dec: func(dynamicArgs ...any) {
count.Sub(count, one)
emitGauge(dynamicArgs...)
},
}
}
func MakeCounter(label string) func(...any) {
return func(args ...any) {
Metric(
"counter", label,
append([]any { "value", 1 }, args...)...,
)
}
}
func SetLoggerOutput(w io.Writer) {
slog.SetDefault(slog.New(slog.NewJSONHandler(w, &slog.HandlerOptions {
AddSource: true,
})).With(
slog.Group(
"info",
"pid", os.Getpid(),
"ppid", os.Getppid(),
"puuid", NewUUID().ToString(),
),
))
}
func SetTraceback() {
if os.Getenv("GOTRACEBACK") == "" {
debug.SetTraceback("crash")
}
}
func Init() {
SetLoggerOutput(os.Stdout)
SetTraceback()
}
func Fatal(err error) {
Error(
"Fatal error", "fatal-error",
"error", err,
"stack", string(debug.Stack()),
)
syscall.Kill(os.Getpid(), syscall.SIGABRT)
os.Exit(3)
}
func FatalIf(err error) {
if err != nil {
Fatal(err)
}
}
func Main() {
fmt.Println(NewUUID().ToString())
}
|
