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package logger
import (
"hash/fnv"
"strings"
"time"
"github.com/fatih/color"
"go.uber.org/zap/zapcore"
)
var colorMap = []func(string, ...interface{}) string{
color.HiYellowString,
color.HiGreenString,
color.HiBlueString,
color.HiRedString,
color.HiCyanString,
color.HiMagentaString,
}
// ColoredLevelEncoder colorizes log levels.
func ColoredLevelEncoder(level zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
switch level {
case zapcore.DebugLevel:
enc.AppendString(color.HiWhiteString(level.CapitalString()))
case zapcore.InfoLevel:
enc.AppendString(color.HiCyanString(level.CapitalString()))
case zapcore.WarnLevel:
enc.AppendString(color.HiYellowString(level.CapitalString()))
case zapcore.ErrorLevel, zapcore.DPanicLevel:
enc.AppendString(color.HiRedString(level.CapitalString()))
case zapcore.PanicLevel, zapcore.FatalLevel:
enc.AppendString(color.HiMagentaString(level.CapitalString()))
}
}
// ColoredNameEncoder colorizes service names.
func ColoredNameEncoder(s string, enc zapcore.PrimitiveArrayEncoder) {
if len(s) < 12 {
s += strings.Repeat(" ", 12-len(s))
}
enc.AppendString(color.HiGreenString(s))
}
// ColoredHashedNameEncoder colorizes service names and assigns different colors to different names.
func ColoredHashedNameEncoder(s string, enc zapcore.PrimitiveArrayEncoder) {
if len(s) < 12 {
s += strings.Repeat(" ", 12-len(s))
}
colorID := stringHash(s, len(colorMap))
enc.AppendString(colorMap[colorID](s))
}
// UTCTimeEncoder encodes time into short UTC specific timestamp.
func UTCTimeEncoder(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
enc.AppendString(t.UTC().Format("2006/01/02 15:04:05"))
}
// returns string hash
func stringHash(name string, base int) int {
h := fnv.New32a()
h.Write([]byte(name))
return int(h.Sum32()) % base
}
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