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sparta_logger.go
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sparta_logger.go
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package sparta
import (
"fmt"
"io"
"os"
"strings"
"time"
"github.com/mattn/go-colorable"
"github.com/pkg/errors"
"github.com/rs/zerolog"
)
const (
colorRed = 31
colorYellow = 33
colorBlue = 34
colorMagenta = 35
colorBold = 1
)
func newRSLogger(logLevel zerolog.Level, outputFormat string, noColor bool) (*zerolog.Logger, error) {
var loggerWriter io.Writer
switch outputFormat {
case "text", "txt":
consoleWriter := zerolog.ConsoleWriter{
Out: colorable.NewColorableStdout(),
TimeFormat: time.RFC822,
}
consoleWriter.FormatLevel = func(i interface{}) string {
var l string
if ll, ok := i.(string); ok {
switch ll {
case "trace":
l = colorize("|TRACE|", colorMagenta, noColor)
case "debug":
l = colorize("|DEBUG|", colorYellow, noColor)
case "info":
l = colorize("|INFO |", colorBlue, noColor)
case "warn":
l = colorize("|WARN |", colorYellow, noColor)
case "error":
l = colorize(colorize("|ERROR|", colorRed, noColor), colorBold, noColor)
case "fatal":
l = colorize(colorize("|FATAL|", colorRed, noColor), colorBold, noColor)
case "panic":
l = colorize(colorize("|PANIC|", colorRed, noColor), colorBold, noColor)
default:
l = colorize("???", colorBold, noColor)
}
} else {
if i == nil {
l = colorize("???", colorBold, noColor)
} else {
l = strings.ToUpper(fmt.Sprintf("%s", i))[0:3]
}
}
return l
}
consoleWriter.FormatMessage = func(i interface{}) string {
// 48 is the same as the dividerLength value
return fmt.Sprintf("%-48s", i)
}
consoleWriter.FormatFieldName = func(i interface{}) string {
return colorize(fmt.Sprintf("%s=", i), colorBold, noColor)
}
consoleWriter.FormatFieldValue = func(i interface{}) string {
return fmt.Sprintf("%s", i)
}
loggerWriter = &consoleWriter
default:
loggerWriter = os.Stdout
}
// Set it up and return it...
rsLogger := zerolog.New(loggerWriter).With().Timestamp().Logger().Level(logLevel)
updateLoggerGlobals()
return &rsLogger, nil
}
// NewLogger returns a new zerolog.Logger instance. It is the caller's responsibility
// to set the formatter if needed.
func NewLogger(level string) (*zerolog.Logger, error) {
return NewLoggerForOutput(level, "", false)
}
// NewLoggerForOutput returns a new zerolog
func NewLoggerForOutput(userLevel string, outputType string, disableColors bool) (*zerolog.Logger, error) {
// If there is an environment override, use that
envLogLevel := os.Getenv(envVarLogLevel)
if envLogLevel != "" {
userLevel = envLogLevel
}
logLevel, err := zerolog.ParseLevel(userLevel)
if err != nil {
return nil, errors.Wrapf(err, "Failed to parse logLevel: %s", userLevel)
}
return newRSLogger(logLevel, outputType, disableColors)
}