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logger.go
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logger.go
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package logger
import (
"os"
"strings"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
// CoreLogger is the core of the package.
// It is based on zap.Logger in the current release;
// but it could be exchanged for a different one in
// future releases.
type CoreLogger struct {
zap.Logger
}
// Logger is where all the logging happens
// A Logger can be a initialised by `NewLogger`.
type Logger struct {
level LogLevel
coreLogger *CoreLogger
fields map[string]interface{}
}
// NewLogger returns a Logger instance.
func NewLogger(level LogLevel, cl *CoreLogger, fields map[string]interface{}) *Logger {
return &Logger{
level: level,
coreLogger: cl,
fields: fields,
}
}
// NewCoreLogger returns a CoreLogger instance.
func NewCoreLogger() *CoreLogger {
encoderConfig := zapcore.EncoderConfig{
MessageKey: "msg",
LevelKey: "level",
TimeKey: "time",
LineEnding: zapcore.DefaultLineEnding,
EncodeLevel: zapcore.LowercaseLevelEncoder,
EncodeTime: zapcore.ISO8601TimeEncoder,
EncodeDuration: zapcore.SecondsDurationEncoder,
EncodeName: zapcore.FullNameEncoder,
}
core := zapcore.NewCore(zapcore.NewJSONEncoder(encoderConfig), zapcore.AddSync(os.Stdout), zapcore.DebugLevel)
cl := CoreLogger{*zap.New(core)}
return &cl
}
// SetField returns a new Logger with the field added
func (l *Logger) SetField(key string, value interface{}) *Logger {
l.fields[key] = value
return l
}
// WithFields returns a new Logger with the fields added
func (l Logger) WithFields(fields map[string]interface{}) FieldLogger {
for k, v := range l.fields {
fields[k] = v
}
return FieldLogger{
inner: l,
fields: fields,
}
}
// Info logs a message at level logger.LogLevelInfo
func (l Logger) Info(msg string) {
if l.level <= LogLevelInfo {
l.coreLogger.Sugar().Infow(msg, mapFieldsToArr(l.fields)...)
}
}
// Error logs a message at level logger.LogLevelInfo
func (l Logger) Error(msg string) {
if l.level <= LogLevelError {
l.coreLogger.Sugar().Errorw(msg, mapFieldsToArr(l.fields)...)
}
}
// Warning logs a message at level logger.LogLevelWarn
func (l Logger) Warning(msg string) {
if l.level <= LogLevelWarn {
l.coreLogger.Sugar().Warnw(msg, mapFieldsToArr(l.fields)...)
}
}
// Debug logs a message at level logger.LogLevelDebug
func (l Logger) Debug(msg string) {
if l.level <= LogLevelDebug {
l.coreLogger.Sugar().Debugw(msg, mapFieldsToArr(l.fields)...)
}
}
// FieldLogger ...
type FieldLogger struct {
inner Logger
fields map[string]interface{}
}
// Info logs a message at level logger.LogLevelInfo
func (l FieldLogger) Info(msg string) {
if l.inner.level <= LogLevelInfo {
l.inner.coreLogger.Sugar().Infow(msg, mapFieldsToArr(l.fields)...)
}
}
// Error logs a message at level logger.LogLevelInfo
func (l FieldLogger) Error(msg string) {
if l.inner.level <= LogLevelError {
l.inner.coreLogger.Sugar().Errorw(msg, mapFieldsToArr(l.fields)...)
}
}
// Warning logs a message at level logger.LogLevelWarn
func (l FieldLogger) Warning(msg string) {
if l.inner.level <= LogLevelWarn {
l.inner.coreLogger.Sugar().Warnw(msg, mapFieldsToArr(l.fields)...)
}
}
// Debug logs a message at level logger.LogLevelDebug
func (l FieldLogger) Debug(msg string) {
if l.inner.level <= LogLevelDebug {
l.inner.coreLogger.Sugar().Debugw(msg, mapFieldsToArr(l.fields)...)
}
}
func mapFieldsToArr(fields map[string]interface{}) []interface{} {
fieldArr := make([]interface{}, (len(fields) * 2))
i := 0
for k, v := range fields {
fieldArr[i] = k
fieldArr[i+1] = v
i += 2
}
return fieldArr
}
// LogLevel ...
type LogLevel int
const (
// LogLevelDebug ...
LogLevelDebug LogLevel = iota
// LogLevelInfo ...
LogLevelInfo
// LogLevelWarn ...
LogLevelWarn
// LogLevelError ...
LogLevelError
)
// String returns the log level as string
func (ll LogLevel) String() string {
return [...]string{"DEBUG", "INFO", "WARN", "ERROR"}[ll]
}
// LogLevelFromStr converts string to LogLevel
func LogLevelFromStr(l string) LogLevel {
levelStr := strings.ToUpper(l)
switch levelStr {
case "DEBUG":
return LogLevelDebug
case "INFO":
return LogLevelInfo
case "WARN":
return LogLevelWarn
case "ERROR":
return LogLevelError
}
return LogLevelInfo
}