Initial logger

Author: bajb

README.md

@@ -1,2 +1,3 @@
 # logger
-Go Logger
+
+Golang Logger

go.mod

@@ -0,0 +1,5 @@
+module github.com/packaged/logger
+
+go 1.16
+
+require go.uber.org/zap v1.19.0 // indirect

google.go

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+package logger
+
+import (
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func WithGoogleEncoding(cfg *zap.Config) {
+	// encoder to match GCP payloads
+	// https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry
+
+	cfg.Encoding = "json"
+	cfg.EncoderConfig = zapcore.EncoderConfig{
+		TimeKey:       "timestamp",
+		LevelKey:      "severity",
+		NameKey:       "logName",
+		CallerKey:     "caller",
+		MessageKey:    "textPayload",
+		StacktraceKey: "trace",
+		LineEnding:    zapcore.DefaultLineEnding,
+		EncodeLevel: func(l zapcore.Level, enc zapcore.PrimitiveArrayEncoder) {
+			switch l {
+			case zapcore.DebugLevel:
+				enc.AppendString("DEBUG")
+			case zapcore.InfoLevel:
+				enc.AppendString("INFO")
+			case zapcore.WarnLevel:
+				enc.AppendString("WARNING")
+			case zapcore.ErrorLevel:
+				enc.AppendString("ERROR")
+			case zapcore.DPanicLevel:
+				enc.AppendString("CRITICAL")
+			case zapcore.PanicLevel:
+				enc.AppendString("ALERT")
+			case zapcore.FatalLevel:
+				enc.AppendString("EMERGENCY")
+			}
+		},
+		EncodeTime:     zapcore.ISO8601TimeEncoder,
+		EncodeDuration: zapcore.SecondsDurationEncoder,
+		EncodeCaller:   zapcore.ShortCallerEncoder,
+	}
+}

logger.go

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+package logger
+
+import (
+	"go.uber.org/zap"
+	"log"
+)
+
+func Instance(options ...Option) *zap.Logger {
+	return InstanceWithConfig(zap.NewProductionConfig(), options...)
+}
+func DevelopmentInstance(options ...Option) *zap.Logger {
+	return InstanceWithConfig(zap.NewDevelopmentConfig(), options...)
+}
+
+func InstanceWithConfig(cfg zap.Config, options ...Option) *zap.Logger {
+	// Configure with options
+	for _, opt := range options {
+		opt(&cfg)
+	}
+
+	logger, err := cfg.Build()
+	if err != nil {
+		log.Println("Unable to create logger", err)
+	}
+	return logger
+
+}

options.go

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+package logger
+
+import "go.uber.org/zap"
+
+type Option func(config *zap.Config)
+
+func Debug(config *zap.Config)  { config.Level = zap.NewAtomicLevelAt(zap.DebugLevel) }
+func Info(config *zap.Config)   { config.Level = zap.NewAtomicLevelAt(zap.InfoLevel) }
+func Warn(config *zap.Config)   { config.Level = zap.NewAtomicLevelAt(zap.WarnLevel) }
+func Error(config *zap.Config)  { config.Level = zap.NewAtomicLevelAt(zap.ErrorLevel) }
+func DPanic(config *zap.Config) { config.Level = zap.NewAtomicLevelAt(zap.DPanicLevel) }
+func Panic(config *zap.Config)  { config.Level = zap.NewAtomicLevelAt(zap.PanicLevel) }
+func Fatal(config *zap.Config)  { config.Level = zap.NewAtomicLevelAt(zap.FatalLevel) }
+
+func WithConsoleEncoding(config *zap.Config) {
+	config.Encoding = "console"
+	config.EncoderConfig = zap.NewDevelopmentEncoderConfig()
+}