Add logging

internal/logger/zap.go

@@ -0,0 +1,32 @@
+package logger
+
+import (
+	"os"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func New() (*zap.Logger, error) {
+	highPriority := zap.LevelEnablerFunc(func(lvl zapcore.Level) bool {
+		return lvl >= zapcore.ErrorLevel
+	})
+	lowPriority := zap.LevelEnablerFunc(func(lvl zapcore.Level) bool {
+		return lvl < zapcore.ErrorLevel
+	})
+
+	config := zap.NewDevelopmentEncoderConfig()
+	config.EncodeTime = nil
+	config.EncodeLevel = zapcore.CapitalColorLevelEncoder
+	consoleEncoder := zapcore.NewConsoleEncoder(config)
+	consoleDebugging := zapcore.Lock(os.Stdout)
+	consoleErrors := zapcore.Lock(os.Stderr)
+
+	core := zapcore.NewTee(
+		zapcore.NewCore(consoleEncoder, consoleErrors, highPriority),
+		zapcore.NewCore(consoleEncoder, consoleDebugging, lowPriority),
+	)
+
+	logger := zap.New(core)
+	return logger, nil
+}