first (BIG) commit

logger/logger.go

@@ -0,0 +1,60 @@
+// Package logger implements a simple helper for displaying outputs to the user.
+package logger
+
+import (
+	"os"
+
+	"github.com/sirupsen/logrus"
+)
+
+// newLogger instantiates a logrus logger.
+func newLogger() *logrus.Logger {
+	l := logrus.New()
+	l.Out = os.Stdout
+	l.Level = logrus.InfoLevel
+
+	return l
+}
+
+// Log is the logger instance used accross the application.
+var Log = newLogger()
+
+// logLevels associates log levels from the configuration file with its equivalent
+// in the logrus library.
+var logLevels = map[string]logrus.Level{
+	"DEBUG": logrus.DebugLevel,
+	"INFO":  logrus.InfoLevel,
+	"WARN":  logrus.WarnLevel,
+	"ERROR": logrus.ErrorLevel,
+	"FATAL": logrus.FatalLevel,
+	"PANIC": logrus.PanicLevel,
+}
+
+// SetLevel changes our logger's log level according to
+// the log level defined in the configuration file.
+func SetLevel(logLevel string) {
+	lvl, ok := logLevels[logLevel]
+	if ok {
+		Log.Level = lvl
+	}
+}
+
+func InfoR(transactionID string, msg string) {
+	Log.WithFields(logrus.Fields{
+		"transaction": transactionID,
+	}).Info(msg)
+}
+
+func WarnR(transactionID string, msg string) {
+	Log.WithFields(logrus.Fields{
+		"transaction": transactionID,
+	}).Warn(msg)
+}
+
+func ErrorR(transactionID string, err error, code int, msg string) {
+	Log.WithFields(logrus.Fields{
+		"transaction": transactionID,
+		"code":        code,
+		"err":         err.Error(),
+	}).Error(msg)
+}