Implemented logger, write to file on disk

logger/logger.go

@@ -0,0 +1,110 @@
+package logger
+
+import (
+	"github.com/sirupsen/logrus"
+	"os"
+	"time"
+)
+
+// Event stores messages to log later, from our standard interface
+type Event struct {
+	id      int
+	message string
+}
+
+// ApplicationLogger enforces specific log message formats
+type ApplicationLogger struct {
+	*logrus.Logger
+}
+
+// NewLogger initializes the standard logger
+func InitLogger() *ApplicationLogger {
+	var baseLogger = logrus.New()
+	var applicationLogger = &ApplicationLogger{baseLogger}
+
+	f, _ := os.OpenFile("/var/log/planetposen_logs/planetposen-images.log", os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
+
+	applicationLogger.SetOutput(f)
+	applicationLogger.Formatter = &logrus.JSONFormatter{
+		TimestampFormat: time.RFC3339Nano,
+		FieldMap: logrus.FieldMap{
+			logrus.FieldKeyMsg:  "message",
+			logrus.FieldKeyTime: "@timestamp",
+		},
+	}
+
+	return applicationLogger
+}
+
+// Declare variables to store log messages as new Events
+var (
+	infoMessage            = Event{1, "%s"}
+	invalidArgMessage      = Event{2, "Invalid arg: %s"}
+	invalidArgValueMessage = Event{3, "Invalid value for argument: %s: %v"}
+	missingArgMessage      = Event{4, "Missing arg: %s"}
+)
+
+func (l *ApplicationLogger) Info(argumentName string) {
+	l.WithFields(logrus.Fields{
+		"application": "planetposen-images",
+	}).Infof(infoMessage.message, argumentName)
+}
+
+func (l *ApplicationLogger) InfoWithPath(message string, path string) {
+	l.WithFields(logrus.Fields{
+		"application": "planetposen-images",
+		"path":        path,
+	}).Info(message)
+}
+
+func (l *ApplicationLogger) InfoWithFilename(message string, filename string) {
+	l.WithFields(logrus.Fields{
+		"application": "planetposen-images",
+		"filename":    filename,
+	}).Info(message)
+}
+
+func (l *ApplicationLogger) UploadSuccessMessage(path string, url string) {
+	l.WithFields(logrus.Fields{
+		"application": "planetposen-images",
+		"path":        path,
+		"url":         url,
+	}).Info("Uploaded and available")
+}
+
+func (l *ApplicationLogger) Error(message string, error error) {
+	l.WithFields(logrus.Fields{
+		"application": "planetposen-images",
+		"err":         error,
+	}).Error(message)
+}
+
+func (l *ApplicationLogger) Fatal(error error) {
+	l.WithFields(logrus.Fields{
+		"application": "planetposen-images",
+		"err":         error,
+	}).Fatal("Fatal application exception!")
+}
+
+func (l *ApplicationLogger) GoogleApiError(message string, error error) {
+	l.WithFields(logrus.Fields{
+		"application": "planetposen-images",
+		"go_package":  "cloud.google.com/go/storage",
+		"err":         error,
+	}).Error(message)
+}
+
+// InvalidArg is a standard error message
+func (l *ApplicationLogger) InvalidArg(argumentName string) {
+	l.Errorf(invalidArgMessage.message, argumentName)
+}
+
+// InvalidArgValue is a standard error message
+func (l *ApplicationLogger) InvalidArgValue(argumentName string, argumentValue string) {
+	l.Errorf(invalidArgValueMessage.message, argumentName, argumentValue)
+}
+
+// MissingArg is a standard error message
+func (l *ApplicationLogger) MissingArg(argumentName string) {
+	l.Errorf(missingArgMessage.message, argumentName)
+}