Update logrus vendor

closes #2125

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

vendor/github.com/bshuster-repo/logrus-logstash-hook/logstash_formatter.go

@@ -0,0 +1,81 @@
+package logrus_logstash
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+
+	"github.com/Sirupsen/logrus"
+)
+
+// Formatter generates json in logstash format.
+// Logstash site: http://logstash.net/
+type LogstashFormatter struct {
+	Type string // if not empty use for logstash type field.
+
+	// TimestampFormat sets the format used for timestamps.
+	TimestampFormat string
+}
+
+func (f *LogstashFormatter) Format(entry *logrus.Entry) ([]byte, error) {
+	return f.FormatWithPrefix(entry, "")
+}
+
+func (f *LogstashFormatter) FormatWithPrefix(entry *logrus.Entry, prefix string) ([]byte, error) {
+	fields := make(logrus.Fields)
+	for k, v := range entry.Data {
+		//remvove the prefix when sending the fields to logstash
+		if prefix != "" && strings.HasPrefix(k, prefix) {
+			k = strings.TrimPrefix(k, prefix)
+		}
+
+		switch v := v.(type) {
+		case error:
+			// Otherwise errors are ignored by `encoding/json`
+			// https://github.com/Sirupsen/logrus/issues/377
+			fields[k] = v.Error()
+		default:
+			fields[k] = v
+		}
+	}
+
+	fields["@version"] = "1"
+
+	timeStampFormat := f.TimestampFormat
+
+	if timeStampFormat == "" {
+		//timeStampFormat = logrus.DefaultTimestampFormat
+		timeStampFormat = "2006-01-02 15:04:05.000"
+	}
+
+	fields["@timestamp"] = entry.Time.Format(timeStampFormat)
+
+	// set message field
+	v, ok := entry.Data["message"]
+	if ok {
+		fields["fields.message"] = v
+	}
+	fields["message"] = entry.Message
+
+	// set level field
+	v, ok = entry.Data["level"]
+	if ok {
+		fields["fields.level"] = v
+	}
+	fields["level"] = entry.Level.String()
+
+	// set type field
+	if f.Type != "" {
+		v, ok = entry.Data["type"]
+		if ok {
+			fields["fields.type"] = v
+		}
+		fields["type"] = f.Type
+	}
+
+	serialized, err := json.Marshal(fields)
+	if err != nil {
+		return nil, fmt.Errorf("Failed to marshal fields to JSON, %v", err)
+	}
+	return append(serialized, '\n'), nil
+}