first commit

logging/clf.go

@@ -0,0 +1,77 @@
+package logging
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+	"time"
+
+	"github.com/sirupsen/logrus"
+)
+
+var clfFields = [...]string{
+	"request-id", "remote-address", "name", "user-id", "time", "duration", "method", "path", "protocol", "status", "size",
+}
+
+// CommonLogFormat implements the logrus.Formatter interface it writes logrus
+// entries using a CLF format prepended by the request-id.
+type CommonLogFormat struct{}
+
+// Format implements the logrus.Formatter interface. It returns the given
+// logrus entry as a CLF line with the following format:
+// 	<request-id> <remote-address> <name> <user-id> <time> <duration> "<method> <path> <protocol>" <status> <size>
+// If a field is not known, the hyphen symbol (-) will be used.
+func (f *CommonLogFormat) Format(entry *logrus.Entry) ([]byte, error) {
+	data := make([]string, len(clfFields))
+	for i, name := range clfFields {
+		if v, ok := entry.Data[name]; ok {
+			switch v := v.(type) {
+			case error:
+				data[i] = v.Error()
+			case string:
+				if v == "" {
+					data[i] = "-"
+				} else {
+					data[i] = v
+				}
+			case time.Time:
+				data[i] = v.Format(time.RFC3339)
+			case time.Duration:
+				data[i] = strconv.FormatInt(int64(v/time.Millisecond), 10)
+			case int:
+				data[i] = strconv.FormatInt(int64(v), 10)
+			case int64:
+				data[i] = strconv.FormatInt(v, 10)
+			default:
+				data[i] = fmt.Sprintf("%v", v)
+			}
+		} else {
+			data[i] = "-"
+		}
+	}
+
+	var buf bytes.Buffer
+	buf.WriteString(data[0])
+	buf.WriteByte(' ')
+	buf.WriteString(data[1])
+	buf.WriteByte(' ')
+	buf.WriteString(data[2])
+	buf.WriteByte(' ')
+	buf.WriteString(data[3])
+	buf.WriteByte(' ')
+	buf.WriteString(data[4])
+	buf.WriteByte(' ')
+	buf.WriteString(data[5])
+	buf.WriteString(" \"")
+	buf.WriteString(data[6])
+	buf.WriteByte(' ')
+	buf.WriteString(data[7])
+	buf.WriteByte(' ')
+	buf.WriteString(data[8])
+	buf.WriteString("\" ")
+	buf.WriteString(data[9])
+	buf.WriteByte(' ')
+	buf.WriteString(data[10])
+	buf.WriteByte('\n')
+	return buf.Bytes(), nil
+}