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logrus.go
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logrus.go
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/*
* skogul, logrus receiver
*
* Copyright (c) 2019 Telenor Norge AS
* Author(s):
* - Håkon Solbjørg <hakon.solbjorg@telenor.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
package receiver
import (
"encoding/json"
"fmt"
"io"
"os"
"time"
"github.com/sirupsen/logrus"
"github.com/telenornms/skogul"
)
// LogrusLog configures the logrus log receiver
type LogrusLog struct {
Loglevel string
Handler skogul.HandlerRef
}
var logrusLogLogger = logrus.New()
var logMetadataFields *[]string
func (lg *LogrusLog) configureLogger() error {
// Set up internal logger so we don't cause recursive logging in case we log errors
logrusLogLogger.SetOutput(io.Writer(os.Stdout))
logrusLogLogger.WithFields(logrus.Fields{
"category": "receiver",
"receiver": "logrus",
})
loglevel := skogul.GetLogLevelFromString(lg.Loglevel)
logrusLogLogger.SetLevel(loglevel)
metadataFields := []string{"category", "level"}
a := make([]string, 0)
logMetadataFields = &a
for _, field := range metadataFields {
*logMetadataFields = append(*logMetadataFields, field)
}
return nil
}
// Write logrus logs as skogul.Containers to a handler
func (lg *LogrusLog) Write(bytes []byte) (int, error) {
metadata := make(map[string]interface{})
var data map[string]interface{}
if err := json.Unmarshal(bytes, &data); err != nil {
logrusLogLogger.Error("Failed to unmarshal logrus log for sending it to log receiver")
return 0, err
}
// Extract metadata fields from data
for _, field := range *logMetadataFields {
metadata[field] = data[field]
}
timestampData := data["time"].(string)
timestamp, err := time.Parse(time.RFC3339, timestampData)
if err != nil {
// @ToDo: Do we want to error out if this fails?
logrusLogLogger.Errorf("Failed to parse timestamp '%s' '%s'\n", "time", timestampData)
}
m := skogul.Metric{
Time: ×tamp,
Metadata: metadata,
Data: data,
}
c := skogul.Container{
Metrics: []*skogul.Metric{&m},
}
lg.Handler.H.TransformAndSend(&c)
return len(bytes), nil
}
// Start initializes the logger and sets up required facilities
func (lg *LogrusLog) Start() error {
logrusLogLogger.Debug("Starting logger")
lg.configureLogger()
h := LogrusSkogulHook{
Writer: lg,
}
logrus.AddHook(&h)
return nil
}
// LogrusSkogulHook is a logrus.Hook made for skogul
type LogrusSkogulHook struct {
Writer *LogrusLog
A string
}
// Fire implements the logrus.Hook interface and handles each log entry
func (hook *LogrusSkogulHook) Fire(entry *logrus.Entry) error {
entr := entry.Data
entr["message"] = entry.Message
entr["time"] = entry.Time
entr["level"] = entry.Level
data, err := json.Marshal(entr)
if err != nil {
fmt.Println("Failed to convert log entry to json")
return err
}
_, err = (*hook.Writer).Write([]byte(data))
if err != nil {
fmt.Println("Write to handler failed", err)
return err
}
return nil
}
// Levels returns the log levels the hook should care about
func (hook *LogrusSkogulHook) Levels() []logrus.Level {
return logrus.AllLevels
}