/
worker.go
149 lines (125 loc) · 3.18 KB
/
worker.go
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// Copyright 2022 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package syslogger
import (
"fmt"
"io"
"time"
"github.com/juju/errors"
"github.com/juju/loggo"
"github.com/juju/names/v5"
"github.com/juju/worker/v3"
"github.com/juju/worker/v3/catacomb"
corelogger "github.com/juju/juju/core/logger"
)
// NewLogger is a factory function to create a new syslog logger.
type NewLogger func(Priority, string) (io.WriteCloser, error)
// WorkerConfig encapsulates the configuration options for the
// dbaccessor worker.
type WorkerConfig struct {
NewLogger NewLogger
}
// Validate ensures that the config values are valid.
func (c *WorkerConfig) Validate() error {
if c.NewLogger == nil {
return errors.NotValidf("nil NewLogger")
}
return nil
}
type Priority int
const (
// Severity.
// From /usr/include/sys/syslog.h.
// These are the same on Linux, BSD, and OS X.
LOG_EMERG Priority = iota
LOG_ALERT
LOG_CRIT
LOG_ERR
LOG_WARNING
LOG_NOTICE
LOG_INFO
LOG_DEBUG
)
// SysLogger defines an interface for logging log records.
type SysLogger interface {
Log([]corelogger.LogRecord) error
}
type syslogWorker struct {
cfg WorkerConfig
catacomb catacomb.Catacomb
writers map[loggo.Level]io.WriteCloser
}
var syslogLoggoLevels = map[loggo.Level]Priority{
loggo.CRITICAL: LOG_CRIT,
loggo.ERROR: LOG_ERR,
loggo.WARNING: LOG_WARNING,
loggo.INFO: LOG_INFO,
loggo.DEBUG: LOG_DEBUG,
loggo.TRACE: LOG_DEBUG, // syslog has not trace level.
loggo.UNSPECIFIED: LOG_DEBUG,
}
func NewWorker(cfg WorkerConfig) (worker.Worker, error) {
var err error
if err = cfg.Validate(); err != nil {
return nil, errors.Trace(err)
}
// Create a writer for every log level, so we can stream line the logging
// process.
writers := make(map[loggo.Level]io.WriteCloser)
for level, priority := range syslogLoggoLevels {
writer, err := cfg.NewLogger(priority, "juju.daemon")
if err != nil {
return nil, errors.Trace(err)
}
writers[level] = writer
}
w := &syslogWorker{
cfg: cfg,
writers: writers,
}
if err = catacomb.Invoke(catacomb.Plan{
Site: &w.catacomb,
Work: func() error {
<-w.catacomb.Dying()
w.close()
return nil
},
}); err != nil {
return nil, errors.Trace(err)
}
return w, nil
}
// Kill is part of the worker.Worker interface.
func (w *syslogWorker) Kill() {
w.catacomb.Kill(nil)
}
// Wait is part of the worker.Worker interface.
func (w *syslogWorker) Wait() error {
return w.catacomb.Wait()
}
func (w *syslogWorker) Log(logs []corelogger.LogRecord) error {
// Prevent logging out if the worker has already been killed.
select {
case <-w.catacomb.Dead():
return w.catacomb.Err()
default:
}
for _, log := range logs {
writer, ok := w.writers[log.Level]
if !ok {
continue
}
module := log.Module
if names.IsValidModel(log.ModelUUID) {
module = fmt.Sprintf("%s.%s", log.Module, names.NewModelTag(log.ModelUUID).ShortId())
}
dateTime := log.Time.In(time.UTC).Format("2006-01-02 15:04:05")
_, _ = fmt.Fprintf(writer, "%s %s %s %s\n", dateTime, log.Entity, module, log.Message)
}
return nil
}
func (w *syslogWorker) close() {
for _, writer := range w.writers {
_ = writer.Close()
}
}