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package logging
import (
"encoding/json"
"fmt"
"log/syslog"
"strings"
"github.com/lxc/incus/v6/internal/server/state"
"github.com/lxc/incus/v6/shared/api"
)
var facilityMap = map[string]syslog.Priority{
"kern": syslog.LOG_KERN,
"user": syslog.LOG_USER,
"mail": syslog.LOG_MAIL,
"daemon": syslog.LOG_DAEMON,
"auth": syslog.LOG_AUTH,
"syslog": syslog.LOG_SYSLOG,
"lpr": syslog.LOG_LPR,
"news": syslog.LOG_NEWS,
"uucp": syslog.LOG_UUCP,
"cron": syslog.LOG_CRON,
"authpriv": syslog.LOG_AUTHPRIV,
"ftp": syslog.LOG_FTP,
}
// SyslogLogger represents a syslog logger.
type SyslogLogger struct {
common
address string
facility syslog.Priority
network string
tag string
writer *syslog.Writer
}
// NewSyslogLogger instantiates a new syslog logger.
func NewSyslogLogger(s *state.State, name string) (*SyslogLogger, error) {
addr, facility := s.GlobalConfig.LoggingConfigForSyslog(name)
network, address := parseAddress(addr)
return &SyslogLogger{
common: newCommonLogger(name, s.GlobalConfig),
address: address,
facility: parseFacility(facility),
network: network,
tag: "incus",
}, nil
}
func (c *SyslogLogger) write(event api.Event) error {
msg := fmt.Sprintf("type: %s log: %s", event.Type, string(event.Metadata))
lvl := "info"
if event.Type == api.EventTypeLogging {
logEvent := api.EventLogging{}
err := json.Unmarshal(event.Metadata, &logEvent)
if err != nil {
return err
}
lvl = logEvent.Level
}
switch strings.ToLower(lvl) {
case "panic":
return c.writer.Err(msg)
case "fatal":
return c.writer.Err(msg)
case "error":
return c.writer.Err(msg)
case "warn", "warning":
return c.writer.Warning(msg)
case "trace":
return c.writer.Warning(msg)
case "info":
return c.writer.Info(msg)
case "debug":
return c.writer.Debug(msg)
}
return nil
}
// HandleEvent handles the event received from the internal event listener.
func (c *SyslogLogger) HandleEvent(event api.Event) {
if !c.processEvent(event) {
return
}
_ = c.write(event)
}
// Start starts the syslog logger.
func (c *SyslogLogger) Start() error {
writer, err := syslog.Dial(c.network, c.address, c.facility, c.tag)
if err != nil {
return err
}
c.writer = writer
return nil
}
// Stop cleans up the syslog logger.
func (c *SyslogLogger) Stop() {
if c.writer != nil {
_ = c.writer.Close()
}
}
// Validate checks whether the logger configuration is correct.
func (c *SyslogLogger) Validate() error {
if c.address == "" {
return fmt.Errorf("%s: Address cannot be empty", c.name)
}
return nil
}
// parseAddress parses a syslog address into two parts: protocol and the address itself.
func parseAddress(address string) (string, string) {
protocol := "udp"
port := "514"
if strings.Contains(address, "://") {
parts := strings.SplitN(address, "://", 2)
protocol = parts[0]
address = parts[1]
}
if !strings.Contains(address, ":") {
address = fmt.Sprintf("%s:%s", address, port)
}
return protocol, address
}
// parseFacility parses a string into a syslog.Priority.
func parseFacility(facility string) syslog.Priority {
facility = strings.ToLower(strings.TrimSpace(facility))
val, ok := facilityMap[facility]
if ok {
return val
}
return syslog.LOG_DAEMON
}
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