mirror of
https://github.com/42wim/matterbridge.git
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143 lines
3.4 KiB
Go
143 lines
3.4 KiB
Go
// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
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// See LICENSE.txt for license information.
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package mlog
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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"encoding/base64"
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"errors"
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"fmt"
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"io/ioutil"
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"github.com/mattermost/logr"
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"github.com/wiggin77/merror"
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syslog "github.com/wiggin77/srslog"
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)
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// Syslog outputs log records to local or remote syslog.
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type Syslog struct {
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logr.Basic
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w *syslog.Writer
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}
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// SyslogParams provides parameters for dialing a syslog daemon.
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type SyslogParams struct {
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IP string `json:"IP"`
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Port int `json:"Port"`
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Tag string `json:"Tag"`
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TLS bool `json:"TLS"`
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Cert string `json:"Cert"`
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Insecure bool `json:"Insecure"`
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}
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// NewSyslogTarget creates a target capable of outputting log records to remote or local syslog, with or without TLS.
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func NewSyslogTarget(filter logr.Filter, formatter logr.Formatter, params *SyslogParams, maxQueue int) (*Syslog, error) {
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network := "tcp"
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var config *tls.Config
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if params.TLS {
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network = "tcp+tls"
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config = &tls.Config{InsecureSkipVerify: params.Insecure}
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if params.Cert != "" {
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pool, err := getCertPool(params.Cert)
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if err != nil {
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return nil, err
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}
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config.RootCAs = pool
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}
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}
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raddr := fmt.Sprintf("%s:%d", params.IP, params.Port)
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writer, err := syslog.DialWithTLSConfig(network, raddr, syslog.LOG_INFO, params.Tag, config)
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if err != nil {
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return nil, err
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}
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s := &Syslog{w: writer}
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s.Basic.Start(s, s, filter, formatter, maxQueue)
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return s, nil
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}
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// Shutdown stops processing log records after making best effort to flush queue.
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func (s *Syslog) Shutdown(ctx context.Context) error {
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errs := merror.New()
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err := s.Basic.Shutdown(ctx)
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errs.Append(err)
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err = s.w.Close()
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errs.Append(err)
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return errs.ErrorOrNil()
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}
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// getCertPool returns a x509.CertPool containing the cert(s)
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// from `cert`, which can be a path to a .pem or .crt file,
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// or a base64 encoded cert.
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func getCertPool(cert string) (*x509.CertPool, error) {
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if cert == "" {
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return nil, errors.New("no cert provided")
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}
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// first treat as a file and try to read.
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serverCert, err := ioutil.ReadFile(cert)
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if err != nil {
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// maybe it's a base64 encoded cert
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serverCert, err = base64.StdEncoding.DecodeString(cert)
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if err != nil {
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return nil, errors.New("cert cannot be read")
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}
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}
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pool := x509.NewCertPool()
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if ok := pool.AppendCertsFromPEM(serverCert); ok {
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return pool, nil
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}
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return nil, errors.New("cannot parse cert")
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}
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// Write converts the log record to bytes, via the Formatter,
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// and outputs to syslog.
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func (s *Syslog) Write(rec *logr.LogRec) error {
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_, stacktrace := s.IsLevelEnabled(rec.Level())
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buf := rec.Logger().Logr().BorrowBuffer()
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defer rec.Logger().Logr().ReleaseBuffer(buf)
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buf, err := s.Formatter().Format(rec, stacktrace, buf)
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if err != nil {
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return err
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}
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txt := buf.String()
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switch rec.Level() {
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case logr.Panic, logr.Fatal:
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err = s.w.Crit(txt)
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case logr.Error:
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err = s.w.Err(txt)
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case logr.Warn:
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err = s.w.Warning(txt)
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case logr.Debug, logr.Trace:
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err = s.w.Debug(txt)
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default:
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// logr.Info plus all custom levels.
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err = s.w.Info(txt)
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}
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if err != nil {
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reporter := rec.Logger().Logr().ReportError
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reporter(fmt.Errorf("syslog write fail: %w", err))
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// syslog writer will try to reconnect.
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}
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return err
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}
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// String returns a string representation of this target.
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func (s *Syslog) String() string {
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return "SyslogTarget"
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}
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