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// Copyright (C) 2017-2018 Luke Shumaker <lukeshu@sbcglobal.net>
//
// 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 nslcd_server
import (
"context"
"git.lukeshu.com/go/libsystemd/sd_daemon"
"golang.org/x/sys/unix"
)
// Logger is the common interface between
// "git.lukeshu.com/go/libsystemd/sd_daemon".Logger and
// "log/syslog".Writer.
type Logger interface {
Emerg(m string) error
Alert(m string) error
Crit(m string) error
Err(m string) error
Warning(m string) error
Notice(m string) error
Info(m string) error
Debug(m string) error
Write(m []byte) (int, error)
}
// contextKey is a value for use with context.WithValue. It's used as
// a pointer so it fits in an interface{} without allocation.
type contextKey struct {
name string
}
var (
// PeerCredKey is a context key. It can be used in backend
// methods to access the credentials of the client process.
// The associated value will be of type
// "golang.org/x/sys/unix".Ucred
PeerCredKey = &contextKey{"peercred"}
// LoggerKey is a context key. It can be used in the backend
// methods to access a logger. The associated value will be
// an implementation of Logger.
LoggerKey = &contextKey{"log"}
)
// PeerCredFromContext is a convenience function for
//
// cred, ok := ctx.Value(nslcd_server.PeerCredKey).(unix.Ucred)
func PeerCredFromContext(ctx context.Context) (unix.Ucred, bool) {
cred, ok := ctx.Value(PeerCredKey).(unix.Ucred)
return cred, ok
}
// LoggerFromcontext returns the value associated with LoggerKey, or
// an Stderr logger if there is no value associated with LoggerKey.
func LoggerFromContext(ctx context.Context) Logger {
logger, ok := ctx.Value(LoggerKey).(Logger)
if !ok {
return sd_daemon.Log
}
return logger
}
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