github.com/projectatomic/docker@v1.8.2/daemon/logger/journald/journald.go (about)

     1  // +build linux
     2  
     3  package journald
     4  
     5  import (
     6  	"fmt"
     7  
     8  	"github.com/Sirupsen/logrus"
     9  	"github.com/coreos/go-systemd/journal"
    10  	"github.com/docker/docker/daemon/logger"
    11  )
    12  
    13  const name = "journald"
    14  
    15  type Journald struct {
    16  	Jmap map[string]string
    17  }
    18  
    19  func init() {
    20  	if err := logger.RegisterLogDriver(name, New); err != nil {
    21  		logrus.Fatal(err)
    22  	}
    23  }
    24  
    25  func New(ctx logger.Context) (logger.Logger, error) {
    26  	if !journal.Enabled() {
    27  		return nil, fmt.Errorf("journald is not enabled on this host")
    28  	}
    29  	// Strip a leading slash so that people can search for
    30  	// CONTAINER_NAME=foo rather than CONTAINER_NAME=/foo.
    31  	name := ctx.ContainerName
    32  	if name[0] == '/' {
    33  		name = name[1:]
    34  	}
    35  	jmap := map[string]string{
    36  		"CONTAINER_ID":      ctx.ContainerID[:12],
    37  		"CONTAINER_ID_FULL": ctx.ContainerID,
    38  		"CONTAINER_NAME":    name}
    39  	return &Journald{Jmap: jmap}, nil
    40  }
    41  
    42  func (s *Journald) Log(msg *logger.Message) error {
    43  	if msg.Source == "stderr" {
    44  		return journal.Send(string(msg.Line), journal.PriErr, s.Jmap)
    45  	}
    46  	return journal.Send(string(msg.Line), journal.PriInfo, s.Jmap)
    47  }
    48  
    49  func (s *Journald) Close() error {
    50  	return nil
    51  }
    52  
    53  func (s *Journald) Name() string {
    54  	return name
    55  }