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moby--moby/daemon/logger/factory.go
Marius Sturm 96d06e106f add UDP GELF logging-driver
allows to send container logs to Graylog or Logstash.

Signed-off-by: Marius Sturm <marius@graylog.com>
2015-06-10 20:21:50 +02:00

82 lines
2 KiB
Go

package logger
import (
"fmt"
"os"
"strings"
"sync"
"time"
)
// Creator is a method that builds a logging driver instance with given context
type Creator func(Context) (Logger, error)
// Context provides enough information for a logging driver to do its function
type Context struct {
Config map[string]string
ContainerID string
ContainerName string
ContainerEntrypoint string
ContainerArgs []string
ContainerImageID string
ContainerImageName string
ContainerCreated time.Time
LogPath string
}
func (ctx *Context) Hostname() (string, error) {
hostname, err := os.Hostname()
if err != nil {
return "", fmt.Errorf("logger: can not resolve hostname: %v", err)
}
return hostname, nil
}
func (ctx *Context) Command() string {
terms := []string{ctx.ContainerEntrypoint}
for _, arg := range ctx.ContainerArgs {
terms = append(terms, arg)
}
command := strings.Join(terms, " ")
return command
}
type logdriverFactory struct {
registry map[string]Creator
m sync.Mutex
}
func (lf *logdriverFactory) register(name string, c Creator) error {
lf.m.Lock()
defer lf.m.Unlock()
if _, ok := lf.registry[name]; ok {
return fmt.Errorf("logger: log driver named '%s' is already registered", name)
}
lf.registry[name] = c
return nil
}
func (lf *logdriverFactory) get(name string) (Creator, error) {
lf.m.Lock()
defer lf.m.Unlock()
c, ok := lf.registry[name]
if !ok {
return c, fmt.Errorf("logger: no log driver named '%s' is registered", name)
}
return c, nil
}
var factory = &logdriverFactory{registry: make(map[string]Creator)} // global factory instance
// RegisterLogDriver registers the given logging driver builder with given logging
// driver name.
func RegisterLogDriver(name string, c Creator) error {
return factory.register(name, c)
}
// GetLogDriver provides the logging driver builder for a logging driver name.
func GetLogDriver(name string) (Creator, error) {
return factory.get(name)
}