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package logger // import "github.com/docker/docker/daemon/logger"
import (
"fmt"
"sort"
"sync"
containertypes "github.com/docker/docker/api/types/container"
"github.com/docker/docker/pkg/plugingetter"
units "github.com/docker/go-units"
"github.com/pkg/errors"
)
// Creator builds a logging driver instance with given context.
type Creator func(Info) (Logger, error)
// LogOptValidator checks the options specific to the underlying
// logging implementation.
type LogOptValidator func(cfg map[string]string) error
type logdriverFactory struct {
registry map[string]Creator
optValidator map[string]LogOptValidator
m sync.Mutex
}
func (lf *logdriverFactory) list() []string {
ls := make([]string, 0, len(lf.registry))
lf.m.Lock()
for name := range lf.registry {
ls = append(ls, name)
}
lf.m.Unlock()
sort.Strings(ls)
return ls
}
// ListDrivers gets the list of registered log driver names
func ListDrivers() []string {
return factory.list()
}
func (lf *logdriverFactory) register(name string, c Creator) error {
registered, err := lf.driverRegistered(name)
if err != nil {
return err
}
if registered {
return fmt.Errorf("logger: log driver named '%s' is already registered", name)
}
lf.m.Lock()
lf.registry[name] = c
lf.m.Unlock()
return nil
}
func (lf *logdriverFactory) driverRegistered(name string) (bool, error) {
lf.m.Lock()
_, ok := lf.registry[name]
lf.m.Unlock()
if !ok {
if pluginGetter != nil { // this can be nil when the init functions are running
l, err := getPlugin(name, plugingetter.Lookup)
if err != nil {
return false, err
}
if l != nil {
return true, nil
}
}
}
return ok, nil
}
func (lf *logdriverFactory) registerLogOptValidator(name string, l LogOptValidator) error {
lf.m.Lock()
defer lf.m.Unlock()
if _, ok := lf.optValidator[name]; ok {
return fmt.Errorf("logger: log validator named '%s' is already registered", name)
}
lf.optValidator[name] = l
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, nil
}
c, err := getPlugin(name, plugingetter.Acquire)
return c, errors.Wrapf(err, "logger: no log driver named '%s' is registered", name)
}
func (lf *logdriverFactory) getLogOptValidator(name string) LogOptValidator {
lf.m.Lock()
defer lf.m.Unlock()
c := lf.optValidator[name]
return c
}
var factory = &logdriverFactory{registry: make(map[string]Creator), optValidator: make(map[string]LogOptValidator)} // 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)
}
// RegisterLogOptValidator registers the logging option validator with
// the given logging driver name.
func RegisterLogOptValidator(name string, l LogOptValidator) error {
return factory.registerLogOptValidator(name, l)
}
// GetLogDriver provides the logging driver builder for a logging driver name.
func GetLogDriver(name string) (Creator, error) {
return factory.get(name)
}
var builtInLogOpts = map[string]bool{
"mode": true,
"max-buffer-size": true,
}
// ValidateLogOpts checks the options for the given log driver. The
// options supported are specific to the LogDriver implementation.
func ValidateLogOpts(name string, cfg map[string]string) error {
if name == "none" {
return nil
}
switch containertypes.LogMode(cfg["mode"]) {
case containertypes.LogModeBlocking, containertypes.LogModeNonBlock, containertypes.LogModeUnset:
default:
return fmt.Errorf("logger: logging mode not supported: %s", cfg["mode"])
}
if s, ok := cfg["max-buffer-size"]; ok {
if containertypes.LogMode(cfg["mode"]) != containertypes.LogModeNonBlock {
return fmt.Errorf("logger: max-buffer-size option is only supported with 'mode=%s'", containertypes.LogModeNonBlock)
}
if _, err := units.RAMInBytes(s); err != nil {
return errors.Wrap(err, "error parsing option max-buffer-size")
}
}
if err := validateExternal(cfg); err != nil {
return err
}
registered, err := factory.driverRegistered(name)
if err != nil {
return err
}
if !registered {
return fmt.Errorf("logger: no log driver named '%s' is registered", name)
}
filteredOpts := make(map[string]string, len(builtInLogOpts))
for k, v := range cfg {
if !builtInLogOpts[k] {
filteredOpts[k] = v
}
}
validator := factory.getLogOptValidator(name)
if validator != nil {
return validator(filteredOpts)
}
return nil
}
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