116 lines
3 KiB
Go
116 lines
3 KiB
Go
package logger // import "github.com/docker/docker/daemon/logger"
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import (
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"fmt"
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"io"
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"os"
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"path/filepath"
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"github.com/docker/docker/api/types/plugins/logdriver"
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"github.com/docker/docker/errdefs"
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getter "github.com/docker/docker/pkg/plugingetter"
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"github.com/docker/docker/pkg/plugins"
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"github.com/docker/docker/pkg/stringid"
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"github.com/pkg/errors"
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)
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var pluginGetter getter.PluginGetter
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const extName = "LogDriver"
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// logPlugin defines the available functions that logging plugins must implement.
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type logPlugin interface {
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StartLogging(streamPath string, info Info) (err error)
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StopLogging(streamPath string) (err error)
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Capabilities() (cap Capability, err error)
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ReadLogs(info Info, config ReadConfig) (stream io.ReadCloser, err error)
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}
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// RegisterPluginGetter sets the plugingetter
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func RegisterPluginGetter(plugingetter getter.PluginGetter) {
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pluginGetter = plugingetter
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}
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// getPlugin returns a logging driver by its name.
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// If the driver is empty, it looks for the local driver.
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func getPlugin(name string, mode int) (Creator, error) {
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p, err := pluginGetter.Get(name, extName, mode)
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if err != nil {
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return nil, fmt.Errorf("error looking up logging plugin %s: %v", name, err)
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}
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client, err := makePluginClient(p)
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if err != nil {
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return nil, err
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}
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return makePluginCreator(name, client, p.ScopedPath), nil
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}
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func makePluginClient(p getter.CompatPlugin) (logPlugin, error) {
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if pc, ok := p.(getter.PluginWithV1Client); ok {
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return &logPluginProxy{pc.Client()}, nil
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}
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pa, ok := p.(getter.PluginAddr)
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if !ok {
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return nil, errdefs.System(errors.Errorf("got unknown plugin type %T", p))
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}
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if pa.Protocol() != plugins.ProtocolSchemeHTTPV1 {
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return nil, errors.Errorf("plugin protocol not supported: %s", p)
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}
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addr := pa.Addr()
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c, err := plugins.NewClientWithTimeout(addr.Network()+"://"+addr.String(), nil, pa.Timeout())
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if err != nil {
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return nil, errors.Wrap(err, "error making plugin client")
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}
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return &logPluginProxy{c}, nil
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}
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func makePluginCreator(name string, l logPlugin, scopePath func(s string) string) Creator {
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return func(logCtx Info) (logger Logger, err error) {
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defer func() {
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if err != nil {
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pluginGetter.Get(name, extName, getter.Release)
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}
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}()
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unscopedPath := filepath.Join("/", "run", "docker", "logging")
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logRoot := scopePath(unscopedPath)
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if err := os.MkdirAll(logRoot, 0700); err != nil {
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return nil, err
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}
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id := stringid.GenerateRandomID()
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a := &pluginAdapter{
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driverName: name,
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id: id,
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plugin: l,
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fifoPath: filepath.Join(logRoot, id),
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logInfo: logCtx,
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}
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cap, err := a.plugin.Capabilities()
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if err == nil {
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a.capabilities = cap
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}
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stream, err := openPluginStream(a)
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if err != nil {
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return nil, err
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}
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a.stream = stream
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a.enc = logdriver.NewLogEntryEncoder(a.stream)
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if err := l.StartLogging(filepath.Join(unscopedPath, id), logCtx); err != nil {
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return nil, errors.Wrapf(err, "error creating logger")
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}
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if cap.ReadLogs {
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return &pluginAdapterWithRead{a}, nil
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}
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return a, nil
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}
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}
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