| 0e8e8f0f |
l, err := net.Listen("unix", path)
if err != nil {
return "", errors.Wrap(err, "error setting up metrics plugin listener")
}
mux := http.NewServeMux()
mux.Handle("/metrics", metrics.Handler())
go func() {
http.Serve(l, mux)
}()
daemon.metricsPluginListener = l
return path, nil
}
func registerMetricsPluginCallback(getter plugingetter.PluginGetter, sockPath string) {
getter.Handle(metricsPluginType, func(name string, client *plugins.Client) {
// Use lookup since nothing in the system can really reference it, no need
// to protect against removal
p, err := getter.Get(name, metricsPluginType, plugingetter.Lookup)
if err != nil {
return
}
mp := metricsPlugin{p}
sockBase := mp.sockBase()
if err := os.MkdirAll(sockBase, 0755); err != nil {
logrus.WithError(err).WithField("name", name).WithField("path", sockBase).Error("error creating metrics plugin base path")
return
}
defer func() {
if err != nil {
os.RemoveAll(sockBase)
}
}()
pluginSockPath := filepath.Join(sockBase, mp.sock())
_, err = os.Stat(pluginSockPath)
if err == nil {
mount.Unmount(pluginSockPath)
} else {
logrus.WithField("path", pluginSockPath).Debugf("creating plugin socket")
f, err := os.OpenFile(pluginSockPath, os.O_CREATE, 0600)
if err != nil {
return
}
f.Close()
}
if err := mount.Mount(sockPath, pluginSockPath, "none", "bind,ro"); err != nil {
logrus.WithError(err).WithField("name", name).Error("could not mount metrics socket to plugin")
return
}
if err := pluginStartMetricsCollection(p); err != nil {
if err := mount.Unmount(pluginSockPath); err != nil {
if mounted, _ := mount.Mounted(pluginSockPath); mounted {
logrus.WithError(err).WithField("sock_path", pluginSockPath).Error("error unmounting metrics socket from plugin during cleanup")
}
}
logrus.WithError(err).WithField("name", name).Error("error while initializing metrics plugin")
}
})
} |