mirror of
https://github.com/turbot/steampipe.git
synced 2025-12-19 18:12:43 -05:00
187 lines
7.0 KiB
Go
187 lines
7.0 KiB
Go
package pluginmanager
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import (
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"fmt"
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"io"
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"log"
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"os/exec"
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"path/filepath"
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"syscall"
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"time"
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"github.com/hashicorp/go-hclog"
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"github.com/hashicorp/go-plugin"
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"github.com/spf13/viper"
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"github.com/turbot/pipe-fittings/v2/app_specific"
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"github.com/turbot/pipe-fittings/v2/constants"
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"github.com/turbot/steampipe-plugin-sdk/v5/logging"
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"github.com/turbot/steampipe-plugin-sdk/v5/sperr"
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"github.com/turbot/steampipe/v2/pkg/pluginmanager_service/grpc"
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pb "github.com/turbot/steampipe/v2/pkg/pluginmanager_service/grpc/proto"
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pluginshared "github.com/turbot/steampipe/v2/pkg/pluginmanager_service/grpc/shared"
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)
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// StartNewInstance loads the plugin manager state, stops any previous instance and instantiates a new plugin manager
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func StartNewInstance(steampipeExecutablePath string) (*State, error) {
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// try to load the plugin manager state
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state, err := LoadState()
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if err != nil {
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log.Printf("[WARN] plugin manager StartNewInstance() - load state failed: %s", err)
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return nil, err
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}
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if state.Running {
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log.Printf("[TRACE] plugin manager StartNewInstance() found previous instance of plugin manager still running - stopping it")
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// stop the current instance
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if err := stop(state); err != nil {
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log.Printf("[WARN] failed to stop previous instance of plugin manager: %s", err)
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return nil, err
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}
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}
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return start(steampipeExecutablePath)
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}
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// start plugin manager, without checking it is already running
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// we need to be provided with the exe path as we have no way of knowing where the steampipe exe it
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// when the plugin mananager is first started by steampipe, we derive the exe path from the running process and
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// store it in the plugin manager state file - then if the fdw needs to start the plugin manager it knows how to
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func start(steampipeExecutablePath string) (*State, error) {
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// first resolve the steampipe executable path to be the actual exe path
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// - so that we DO NOT store a symlink in the plugin manager state
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// (If steampipe is started via a symlink, if we do not resolve the symlink, the state file will contain the symlink
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// which means pluginmanager.State.verifyRunning will return a false negative, i.e. it will think the plugin
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// manager is not running, as the exe stored in the state file does not match the actual running process)
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resolvedExecutablePath, err := filepath.EvalSymlinks(steampipeExecutablePath)
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if err != nil {
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log.Printf("[WARN] could not resolve symlink for %s: %s", steampipeExecutablePath, err)
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return nil, err
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}
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// note: we assume the install dir has been assigned to file_paths.app_specific.InstallDir
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// - this is done both by the FDW and Steampipe
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pluginManagerCmd := exec.Command(resolvedExecutablePath,
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"plugin-manager",
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"--"+constants.ArgInstallDir, app_specific.InstallDir)
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// set attributes on the command to ensure the process is not shutdown when its parent terminates
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pluginManagerCmd.SysProcAttr = &syscall.SysProcAttr{
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Setpgid: true,
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}
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// discard logging from the plugin manager client (plugin manager logs will still flow through to the log file
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// as this is set up in the plugin manager)
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logger := logging.NewLogger(&hclog.LoggerOptions{Name: "plugin", Output: io.Discard})
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// launch the plugin manager the plugin process
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client := plugin.NewClient(&plugin.ClientConfig{
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HandshakeConfig: pluginshared.Handshake,
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Plugins: pluginshared.PluginMap,
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Cmd: pluginManagerCmd,
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AllowedProtocols: []plugin.Protocol{plugin.ProtocolGRPC},
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Logger: logger,
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StartTimeout: time.Duration(viper.GetInt(constants.ArgPluginStartTimeout)) * time.Second,
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})
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if _, err := client.Start(); err != nil {
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log.Printf("[WARN] plugin manager start() failed to start GRPC client for plugin manager: %s", err)
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// attempt to retrieve error message encoded in the plugin stdout
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err = sperr.WrapWithMessage(grpc.HandleStartFailure(err), "failed to start plugin manager")
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return nil, err
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}
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// create a plugin manager state.
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state := NewState(resolvedExecutablePath, client.ReattachConfig())
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log.Printf("[TRACE] start: started plugin manager, pid %d", state.Pid)
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// now save the state
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if err := state.Save(); err != nil {
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return nil, err
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}
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return state, nil
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}
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// Stop loads the plugin manager state and if a running instance is found, stop it
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func Stop() error {
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log.Println("[DEBUG] pluginmanager.Stop start")
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defer log.Println("[DEBUG] pluginmanager.Stop end")
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// try to load the plugin manager state
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state, err := LoadState()
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if err != nil {
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return err
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}
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if state == nil || !state.Running {
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// nothing to do
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return nil
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}
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return stop(state)
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}
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// stop the running plugin manager instance
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func stop(state *State) error {
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log.Println("[DEBUG] pluginmanager.stop start")
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defer log.Println("[DEBUG] pluginmanager.stop end")
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pluginManager, err := NewPluginManagerClient(state)
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if err != nil {
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return err
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}
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log.Printf("[TRACE] pluginManager.Shutdown")
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// tell plugin manager to kill all plugins
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_, err = pluginManager.Shutdown(&pb.ShutdownRequest{})
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if err != nil {
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return err
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}
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log.Printf("[TRACE] pluginManager.Shutdown done")
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// kill the underlying client
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log.Printf("[TRACE] pluginManager.Shutdown killing raw client")
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pluginManager.rawClient.Kill()
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log.Printf("[TRACE] pluginManager.Shutdown killed raw client")
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// now kill the plugin manager process itself if needed and clear the state file
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return state.kill()
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}
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// GetPluginManager connects to a running plugin manager
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func GetPluginManager() (pluginshared.PluginManager, error) {
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return getPluginManager(true)
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}
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// getPluginManager determines whether the plugin manager is running
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// if not,and if startIfNeeded is true, it starts the manager
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// it then returns a plugin manager client
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func getPluginManager(startIfNeeded bool) (pluginshared.PluginManager, error) {
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// try to load the plugin manager state
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state, err := LoadState()
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if err != nil {
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log.Printf("[WARN] failed to load plugin manager state: %s", err.Error())
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return nil, err
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}
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// if we did not load it and there was no error, it means the plugin manager is not running
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// we cannot start it as we do not know the correct steampipe exe path - which is stored in the state
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// this is not expected - we would expect the plugin manager to have been started with the datatbase
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if state.Executable == "" {
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return nil, fmt.Errorf("plugin manager is not running and there is no state file")
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}
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if state.Running {
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log.Printf("[TRACE] plugin manager is running - returning client")
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return NewPluginManagerClient(state)
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}
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// if the plugin manager is not running, it must have crashed/terminated
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log.Printf("[TRACE] GetPluginManager called but plugin manager not running")
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// is we are not already recursing, start the plugin manager then recurse back into this function
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if startIfNeeded {
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log.Printf("[TRACE] calling StartNewInstance()")
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// start the plugin manager
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if _, err := start(state.Executable); err != nil {
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return nil, err
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}
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// recurse in, setting startIfNeeded to false to avoid further recursion on failure
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return getPluginManager(false)
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}
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// not retrying - just fail
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return nil, fmt.Errorf("plugin manager is not running")
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}
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