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Refactor handling of runtime configuration to prepare for reloading
This commit is contained in:
Frederik Ring
@@ -5,230 +5,8 @@ package main
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import (
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"flag"
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"fmt"
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"log/slog"
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"os"
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"os/signal"
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"runtime"
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"syscall"
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"github.com/robfig/cron/v3"
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)
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type command struct {
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logger *slog.Logger
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}
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func newCommand() *command {
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return &command{
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logger: slog.New(slog.NewTextHandler(os.Stdout, nil)),
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}
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}
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func (c *command) must(err error) {
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if err != nil {
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c.logger.Error(
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fmt.Sprintf("Fatal error running command: %v", err),
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"error",
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err,
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)
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os.Exit(1)
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}
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}
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func runScript(c *Config, envVars map[string]string) (err error) {
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defer func() {
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if derr := recover(); derr != nil {
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err = fmt.Errorf("runScript: unexpected panic running script: %v", err)
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}
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}()
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s, unlock, err := newScript(c, envVars)
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if err != nil {
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err = fmt.Errorf("runScript: error instantiating script: %w", err)
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return
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}
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defer func() {
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derr := unlock()
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if err != nil {
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err = fmt.Errorf("runScript: error releasing file lock: %w", derr)
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}
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}()
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runErr := func() (err error) {
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scriptErr := func() error {
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if err := s.withLabeledCommands(lifecyclePhaseArchive, func() (err error) {
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restartContainersAndServices, err := s.stopContainersAndServices()
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// The mechanism for restarting containers is not using hooks as it
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// should happen as soon as possible (i.e. before uploading backups or
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// similar).
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defer func() {
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derr := restartContainersAndServices()
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if err == nil {
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err = derr
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}
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}()
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if err != nil {
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return
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}
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err = s.createArchive()
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return
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})(); err != nil {
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return err
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}
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if err := s.withLabeledCommands(lifecyclePhaseProcess, s.encryptArchive)(); err != nil {
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return err
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}
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if err := s.withLabeledCommands(lifecyclePhaseCopy, s.copyArchive)(); err != nil {
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return err
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}
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if err := s.withLabeledCommands(lifecyclePhasePrune, s.pruneBackups)(); err != nil {
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return err
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}
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return nil
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}()
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if hookErr := s.runHooks(scriptErr); hookErr != nil {
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if scriptErr != nil {
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return fmt.Errorf(
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"runScript: error %w executing the script followed by %w calling the registered hooks",
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scriptErr,
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hookErr,
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)
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}
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return fmt.Errorf(
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"runScript: the script ran successfully, but an error occurred calling the registered hooks: %w",
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hookErr,
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)
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}
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if scriptErr != nil {
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return fmt.Errorf("runScript: error running script: %w", scriptErr)
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}
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return nil
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}()
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if runErr != nil {
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s.logger.Error(
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fmt.Sprintf("Script run failed: %v", runErr), "error", runErr,
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)
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}
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return runErr
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}
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func (c *command) runInForeground(profileCronExpression string) error {
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cr := cron.New(
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cron.WithParser(
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cron.NewParser(
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cron.SecondOptional | cron.Minute | cron.Hour | cron.Dom | cron.Month | cron.Dow | cron.Descriptor,
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),
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),
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)
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addJob := func(config *Config, name string, envVars map[string]string) error {
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if _, err := cr.AddFunc(config.BackupCronExpression, func() {
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c.logger.Info(
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fmt.Sprintf(
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"Now running script on schedule %s",
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config.BackupCronExpression,
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),
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)
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if err := runScript(config, envVars); err != nil {
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c.logger.Error(
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fmt.Sprintf(
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"Unexpected error running schedule %s: %v",
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config.BackupCronExpression,
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err,
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),
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"error",
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err,
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)
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}
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}); err != nil {
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return fmt.Errorf("addJob: error adding schedule %s: %w", config.BackupCronExpression, err)
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}
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c.logger.Info(fmt.Sprintf("Successfully scheduled backup %s with expression %s", name, config.BackupCronExpression))
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if ok := checkCronSchedule(config.BackupCronExpression); !ok {
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c.logger.Warn(
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fmt.Sprintf("Scheduled cron expression %s will never run, is this intentional?", config.BackupCronExpression),
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)
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}
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return nil
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}
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cs, err := loadEnvFiles("/etc/dockervolumebackup/conf.d")
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if err != nil {
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if !os.IsNotExist(err) {
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return fmt.Errorf("runInForeground: could not load config from environment files: %w", err)
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}
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c, err := loadEnvVars()
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if err != nil {
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return fmt.Errorf("runInForeground: could not load config from environment variables: %w", err)
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} else {
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err = addJob(c, "from environment", nil)
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if err != nil {
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return fmt.Errorf("runInForeground: error adding job from env: %w", err)
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}
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}
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} else {
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c.logger.Info("/etc/dockervolumebackup/conf.d was found, using configuration files from this directory.")
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for _, config := range cs {
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err = addJob(config.config, config.name, config.additionalEnvVars)
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if err != nil {
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return fmt.Errorf("runInForeground: error adding jobs from conf files: %w", err)
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}
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}
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}
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if profileCronExpression != "" {
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if _, err := cr.AddFunc(profileCronExpression, func() {
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memStats := runtime.MemStats{}
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runtime.ReadMemStats(&memStats)
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c.logger.Info(
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"Collecting runtime information",
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"num_goroutines",
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runtime.NumGoroutine(),
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"memory_heap_alloc",
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formatBytes(memStats.HeapAlloc, false),
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"memory_heap_inuse",
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formatBytes(memStats.HeapInuse, false),
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"memory_heap_sys",
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formatBytes(memStats.HeapSys, false),
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"memory_heap_objects",
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memStats.HeapObjects,
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)
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}); err != nil {
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return fmt.Errorf("runInForeground: error adding profiling job: %w", err)
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}
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}
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var quit = make(chan os.Signal, 1)
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signal.Notify(quit, syscall.SIGTERM, syscall.SIGINT)
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cr.Start()
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<-quit
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ctx := cr.Stop()
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<-ctx.Done()
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return nil
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}
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func (c *command) runAsCommand() error {
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config, err := loadEnvVars()
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if err != nil {
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return fmt.Errorf("runAsCommand: error loading env vars: %w", err)
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}
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err = runScript(config, nil)
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if err != nil {
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return fmt.Errorf("runAsCommand: error running script: %w", err)
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}
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return nil
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}
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func main() {
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foreground := flag.Bool("foreground", false, "run the tool in the foreground")
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profile := flag.String("profile", "", "collect runtime metrics and log them periodically on the given cron expression")
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@@ -236,7 +14,10 @@ func main() {
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c := newCommand()
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if *foreground {
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c.must(c.runInForeground(*profile))
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opts := foregroundOpts{
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profileCronExpression: *profile,
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}
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c.must(c.runInForeground(opts))
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} else {
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c.must(c.runAsCommand())
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}
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