package caddy import ( "context" "encoding/json" "fmt" "log" "strings" "sync" "time" "github.com/mholt/certmagic" ) // Run runs Caddy with the given config. func Run(newCfg *Config) error { currentCfgMu.Lock() defer currentCfgMu.Unlock() if newCfg != nil { // because we will need to roll back any state // modifications if this function errors, we // keep a single error value and scope all // sub-operations to their own functions to // ensure this error value does not get // overridden or missed when it should have // been set by a short assignment var err error // prepare the new config for use newCfg.apps = make(map[string]App) // create a context within which to load // modules - essentially our new config's // execution environment; be sure that // cleanup occurs when we return if there // was an error; if no error, it will get // cleaned up on next config cycle ctx, cancel := NewContext(Context{Context: context.Background(), cfg: newCfg}) defer func() { if err != nil { cancel() // clean up now } }() newCfg.cancelFunc = cancel // clean up later // set up storage and make it CertMagic's default storage, too err = func() error { if newCfg.StorageRaw != nil { val, err := ctx.LoadModuleInline("system", "caddy.storage", newCfg.StorageRaw) if err != nil { return fmt.Errorf("loading storage module: %v", err) } stor, err := val.(StorageConverter).CertMagicStorage() if err != nil { return fmt.Errorf("creating storage value: %v", err) } newCfg.storage = stor newCfg.StorageRaw = nil // allow GC to deallocate - TODO: Does this help? } if newCfg.storage == nil { newCfg.storage = &certmagic.FileStorage{Path: dataDir()} } certmagic.Default.Storage = newCfg.storage return nil }() if err != nil { return err } // Load, Provision, Validate err = func() error { for modName, rawMsg := range newCfg.AppsRaw { val, err := ctx.LoadModule(modName, rawMsg) if err != nil { return fmt.Errorf("loading app module '%s': %v", modName, err) } newCfg.apps[modName] = val.(App) } return nil }() if err != nil { return err } // Start err = func() error { var started []string for name, a := range newCfg.apps { err := a.Start() if err != nil { for _, otherAppName := range started { err2 := newCfg.apps[otherAppName].Stop() if err2 != nil { err = fmt.Errorf("%v; additionally, aborting app %s: %v", err, otherAppName, err2) } } return fmt.Errorf("%s app module: start: %v", name, err) } started = append(started, name) } return nil }() if err != nil { return err } } // swap old config with the new one oldCfg := currentCfg currentCfg = newCfg // Stop, Cleanup if oldCfg != nil { for name, a := range oldCfg.apps { err := a.Stop() if err != nil { log.Printf("[ERROR] stop %s: %v", name, err) } } // clean up old modules oldCfg.cancelFunc() } return nil } // App is a thing that Caddy runs. type App interface { Start() error Stop() error } // Config represents a Caddy configuration. type Config struct { Admin *AdminConfig `json:"admin,omitempty"` StorageRaw json.RawMessage `json:"storage,omitempty"` storage certmagic.Storage AppsRaw map[string]json.RawMessage `json:"apps,omitempty"` // apps stores the decoded Apps values, // keyed by module name. apps map[string]App cancelFunc context.CancelFunc } // Duration is a JSON-string-unmarshable duration type. type Duration time.Duration // UnmarshalJSON satisfies json.Unmarshaler. func (d *Duration) UnmarshalJSON(b []byte) error { dd, err := time.ParseDuration(strings.Trim(string(b), `"`)) if err != nil { return err } *d = Duration(dd) return nil } // CtxKey is a value type for use with context.WithValue. type CtxKey string // currentCfg is the currently-loaded configuration. var ( currentCfg *Config currentCfgMu sync.RWMutex )