// Scene is specified on the SceneManager interface.
func (m *cookieSceneManager) Scene(ctx Context) (scene.Scene, error) {
cookie, err := ctx.Request().Cookie(sceneID)
if err != nil && err != http.ErrNoCookie {
return nil, err
}
request := &sceneRequest{
responseChan: make(chan *sceneResponse, 1),
}
if err == http.ErrNoCookie {
request.id = ""
} else {
request.id = cookie.Value
}
select {
case m.requestChan <- request:
case <-m.loop.IsStopping():
return nil, errors.New(ErrSceneManagement, errorMessages, "stopping")
}
m.requestChan <- request
select {
case response := <-request.responseChan:
cookie = &http.Cookie{
Name: sceneID,
Value: response.id,
}
http.SetCookie(ctx.ResponseWriter(), cookie)
return response.scene, nil
case <-m.loop.IsStopping():
return nil, errors.New(ErrSceneManagement, errorMessages, "stopping")
}
}
// WaitFlagLimited is specified on the Scene interface.
func (s *scene) WaitFlagLimited(topic string, timeout time.Duration) error {
// Add signal channel.
command := &envelope{
kind: wait,
signaling: &signaling{
topic: topic,
signalChan: make(chan struct{}, 1),
},
respChan: make(chan *envelope, 1),
}
_, err := s.command(command)
if err != nil {
return err
}
// Wait for signal.
var timeoutChan <-chan time.Time
if timeout > 0 {
timeoutChan = time.After(timeout)
}
select {
case <-s.backend.IsStopping():
err = s.Wait()
if err == nil {
err = errors.New(ErrSceneEnded, errorMessages)
}
return err
case <-command.signaling.signalChan:
return nil
case <-timeoutChan:
return errors.New(ErrWaitedTooLong, errorMessages, topic)
}
}
// backendLoop runs the backend loop of the scene.
func (s *scene) backendLoop(l loop.Loop) (err error) {
// Defer cleanup.
defer func() {
cerr := s.cleanupAllProps()
if err == nil {
err = cerr
}
}()
// Init timers.
var watchdog <-chan time.Time
var clapperboard <-chan time.Time
if s.absolute > 0 {
clapperboard = time.After(s.absolute)
}
// Run loop.
for {
if s.inactivity > 0 {
watchdog = time.After(s.inactivity)
}
select {
case <-l.ShallStop():
return nil
case timeout := <-watchdog:
return errors.New(ErrTimeout, errorMessages, "inactivity", timeout)
case timeout := <-clapperboard:
return errors.New(ErrTimeout, errorMessages, "absolute", timeout)
case command := <-s.commandChan:
s.processCommand(command)
}
}
}
// CommentNode implements the Builder interface.
func (nb *NodeBuilder) CommentNode(comment string) error {
if nb.done {
return errors.New(ErrBuilder, errorMessages, "building is already done")
}
if len(nb.stack) > 0 {
nb.stack[len(nb.stack)-1].appendCommentNode(comment)
return nil
}
return errors.New(ErrBuilder, errorMessages, "no opening tag for comment")
}
// RawNode implements the Builder interface.
func (nb *NodeBuilder) RawNode(raw string) error {
if nb.done {
return errors.New(ErrBuilder, errorMessages, "building is already done")
}
if len(nb.stack) > 0 {
nb.stack[len(nb.stack)-1].appendRawNode(raw)
return nil
}
return errors.New(ErrBuilder, errorMessages, "no opening tag for raw text")
}
// ValueAt returns the value at index.
func (rs *ResultSet) ValueAt(index int) (Value, error) {
if len(rs.items) < index+1 {
return nil, errors.New(ErrIllegalItemIndex, errorMessages, index, len(rs.items))
}
value, ok := rs.items[index].(Value)
if !ok {
return nil, errors.New(ErrIllegalItemType, errorMessages, index, "value")
}
return value, nil
}
// ResultSetAt returns the nested result set at index.
func (rs *ResultSet) ResultSetAt(index int) (*ResultSet, error) {
if len(rs.items) < index-1 {
return nil, errors.New(ErrIllegalItemIndex, errorMessages, index, len(rs.items))
}
resultSet, ok := rs.items[index].(*ResultSet)
if !ok {
return nil, errors.New(ErrIllegalItemType, errorMessages, index, "result set")
}
return resultSet, nil
}
// receiveResponse retrieves a response from the server.
func (r *resp) receiveResponse() *response {
// Receive first line.
line, err := r.reader.ReadBytes('\n')
if err != nil {
rerr := errors.Annotate(err, ErrConnectionBroken, errorMessages, "receive after "+r.cmd)
return &response{receivingError, 0, nil, rerr}
}
content := line[1 : len(line)-2]
// First byte defines kind.
switch line[0] {
case '+':
// Status response.
return &response{statusResponse, 0, line[:len(line)-2], nil}
case '-':
// Error response.
return &response{errorResponse, 0, line[:len(line)-2], nil}
case ':':
// Integer response.
return &response{integerResponse, 0, content, nil}
case '$':
// Bulk response or null bulk response.
count, err := strconv.Atoi(string(content))
if err != nil {
return &response{receivingError, 0, nil, errors.Annotate(err, ErrServerResponse, errorMessages)}
}
if count == -1 {
// Null bulk response.
return &response{nullBulkResponse, 0, nil, nil}
}
// Receive the bulk data.
toRead := count + 2
buffer := make([]byte, toRead)
n, err := io.ReadFull(r.reader, buffer)
if err != nil {
return &response{receivingError, 0, nil, err}
}
if n < toRead {
return &response{receivingError, 0, nil, errors.New(ErrServerResponse, errorMessages)}
}
return &response{bulkResponse, 0, buffer[0:count], nil}
case '*':
// Array reply. Check for timeout.
length, err := strconv.Atoi(string(content))
if err != nil {
return &response{receivingError, 0, nil, errors.Annotate(err, ErrServerResponse, errorMessages)}
}
if length == -1 {
// Timeout.
return &response{timeoutError, 0, nil, nil}
}
return &response{arrayResponse, length, nil, nil}
}
return &response{receivingError, 0, nil, errors.New(ErrInvalidResponse, errorMessages, string(line))}
}
// checkIDs checks if the passed IDs are valid. It is only
// called internally, so no locking.
func (r *registry) checkIDs(emitterID string, subscriberIDs ...string) error {
for _, subscriberID := range subscriberIDs {
if subscriberID == emitterID {
return errors.New(ErrInvalidID, errorMessages, subscriberID)
}
if _, ok := r.cellers[subscriberID]; !ok {
return errors.New(ErrInvalidID, errorMessages, subscriberID)
}
}
return nil
}
// Validate checks if the enclosure is valid.
func (e *Enclosure) Validate() error {
if e.Length < 1 {
return errors.New(ErrValidation, errorMessages, "item enclosure length %d is too small", e.Length)
}
if e.Type == "" {
return errors.New(ErrValidation, errorMessages, "item enclosure type must not be empty")
}
if _, err := url.Parse(e.URL); err != nil {
return errors.Annotate(err, ErrParsing, errorMessages, "item enclosure url")
}
return nil
}
// Respond is specified on the Event interface.
func (e *event) Respond(response interface{}) error {
responseChanPayload, ok := e.Payload().Get(ResponseChanPayload)
if !ok {
return errors.New(ErrInvalidResponseEvent, errorMessages, "no response channel")
}
responseChan, ok := responseChanPayload.(chan interface{})
if !ok {
return errors.New(ErrInvalidResponseEvent, errorMessages, "invalid response channel")
}
responseChan <- response
return nil
}
// Validate checks if the cloud is valid.
func (c *Cloud) Validate() error {
if c.Domain == "" {
return errors.New(ErrValidation, errorMessages, "cloud domain must not be empty")
}
if c.Path == "" || c.Path[0] != '/' {
return errors.New(ErrValidation, errorMessages, "cloud path %q must not be empty and has to start with a slash", c.Path)
}
if c.Port < 1 || c.Port > 65535 {
return errors.New(ErrValidation, errorMessages, "cloud port %d is out of range", c.Port)
}
return nil
}
// EndTagNode implements the Builder interface.
func (nb *NodeBuilder) EndTagNode() error {
if nb.done {
return errors.New(ErrBuilder, errorMessages, "building is already done")
}
switch l := len(nb.stack); l {
case 0:
return errors.New(ErrBuilder, errorMessages, "no opening tag")
case 1:
nb.done = true
default:
nb.stack[l-2].appendChild(nb.stack[l-1])
nb.stack = nb.stack[:l-1]
}
return nil
}
// Validate checks if the text input is valid.
func (t *TextInput) Validate() error {
if t.Description == "" {
return errors.New(ErrValidation, errorMessages, "text input description must not be empty")
}
if _, err := url.Parse(t.Link); err != nil {
return errors.Annotate(err, ErrParsing, errorMessages, "text input link")
}
if t.Name == "" {
return errors.New(ErrValidation, errorMessages, "text input name must not be empty")
}
if t.Title == "" {
return errors.New(ErrValidation, errorMessages, "text input title must not be empty")
}
return nil
}
// ScoredValues returns the alternating values as scored values slice. If
// withscores is false the result set contains no scores and so they are
// set to 0.0 in the returned scored values.
func (rs *ResultSet) ScoredValues(withscores bool) (ScoredValues, error) {
svs := ScoredValues{}
sv := ScoredValue{}
for index, item := range rs.items {
value, ok := item.(Value)
if !ok {
return nil, errors.New(ErrIllegalItemType, errorMessages, index, "value")
}
if withscores {
// With scores, so alternating values and scores.
if index%2 == 0 {
sv.Value = value
} else {
score, err := value.Float64()
if err != nil {
return nil, err
}
sv.Score = score
svs = append(svs, sv)
sv = ScoredValue{}
}
} else {
// No scores, only values.
sv.Value = value
svs = append(svs, sv)
sv = ScoredValue{}
}
}
return svs, nil
}
// receiveResultSet receives all responses and converts them into a result set.
func (r *resp) receiveResultSet() (*ResultSet, error) {
defer func() { r.cmd = "-none-" }()
result := newResultSet()
current := result
for {
response := r.receiveResponse()
switch response.kind {
case receivingError:
return nil, response.err
case timeoutError:
return nil, errors.New(ErrTimeout, errorMessages)
case statusResponse, errorResponse, integerResponse, bulkResponse, nullBulkResponse:
current.append(response.value())
case arrayResponse:
switch {
case current == result && current.Len() == 0:
current.length = response.length
case !current.allReceived():
next := newResultSet()
next.parent = current
current.append(next)
current = next
current.length = response.length
}
}
// Check if all values are received.
current = current.nextResultSet()
if current == nil {
return result, nil
}
}
}
// Get implements the Value interface.
func (v *value) Get() (string, error) {
sv, err := v.changer.Value()
if err != nil {
return "", errors.New(ErrInvalidPath, errorMessages, pathToString(v.path))
}
return sv, nil
}
// NewEvent creates a new event with the given topic and payload.
func NewEvent(topic string, payload interface{}, ctx context.Context) (Event, error) {
if topic == "" {
return nil, errors.New(ErrNoTopic, errorMessages)
}
p := NewPayload(payload)
return &event{topic, p, ctx}, nil
}
// BeginTagNode implements the sml.Builder interface.
func (b *configBuilder) BeginTagNode(tag string) error {
switch {
case b.values == nil && tag != "config":
return errors.New(ErrIllegalConfigSource, errorMessages, `does not start with "config" node`)
case b.values == nil:
b.stack = collections.NewStringStack(tag)
b.values = collections.NewKeyStringValueTree(tag, "", false)
default:
b.stack.Push(tag)
changer := b.values.Create(b.stack.All()...)
if changer.Error() != nil {
return errors.New(ErrIllegalConfigSource, errorMessages, changer.Error())
}
}
return nil
}
// NewEvent creates a new event with the given topic and payload.
func NewEvent(topic string, payload interface{}, scene scene.Scene) (Event, error) {
if topic == "" {
return nil, errors.New(ErrNoTopic, errorMessages)
}
p := NewPayload(payload)
return &event{topic, p, scene}, nil
}
// Peek implements the Stack interface.
func (s stack) Peek() (interface{}, error) {
lv := len(s.values)
if lv == 0 {
return nil, errors.New(ErrEmpty, errorMessages)
}
v := s.values[lv-1]
return v, nil
}
// Peek implements the StringStack interface.
func (s *stringStack) Peek() (string, error) {
lv := len(s.values)
if lv == 0 {
return "", errors.New(ErrEmpty, errorMessages)
}
v := s.values[lv-1]
return v, nil
}
// checkRecovering checks if the backend can be recovered.
func (c *Crontab) checkRecovering(rs loop.Recoverings) (loop.Recoverings, error) {
if rs.Frequency(12, time.Minute) {
logger.Errorf("crontab cannot be recovered: %v", rs.Last().Reason)
return nil, errors.New(ErrCrontabCannotBeRecovered, errorMessages, rs.Last().Reason)
}
logger.Warningf("crontab recovered: %v", rs.Last().Reason)
return rs.Trim(12), nil
}
// ProcessEvent implements the Subscriber interface.
func (c *cell) ProcessEvent(event Event) error {
emitTimeoutTicks := 0
for {
select {
case c.eventc <- event:
return nil
case <-c.loop.IsStopping():
return errors.New(ErrInactive, errorMessages, c.id)
case <-c.emitTimeoutTicker.C:
emitTimeoutTicks++
if emitTimeoutTicks > c.emitTimeout {
op := fmt.Sprintf("emitting %q to %q", event.Topic(), c.id)
return errors.New(ErrTimeout, errorMessages, op)
}
}
}
}
// Validate checks if the skip hours are valid.
func (s *SkipHours) Validate() error {
for _, hour := range s.Hours {
if hour < 0 || hour > 23 {
return errors.New(ErrValidation, errorMessages, "skip hour %d is out of range from 0 to 23", hour)
}
}
return nil
}
// ReadGenericJSON is specified on the Context interface.
func (ctx *context) ReadGenericJSON() (map[string]interface{}, error) {
if !ctx.HasContentType(ContentTypeJSON) {
return nil, errors.New(ErrInvalidContentType, errorMessages, ContentTypeJSON)
}
data := map[string]interface{}{}
err := ctx.ReadJSON(&data)
return data, err
}
// TextNode implements the Builder interface.
func (tb *KeyStringValueTreeBuilder) TextNode(text string) error {
if tb.done {
return errors.New(ErrBuilder, errorMessages, "building is already done")
}
value, err := tb.tree.At(tb.stack.All()...).Value()
if err != nil {
return errors.Annotate(err, ErrBuilder, errorMessages)
}
if value != "" {
return errors.New(ErrBuilder, errorMessages, "node has multiple values")
}
text = strings.TrimSpace(text)
if text != "" {
_, err = tb.tree.At(tb.stack.All()...).SetValue(text)
}
return err
}
// checkRecovering checks if the backend can be recovered.
func (b *stdBackend) checkRecovering(rs loop.Recoverings) (loop.Recoverings, error) {
if rs.Frequency(12, time.Minute) {
logger.Errorf("standard monitor cannot be recovered: %v", rs.Last().Reason)
return nil, errors.New(ErrMonitoringCannotBeRecovered, errorMessages, rs.Last().Reason)
}
logger.Warningf("standard monitor recovered: %v", rs.Last().Reason)
return rs.Trim(12), nil
}
// subscribe subscribes cells to an emitter.
func (r *registry) subscribe(emitterID string, subscriberIDs ...string) error {
r.mutex.Lock()
defer r.mutex.Unlock()
ec, ok := r.cells[emitterID]
if !ok {
return errors.New(ErrInvalidID, errorMessages, emitterID)
}
for _, subscriberID := range subscriberIDs {
if sc, ok := r.cells[subscriberID]; ok {
ec.subscribers.add(sc)
sc.emitters.add(ec)
} else {
return errors.New(ErrInvalidID, errorMessages, subscriberID)
}
}
return nil
}
// updateSubscribers sets the subscribers of the cell.
func (c *cell) updateSubscribers(cells []*cell) error {
select {
case c.subscriberc <- cells:
case <-c.loop.IsStopping():
return errors.New(ErrInactive, errorMessages, c.id)
}
return nil
}
