400 строки
12 KiB
Go
400 строки
12 KiB
Go
package push
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import (
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"encoding/json"
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"errors"
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"fmt"
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"strings"
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"github.com/splitio/go-split-commons/v3/service/api/sse"
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"github.com/splitio/go-toolkit/v4/logging"
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)
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// SSE event type constants
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const (
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SSEEventTypeSync = "sync"
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SSEEventTypeMessage = "message"
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SSEEventTypeError = "error"
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)
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// Message type constants
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const (
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MessageTypeUpdate = iota
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MessageTypeControl
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MessageTypeOccupancy
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)
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// Update type constants
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const (
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UpdateTypeSplitChange = "SPLIT_UPDATE"
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UpdateTypeSplitKill = "SPLIT_KILL"
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UpdateTypeSegmentChange = "SEGMENT_UPDATE"
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UpdateTypeContol = "CONTROL"
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)
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// Control type constants
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const (
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ControlTypeStreamingEnabled = "STREAMING_ENABLED"
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ControlTypeStreamingPaused = "STREAMING_PAUSED"
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ControlTypeStreamingDisabled = "STREAMING_DISABLED"
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)
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const (
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occupancuName = "[meta]occupancy"
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occupancyPrefix = "[?occupancy=metrics.publishers]"
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)
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// ErrEmptyEvent indicates an event without message and event fields
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var ErrEmptyEvent = errors.New("empty incoming event")
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// NotificationParser interface
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type NotificationParser interface {
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ParseAndForward(sse.IncomingMessage) (*int64, error)
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}
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// NotificationParserImpl implementas the NotificationParser interface
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type NotificationParserImpl struct {
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logger logging.LoggerInterface
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onSplitUpdate func(*SplitChangeUpdate) error
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onSplitKill func(*SplitKillUpdate) error
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onSegmentUpdate func(*SegmentChangeUpdate) error
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onControlUpdate func(*ControlUpdate) *int64
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onOccupancyMesage func(*OccupancyMessage) *int64
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onAblyError func(*AblyError) *int64
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}
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// ParseAndForward accepts an incoming RAW event and returns a properly parsed & typed event
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func (p *NotificationParserImpl) ParseAndForward(raw sse.IncomingMessage) (*int64, error) {
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if raw.Event() == "" {
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if raw.ID() == "" {
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return nil, ErrEmptyEvent
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}
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// If it has ID its a sync event, which we're not using not. Ignore.
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p.logger.Debug("Ignoring sync event")
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return nil, nil
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}
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data := genericData{}
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err := json.Unmarshal([]byte(raw.Data()), &data)
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if err != nil {
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return nil, fmt.Errorf("error parsing JSON: %w", err)
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}
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switch raw.Event() {
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case SSEEventTypeError:
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return p.parseError(&data)
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case SSEEventTypeMessage:
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return p.parseMessage(&data)
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}
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return nil, nil
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}
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func (p *NotificationParserImpl) parseError(data *genericData) (*int64, error) {
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return p.onAblyError(&AblyError{
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code: data.Code,
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statusCode: data.StatusCode,
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message: data.Message,
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href: data.Href,
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timestamp: data.Timestamp,
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}), nil
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}
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func (p *NotificationParserImpl) parseMessage(data *genericData) (*int64, error) {
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var nested genericMessageData
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err := json.Unmarshal([]byte(data.Data), &nested)
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if err != nil {
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return nil, fmt.Errorf("error parsing message nested json data: %w", err)
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}
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if data.Name == occupancuName {
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return p.onOccupancyMesage(&OccupancyMessage{
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BaseMessage: BaseMessage{
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timestamp: data.Timestamp,
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channel: data.Channel,
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},
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publishers: nested.Metrics.Publishers,
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}), nil
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}
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return p.parseUpdate(data, &nested)
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}
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func (p *NotificationParserImpl) parseUpdate(data *genericData, nested *genericMessageData) (*int64, error) {
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if data == nil || nested == nil {
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return nil, errors.New("parseUpdate: data cannot be nil")
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}
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base := BaseUpdate{
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BaseMessage: BaseMessage{timestamp: data.Timestamp, channel: data.Channel},
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changeNumber: nested.ChangeNumber,
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}
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switch nested.Type {
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case UpdateTypeSplitChange:
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return nil, p.onSplitUpdate(&SplitChangeUpdate{BaseUpdate: base})
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case UpdateTypeSplitKill:
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return nil, p.onSplitKill(&SplitKillUpdate{BaseUpdate: base, splitName: nested.SplitName, defaultTreatment: nested.DefaultTreatment})
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case UpdateTypeSegmentChange:
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return nil, p.onSegmentUpdate(&SegmentChangeUpdate{BaseUpdate: base, segmentName: nested.SegmentName})
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case UpdateTypeContol:
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return p.onControlUpdate(&ControlUpdate{BaseMessage: base.BaseMessage, controlType: nested.ControlType}), nil
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default:
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// TODO: log full event in debug mode
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return nil, fmt.Errorf("invalid update type: %s", nested.Type)
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}
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}
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// Event basic interface
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type Event interface {
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fmt.Stringer
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EventType() string
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Timestamp() int64
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}
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// SSESyncEvent represents an SSE Sync event with only id (used for resuming connections)
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type SSESyncEvent struct {
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id string
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timestamp int64
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}
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// EventType always returns SSEEventTypeSync for SSESyncEvents
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func (e *SSESyncEvent) EventType() string { return SSEEventTypeSync }
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// Timestamp returns the timestamp of the event parsing
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func (e *SSESyncEvent) Timestamp() int64 { return e.timestamp }
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// String returns the string represenation of the event
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func (e *SSESyncEvent) String() string {
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return fmt.Sprintf("SSESync(id=%s,timestamp=%d)", e.id, e.timestamp)
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}
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// AblyError struct
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type AblyError struct {
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code int
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statusCode int
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message string
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href string
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timestamp int64
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}
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// EventType always returns SSEEventTypeError for AblyError
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func (a *AblyError) EventType() string { return SSEEventTypeError }
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// Code returns the error code
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func (a *AblyError) Code() int { return a.code }
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// StatusCode returns the status code
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func (a *AblyError) StatusCode() int { return a.statusCode }
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// Message returns the error message
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func (a *AblyError) Message() string { return a.message }
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// Href returns the documentation link
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func (a *AblyError) Href() string { return a.href }
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// Timestamp returns the error timestamp
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func (a *AblyError) Timestamp() int64 { return a.timestamp }
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// IsRetryable returns whether the error is recoverable via a push subsystem restart
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func (a *AblyError) IsRetryable() bool { return a.code >= 40140 && a.code <= 40149 }
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// String returns the string representation of the ably error
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func (a *AblyError) String() string {
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return fmt.Sprintf("AblyError(code=%d,statusCode=%d,message=%s,timestamp=%d,isRetryable=%t)",
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a.code, a.statusCode, a.message, a.timestamp, a.IsRetryable())
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}
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// Message basic interface
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type Message interface {
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Event
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MessageType() int64
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Channel() string
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}
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// BaseMessage contains the basic message-specific fields and methods
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type BaseMessage struct {
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timestamp int64
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channel string
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}
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// EventType always returns SSEEventTypeMessage for BaseMessage and embedding types
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func (m *BaseMessage) EventType() string { return SSEEventTypeMessage }
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// Timestamp returns the timestamp of the message reception
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func (m *BaseMessage) Timestamp() int64 { return m.timestamp }
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// Channel returns which channel the message was received in
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func (m *BaseMessage) Channel() string { return m.channel }
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// OccupancyMessage contains fields & methods related to ocupancy messages
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type OccupancyMessage struct {
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BaseMessage
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publishers int64
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}
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// MessageType always returns MessageTypeOccupancy for Occupancy messages
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func (o *OccupancyMessage) MessageType() int64 { return MessageTypeOccupancy }
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// ChannelWithoutPrefix returns the original channel namem without the metadata prefix
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func (o *OccupancyMessage) ChannelWithoutPrefix() string {
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return strings.Replace(o.Channel(), occupancyPrefix, "", 1)
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}
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// Publishers returbs the amount of publishers in the current channel
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func (o *OccupancyMessage) Publishers() int64 {
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return o.publishers
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}
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// Strings returns the string representation of an occupancy message
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func (o *OccupancyMessage) String() string {
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return fmt.Sprintf("Occupancy(channel=%s,publishers=%d,timestamp=%d)",
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o.Channel(), o.publishers, o.Timestamp())
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}
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// Update basic interface
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type Update interface {
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Message
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UpdateType() string
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ChangeNumber() int64
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}
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// BaseUpdate contains fields & methods related to update-based messages
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type BaseUpdate struct {
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BaseMessage
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changeNumber int64
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}
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// MessageType alwats returns MessageType for Update messages
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func (b *BaseUpdate) MessageType() int64 { return MessageTypeUpdate }
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// ChangeNumber returns the changeNumber of the update
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func (b *BaseUpdate) ChangeNumber() int64 { return b.changeNumber }
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// SplitChangeUpdate represents a SplitChange notification generated in the split servers
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type SplitChangeUpdate struct {
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BaseUpdate
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}
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// UpdateType always returns UpdateTypeSplitChange for SplitKillUpdate messages
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func (u *SplitChangeUpdate) UpdateType() string { return UpdateTypeSplitChange }
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// String returns the String representation of a split change notification
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func (u *SplitChangeUpdate) String() string {
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return fmt.Sprintf("SplitChange(channel=%s,changeNumber=%d,timestamp=%d)",
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u.Channel(), u.ChangeNumber(), u.Timestamp())
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}
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// SplitKillUpdate represents a SplitKill notification generated in the split servers
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type SplitKillUpdate struct {
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BaseUpdate
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splitName string
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defaultTreatment string
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}
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// UpdateType always returns UpdateTypeSplitKill for SplitKillUpdate messages
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func (u *SplitKillUpdate) UpdateType() string { return UpdateTypeSplitKill }
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// SplitName returns the name of the killed split
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func (u *SplitKillUpdate) SplitName() string { return u.splitName }
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// DefaultTreatment returns the last default treatment seen in the split servers for this split
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func (u *SplitKillUpdate) DefaultTreatment() string { return u.defaultTreatment }
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// ToSplitChangeUpdate Maps this kill notification to a split change one
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func (u *SplitKillUpdate) ToSplitChangeUpdate() *SplitChangeUpdate {
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return &SplitChangeUpdate{BaseUpdate: u.BaseUpdate}
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}
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// String returns the string representation of this update
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func (u *SplitKillUpdate) String() string {
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return fmt.Sprintf("SplitKill(channel=%s,changeNumber=%d,splitName=%s,defaultTreatment=%s,timestamp=%d)",
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u.Channel(), u.ChangeNumber(), u.SplitName(), u.DefaultTreatment(), u.Timestamp())
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}
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// SegmentChangeUpdate represents a segment change notification generated in the split servers.
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type SegmentChangeUpdate struct {
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BaseUpdate
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segmentName string
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}
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// UpdateType is always UpdateTypeSegmentChange for Segmet Updates
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func (u *SegmentChangeUpdate) UpdateType() string { return UpdateTypeSegmentChange }
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// SegmentName returns the name of the updated segment
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func (u *SegmentChangeUpdate) SegmentName() string { return u.segmentName }
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// String returns the string representation of a segment update notification
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func (u *SegmentChangeUpdate) String() string {
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return fmt.Sprintf("SegmentChange(channel=%s,changeNumber=%d,segmentName=%s,timestamp=%d",
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u.Channel(), u.ChangeNumber(), u.segmentName, u.Timestamp())
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}
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// ControlUpdate represents a control notification generated by the split push subsystem
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type ControlUpdate struct {
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BaseMessage
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controlType string
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}
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// MessageType always returns MessageTypeControl for Control messages
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func (u *ControlUpdate) MessageType() int64 { return MessageTypeControl }
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// ControlType returns the type of control notification received
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func (u *ControlUpdate) ControlType() string { return u.controlType }
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// String returns a string representation of this notification
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func (u *ControlUpdate) String() string {
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return fmt.Sprintf("Control(channel=%s,type=%s,timestamp=%d)",
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u.Channel(), u.controlType, u.Timestamp())
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}
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type genericData struct {
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// Error associated data
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Code int `json:"code"`
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StatusCode int `json:"statusCode"`
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Message string `json:"message"`
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Href string `json:"href"`
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ClientID string `json:"clientId"`
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ID string `json:"id"`
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Name string `json:"name"`
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Timestamp int64 `json:"timestamp"`
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Encoding string `json:"encoding"`
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Channel string `json:"channel"`
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Data string `json:"data"`
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//"id":"tO4rXGE4CX:0:0","timestamp":1612897630627,"encoding":"json","channel":"[?occupancy=metrics.publishers]control_sec","data":"{\"metrics\":{\"publishers\":0}}","name":"[meta]occupancy"}
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}
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type metrics struct {
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Publishers int64 `json:"publishers"`
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}
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type genericMessageData struct {
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Metrics metrics `json:"metrics"`
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Type string `json:"type"`
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ChangeNumber int64 `json:"changeNumber"`
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SplitName string `json:"splitName"`
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DefaultTreatment string `json:"defaultTreatment"`
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SegmentName string `json:"segmentName"`
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ControlType string `json:"controlType"`
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// {\"type\":\"SPLIT_UPDATE\",\"changeNumber\":1612909342671}"}
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}
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// Compile-type assertions of interface requirements
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var _ Event = &AblyError{}
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var _ Message = &OccupancyMessage{}
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var _ Message = &SplitChangeUpdate{}
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var _ Message = &SplitKillUpdate{}
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var _ Message = &SegmentChangeUpdate{}
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var _ Message = &ControlUpdate{}
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var _ Update = &SplitChangeUpdate{}
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var _ Update = &SplitKillUpdate{}
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var _ Update = &SegmentChangeUpdate{}
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