materialisation: Add new message attributes and actions handling

- Added new message attributes, including `action`, `serial`, `refSerial`, `refType`, `updatedAt`, `deletedAt`, and `operation`.
Additionally, create functions to map message actions between string and number representations.
This update also changes the `fromValues` function to handle action transformations.
- Added support to `Publish` so it now correctly sets the `message.action` flag to `message_create`

ably.d.ts

@@ -2335,12 +2335,104 @@ export interface Message {
    * Timestamp of when the message was received by Ably, as milliseconds since the Unix epoch.
    */
   timestamp?: number;
+  /**
+   * The action type of the message, one of the {@link MessageAction} enum values.
+   */
+  action?: MessageAction;
+  /**
+   * This message's unique serial.
+   */
+  serial?: string;
+  /**
+   * The serial of the message that this message is a reference to.
+   */
+  refSerial?: string;
+  /**
+   * The type of reference this message is, in relation to the message it references.
+   */
+  refType?: string;
+  /**
+   * If an `update` operation was applied to this message, this will be the timestamp the update occurred.
+   */
+  updatedAt?: number;
+  /**
+   * If a `deletion` operation was applied to this message, this will be the timestamp the deletion occurred.
+   */
+  deletedAt?: number;
+  /**
+   * If this message resulted from an operation, this will contain the operation details.
+   */
+  operation?: Operation;
 }
 
+/**
+ * Contains the details of an operation, such as update of deletion, supplied by the actioning client.
+ */
+export interface Operation {
+  /**
+   * The client ID of the client that initiated the operation.
+   */
+  clientId?: string;
+  /**
+   * The description provided by the client that initiated the operation.
+   */
+  description?: string;
+  /**
+   * A JSON object of string key-value pairs that may contain metadata associated with the operation.
+   */
+  metadata?: Record<string, string>;
+}
+
+/**
+ * The namespace containing the different types of message actions.
+ */
+declare namespace MessageActions {
+  /**
+   * Message action has not been set.
+   */
+  type MESSAGE_UNSET = 'message_unset';
+  /**
+   * Message action for a newly created message.
+   */
+  type MESSAGE_CREATE = 'message_create';
+  /**
+   * Message action for an updated message.
+   */
+  type MESSAGE_UPDATE = 'message_update';
+  /**
+   * Message action for a deleted message.
+   */
+  type MESSAGE_DELETE = 'message_delete';
+  /**
+   * Message action for a newly created annotation.
+   */
+  type MESSAGE_ANNOTATION_CREATE = 'message_annotation_create';
+  /**
+   * Message action for a deleted annotation.
+   */
+  type MESSAGE_ANNOTATION_DELETE = 'message_annotation_delete';
+  /**
+   * Message action for a meta-message that contains channel occupancy information.
+   */
+  type MESSAGE_META_OCCUPANCY = 'message_meta_occupancy';
+}
+
+/**
+ * Describes the possible action types used on an {@link Message}.
+ */
+export type MessageAction =
+  | MessageActions.MESSAGE_UNSET
+  | MessageActions.MESSAGE_CREATE
+  | MessageActions.MESSAGE_UPDATE
+  | MessageActions.MESSAGE_DELETE
+  | MessageActions.MESSAGE_ANNOTATION_CREATE
+  | MessageActions.MESSAGE_ANNOTATION_DELETE
+  | MessageActions.MESSAGE_META_OCCUPANCY;
+
 /**
  * A message received from Ably.
  */
-export type InboundMessage = Message & Required<Pick<Message, 'id' | 'timestamp'>>;
+export type InboundMessage = Message & Required<Pick<Message, 'id' | 'timestamp' | 'serial' | 'action'>>;
 
 /**
  * Static utilities related to messages.

src/common/lib/client/realtimechannel.ts

@@ -15,6 +15,8 @@ import Message, {
   getMessagesSize,
   CipherOptions,
   EncodingDecodingContext,
+  messageFromValuesArrayWithAction,
+  messageFromValuesWithAction,
 } from '../types/message';
 import ChannelStateChange from './channelstatechange';
 import ErrorInfo, { PartialErrorInfo } from '../types/errorinfo';
@@ -234,16 +236,17 @@ class RealtimeChannel extends EventEmitter {
       throw this.connectionManager.getError();
     }
     if (argCount == 1) {
-      if (Utils.isObject(messages)) messages = [messageFromValues(messages)];
-      else if (Array.isArray(messages)) messages = messagesFromValuesArray(messages);
+      // setting the action to `message_create` because this is a standard publish
+      if (Utils.isObject(messages)) messages = [messageFromValuesWithAction(messages, 'message_create')];
+      else if (Array.isArray(messages)) messages = messageFromValuesArrayWithAction(messages, 'message_create');
       else
         throw new ErrorInfo(
           'The single-argument form of publish() expects a message object or an array of message objects',
           40013,
           400,
         );
     } else {
-      messages = [messageFromValues({ name: args[0], data: args[1] })];
+      messages = [messageFromValuesWithAction({ name: args[0], data: args[1] }, 'message_create')];
     }
     const maxMessageSize = this.client.options.maxMessageSize;
     await encodeMessagesArray(messages, this.channelOptions as CipherOptions);

src/common/lib/types/defaultmessage.ts

@@ -1,10 +1,11 @@
 import Message, {
   CipherOptions,
-  fromEncoded,
-  fromEncodedArray,
-  encode,
   decode,
+  encode,
   EncodingDecodingContext,
+  fromEncoded,
+  fromEncodedArray,
+  fromValues,
 } from './message';
 import * as API from '../../../../ably';
 import Platform from 'common/platform';
@@ -25,8 +26,8 @@ export class DefaultMessage extends Message {
   }
 
   // Used by tests
-  static fromValues(values: unknown): Message {
-    return Object.assign(new Message(), values);
+  static fromValues(values: Message | Record<string, unknown>, stringifyAction?: boolean): Message {
+    return fromValues(values, stringifyAction);
   }
 
   // Used by tests

src/common/lib/types/message.ts

@@ -9,6 +9,33 @@ import * as API from '../../../../ably';
 import { IUntypedCryptoStatic } from 'common/types/ICryptoStatic';
 import { MsgPack } from 'common/types/msgpack';
 
+const MessageActionArray: API.MessageAction[] = [
+  'message_unset',
+  'message_create',
+  'message_update',
+  'message_delete',
+  'message_annotation_create',
+  'message_annotation_delete',
+  'message_meta_occupancy',
+];
+
+function toMessageActionString(actionNumber: number): API.MessageAction {
+  if (actionNumber in MessageActionArray) {
+    return MessageActionArray[actionNumber];
+  } else {
+    throw new ErrorInfo(`Unsupported action number: ${actionNumber}`, 40000, 400);
+  }
+}
+
+function toMessageActionNumber(messageAction: API.MessageAction): number {
+  for (const [index, value] of MessageActionArray.entries()) {
+    if (value === messageAction) {
+      return index;
+    }
+  }
+  throw new ErrorInfo(`Unsupported action string: ${messageAction}`, 40000, 400);
+}
+
 export type CipherOptions = {
   channelCipher: {
     encrypt: Function;
@@ -82,7 +109,7 @@ export async function fromEncoded(
   encoded: unknown,
   inputOptions?: API.ChannelOptions,
 ): Promise<Message> {
-  const msg = fromValues(encoded);
+  const msg = fromValues(encoded as Message | Record<string, unknown>, true);
   const options = normalizeCipherOptions(Crypto, logger, inputOptions ?? null);
   /* if decoding fails at any point, catch and return the message decoded to
    * the fullest extent possible */
@@ -260,7 +287,7 @@ export async function fromResponseBody(
   }
 
   for (let i = 0; i < body.length; i++) {
-    const msg = (body[i] = fromValues(body[i]));
+    const msg = (body[i] = fromValues(body[i], true));
     try {
       await decode(msg, options);
     } catch (e) {
@@ -270,14 +297,46 @@ export async function fromResponseBody(
   return body;
 }
 
-export function fromValues(values: unknown): Message {
+/**
+ * This is used to return a new message with a given action type set.
+ * @param values - This is a message-like object, with the values to be set on the new message object.
+ * @param action - This is the action type that will be applied to the message
+ * @returns {Message} - This is a new message, with the provided action type set.
+ * @throws {ErrorInfo} - If the action type is not supported.
+ */
+export function messageFromValuesWithAction(
+  values: Message | Record<string, unknown>,
+  action: API.MessageAction,
+): Message {
+  values.action = toMessageActionNumber(action);
+  return fromValues(values);
+}
+
+/**
+ * This is used to return an array of new messages, each set with the provided action type.
+ * It will apply the same action type to ALL messages.
+ * @param values - This is the array of message-like objects, with the values to be set on the new messages.
+ * @param action - This is the action type, applied to each message in the array.
+ * @returns {Message[]} - This is an array of new messages, each with the provided action type set.
+ */
+export function messageFromValuesArrayWithAction(values: unknown[], action: API.MessageAction): Message[] {
+  const count = values.length,
+    result = new Array(count);
+  for (let i = 0; i < count; i++) result[i] = messageFromValuesWithAction(values[i] as Record<string, unknown>, action);
+  return result;
+}
+
+export function fromValues(values: Message | Record<string, unknown>, stringifyAction?: boolean): Message {
+  if (stringifyAction) {
+    values.action = toMessageActionString(values.action as number);
+  }
   return Object.assign(new Message(), values);
 }
 
 export function fromValuesArray(values: unknown[]): Message[] {
   const count = values.length,
     result = new Array(count);
-  for (let i = 0; i < count; i++) result[i] = fromValues(values[i]);
+  for (let i = 0; i < count; i++) result[i] = fromValues(values[i] as Record<string, unknown>, true);
   return result;
 }
 
@@ -304,6 +363,13 @@ class Message {
   encoding?: string | null;
   extras?: any;
   size?: number;
+  action?: API.MessageAction | number;
+  serial?: string;
+  refSerial?: string;
+  refType?: string;
+  updatedAt?: number;
+  deletedAt?: number;
+  operation?: API.Operation;
 
   /**
    * Overload toJSON() to intercept JSON.stringify()
@@ -334,6 +400,14 @@ class Message {
       connectionId: this.connectionId,
       connectionKey: this.connectionKey,
       extras: this.extras,
+      serial: this.serial,
+      // If `action` has not been set, it will be set once received by realtime
+      action: this.action ? toMessageActionNumber(this.action as API.MessageAction) : 0,
+      refSerial: this.refSerial,
+      refType: this.refType,
+      updatedAt: this.updatedAt,
+      deletedAt: this.deletedAt,
+      operation: this.operation,
       encoding,
       data,
     };
@@ -355,6 +429,14 @@ class Message {
       else result += '; data (json)=' + JSON.stringify(this.data);
     }
     if (this.extras) result += '; extras=' + JSON.stringify(this.extras);
+
+    if (this.action) result += '; action=' + this.action;
+    if (this.serial) result += '; serial=' + this.serial;
+    if (this.refSerial) result += '; refSerial=' + this.refSerial;
+    if (this.refType) result += '; refType=' + this.refType;
+    if (this.updatedAt) result += '; updatedAt=' + this.updatedAt;
+    if (this.deletedAt) result += '; deletedAt=' + this.deletedAt;
+    if (this.operation) result += '; operation=' + JSON.stringify(this.operation);
     result += ']';
     return result;
   }