Implement LiveObjects pool init from state SYNC sequence

Resolves DTP-949

src/plugins/liveobjects/liveobjects.ts

@@ -37,6 +37,13 @@ export class LiveObjects {
     return this._liveObjectsPool;
   }
 
+  /**
+   * @internal
+   */
+  getChannel(): RealtimeChannel {
+    return this._channel;
+  }
+
   /**
    * @internal
    */
@@ -53,7 +60,7 @@ export class LiveObjects {
       this._startNewSync(syncId, syncCursor);
     }
 
-    // TODO: delegate state messages to _syncLiveObjectsDataPool and create new live and data objects
+    this._syncLiveObjectsDataPool.applyStateMessages(stateMessages);
 
     // if this is the last (or only) message in a sequence of sync updates, end the sync
     if (!syncCursor) {

src/plugins/liveobjects/syncliveobjectsdatapool.ts

@@ -1,6 +1,10 @@
+import type BaseClient from 'common/lib/client/baseclient';
+import RealtimeChannel from 'common/lib/client/realtimechannel';
+import { LiveCounterData } from './livecounter';
+import { LiveMapData, MapEntry, ObjectIdStateData, StateData, ValueStateData } from './livemap';
 import { LiveObjectData } from './liveobject';
 import { LiveObjects } from './liveobjects';
-import { MapSemantics } from './statemessage';
+import { MapSemantics, StateMessage, StateObject } from './statemessage';
 
 export interface LiveObjectDataEntry {
   objectData: LiveObjectData;
@@ -24,9 +28,13 @@ export type AnyDataEntry = LiveCounterDataEntry | LiveMapDataEntry;
  * @internal
  */
 export class SyncLiveObjectsDataPool {
+  private _client: BaseClient;
+  private _channel: RealtimeChannel;
   private _pool: Map<string, AnyDataEntry>;
 
   constructor(private _liveObjects: LiveObjects) {
+    this._client = this._liveObjects.getClient();
+    this._channel = this._liveObjects.getChannel();
     this._pool = new Map<string, AnyDataEntry>();
   }
 
@@ -45,4 +53,84 @@ export class SyncLiveObjectsDataPool {
   reset(): void {
     this._pool = new Map<string, AnyDataEntry>();
   }
+
+  applyStateMessages(stateMessages: StateMessage[]): void {
+    for (const stateMessage of stateMessages) {
+      if (!stateMessage.object) {
+        this._client.Logger.logAction(
+          this._client.logger,
+          this._client.Logger.LOG_MAJOR,
+          'LiveObjects.SyncLiveObjectsDataPool.applyStateMessages()',
+          `state message is received during SYNC without 'object' field, skipping message; message id: ${stateMessage.id}, channel: ${this._channel.name}`,
+        );
+        continue;
+      }
+
+      const stateObject = stateMessage.object;
+
+      if (stateObject.counter) {
+        this._pool.set(stateObject.objectId, this._createLiveCounterDataEntry(stateObject));
+      } else if (stateObject.map) {
+        this._pool.set(stateObject.objectId, this._createLiveMapDataEntry(stateObject));
+      } else {
+        this._client.Logger.logAction(
+          this._client.logger,
+          this._client.Logger.LOG_MINOR,
+          'LiveObjects.SyncLiveObjectsDataPool.applyStateMessages()',
+          `received unsupported state object message during SYNC, expected 'counter' or 'map' to be present; message id: ${stateMessage.id}, channel: ${this._channel.name}`,
+        );
+      }
+    }
+  }
+
+  private _createLiveCounterDataEntry(stateObject: StateObject): LiveCounterDataEntry {
+    const counter = stateObject.counter!;
+
+    const objectData: LiveCounterData = {
+      data: counter.count ?? 0,
+    };
+    const newEntry: LiveCounterDataEntry = {
+      created: counter.created,
+      objectData,
+      objectType: 'LiveCounter',
+      regionalTimeserial: stateObject.regionalTimeserial,
+    };
+
+    return newEntry;
+  }
+
+  private _createLiveMapDataEntry(stateObject: StateObject): LiveMapDataEntry {
+    const map = stateObject.map!;
+
+    const objectData: LiveMapData = {
+      data: new Map<string, MapEntry>(),
+    };
+    // need to iterate over entries manually to work around optional parameters from state object entries type
+    Object.entries(map.entries ?? {}).forEach(([key, entryFromMessage]) => {
+      let liveData: StateData;
+      if (typeof entryFromMessage.data.objectId !== 'undefined') {
+        liveData = { objectId: entryFromMessage.data.objectId } as ObjectIdStateData;
+      } else {
+        liveData = { encoding: entryFromMessage.data.encoding, value: entryFromMessage.data.value } as ValueStateData;
+      }
+
+      const liveDataEntry: MapEntry = {
+        ...entryFromMessage,
+        // true only if we received explicit true. otherwise always false
+        tombstone: entryFromMessage.tombstone === true,
+        data: liveData,
+      };
+
+      objectData.data.set(key, liveDataEntry);
+    });
+
+    const newEntry: LiveMapDataEntry = {
+      objectData,
+      objectType: 'LiveMap',
+      regionalTimeserial: stateObject.regionalTimeserial,
+      semantics: map.semantics ?? MapSemantics.LWW,
+    };
+
+    return newEntry;
+  }
 }