send and receive message

src/app/module/chat/data/data-source/message/message-local-data-source.service.ts

@@ -0,0 +1,139 @@
+import { Injectable } from '@angular/core';
+import { Dexie, EntityTable, liveQuery } from 'Dexie';
+import { err, ok } from 'neverthrow';
+import { z } from 'zod';
+import { from, Observable, Subject } from 'rxjs';
+import { filter, switchMap } from 'rxjs/operators';
+import { MessageInputDTO } from '../../dto/message/messageInputDtO';
+
+
+const tableSchema = z.object({
+  id: z.any().optional(),
+  messageId: z.string().optional(),
+  roomId: z.string().uuid(),
+  senderId: z.number(),
+  message: z.string(),
+  messageType: z.number(),
+  canEdit: z.boolean(),
+  oneShot: z.boolean(),
+  sentAt: z.string().optional(),
+  requireUnlock: z.boolean(),
+  sender: z.object({
+    wxUserId: z.number(),
+    wxFullName: z.string(),
+    wxeMail: z.string(),
+    userPhoto: z.string(),
+  }),
+  sending: z.boolean().optional()
+})
+
+
+export type TableMessage = z.infer<typeof tableSchema>
+
+// Database declaration (move this to its own module also)
+export const messageDataSource = new Dexie('chat-message') as Dexie & {
+  message: EntityTable<TableMessage, 'id'>;
+};
+
+messageDataSource.version(1).stores({
+  message: '++id, roomId, senderId, message, messageType, canEdit, oneShot, requireUnlock, messageId'
+});
+
+@Injectable({
+  providedIn: 'root'
+})
+export class MessageLocalDataSourceService {
+
+  messageSubject = new Subject();
+
+  constructor() {
+
+    messageDataSource.message.hook('creating', (primKey, obj, trans) => {
+      // const newMessage = await trans.table('message').get(primKey);
+      this.messageSubject.next(obj);
+      // return newMessage
+    })
+  }
+
+
+  async sendMessage(data: MessageInputDTO) {
+
+    (data as TableMessage).sending = true
+
+    try {
+      const result = await messageDataSource.message.add(data)
+      return ok(result as string)
+    } catch (e) {
+      return err(false)
+    }
+
+  }
+
+
+  async createMessage(data: MessageInputDTO) {
+
+    try {
+      const result = await messageDataSource.message.add(data)
+      return ok(result as string)
+    } catch (e) {
+      return err(false)
+    }
+
+  }
+
+
+  async update(data: TableMessage ) {
+
+    try {
+      const result = await messageDataSource.message.update(data.id, data)
+      return ok(result)
+    } catch (e) {
+      return err(false)
+    }
+
+  }
+
+
+  async findOrUpdate(data: TableMessage) {
+    const findResult = await this.findMessageById(data.messageId)
+
+    if(findResult.isOk()) {
+      return this.update({...findResult.value, ...data})
+    } else  {
+      return this.createMessage(data)
+    }
+  }
+
+  getItemsLive(roomId: string) {
+    return liveQuery(() =>
+      messageDataSource.message.where('roomId').equals(roomId).sortBy('id')
+    )
+  }
+
+
+  async findMessageById(messageId: string) {
+    try {
+      const a = await messageDataSource.message.where('messageId').equals(messageId).first()
+
+      if(a) {
+        return ok(a)
+      } else {
+        return err('not found')
+      }
+
+    } catch (e) {
+      return err('DB error')
+    }
+
+  }
+
+
+  subscribeToNewMessage(roomId: string): Observable<TableMessage>  {
+    return this.messageSubject.pipe(
+      filter((message: TableMessage) =>
+        message.roomId === roomId
+      )
+    )
+  }
+}
+