save data to sqlite

.gitignore

@@ -1,6 +1,7 @@
 # compiled output
 /dist
 /node_modules
+*.sqlite
 
 # Logs
 logs
@@ -32,4 +33,4 @@ lerna-debug.log*
 !.vscode/settings.json
 !.vscode/tasks.json
 !.vscode/launch.json
-!.vscode/extensions.json
+!.vscode/extensions.json

package.json

@@ -25,9 +25,12 @@
     "@nestjs/core": "^10.0.0",
     "@nestjs/platform-express": "^10.0.0",
     "@nestjs/schedule": "^3.0.3",
+    "@nestjs/typeorm": "^10.0.0",
     "cache-manager": "^5.2.3",
     "reflect-metadata": "^0.1.13",
     "rxjs": "^7.8.1",
+    "sqlite3": "^5.1.6",
+    "typeorm": "^0.3.17",
     "usb": "^2.10.0"
   },
   "devDependencies": {

src/app.module.ts

@@ -1,10 +1,24 @@
 import { Module } from '@nestjs/common';
+import { ScheduleModule } from '@nestjs/schedule';
 import { AppController } from './app.controller';
 import { AppService } from './app.service';
 import { CacheModule } from '@nestjs/cache-manager';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { join } from 'path';
+import { WeatherEntity } from './entities/weather.entity';
 
 @Module({
-  imports: [CacheModule.register()],
+  imports: [
+    CacheModule.register(),
+    TypeOrmModule.forRoot({
+      type: 'sqlite',
+      database: join(process.cwd(), 'data.sqlite'),
+      entities: [WeatherEntity],
+      synchronize: true,
+    }),
+    TypeOrmModule.forFeature([WeatherEntity]),
+    ScheduleModule.forRoot(),
+  ],
   controllers: [AppController],
   providers: [AppService],
 })

src/app.service.ts

@@ -1,13 +1,70 @@
-import { Injectable, OnApplicationShutdown } from '@nestjs/common';
+import {
+  Injectable,
+  InternalServerErrorException,
+  Logger,
+  OnApplicationShutdown,
+} from '@nestjs/common';
 import WS1080 from './module/ws1080';
+import { Repository } from 'typeorm';
+import { WeatherEntity } from './entities/weather.entity';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Cron } from '@nestjs/schedule';
 
 @Injectable()
 export class AppService implements OnApplicationShutdown {
+  private logger = new Logger(AppService.name);
   public station?: WS1080;
 
+  constructor(
+    @InjectRepository(WeatherEntity)
+    private readonly weatherRepository: Repository<WeatherEntity>,
+  ) {}
+
   async getWeather() {
-    if (!this.station) this.station = WS1080.fromDevice();
-    return this.station.read();
+    try {
+      // Retrieve from USB
+      if (!this.station) this.station = WS1080.fromDevice();
+      const data = await this.station.read();
+
+      // Save weather data to database
+      const entity = this.weatherRepository.create({
+        date: new Date(),
+        ...data,
+      });
+
+      await this.weatherRepository.save(entity);
+      entity.fresh = true;
+
+      return entity;
+    } catch (error) {
+      // USB errors likely mean we are not connected anymore
+      if (error.message?.includes('USB')) {
+        try {
+          this.station?.close();
+        } catch {}
+        this.station = null;
+      }
+
+      this.logger.error('Failed to retrieve weather data:', error.stack);
+
+      // Retrieve previous entry on error
+      const [previous] = await this.weatherRepository.find({
+        order: { date: -1 },
+        take: 1,
+      });
+
+      if (!previous) throw new InternalServerErrorException();
+
+      previous.fresh = false;
+      return previous;
+    }
+  }
+
+  @Cron('0 * * * *')
+  scheduledPulls() {
+    this.getWeather().catch(() => {
+      // do nothing
+    });
   }
 
   onApplicationShutdown() {

src/entities/weather.entity.ts

@@ -0,0 +1,48 @@
+import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm';
+
+@Entity()
+export class WeatherEntity {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ type: Date })
+  date: Date;
+
+  @Column({ nullable: true })
+  indoorHumidity: number;
+
+  @Column({ nullable: true })
+  outdoorHumidity: number;
+
+  @Column({ nullable: true })
+  indoorTemperature: number;
+
+  @Column({ nullable: true })
+  outdoorTemperature: number;
+
+  @Column({ nullable: true })
+  outdoorDewPoint: number;
+
+  @Column({ nullable: true })
+  windChillTemp: number;
+
+  @Column({ nullable: true })
+  windSpeed: number;
+
+  @Column({ nullable: true })
+  gustSpeed: number;
+
+  @Column({ nullable: true })
+  windDirection: string;
+
+  @Column({ nullable: true })
+  rainDiff: number;
+
+  @Column({ nullable: true })
+  totalRain: number;
+
+  @Column({ nullable: true })
+  absPressure: number;
+
+  fresh?: boolean;
+}