feat: add monitor manager and runner

package.json

@@ -48,6 +48,7 @@
     "openbadge": "^1.0.4",
     "passport": "^0.6.0",
     "passport-jwt": "^4.0.1",
+    "ping": "^0.4.4",
     "pretty-ms": "7.0.1",
     "react": "^18.2.0",
     "react-dom": "^18.2.0",
@@ -76,6 +77,7 @@
     "@types/nodemailer": "^6.4.11",
     "@types/passport": "^1.0.12",
     "@types/passport-jwt": "^3.0.9",
+    "@types/ping": "^0.4.2",
     "@types/react": "^18.2.21",
     "@types/react-dom": "^18.2.7",
     "@types/request-ip": "^0.0.38",

pnpm-lock.yaml

@@ -106,6 +106,9 @@ dependencies:
   passport-jwt:
     specifier: ^4.0.1
     version: 4.0.1
+  ping:
+    specifier: ^0.4.4
+    version: 0.4.4
   pretty-ms:
     specifier: 7.0.1
     version: 7.0.1
@@ -186,6 +189,9 @@ devDependencies:
   '@types/passport-jwt':
     specifier: ^3.0.9
     version: 3.0.9
+  '@types/ping':
+    specifier: ^0.4.2
+    version: 0.4.2
   '@types/react':
     specifier: ^18.2.21
     version: 18.2.21
@@ -2074,6 +2080,10 @@ packages:
       '@types/express': 4.17.17
     dev: true
 
+  /@types/ping@0.4.2:
+    resolution: {integrity: sha512-5WAzkazMQP7EBDfGtfOV8Tkh7SoXhyo8UYXsR7G7RCRihyM5Ds2zbxgrS+eI0bMqL/GPRO7FcJCK7czoxQmXNw==}
+    dev: true
+
   /@types/prop-types@15.7.5:
     resolution: {integrity: sha512-JCB8C6SnDoQf0cNycqd/35A7MjcnK+ZTqE7judS6o7utxUCg6imJg3QK2qzHKszlTjcj2cn+NwMB2i96ubpj7w==}
 
@@ -4381,6 +4391,11 @@ packages:
     engines: {node: '>=0.10.0'}
     dev: true
 
+  /ping@0.4.4:
+    resolution: {integrity: sha512-56ZMC0j7SCsMMLdOoUg12VZCfj/+ZO+yfOSjaNCRrmZZr6GLbN2X/Ui56T15dI8NhiHckaw5X2pvyfAomanwqQ==}
+    engines: {node: '>=4.0.0'}
+    dev: false
+
   /pirates@4.0.6:
     resolution: {integrity: sha512-saLsH7WeYYPiD25LDuLRRY/i+6HaPYr6G1OUlN39otzkSTxKnubR9RTxS3/Kk50s1g2JTgFwWQDQyplC5/SHZg==}
     engines: {node: '>= 6'}

prisma/schema.prisma

@@ -123,7 +123,7 @@ model WebsiteEvent {
   createdAt      DateTime? @default(now()) @db.Timestamptz(6)
 
   eventData WebsiteEventData[]
-  session   WebsiteSession     @relation(fields: [sessionId], references: [id],onUpdate: Cascade, onDelete: Cascade)
+  session   WebsiteSession     @relation(fields: [sessionId], references: [id], onUpdate: Cascade, onDelete: Cascade)
 
   @@index([createdAt])
   @@index([sessionId])
@@ -234,8 +234,9 @@ model Monitor {
   type          String    @db.VarChar(100)
   active        Boolean   @default(true) @db.Boolean
   interval      Int       @default(20) @db.Integer
-  maxRetry      Int       @default(0) @db.Integer
-  retryInterval Int       @default(0) @db.Integer
+  // TODO
+  // maxRetry      Int       @default(0) @db.Integer
+  // retryInterval Int       @default(0) @db.Integer
   payload       Json      @db.Json
   createdAt     DateTime? @default(now()) @db.Timestamptz(6)
 
@@ -252,7 +253,7 @@ model MonitorEvent {
   id        String    @id @default(uuid()) @db.Uuid
   message   String    @db.VarChar(500)
   monitorId String    @db.Uuid
-  type String @db.VarChar(100) // Up or Down
+  type      String    @db.VarChar(100) // UP or DOWN
   createdAt DateTime? @default(now()) @db.Timestamptz(6)
 
   monitor Monitor @relation(fields: [monitorId], references: [id], onUpdate: Cascade, onDelete: Cascade)

src/server/main.ts

@@ -14,6 +14,7 @@ import { trpcExpressMiddleware } from './trpc';
 import { initUdpServer } from './udp/server';
 import { createServer } from 'http';
 import { initSocketio } from './ws';
+import { monitorManager } from './model/monitor';
 
 const port = Number(process.env.PORT || 12345);
 
@@ -24,6 +25,8 @@ initUdpServer(port);
 
 initSocketio(httpServer);
 
+monitorManager.startAll();
+
 app.use(compression());
 app.use(express.json());
 app.use(passport.initialize());

src/server/model/monitor/index.ts

@@ -0,0 +1,170 @@
+import { Monitor } from '@prisma/client';
+import { prisma } from '../_client';
+import { monitorProviders } from './provider';
+
+export type MonitorUpsertData = Pick<
+  Monitor,
+  'workspaceId' | 'name' | 'type' | 'interval'
+> & { id?: string; active?: boolean; payload: Record<string, any> };
+
+class MonitorManager {
+  private monitorRunner: Record<string, MonitorRunner> = {};
+  private isStarted = false;
+
+  /**
+   * create or update
+   */
+  async upsert(data: MonitorUpsertData): Promise<Monitor> {
+    let monitor: Monitor;
+    if (data.id) {
+      // update
+      monitor = await prisma.monitor.update({
+        where: {
+          id: data.id,
+        },
+        data: { ...data },
+      });
+
+      return monitor;
+    } else {
+      // create
+      monitor = await prisma.monitor.create({
+        data: { ...data },
+      });
+    }
+
+    if (this.monitorRunner[monitor.id]) {
+      // Stop and remove old
+      this.monitorRunner[monitor.id].stopMonitor();
+      delete this.monitorRunner[monitor.id];
+    }
+
+    const runner = (this.monitorRunner[monitor.id] = new MonitorRunner(
+      monitor
+    ));
+    runner.startMonitor();
+
+    return monitor;
+  }
+
+  /**
+   * Get and start all monitors
+   */
+  async startAll() {
+    if (this.isStarted === true) {
+      console.warn('MonitorManager.startAll should only call once, skipped.');
+      return;
+    }
+
+    this.isStarted = true;
+
+    const monitors = await prisma.monitor.findMany({
+      where: {
+        active: true,
+      },
+    });
+
+    Promise.all(
+      monitors.map(async (m) => {
+        try {
+          const runner = new MonitorRunner(m);
+          this.monitorRunner[m.id] = runner;
+          await runner.startMonitor();
+        } catch (err) {
+          console.error('Start monitor error:', err);
+        }
+      })
+    ).then(() => {
+      console.log('All monitor has been begin.');
+    });
+  }
+}
+
+class MonitorRunner {
+  isStopped = false;
+  timer: NodeJS.Timeout | null = null;
+
+  constructor(public monitor: Monitor) {}
+
+  /**
+   * Start single monitor
+   */
+  async startMonitor() {
+    const monitor = this.monitor;
+    const { type, interval } = monitor;
+
+    const provider = monitorProviders[type];
+    if (!provider) {
+      throw new Error(`Unknown monitor type: ${type}`);
+    }
+
+    let currentStatus: 'UP' | 'DOWN' = 'UP';
+
+    const nextAction = () => {
+      if (this.isStopped === true) {
+        return;
+      }
+
+      this.timer = setTimeout(() => {
+        run();
+      }, interval);
+    };
+
+    async function run() {
+      const value = await provider.run(monitor);
+
+      // check event update
+      if (value < 0 && currentStatus === 'UP') {
+        await prisma.monitorEvent.create({
+          data: {
+            message: `Monitor ${monitor.name} has been down`,
+            monitorId: monitor.id,
+            type: 'DOWN',
+          },
+        });
+      } else if (value > 0 && currentStatus === 'DOWN') {
+        await prisma.monitorEvent.create({
+          data: {
+            message: `Monitor ${monitor.name} has been up`,
+            monitorId: monitor.id,
+            type: 'UP',
+          },
+        });
+      }
+
+      // insert into data
+      await prisma.monitorData.create({
+        data: {
+          monitorId: monitor.id,
+          value,
+        },
+      });
+
+      // Run next loop
+      nextAction();
+    }
+
+    nextAction();
+
+    console.log(`Start monitor ${monitor.name}(${monitor.id})`);
+  }
+
+  stopMonitor() {
+    const monitor = this.monitor;
+
+    this.isStopped = true;
+    if (this.timer) {
+      clearTimeout(this.timer);
+      this.timer = null;
+    }
+
+    console.log(`Stop monitor ${monitor.name}(${monitor.id})`);
+  }
+
+  async restartMonitor() {
+    this.stopMonitor();
+    this.startMonitor();
+  }
+}
+
+export const monitorManager = new MonitorManager();

src/server/model/monitor/provider/index.ts

@@ -0,0 +1,6 @@
+import { ping } from './ping';
+import type { MonitorProvider } from './type';
+
+export const monitorProviders: Record<string, MonitorProvider> = {
+  ping,
+};

src/server/model/monitor/provider/ping.ts

@@ -0,0 +1,48 @@
+import { MonitorProvider } from './type';
+import pingUtils from 'ping';
+
+export const ping: MonitorProvider = {
+  run: async (monitor) => {
+    if (typeof monitor.payload !== 'object') {
+      throw new Error('monitor.payload should be object');
+    }
+
+    const { hostname } = monitor.payload as any;
+
+    const res = await pingAction(hostname);
+
+    if (res === 'unknown') {
+      return -1;
+    }
+
+    return res;
+  },
+};
+
+const isWindows = /^win/.test(process.platform);
+
+function pingAction(hostname: string, packetSize = 56) {
+  return new Promise<number | 'unknown'>((resolve, reject) => {
+    pingUtils.promise
+      .probe(hostname, {
+        min_reply: 1,
+        deadline: 10,
+        packetSize,
+      })
+      .then((res) => {
+        // If ping failed, it will set field to unknown
+        if (res.alive) {
+          resolve(res.time);
+        } else {
+          if (isWindows) {
+            reject(new Error(exports.convertToUTF8(res.output)));
+          } else {
+            reject(new Error(res.output));
+          }
+        }
+      })
+      .catch((err) => {
+        reject(err);
+      });
+  });
+}

src/server/model/monitor/provider/type.ts

@@ -0,0 +1,5 @@
+import { Monitor } from '@prisma/client';
+
+export interface MonitorProvider {
+  run: (monitor: Monitor) => Promise<number>;
+}

src/server/trpc/routers/monitor.ts

@@ -1,6 +1,7 @@
 import { router, workspaceOwnerProcedure, workspaceProcedure } from '../trpc';
 import { prisma } from '../../model/_client';
 import { z } from 'zod';
+import { monitorManager } from '../../model/monitor';
 
 export const monitorRouter = router({
   all: workspaceProcedure.query(async ({ input }) => {
@@ -38,53 +39,22 @@ export const monitorRouter = router({
         type: z.string(),
         active: z.boolean().default(true),
         interval: z.number().int().default(20),
-        maxRetry: z.number().int().default(0),
-        retryInterval: z.number().int().default(0),
         payload: z.object({}).passthrough(),
       })
     )
     .mutation(async ({ input }) => {
-      const {
-        id,
-        workspaceId,
-        name,
-        type,
-        active,
-        interval,
-        maxRetry,
-        retryInterval,
-        payload,
-      } = input;
+      const { id, workspaceId, name, type, active, interval, payload } = input;
 
-      if (id) {
-        return prisma.monitor.update({
-          data: {
-            name,
-            type,
-            active,
-            interval,
-            maxRetry,
-            retryInterval,
-            payload,
-          },
-          where: {
+      const monitor = await monitorManager.upsert({
         id,
         workspaceId,
-          },
-        });
-      } else {
-        return prisma.monitor.create({
-          data: {
-            workspaceId,
         name,
         type,
         active,
         interval,
-            maxRetry,
-            retryInterval,
         payload,
-          },
       });
-      }
+
+      return monitor;
     }),
 });