Organize files

data/printers.json

@@ -0,0 +1,7 @@
+[
+  { "name": "p04", "ip": "10.7.0.134", "model": "m3655idn" },
+  { "name": "p05", "ip": "10.7.0.135", "model": "m2040dn" },
+  { "name": "p06", "ip": "10.7.0.136", "model": "m2040dn" },
+  { "name": "p07", "ip": "10.7.0.137", "model": "m2040dn" },
+  { "name": "p08", "ip": "10.7.0.138", "model": "p6235cdn" }
+]

package.json

@@ -8,7 +8,7 @@
     "clean": "rimraf ./dist",
     "build": "npm run clean && tsc",
     "start": "node src",
-    "dev": "nodemon --ext js,ts,mts,mjs ./src/index.ts --exec ts-node-esm"
+    "dev": "nodemon --ext js,ts,mts,mjs,json ./src/index.ts --exec ts-node-esm"
   },
   "keywords": [],
   "author": "",

src/Printer.mts

@@ -1,76 +1,14 @@
 import {
   PrinterInfo,
   PrinterModel,
-  PrinterObjectIDConfig,
   PrinterObjectIDs,
   Varbind,
   VarbindString
 } from './types.mjs'
 
-import snmp from 'net-snmp'
+import { printerObjectIDConfigs } from './printerObjectIDConfigs.mjs'
 
-const printerObjectIDConfigs: PrinterObjectIDConfig[] = [
-  {
-    model: 'm3655idn',
-    objectIds: {
-      model: '1.3.6.1.2.1.25.3.2.1.3.1',
-      serial: '1.3.6.1.2.1.43.5.1.1.17.1',
-      counter: '1.3.6.1.4.1.1347.43.10.1.1.12.1.1',
-      toners: {
-        black: {
-          current: '1.3.6.1.2.1.43.11.1.1.9.1.1',
-          max: '1.3.6.1.2.1.43.11.1.1.8.1.1',
-          model: '1.3.6.1.2.1.43.11.1.1.6.1.1'
-        }
-      }
-    }
-  },
-  {
-    model: 'p6235cdn',
-    objectIds: {
-      model: '1.3.6.1.2.1.25.3.2.1.3.1',
-      serial: '1.3.6.1.2.1.43.5.1.1.17.1',
-      counter: '1.3.6.1.4.1.1347.43.10.1.1.12.1.1',
-      toners: {
-        black: {
-          current: '1.3.6.1.2.1.43.11.1.1.9.1.4',
-          max: '1.3.6.1.2.1.43.11.1.1.8.1.4',
-          model: '1.3.6.1.2.1.43.11.1.1.6.1.4'
-        },
-        cyan: {
-          current: '1.3.6.1.2.1.43.11.1.1.9.1.1',
-          max: '1.3.6.1.2.1.43.11.1.1.8.1.1',
-          model: '1.3.6.1.2.1.43.11.1.1.6.1.1'
-        },
-        magenta: {
-          current: '1.3.6.1.2.1.43.11.1.1.9.1.2',
-          max: '1.3.6.1.2.1.43.11.1.1.8.1.2',
-          model: '1.3.6.1.2.1.43.11.1.1.6.1.2'
-        },
-        yellow: {
-          current: '1.3.6.1.2.1.43.11.1.1.9.1.3',
-          max: '1.3.6.1.2.1.43.11.1.1.8.1.3',
-          model: '1.3.6.1.2.1.43.11.1.1.6.1.3'
-        }
-      }
-    }
-  },
-  {
-    model: 'm2040dn',
-    objectIds: {
-      model: '1.3.6.1.2.1.25.3.2.1.3.1',
-      serial: '1.3.6.1.2.1.43.5.1.1.17.1',
-      counter: '1.3.6.1.4.1.1347.43.10.1.1.12.1.1',
-      toners: {
-        black: {
-          current: '1.3.6.1.2.1.43.11.1.1.9.1.1',
-          max: '1.3.6.1.2.1.43.11.1.1.8.1.1',
-          model: '1.3.6.1.2.1.43.11.1.1.6.1.1'
-        }
-      }
-    }
-  }
-]
+import snmp from 'net-snmp'
 
 export class Printer {
   constructor(name: string, ip: string, model: PrinterModel) {
@@ -205,14 +143,14 @@ export class Printer {
   }
 
   async getPrinterInfo(): Promise<PrinterInfo> {
-    const session = snmp.createSession(this.ip, 'public')
-
     return new Promise((resolve, reject) => {
+      const session = snmp.createSession(this.ip, 'public')
       session.get(this.oIDsArray(), (error, varbinds) => {
         const varbindsString = this.deBufferizeVarbinds(varbinds)
         const info = this.objectIDsToPrinterInfo(varbindsString)
 
         resolve(info)
+        session.close()
       })
     })
   }

src/PrinterRepository.mts

@@ -0,0 +1,46 @@
+import { Printer } from './Printer.mjs'
+import fs from 'fs'
+
+export class PrinterRepository {
+  constructor() {
+    if (PrinterRepository.instance) return PrinterRepository.instance
+
+    this.loadFromJSON()
+    PrinterRepository.instance = this
+  }
+
+  private printers: Printer[] = []
+  static instance: PrinterRepository
+
+  loadFromJSON() {
+    const json = JSON.parse(fs.readFileSync('./data/printers.json', 'utf8'))
+    this.printers = json.map(
+      ({ name, ip, model }: Printer) => new Printer(name, ip, model)
+    )
+  }
+
+  saveToJSON() {
+    const json = JSON.stringify(this.printers)
+    fs.writeFileSync('./data/printers.json', json, 'utf8')
+  }
+
+  addPrinter(printer) {
+    this.printers.push(printer)
+    this.saveToJSON()
+  }
+
+  removePrinter(printerName) {
+    this.printers = this.printers.filter(
+      printer => printer.name !== printerName
+    )
+    this.saveToJSON()
+  }
+
+  getPrinter(printerName) {
+    return this.printers.find(printer => printer.name === printerName)
+  }
+
+  getAllPrinters() {
+    return this.printers
+  }
+}

src/index.ts

@@ -1,16 +1,19 @@
 import express from 'express'
-import { printersDB } from './printers.mjs'
+
 import { Printer } from './Printer.mjs'
 import { PrinterInfo } from './types.mjs'
+import fs from 'fs'
 
 const app = express()
 const port = 3000
 
+const printersDB = JSON.parse(fs.readFileSync('./data/printers.json', 'utf8'))
+
 const printers: Printer[] = printersDB.map(
   printer => new Printer(printer.name, printer.ip, printer.model)
 )
 
-app.get('/', async (req, res) => {
+app.get('/api/printer', async (req, res) => {
   const printersInfo: PrinterInfo[] = await Promise.all(
     printers.map(printer => printer.getPrinterInfo())
   )
@@ -18,7 +21,7 @@ app.get('/', async (req, res) => {
   res.send(printersInfo)
 })
 
-app.get('/:printerName', async (req, res) => {
+app.get('/api/printer/:printerName', async (req, res) => {
   const printerName = req.params.printerName
   const printer = printers.find(printer => printer.name === printerName)
 

src/printerObjectIDConfigs.mts

@@ -0,0 +1,64 @@
+import { PrinterObjectIDConfig } from './types.mjs'
+
+export const printerObjectIDConfigs: PrinterObjectIDConfig[] = [
+  {
+    model: 'm3655idn',
+    objectIds: {
+      model: '1.3.6.1.2.1.25.3.2.1.3.1',
+      serial: '1.3.6.1.2.1.43.5.1.1.17.1',
+      counter: '1.3.6.1.4.1.1347.43.10.1.1.12.1.1',
+      toners: {
+        black: {
+          current: '1.3.6.1.2.1.43.11.1.1.9.1.1',
+          max: '1.3.6.1.2.1.43.11.1.1.8.1.1',
+          model: '1.3.6.1.2.1.43.11.1.1.6.1.1'
+        }
+      }
+    }
+  },
+  {
+    model: 'p6235cdn',
+    objectIds: {
+      model: '1.3.6.1.2.1.25.3.2.1.3.1',
+      serial: '1.3.6.1.2.1.43.5.1.1.17.1',
+      counter: '1.3.6.1.4.1.1347.43.10.1.1.12.1.1',
+      toners: {
+        black: {
+          current: '1.3.6.1.2.1.43.11.1.1.9.1.4',
+          max: '1.3.6.1.2.1.43.11.1.1.8.1.4',
+          model: '1.3.6.1.2.1.43.11.1.1.6.1.4'
+        },
+        cyan: {
+          current: '1.3.6.1.2.1.43.11.1.1.9.1.1',
+          max: '1.3.6.1.2.1.43.11.1.1.8.1.1',
+          model: '1.3.6.1.2.1.43.11.1.1.6.1.1'
+        },
+        magenta: {
+          current: '1.3.6.1.2.1.43.11.1.1.9.1.2',
+          max: '1.3.6.1.2.1.43.11.1.1.8.1.2',
+          model: '1.3.6.1.2.1.43.11.1.1.6.1.2'
+        },
+        yellow: {
+          current: '1.3.6.1.2.1.43.11.1.1.9.1.3',
+          max: '1.3.6.1.2.1.43.11.1.1.8.1.3',
+          model: '1.3.6.1.2.1.43.11.1.1.6.1.3'
+        }
+      }
+    }
+  },
+  {
+    model: 'm2040dn',
+    objectIds: {
+      model: '1.3.6.1.2.1.25.3.2.1.3.1',
+      serial: '1.3.6.1.2.1.43.5.1.1.17.1',
+      counter: '1.3.6.1.4.1.1347.43.10.1.1.12.1.1',
+      toners: {
+        black: {
+          current: '1.3.6.1.2.1.43.11.1.1.9.1.1',
+          max: '1.3.6.1.2.1.43.11.1.1.8.1.1',
+          model: '1.3.6.1.2.1.43.11.1.1.6.1.1'
+        }
+      }
+    }
+  }
+]

src/printers.mts

@@ -1,29 +0,0 @@
-import { Printer } from './types.mjs'
-
-export const printersDB: Printer[] = [
-  {
-    name: 'p04',
-    ip: '10.7.0.134',
-    model: 'm3655idn'
-  },
-  {
-    name: 'p05',
-    ip: '10.7.0.135',
-    model: 'm2040dn'
-  },
-  {
-    name: 'p06',
-    ip: '10.7.0.136',
-    model: 'm2040dn'
-  },
-  {
-    name: 'p07',
-    ip: '10.7.0.137',
-    model: 'm2040dn'
-  },
-  {
-    name: 'p08',
-    ip: '10.7.0.138',
-    model: 'p6235cdn'
-  }
-]