counter8/index.js

Counter8 allows you to create and update counters directly from the command line or other Node.js scripts.

const fs = require("fs").promises;
const lockfile = require("proper-lockfile");

class Counter {
   constructor(name) {
      this.name = name;
      this.path = `./${name}.txt`;
   }

   async add(value) {
    try {
        const release = await lockfile.lock(this.path);
        const currentValue = parseInt(await fs.readFile(this.path, "utf8"));
        // Convert value to a number before performing the addition
       const numvalue = Number(value)
        const newValue = currentValue + numvalue;
        await fs.writeFile(this.path, newValue.toString(), "utf8");
        release(); // Release the lock
        console.log(`Counter ${this.name} updated to ${newValue}.`);
    } catch (error) {
        console.error(
           `Failed to update counter ${this.name}: ${error.message}`,
        );
        throw error;
    }
   }


   static async new(name) {
      const counter = new Counter(name);
      try {
         await fs.access(counter.path);
         console.log(`Counter ${name} already exists.`);
         return counter;
      } catch (error) {
         if (error.code === "ENOENT") {
            await fs.writeFile(counter.path, "0", { flag: "wx" });
            console.log(`Counter ${name} created successfully.`);
            return counter;
         } else {
            console.error(`Failed to access counter ${name}: ${error.message}`);
            throw error;
         }
      }
   }

   async get(name) {
      try {
         const nameCounter = new Counter(name); // Use 'new' keyword to create a new instance
         return nameCounter;
      } catch (err) {
         console.error(`Failed to get counter ${name}: ${err.message}`);
      }
   }
}

module.exports = Counter;