Build an Idempotent API in Node.js with Redis

• idempotency-with-redis

  1 0 3.8 JavaScript

  Showcases idempotent Node.js/Express.js API with Redis locks

To understand the problem and get to a working solution, our journey will include a sample Node.js API 👇:

• node-redlock

  2 1,729 3.7 TypeScript

  A node.js redlock implementation for distributed, highly-available redis locks

async function create(req, res) { let lock; try { // Try to acquire the lock lock = await service.urlService.acquireLock( "URL:CREATE:ExclusiveLock", 100 ); const { longURL } = req.body; // Check if the mapping already exists const mapping = await service.urlService.findByLongURL(longURL); if (mapping) { return res.status(HTTP_STATUS_CODES.SUCCESS).json({ status: true, message: "Short slug created successfully", data: { slug: mapping.slug }, }); } // New long URL, generate a new and unique slug const slug = service.urlService.generateNewSlug(); // save short URL <> long URL mapping to the database await service.urlService.saveToDB(slug, longURL); // Return the newly generated short slug return res.status(HTTP_STATUS_CODES.SUCCESS).json({ status: true, message: "Short slug created successfully", data: { slug }, }); } catch (err) { return res.status(HTTP_STATUS_CODES.INTERNAL_SERVER_ERROR).json({ status: false, message: "Could not create short slug", error: err, }); } finally { /** * Manually release the lock when the operation is complete * * NOTE: Redlock's release method is not a no-op, it throws an error if you try to release an already expired lock ([more here](https://github.com/mike-marcacci/node-redlock/issues/168#issuecomment-1165700540)). Setting a small TTL usually triggers this unexpected behavior. * As a workaround, we're ignoring the errors from lock.release() */ if (lock) await lock.release().catch(() => {}); } }

• SurveyJS

  surveyjs.io featured

  Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.

  

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