Isolated scopes for each http request

[Loskir]

I'm using Sentry with koa framework.
What do I do to make each request have its own isolated scope? So I can set some request-specific tags that shouldn't be visible in other requests.

I can't use pushScope because there can be a race condition that results in data from one request being leaked to other requests.

I tried creating separate Hubs for each request, but that's not an elegant solution, and besides, the console breadcrumbs broke.

I tried creating a cloned Scope for each request using Scope.clone(Sentry.getCurrentHub().getScope()) and then passing it in captureException like Sentry.captureException(error, scope). It works fine, but I discovered that Event Processors are not executed for some reason and metadata from the koa request is not added.

On this page I saw an example that used the domain module of node. I haven't tried it, but I suppose that it does something similar to what I'm trying to achieve. The problem is that this module is deprecated and I don't quite fancy these magic "domains". I'd rather have a plain variable with current scope and pass it back and forth.

Any other solutions? Best practices?

[AbhiPrasad]

Hey! We recommend using domains. Although it's deprecated, it works quite well and is the foundation of our various server side integrations - it should work ootb with the SDK as well. See our usage in express:

sentry-javascript/packages/node/src/handlers.ts

Line 158 in ccc51f3

local.run(() => {

.

Eventually we'll make the switch to async hooks: https://nodejs.org/api/async_hooks.html - but since we have to support Node 8, we're stuck with domains for now.