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fix(astro, cloudflare): Run the Cloudflare SDK on the server for Cloudflare Pages (#26188)
This PR addresses a few issues I found while investigating some comments
on #25999
### CF Pages runs the browser SDK on the server
This means it will immediately crash if we ship anything that assumes a
server-side SDK is being used, this showed up when I tried to use the
`serveTunnelIntegration` on the other PR, it doesn't exist on the client
SDKs.
This happens because we do not have an `exports` condition for
`worker/workerd` like other SDKs. So `@sentry/astro` resolves to
`index.client.js`.
```js
// @sentry/astro exports["."]: no workerd entry, so workerd falls through to the client build
{ "node": "./build/esm/index.server.js", "browser": "./build/esm/index.client.js", "import": "./build/esm/index.client.js" }
// @astrojs/cloudflare v12 SSR resolve conditions: no "node"
vite.ssr.resolve.conditions.push("workerd", "worker");
```
We had no E2E apps covering this so it never came up, also it doesn't
happen while using `withSentry`. But a user trying to call `Sentry.init`
from `@sentry/astro` will trigger the bug.
I fixed this by adding a new `workerd/worker` export conditions that
point to a new `index.worker.ts`, which rexports the cloudflare SDK and
uses the `init` from there.
There is a different way to fix it via vite plugins, but I preferred the
more "standard" way here.
---
### Cloudflare Client Events are dropped if `withSentry` is not used
This showed up while testing the first issue, the tests were timing out.
This is because in CF pages, the `withSentry` wrapper is never used so
our sends were never registered with `waitUntil`, so the `flush`
returned early, cutting off the requests.
I fixed this by making the `flush` wait for the previous sends until
they are drained. Which also fixes the issue for every possible usage of
`@sentry/cloudflare` that isn't wrapped by `withSentry`.
```ts
// _registerWithInvocationWaitUntil
const pending = Promise.resolve(promise).then(() => undefined, () => undefined);
this._pendingEagerDrains.add(pending);
void pending.then(() => this._pendingEagerDrains.delete(pending));
// flush(), after super.flush(timeout)
await Promise.all(this._pendingEagerDrains);
```
There is no risk of hanging here because each send is already capped by
2 seconds.
---
### The Workers wrapper can shadow the `sentry.server.config` client
Because of the first fix, we now have an order problem. A `withSentry`
wrapper can override the client that was loaded from
`sentry.server.config` which would break all events, since there is no
DSN. The override happens because the wrapper runs first. It's not
really an override, more of a "shadowing".
This didn't happen before because the first client loaded from the
browser bundle and so they never conflicted.
The fix is to ensure the order loads the "correct" init first, which can
be arbitrary. I did the following to de-risk the idea:
- If no `sentry.server.config` file exists, then it is never added at
the top of the import order. So the wrapper client is the only source.
- If both `sentry.server.config` file exists along with a wrapper
client, prefer the server file client.
- The Astro worker `init` reads the bindings from `cloudflare:workers`
and fills unset options the same way the wrap does, so an init without a
`dsn` still picks up `SENTRY_DSN`. This only lives in the `workerd`
entry since `cloudflare:workers` doesn't resolve elsewhere.
I did think about applying (3) to the cloudflare SDK in general but that
may break apps that run it under Node, so need to figure it out later.
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