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update migration guide

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Rob Ede 2022-02-09 12:31:06 +00:00
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actix-web/MIGRATION-4.0.md
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@ -15,7 +15,20 @@ Headings marked with :warning: are **breaking behavioral changes** and will prob
- [`FromRequest` Trait](#fromrequest-trait)
- [Compression Feature Flags](#compression-feature-flags)
- [`web::Path`](#webpath)
- [Rustls](#rustls-crate-upgrade)
- [Rustls Crate Upgrade](#rustls-crate-upgrade)
- [Removed `awc` Client Re-export](#removed-awc-client-re-export)
- [Integration Testing Utils Moved To `actix-test`](#integration-testing-utils-moved-to-actix-test)
- [Header APIs](#header-apis)
- [Body Types / Removal of Body+ResponseBody types / Addition of EitherBody](#body-types--removal-of-bodyresponsebody-types--addition-of-eitherbody)
- [Middleware Trait APIs](#middleware-trait-apis)
- [`Responder` Trait](#responder-trait)
- [`App::data` Deprecation :warning:](#appdata-deprecation-warning)
- [Direct Dependency On `actix-rt` And `actix-service`](#direct-dependency-on-actix-rt-and-actix-service)
- [Server Must Be Polled :warning:](#server-must-be-polled-warning)
- [Guards API](#guards-api)
- [Returning `HttpResponse` synchronously](#returning-httpresponse-synchronously)
- [`#[actix_web::main]` and `#[tokio::main]`](#actixwebmain-and-tokiomain)
- [`web::block`](#webblock)
## MSRV
@ -126,6 +139,8 @@ In particular, folks seem to be struggling with the `ErrorHandlers` middleware b
## Middleware Trait APIs
> This section builds upon guidance from the [response body types](#body-types--removal-of-bodyresponsebody-types--addition-of-eitherbody) section.
TODO
TODO: Also write the Middleware author's guide.
@ -154,7 +169,7 @@ Now that more emphasis is placed on expressive body types, as explained in the [
}
```
## `App::data` deprecation :warning:
## `App::data` Deprecation :warning:
The `App::data` method is deprecated. Replace instances of this with `App::app_data`. Exposing both methods was a footgun and lead to lots of confusion when trying to extract the data in handlers. Now, when using the `Data` wrapper, the type you put in to `app_data` is the same type you extract in handler arguments.
@ -256,3 +271,15 @@ Or, for these extremely simple cases, utilise an `HttpResponseBuilder`:
Actix Web now works seamlessly with the primary way of starting a multi-threaded Tokio runtime, `#[tokio::main]`. Therefore, it is no longer necessary to spawn a thread when you need to run something alongside Actix Web that uses of Tokio's multi-threaded mode; you can simply await the server within this context or, if preferred, use `tokio::spawn` just like any other async task.
For now, `actix` actor support (and therefore WebSocket support via `actix-web-actors`) still requires `#[actix_web::main]` so that a `System` context is created. Designs are being created for an alternative WebSocket interface that does not require actors that should land sometime in the v4.x cycle.
## `web::block`
The `web::block` helper has changed return type from roughly `async fn(fn() -> Result<T, E>) Result<T, BlockingError<E>>` to `async fn(fn() -> T) Result<T, BlockingError>`. That's to say that the blocking function can now return things that are not `Result`s and it does not wrap error types anymore. If you still need to return `Result`s then you'll likely want to use double `?` after the `.await`.
```diff
- let n: u32 = web::block(|| Ok(123)).await?;
+ let n: u32 = web::block(|| 123).await?;
- let n: u32 = web::block(|| Ok(123)).await?;
+ let n: u32 = web::block(|| Ok(123)).await??;
```