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Daniil Gentili 2023-11-17 18:59:13 +01:00
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3
guide/src/SUMMARY.md
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@ -24,13 +24,14 @@
- [Class Object](./types/class_object.md)
- [Closure](./types/closure.md)
- [Functions & methods](./types/functions.md)
- [Async futures](./macros/impl.md#async)
- [Async futures](./macros/async_impl.md)
- [Macros](./macros/index.md)
- [Module](./macros/module.md)
- [Module Startup Function](./macros/module_startup.md)
- [Function](./macros/function.md)
- [Classes](./macros/classes.md)
- [`impl`s](./macros/impl.md)
- [async `impl`s](./macros/async_impl.md)
- [Constants](./macros/constant.md)
- [`ZvalConvert`](./macros/zval_convert.md)
- [Exceptions](./exceptions.md)

130
guide/src/macros/async_impl.md Normal file
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@ -0,0 +1,130 @@
# `#[php_async_impl]`
Using `#[php_async_impl]` instead of `#[php_impl]` allows us to expose any async Rust library to PHP, using [PHP fibers](https://www.php.net/manual/en/language.fibers.php), [php-tokio](https://github.com/danog/php-tokio) and the [PHP Revolt event loop](https://revolt.run) under the hood to handle async interoperability.
This allows full compatibility with [amphp](https://amphp.org), [PSL](https://github.com/azjezz/psl), [reactphp](https://reactphp.org) and any other async PHP library based on [Revolt](https://revolt.run).
Traits annotated with `#[php_impl]` can freely expose any async function, using `await` and any async Rust library.
Make sure to also expose the `php_tokio::EventLoop::init` and `php_tokio::EventLoop::wakeup` functions to PHP in order to initialize the event loop, as specified in the full example [here »](#async-example).
Also, make sure to invoke `EventLoop::shutdown` in the request shutdown handler to clean up the tokio event loop before finishing the request.
## Async example
In this example, we're exposing an async Rust HTTP client library called [reqwest](https://docs.rs/reqwest/latest/reqwest/) to PHP, using [PHP fibers](https://www.php.net/manual/en/language.fibers.php), [php-tokio](https://github.com/danog/php-tokio) and the [PHP Revolt event loop](https://revolt.run) under the hood to handle async interoperability.
This allows full compatibility with [amphp](https://amphp.org), [PSL](https://github.com/azjezz/psl), [reactphp](https://reactphp.org) and any other async PHP library based on [Revolt](https://revolt.run).
Make sure to require [php-tokio](https://github.com/danog/php-tokio) as a dependency before proceeding.
```rust,ignore
use ext_php_rs::prelude::*;
use php_tokio::{php_async_impl, EventLoop};
#[php_class]
struct Client {}
#[php_async_impl]
impl Client {
pub fn init() -> PhpResult<u64> {
EventLoop::init()
}
pub fn wakeup() -> PhpResult<()> {
EventLoop::wakeup()
}
pub async fn get(url: &str) -> anyhow::Result<String> {
Ok(reqwest::get(url).await?.text().await?)
}
}
pub extern "C" fn request_shutdown(_type: i32, _module_number: i32) -> i32 {
EventLoop::shutdown();
0
}
#[php_module]
pub fn get_module(module: ModuleBuilder) -> ModuleBuilder {
module.request_shutdown_function(request_shutdown)
}
```
Here's the async PHP code we use to interact with the Rust class we just exposed.
The `Client::init` method needs to be called only once in order to initialize the Revolt event loop and link it to the Tokio event loop, as shown by the following code.
See [here &raquo;](https://amphp.org) for more info on async PHP using [amphp](https://amphp.org) + [revolt](https://revolt.run).
```php
<?php declare(strict_types=1);
namespace Reqwest;
use Revolt\EventLoop;
use function Amp\async;
use function Amp\Future\await;
final class Client
{
private static ?string $id = null;
public static function init(): void
{
if (self::$id !== null) {
return;
}
$f = \fopen("php://fd/".\Client::init(), 'r+');
\stream_set_blocking($f, false);
self::$id = EventLoop::onReadable($f, fn () => \Client::wakeup());
}
public static function reference(): void
{
EventLoop::reference(self::$id);
}
public static function unreference(): void
{
EventLoop::unreference(self::$id);
}
public static function __callStatic(string $name, array $args): mixed
{
return \Client::$name(...$args);
}
}
Client::init();
function test(int $delay): void
{
$url = "https://httpbin.org/delay/$delay";
$t = time();
echo "Making async reqwest to $url that will return after $delay seconds...".PHP_EOL;
Client::get($url);
$t = time() - $t;
echo "Got response from $url after ~".$t." seconds!".PHP_EOL;
};
$futures = [];
$futures []= async(test(...), 5);
$futures []= async(test(...), 5);
$futures []= async(test(...), 5);
await($futures);
```
Result:
```
Making async reqwest to https://httpbin.org/delay/5 that will return after 5 seconds...
Making async reqwest to https://httpbin.org/delay/5 that will return after 5 seconds...
Making async reqwest to https://httpbin.org/delay/5 that will return after 5 seconds...
Got response from https://httpbin.org/delay/5 after ~5 seconds!
Got response from https://httpbin.org/delay/5 after ~5 seconds!
Got response from https://httpbin.org/delay/5 after ~5 seconds!
```
[`php_function`]: ./function.md

135
guide/src/macros/impl.md
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@ -8,7 +8,7 @@ implementations cannot be exported to PHP.
If you do not want a function exported to PHP, you should place it in a separate
`impl` block.
If you want to use async Rust, use `#[php_async_impl]`, instead: see [here &raquo;](#async) for more info.
If you want to use async Rust, use `#[php_async_impl]`, instead: see [here &raquo;](./async_impl.md) for more info.
## Methods
@ -65,20 +65,6 @@ the attribute, the function is not exported to PHP like a regular method.
Constructors cannot use the visibility or rename attributes listed above.
### Async
Using `#[php_async_impl]` instead of `#[php_impl]` allows us to expose any async Rust library to PHP, using [PHP fibers](https://www.php.net/manual/en/language.fibers.php), [php-tokio](https://github.com/danog/php-tokio) and the [PHP Revolt event loop](https://revolt.run) under the hood to handle async interoperability.
This allows full compatibility with [amphp](https://amphp.org), [PSL](https://github.com/azjezz/psl), [reactphp](https://reactphp.org) and any other async PHP library based on [Revolt](https://revolt.run).
Traits annotated with `#[php_impl]` can freely expose any async function, using `await` and any async Rust library.
Make sure to also expose the `php_tokio::EventLoop::init` and `php_tokio::EventLoop::wakeup` functions to PHP in order to initialize the event loop, as specified in the full example [here &raquo;](#async-example).
Also, make sure to invoke `EventLoop::shutdown` in the request shutdown handler to clean up the tokio event loop before finishing the request.
See [here &raquo;](#async-example) for the full example.
## Constants
Constants are defined as regular Rust `impl` constants. Any type that implements
@ -178,121 +164,4 @@ var_dump(Human::get_max_age()); // int(100)
var_dump(Human::MAX_AGE); // int(100)
```
### Async example
In this example, we're exposing an async Rust HTTP client library called [reqwest](https://docs.rs/reqwest/latest/reqwest/) to PHP, using [PHP fibers](https://www.php.net/manual/en/language.fibers.php), [php-tokio](https://github.com/danog/php-tokio) and the [PHP Revolt event loop](https://revolt.run) under the hood to handle async interoperability.
This allows full compatibility with [amphp](https://amphp.org), [PSL](https://github.com/azjezz/psl), [reactphp](https://reactphp.org) and any other async PHP library based on [Revolt](https://revolt.run).
Make sure to require [php-tokio](https://github.com/danog/php-tokio) as a dependency before proceeding.
```rust,ignore
use ext_php_rs::prelude::*;
use php_tokio::{php_async_impl, EventLoop};
#[php_class]
struct Client {}
#[php_async_impl]
impl Client {
pub fn init() -> PhpResult<u64> {
EventLoop::init()
}
pub fn wakeup() -> PhpResult<()> {
EventLoop::wakeup()
}
pub async fn get(url: &str) -> anyhow::Result<String> {
Ok(reqwest::get(url).await?.text().await?)
}
}
pub extern "C" fn request_shutdown(_type: i32, _module_number: i32) -> i32 {
EventLoop::shutdown();
0
}
#[php_module]
pub fn get_module(module: ModuleBuilder) -> ModuleBuilder {
module.request_shutdown_function(request_shutdown)
}
```
Here's the async PHP code we use to interact with the Rust class we just exposed.
The `Client::init` method needs to be called only once in order to initialize the Revolt event loop and link it to the Tokio event loop, as shown by the following code.
See [here &raquo;](https://amphp.org) for more info on async PHP using [amphp](https://amphp.org) + [revolt](https://revolt.run).
```php
<?php declare(strict_types=1);
namespace Reqwest;
use Revolt\EventLoop;
use function Amp\async;
use function Amp\Future\await;
final class Client
{
private static ?string $id = null;
public static function init(): void
{
if (self::$id !== null) {
return;
}
$f = \fopen("php://fd/".\Client::init(), 'r+');
\stream_set_blocking($f, false);
self::$id = EventLoop::onReadable($f, fn () => \Client::wakeup());
}
public static function reference(): void
{
EventLoop::reference(self::$id);
}
public static function unreference(): void
{
EventLoop::unreference(self::$id);
}
public static function __callStatic(string $name, array $args): mixed
{
return \Client::$name(...$args);
}
}
Client::init();
function test(int $delay): void
{
$url = "https://httpbin.org/delay/$delay";
$t = time();
echo "Making async reqwest to $url that will return after $delay seconds...".PHP_EOL;
Client::get($url);
$t = time() - $t;
echo "Got response from $url after ~".$t." seconds!".PHP_EOL;
};
$futures = [];
$futures []= async(test(...), 5);
$futures []= async(test(...), 5);
$futures []= async(test(...), 5);
await($futures);
```
Result:
```
Making async reqwest to https://httpbin.org/delay/5 that will return after 5 seconds...
Making async reqwest to https://httpbin.org/delay/5 that will return after 5 seconds...
Making async reqwest to https://httpbin.org/delay/5 that will return after 5 seconds...
Got response from https://httpbin.org/delay/5 after ~5 seconds!
Got response from https://httpbin.org/delay/5 after ~5 seconds!
Got response from https://httpbin.org/delay/5 after ~5 seconds!
```
[`php_function`]: ./function.md
[`php_async_impl`]: ./async_impl.md