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#![deny(warnings)]
use warp::Filter;
#[tokio::main]
async fn main() {
pretty_env_logger::init();
// We'll start simple, and gradually show how you combine these powers
// into super powers!
// GET /
let hello_world = warp::path::end().map(|| "Hello, World at root!");
// GET /hi
let hi = warp::path("hi").map(|| "Hello, World!");
// How about multiple segments? First, we could use the `path!` macro:
//
// GET /hello/from/warp
let hello_from_warp = warp::path!("hello" / "from" / "warp").map(|| "Hello from warp!");
// Fine, but how do I handle parameters in paths?
//
// GET /sum/:u32/:u32
let sum = warp::path!("sum" / u32 / u32).map(|a, b| format!("{} + {} = {}", a, b, a + b));
// Any type that implements FromStr can be used, and in any order:
//
// GET /:u16/times/:u16
let times =
warp::path!(u16 / "times" / u16).map(|a, b| format!("{} times {} = {}", a, b, a * b));
// Oh shoot, those math routes should be mounted at a different path,
// is that possible? Yep.
//
// GET /math/sum/:u32/:u32
// GET /math/:u16/times/:u16
let math = warp::path("math");
let _sum = math.and(sum);
let _times = math.and(times);
// What! And? What's that do?
//
// It combines the filters in a sort of "this and then that" order. In
// fact, it's exactly what the `path!` macro has been doing internally.
//
// GET /bye/:string
let bye = warp::path("bye")
.and(warp::path::param())
.map(|name: String| format!("Good bye, {}!", name));
// Ah, can filters do things besides `and`?
//
// Why, yes they can! They can also `or`! As you might expect, `or` creates
// a "this or else that" chain of filters. If the first doesn't succeed,
// then it tries the other.
//
// So, those `math` routes could have been mounted all as one, with `or`.
//
// GET /math/sum/:u32/:u32
// GET /math/:u16/times/:u16
let math = warp::path("math").and(sum.or(times));
// We can use the end() filter to match a shorter path
let help = warp::path("math")
// Careful! Omitting the following line would make this filter match
// requests to /math/sum/:u32/:u32 and /math/:u16/times/:u16
.and(warp::path::end())
.map(|| "This is the Math API. Try calling /math/sum/:u32/:u32 or /math/:u16/times/:u16");
let math = help.or(math);
// Let's let people know that the `sum` and `times` routes are under `math`.
let sum = sum.map(|output| format!("(This route has moved to /math/sum/:u16/:u16) {}", output));
let times =
times.map(|output| format!("(This route has moved to /math/:u16/times/:u16) {}", output));
// It turns out, using `or` is how you combine everything together into
// a single API. (We also actually haven't been enforcing that the
// method is GET, so we'll do that too!)
//
// GET /
// GET /hi
// GET /hello/from/warp
// GET /bye/:string
// GET /math/sum/:u32/:u32
// GET /math/:u16/times/:u16
let routes = warp::get().and(
hello_world
.or(hi)
.or(hello_from_warp)
.or(bye)
.or(math)
.or(sum)
.or(times),
);
// Note that composing filters for many routes may increase compile times (because it uses a lot of generics).
// If you wish to use dynamic dispatch instead and speed up compile times while
// making it slightly slower at runtime, you can use Filter::boxed().
warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
}
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