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docs(server): Add a forms server example
Add an example program illustrating parsing a request body through generating a response body.
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#![deny(warnings)] | ||
extern crate futures; | ||
extern crate hyper; | ||
extern crate pretty_env_logger; | ||
extern crate url; | ||
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use futures::{Future, Stream}; | ||
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use hyper::{Get, Post, StatusCode}; | ||
use hyper::header::ContentLength; | ||
use hyper::server::{Http, Service, Request, Response}; | ||
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use std::collections::HashMap; | ||
use url::form_urlencoded; | ||
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static INDEX: &[u8] = b"<html><body><form action=\"post\" method=\"post\">Name: <input type=\"text\" name=\"name\"><br>Number: <input type=\"text\" name=\"number\"><br><input type=\"submit\"></body></html>"; | ||
static MISSING: &[u8] = b"Missing field"; | ||
static NOTNUMERIC: &[u8] = b"Number field is not numeric"; | ||
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struct ParamExample; | ||
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impl Service for ParamExample { | ||
type Request = Request; | ||
type Response = Response; | ||
type Error = hyper::Error; | ||
type Future = Box<Future<Item = Self::Response, Error = Self::Error>>; | ||
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fn call(&self, req: Request) -> Self::Future { | ||
match (req.method(), req.path()) { | ||
(&Get, "/") | (&Get, "/post") => { | ||
Box::new(futures::future::ok(Response::new() | ||
.with_header(ContentLength(INDEX.len() as u64)) | ||
.with_body(INDEX))) | ||
}, | ||
(&Post, "/post") => { | ||
Box::new(req.body().concat2().map(|b| { | ||
// Parse the request body. form_urlencoded::parse | ||
// always succeeds, but in general parsing may | ||
// fail (for example, an invalid post of json), so | ||
// returning early with BadRequest may be | ||
// necessary. | ||
// | ||
// Warning: this is a simplified use case. In | ||
// principle names can appear multiple times in a | ||
// form, and the values should be rolled up into a | ||
// HashMap<String, Vec<String>>. However in this | ||
// example the simpler approach is sufficient. | ||
let params = form_urlencoded::parse(b.as_ref()).into_owned().collect::<HashMap<String, String>>(); | ||
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// Validate the request parameters, returning | ||
// early if an invalid input is detected. | ||
let name = if let Some(n) = params.get("name") { | ||
n | ||
} else { | ||
return Response::new() | ||
.with_status(StatusCode::UnprocessableEntity) | ||
.with_header(ContentLength(MISSING.len() as u64)) | ||
.with_body(MISSING); | ||
}; | ||
let number = if let Some(n) = params.get("number") { | ||
if let Ok(v) = n.parse::<f64>() { | ||
v | ||
} else { | ||
return Response::new() | ||
.with_status(StatusCode::UnprocessableEntity) | ||
.with_header(ContentLength(NOTNUMERIC.len() as u64)) | ||
.with_body(NOTNUMERIC); | ||
} | ||
} else { | ||
return Response::new() | ||
.with_status(StatusCode::UnprocessableEntity) | ||
.with_header(ContentLength(MISSING.len() as u64)) | ||
.with_body(MISSING); | ||
}; | ||
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// Render the response. This will often involve | ||
// calls to a database or web service, which will | ||
// require creating a new stream for the response | ||
// body. Since those may fail, other error | ||
// responses such as InternalServiceError may be | ||
// needed here, too. | ||
let body = format!("Hello {}, your number is {}", name, number); | ||
Response::new() | ||
.with_header(ContentLength(body.len() as u64)) | ||
.with_body(body) | ||
})) | ||
}, | ||
_ => { | ||
Box::new(futures::future::ok(Response::new() | ||
.with_status(StatusCode::NotFound))) | ||
} | ||
} | ||
} | ||
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} | ||
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fn main() { | ||
pretty_env_logger::init().unwrap(); | ||
let addr = "127.0.0.1:1337".parse().unwrap(); | ||
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let mut server = Http::new().bind(&addr, || Ok(ParamExample)).unwrap(); | ||
server.no_proto(); | ||
println!("Listening on http://{} with 1 thread.", server.local_addr().unwrap()); | ||
server.run().unwrap(); | ||
} |