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Merge pull request #1400 from jolhoeft/params_example

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docs(server): Add a forms server example
This commit is contained in:
Sean McArthur
2017-12-13 17:40:10 -08:00
committed by GitHub
parent be7ca0415d 61877f6f6e
commit 8f6931b349
2 changed files with 107 additions and 0 deletions
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1
Cargo.toml
View File

@@ -41,6 +41,7 @@ unicase = "2.0"
num_cpus = "1.0" num_cpus = "1.0"
pretty_env_logger = "0.1" pretty_env_logger = "0.1"
spmc = "0.2" spmc = "0.2"
url = "1.0"
[features] [features]
default = ["server-proto"] default = ["server-proto"]

106
examples/params.rs Normal file
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@@ -0,0 +1,106 @@
#![deny(warnings)]
extern crate futures;
extern crate hyper;
extern crate pretty_env_logger;
extern crate url;
use futures::{Future, Stream};
use hyper::{Get, Post, StatusCode};
use hyper::header::ContentLength;
use hyper::server::{Http, Service, Request, Response};
use std::collections::HashMap;
use url::form_urlencoded;
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";
struct ParamExample;
impl Service for ParamExample {
type Request = Request;
type Response = Response;
type Error = hyper::Error;
type Future = Box<Future<Item = Self::Response, Error = Self::Error>>;
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>>();
// 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);
};
// 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)))
}
}
}
}
fn main() {
pretty_env_logger::init().unwrap();
let addr = "127.0.0.1:1337".parse().unwrap();
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();
}