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docs(server): clean the web_api example up

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add comments and a json example

closes #1595
This commit is contained in:
Özgür Akkurt
2018-07-06 20:15:07 +03:00
committed by Sean McArthur
parent 9cd971d8f3
commit bff37244d8
1 changed files with 37 additions and 3 deletions
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40
examples/web_api.rs
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@@ -2,10 +2,11 @@
extern crate futures;
extern crate hyper;
extern crate pretty_env_logger;
extern crate serde_json;
use futures::{future, Future, Stream};
use hyper::{Body, Chunk, Client, Method, Request, Response, Server, StatusCode};
use hyper::{Body, Chunk, Client, Method, Request, Response, Server, StatusCode, header};
use hyper::client::HttpConnector;
use hyper::service::service_fn;
@@ -27,32 +28,65 @@ fn response_examples(req: Request<Body>, client: &Client<HttpConnector>)
},
(&Method::GET, "/test.html") => {
// Run a web query against the web api below
// build the request
let req = Request::builder()
.method(Method::POST)
.uri(URL)
.body(LOWERCASE.into())
.unwrap();
// use the request with client
let web_res_future = client.request(req);
Box::new(web_res_future.map(|web_res| {
// return the response that came from the web api and the original text together
// to show the difference
let body = Body::wrap_stream(web_res.into_body().map(|b| {
Chunk::from(format!("before: '{:?}'<br>after: '{:?}'",
Chunk::from(format!("<b>before</b>: {}<br><b>after</b>: {}",
std::str::from_utf8(LOWERCASE).unwrap(),
std::str::from_utf8(&b).unwrap()))
}));
Response::new(body)
}))
},
(&Method::POST, "/web_api") => {
// A web api to run against. Simple upcasing of the body.
// A web api to run against. Uppercases the body and returns it back.
let body = Body::wrap_stream(req.into_body().map(|chunk| {
// uppercase the letters
let upper = chunk.iter().map(|byte| byte.to_ascii_uppercase())
.collect::<Vec<u8>>();
Chunk::from(upper)
}));
Box::new(future::ok(Response::new(body)))
},
(&Method::GET, "/json") => {
let data = vec!["foo", "bar"];
let res = match serde_json::to_string(&data) {
Ok(json) => {
// return a json response
Response::builder()
.header(header::CONTENT_TYPE, "application/json")
.body(Body::from(json))
.unwrap()
}
// This is unnecessary here because we know
// this can't fail. But if we were serializing json that came from another
// source we could handle an error like this.
Err(e) => {
eprintln!("serializing json: {}", e);
Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.body(Body::from("Internal Server Error"))
.unwrap()
}
};
Box::new(future::ok(res))
}
_ => {
// Return 404 not found response.
let body = Body::from(NOTFOUND);
Box::new(future::ok(Response::builder()
.status(StatusCode::NOT_FOUND)