use crate::rest::*;
use crate::router::ResponseFuture;
use bytes::Buf;
use futures::future::ok;
use hyper::body;
use hyper::{Body, Request, Response, StatusCode};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::fmt::Debug;
use url::form_urlencoded;
pub async fn parse_body<T>(req: Request<Body>) -> Result<T, Error>
where
for<'de> T: Deserialize<'de> + Send + 'static,
{
let raw = body::to_bytes(req.into_body())
.await
.map_err(|e| ErrorKind::RequestError(format!("Failed to read request: {}", e)))?;
serde_json::from_reader(raw.bytes())
.map_err(|e| ErrorKind::RequestError(format!("Invalid request body: {}", e)).into())
}
pub fn result_to_response<T>(res: Result<T, Error>) -> ResponseFuture
where
T: Serialize,
{
match res {
Ok(s) => json_response_pretty(&s),
Err(e) => match e.kind() {
ErrorKind::Argument(msg) => response(StatusCode::BAD_REQUEST, msg.clone()),
ErrorKind::RequestError(msg) => response(StatusCode::BAD_REQUEST, msg.clone()),
ErrorKind::NotFound => response(StatusCode::NOT_FOUND, ""),
ErrorKind::Internal(msg) => response(StatusCode::INTERNAL_SERVER_ERROR, msg.clone()),
ErrorKind::ResponseError(msg) => {
response(StatusCode::INTERNAL_SERVER_ERROR, msg.clone())
}
ErrorKind::Router(_) => response(StatusCode::INTERNAL_SERVER_ERROR, ""),
},
}
}
pub fn json_response<T>(s: &T) -> ResponseFuture
where
T: Serialize,
{
match serde_json::to_string(s) {
Ok(json) => response(StatusCode::OK, json),
Err(_) => response(StatusCode::INTERNAL_SERVER_ERROR, ""),
}
}
pub fn json_response_pretty<T>(s: &T) -> ResponseFuture
where
T: Serialize,
{
match serde_json::to_string_pretty(s) {
Ok(json) => response(StatusCode::OK, json),
Err(e) => response(
StatusCode::INTERNAL_SERVER_ERROR,
format!("can't create json response: {}", e),
),
}
}
pub fn just_response<T: Into<Body> + Debug>(status: StatusCode, text: T) -> Response<Body> {
let mut resp = Response::new(text.into());
*resp.status_mut() = status;
resp
}
pub fn response<T: Into<Body> + Debug>(status: StatusCode, text: T) -> ResponseFuture {
Box::pin(ok(just_response(status, text)))
}
pub struct QueryParams {
params: HashMap<String, Vec<String>>,
}
impl QueryParams {
pub fn process_multival_param<F>(&self, name: &str, mut f: F)
where
F: FnMut(&str),
{
if let Some(ids) = self.params.get(name) {
for id in ids {
for id in id.split(',') {
f(id);
}
}
}
}
pub fn get(&self, name: &str) -> Option<&String> {
self.params.get(name).and_then(|v| v.first())
}
}
impl From<&str> for QueryParams {
fn from(query_string: &str) -> Self {
let params = form_urlencoded::parse(query_string.as_bytes())
.into_owned()
.fold(HashMap::new(), |mut hm, (k, v)| {
hm.entry(k).or_insert_with(|| vec![]).push(v);
hm
});
QueryParams { params }
}
}
impl From<Option<&str>> for QueryParams {
fn from(query_string: Option<&str>) -> Self {
match query_string {
Some(query_string) => Self::from(query_string),
None => QueryParams {
params: HashMap::new(),
},
}
}
}
impl From<Request<Body>> for QueryParams {
fn from(req: Request<Body>) -> Self {
Self::from(req.uri().query())
}
}
#[macro_export]
macro_rules! right_path_element(
($req: expr) =>(
match $req.uri().path().trim_end_matches('/').rsplit('/').next() {
None => return response(StatusCode::BAD_REQUEST, "invalid url"),
Some(el) => el,
}
));
#[macro_export]
macro_rules! must_get_query(
($req: expr) =>(
match $req.uri().query() {
Some(q) => q,
None => return Err(ErrorKind::RequestError("no query string".to_owned()).into()),
}
));
#[macro_export]
macro_rules! parse_param(
($param: expr, $name: expr, $default: expr) =>(
match $param.get($name) {
None => $default,
Some(val) => match val.parse() {
Ok(val) => val,
Err(_) => return Err(ErrorKind::RequestError(format!("invalid value of parameter {}", $name)).into()),
}
}
));
#[macro_export]
macro_rules! parse_param_no_err(
($param: expr, $name: expr, $default: expr) =>(
match $param.get($name) {
None => $default,
Some(val) => match val.parse() {
Ok(val) => val,
Err(_) => $default,
}
}
));
#[macro_export]
macro_rules! w_fut(
($p: expr) =>(
match w($p) {
Ok(p) => p,
Err(_) => return response(StatusCode::INTERNAL_SERVER_ERROR, "weak reference upgrade failed" ),
}
));