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use chan;
use chan::{Sender, Receiver};
use hyper::status::StatusCode;
use std::fmt::{Display, Formatter, Result as FmtResult};
use std::str;
use datatype::{Error, Method, Url};
/// Abstracts a particular HTTP Client implementation with the basic methods
/// for sending `Request`s and receiving asynchronous `Response`s via a channel.
pub trait Client {
fn chan_request(&self, req: Request, resp_tx: Sender<Response>);
fn send_request(&self, req: Request) -> Receiver<Response> {
let (resp_tx, resp_rx) = chan::async::<Response>();
self.chan_request(req, resp_tx);
resp_rx
}
fn get(&self, url: Url, body: Option<Vec<u8>>) -> Receiver<Response> {
self.send_request(Request { method: Method::Get, url: url, body: body })
}
fn post(&self, url: Url, body: Option<Vec<u8>>) -> Receiver<Response> {
self.send_request(Request { method: Method::Post, url: url, body: body })
}
fn put(&self, url: Url, body: Option<Vec<u8>>) -> Receiver<Response> {
self.send_request(Request { method: Method::Put, url: url, body: body })
}
fn is_testing(&self) -> bool { false }
}
/// A simplified representation of an HTTP request for use in the client.
#[derive(Debug)]
pub struct Request {
pub method: Method,
pub url: Url,
pub body: Option<Vec<u8>>
}
/// A Response enumerates between a successful (e.g. 2xx) HTTP response, a failed
/// (e.g. 4xx/5xx) response, or an Error before receiving any response.
#[derive(Debug)]
pub enum Response {
Success(ResponseData),
Failed(ResponseData),
Error(Error)
}
impl Display for Response {
fn fmt(&self, f: &mut Formatter) -> FmtResult {
match *self {
Response::Success(ref data) => write!(f, "{}", data),
Response::Failed(ref data) => write!(f, "{}", data),
Response::Error(ref err) => write!(f, "{}", err),
}
}
}
/// Wraps the HTTP Status Code as well as any returned body.
#[derive(Debug)]
pub struct ResponseData {
pub code: StatusCode,
pub body: Vec<u8>
}
impl Display for ResponseData {
fn fmt(&self, f: &mut Formatter) -> FmtResult {
match self.body.len() {
0 => write!(f, "Response Code: {}", self.code),
n => match str::from_utf8(&self.body) {
Ok(text) => write!(f, "Response Code: {}, Body:\n{}", self.code, text),
Err(_) => write!(f, "Response Code: {}, Body: {} bytes", self.code, n),
}
}
}
}
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