shiplift 0.3.1

A Rust interface for maneuvering Docker containers
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//! Transports for communicating with the docker daemon

extern crate hyper;

use hyper::Client;
use hyper::client::Body;
use hyper::header;
use hyper::mime;
use self::super::{Error, Result};
use self::hyper::buffer::BufReader;
use self::hyper::header::ContentType;
use self::hyper::status::StatusCode;
use hyper::method::Method;
use std::fmt;
use std::io::{Read, Write};
use hyperlocal::DomainUrl;

pub fn tar() -> ContentType {
    ContentType(mime::Mime(mime::TopLevel::Application,
                           mime::SubLevel::Ext(String::from("tar")),
                           vec![]))
}

/// Transports are types which define the means of communication
/// with the docker daemon
pub enum Transport {
    /// A network tcp interface
    Tcp {
        client: Client,
        host: String,
    },
    /// A Unix domain socket
    Unix {
        client: Client,
        path: String,
    },
}

impl fmt::Debug for Transport {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match *self {
            Transport::Tcp { ref host, .. } => write!(f, "Tcp({})", host),
            Transport::Unix { ref path, .. } => write!(f, "Unix({})", path),
        }
    }
}

impl Transport {
    pub fn request<'a, B>(&'a self,
                          method: Method,
                          endpoint: &str,
                          body: Option<(B, ContentType)>)
                          -> Result<String>
        where B: Into<Body<'a>>
    {
        let mut res = try!(self.stream(method, endpoint, body));
        let mut body = String::new();
        try!(res.read_to_string(&mut body));
        debug!("{} raw response: {}", endpoint, body);
        Ok(body)
    }

    pub fn stream<'c, B>(&'c self,
                         method: Method,
                         endpoint: &str,
                         body: Option<(B, ContentType)>)
                         -> Result<Box<Read>>
        where B: Into<Body<'c>>
    {
        let headers = {
            let mut headers = header::Headers::new();
            headers.set(header::Host{ hostname: "".to_owned(), port: None });
            headers
        };
        let req = match *self {
            Transport::Tcp { ref client, ref host } => {
                client.request(method, &format!("{}{}", host, endpoint)[..])
            }
            Transport::Unix {  ref client, ref path } => {
                client.request(method, DomainUrl::new(&path, endpoint))
            }
        }.headers(headers);

        let embodied = match body {
            Some((b, c)) => req.header(c).body(b),
            _ => req,
        };
        let res = try!(embodied.send());
        match res.status {
            StatusCode::Ok | StatusCode::Created | StatusCode::SwitchingProtocols => {
                Ok(Box::new(res))
            }
            StatusCode::NoContent => Ok(Box::new(BufReader::new("".as_bytes()))),
            // todo: constantize these
            StatusCode::BadRequest => {
                Err(Error::Fault {
                    code: res.status,
                    message: "bad parameter".to_owned(),
                })
            }
            StatusCode::NotFound => {
                Err(Error::Fault {
                    code: res.status,
                    message: "not found".to_owned(),
                })
            }
            StatusCode::NotAcceptable => {
                Err(Error::Fault {
                    code: res.status,
                    message: "not acceptable".to_owned(),
                })
            }
            StatusCode::Conflict => {
                Err(Error::Fault {
                    code: res.status,
                    message: "conflict found".to_owned(),
                })
            }
            StatusCode::InternalServerError => {
                Err(Error::Fault {
                    code: res.status,
                    message: "internal server error".to_owned(),
                })
            }
            _ => unreachable!(),
        }
    }
}