redis 0.9.0

Redis driver for Rust.
Documentation 
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#![allow(dead_code)]

extern crate net2;
extern crate rand;

use redis::{self, RedisFuture};

use std::env;
use std::fs;
use std::process;
use std::thread::sleep;
use std::time::Duration;

use std::path::PathBuf;

#[derive(PartialEq)]
enum ServerType {
    Tcp,
    Unix,
}

pub struct RedisServer {
    pub process: process::Child,
    addr: redis::ConnectionAddr,
}

impl ServerType {
    fn get_intended() -> ServerType {
        match env::var("REDISRS_SERVER_TYPE")
            .ok()
            .as_ref()
            .map(|x| &x[..])
        {
            Some("tcp") => ServerType::Tcp,
            Some("unix") => ServerType::Unix,
            val => {
                panic!("Unknown server type {:?}", val);
            }
        }
    }
}

impl RedisServer {
    pub fn new() -> RedisServer {
        let server_type = ServerType::get_intended();
        let mut cmd = process::Command::new("redis-server");
        cmd.stdout(process::Stdio::null())
            .stderr(process::Stdio::null());

        let addr = match server_type {
            ServerType::Tcp => {
                // this is technically a race but we can't do better with
                // the tools that redis gives us :(
                let listener = net2::TcpBuilder::new_v4()
                    .unwrap()
                    .reuse_address(true)
                    .unwrap()
                    .bind("127.0.0.1:0")
                    .unwrap()
                    .listen(1)
                    .unwrap();
                let server_port = listener.local_addr().unwrap().port();
                cmd.arg("--port")
                    .arg(server_port.to_string())
                    .arg("--bind")
                    .arg("127.0.0.1");
                redis::ConnectionAddr::Tcp("127.0.0.1".to_string(), server_port)
            }
            ServerType::Unix => {
                let (a, b) = rand::random::<(u64, u64)>();
                let path = format!("/tmp/redis-rs-test-{}-{}.sock", a, b);
                cmd.arg("--port").arg("0").arg("--unixsocket").arg(&path);
                redis::ConnectionAddr::Unix(PathBuf::from(&path))
            }
        };

        let process = cmd.spawn().unwrap();
        RedisServer {
            process: process,
            addr: addr,
        }
    }

    pub fn wait(&mut self) {
        self.process.wait().unwrap();
    }

    pub fn get_client_addr(&self) -> &redis::ConnectionAddr {
        &self.addr
    }

    pub fn stop(&mut self) {
        let _ = self.process.kill();
        let _ = self.process.wait();
        match *self.get_client_addr() {
            redis::ConnectionAddr::Unix(ref path) => {
                fs::remove_file(&path).ok();
            }
            _ => {}
        }
    }
}

impl Drop for RedisServer {
    fn drop(&mut self) {
        self.stop()
    }
}

pub struct TestContext {
    pub server: RedisServer,
    pub client: redis::Client,
}

impl TestContext {
    pub fn new() -> TestContext {
        let server = RedisServer::new();

        let client = redis::Client::open(redis::ConnectionInfo {
            addr: Box::new(server.get_client_addr().clone()),
            db: 0,
            passwd: None,
        }).unwrap();
        let con;

        let millisecond = Duration::from_millis(1);
        loop {
            match client.get_connection() {
                Err(err) => if err.is_connection_refusal() {
                    sleep(millisecond);
                } else {
                    panic!("Could not connect: {}", err);
                },
                Ok(x) => {
                    con = x;
                    break;
                }
            }
        }
        redis::cmd("FLUSHDB").execute(&con);

        TestContext {
            server: server,
            client: client,
        }
    }

    pub fn connection(&self) -> redis::Connection {
        self.client.get_connection().unwrap()
    }

    pub fn async_connection(&self) -> RedisFuture<redis::async::Connection> {
        self.client.get_async_connection()
    }

    pub fn stop_server(&mut self) {
        self.server.stop();
    }

    pub fn shared_async_connection(&self) -> RedisFuture<redis::async::SharedConnection> {
        self.client.get_shared_async_connection()
    }
}