http_server.rs
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	/* -------------------------------------------------------------
	Servers log microservice
	- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
	Project: Nasqueron
	Created: 2016-11-10
	License: BSD-2-Clause
	------------------------------------------------------------- */

	use iron::prelude::*;
	use router::Router;

	use std::env;

	/* -------------------------------------------------------------
	HTTP server

	Spawns a HTTP server listens to $BIND environment variable
	or by default to *:3000.

	The server is based on the Iron framework.

	Controller logic is defined in the web_handlers module.
	- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

	/// Prepares an Iron handler.
	fn initialize_handler() -> Router {
	router!(
	index: get "/" => ::web_handlers::get,
	status: get "/status" => ::web_handlers::alive
	)
	}

	/// Gets the address the HTTP server should bind to.
	fn get_bind_address() -> String {
	env::var("BIND").unwrap_or("0.0.0.0:3000".to_string())
	}

	/// Runs an HTTP server.
	pub fn run() {
	let listen = get_bind_address();

	info!("Starting HTTP server");
	info!("Listen to http://{}", listen);

	let _server = Iron::new(initialize_handler()).http(&*listen);
	if let Err(err) = _server {
	error!("{}", err)
	}
	}

	/* -------------------------------------------------------------
	Tests
	- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */

	#[cfg(test)]
	mod tests {
	extern crate iron_test;

	use super::get_bind_address;
	use super::initialize_handler;

	use iron::Headers;
	use iron::status;
	use self::iron_test::request;
	use self::iron_test::response::extract_body_to_bytes;

	#[test]
	fn get_bind_address_returns_expected_default_value() {
	assert_eq!("0.0.0.0:3000", get_bind_address());
	}

	#[test]
	fn status_returns_200_alive() {
	let response = request::get("http://localhost:3000/status",
	Headers::new(),
	&initialize_handler())
	.expect("Can't get a request.");

	assert_eq!(response.status, Some(status::Ok));
	assert_eq!(extract_body_to_bytes(response), b"ALIVE");
	}
	}

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