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extern crate reqwest;
extern crate serde;
extern crate serde_json;
extern crate regex;
use std::io::Read;
use irc::client::prelude::*;
use irc::error::Error as IrcError;
use self::regex::Regex;
use plugin::Plugin;
use self::reqwest::Client;
use self::reqwest::header::Connection;
use self::serde_json::Value;
register_plugin!(Currency);
lazy_static! {
static ref RE: Regex = Regex::new(r"([0-9]+) ([A-Za-z]+) (?i)(to) ([A-Za-z]+)").unwrap();
}
struct ConvertionRequest<'a> {
value: f64,
source: &'a str,
target: &'a str,
}
macro_rules! try_option {
($e:expr) => {
match $e {
Some(v) => v,
None => { return None; }
}
}
}
impl<'a> ConvertionRequest<'a> {
fn send(&self) -> Option<f64> {
let response = Client::new()
.get("https://api.fixer.io/latest")
.form(&[("base", self.source)])
.header(Connection::close())
.send();
match response {
Ok(mut response) => {
let mut body = String::new();
try_option!(response.read_to_string(&mut body).ok());
let convertion_rates: Result<Value, _> = serde_json::from_str(&body);
match convertion_rates {
Ok(convertion_rates) => {
let rates: &Value = try_option!(convertion_rates.get("rates"));
let target_rate: &Value =
try_option!(rates.get(self.target.to_uppercase()));
Some(self.value * try_option!(target_rate.as_f64()))
}
Err(_) => None,
}
}
Err(_) => None,
}
}
}
impl Currency {
fn grep_request<'a>(&self, msg: &'a str) -> Option<ConvertionRequest<'a>> {
match RE.captures(msg) {
Some(captures) => {
Some(ConvertionRequest {
value: {
let capture = try_option!(captures.get(1)).as_str();
try_option!(capture.parse().ok())
},
source: try_option!(captures.get(2)).as_str(),
target: try_option!(captures.get(4)).as_str(), // 3 is to/TO
})
}
None => None,
}
}
fn convert(&self,
server: &IrcServer,
_: &Message,
target: &str,
msg: &str)
-> Result<(), IrcError> {
let request = match self.grep_request(msg) {
Some(request) => request,
None => {
return Ok(());
}
};
match request.send() {
Some(response) => {
server.send_privmsg(target,
&*format!("{} {} => {:.4} {}",
request.value,
request.source,
response / 1.00000000,
request.target))
}
None => server.send_privmsg(target, "Error while converting given currency"),
}
}
}
impl Plugin for Currency {
fn is_allowed(&self, _: &IrcServer, message: &Message) -> bool {
match message.command {
Command::PRIVMSG(_, ref msg) => RE.is_match(msg),
_ => false,
}
}
fn execute(&mut self, server: &IrcServer, message: &Message) -> Result<(), IrcError> {
match message.command {
Command::PRIVMSG(ref target, ref msg) => self.convert(server, message, target, msg),
_ => Ok(()),
}
}
}
#[cfg(test)]
mod tests {
//use tests::{make_server, get_server_value};
//use irc::client::prelude::*;
//use plugin::Plugin;
//use regex::Regex;
//use super::Currency;
//#[test]
//fn test_big_jpy_to_eur() {
// let server = make_server("PRIVMSG test :5000000 JPY to EUR\r\n");
// let mut plugin = Currency::new();
// for message in server.iter() {
// let message = message.unwrap();
// assert!(plugin.is_allowed(&server, &message));
// assert!(plugin.execute(&server, &message).is_ok());
// }
// let regex = Regex::new(r"=> ([0-9]{2})").unwrap();
// let msg = get_server_value(&server);
// let captures = regex.captures(&*msg).unwrap();
// assert!(captures.at(0).is_some());
// let result = captures
// .at(0)
// .unwrap()
// .split_whitespace()
// .last()
// .unwrap()
// .parse::<i32>();
// assert!(result.is_ok());
// let value = result.unwrap();
// assert!(value > 10 && value < 100);
//}
}
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