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extern crate reqwest;
extern crate serde;
extern crate serde_json;
extern crate regex;
use std::io::Read;
use std::num::ParseFloatError;
use irc::client::prelude::*;
use irc::error::Error as IrcError;
use self::reqwest::Client;
use self::reqwest::header::Connection;
use self::serde_json::Value;
use plugin::*;
#[derive(PluginName, Debug)]
pub struct Currency;
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 {
pub fn new() -> Currency {
Currency {}
}
fn eval_command<'a>(&self, tokens: &'a [String]) -> Result<ConvertionRequest<'a>, ParseFloatError> {
Ok(ConvertionRequest {
value: tokens[0].parse()?,
source: &tokens[1],
target: &tokens[2],
})
}
fn convert(&self, server: &IrcServer, command: PluginCommand) -> Result<(), IrcError> {
if command.tokens.len() < 3 {
return self.invalid_command(server, &command);
}
let request = match self.eval_command(&command.tokens) {
Ok(request) => request,
Err(_) => {
return self.invalid_command(server, &command);
}
};
match request.send() {
Some(response) => {
let response = format!("{} {} => {:.4} {}",
request.value,
request.source.to_lowercase(),
response / 1.00000000,
request.target.to_lowercase());
server.send_privmsg(&command.target, &response)
}
None => server.send_notice(&command.source, "Error while converting given currency"),
}
}
fn help(&self, server: &IrcServer, command: &mut PluginCommand) -> Result<(), IrcError> {
let help = format!("usage: {} currency value from_currency to_currency\r\n\
example: 1.5 eur usd\r\n\
available currencies: AUD, BGN, BRL, CAD, \
CHF, CNY, CZK, DKK, GBP, HKD, HRK, HUF, \
IDR, ILS, INR, JPY, KRW, MXN, MYR, NOK, \
NZD, PHP, PLN, RON, RUB, SEK, SGD, THB, \
TRY, USD, ZAR",
server.current_nickname());
server.send_notice(&command.source, &help)
}
fn invalid_command(&self, server: &IrcServer, command: &PluginCommand) -> Result<(), IrcError> {
let help = format!("Incorrect Command. \
Send \"{} currency help\" for help.",
server.current_nickname());
server.send_notice(&command.source, &help)
}
}
impl Plugin for Currency {
fn is_allowed(&self, _: &IrcServer, _: &Message) -> bool {
false
}
fn execute(&mut self, _: &IrcServer, _: &Message) -> Result<(), IrcError> {
panic!("Currency does not implement the execute function!")
}
fn command(&mut self, server: &IrcServer, mut command: PluginCommand) -> Result<(), IrcError> {
if command.tokens.is_empty() {
return self.invalid_command(server, &command);
}
match command.tokens[0].as_ref() {
"help" => self.help(server, &mut command),
_ => self.convert(server, command),
}
}
}
#[cfg(test)]
mod tests {}
|
