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extern crate reqwest;
extern crate serde;
extern crate serde_json;
use std::io::Read;
use std::num::ParseFloatError;
use irc::client::prelude::*;
use self::reqwest::Client;
use self::reqwest::header::Connection;
use self::serde_json::Value;
use plugin::*;
use error::ErrorKind as FrippyErrorKind;
use error::FrippyError;
use failure::ResultExt;
#[derive(PluginName, Default, Debug)]
pub struct Currency;
struct ConvertionRequest<'a> {
value: f64,
source: &'a str,
target: &'a str,
}
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();
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 = convertion_rates.get("rates")?;
let target_rate: &Value = rates.get(self.target.to_uppercase())?;
Some(self.value * 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, command: &mut PluginCommand) -> Result<String, &str> {
if command.tokens.len() < 3 {
return Err(self.invalid_command());
}
let request = match self.eval_command(&command.tokens) {
Ok(request) => request,
Err(_) => {
return Err(self.invalid_command());
}
};
match request.send() {
Some(response) => {
let response = format!(
"{} {} => {:.4} {}",
request.value,
request.source.to_lowercase(),
response / 1.00000000,
request.target.to_lowercase()
);
Ok(response)
}
None => Err("An error occured during the conversion of the given currency"),
}
}
fn help(&self) -> &str {
"usage: currency value from_currency to_currency\r\n\
example: {0} currency 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"
}
fn invalid_command(&self) -> &str {
"Incorrect Command. \
Send \"currency help\" for help."
}
}
impl Plugin for Currency {
fn execute(&self, _: &IrcClient, _: &Message) -> ExecutionStatus {
ExecutionStatus::Done
}
fn execute_threaded(&self, _: &IrcClient, _: &Message) -> Result<(), FrippyError> {
panic!("Currency does not implement the execute function!")
}
fn command(&self, client: &IrcClient, mut command: PluginCommand) -> Result<(), FrippyError> {
if command.tokens.is_empty() {
return Ok(client
.send_notice(&command.source, &self.invalid_command())
.context(FrippyErrorKind::Connection)?);
}
match command.tokens[0].as_ref() {
"help" => Ok(client
.send_notice(&command.source, self.help())
.context(FrippyErrorKind::Connection)?),
_ => match self.convert(&mut command) {
Ok(msg) => Ok(client
.send_privmsg(&command.target, &msg)
.context(FrippyErrorKind::Connection)?),
Err(msg) => Ok(client
.send_notice(&command.source, &msg)
.context(FrippyErrorKind::Connection)?),
},
}
}
fn evaluate(&self, _: &IrcClient, mut command: PluginCommand) -> Result<String, String> {
if command.tokens.is_empty() {
return Err(self.invalid_command().to_owned());
}
match command.tokens[0].as_ref() {
"help" => Ok(self.help().to_owned()),
_ => self.convert(&mut command).map_err(|e| e.to_owned()),
}
}
}
|
