main.rs

extern crate curl;
extern crate futures;
extern crate tokio_core;
extern crate tokio_curl;

use tokio_core::reactor::Core;
use tokio_curl::Session;
use std::fs::File;
use std::io::Read;

use curl::easy::{Easy, Form};

fn main() {
    let mut lp = Core::new().unwrap();
    let session = Session::new(lp.handle());

    let mut a = Easy::new();
    let mut form = Form::new();
    
    let mut content = Vec::new();
    let mut file = File::open("test.png").unwrap();
    let size = file.read_to_end(&mut content).unwrap();

    println!("Attempting to send file with {} bytes", size);

    form.part("photo").buffer("test.png", content).content_type("application/octet-stream").add().unwrap();
    
    form.part("chat_id").contents("100".as_bytes()).add().unwrap();

    a.httppost(form).unwrap();

    a.url("https://api.telegram.org/bot<key>/sendPhoto").unwrap();
    //a.url("https://api.telegram.org/botblabla/sendPhoto").unwrap();

    a.debug_function(|_, data| {
       println!("{:?}", String::from_utf8_lossy(data));
    }).unwrap();
    
    a.verbose(true).unwrap();
    
    a.write_function(|data| {
       Ok(data.len())
    }).unwrap();
    
    //a.perform().unwrap();

    let req = session.perform(a);

    lp.run(req).unwrap();
}