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use std::str;
use std::io::{self, Read};
use reqwest::Client;
use reqwest::header::Connection;
use error::FrippyError;
pub fn download(max_kib: usize, url: &str) -> Result<String, FrippyError> {
let mut response = Client::new().get(url).header(Connection::close()).send()?;
let mut body = String::new();
// 100 kibibyte buffer
let mut buf = [0; 100 * 1024];
let mut written = 0;
let mut vec = Vec::new();
let mut end_of_valid = None;
// Read until we reach EOF or max_kib KiB
loop {
if let Some(eov) = end_of_valid {
vec = vec[..eov].to_vec();
}
let len = match response.read(&mut buf) {
Ok(0) => break,
Ok(len) => len,
Err(ref e) if e.kind() == io::ErrorKind::Interrupted => continue,
Err(e) => Err(e)?,
};
vec.extend_from_slice(&buf);
end_of_valid = None;
let body_slice = match str::from_utf8(&vec[..len]) {
Ok(slice) => slice,
Err(e) => {
let valid = e.valid_up_to();
if valid == 0 {
Err(e)?;
}
end_of_valid = Some(valid);
str::from_utf8(&buf[..valid])?
}
};
body.push_str(body_slice);
written += len;
// Check if the file is too large to download
if written > max_kib * 1024 {
Err(FrippyError::DownloadLimit { limit: max_kib })?;
}
}
Ok(body)
}
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