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// Copyright 2019 Hristo Venev
//
// See COPYING.
use super::{load_file, update_file, Source};
use crate::{config, proto};
use std::ffi::{OsStr, OsString};
use std::path::PathBuf;
use std::time::{Duration, Instant};
use std::{fs, io};
pub(super) struct Updater {
config: config::UpdaterConfig,
}
impl Updater {
pub fn new(config: config::UpdaterConfig) -> Self {
Self { config }
}
fn cache_path(&self, s: &Source) -> Option<PathBuf> {
let mut p = self.config.cache_directory.as_ref()?.clone();
p.push(&s.name);
Some(p)
}
fn cache_update(&self, src: &Source) {
let path = match self.cache_path(src) {
Some(v) => v,
None => return,
};
let data = serde_json::to_vec(&src.data).unwrap();
match update_file(&path, &data) {
Ok(()) => {}
Err(e) => {
eprintln!("<4>Failed to cache [{}]: {}", &src.name, e);
}
}
}
pub fn cache_load(&self, src: &mut Source) -> bool {
let path = match self.cache_path(src) {
Some(v) => v,
None => return false,
};
let data = match load_file(&path) {
Ok(Some(data)) => data,
Ok(None) => {
return false;
}
Err(e) => {
eprintln!("<3>Failed to read [{}] from cache: {}", &src.name, e);
return false;
}
};
let mut de = serde_json::Deserializer::from_slice(&data);
src.data = match serde::Deserialize::deserialize(&mut de) {
Ok(r) => r,
Err(e) => {
eprintln!("<3>Failed to load [{}] from cache: {}", &src.name, e);
return false;
}
};
true
}
pub fn update(&self, src: &mut Source) -> (bool, Instant) {
let refresh = self.refresh_time();
let r = fetch_source(&src.config.url);
let now = Instant::now();
let r = match r {
Ok(r) => {
eprintln!("<6>Updated [{}]", &src.config.url);
src.data = r;
src.backoff = None;
src.next_update = now + refresh;
self.cache_update(src);
return (true, now);
}
Err(r) => r,
};
let b = src
.backoff
.unwrap_or_else(|| Duration::from_secs(10).min(refresh / 10));
src.next_update = now + b;
src.backoff = Some((b + b / 3).min(refresh / 3));
eprintln!(
"<3>Failed to update [{}], retrying after {:.1?}: {}",
&src.config.url, b, &r
);
(false, now)
}
pub fn refresh_time(&self) -> Duration {
Duration::from_secs(u64::from(self.config.refresh_sec))
}
}
fn fetch_source(url: &str) -> io::Result<proto::Source> {
use std::env;
use std::process::{Command, Stdio};
let curl = match env::var_os("CURL") {
None => OsString::new(),
Some(v) => v,
};
let mut proc = Command::new(if curl.is_empty() {
OsStr::new("curl")
} else {
curl.as_os_str()
});
proc.stdin(Stdio::null());
proc.stdout(Stdio::piped());
proc.stderr(Stdio::piped());
proc.arg("-gsSfL");
proc.arg("--fail-early");
proc.arg("--max-time");
proc.arg("10");
proc.arg("--max-filesize");
proc.arg("1M");
proc.arg("--");
proc.arg(url);
let out = proc.output()?;
if !out.status.success() {
let msg = String::from_utf8_lossy(&out.stderr);
let msg = msg.replace('\n', "; ");
return Err(io::Error::new(io::ErrorKind::Other, msg));
}
let mut de = serde_json::Deserializer::from_slice(&out.stdout);
let r = serde::Deserialize::deserialize(&mut de)?;
Ok(r)
}
pub fn load_source(path: &OsStr) -> io::Result<proto::Source> {
let mut data = Vec::new();
{
use std::io::Read;
let mut f = fs::File::open(&path)?;
f.read_to_end(&mut data)?;
}
let mut de = serde_json::Deserializer::from_slice(&data);
let r = serde::Deserialize::deserialize(&mut de)?;
Ok(r)
}
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