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// SPDX-License-Identifier: LGPL-3.0-or-later
//
// Copyright 2019 Hristo Venev
use crate::{config, fileutil, model, proto, wg};
use std::ffi::OsString;
use std::io;
use std::path::PathBuf;
use std::time::{Duration, Instant, SystemTime};
struct Source {
config: config::Source,
data: proto::Source,
next_update: Instant,
backoff: Option<Duration>,
}
mod updater;
pub use updater::load_source;
mod builder;
pub struct Manager {
dev: wg::Device,
global_config: config::GlobalConfig,
sources: Vec<Source>,
current: model::Config,
state_path: PathBuf,
updater: updater::Updater,
}
impl Manager {
pub fn new(ifname: OsString, c: config::Config) -> io::Result<Self> {
let runtime_directory = c.runtime_directory.ok_or_else(|| {
io::Error::new(io::ErrorKind::InvalidInput, "runtime directory required")
})?;
let mut state_path = runtime_directory;
state_path.push("state.json");
let mut m = Self {
dev: wg::Device::open(ifname)?,
global_config: c.global,
sources: vec![],
current: model::Config::empty(),
state_path,
updater: updater::Updater::new(c.updater),
};
let _ = m.current_load();
for cfg in c.sources {
m.add_source(cfg)?;
}
Ok(m)
}
fn current_load(&mut self) -> bool {
let data = match fileutil::load(&self.state_path) {
Ok(Some(data)) => data,
Ok(None) => {
return false;
}
Err(e) => {
eprintln!("<3>Failed to read interface state: {}", e);
return false;
}
};
let mut de = serde_json::Deserializer::from_slice(&data);
match serde::Deserialize::deserialize(&mut de) {
Ok(c) => {
self.current = c;
true
}
Err(e) => {
eprintln!("<3>Failed to load interface state: {}", e);
false
}
}
}
fn current_update(&mut self, c: &model::Config) {
let data = serde_json::to_vec(c).unwrap();
match fileutil::update(&self.state_path, &data) {
Ok(()) => {}
Err(e) => {
eprintln!("<3>Failed to persist interface state: {}", e);
}
}
}
fn add_source(&mut self, config: config::Source) -> io::Result<()> {
let mut s = Source {
config,
data: proto::Source::empty(),
next_update: Instant::now(),
backoff: None,
};
self.init_source(&mut s)?;
self.sources.push(s);
Ok(())
}
fn init_source(&mut self, s: &mut Source) -> io::Result<()> {
if self.updater.update(s).0 {
return Ok(());
}
if self.updater.cache_load(s) {
return Ok(());
}
if !s.config.required {
return Ok(());
}
if self.updater.update(s).0 {
return Ok(());
}
if self.updater.update(s).0 {
return Ok(());
}
Err(io::Error::new(
io::ErrorKind::Other,
format!("failed to update required source [{}]", &s.config.url),
))
}
fn make_config(
&self,
public_key: model::Key,
ts: SystemTime,
) -> (model::Config, Vec<builder::Error>, SystemTime) {
let mut t_cfg = ts + Duration::from_secs(1 << 20);
let mut sources: Vec<(&Source, &proto::SourceConfig)> = vec![];
for src in &self.sources {
let sc = src
.data
.next
.as_ref()
.and_then(|next| {
if ts >= next.0 {
Some(&next.1)
} else {
t_cfg = t_cfg.min(next.0);
None
}
})
.unwrap_or(&src.data.config);
sources.push((src, sc));
}
let mut cfg = builder::ConfigBuilder::new(public_key, &self.global_config);
for (src, sc) in &sources {
for peer in &sc.servers {
cfg.add_server(src, peer);
}
}
for (src, sc) in &sources {
for peer in &sc.road_warriors {
cfg.add_road_warrior(src, peer);
}
}
let (cfg, errs) = cfg.build();
(cfg, errs, t_cfg)
}
fn refresh(&mut self) -> io::Result<Instant> {
let refresh = self.updater.refresh_time();
let mut now = Instant::now();
let mut t_refresh = now + refresh;
for src in &mut self.sources {
if now >= src.next_update {
now = self.updater.update(src).1;
}
t_refresh = t_refresh.min(src.next_update);
}
Ok(t_refresh)
}
pub fn update(&mut self) -> io::Result<Instant> {
let t_refresh = self.refresh()?;
let public_key = self.dev.get_public_key()?;
let now = Instant::now();
let sysnow = SystemTime::now();
let (config, errors, t_cfg) = self.make_config(public_key, sysnow);
let time_to_cfg = t_cfg
.duration_since(sysnow)
.unwrap_or(Duration::from_secs(0));
let t_cfg = now + time_to_cfg;
if config != self.current {
if errors.is_empty() {
eprintln!("<5>Applying configuration update");
} else {
eprint!(
"<{}>New update contains errors: ",
if errors.iter().any(|err| err.important()) {
'4'
} else {
'5'
}
);
for err in &errors {
eprint!("{}; ", err);
}
eprintln!("applying anyway");
}
self.dev.apply_diff(&self.current, &config)?;
self.current_update(&config);
self.current = config;
}
Ok(if t_cfg < t_refresh {
eprintln!("<6>Next configuration update after {:.1?}", time_to_cfg);
t_cfg
} else if t_refresh > now {
t_refresh
} else {
eprintln!("<4>Next refresh immediately?");
now
})
}
}
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