1 // Copyright 2021 Ian Jackson and contributors to Hippotat
2 // SPDX-License-Identifier: AGPL-3.0-or-later
3 // There is NO WARRANTY.
7 use configparser::ini::Ini;
9 #[derive(StructOpt,Debug)]
11 /// Top-level config file or directory
13 /// Look for `main.cfg`, `config.d` and `secrets.d` here.
15 /// Or if this is a file, just read that file.
16 #[structopt(long, default_value="/etc/hippotat")]
19 /// Additional config files or dirs, which can override the others
20 #[structopt(long, multiple=true, number_of_values=1)]
21 pub extra_config: Vec<PathBuf>,
24 pub struct CidrString(pub String);
26 pub struct InstanceConfig {
27 // Exceptional settings
29 pub secret: String, // make a newytpe
33 pub max_batch_down: u32,
34 pub max_queue_time: Duration,
35 pub http_timeout: Duration,
36 pub target_requests_outstanding: u32,
39 pub addrs: Vec<IpAddr>,
40 pub vnetwork: Vec<CidrString>,
41 pub vaddr: Vec<IpAddr>,
45 pub ifname_server: String,
46 pub ifname_client: String,
48 // Ordinary settings, used by server only:
49 pub max_clock_skew: Duration,
51 // Ordinary settings, used by client only:
52 pub http_timeout_grace: Duration,
53 pub max_requests_outstanding: u32,
54 pub max_batch_up: u32,
55 pub http_retry: Duration,
57 pub vroutes: Vec<CidrString>,
60 #[derive(Debug,Clone,Hash,Eq,PartialEq)]
61 pub enum SectionName {
64 Server(ServerName), // includes SERVER, which is slightly special
65 ServerLimit(ServerName),
70 pub use SectionName as SN;
72 #[derive(Debug,Clone,Hash,Eq,PartialEq)]
78 #[derive(Debug,Clone)]
79 struct RawVal { val: Option<String>, loc: Arc<PathBuf> }
80 type SectionMap = HashMap<String, RawVal>;
86 static OUTSIDE_SECTION: &str = "[";
88 #[derive(Default,Debug)]
90 sections: HashMap<SectionName, SectionMap>,
93 type OkAnyway<'f,A> = &'f dyn Fn(ErrorKind) -> Option<A>;
95 impl<'f,A> OkAnyway<'f,A> {
96 fn ok<T>(self, r: &Result<T, io::Error>) -> Option<A> {
97 let e = r.as_ref().err()?;
104 impl FromStr for SectionName {
107 fn from_str(s: &str) -> Self {
109 "COMMON" => return SN::Common,
110 "DEFAULT" => return SN::Default,
111 "LIMIT" => return SN::GlobalLimit,
114 if let Ok(n@ ServerName(_)) = s.parse() { return SN::Server(n) }
115 if let Ok(n@ ClientName(_)) = s.parse() { return SN::Client(n) }
116 let (server, client) = s.split_ascii_whitespace().collect_tuple()
117 .ok_or_else(|| anyhow!(
118 "bad section name {:?} \
119 (must be COMMON, DEFAULT, <server>, <client>, or <server> <client>",
122 let server = server.parse().context("server name in link section name")?;
123 if client == "LIMIT" { return SN::ServerLimit(server) }
124 let client = client.parse().context("client name in link section name")?;
125 SN::Link(LinkName { server, client })
130 #[throws(AE)] // AE does not include path
131 fn read_file<A>(&mut self, path: &Path, anyway: OkAnyway<A>) -> Option<A>
133 let f = fs::File::open(path);
134 if let Some(anyway) = anyway.ok(&f) { return Some(anyway) }
135 let mut f = f.context("open")?;
137 let mut s = String::new();
138 let y = f.read_to_string(&mut s);
139 if let Some(anyway) = anyway.ok(&y) { return Some(anyway) }
142 let mut ini = Ini::new_cs();
143 ini.set_default_section(OUTSIDE_SECTION);
144 ini.read(s).map_err(|e| anyhow!("{}", e)).context("parse as INI")?;
145 let map = mem::take(ini.get_mut_map());
146 if map.get(OUTSIDE_SECTION).is_some() {
147 throw!(anyhow!("INI file contains settings outside a section"));
150 let loc = Arc::new(path.to_owned());
152 for (sn, vars) in map {
153 let sn = sn.parse().dcontext(&sn)?;
154 self.sections.entry(sn)
160 RawVal { val, loc: loc.clone() })
167 #[throws(AE)] // AE includes path
168 fn read_dir_d<A>(&mut self, path: &Path, anyway: OkAnyway<A>) -> Option<A>
170 let dir = fs::read_dir(path);
171 if let Some(anyway) = anyway.ok(&dir) { return Some(anyway) }
172 let dir = dir.context("open directory").dcontext(path)?;
174 let ent = ent.context("read directory").dcontext(path)?;
175 let leaf = ent.file_name();
176 let leaf = leaf.to_str();
177 let leaf = if let Some(leaf) = leaf { leaf } else { continue }; //utf8?
178 if leaf.len() == 0 { continue }
179 if ! leaf.chars().all(
180 |c| c=='-' || c=='_' || c.is_ascii_alphanumeric()
183 // OK we want this one
184 let ent = ent.path();
185 self.read_file(&ent, &|_| None::<Void>).dcontext(&ent)?;
190 #[throws(AE)] // AE includes everything
191 fn read_toplevel(&mut self, toplevel: &Path) {
192 enum Anyway { None, Dir }
193 match self.read_file(toplevel, &|k| match k {
194 EK::NotFound => Some(Anyway::None),
195 EK::IsADirectory => Some(Anyway::Dir),
198 .dcontext(toplevel).context("top-level config directory (or file)")?
200 None | Some(Anyway::None) => { },
202 Some(Anyway::Dir) => {
204 let anyway_none = |k| match k {
205 EK::NotFound => Some(AnywayNone),
209 let mk = |leaf: &str| {
210 [ toplevel, &PathBuf::from(leaf) ]
211 .iter().collect::<PathBuf>()
214 for &(try_main, desc) in &[
215 ("main.cfg", "main config file"),
216 ("master.cfg", "obsolete-named main config file"),
218 let main = mk(try_main);
220 match self.read_file(&main, &anyway_none)
221 .dcontext(main).context(desc)?
224 Some(AnywayNone) => { },
228 for &(try_dir, desc) in &[
229 ("config.d", "per-link config directory"),
230 ("secrets.d", "per-link secrets directory"),
232 let dir = mk(try_dir);
233 match self.read_dir_d(&dir, &anyway_none).context(desc)? {
235 Some(AnywayNone) => { },
242 #[throws(AE)] // AE includes extra, but does that this is extra
243 fn read_extra(&mut self, extra: &Path) {
246 match self.read_file(extra, &|k| match k {
247 EK::IsADirectory => Some(AnywayDir),
254 self.read_dir_d(extra, &|_| None::<Void>)?;
261 enum LinkEnd { Server, Client }
263 struct ResolveContext<'c> {
269 impl<'c> ResolveContext<'c> {
270 fn first_of_raw(&self, key: &str,
271 sections: &[ &dyn Fn() -> SectionName ])
272 -> Option<&'c RawVal> {
273 for section in sections {
274 if let Some(raw) = self.agg.sections
276 .and_then(|vars: &SectionMap| vars.get(key))
285 fn first_of<T>(&self, key: &str,
286 sections: &[ &dyn Fn() -> SectionName ])
290 match self.first_of_raw(key, sections) {
295 .context(r#"in section "{}""#, &raw.section)
301 pub fn ordinary<T>(&self, key: &str) -> T where T: FromStr + Default {
302 self.first_of(key, &[
303 || SN::Link(self.link.clone()),
304 || SN::Client(self.link.client.clone()),
305 || SN::Server(self.link.server.clone()),
311 pub fn limited<T>(&self, key: &str) -> T
312 where T: FromStr + Default + PartialOrd
314 let val = self.ordinary(key);
315 if let Some(limit) = self.first_of(key, &[
316 || SN::LimitServer(self.link.server.clone()),
319 val = min(val, limit)
324 pub fn client<T>(&self, key: &str) -> T where T: FromStr + Default {
326 LinkEnd::Client => self.ordinary(key)?,
327 LinkEnd::Server => default(),
330 pub fn server<T>(&self, key: &str) -> T where T: FromStr + Default {
332 LinkEnd::Server => self.ordinary(key)?,
333 LinkEnd::Client => default(),
337 pub fn special_ipif<T>(&self, key: &str) -> T where T: FromStr + Default {
339 LinkEnd::Client => self.ordinary(key)?,
341 self.first_of(key, &[
343 || SN::Server(self.link.server.clone()),
351 fn resolve_instance_config() {
353 max_batch_down: resolve::limited(&agg, "max_batch_down")
360 let opts = config::Opts::from_args();
363 let mut agg = Aggregate::default();
365 agg.read_toplevel(&opts.config)?;
366 for extra in &opts.extra_config {
367 agg.read_extra(extra).context("extra config")?;
370 eprintln!("GOT {:#?}", agg);
373 })().context("read configuration")?;