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
33 pub max_batch_down: u32,
34 pub max_queue_time: Duration,
35 pub http_timeout: Duration,
38 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 type SectionMap = HashMap<String, Option<String>>;
66 static OUTSIDE_SECTION: &str = "[";
68 #[derive(Default,Debug)]
70 sections: HashMap<String, SectionMap>,
73 type OkAnyway<'f,A> = &'f dyn Fn(ErrorKind) -> Option<A>;
75 impl<'f,A> OkAnyway<'f,A> {
76 fn ok<T>(self, r: &Result<T, io::Error>) -> Option<A> {
77 let e = r.as_ref().err()?;
85 #[throws(AE)] // AE does not include path
86 fn read_file<A>(&mut self, path: &Path, anyway: OkAnyway<A>) -> Option<A>
88 let f = fs::File::open(path);
89 if let Some(anyway) = anyway.ok(&f) { return Some(anyway) }
90 let mut f = f.context("open")?;
92 let mut s = String::new();
93 let y = f.read_to_string(&mut s);
94 if let Some(anyway) = anyway.ok(&y) { return Some(anyway) }
97 let mut ini = Ini::new_cs();
98 ini.set_default_section(OUTSIDE_SECTION);
99 ini.read(s).map_err(|e| anyhow!("{}", e)).context("parse as INI")?;
100 let mut map = mem::take(ini.get_mut_map());
101 if map.get(OUTSIDE_SECTION).is_some() {
102 throw!(anyhow!("INI file contains settings outside a section"));
105 // xxx parse section names here
106 // xxx save Arc<PathBuf> where we found each item
108 self.sections.extend(map.drain());
112 #[throws(AE)] // AE includes path
113 fn read_dir_d<A>(&mut self, path: &Path, anyway: OkAnyway<A>) -> Option<A>
115 let dir = fs::read_dir(path);
116 if let Some(anyway) = anyway.ok(&dir) { return Some(anyway) }
117 let dir = dir.context("open directory").dcontext(path)?;
119 let ent = ent.context("read directory").dcontext(path)?;
120 let leaf = ent.file_name();
121 let leaf = leaf.to_str();
122 let leaf = if let Some(leaf) = leaf { leaf } else { continue }; //utf8?
123 if leaf.len() == 0 { continue }
124 if ! leaf.chars().all(
125 |c| c=='-' || c=='_' || c.is_ascii_alphanumeric()
128 // OK we want this one
129 let ent = ent.path();
130 self.read_file(&ent, &|_| None::<Void>).dcontext(&ent)?;
135 #[throws(AE)] // AE includes everything
136 fn read_toplevel(&mut self, toplevel: &Path) {
137 enum Anyway { None, Dir }
138 match self.read_file(toplevel, &|k| match k {
139 EK::NotFound => Some(Anyway::None),
140 EK::IsADirectory => Some(Anyway::Dir),
143 .dcontext(toplevel).context("top-level config directory (or file)")?
145 None | Some(Anyway::None) => { },
147 Some(Anyway::Dir) => {
149 let anyway_none = |k| match k {
150 EK::NotFound => Some(AnywayNone),
154 let mk = |leaf: &str| {
155 [ toplevel, &PathBuf::from(leaf) ]
156 .iter().collect::<PathBuf>()
159 for &(try_main, desc) in &[
160 ("main.cfg", "main config file"),
161 ("master.cfg", "obsolete-named main config file"),
163 let main = mk(try_main);
165 match self.read_file(&main, &anyway_none)
166 .dcontext(main).context(desc)?
169 Some(AnywayNone) => { },
173 for &(try_dir, desc) in &[
174 ("config.d", "per-link config directory"),
175 ("secrets.d", "per-link secrets directory"),
177 let dir = mk(try_dir);
178 match self.read_dir_d(&dir, &anyway_none).context(desc)? {
180 Some(AnywayNone) => { },
187 #[throws(AE)] // AE includes extra, but does that this is extra
188 fn read_extra(&mut self, extra: &Path) {
191 match self.read_file(extra, &|k| match k {
192 EK::IsADirectory => Some(AnywayDir),
199 self.read_dir_d(extra, &|_| None::<Void>)?;
209 let opts = config::Opts::from_args();
212 let mut agg = Aggregate::default();
214 agg.read_toplevel(&opts.config)?;
215 for extra in &opts.extra_config {
216 agg.read_extra(extra).context("extra config")?;
219 eprintln!("GOT {:?}", agg);
222 })().context("read configuration")?;