1 // Copyright 2021 Ian Jackson, yaahc and contributors to Hippotat and Eyre
2 // SPDX-License-Identifier: GPL-3.0-or-later
3 // There is NO WARRANTY.
7 #[derive(StructOpt,Debug)]
9 /// Increase debug level
11 /// May be repeated for more verbosity.
13 /// When using syslog, one `-D` this arranges to send to syslog even
14 /// trace messages (mapped onto syslog level `DEBUG`);
15 /// and two -`D` means to send to syslog even messages from lower layers
16 /// (normally just the hippotat modules log to
18 #[structopt(long, short="D", parse(from_occurrences))]
21 /// Syslog facility to use
22 #[structopt(long, parse(try_from_str=parse_syslog_facility))]
23 syslog_facility: Option<syslog::Facility>,
27 fn parse_syslog_facility(s: &str) -> syslog::Facility {
28 s.parse().map_err(|()| anyhow!("unrecognised syslog facility: {:?}", s))?
32 struct FilteringLogWrapper<T>(T);
34 impl<T> FilteringLogWrapper<T> {
35 fn wanted(&self, md: &log::Metadata<'_>) -> bool {
36 let first = |mod_path| {
37 let mod_path: &str = mod_path; // can't do in args as breaks lifetimes
38 mod_path.split_once("::").map(|s| s.0).unwrap_or(mod_path)
40 first(md.target()) == first(module_path!())
44 impl<T> log::Log for FilteringLogWrapper<T> where T: log::Log {
45 fn enabled(&self, md: &log::Metadata<'_>) -> bool {
46 self.wanted(md) && self.0.enabled(md)
49 fn log(&self, record: &log::Record<'_>) {
50 if self.wanted(record.metadata()) {
62 pub fn log_init(&self) {
63 if let Some(facility) = self.syslog_facility {
64 let f = syslog::Formatter3164 {
67 process: "hippotatd".into(),
68 pid: std::process::id(),
70 let l = syslog::unix(f)
71 // syslog::Error is not Sync.
72 // https://github.com/Geal/rust-syslog/issues/65
73 .map_err(|e| anyhow!(e.to_string()))
74 .context("set up syslog logger")?;
75 let l = syslog::BasicLogger::new(l);
76 let l = if self.debug < 2 {
77 Box::new(FilteringLogWrapper(l)) as _
81 log::set_boxed_logger(l).context("install syslog logger")?;
82 log::set_max_level(if self.debug < 1 {
83 log::LevelFilter::Debug
85 log::LevelFilter::Trace
88 let env = env_logger::Env::new()
89 .filter("HIPPOTAT_LOG")
90 .write_style("HIPPOTAT_LOG_STYLE");
92 let mut logb = env_logger::Builder::new();
93 logb.filter(Some("hippotat"),
94 *[ log::LevelFilter::Info,
95 log::LevelFilter::Debug ]
98 &log::LevelFilter::Trace
106 pub struct OptionPrefixColon<T>(pub Option<T>);
107 impl<T:Display> Display for OptionPrefixColon<T> {
108 #[throws(fmt::Error)]
109 fn fmt(&self, f: &mut fmt::Formatter) {
110 if let Some(x) = &self.0 { write!(f, "{}: ", x)? }
114 // For clients only, really.
115 pub struct Reporter<'r> {
116 ic: &'r InstanceConfig,
118 last_report: Option<Report>,
127 // Reporting strategy
128 // - report all errors
129 // - report first success after a period of lack of messages
130 // - if error, report last success
132 impl<'r> Reporter<'r> {
133 pub fn new(ic: &'r InstanceConfig) -> Self { Reporter {
139 pub fn success(&mut self) {
141 let now = Instant::now();
142 if let Some(rep) = &self.last_report {
143 if now - rep.when < match rep.ok {
144 Ok(()) => match self.ic.success_report_interval {
145 z if z == Duration::default() => return,
148 Err(()) => self.ic.effective_http_timeout,
154 info!(target:"hippotat", "{} ({}ok): running", self.ic, self.successes);
155 self.last_report = Some(Report { when: now, ok: Ok(()) });
158 pub fn filter<T>(&mut self, req_num: Option<ReqNum>, r: Result<T,AE>)
160 let now = Instant::now();
167 let mut m = self.ic.to_string();
168 if let Some(req_num) = req_num {
169 write!(m, " #{}", req_num)?;
171 if self.successes > 0 {
172 write!(m, " ({}ok)", self.successes)?;
175 write!(m, ": {}", e)?;
176 Ok::<_,fmt::Error>(m)
178 warn!(target:"hippotat", "{}", m);
179 self.last_report = Some(Report { when: now, ok: Err(()) });
186 use backtrace::Backtrace;
188 use indenter::indented;
191 struct EyreDedupHandler {
192 backtrace: Option<Arc<parking_lot::Mutex<Backtrace>>>,
195 type EyreDynError<'r> = &'r (dyn std::error::Error + 'static);
197 impl eyre::EyreHandler for EyreDedupHandler {
198 #[throws(fmt::Error)]
199 fn display(&self, error: EyreDynError, f: &mut fmt::Formatter) {
200 let mut last: Option<String> = None;
201 let mut error = Some(error);
202 while let Some(e) = error {
203 let m = e.to_string();
205 None => write!(f, "{}", m)?,
206 Some(l) if l.contains(&m) => { },
207 Some(_) => write!(f, ": {}", m)?,
214 #[throws(fmt::Error)]
215 fn debug(&self, error: EyreDynError, f: &mut fmt::Formatter) {
217 return core::fmt::Debug::fmt(error, f)?;
220 write!(f, "{}", error)?;
222 if let Some(cause) = error.source() {
223 write!(f, "\n\nCaused by:")?;
224 let multiple = cause.source().is_some();
226 for (n, error) in Chain::new(cause).enumerate() {
229 write!(indented(f).ind(n), "{}", error)?;
231 write!(indented(f), "{}", error)?;
236 if let Some(bt) = &self.backtrace {
237 let mut bt = bt.lock();
239 write!(f, "\n\nStack backtrace:\n{:?}", bt)?;
245 pub fn dedup_eyre_setup() {
246 eyre::set_hook(Box::new(|_error| {
248 static ref BACKTRACE: bool = {
249 match env::var("RUST_BACKTRACE") {
250 Ok(s) if s.starts_with("1") => true,
251 Ok(s) if s == "0" => false,
252 Err(env::VarError::NotPresent) => false,
254 eprintln!("warning: RUST_BACKTRACE not understood: {:?}", x);
260 let backtrace = if *BACKTRACE {
261 let bt = Backtrace::new_unresolved();
262 let bt = Arc::new(bt.into());
267 Box::new(EyreDedupHandler { backtrace })
269 .context("set error handler")?;
272 const MAX_WARNINGS: usize = 15;
274 #[derive(Debug,Default)]
275 pub struct Warnings {
276 pub warnings: Vec<String>,
279 #[derive(Debug,Error)]
280 #[error("too many warnings")]
281 pub struct TooManyWarnings;
284 #[throws(TooManyWarnings)]
285 pub fn add(&mut self, e: &dyn Display) {
286 if self.warnings.len() >= MAX_WARNINGS { throw!(TooManyWarnings) }
287 self.warnings.push(e.to_string());