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))?
36 impl<T> LogWrapper<T> {
37 fn wanted(&self, md: &log::Metadata<'_>) -> bool {
38 let first = |mod_path| {
39 let mod_path: &str = mod_path; // can't do in args as breaks lifetimes
40 mod_path.split_once("::").map(|s| s.0).unwrap_or(mod_path)
42 first(md.target()) == first(module_path!())
46 impl<T> log::Log for LogWrapper<T> where T: log::Log {
47 fn enabled(&self, md: &log::Metadata<'_>) -> bool {
48 self.wanted(md) && self.output.enabled(md)
51 fn log(&self, record: &log::Record<'_>) {
52 if self.wanted(record.metadata()) {
53 self.output.log(record)
64 pub fn log_init(&self) {
65 if let Some(facility) = self.syslog_facility {
66 let f = syslog::Formatter3164 {
69 process: "hippotatd".into(),
70 pid: std::process::id(),
72 let l = syslog::unix(f)
73 // syslog::Error is not Sync.
74 // https://github.com/Geal/rust-syslog/issues/65
75 .map_err(|e| anyhow!(e.to_string()))
76 .context("set up syslog logger")?;
77 let l = syslog::BasicLogger::new(l);
78 let l = if self.debug < 2 {
79 Box::new(LogWrapper { output: l }) as _
83 log::set_boxed_logger(l).context("install syslog logger")?;
84 log::set_max_level(if self.debug < 1 {
85 log::LevelFilter::Debug
87 log::LevelFilter::Trace
90 let env = env_logger::Env::new()
91 .filter("HIPPOTAT_LOG")
92 .write_style("HIPPOTAT_LOG_STYLE");
94 let mut logb = env_logger::Builder::new();
95 logb.filter(Some("hippotat"),
96 *[ log::LevelFilter::Info,
97 log::LevelFilter::Debug ]
100 &log::LevelFilter::Trace
108 pub struct OptionPrefixColon<T>(pub Option<T>);
109 impl<T:Display> Display for OptionPrefixColon<T> {
110 #[throws(fmt::Error)]
111 fn fmt(&self, f: &mut fmt::Formatter) {
112 if let Some(x) = &self.0 { write!(f, "{}: ", x)? }
116 // For clients only, really.
117 pub struct Reporter<'r> {
118 ic: &'r InstanceConfig,
120 last_report: Option<Report>,
129 // Reporting strategy
130 // - report all errors
131 // - report first success after a period of lack of messages
132 // - if error, report last success
134 impl<'r> Reporter<'r> {
135 pub fn new(ic: &'r InstanceConfig) -> Self { Reporter {
141 pub fn success(&mut self) {
143 let now = Instant::now();
144 if let Some(rep) = &self.last_report {
145 if now - rep.when < match rep.ok {
146 Ok(()) => match self.ic.success_report_interval {
147 z if z == Duration::default() => return,
150 Err(()) => self.ic.effective_http_timeout,
156 info!(target:"hippotat", "{} ({}ok): running", self.ic, self.successes);
157 self.last_report = Some(Report { when: now, ok: Ok(()) });
160 pub fn filter<T>(&mut self, req_num: Option<ReqNum>, r: Result<T,AE>)
162 let now = Instant::now();
169 let mut m = self.ic.to_string();
170 if let Some(req_num) = req_num {
171 write!(m, " #{}", req_num)?;
173 if self.successes > 0 {
174 write!(m, " ({}ok)", self.successes)?;
177 write!(m, ": {}", e)?;
178 Ok::<_,fmt::Error>(m)
180 warn!(target:"hippotat", "{}", m);
181 self.last_report = Some(Report { when: now, ok: Err(()) });
188 use backtrace::Backtrace;
190 use indenter::indented;
193 struct EyreDedupHandler {
194 backtrace: Option<Arc<parking_lot::Mutex<Backtrace>>>,
197 type EyreDynError<'r> = &'r (dyn std::error::Error + 'static);
199 impl eyre::EyreHandler for EyreDedupHandler {
200 #[throws(fmt::Error)]
201 fn display(&self, error: EyreDynError, f: &mut fmt::Formatter) {
202 let mut last: Option<String> = None;
203 let mut error = Some(error);
204 while let Some(e) = error {
205 let m = e.to_string();
207 None => write!(f, "{}", m)?,
208 Some(l) if l.contains(&m) => { },
209 Some(_) => write!(f, ": {}", m)?,
216 #[throws(fmt::Error)]
217 fn debug(&self, error: EyreDynError, f: &mut fmt::Formatter) {
219 return core::fmt::Debug::fmt(error, f)?;
222 write!(f, "{}", error)?;
224 if let Some(cause) = error.source() {
225 write!(f, "\n\nCaused by:")?;
226 let multiple = cause.source().is_some();
228 for (n, error) in Chain::new(cause).enumerate() {
231 write!(indented(f).ind(n), "{}", error)?;
233 write!(indented(f), "{}", error)?;
238 if let Some(bt) = &self.backtrace {
239 let mut bt = bt.lock();
241 write!(f, "\n\nStack backtrace:\n{:?}", bt)?;
247 pub fn dedup_eyre_setup() {
248 eyre::set_hook(Box::new(|_error| {
250 static ref BACKTRACE: bool = {
251 match env::var("RUST_BACKTRACE") {
252 Ok(s) if s.starts_with("1") => true,
253 Ok(s) if s == "0" => false,
254 Err(env::VarError::NotPresent) => false,
256 eprintln!("warning: RUST_BACKTRACE not understood: {:?}", x);
262 let backtrace = if *BACKTRACE {
263 let bt = Backtrace::new_unresolved();
264 let bt = Arc::new(bt.into());
269 Box::new(EyreDedupHandler { backtrace })
271 .context("set error handler")?;
274 const MAX_WARNINGS: usize = 15;
276 #[derive(Debug,Default)]
277 pub struct Warnings {
278 pub warnings: Vec<String>,
281 #[derive(Debug,Error)]
282 #[error("too many warnings")]
283 pub struct TooManyWarnings;
286 #[throws(TooManyWarnings)]
287 pub fn add(&mut self, e: &dyn Display) {
288 if self.warnings.len() >= MAX_WARNINGS { throw!(TooManyWarnings) }
289 self.warnings.push(e.to_string());