Re: [pmg-devel] [PATCH pmg-log-tracker] fix #3657: allow parsing mail.log files

[Stoiko Ivanov <s.ivanov@proxmox.com>]

On Wed, 6 Oct 2021 13:51:53 +0200
Thomas Lamprecht <t.lamprecht@proxmox.com> wrote:

> On 06.10.21 13:46, Oguz Bektas wrote:
> > with an optional "--maillog" parameter, we parse /var/log/mail.log.*
> > instead of /var/log/syslog.*  
> 
> --mail-log
> 
> and it may make sense to allow passing a base path to that, that would also allow easier
> evaluation like copy of the logs from the production system and run queries on another,
> not so important, system.
+1 for providing a base-path - I'd even go one further and let it deal
with the optionally gzipped logs by matching the filename (for .gz)
instead of the 'index' (assuming that the first and second file are not
compressed, and all consecutive files are).

With that (and the assumption that `logrotate` is used) this would
probably be usable in a configurable way for the GUI+Tracking Center)

Question is from a UX point of view how much a '-i' for single logfile and
a '--mail-log' for a pattern of logfiles makes sense.


> 
> > 
> > Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
> > ---
> >  src/main.rs | 49 ++++++++++++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 48 insertions(+), 1 deletion(-)
> > 
> > diff --git a/src/main.rs b/src/main.rs
> > index b1d4f8c..13ca63b 100644
> > --- a/src/main.rs
> > +++ b/src/main.rs
> > @@ -39,6 +39,11 @@ fn main() -> Result<(), Error> {
> >                  .help("Input file to use instead of /var/log/syslog, or '-' for stdin")
> >                  .value_name("INPUTFILE"),
> >          )
> > +        .arg(
> > +            Arg::with_name("maillog")
> > +                .long("maillog")
> > +                .help("Use /var/log/mail.log* files instead of /var/log/syslog")
> > +        )
> >          .arg(
> >              Arg::with_name("host")
> >                  .short("h")
> > @@ -1816,7 +1821,11 @@ impl Parser {
> >              let filecount = self.count_files_in_time_range();
> >              for i in (0..filecount).rev() {
> >                  self.current_month = 0;
> > -                if let Ok(file) = File::open(LOGFILES[i]) {
> > +                let mut target_files = LOGFILES;
> > +                if self.options.maillog {
> > +                    target_files = MAILLOGFILES;
> > +                }  
> 
> that can be done nicer in rust avoiding mut completely, either use the fact
> that if statements can return expressions or the match feature, e.g. the former:
> 
> let target_files = if self.options.maillog { MAILLOGFILES } else { LOGFILES };
> 
> avoiding mut is nicer for saner programs and allows often better optimizations.
> 
> > +                if let Ok(file) = File::open(target_files[i]) {
> >                      self.current_file_index = i;
> >                      if i > 1 {
> >                          let gzdecoder = read::GzDecoder::new(file);
> > @@ -1988,6 +1997,8 @@ impl Parser {
> >              self.options.inputfile = inputfile.to_string();
> >          }
> >  
> > +        self.options.maillog = args.is_present("maillog");
> > +
> >          if let Some(start) = args.value_of("start") {
> >              if let Ok(res) = time::strptime(&start, "%F %T") {
> >                  self.options.start = mkgmtime(&res);
> > @@ -2121,6 +2132,7 @@ struct Options {
> >      end: libc::time_t,
> >      limit: u64,
> >      verbose: u32,
> > +    maillog: bool,
> >      exclude_greylist: bool,
> >      exclude_ndr: bool,
> >  }
> > @@ -2208,6 +2220,41 @@ fn mkgmtime(tm: &time::Tm) -> libc::time_t {
> >      res
> >  }
> >  
> > +const MAILLOGFILES: [&str; 32] = [
> > +    "/var/log/mail.log",
> > +    "/var/log/mail.log.1",
> > +    "/var/log/mail.log.2.gz",
> > +    "/var/log/mail.log.3.gz",
> > +    "/var/log/mail.log.4.gz",
> > +    "/var/log/mail.log.5.gz",
> > +    "/var/log/mail.log.6.gz",
> > +    "/var/log/mail.log.7.gz",
> > +    "/var/log/mail.log.8.gz",
> > +    "/var/log/mail.log.9.gz",
> > +    "/var/log/mail.log.10.gz",
> > +    "/var/log/mail.log.11.gz",
> > +    "/var/log/mail.log.12.gz",
> > +    "/var/log/mail.log.13.gz",
> > +    "/var/log/mail.log.14.gz",
> > +    "/var/log/mail.log.15.gz",
> > +    "/var/log/mail.log.16.gz",
> > +    "/var/log/mail.log.17.gz",
> > +    "/var/log/mail.log.18.gz",
> > +    "/var/log/mail.log.19.gz",
> > +    "/var/log/mail.log.20.gz",
> > +    "/var/log/mail.log.21.gz",
> > +    "/var/log/mail.log.22.gz",
> > +    "/var/log/mail.log.23.gz",
> > +    "/var/log/mail.log.24.gz",
> > +    "/var/log/mail.log.25.gz",
> > +    "/var/log/mail.log.26.gz",
> > +    "/var/log/mail.log.27.gz",
> > +    "/var/log/mail.log.28.gz",
> > +    "/var/log/mail.log.29.gz",
> > +    "/var/log/mail.log.30.gz",
> > +    "/var/log/mail.log.31.gz",
> > +];  
> 
> 
> could be an iterator (good if we want to allow an arbitrary base) or using a
> const fn (for a fixed one like here)...
> 
> > +
> >  const LOGFILES: [&str; 32] = [
> >      "/var/log/syslog",
> >      "/var/log/syslog.1",
> >   
> 
> 
> 
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