[generic_log] nanosecond-precision timestamps

Author: Yukigaru

src/log_format_impls.cc

@@ -148,7 +148,7 @@ class generic_log_format : public log_format {
         static const pcre_format log_fmt[] = {
             pcre_format(R"(^(?:\*\*\*\s+)?(?<timestamp>@[0-9a-zA-Z]{16,24}))"),
             pcre_format(
-                R"(^(?:\*\*\*\s+)?(?<timestamp>(?:\s|\d{4}[\-\/]\d{2}[\-\/]\d{2}|T|\d{1,2}:\d{2}(?::\d{2}(?:[\.,]\d{1,6})?)?|Z|[+\-]\d{2}:?\d{2}|(?!DBG|DEBUG|ERR|INFO|WARN|NONE)[A-Z]{3,4})+)[:|\s]?(trc|trace|dbg|debug|info|warn(?:ing)?|err(?:or)?)[:|\s]\s*)"),
+                R"(^(?:\*\*\*\s+)?(?<timestamp>(?:\s|\d{4}[\-\/]\d{2}[\-\/]\d{2}|T|\d{1,2}:\d{2}(?::\d{2}(?:[\.,]\d{1,9})?)?|Z|[+\-]\d{2}:?\d{2}|(?!DBG|DEBUG|ERR|INFO|WARN|NONE)[A-Z]{3,4})+)[:|\s]?(trc|trace|dbg|debug|info|warn(?:ing)?|err(?:or)?)[:|\s]\s*)"),
             pcre_format(
                 R"(^(?:\*\*\*\s+)?(?<timestamp>[\w:+ \.,+/-]+) \[(trace|debug|info|warn(?:ing)?|error|critical)\]\s+)"),
             pcre_format(

test/Makefile.am

@@ -364,6 +364,7 @@ dist_noinst_DATA = \
 	logfile_generic.1 \
 	logfile_generic.2 \
 	logfile_generic.3 \
+	logfile_generic_nanos.0 \
 	logfile_generic_with_header.0 \
 	logfile_glog.0 \
 	logfile_grafana.0 \

test/logfile_generic_nanos.0

@@ -0,0 +1,2 @@
+2025-01-01 00:00:00.123456789:INFO:nano first
+2025-01-01 01:00:00.987654321:WARN:nano second

test/test_logfile.sh

@@ -548,6 +548,13 @@ Jul 02 10:22:40 2012 -- 672
 Oct 08 16:56:38 2014 -- 344
 EOF
 
+run_test ./drive_logfile -t -f generic_log ${srcdir}/logfile_generic_nanos.0
+
+check_output "generic_log nanosecond timestamp not parsed?" <<EOF
+Jan 01 00:00:00 2025 -- 123
+Jan 01 01:00:00 2025 -- 987
+EOF
+
 run_test ./drive_logfile -v -f generic_log ${srcdir}/logfile_generic.0
 
 check_output "generic_log level interpreted incorrectly?" <<EOF