#!/usr/bin/perl
#
# Parse event stream and convert individual events into a summary
# record for the process.
#
# Git.exe generates one or more "event" records for each API method,
# such as "start <argv>" and "exit <code>", during the life of the git
# process. Additionally, the input may contain interleaved events
# from multiple concurrent git processes and/or multiple threads from
# within a git process.
#
# Accumulate events for each process (based on its unique SID) in a
# dictionary and emit process summary records.
#
# Convert some of the variable fields (such as elapsed time) into
# placeholders (or omit them) to make HEREDOC comparisons easier in
# the test scripts.
#
# We may also omit fields not (currently) useful for testing purposes.
use strict;
use warnings;
use JSON::PP;
use Data::Dumper;
use Getopt::Long;
# The version of the trace2 event target format that we understand.
# This is reported in the 'version' event in the 'evt' field.
# It comes from the GIT_TRACE2_EVENT_VERSION macro in trace2/tr2_tgt_event.c
my $evt_version = '1';
my $show_children = 1;
my $show_exec = 1;
my $show_threads = 1;
# A hack to generate test HEREDOC data for pasting into the test script.
# Usage:
# cd "t/trash directory.t0212-trace2-event"
# $TT trace ... >trace.event
# VV=$(../../git.exe version | sed -e 's/^git version //')
# perl ../t0212/parse_events.perl --HEREDOC --VERSION=$VV <trace.event >heredoc
# Then paste heredoc into your new test.
my $gen_heredoc = 0;
my $gen_version = '';
GetOptions("children!" => \$show_children,
"exec!" => \$show_exec,
"threads!" => \$show_threads,
"HEREDOC!" => \$gen_heredoc,
"VERSION=s" => \$gen_version )
or die("Error in command line arguments\n");
# SIDs contains timestamps and PIDs of the process and its parents.
# This makes it difficult to match up in a HEREDOC in the test script.
# Build a map from actual SIDs to predictable constant values and yet
# keep the parent/child relationships. For example:
# {..., "sid":"1539706952458276-8652", ...}
# {..., "sid":"1539706952458276-8652/1539706952649493-15452", ...}
# becomes:
# {..., "sid":"_SID1_", ...}
# {..., "sid":"_SID1_/_SID2_", ...}
my $sid_map;
my $sid_count = 0;
my $processes;
while (<>) {
my $line = decode_json( $_ );
my $sid = "";
my $sid_sep = "";
my $raw_sid = $line->{'sid'};
my @raw_sid_parts = split /\//, $raw_sid;
foreach my $raw_sid_k (@raw_sid_parts) {
if (!exists $sid_map->{$raw_sid_k}) {
$sid_map->{$raw_sid_k} = '_SID' . $sid_count . '_';
$sid_count++;
}
$sid = $sid . $sid_sep . $sid_map->{$raw_sid_k};
$sid_sep = '/';
}
my $event = $line->{'event'};
if ($event eq 'version') {
$processes->{$sid}->{'version'} = $line->{'exe'};
if ($gen_heredoc == 1 && $gen_version eq $line->{'exe'}) {
# If we are generating data FOR the test script, replace
# the reported git.exe version with a reference to an
# environment variable. When our output is pasted into
# the test script, it will then be expanded in future
# test runs to the THEN current version of git.exe.
# We assume that the test script uses env var $V.
$processes->{$sid}->{'version'} = "\$V";
}
}
elsif ($event eq 'start') {
$processes->{$sid}->{'argv'} = $line->{'argv'};
$processes->{$sid}->{'argv'}[0] = "_EXE_";
}
elsif ($event eq 'exit') {
$processes->{$sid}->{'exit_code'} = $line->{'code'};
}
elsif ($event eq 'atexit') {
$processes->{$sid}->{'exit_code'} = $line->{'code'};
}
elsif ($event eq 'error') {
# For HEREDOC purposes, use the error message format string if
# available, rather than the formatted message (which probably
# has an absolute pathname).
if (exists $line->{'fmt'}) {
push( @{$processes->{$sid}->{'errors'}}, $line->{'fmt'} );
}
elsif (exists $line->{'msg'}) {
push( @{$processes->{$sid}->{'errors'}}, $line->{'msg'} );
}
}
elsif ($event eq 'cmd_path') {
## $processes->{$sid}->{'path'} = $line->{'path'};
#
# Like in the 'start' event, we need to replace the value of
# argv[0] with a token for HEREDOC purposes. However, the
# event is only emitted when RUNTIME_PREFIX is defined, so
# just omit it for testing purposes.
# $processes->{$sid}->{'path'} = "_EXE_";
}
elsif ($event eq 'cmd_name') {
$processes->{$sid}->{'name'} = $line->{'name'};
$processes->{$sid}->{'hierarchy'} = $line->{'hierarchy'};
}
elsif ($event eq 'alias') {
$processes->{$sid}->{'alias'}->{'key'} = $line->{'alias'};
$processes->{$sid}->{'alias'}->{'argv'} = $line->{'argv'};
}
elsif ($event eq 'def_param') {
my $kv;
$kv->{'param'} = $line->{'param'};
$kv->{'value'} = $line->{'value'};
push( @{$processes->{$sid}->{'params'}}, $kv );
}
elsif ($event eq 'child_start') {
if ($show_children == 1) {
$processes->{$sid}->{'child'}->{$line->{'child_id'}}->{'child_class'} = $line->{'child_class'};
$processes->{$sid}->{'child'}->{$line->{'child_id'}}->{'child_argv'} = $line->{'argv'};
$processes->{$sid}->{'child'}->{$line->{'child_id'}}->{'child_argv'}[0] = "_EXE_";
$processes->{$sid}->{'child'}->{$line->{'child_id'}}->{'use_shell'} = $line->{'use_shell'} ? 1 : 0;
}
}
elsif ($event eq 'child_exit') {
if ($show_children == 1) {
$processes->{$sid}->{'child'}->{$line->{'child_id'}}->{'child_code'} = $line->{'code'};
}
}
# TODO decide what information we want to test from thread events.
elsif ($event eq 'thread_start') {
if ($show_threads == 1) {
}
}
elsif ($event eq 'thread_exit') {
if ($show_threads == 1) {
}
}
# TODO decide what information we want to test from exec events.
elsif ($event eq 'exec') {
if ($show_exec == 1) {
}
}
elsif ($event eq 'exec_result') {
if ($show_exec == 1) {
}
}
elsif ($event eq 'def_param') {
# Accumulate parameter key/value pairs by key rather than in an array
# so that we get overwrite (last one wins) effects.
$processes->{$sid}->{'params'}->{$line->{'param'}} = $line->{'value'};
}
elsif ($event eq 'def_repo') {
# $processes->{$sid}->{'repos'}->{$line->{'repo'}} = $line->{'worktree'};
$processes->{$sid}->{'repos'}->{$line->{'repo'}} = "_WORKTREE_";
}
# A series of potentially nested and threaded region and data events
# is fundamentally incompatibile with the type of summary record we
# are building in this script. Since they are intended for
# perf-trace-like analysis rather than a result summary, we ignore
# most of them here.
# elsif ($event eq 'region_enter') {
# }
# elsif ($event eq 'region_leave') {
# }
elsif ($event eq 'data') {
my $cat = $line->{'category'};
if ($cat eq 'test_category') {
my $key = $line->{'key'};
my $value = $line->{'value'};
$processes->{$sid}->{'data'}->{$cat}->{$key} = $value;
}
}
# This trace2 target does not emit 'printf' events.
#
# elsif ($event eq 'printf') {
# }
}
# Dump the resulting hash into something that we can compare against
# in the test script. These options make Dumper output look a little
# bit like JSON. Also convert variable references of the form "$VAR*"
# so that the matching HEREDOC doesn't need to escape it.
$Data::Dumper::Sortkeys = 1;
$Data::Dumper::Indent = 1;
$Data::Dumper::Purity = 1;
$Data::Dumper::Pair = ':';
my $out = Dumper($processes);
$out =~ s/'/"/g;
$out =~ s/\$VAR/VAR/g;
# Finally, if we're running this script to generate (manually confirmed)
# data to add to the test script, guard the indentation.
if ($gen_heredoc == 1) {
$out =~ s/^/\t\|/gms;
}
print $out;
