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cluster/Telemetry: Cache CallExpr locations

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This commit is contained in:
Arne Welzel 2025-06-26 17:51:22 +02:00
parent be8b4747c4
commit 73e55fa909
1 changed files with 28 additions and 13 deletions
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41
src/cluster/Telemetry.cc
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@ -127,28 +127,44 @@ void VerboseTelemetry::OnIncomingEvent(std::string_view topic, std::string_view
namespace {
std::string determine_script_location() {
std::string result = "none";
if ( zeek::detail::call_stack.empty() )
return result;
// Cached lookup of a script location.
std::string_view determine_script_location() {
// Global cache for CallExpr pointers to their location.
static std::map<const zeek::detail::CallExpr*, std::string> location_cache;
ssize_t sidx = static_cast<ssize_t>(zeek::detail::call_stack.size()) - 1;
while ( sidx >= 0 ) {
const auto* func = zeek::detail::call_stack[sidx].func;
const auto* ce = zeek::detail::call_stack[sidx].call;
// without_zeekpath_component looks pretty expensive and might be
// better to cache the result using the ce pointer instead of computing
// it over and over again.
// Cached?
if ( auto it = location_cache.find(ce); it != location_cache.end() )
return it->second;
// Future: Ignore wrapper functions if we ever come across some.
// We only care about Broker::publish() and Cluster::publish() and
// these aren't wrapped, so currently nothing to do here.
//
// if ( ignore func ) {
// --sidx;
// continue;
// }
//
// Check Func.cc::emit_builtin_error_common() for inspiration how to
// remove wrapper function.
const auto* loc = ce->GetLocationInfo();
std::string normalized_location = zeek::util::detail::without_zeekpath_component(loc->filename);
result = normalized_location + ":" + std::to_string(loc->first_line);
break;
normalized_location.append(":");
normalized_location.append(std::to_string(loc->first_line));
auto [it, inserted] = location_cache.emplace(ce, std::move(normalized_location));
assert(inserted);
return it->second;
}
return result;
return "none";
}
} // namespace
@ -194,11 +210,10 @@ DebugTelemetry::DebugTelemetry(TopicNormalizer topic_normalizer, std::string_vie
void DebugTelemetry::OnOutgoingEvent(std::string_view topic, std::string_view handler_name,
const SerializationInfo& info) {
auto normalized_topic = topic_normalizer(topic);
std::string script_location = determine_script_location();
labels_view[topic_idx].second = normalized_topic;
labels_view[handler_idx].second = handler_name;
labels_view[script_location_idx].second = script_location;
labels_view[script_location_idx].second = determine_script_location();
const auto& hist = out->GetOrAdd(labels_view);
hist->Observe(static_cast<double>(info.Size()));