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#include <analysis/dispatcher.h>
#include <foundation/scheduler.h>
#include <trace/trace.h>
#include <constants.h>
//------------------------------------------------------------------------------
void Dispatcher::add_analyzer(Analyzer& analyzer)
{
analyzer.subscribe(pending_subs);
}
//------------------------------------------------------------------------------
void Dispatcher::on_new_type(const Type* type)
{
auto [group, name] = type->get_name();
uint32 type_hash = Hash(group) * Hash(name);
for (Subscription& sub : pending_subs)
{
Outline* outline = sub.outline.get();
if (outline->hash != type_hash)
continue;
// Sum of non-array field sizes — the byte length of event.data that
// scalar field reads index into.
uint32 event_size = 0;
for (uint32 i = 0, n = type->get_field_count(); i < n; ++i)
event_size += type->get_field(i).get_size();
for (uint32 i = 0; i < type->get_field_count(); ++i)
{
auto [field_name, field] = type->get_field_info(i);
uint32 field_hash = Hash(field_name);
for (Outline::FieldBase* f = outline->fields(); f->hash; ++f)
{
if (f->hash != field_hash)
continue;
uint32 type_info = field.get_type_info();
uint32 offset = field.get_offset();
// Scalar fields are read via event.data + offset. Validate the
// offset and element size against event_size so a malicious
// utrace can't make Outline::Field memcpy past the event
// payload. Array/string fields are read from aux and ignore
// offset.
if ((type_info & TYPE_INFO_CAT_ARRAY) == 0)
{
uint32 element_size = 1u << (type_info & TYPE_INFO_SIZE_MASK);
if (offset > event_size || element_size > event_size - offset)
break;
}
f->type_info = uint8(type_info);
f->offset = int16(offset);
f->set = 1;
f->index = i;
break;
}
}
uint32 uid = type->get_uid();
if (uid >= dispatchers.size())
{
uint32 new_size = (uid + 16) & ~15;
dispatchers.resize(new_size);
}
std::swap(sub, pending_subs.back());
dispatchers[uid] = std::move(pending_subs.back());
pending_subs.pop_back();
break;
}
}
//------------------------------------------------------------------------------
void Dispatcher::on_parcel(const EventParcel& parcel)
{
if (!pending_subs.empty())
for (const Type* type : parcel.new_types)
on_new_type(type);
if (dispatchers.empty())
return;
for (const Event& event : parcel.events)
{
uint32 uid = event.uid;
if (uid >= dispatchers.size())
continue;
const Subscription& sub = dispatchers[uid];
Outline* outline = sub.outline.get();
if (outline == nullptr)
continue;
outline->event = &event;
auto* analyzer = (Analyzer*)(sub.analyzer);
(analyzer->*(sub.sink))(*outline);
}
}
//------------------------------------------------------------------------------
void Dispatcher::run(DataSource& data_source)
{
Allocator allocator;
Preamble preamble(data_source, allocator);
Transport transport = preamble.get_transport();
Protocol protocol = preamble.get_protocol();
#if 0
Scheduler scheduler({
.concurrency = 3
});
struct State {
Bundle bundle;
Packet packets[128];
EventParcel parcel;
};
State states[3];
Task transport_task;
Task protocol_task;
Task analysis_task;
auto analysis_entry = [&, index=uint32(0)] () mutable {
auto& parcel = states[index].parcel;
on_parcel(parcel);
};
auto protocol_entry = [&, index=uint32(0)] () mutable {
auto& parcel = states[index].parcel;
auto& bundle = states[index].bundle;
parcel.reset();
protocol.read(parcel, bundle);
};
auto transport_entry = [&, index=uint32(0)] () mutable {
auto& bundle = states[index].bundle;
auto& packets = states[index].packets;
bundle = transport.read_packets(packets);
};
while (true)
{
transport_task = scheduler.create("transport", transport_entry);
protocol_task = scheduler.create("protocol", protocol_entry);
analysis_task = scheduler.create("analysis", analysis_entry);
scheduler.start_after(protocol_task, transport_task);
scheduler.start_after(analysis_task, protocol_task);
scheduler.submit(transport_task);
scheduler.wait(analysis_task);
};
#else
Packet packets[128];
EventParcel parcel;
while (Bundle bundle = transport.read_packets(packets))
{
parcel.reset();
protocol.read(parcel, bundle);
on_parcel(parcel);
}
#endif // 0
}
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