php-ebpf/table.cpp

#include "table.h"

//BaseTable::BaseTable(ebpf::BPF *bpf_instance, const std::string &tb_name)
//: bpf(bpf_instance), tb_name(tb_name){}

void BaseTable::printName() {
	std::cout << "Table name: " << tb_name << std::endl;
}

std::string cb_fn;

void PerfEventArrayTable::callbackfn(void *cookie, void *data, int data_size) {
	Php::Value phpData((const char *) data, data_size);
	Php::call(cb_fn.c_str(), nullptr, phpData, data_size);
}

void PerfEventArrayTable::php_open_perf_buffer(Php::Parameters &params) {
	cb_fn = params[0].stringValue();
	auto res = this->bpf->open_perf_buffer(this->tb_name, &PerfEventArrayTable::callbackfn);
	if (!res.ok()) {
		throw Php::Exception("open_perf_buffer error:" + res.msg());
	}
}

int PerfEventArrayTable::perf_buffer_poll(int timeout_ms) {
	return bpf->poll_perf_buffer(this->tb_name, timeout_ms); // perf_reader_event_read
}

Php::Value ArrayTable::php_get_value(Php::Parameters &param) {
	auto index = param[0].numericValue();
	// todo val type
	uint64_t val;
	auto table = bpf->get_array_table<uint64_t>(tb_name);
	auto res = table.get_value(index, val);
	if (!res.ok()) {
		throw Php::Exception("Get value error in" + std::string(tb_name));
	}
	Php::Value phpValue = static_cast<int64_t>(val);
	return phpValue;
}

Php::Value StackTraceTable::php_get_values(Php::Parameters &param) {
	auto stack_id = param[0].numericValue();
	int pid = -1;
	if (param.size() > 1) {
		auto param_pid = param[1].numericValue();
		if (param_pid >= 0) pid = param_pid;
	}
	auto table = bpf->get_stack_table(tb_name);

	auto symbols = table.get_stack_symbol((int) stack_id, (int) pid);
	std::vector<std::string> result;
	for (const auto &str: symbols) {
		result.push_back(Php::Value(str));
	}
	return Php::Array(result);
}

std::string trim_braces(const std::string& input) {
	std::string result = input;

	if (result.size() >= 2 && result.substr(0, 2) == "{ ") {
		result = result.substr(2);
	}

	if (result.size() >= 2 && result.substr(result.size() - 2) == " }") {
		result = result.substr(0, result.size() - 2);
	}

	return result;
}

Php::Value HashTable::php_get_values() {
	Php::Array result;
	std::vector<std::pair<std::vector<char>, std::vector<char>>> entries;

	auto raw_table = bpf->get_table(tb_name);
	auto status = raw_table.get_table_offline_ptr(entries);
	if (status.code() != 0) {
		return result;
	}

	int i = 0;

	for (const auto& [key_data, val_data] : entries) {
		Php::Value phpKeyData(key_data.data(), key_data.size());
		Php::Value phpValData(val_data.data(), val_data.size());

		Php::Array entry;
		entry.set("key", phpKeyData);
		entry.set("value", phpValData);

		result.set(i++, entry);
	}

	return result;
}

void HashTable::php_clear() {
	auto raw_table = bpf->get_table(tb_name);
	raw_table.clear_table_non_atomic();
}

Php::Value PerCpuArrayTable::php_sum_value(Php::Parameters &param) {
	auto index = param[0].numericValue();
	std::vector<unsigned long> val;
	auto table = bpf->get_percpu_array_table<uint64_t>(tb_name);
	auto res = table.get_value(index, val);
	if (!res.ok()) {
		throw Php::Exception("Get value error in" + std::string(tb_name));
	}
	unsigned long long sum = 0;
	for (const auto &v: val) {
		sum += v;
	}
	Php::Value phpValue = static_cast<int64_t>(sum);
	return phpValue;
}