szaszm commented on a change in pull request #776:
URL: https://github.com/apache/nifi-minifi-cpp/pull/776#discussion_r428322626
##########
File path: libminifi/src/c2/C2Agent.cpp
##########
@@ -75,54 +78,55 @@ C2Agent::C2Agent(const
std::shared_ptr<core::controller::ControllerServiceProvid
c2_producer_ = [&]() {
// place priority on messages to send to the c2 server
- if (protocol_.load() != nullptr &&
request_mutex.try_lock_for(std::chrono::seconds(1))) {
- std::lock_guard<std::timed_mutex> lock(request_mutex, std::adopt_lock);
- if (!requests.empty()) {
- int count = 0;
- do {
- const C2Payload payload(std::move(requests.back()));
- requests.pop_back();
- try {
- C2Payload && response =
protocol_.load()->consumePayload(payload);
- enqueue_c2_server_response(std::move(response));
- }
- catch(const std::exception &e) {
- logger_->log_error("Exception occurred while consuming payload.
error: %s", e.what());
- }
- catch(...) {
- logger_->log_error("Unknonwn exception occurred while consuming
payload.");
- }
- }while(!requests.empty() && ++count < max_c2_responses);
+ if (protocol_.load() != nullptr) {
+ std::vector<C2Payload> payload_batch;
+ payload_batch.reserve(max_c2_responses);
+ auto getRequestPayload = [&payload_batch] (C2Payload&& payload) {
payload_batch.emplace_back(std::move(payload)); };
+ const std::chrono::system_clock::time_point timeout_point =
std::chrono::system_clock::now() + std::chrono::milliseconds(1);
+ for (std::size_t attempt_num = 0; attempt_num < max_c2_responses;
++attempt_num) {
+ if (!requests.consumeWaitUntil(getRequestPayload, timeout_point)) {
+ break;
}
}
- try {
- performHeartBeat();
- }
- catch(const std::exception &e) {
- logger_->log_error("Exception occurred while performing heartbeat.
error: %s", e.what());
- }
- catch(...) {
- logger_->log_error("Unknonwn exception occurred while performing
heartbeat.");
- }
+ std::for_each(
+ std::make_move_iterator(payload_batch.begin()),
+ std::make_move_iterator(payload_batch.end()),
+ [&] (C2Payload&& payload) {
+ try {
+ C2Payload && response =
protocol_.load()->consumePayload(std::move(payload));
+ enqueue_c2_server_response(std::move(response));
+ }
+ catch(const std::exception &e) {
+ logger_->log_error("Exception occurred while consuming payload.
error: %s", e.what());
+ }
+ catch(...) {
+ logger_->log_error("Unknonwn exception occurred while consuming
payload.");
+ }
+ });
- checkTriggers();
+ try {
+ performHeartBeat();
+ }
+ catch (const std::exception &e) {
+ logger_->log_error("Exception occurred while performing heartbeat.
error: %s", e.what());
+ }
+ catch (...) {
+ logger_->log_error("Unknonwn exception occurred while performing
heartbeat.");
+ }
+ }
+
+ checkTriggers();
+
+ return
utils::TaskRescheduleInfo::RetryIn(std::chrono::milliseconds(heart_beat_period_));
+ };
- return
utils::TaskRescheduleInfo::RetryIn(std::chrono::milliseconds(heart_beat_period_));
- };
functions_.push_back(c2_producer_);
- c2_consumer_ = [&]() {
- if ( queue_mutex.try_lock_for(std::chrono::seconds(1)) ) {
- C2Payload payload(Operation::HEARTBEAT);
- {
- std::lock_guard<std::timed_mutex> lock(queue_mutex, std::adopt_lock);
- if (responses.empty()) {
- return
utils::TaskRescheduleInfo::RetryIn(std::chrono::milliseconds(C2RESPONSE_POLL_MS));
- }
- payload = std::move(responses.back());
- responses.pop_back();
+ c2_consumer_ = [&] {
+ if (responses.size()) {
+ if (!responses.consumeWaitFor([this](C2Payload&& e) {
extractPayload(std::move(e)); }, std::chrono::seconds(1))) {
Review comment:
1. My preference is `!empty()`, because it reads as "not empty", which
is the intention here. On the other hand I'm ok with using `size() > 0`, as
that's only one logical step away from the intention, but not plain `size()`
because that implicit int -> bool conversion is surprising to the reader, like
every implicit conversion that converts to something that's not logically "the
same thing". I think the readers mind goes like this:
1. if the size of responses. wtf, that doesn't make sense
2. Ah, implicit int -> bool conversion, so "if the size of the responses
is not zero".
3. That's "if the responses are not empty", i.e. "if there are responses"
Sorry for the long comment, I hope this makes sense.
2. Sorry for the accusation, you're right about the second point. I must
have been salty because of something when writing this. :(
However, this raises another problem, which is that I, as the reader,
misunderstood the code, so it's probably too complex. I suggest extracting the
lambda and maybe even the consume call, so that the identifiers can guide the
reader.
3. \-
```suggestion
if (responses.size() > 0) { // or (!responses.empty()), or (not
responses.empty())
const auto on_dequeue = [this](C2Payload&& payload) {
extractPayload(std::move(payload)); };
const auto dequeue_success = responses.consumeWaitFor(on_dequeue,
std::chrono::seconds{1});
if (!dequeue_success) {
```
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