} /* unmarshal_value_list() */
/*
- * request call-backs and call objects
- */
-static grpc::Status DispatchValue(grpc::ServerContext *ctx, DispatchValuesRequest request, DispatchValuesResponse *reply)
-{
- value_list_t vl = VALUE_LIST_INIT;
- auto status = unmarshal_value_list(request.value_list(), &vl);
- if (!status.ok())
- return status;
-
- if (plugin_dispatch_values(&vl))
- status = grpc::Status(grpc::StatusCode::INTERNAL,
- grpc::string("failed to enqueue values for writing"));
-
- reply->Clear();
- return status;
-} /* grpc::Status DispatchValue */
-
-// CallData is the abstract base class for asynchronous calls.
-class CallData {
-public:
- virtual ~CallData() {}
- virtual void process(bool ok) = 0;
-
-protected:
- CallData() {}
-
-private:
- CallData(const CallData&) = delete;
- CallData& operator=(const CallData&) = delete;
-};
-
-/*
* Collectd service
*/
-
-// QueryValuesCallData holds the state and implements the logic for QueryValues calls.
-class QueryValuesCallData : public CallData {
+class CollectdImpl : public collectd::Collectd::Service {
public:
- QueryValuesCallData(Collectd::AsyncService* service, grpc::ServerCompletionQueue* cq)
- : cq_(cq), service_(service), writer_(&context_) {
- process(true);
- }
+ grpc::Status QueryValues(grpc::ServerContext *ctx, QueryValuesRequest const *req, grpc::ServerWriter<QueryValuesResponse> *writer) override {
+ value_list_t match;
+ auto err = unmarshal_ident(req->identifier(), &match, false);
+ if (!err.ok()) {
+ return err;
+ }
- void process(bool ok) final {
- if (status_ == Status::INIT) {
- status_ = Status::READ;
- service_->RequestQueryValues(&context_, &request_, &writer_, cq_, cq_, this);
- } else if (status_ == Status::READ) {
- auto err = queryValues();
- if (!err.ok()) {
- writer_.Finish(err, this);
- status_ = Status::DONE;
- return;
- }
- respond();
- } else if (status_ == Status::WRITE) {
- respond();
- } else if (status_ == Status::DONE) {
- new QueryValuesCallData(service_, cq_);
- delete this;
- } else {
- throw std::logic_error("Unhandled state enum.");
+ std::queue<value_list_t> value_lists;
+ err = this->read(&match, &value_lists);
+ if (err.ok()) {
+ err = this->write(ctx, writer, &value_lists);
+ }
+
+ while (!value_lists.empty()) {
+ auto vl = value_lists.front();
+ value_lists.pop();
+ sfree(vl.values);
}
+
+ return err;
}
private:
- enum class Status {
- INIT,
- READ,
- WRITE,
- DONE,
- };
-
- grpc::Status queryValues (void) {
+ grpc::Status read(value_list_t const *match, std::queue<value_list_t> *value_lists) {
uc_iter_t *iter;
- char *name = NULL;
-
- value_list_t matcher;
- auto status = unmarshal_ident(request_.identifier(), &matcher, false);
- if (!status.ok())
- return status;
-
if ((iter = uc_get_iterator()) == NULL) {
return grpc::Status(grpc::StatusCode::INTERNAL,
grpc::string("failed to query values: cannot create iterator"));
}
- status = grpc::Status::OK;
+ grpc::Status status = grpc::Status::OK;
+ char *name = NULL;
while (uc_iterator_next(iter, &name) == 0) {
value_list_t vl;
if (parse_identifier_vl(name, &vl) != 0) {
break;
}
- if (!ident_matches(&vl, &matcher))
+ if (!ident_matches(&vl, match))
continue;
if (uc_iterator_get_time(iter, &vl.time) < 0) {
break;
}
- value_lists_.push(vl);
- }
+ value_lists->push(vl);
+ } // while (uc_iterator_next(iter, &name) == 0)
uc_iterator_destroy(iter);
return status;
}
- void respond() {
- if (value_lists_.empty()) {
- writer_.Finish(grpc::Status::OK, this);
- status_ = Status::DONE;
- return;
- }
+ grpc::Status write(grpc::ServerContext *ctx,
+ grpc::ServerWriter<QueryValuesResponse> *writer,
+ std::queue<value_list_t> *value_lists) {
+ while (!value_lists->empty()) {
+ auto vl = value_lists->front();
+ QueryValuesResponse res;
+ res.Clear();
+
+ auto err = marshal_value_list(&vl, res.mutable_value_list());
+ if (!err.ok()) {
+ return err;
+ }
- auto vl = value_lists_.front();
+ if (!writer->Write(res)) {
+ return grpc::Status::CANCELLED;
+ }
- response_.Clear();
- auto err = marshal_value_list(&vl, response_.mutable_value_list());
- if (!err.ok()) {
- writer_.Finish(err, this);
- status_ = Status::DONE;
- return;
+ value_lists->pop();
+ sfree(vl.values);
}
- value_lists_.pop();
- free(vl.values);
-
- writer_.Write(response_, this);
- status_ = Status::WRITE;
+ return grpc::Status::OK;
}
-
- Status status_ = Status::INIT;
- grpc::ServerContext context_;
- grpc::ServerCompletionQueue* cq_;
- Collectd::AsyncService* service_;
- QueryValuesRequest request_;
- std::queue<value_list_t> value_lists_;
- QueryValuesResponse response_;
- grpc::ServerAsyncWriter<QueryValuesResponse> writer_;
};
/*
* Dispatch service
*/
-// DispatchValuesCallData holds the state and implements the logic for DispatchValues calls.
-class DispatchValuesCallData : public CallData {
+class DispatchImpl : public collectd::Dispatch::Service {
public:
- DispatchValuesCallData(Dispatch::AsyncService* service, grpc::ServerCompletionQueue* cq)
- : cq_(cq), service_(service), reader_(&context_) {
- process(true);
- }
-
- void process(bool ok) final {
- if (status == Status::INIT) {
- service_->RequestDispatchValues(&context_, &reader_, cq_, cq_, this);
- status = Status::CALL;
- } else if (status == Status::CALL) {
- reader_.Read(&request_, this);
- status = Status::READ;
- } else if (status == Status::READ && ok) {
- (void) DispatchValue(&context_, request_, &response_);
-
- reader_.Read(&request_, this);
- } else if (status == Status::READ) {
- response_.Clear();
-
- status = Status::DONE;
- } else if (status == Status::DONE) {
- new DispatchValuesCallData(service_, cq_);
- delete this;
- } else {
- ERROR("grpc: DispatchValuesCallData: invalid state");
+ grpc::Status DispatchValues(grpc::ServerContext *ctx,
+ grpc::ServerReader<DispatchValuesRequest> *reader,
+ DispatchValuesResponse *res) override {
+ DispatchValuesRequest req;
+
+ while (reader->Read(&req)) {
+ value_list_t vl = VALUE_LIST_INIT;
+ auto status = unmarshal_value_list(req.value_list(), &vl);
+ if (!status.ok())
+ return status;
+
+ if (plugin_dispatch_values(&vl))
+ return grpc::Status(grpc::StatusCode::INTERNAL,
+ grpc::string("failed to enqueue values for writing"));
}
- }
-private:
- enum class Status {
- INIT,
- CALL,
- READ,
- DONE,
- };
- Status status = Status::INIT;
-
- grpc::ServerContext context_;
- grpc::ServerCompletionQueue* cq_;
- Dispatch::AsyncService* service_;
-
- DispatchValuesRequest request_;
- DispatchValuesResponse response_;
- grpc::ServerAsyncReader<DispatchValuesResponse, DispatchValuesRequest> reader_;
+ res->Clear();
+ return grpc::Status::OK;
+ }
};
/*
}
}
- cq_ = builder.AddCompletionQueue();
-
builder.RegisterService(&collectd_service_);
builder.RegisterService(&dispatch_service_);
server_ = builder.BuildAndStart();
- new QueryValuesCallData(&collectd_service_, cq_.get());
- new DispatchValuesCallData(&dispatch_service_, cq_.get());
} /* Start() */
void Shutdown()
{
server_->Shutdown();
- cq_->Shutdown();
} /* Shutdown() */
- void Mainloop()
- {
- while (true) {
- void *tag = NULL;
- bool ok = false;
-
- // Block waiting to read the next event from the completion queue.
- // The event is uniquely identified by its tag, which in this case
- // is the memory address of a CallData instance.
- if (!cq_->Next(&tag, &ok))
- break; // Queue shut down.
-
- static_cast<CallData*>(tag)->process(ok);
- }
- } /* Mainloop() */
-
private:
- Collectd::AsyncService collectd_service_;
- Dispatch::AsyncService dispatch_service_;
+ CollectdImpl collectd_service_;
+ DispatchImpl dispatch_service_;
std::unique_ptr<grpc::Server> server_;
- std::unique_ptr<grpc::ServerCompletionQueue> cq_;
}; /* class CollectdServer */
static CollectdServer *server = nullptr;
* collectd plugin interface
*/
extern "C" {
- static pthread_t *workers;
- static size_t workers_num = 5;
-
- static void *worker_thread(void *arg)
- {
- CollectdServer *s = (CollectdServer *)arg;
- s->Mainloop();
- return NULL;
- } /* worker_thread() */
-
static int c_grpc_config_listen(oconfig_item_t *ci)
{
if ((ci->values_num != 2)
if (c_grpc_config_listen(child))
return -1;
}
- else if (!strcasecmp("WorkerThreads", child->key)) {
- int n;
- if (cf_util_get_int(child, &n))
- return -1;
- workers_num = (size_t)n;
- }
else {
WARNING("grpc: Option `%s` not allowed here.", child->key);
}
static int c_grpc_init(void)
{
server = new CollectdServer();
- size_t i;
-
- if (! server) {
+ if (!server) {
ERROR("grpc: Failed to create server");
return -1;
}
- workers = (pthread_t *)calloc(workers_num, sizeof(*workers));
- if (! workers) {
- delete server;
- server = nullptr;
-
- ERROR("grpc: Failed to allocate worker threads");
- return -1;
- }
-
server->Start();
- for (i = 0; i < workers_num; i++) {
- plugin_thread_create(&workers[i], /* attr = */ NULL,
- worker_thread, server);
- }
- INFO("grpc: Started %zu workers", workers_num);
return 0;
} /* c_grpc_init() */
static int c_grpc_shutdown(void)
{
- size_t i;
-
if (!server)
- return -1;
+ return 0;
server->Shutdown();
- INFO("grpc: Waiting for %zu workers to terminate", workers_num);
- for (i = 0; i < workers_num; i++)
- pthread_join(workers[i], NULL);
- free(workers);
- workers = NULL;
- workers_num = 0;
-
delete server;
server = nullptr;
projects / collectd.git / commitdiff