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lb_cplane_async.cc
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lb_cplane_async.cc
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//
// Copyright 2023, Jefferson Science Associates, LLC.
// Subject to the terms in the LICENSE file found in the top-level directory.
//
// EPSCI Group
// Thomas Jefferson National Accelerator Facility
// 12000, Jefferson Ave, Newport News, VA 23606
// (757)-269-7100
#include "lb_cplane_async.h"
static std::atomic<std::uint64_t> backendToken{0};
using namespace std::chrono;
//////////////////
// BackEnd class
/////////////////
/**
* Constructor.
* @param req registration request from backend.
*/
BackEnd::BackEnd(const RegisterRequest* req) {
authToken = req->authtoken();
name = req->name();
cpus = req->cpus();
ramBytes = req->rambytes();
bufCount = req->bufcount();
bufSizeBytes = req->bufsizebytes();
setPointPercent = req->setpointpercent();
targetIP = req->dplanetargetip();
targetPort = req->dplanetargetport();
targetPortRange = req->dplanetargetportrange();
}
/**
* Update values.
* @state current state used to update this object.
*/
void BackEnd::update(const SendStateRequest* state) {
if (state->has_timestamp()) {
time = google::protobuf::util::TimeUtil::TimestampToMilliseconds(state->timestamp());
timestamp = state->timestamp();
}
// Now record local time
localTime = duration_cast<milliseconds>(system_clock::now().time_since_epoch()).count();
sessionToken = state->sessiontoken();
fillPercent = state->fillpercent();
pidError = state->piderror();
isReady = state->isready();
}
/** Print out backend status. */
void BackEnd::printBackendState() const {
std::cout << "State of " << name
<< " @ t = " << time
<< " : buf cnt = " << bufCount
<< ", buf size = " << bufSizeBytes
<< ", set pt = " << setPointPercent
<< ", fill % = " << fillPercent
<< ", pid error % = " << pidError
<< ", ready = " << isReady
<< std::endl;
}
/** Get the backend's authentication token.
* @return backend's authentication token. */
const std::string & BackEnd::getAuthToken() const {return authToken;}
/** Get the backend's session token.
* @return backend's session token. */
const std::string & BackEnd::getSessionToken() const {return sessionToken;}
/** Get the backend's name.
* @return backend's name. */
const std::string & BackEnd::getName() const {return name;}
/** Get the timestamp of the latest backend's sent data.
* @return timestamp of the latest backend's sent data. */
google::protobuf::Timestamp BackEnd::getTimestamp() const {return timestamp;}
/** Get the timestamp of the latest backend's sent data.
* @return timestamp of the latest backend's sent data. */
int64_t BackEnd::getTime() const {return time;}
/** Get the locally set timestamp of the arrival of the latest backend's sent data.
* @return locally set timestamp of the arrival of the latest backend's sent data. */
int64_t BackEnd::getLocalTime() const {return localTime;}
/** Get total number of cores on backend.
* @return backend's number of cores. */
uint32_t BackEnd::getCpus() const {return cpus;}
/** Get total RAM in backend.
* @return backend's total RAM. */
uint32_t BackEnd::getRamBytes() const {return ramBytes;}
/** Get the backend's total number of fifo entries (buffers).
* @return backend's total number of fifo entries. */
uint32_t BackEnd::getBufCount() const {return bufCount;}
/** Get the byte size of each backend fifo entry (buffer).
* @return byte size of each backend fifo entry. */
uint32_t BackEnd::getBufSizeBytes() const {return bufSizeBytes;}
/** Get the fill percentage of the backend fifo (0-1).
* @return fill percentage of the backend fifo. */
float BackEnd::getFillPercent() const {return fillPercent;}
/** Get the set point of the backend in % fifo filled (0-1).
* @return set point of the backend. */
float BackEnd::getSetPointPercent() const {return setPointPercent;}
/** Get the PID loop's error term in % fifo (0 - +/- 0.5).
* @return PID loop's error term. */
float BackEnd::getPidError() const {return pidError;}
/** Get the backend's receiving IP address (dot-decimal).
* @return backend's receiving IP address. */
const std::string & BackEnd::getTargetIP() const {return targetIP;}
/** Get the backend's receiving UDP port.
* @return backend's receiving UDP port. */
uint32_t BackEnd::getTargetPort() const {return targetPort;}
/** Get the backend's receiving UDP port.
* @return backend's receiving UDP port. */
uint32_t BackEnd::getTargetPortRange() const {return targetPortRange;}
/** Get if backend's ready to receive more data.
* @return true if backend's ready to receive more data. */
bool BackEnd::getIsReady() const {return isReady;}
/** True if backend is actively sending data updates.
* @return true if backend is actively sending data updates. */
bool BackEnd::getIsActive() const {return isActive;}
/** True if backend is actively sending data updates.
* @param active true if backend is actively sending data updates, else false. */
void BackEnd::setIsActive(bool active) {isActive = active;}
/////////////////////////////////
// BackEndReportService class
/////////////////////////////////
Status BackendReportServiceImpl::SendStateAsync(ServerContext* context,
const SendStateRequest* state,
ServerAsyncResponseWriter<SendStateReply> *responder,
CompletionQueue *cq1, CompletionQueue *cq2,
void *ptr) {
return Status::OK;
}
/**
* Send the state of the backend to server / control-plane.
* @param contex unused here
* @param request unused here
* @param reply reply to send to client
*/
Status BackendReportServiceImpl::SendState (ServerContext* context,
const SendStateRequest* state,
SendStateReply* reply) {
// Protect map since there's multithreaded access
const std::lock_guard<std::mutex> lock(map_mutex);
// Search on the token
auto backend = data.find(state->sessiontoken());
// If not registered
if (backend == data.end()) {
std::cout << "Receives state of UNREGISTERED session token " << state->sessiontoken() << ", ignore" << std::endl;
return Status::OK;
}
//std::cout << "Received state of session token " << state->sessiontoken() << std::endl;
backend->second.update(state);
return Status::OK;
}
/**
* Register a backend with the control plane.
* @param contex unused here
* @param request unused here
* @param reply reply to send to client
*/
Status BackendReportServiceImpl::Register (ServerContext* context,
const RegisterRequest* request,
RegisterReply* reply) {
const std::lock_guard<std::mutex> lock(map_mutex);
std::cout << "Currently NO authentication needed for " << request->name() << std::endl;
// Generate a unique session token
uint64_t val = backendToken.fetch_add(1, std::memory_order_relaxed);
std::string sessionToken = std::to_string(val);
// Save backend info and place in a map
BackEnd be(request);
data.insert(std::make_pair(sessionToken, be));
std::cout << "Registered client\"" << request->name() << "\" (as token " << val << ")" << std::endl;
reply->set_sessiontoken(sessionToken);
return Status::OK;
}
/**
* Unregister a backend from the control plane.
* @param contex unused here
* @param request unused here
* @param reply reply to send to client
*/
Status BackendReportServiceImpl::DeRegister (ServerContext* context,
const DeregisterRequest* request,
DeregisterReply* reply) {
const std::lock_guard<std::mutex> lock(map_mutex);
data.erase(request->sessiontoken());
std::cout << "De-registered client token " << request->sessiontoken() << std::endl;
return Status::OK;
}
/**
* Get a COPY of the map containing all BackEnd objects.
* Copying the map while mutex protected and then using it will keep things threadsafe.
* This method will need to be called each time updated data is needed.
* @return COPY of map containing all BackEnd objects.
*/
std::shared_ptr<std::unordered_map<std::string, BackEnd>> BackendReportServiceImpl::getBackEnds() {
const std::lock_guard<std::mutex> lock(map_mutex);
return std::make_shared<std::unordered_map<std::string, BackEnd>>(data);
}
//helloworld::Greeter::AsyncService service;
//ServerBuilder builder;
//builder.AddListeningPort("0.0.0.0:50051", InsecureServerCredentials());
//builder.RegisterService(&service);
//auto cq = builder.AddCompletionQueue();
//auto server = builder.BuildAndStart();
/**
* Blocking call to run local server.
* @param port port to run server on.
*/
void BackendReportServiceImpl::runServer(uint16_t port, BackendReportServiceImpl *service) {
std::cout << "in runServer method on port " << port << std::endl;
std::string server_address("0.0.0.0:" + std::to_string(port));
//std::string server_address2("0.0.0.0:50051");
//BackendStateServiceImpl service;
std::cout << "Server listening on " << server_address << std::endl;
grpc::EnableDefaultHealthCheckService(true);
grpc::reflection::InitProtoReflectionServerBuilderPlugin();
ServerBuilder builder;
// Listen on the given address without any authentication mechanism.
builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
// Register "service" as the instance through which we'll communicate with
// clients. In this case it corresponds to an *synchronous* service.
builder.RegisterService(service);
cq = builder.AddCompletionQueue();
// Finally assemble the server.
std::unique_ptr<Server> server(builder.BuildAndStart());
std::cout << "Server listening on " << server_address << std::endl;
// Wait for the server to shutdown. Note that some other thread must be
// responsible for shutting down the server for this call to ever return.
server->Wait();
}
/////////////////////////////////
// LbControlPlaneClient class
/////////////////////////////////
/**
* Constructor.
* @param cpIpAddr grpc IP address of control plane (dotted decimal format).
* @param cpPort grpc port of control plane.
* @param cliName name of this backend.
* @param bufferSize byte size of each buffer (fifo entry) in this backend.
* @param bufferCount number of buffers in fifo.
* @param setPoint PID loop set point (% of fifo).
*
*/
LbControlPlaneClient::LbControlPlaneClient(
const std::string& cpIP, uint16_t cpPort, const std::string& cliName,
uint32_t bufferSize, uint32_t bufferCount, float setPoint) :
ipAddr(cpIP), port(cpPort), name(cliName),
bufSizeBytes(bufferSize), bufCount(bufferCount), setPointPercent(setPoint) {
target = cpIP + ":" + std::to_string(cpPort);
stub_ = BackendReport::NewStub(grpc::CreateChannel(target, grpc::InsecureChannelCredentials()));
}
/**
* Update internal state of this object (eventually sent to control plane).
* @param fill % of fifo filled
* @param pdErr pid error (units of % fifo filled)
*/
void LbControlPlaneClient::update(float fill, float pidErr) {
fillPercent = fill;
pidError = pidErr;
}
/**
* Register this backend with the control plane.
* @return 0 if successful, 1 if error in grpc communication
*/
int32_t LbControlPlaneClient::Register() {
// Registration message we are sending to server
RegisterRequest request;
request.set_authtoken(name);
request.set_name(name);
// Get # of cores (0 if unknown) (since C++ 11)
unsigned int nthreads = std::thread::hardware_concurrency();
request.set_cpus(nthreads);
// Find the amount of RAM
long page_size = sysconf(_SC_PAGE_SIZE);
long pages = 0;
uint64_t mem;
#ifdef __linux__
// NOT POSIX
pages = sysconf(_SC_PHYS_PAGES);
#elif __APPLE__
size_t len = sizeof(mem);
sysctlbyname("hw.memsize", &mem, &len, NULL, 0);
#endif
mem = pages * page_size;
request.set_rambytes(mem);
request.set_bufsizebytes(bufSizeBytes);
request.set_bufcount(bufCount);
request.set_setpointpercent(setPointPercent);
// Container for the response we expect from server
RegisterReply reply;
// Context for the client. It could be used to convey extra information to
// the server and/or tweak certain RPC behaviors.
ClientContext context;
// The actual RPC
Status status = stub_->Register(&context, request, &reply);
// Act upon its status
if (!status.ok()) {
std::cout << status.error_code() << ": " << status.error_message() << std::endl;
return 1;
}
sessionToken = reply.sessiontoken();
return 0;
}
/**
* Unregister this backend with the control plane.
* @return 0 if successful, 1 if error in grpc communication
*/
int LbControlPlaneClient::Deregister() const {
// Deregistration message we are sending to server
DeregisterRequest request;
request.set_sessiontoken(sessionToken);
// Container for the response we expect from server
DeregisterReply reply;
// Context for the client. It could be used to convey extra information to
// the server and/or tweak certain RPC behaviors.
ClientContext context;
// The actual RPC
Status status = stub_->Deregister(&context, request, &reply);
// Act upon its status
if (!status.ok()) {
std::cout << status.error_code() << ": " << status.error_message() << std::endl;
return 1;
}
return 0;
}
/**
* Send the state of this backend to the control plane.
* @return 0 if successful, 1 if error in grpc communication
*/
int LbControlPlaneClient::SendState() const {
// Data we are sending to the server.
SendStateRequest request;
request.set_sessiontoken(sessionToken);
// Set the time
struct timespec t1;
clock_gettime(CLOCK_REALTIME, &t1);
auto timestamp = new google::protobuf::Timestamp{};
timestamp->set_seconds(t1.tv_sec);
timestamp->set_nanos(t1.tv_nsec);
// Give ownership of object to protobuf
request.set_allocated_timestamp(timestamp);
request.set_fillpercent(fillPercent);
request.set_piderror(pidError);
request.set_isready(true);
// Container for the data we expect from the server.
SendStateReply reply;
// Context for the client. It could be used to convey extra information to
// the server and/or tweak certain RPC behaviors.
ClientContext context;
// The actual RPC.
Status status = stub_->SendState(&context, request, &reply);
// Act upon its status.
if (!status.ok()) {
std::cout << status.error_code() << ": " << status.error_message() << std::endl;
return 1;
}
return 0;
}
// Getters
const std::string & LbControlPlaneClient::getIP() const {return ipAddr;}
const std::string & LbControlPlaneClient::getName() const {return name;}
uint16_t LbControlPlaneClient::getPort() const {return port;}
uint32_t LbControlPlaneClient::getBufCount() const {return bufCount;}
uint32_t LbControlPlaneClient::getBufSizeBytes() const {return bufSizeBytes;}
float LbControlPlaneClient::getSetPointPercent() const {return setPointPercent;}
float LbControlPlaneClient::getFillPercent() const {return fillPercent;}
float LbControlPlaneClient::getPidError() const {return pidError;}