add getNativeCode to the qcs accelerator, move engagement to first time execute is called

Signed-off-by: Alex McCaskey <mccaskeyaj@ornl.gov>

quantum/plugins/rigetti/qcs/QCSAccelerator.cpp

@@ -92,6 +92,12 @@ result = str(np)
   return;
 }
 
+std::string QCSAccelerator::getNativeCode(std::shared_ptr<CompositeInstruction> program,
+                              const HeterogeneousMap &config) {
+  auto irt = xacc::getIRTransformation("qcs-quilc");
+  irt->apply(program, nullptr);
+  return program->toString();
+}
 void QCSAccelerator::execute(
     std::shared_ptr<AcceleratorBuffer> buffer,
     const std::vector<std::shared_ptr<CompositeInstruction>> functions) {
@@ -151,8 +157,6 @@ void QCSAccelerator::initialize(const HeterogeneousMap &params) {
 
   if (!guard && !Py_IsInitialized()) {
     guard = std::make_shared<py::scoped_interpreter>();
-    //       libpython_handle = dlopen("@PYTHON_LIB_NAME@", RTLD_LAZY |
-    //       RTLD_GLOBAL);
     initialized = true;
   }
 
@@ -184,6 +188,16 @@ void QCSAccelerator::_internal_init() {
     endpoint = backend;
   }
 
+}
+
+void QCSAccelerator::execute(
+    std::shared_ptr<AcceleratorBuffer> buffer,
+    const std::shared_ptr<CompositeInstruction> function) {
+
+  using json = nlohmann::json;
+
+  if (!engaged) {
+    // Do this one time if we want to execute
     std::string json_data = "{\"endpointId\": \"" + endpoint + "\"}";
     std::map<std::string, std::string> headers{
         {"Content-Type", "application/json"},
@@ -200,13 +214,9 @@ void QCSAccelerator::_internal_init() {
     qpu_endpoint = resp_json["address"];
     qpu_compiler_endpoint = qpu_compiler_url;
     user_id = resp_json["userId"].get<std::string>();
-}
-
-void QCSAccelerator::execute(
-    std::shared_ptr<AcceleratorBuffer> buffer,
-    const std::shared_ptr<CompositeInstruction> function) {
+    engaged = true;
+  }
 
-  using json = nlohmann::json;
 
   // Map IR to Native Quil string
   auto visitor = std::make_shared<QuilVisitor>(true);

quantum/plugins/rigetti/qcs/QCSAccelerator.hpp

@@ -108,6 +108,7 @@ protected:
   bool use_rpcq_auth_config = true;
 
   bool initialized = false;
+  bool engaged = false;
   std::shared_ptr<py::scoped_interpreter> guard;
 
   void _internal_init();
@@ -122,6 +123,9 @@ public:
                const std::vector<std::shared_ptr<CompositeInstruction>>
                    functions) override;
 
+  std::string getNativeCode(std::shared_ptr<CompositeInstruction> program,
+                              const HeterogeneousMap &config) override;
+    
   void initialize(const HeterogeneousMap &params = {}) override;
 
   void updateConfiguration(const HeterogeneousMap &config) override {