Class: OPCUA::Client::cMethodNode

Inherits:
cNode
  • Object
show all
Defined in:
ext/opcua/client/client.c

Instance Method Summary collapse

Methods inherited from cNode

#id, #to_s, #unsubscribe

Instance Method Details

#call(*args) ⇒ Object

{{{



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# File 'ext/opcua/client/client.c', line 508

static VALUE node_call(int argc, VALUE* argv, VALUE self) { //{{{
  node_struct *ns;
  UA_StatusCode retval;

  VALUE splat;
  rb_scan_args(argc, argv, "*", &splat);

  Data_Get_Struct(self, node_struct, ns);

  UA_NodeId parent;
  if (!client_node_get_reference_by_type(ns->master->master, ns->id, UA_NODEID_NUMERIC(0,UA_NS0ID_HASCOMPONENT), &parent, true)) {
    if (!client_node_get_reference_by_type(ns->master->master, ns->id, UA_NODEID_NUMERIC(0,UA_NS0ID_HASORDEREDCOMPONENT), &parent, true)) {
      rb_raise(rb_eRuntimeError, "Cant find parent node, neither hascomponent nor hasorderedcomponent is there!");
    }
  }

  UA_NodeId ia;
  client_node_get_reference_by_name(ns->master->master, ns->id, UA_QUALIFIEDNAME(0,"InputArguments"), &ia, false);
  UA_Variant iaval;
  UA_Variant_init(&iaval);
  UA_Client_readValueAttribute(ns->master->master, ia, &iaval);

  UA_UInt32 proposal[RARRAY_LEN(splat)];
  for (int i=0; i < iaval.arrayLength; i++) {
    UA_ExtensionObject* eoarg= (UA_ExtensionObject *)(iaval.data);
    UA_Argument* arg = (UA_Argument *)(eoarg[i].content.decoded.data);

    if (arg->dataType.namespaceIndex == 0) {
		  proposal[i] = arg->dataType.identifier.numeric - 1; // what a dirty hack TODO, translate node to value
    }
  }

  UA_Variant inputArguments[RARRAY_LEN(splat)];
  for (long i=0; i<RARRAY_LEN(splat); i++) {
    value_to_variant(RARRAY_AREF(splat, i),&inputArguments[i],proposal[i]);
  }

  size_t outputSize;
  UA_Variant *output;

  retval = UA_Client_call(
    ns->master->master,
    parent,
    ns->id,
    RARRAY_LEN(splat),
    (UA_Variant *)&inputArguments,
    &outputSize,
    &output
  );

  if (retval == UA_STATUSCODE_GOOD && outputSize > 0) {
    VALUE ret = rb_ary_new2(outputSize);
    for (int i=0; i<outputSize; i++) {
      rb_ary_store(ret,i,rb_ary_entry(extract_value(output[i]),0));
    }
    return rb_ary_entry(ret,0);
  } else {
    return Qnil;
  }
}