Prepare ntcore for merge into allwpilib.

ntcore/manualTests/native/rpc_local.cpp

@@ -0,0 +1,66 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) FIRST 2017-2018. All Rights Reserved.                        */
+/* Open Source Software - may be modified and shared by FRC teams. The code   */
+/* must be accompanied by the FIRST BSD license file in the root directory of */
+/* the project.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#include <chrono>
+#include <climits>
+#include <cstdio>
+#include <thread>
+
+#include <support/json.h>
+
+#include "ntcore.h"
+
+void callback1(const nt::RpcAnswer& answer) {
+  wpi::json params;
+  try {
+    params = wpi::json::from_cbor(answer.params);
+  } catch (wpi::json::parse_error err) {
+    std::fputs("could not decode params?\n", stderr);
+    return;
+  }
+  if (!params.is_number()) {
+    std::fputs("did not get number\n", stderr);
+    return;
+  }
+  double val = params.get<double>();
+  std::fprintf(stderr, "called with %g\n", val);
+
+  answer.PostResponse(wpi::json::to_cbor(val + 1.2));
+}
+
+int main() {
+  auto inst = nt::GetDefaultInstance();
+  nt::AddLogger(inst,
+                [](const nt::LogMessage& msg) {
+                  std::fputs(msg.message.c_str(), stderr);
+                  std::fputc('\n', stderr);
+                },
+                0, UINT_MAX);
+
+  nt::StartServer(inst, "rpc_local.ini", "", 10000);
+  auto entry = nt::GetEntry(inst, "func1");
+  nt::CreateRpc(entry, nt::StringRef("", 1), callback1);
+  std::fputs("calling rpc\n", stderr);
+  unsigned int call1_uid = nt::CallRpc(entry, wpi::json::to_cbor(2.0));
+  std::string call1_result_str;
+  std::fputs("waiting for rpc result\n", stderr);
+  nt::GetRpcResult(entry, call1_uid, &call1_result_str);
+  wpi::json call1_result;
+  try {
+    call1_result = wpi::json::from_cbor(call1_result_str);
+  } catch (wpi::json::parse_error err) {
+    std::fputs("could not decode result?\n", stderr);
+    return 1;
+  }
+  if (!call1_result.is_number()) {
+    std::fputs("result is not number?\n", stderr);
+    return 1;
+  }
+  std::fprintf(stderr, "got %g\n", call1_result.get<double>());
+
+  return 0;
+}