wpiutil: Add WebSocket implementation (#1186)

This is a RFC 6455 compliant implementation with both client and server support.

wpiutil/src/test/native/cpp/WebSocketTest.h

@@ -0,0 +1,73 @@
+/*----------------------------------------------------------------------------*/
+/* Copyright (c) 2018 FIRST. 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.                                                               */
+/*----------------------------------------------------------------------------*/
+
+#pragma once
+
+#include <cstdio>
+#include <memory>
+#include <vector>
+
+#include "gtest/gtest.h"
+#include "wpi/ArrayRef.h"
+#include "wpi/uv/Loop.h"
+#include "wpi/uv/Pipe.h"
+#include "wpi/uv/Timer.h"
+
+namespace wpi {
+
+class WebSocketTest : public ::testing::Test {
+ public:
+  static const char* pipeName;
+
+  static void SetUpTestCase();
+
+  WebSocketTest() {
+    loop = uv::Loop::Create();
+    clientPipe = uv::Pipe::Create(loop);
+    serverPipe = uv::Pipe::Create(loop);
+
+    serverPipe->Bind(pipeName);
+
+#if 0
+    auto debugTimer = uv::Timer::Create(loop);
+    debugTimer->timeout.connect([this] {
+      std::printf("Active handles:\n");
+      uv_print_active_handles(loop->GetRaw(), stdout);
+    });
+    debugTimer->Start(uv::Timer::Time{100}, uv::Timer::Time{100});
+    debugTimer->Unreference();
+#endif
+
+    auto failTimer = uv::Timer::Create(loop);
+    failTimer->timeout.connect([this] {
+      loop->Stop();
+      FAIL() << "loop failed to terminate";
+    });
+    failTimer->Start(uv::Timer::Time{1000});
+    failTimer->Unreference();
+  }
+
+  ~WebSocketTest() { Finish(); }
+
+  void Finish() {
+    loop->Walk([](uv::Handle& it) { it.Close(); });
+  }
+
+  static std::vector<uint8_t> BuildHeader(uint8_t opcode, bool fin,
+                                          bool masking, uint64_t len);
+  static std::vector<uint8_t> BuildMessage(uint8_t opcode, bool fin,
+                                           bool masking,
+                                           ArrayRef<uint8_t> data);
+  static void AdjustMasking(MutableArrayRef<uint8_t> message);
+  static const uint8_t testMask[4];
+
+  std::shared_ptr<uv::Loop> loop;
+  std::shared_ptr<uv::Pipe> clientPipe;
+  std::shared_ptr<uv::Pipe> serverPipe;
+};
+
+}  // namespace wpi