C++ WebSocket client for Flipper

Summary:
Introducing a Flipper WebSocket client implemented in C++.
The requirement came from Spark AR (Skylight) as they have a macOS/Linux/Windows clients.

For reviewers:

- This is an implementation of the existing FlipperSocket interface. Effectively, the only type that needs to be reviewed is WebSocketTLSClient.

- BaseClient defined a base class for WebSocketClient and WebSocketTLSClient.

- WebSocketClient is a simplified version of WebSocketTLSClient as there's no TLS configuration.

Reviewed By: mweststrate

Differential Revision: D34081943

fbshipit-source-id: 619a83f5a6783a21069d0f5111d139bb180f9e97

xplat/FlipperWebSocket/FlipperWebSocket.h

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#ifdef FB_SONARKIT_ENABLED
+
+#pragma once
+
+#include <Flipper/FlipperSocket.h>
+#include <Flipper/FlipperSocketProvider.h>
+#include <Flipper/FlipperTransportTypes.h>
+#include <folly/dynamic.h>
+#include <folly/io/async/EventBase.h>
+#include <future>
+#include <memory>
+#include <mutex>
+#include "BaseClient.h"
+
+namespace facebook {
+namespace flipper {
+
+class FlipperConnectionManager;
+class ConnectionContextStore;
+class FlipperWebSocket : public FlipperSocket {
+ public:
+  FlipperWebSocket(
+      FlipperConnectionEndpoint endpoint,
+      std::unique_ptr<FlipperSocketBasePayload> payload,
+      folly::EventBase* eventBase);
+  FlipperWebSocket(
+      FlipperConnectionEndpoint endpoint,
+      std::unique_ptr<FlipperSocketBasePayload> payload,
+      folly::EventBase* eventBase,
+      ConnectionContextStore* connectionContextStore);
+
+  virtual ~FlipperWebSocket();
+
+  virtual void setEventHandler(SocketEventHandler eventHandler) override;
+  virtual void setMessageHandler(SocketMessageHandler messageHandler) override;
+
+  virtual bool connect(FlipperConnectionManager* manager) override;
+  virtual void disconnect() override;
+
+  virtual void send(const folly::dynamic& message, SocketSendHandler completion)
+      override;
+  virtual void send(const std::string& message, SocketSendHandler completion)
+      override;
+  virtual void sendExpectResponse(
+      const std::string& message,
+      SocketSendExpectResponseHandler completion) override;
+
+ private:
+  std::unique_ptr<BaseClient> socket_;
+};
+
+class FlipperWebSocketProvider : public FlipperSocketProvider {
+ public:
+  FlipperWebSocketProvider() {}
+  virtual std::unique_ptr<FlipperSocket> create(
+      FlipperConnectionEndpoint endpoint,
+      std::unique_ptr<FlipperSocketBasePayload> payload,
+      folly::EventBase* eventBase) override {
+    return std::make_unique<FlipperWebSocket>(
+        std::move(endpoint), std::move(payload), eventBase);
+  }
+  virtual std::unique_ptr<FlipperSocket> create(
+      FlipperConnectionEndpoint endpoint,
+      std::unique_ptr<FlipperSocketBasePayload> payload,
+      folly::EventBase* eventBase,
+      ConnectionContextStore* connectionContextStore) override {
+    return std::make_unique<FlipperWebSocket>(
+        std::move(endpoint),
+        std::move(payload),
+        eventBase,
+        connectionContextStore);
+  }
+};
+
+} // namespace flipper
+} // namespace facebook
+
+#endif