abstract common tcp operations to a base class

common/TcpBase.hpp

@@ -0,0 +1,44 @@
+
+#pragma once
+
+#include "ErrorCodes.hpp"
+#include "LoggerService.hpp"
+
+// TcpBase contains common tcp I/O operations for the tcp client and tcp server
+// Abstracts away the networking methods into an accordion common protocol (ACP)
+class TcpBase {
+
+public:
+
+    TcpBase(LoggerService* logger);
+    ~TcpBase();
+
+    // read from a tcp socket, blocking
+    ssize_t tcpRead(int fd, void* buffer, size_t maxBytes);
+
+    // read from a tcp socket, blocking with timeout
+    ssize_t tcpTimedRead(int fd, void* buffer, size_t maxBytes, int timeoutPlaceholder);
+
+    // send over a tcp socket, blocking
+    ssize_t tcpSend(int fd, const void* buffer, size_t numBytes);
+
+    // send over a tcp socket, blocking with timeout
+    ssize_t tcpTimedSend(int fd, const void* buffer, size_t numBytes, int timeoutPlaceholder);
+
+protected:
+
+    LoggerService* logger_;
+
+private:
+
+    ssize_t receiveHeader(int fd, void* buffer, size_t maxBytes);
+    ssize_t receivePayload(int fd, void* buffer, size_t maxBytes);
+    ssize_t sendHeader(int fd, const void* buffer, size_t maxBytes);
+    ssize_t sendPayload(int fd, const void* buffer, size_t maxBytes);
+
+    ssize_t receiveFull(int fd, void* buffer, size_t maxBytes);
+    ssize_t sendFull(int fd, const void* buffer, size_t numBytes);
+
+    static constexpr size_t kHeaderSize = 8; // 4 bytes for length, 4 bytes for type
+
+};