<add>增加nats连接对象

.gitignore

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+/build

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16)
+project(NatsConnect)
+set(CMAKE_CXX_STANDARD 11)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+
+add_executable(${PROJECT_NAME} test.cpp)
+target_link_directories(${PROJECT_NAME} PUBLIC lib)
+target_link_libraries(${PROJECT_NAME} PRIVATE nats)
+target_include_directories(${PROJECT_NAME} PUBLIC include)

include/NatsConnect.hpp

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+#pragma once
+
+#include <nats/nats.h>
+
+#include <iostream>
+
+typedef void(*cb)(const char*, size_t);
+class NatsConnect {
+    natsConnection* m_con = nullptr;
+    cb m_cb;
+public:
+
+    NatsConnect() = default;
+    explicit NatsConnect(const char* url) { connect(url); }
+    ~NatsConnect();
+
+    void connect(const char* url) noexcept;
+    void disconnect() noexcept;
+    void reconnect() noexcept;
+    void publish(const char* subject, const char* data) noexcept;
+    operator void*() const { return m_con; }
+
+    void subscribe(const char* subject, cb f) noexcept;
+    static void handle(const char* msg, size_t len, NatsConnect* obj);
+};
+
+
+inline NatsConnect::~NatsConnect() {
+    if (m_con) {
+        natsConnection_Close(m_con);
+        natsConnection_Destroy(m_con);
+    }
+}
+
+inline void NatsConnect::connect(const char* url) noexcept {
+    nats_CheckCompatibility();
+    const natsStatus s = natsConnection_ConnectTo(&m_con, url);
+    if (s != NATS_OK) {
+        printf("Error: %s\n", natsStatus_GetText(s));
+        return;
+    }
+}
+
+inline void NatsConnect::subscribe(const char *subject, cb f) noexcept {
+    m_cb = f;
+    natsSubscription *sub = nullptr;
+    const natsStatus s = natsConnection_Subscribe(&sub, m_con, subject, [](natsConnection *nc, natsSubscription *sub, natsMsg *msg, void *closure) {
+        handle(natsMsg_GetData(msg), natsMsg_GetDataLength(msg), (NatsConnect*)closure);
+    }, this);
+    if (s != NATS_OK) {
+        printf("Error: %s\n", natsStatus_GetText(s));
+        return;
+    }
+    natsSubscription_SetPendingLimits(sub, 1024, 1024);
+}
+
+inline void NatsConnect::handle(const char *msg, size_t len, NatsConnect *obj) {
+    obj->m_cb(msg, len);
+}