Add libhv and test http client

vendor/libhv/include/hv/hscope.h

@@ -0,0 +1,79 @@
+#ifndef HV_SCOPE_H_
+#define HV_SCOPE_H_
+
+#include <functional>
+typedef std::function<void()> Function;
+
+#include "hdef.h"
+
+// same as golang defer
+class Defer {
+public:
+    Defer(Function&& fn) : _fn(std::move(fn)) {}
+    ~Defer() { if(_fn) _fn();}
+private:
+    Function _fn;
+};
+#define defer(code) Defer STRINGCAT(_defer_, __LINE__)([&](){code});
+
+class ScopeCleanup {
+public:
+    template<typename Fn, typename... Args>
+    ScopeCleanup(Fn&& fn, Args&&... args) {
+        _cleanup = std::bind(std::forward<Fn>(fn), std::forward<Args>(args)...);
+    }
+
+    ~ScopeCleanup() {
+        _cleanup();
+    }
+
+private:
+    Function _cleanup;
+};
+
+template<typename T>
+class ScopeFree {
+public:
+    ScopeFree(T* p) : _p(p) {}
+    ~ScopeFree()    {SAFE_FREE(_p);}
+private:
+    T*  _p;
+};
+
+template<typename T>
+class ScopeDelete {
+public:
+    ScopeDelete(T* p) : _p(p) {}
+    ~ScopeDelete()    {SAFE_DELETE(_p);}
+private:
+    T*  _p;
+};
+
+template<typename T>
+class ScopeDeleteArray {
+public:
+    ScopeDeleteArray(T* p) : _p(p) {}
+    ~ScopeDeleteArray()    {SAFE_DELETE_ARRAY(_p);}
+private:
+    T*  _p;
+};
+
+template<typename T>
+class ScopeRelease {
+public:
+    ScopeRelease(T* p) : _p(p) {}
+    ~ScopeRelease()    {SAFE_RELEASE(_p);}
+private:
+    T*  _p;
+};
+
+template<typename T>
+class ScopeLock {
+public:
+    ScopeLock(T& mutex) : _mutex(mutex) {_mutex.lock();}
+    ~ScopeLock()    {_mutex.unlock();}
+private:
+    T& _mutex;
+};
+
+#endif // HV_SCOPE_H_