Implemented http connection + shared_impl

Shared Impl provides Java/C# style reference semantics for C++ types.

CMakeLists.txt

@@ -45,6 +45,7 @@ include_directories( ${Boost_INCLUDE_DIR} )
 include_directories( include )
 
 set( sources 
+  src/http_connection.cpp
   src/value.cpp
   src/lexical_cast.cpp
   src/spin_lock.cpp 

include/fc/http/connection.hpp

@@ -0,0 +1,57 @@
+#pragma once
+#include <fc/vector.hpp>
+#include <fc/string.hpp>
+#include <fc/shared_impl.hpp>
+
+namespace fc { 
+  namespace ip { class endpoint; }
+  class tcp_socket;
+
+  namespace http {
+
+  struct header {
+    fc::string key;
+    fc::string val;
+  };
+
+  struct reply {
+     enum status_code {
+         OK                  = 200,
+         NotFound            = 404,
+         Found               = 302,
+         InternalServerError = 500
+     };
+     int                     status;
+     fc::vector<header>      headers;
+     fc::vector<char>        body;
+  };
+
+  struct request {
+     fc::string              method;
+     fc::string              domain;
+     fc::string              path;
+     fc::vector<header>      headers;
+     fc::vector<char>        body;
+  };
+
+  /**
+   *  Connections have reference semantics, all copies refer to the same
+   *  underlying socket.  
+   */
+  class connection {
+    public:
+      // used for clients
+      void         connect_to( const fc::ip::endpoint& ep );
+      http::reply  request( const fc::string& method, const fc::string& url, const fc::string& body );
+
+      // used for servers
+      fc::tcp_socket& get_socket();
+
+      http::request    read_request();
+      void             send_reply( const http::reply& );
+
+      FC_REFERENCE_TYPE(connection)
+  };
+
+} } // fc::http
+

include/fc/shared_impl.cpp

@@ -0,0 +1,82 @@
+#pragma once
+#include <fc/shared_impl.hpp>
+
+namespace fc {
+template<typename T>
+typename shared_impl<T>::impl& shared_impl<T>::operator*  ()const { return *_impl; }
+
+template<typename T>
+typename shared_impl<T>::impl* shared_impl<T>::operator-> ()const { return _impl.get(); }
+
+template<typename T>
+template<typename U>
+shared_impl<T>::shared_impl( U&& u ):_impl(fc::forward<U>(u)){}
+
+template<typename T>
+shared_impl<T>::shared_impl( const shared_impl<T>& u ):_impl(u._impl){}
+
+template<typename T>
+shared_impl<T>::shared_impl( shared_impl<T>&& u ):_impl(fc::move(u._impl)){}
+
+template<typename T>
+shared_impl<T>& shared_impl<T>::operator=( shared_impl<T>&& u ) {
+  fc::swap(_impl,u._impl);
+  return *this;
+}
+template<typename T>
+shared_impl<T>& shared_impl<T>::operator=( const shared_impl<T>& u ) {
+  _impl = u._impl;
+  return *this;
+}
+
+template<typename T>
+bool shared_impl<T>::operator !()const { return !_impl; }
+
+template<typename T>
+shared_impl<T>::~shared_impl(){}
+
+}
+
+#define FC_REFERENCE_TYPE_IMPL( TYPE ) \
+template<typename A1> \
+TYPE::TYPE( A1&& a1 ) \
+:my( new typename fc::shared_impl<TYPE>::impl( fc::forward<A1>(a1) ) ){}\
+template<typename A1,typename A2> \
+TYPE::TYPE( A1&& a1, A2&& a2 ) \
+:my( new typename fc::shared_impl<TYPE>::impl( fc::forward<A1>(a1), fc::forward<A2>(a2) ) ){}\
+template<typename A1,typename A2, typename A3> \
+TYPE::TYPE( A1&& a1, A2&& a2, A3&& a3 ) \
+:my( new typename fc::shared_impl<TYPE>::impl( fc::forward<A1>(a1), fc::forward<A2>(a2), fc::forward<A3>(a3) ) ){}\
+TYPE::TYPE( shared_impl<TYPE>::impl* m ) \
+:my(m){}\
+TYPE::TYPE( TYPE* c )\
+:my(fc::move(c->my)){ delete c; }\
+TYPE::TYPE( TYPE&& c )\
+:my(fc::move(c.my)){}\
+TYPE::TYPE( const TYPE& c )\
+:my(c.my){}\
+TYPE::TYPE() \
+:my( new typename fc::shared_impl<TYPE>::impl( ) ){}\
+TYPE::~TYPE(){}\
+bool TYPE::operator !()const { return !my; }\
+TYPE& TYPE::operator = ( const TYPE& c ) {\
+  my = c.my;\
+  return *this;\
+}\
+TYPE& TYPE::operator = ( TYPE&& c ) {\
+  fc::swap( my._impl, c.my._impl );\
+  return *this;\
+}\
+TYPE& TYPE::operator = ( TYPE* c ) {\
+  fc::swap( my._impl, c->my._impl );\
+  delete c;\
+  return *this;\
+} \
+bool operator==( const TYPE& a, const TYPE& b ) {\
+  return a.my._impl.get() == b.my._impl.get(); \
+} \
+bool operator!=( const TYPE& a, const TYPE& b ) {\
+  return a.my._impl.get() != b.my._impl.get(); \
+}
+
+

include/fc/shared_impl.hpp

@@ -0,0 +1,161 @@
+#pragma once
+#include <fc/shared_ptr.hpp>
+
+namespace fc {
+  /**
+   *  @class shared_impl<T>
+   *  @brief used to create types with reference semantics 
+   *
+   *  A type with reference semantics is effectively a shared pointer except that
+   *  it is used like a Java or C# type using '.' notation instead of -> notation.
+   *
+   *  It is ideal for use with classes that almost always get managed by a shared
+   *  pointer (sockets and long-lived resources).  These types are rarely, if ever
+   *  copied by value and often by-value copy or 'deep-copy' has no real meaning.
+   *
+   *  An additional feature of shared_impl<T> is that your classes implementation
+   *  should be private and defined entirely in your source file.  There should be
+   *  no member variables defined in your types header.
+   *
+   *  To make this design pattern work requires a lot of 'boiler-plate' code for
+   *  handling assignments, moves, copies, etc that cannot be provided via tradtional
+   *  means such as templates or base classes. 
+   *
+   *  To create a new type with reference semantics you place FC_REFERENCE_TYPE(type) 
+   *  inside the private section of 'type'. Then in your source file you will
+   *  need to define your 'private' data.
+   *
+   *  @code
+   *  #include <your_type.hpp>
+   *
+   *  FC_START_SHARED_IMPL( your_namespace::your_type )
+   *    impl( int x, int y ); // custom constructor
+   *
+   *    ...
+   *    int member_variable;
+   *    your private member variables / methods go here.
+   *    ...
+   *  FC_END_SHARED_IMPL
+   *  #include <fc/shared_impl.cpp>
+   *  @endcode
+   *
+   *
+   *  Lastly, you will need to provide the implementation your class below.  This
+   *  implementation will need to provide the matching implementations for the
+   *  methods declared by FC_REFERENCE_TYPE(type) in your header.  To do this
+   *  use the FC_REFERENCE_TYPE_IMPL(type)
+   *
+   *  @code
+   *  namespace your_namespace {
+   *   FC_REFERENCE_TYPE(your_type) 
+   *   ... your methods here...
+   *  } 
+   *  @endcode
+   * 
+   *  Within the body of your methods you can access your private data and members
+   *  via using 'my->member_variable' 
+   *    
+   *  If you want to define custom constructors for your reference type, you will
+   *  need to implement them inside the FC_START_SHARED_IMPL block using the pattern:
+   *
+   *  @code
+   *  FC_START_SHARED_IMPL( your_namespace::your_type )
+   *    impl( int x, int y ){} // custom constructor
+   *  FC_END_SHARED_IMPL
+   *  @code
+   *  
+   *  A limited number (3) of arguments are supported for custom constructors.
+   *
+   *  Once you have defined your reference type you can use it like so:
+   *
+   *  @code
+   *    your_type  val  = nullptr;  // create a null type
+   *    your_type  val2 = new your_type(...); // construct a new instance, unnecessary temporary heap alloc
+   *    your_type  val3(...);                 // constructs a new instance, more effecient
+   *
+   *    val2.your_method();
+   *    val2 = nullptr; // reset val2 to a null object
+   *
+   *    val2 = val3;  // val2 and val3 now reference the same data
+   *    if( !!val2 ){} // val2 is not null
+   *    else{} // val2 is null
+   *  @endcode
+   *
+   *  As you can see, when creating types with this method your code will
+   *  look and act like a Java or C# garbage collected type.
+   *
+   *  Often times your private methods will need to call your public methods, to achieve
+   *  this you can use the following techinque:
+   *
+   *  @code
+   *  FC_START_SHARED_IMPL( your_namespace::your_type )
+   *    void private_method( int x, int y ){
+   *      auto s = self();
+   *      s.public_method();
+   *    } 
+   *  FC_END_SHARED_IMPL
+   *  @code
+   *
+   *  For performance reasons, it is best to only call 'self()' once and save the
+   *  result to avoid unnecessary copies of shared pointers which require atomic
+   *  operations.
+   *
+   */
+  template<typename T>
+  struct shared_impl {
+    struct impl;
+    impl& operator*  ()const;
+    impl* operator-> ()const;
+
+    bool operator !()const;
+
+    template<typename U>
+    shared_impl( U&& u );
+
+    shared_impl( const shared_impl& u );
+    shared_impl( shared_impl&& u );
+    shared_impl& operator=( shared_impl&& u );
+    shared_impl& operator=( const shared_impl& u );
+
+    ~shared_impl();
+
+    fc::shared_ptr<shared_impl::impl> _impl;
+  };
+
+}
+
+#define FC_REFERENCE_TYPE( TYPE ) \
+  public:\
+      TYPE(); \
+      TYPE( std::nullptr_t ); \
+      TYPE( TYPE*  ); \
+      TYPE( TYPE&&  ); \
+      TYPE( const TYPE&  ); \
+      template<typename A1> \
+      TYPE( A1&&  ); \
+      template<typename A1,typename A2> \
+      TYPE( A1&&, A2&&  ); \
+      template<typename A1,typename A2, typename A3> \
+      TYPE( A1&&, A2&&, A3&&  ); \
+      ~TYPE(); \
+      bool operator !()const; \
+      friend bool operator==( const TYPE& a, const TYPE& b ); \
+      friend bool operator!=( const TYPE& a, const TYPE& b ); \
+      TYPE& operator = ( const TYPE&  ); \
+      TYPE& operator = ( TYPE&&  );\
+      TYPE& operator = ( TYPE*  );\
+      TYPE& operator = ( std::nullptr_t  );\
+  private: \
+      friend class shared_impl<TYPE>::impl; \
+      TYPE( shared_impl<TYPE>::impl* m ); \
+      shared_impl<TYPE> my; 
+
+#define FC_START_SHARED_IMPL( SCOPED_TYPE )  \
+namespace fc { \
+template<> \
+struct fc::shared_impl<SCOPED_TYPE>::impl : public fc::retainable { \
+   SCOPED_TYPE self() { return SCOPED_TYPE(this); } \
+
+
+#define FC_END_SHARED_IMPL }; }
+

include/fc/shared_ptr.hpp

@@ -1,5 +1,4 @@
-#ifndef _FC_SHARED_PTR_HPP_
+#pragma once
-#define _FC_SHARED_PTR_HPP_
 #include <fc/utility.hpp>
 
 namespace fc {
@@ -83,4 +82,3 @@ namespace fc {
   }
 }
 
-#endif

src/http_connection.cpp

@@ -0,0 +1,98 @@
+#include <fc/http/connection.hpp>
+#include <fc/tcp_socket.hpp>
+#include <fc/sstream.hpp>
+
+
+FC_START_SHARED_IMPL(fc::http::connection)
+   fc::tcp_socket sock;
+
+   int read_until( char* buffer, char* end, char c = '\n' ) {
+      char* p = buffer;
+     // try {
+          while( p < end && sock.read(p,1) ) {
+            if( *p == c ) {
+              *p = '\0';
+              return (p - buffer)-1;
+            }
+            ++p;
+          }
+     // } catch ( ... ) {
+     //   elog("%s", fc::current_exception().diagnostic_information().c_str() );
+        //elog( "%s", fc::except_str().c_str() );
+     // }
+      return (p-buffer);
+   }
+
+   fc::http::reply parse_reply() {
+      fc::http::reply rep;
+      fc::vector<char> line(1024*8);
+      int s = read_until( line.data(), line.data()+line.size(), ' ' ); // HTTP/1.1
+      s = read_until( line.data(), line.data()+line.size(), ' ' ); // CODE
+      rep.status = fc::lexical_cast<int>(fc::string(line.data()));
+      s = read_until( line.data(), line.data()+line.size(), '\n' ); // DESCRIPTION
+
+      while( (s = read_until( line.data(), line.data()+line.size(), '\n' )) > 1 ) {
+        fc::http::header h;
+        char* end = line.data();
+        while( *end != ':' )++end;
+        h.key = fc::string(line.data(),end);
+        ++end; // skip ':'
+        ++end; // skip space
+        char* skey = end;
+        while( *end != '\r' ) ++end;
+        h.val = fc::string(skey,end);
+        rep.headers.push_back(h);
+        if( h.key == "Content-Length" ) {
+           rep.body.resize( fc::lexical_cast<int>( fc::string(h.val) ) );
+        }
+      }
+      if( rep.body.size() ) sock.read( rep.body.data(), rep.body.size() );
+      return rep;
+   }
+
+FC_END_SHARED_IMPL 
+#include <fc/shared_impl.cpp>
+
+
+
+namespace fc { namespace http {
+
+FC_REFERENCE_TYPE_IMPL( connection )
+
+
+// used for clients
+void       connection::connect_to( const fc::ip::endpoint& ep ) {
+  my->sock.connect_to( ep );
+}
+
+http::reply connection::request( const fc::string& method, 
+                                const fc::string& url, 
+                                const fc::string& body ) {
+  fc::stringstream req;
+  req << method <<" "<<url<<" HTTP/1.1\r\n";
+  if( body.size() ) req << "Content-Length: "<< body.size() << "\r\n";
+  req << "\r\n";
+
+  fc::string head = req.str();
+  my->sock.write( head.c_str(), head.size() );
+
+  if( body.size() ) 
+      my->sock.write( body.c_str(), body.size() );
+
+  return my->parse_reply();
+}
+
+// used for servers
+fc::tcp_socket& connection::get_socket() {
+  return my->sock;
+}
+
+http::request    connection::read_request() {
+  http::request r;
+  return r;
+}
+void            connection::send_reply( const http::reply& ) {
+  
+}
+
+} } // fc::http