Expose HTTP client to Canvas.

src/Canvas/FGCanvasSystemAdapter.cxx

@@ -20,6 +20,7 @@
 
 #include <Main/globals.hxx>
 #include <Main/util.hxx>
+#include <Network/HTTPClient.hxx>
 #include <Viewer/renderer.hxx>
 
 #include <osgDB/ReadFile>
@@ -98,4 +99,19 @@ namespace canvas
     return 0;
   }
 
+  //----------------------------------------------------------------------------
+  simgear::HTTP::Client* FGCanvasSystemAdapter::getHTTPClient() const
+  {
+    FGHTTPClient* http =
+      static_cast<FGHTTPClient*>(globals->get_subsystem("http"));
+
+    if( http )
+      return http->client();
+
+    SG_LOG( SG_IO,
+            SG_ALERT,
+            "FGCanvasSystemAdapter: Failed to get HTTP subsystem" );
+    return 0;
+  }
+
 }

src/Canvas/FGCanvasSystemAdapter.hxx

@@ -31,6 +31,7 @@ namespace canvas
       virtual void addCamera(osg::Camera* camera) const;
       virtual void removeCamera(osg::Camera* camera) const;
       virtual osg::Image* getImage(const std::string& path) const;
+      virtual simgear::HTTP::Client* getHTTPClient() const;
   };
 }
 

src/Scripting/NasalHTTP.cxx

@@ -82,6 +82,7 @@ static naRef f_http_load(const nasal::CallContext& ctx)
 naRef initNasalHTTP(naRef globals, naContext c)
 {
   using simgear::HTTP::Request;
+  typedef Request* (Request::*HTTPCallback)(const Request::Callback&);
   NasalRequest::init("http.Request")
     .member("url", &Request::url)
     .member("method", &Request::method)
@@ -94,9 +95,9 @@ naRef initNasalHTTP(naRef globals, naContext c)
     .member("reason", &Request::responseReason)
     .member("readyState", &Request::readyState)
     .method("abort", static_cast<void (Request::*)()>(&Request::abort))
-    .method("done", &Request::done)
-    .method("fail", &Request::fail)
-    .method("always", &Request::always);
+    .method("done", static_cast<HTTPCallback>(&Request::done))
+    .method("fail", static_cast<HTTPCallback>(&Request::fail))
+    .method("always", static_cast<HTTPCallback>(&Request::always));
 
   using simgear::HTTP::FileRequest;
   NasalFileRequest::init("http.FileRequest")