first implementation of REST and JSON interfaces for eigerReceiver

git-svn-id: file:///afs/psi.ch/project/sls_det_software/svn/slsDetectorSoftware@799 951219d9-93cf-4727-9268-0efd64621fa3

slsDetectorSoftware/slsReceiver/RestHelper.h

@@ -0,0 +1,79 @@
+#include <Poco/Net/HTTPClientSession.h>
+#include <Poco/Net/HTTPRequest.h>
+#include <Poco/Net/HTTPResponse.h>
+#include <Poco/StreamCopier.h>
+#include <Poco/Path.h>
+#include <Poco/URI.h>
+#include <Poco/Exception.h>
+
+#include "JsonBox/Value.h"
+
+#include <iostream>
+#include <string>
+
+using namespace Poco::Net;
+using namespace Poco;
+
+
+class RestHelper {
+ public:
+
+  void init(std::string hostname, int port){
+    /*
+      
+     */
+    full_hostname = "http://"+hostname;
+    std::cout << full_hostname << std::endl;
+    session = new HTTPClientSession(hostname,port );
+  };
+
+  int get_json(std::string request, std::string* answer){
+    //TODO: implement a timeout and max_retries
+
+    uri = new URI(full_hostname+"/"+request);
+    std::string path(uri->getPathAndQuery());
+    if (path.empty()) path = "/";
+
+    // send request
+    HTTPRequest req(HTTPRequest::HTTP_GET, path, HTTPMessage::HTTP_1_1);
+    session->sendRequest(req);
+
+    // get response
+    HTTPResponse res;
+    //std::cout << res.getStatus() << " " << res.getReason() << std::endl;
+    std::istream &is = session->receiveResponse(res);
+    StreamCopier::copyToString(is, *answer);
+
+    return res.getStatus();
+  };
+
+  int get_json(std::string request, JsonBox::Value* json_value){
+    //TODO: implement a timeout and max_retries
+
+    uri = new URI(full_hostname+"/"+request);
+    std::string path(uri->getPathAndQuery());
+    if (path.empty()) path = "/";
+
+    // send request
+    HTTPRequest req(HTTPRequest::HTTP_GET, path, HTTPMessage::HTTP_1_1);
+    session->sendRequest(req);
+
+    // get response
+    HTTPResponse res;
+    //std::cout << res.getStatus() << " " << res.getReason() << std::endl;
+    std::string answer;
+    std::istream &is = session->receiveResponse(res);
+    StreamCopier::copyToString(is, answer);
+
+    std::cout << answer << std::endl;
+    //returning a Json struct
+    json_value->loadFromString(answer);
+
+    return res.getStatus();
+  };
+
+ private:
+  URI * uri;
+  HTTPClientSession *session;
+  std::string full_hostname;
+};