DiskSystem jsonified and sent to stdin of the script

common/CMakeLists.txt

@@ -105,7 +105,8 @@ set (COMMON_LIB_SRC_FILES
   exception/TimeOut.cpp
   exception/UserError.cpp
   exception/XrootCl.cpp
-  json/parser/JSONCParser.cpp
+  json/object/JSONObject.cpp
+  json/object/JSONCObject.cpp
   log/DummyLogger.cpp
   log/FileLogger.cpp
   log/LogContext.cpp
@@ -204,7 +205,8 @@ set (COMMON_UNIT_TESTS_LIB_SRC_FILES
   utils/UtilsTest.cpp
   optionalTest.cpp
   rangeTest.cpp
-  json/parser/JSONCParserTest.cpp
+  json/test/JSONCTestObject.cpp
+  json/test/JSONCObjectTest.cpp
 )
 
 add_library (ctacommonunittests SHARED

common/json/parser/JSONCParser.cpp → common/json/object/JSONCObject.cpp

@@ -16,100 +16,89 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <json-c/json.h>
-#include <json/json_object.h>
+#include "JSONCObject.hpp"
 
-#include "JSONCParser.hpp"
-#include "common/json/object/SchedulerHints.hpp"
-#include "common/json/object/TestObject.hpp"
-#include "common/exception/Exception.hpp"
-#include "JSONParserException.hpp"
+#include "JSONObjectException.hpp"
 
-namespace cta { namespace utils { namespace json { namespace parser {
-
-JSONCParser::JSONCParser() {
-  m_jsonObject = json_object_new_object();
+namespace cta { namespace utils { namespace json { namespace object { 
+  
+JSONCObject::JSONCObject():JSONObject() {
+  initializeJSONCObject();
 }
 
-void JSONCParser::setJSONToBeParsed(const std::string& json){
+void JSONCObject::setAttributesFromJSON(const std::string& json){
   //DO JSON_C deinitialization
   if(m_jsonObject != nullptr){
-    json_object_put(m_jsonObject);
-    m_jsonObject = nullptr;
+    destroyJSONCObject();
   }
   m_jsonObject = json_tokener_parse(json.c_str());
 }
 
-std::string JSONCParser::getJSON() const {
+std::string JSONCObject::getJSON() {
   return std::string(json_object_to_json_string_ext(m_jsonObject, JSON_C_TO_STRING_PLAIN));
 }
 
-JSONCParser::~JSONCParser() {
-  //Free the JSON object if initialized
-  if(m_jsonObject != nullptr){
-    json_object_put(m_jsonObject);
-    m_jsonObject = nullptr;
-  }
+void JSONCObject::initializeJSONCObject() {
+  m_jsonObject = json_object_new_object();
+}
+
+void JSONCObject::destroyJSONCObject() {
+  json_object_put(m_jsonObject);
+  m_jsonObject = nullptr;
 }
 
-json_object * JSONCParser::getJSONObject(const std::string& key){
+void JSONCObject::reinitializeJSONCObject() {
+  destroyJSONCObject();
+  initializeJSONCObject();
+}
+
+json_object * JSONCObject::getJSONObject(const std::string& key){
   json_object * objectRet;
   if(json_object_object_get_ex(m_jsonObject,key.c_str(),&objectRet)){
     return objectRet;
   }
   std::string errMsg = "In JSONCParser::getJSONObject(), the provided json does not contain any key named \""+key+"\".";
-  throw cta::exception::JSONParserException(errMsg);
+  throw cta::exception::JSONObjectException(errMsg);
 }
 
-////////////////////////////////////////////////////////////////////
-// JSONCParser::getValue() implementation START
-////////////////////////////////////////////////////////////////////
 template<>
-std::string JSONCParser::getValue(const std::string& key){
+std::string JSONCObject::jsonGetValue(const std::string& key){
   json_object * jsonObj = getJSONObject(key);
   return std::string(json_object_get_string(jsonObj));
 }
 
 template<>
-uint64_t JSONCParser::getValue(const std::string & key){
+uint64_t JSONCObject::jsonGetValue(const std::string & key){
   json_object * jsonObj = getJSONObject(key);
   return json_object_get_int64(jsonObj);
 }
 
 template<>
-double JSONCParser::getValue(const std::string & key){
+double JSONCObject::jsonGetValue(const std::string & key){
   json_object * jsonObj = getJSONObject(key);
   return json_object_get_double(jsonObj);
 }
-////////////////////////////////////////////////////////////////////
-// JSONCParser::getValue() implementation END
-////////////////////////////////////////////////////////////////////
 
-////////////////////////////////////////////////////////////////////
-// json::object::TestObject implementation START
-////////////////////////////////////////////////////////////////////
 template<>
-void JSONCParser::generateJSONFromObject(const object::TestObject & value){
-  json_object_object_add(m_jsonObject,"integer_number",json_object_new_int64(value.integer_number));
-  json_object_object_add(m_jsonObject,"str",json_object_new_string(value.str.c_str()));
-  json_object_object_add(m_jsonObject,"double_number",json_object_new_double(value.double_number));
+void JSONCObject::jsonSetValue(const std::string& key, const std::string & value){
+  json_object_object_add(m_jsonObject,key.c_str(),json_object_new_string(value.c_str()));
 }
 
 template<>
-object::TestObject JSONCParser::getObjectFromJSON(){
-  object::TestObject ret;
-  ret.str = getValue<std::string>("str");
-  ret.integer_number = getValue<uint64_t>("integer_number");
-  ret.double_number = getValue<double>("double_number");
-  return ret;
+void JSONCObject::jsonSetValue(const std::string& key, const double & value){
+  json_object_object_add(m_jsonObject,key.c_str(),json_object_new_double(value));
 }
-////////////////////////////////////////////////////////////////////
-// json::object::TestObject implementation END
-////////////////////////////////////////////////////////////////////
 
-template <>
-void JSONCParser::generateJSONFromObject(const object::SchedulerHints & value){
-  
+template<>
+void JSONCObject::jsonSetValue(const std::string& key, const uint64_t & value){
+  json_object_object_add(m_jsonObject,key.c_str(),json_object_new_int64(value));
+}
+
+JSONCObject::~JSONCObject() {
+  //Free the JSON object if initialized
+  if(m_jsonObject != nullptr){
+    destroyJSONCObject();
+  }
 }
 
 }}}}
\ No newline at end of file

common/json/parser/JSONCParser.hpp → common/json/object/JSONCObject.hpp

@@ -18,36 +18,32 @@
 
 #pragma once
 
-#include <string>
+#include "JSONObject.hpp"
 #include <json-c/json.h>
-#include <memory>
 
-namespace cta { namespace utils { namespace json { namespace parser {
-  
-class JSONCParser {
+namespace cta { namespace utils { namespace json { namespace object { 
+
+class JSONCObject : public JSONObject {
 public:
-  JSONCParser();
-  
-  void setJSONToBeParsed(const std::string & json);
+  JSONCObject();
+  virtual void setAttributesFromJSON(const std::string & json);
+  virtual std::string getJSON();
+  virtual ~JSONCObject();
+protected:
+  json_object * m_jsonObject = nullptr;
   
-  std::string getJSON() const;
+  void initializeJSONCObject();
+  void destroyJSONCObject();
+  void reinitializeJSONCObject();
   
   template<typename T>
-  void generateJSONFromObject(const T & value);
+  T jsonGetValue(const std::string & key);
   
   template<typename T>
-  T getObjectFromJSON();
-  
-  virtual ~JSONCParser();
-private:
-  json_object * m_jsonObject = nullptr;
-  
-  template<typename T>
-  T getValue(const std::string & key);
+  void jsonSetValue(const std::string & key, const T & value);
   
   json_object * getJSONObject(const std::string & key);
+  
 };
 
-
-}}}}
-
+}}}}
\ No newline at end of file

common/json/object/SchedulerHints.hpp → common/json/object/JSONObject.cpp

@@ -16,15 +16,11 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#pragma once 
-
-#include <string>
+#include "JSONObject.hpp"
 
 namespace cta { namespace utils { namespace json { namespace object { 
-  
-struct SchedulerHints {
-  int test;
-  std::string test2;
-};
- 
-}}}}
+
+JSONObject::~JSONObject() {
+}
+
+}}}}
\ No newline at end of file

common/json/object/JSONObject.hpp

+/*
+ * The CERN Tape Archive (CTA) project
+ * Copyright (C) 2019  CERN
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <string>
+
+namespace cta { namespace utils { namespace json { namespace object { 
+
+class JSONObject {
+public:
+  virtual std::string getJSON() = 0;
+  virtual void setAttributesFromJSON(const std::string & json) = 0;
+  virtual ~JSONObject();
+private:
+
+};
+
+}}}}

common/json/parser/JSONParserException.hpp → common/json/object/JSONObjectException.hpp

@@ -20,7 +20,7 @@
 
 namespace cta { namespace exception {
   
-class JSONParserException : public Exception {
+class JSONObjectException : public Exception {
   using Exception::Exception; 
 };
 

common/json/parser/JSONCParserTest.cpp → common/json/test/JSONCObjectTest.cpp

@@ -18,52 +18,38 @@
 
 #include <gtest/gtest.h>
 
-#include "common/json/parser/JSONCParser.hpp"
-#include "common/json/object/TestObject.hpp"
-#include "JSONParserException.hpp"
+#include "JSONCTestObject.hpp"
+#include "common/json/object/JSONObjectException.hpp"
 
 namespace unitTests {
   
 using namespace cta::utils;
 
-TEST(JSONCParserTest, testJSONGenerationFromObject) {
-  json::object::TestObject to;
+TEST(JSONCObjectTest, testJSONGenerationFromObject) {
+  JSONCTestObject to;
   to.double_number = 42.0;
   to.integer_number = 42;
   to.str = "forty two";
-  json::parser::JSONCParser parser;
-  parser.generateJSONFromObject(to);
-  ASSERT_EQ("{\"integer_number\":42,\"str\":\"forty two\",\"double_number\":42.000000}",parser.getJSON());
+  ASSERT_EQ("{\"integer_number\":42,\"str\":\"forty two\",\"double_number\":42.000000}",to.getJSON());
 }
 
-TEST(JSONCParserTest, testObjectGenerationFromJSON){
+TEST(JSONCObjectTest, testObjectGenerationFromJSON){
   std::string json = "{\"integer_number\":42,\"str\":\"forty two\",\"double_number\":42.000000}";
-  json::parser::JSONCParser parser;
-  parser.setJSONToBeParsed(json);
-  json::object::TestObject to = parser.getObjectFromJSON<decltype(to)>();
+  JSONCTestObject to;
+  to.setAttributesFromJSON(json);
   ASSERT_EQ(42,to.integer_number);
   ASSERT_EQ("forty two",to.str);
   ASSERT_EQ(42.000000,to.double_number);
 }
 
-TEST(JSONCParserTest, testJSONCParserGetObjectFromUninitializedJSON){
-  json::parser::JSONCParser parser;
-  ASSERT_THROW(parser.getObjectFromJSON<json::object::TestObject>(),cta::exception::JSONParserException);
+TEST(JSONCObjectTest, testJSONCParserGetJSONShouldReturnDefaultValues){
+  JSONCTestObject to;
+  ASSERT_EQ("{\"integer_number\":0,\"str\":\"\",\"double_number\":0.000000}",to.getJSON());
 }
 
-TEST(JSONCParserTest, testJSONCParserGetJSONShouldReturnEmptyJSON){
-  json::parser::JSONCParser parser;
-  ASSERT_EQ("{}",parser.getJSON());
-}
-
-TEST(JSONCParserTest, testJSONCParserSetJSONToBeParsedWrongJSONFormat){
-  json::parser::JSONCParser parser;
-  parser.setJSONToBeParsed("WRONG_JSON_STRING");
-  ASSERT_EQ("null",parser.getJSON());
-  
-  parser.setJSONToBeParsed("{\"test");
-  ASSERT_EQ("null",parser.getJSON());
-  ASSERT_THROW(parser.getObjectFromJSON<json::object::TestObject>(),cta::exception::JSONParserException);
+TEST(JSONCObjectTest, testJSONCParserSetJSONToBeParsedWrongJSONFormat){
+  JSONCTestObject to;
+  ASSERT_THROW(to.setAttributesFromJSON("WRONG_JSON_STRING"),cta::exception::JSONObjectException);
 }
 
 }
\ No newline at end of file

common/json/test/JSONCTestObject.cpp

+/*
+ * The CERN Tape Archive (CTA) project
+ * Copyright (C) 2019  CERN
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#include "JSONCTestObject.hpp"
+
+namespace unitTests {
+
+JSONCTestObject::JSONCTestObject():JSONCObject(), TestObject()  {
+  
+}
+
+void JSONCTestObject::setAttributesFromJSON(const std::string & json){
+  JSONCObject::setAttributesFromJSON(json);
+  double_number = jsonGetValue<double>("double_number");
+  integer_number = jsonGetValue<uint64_t>("integer_number");
+  str = jsonGetValue<std::string>("str");
+}
+
+std::string JSONCTestObject::getJSON() {
+  reinitializeJSONCObject();
+  jsonSetValue("integer_number",integer_number);
+  jsonSetValue("str",str);
+  jsonSetValue("double_number",double_number);
+  return JSONCObject::getJSON();
+}
+
+JSONCTestObject::~JSONCTestObject() {
+}
+
+}
\ No newline at end of file

common/json/test/JSONCTestObject.hpp

+/*
+ * The CERN Tape Archive (CTA) project
+ * Copyright (C) 2019  CERN
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "common/json/object/JSONCObject.hpp"
+#include "TestObject.hpp"
+
+using namespace cta::utils::json;
+
+namespace unitTests {
+
+class JSONCTestObject : public object::JSONCObject, public TestObject {
+public:
+  JSONCTestObject();
+  void setAttributesFromJSON(const std::string & json) override;
+  std::string getJSON() override;
+  virtual ~JSONCTestObject();
+private:
+
+};
+
+}

common/json/object/TestObject.hpp → common/json/test/TestObject.hpp

@@ -20,7 +20,7 @@
 
 #include <string>
 
-namespace cta { namespace utils { namespace json { namespace object { 
+namespace unitTests {
 
   struct TestObject {
     uint64_t integer_number;
@@ -28,4 +28,4 @@ namespace cta { namespace utils { namespace json { namespace object {
     double double_number;
   };
   
-}}}}
\ No newline at end of file
+}
\ No newline at end of file

disk/CMakeLists.txt

@@ -28,6 +28,7 @@ add_library(ctadisk SHARED
   DiskFile.cpp
   RadosStriperPool.cpp
   DiskSystem.cpp
+  JSONDiskSystem.cpp
 )
 
 target_link_libraries (ctadisk XrdCl cryptopp radosstriper)

disk/DiskSystem.cpp

@@ -17,7 +17,7 @@
  */
 
 #include "DiskSystem.hpp"
-
+#include "JSONDiskSystem.hpp"
 #include <algorithm>
 #include "common/exception/Exception.hpp"
 #include "common/threading/SubProcess.hpp"
@@ -37,9 +37,9 @@ const DiskSystem& DiskSystemList::at(const std::string& name) const {
 }
 
 //------------------------------------------------------------------------------
-// DiskSystemList::getFSNAme()
+// DiskSystemList::getDSName()
 //------------------------------------------------------------------------------
-std::string DiskSystemList::getDSNAme(const std::string& fileURL) const {
+std::string DiskSystemList::getDSName(const std::string& fileURL) const {
   // First if the regexes have not been created yet, do so.
   if (m_pointersAndRegexes.empty() && size()) {
     for (const auto &ds: *this) {
@@ -58,6 +58,17 @@ std::string DiskSystemList::getDSNAme(const std::string& fileURL) const {
   throw std::out_of_range("In DiskSystemList::getDSNAme(): not match for fileURL");
 }
 
+//------------------------------------------------------------------------------
+// DiskSystemList::setFetchEosFreeSpaceScript()
+//------------------------------------------------------------------------------
+void DiskSystemList::setFetchEosFreeSpaceScript(const std::string& path){
+  m_fetchEosFreeSpaceScript = path;
+}
+
+std::string DiskSystemList::getFetchEosFreeSpaceScript() const{
+  return m_fetchEosFreeSpaceScript;
+}
+
 //------------------------------------------------------------------------------
 // DiskSystemFreeSpaceList::fetchFileSystemFreeSpace()
 //------------------------------------------------------------------------------
@@ -72,8 +83,16 @@ void DiskSystemFreeSpaceList::fetchDiskSystemFreeSpace(const std::set<std::strin
     uint64_t freeSpace = 0;
     try {
       std::vector<std::string> regexResult;
-      regexResult = eosDiskSystem.exec(m_systemList.at(ds).freeSpaceQueryURL);
+      auto & currentDiskSystem = m_systemList.at(ds);
+      regexResult = eosDiskSystem.exec(currentDiskSystem.freeSpaceQueryURL);
       if (regexResult.size()) {
+          try {
+            //TODO:  TO BE CONTINUED
+          cta::disk::JSONDiskSystem jsoncDiskSystem(currentDiskSystem);
+          freeSpace = fetchEosFreeSpaceWithScript(m_systemList.getFetchEosFreeSpaceScript(),jsoncDiskSystem.getJSON(),lc);
+        } catch(const cta::disk::FetchEosFreeSpaceScriptException &ex){
+          
+        }
         freeSpace = fetchEosFreeSpace(regexResult.at(1), regexResult.at(2), lc);
         goto found;
       }
@@ -150,6 +169,30 @@ uint64_t DiskSystemFreeSpaceList::fetchConstantFreeSpace(const std::string& inst
   return utils::toUint64(instanceAddress);
 }
 
-
+//------------------------------------------------------------------------------
+// DiskSystemFreeSpaceList::fetchEosFreeSpaceWithScript()
+//------------------------------------------------------------------------------
+uint64_t DiskSystemFreeSpaceList::fetchEosFreeSpaceWithScript(const std::string& scriptPath, const std::string& jsonInput, log::LogContext& lc){
+  //TODO A CONTINUER
+  cta::threading::SubProcess sp(scriptPath,{scriptPath},jsonInput);
+   sp.wait();
+  try {
+    std::string errMsg = "In DiskSystemFreeSpaceList::fetchEosFreeSpaceWithScript(), failed to call \"" + scriptPath;
+    exception::Errnum::throwOnNonZero(sp.exitValue(),errMsg);
+  } catch (exception::Exception & ex) {
+    ex.getMessage() << " scriptPath: " << scriptPath << " stderr: " << sp.stderr();
+    throw cta::disk::FetchEosFreeSpaceScriptException(ex.getMessage().str());
+  }
+  if (sp.wasKilled()) {
+    std::string errMsg = "In DiskSystemFreeSpaceList::fetchEosFreeSpaceWithScript(): " + scriptPath + " killed by signal: ";
+    exception::Exception ex(errMsg);
+    ex.getMessage() << utils::toString(sp.killSignal());
+    throw cta::disk::FetchEosFreeSpaceScriptException(ex.getMessage().str());
+  }
+  // Look for the result line for default space.
+  std::istringstream spStdoutIss(sp.stdout());
+  lc.log(log::CRIT,spStdoutIss.str());
+  throw cta::disk::FetchEosFreeSpaceScriptException("Test backpressure with script");
+}
 
 }} // namespace cta::disk
\ No newline at end of file

disk/DiskSystem.hpp

@@ -39,6 +39,7 @@ namespace cta { namespace disk {
  *  interval), and the expected external bandwidth from sources external to CTA.
  */
 CTA_GENERATE_EXCEPTION_CLASS(FetchEosFreeSpaceException);
+CTA_GENERATE_EXCEPTION_CLASS(FetchEosFreeSpaceScriptException);
 
 struct DiskSystem {
   std::string name;
@@ -57,11 +58,16 @@ class DiskSystemList: public std::list<DiskSystem> {
   
 public:
   /** Get the filesystem for a given destination URL */
-  std::string getDSNAme(const std::string &fileURL) const;
+  std::string getDSName(const std::string &fileURL) const;
   
   /** Get the file system parameters from a file system name */
   const DiskSystem & at(const std::string &name) const;
   
+  /** Get the fetch EOS free space script path */
+  std::string getFetchEosFreeSpaceScript() const;
+  
+  void setFetchEosFreeSpaceScript(const std::string & path);
+  
 private:
   struct PointerAndRegex {
     PointerAndRegex(const DiskSystem & dsys, const std::string &re): ds(dsys), regex(re) {}
@@ -70,6 +76,7 @@ private:
   };
   
   mutable std::list<PointerAndRegex> m_pointersAndRegexes;
+  std::string m_fetchEosFreeSpaceScript;
   
 };
 
@@ -95,6 +102,7 @@ private:
   DiskSystemList &m_systemList;
   uint64_t fetchEosFreeSpace(const std::string & instanceAddress, const std::string & spaceName,log::LogContext & lc);
   uint64_t fetchConstantFreeSpace(const std::string & instanceAddress, log::LogContext & lc);
+  uint64_t fetchEosFreeSpaceWithScript(const std::string & scriptPath, const std::string & jsonInput, log::LogContext &lc);
 };
 
 }} // namespace cta::common

disk/DiskSystemTest.cpp

@@ -106,15 +106,15 @@ namespace unitTests {
     
     std::string dstURL = "root://ctaeos.archiveretrieve-1215709git0e38ccd0-xi98.svc.cluster.local//eos/ctaeos/cta/54065a67-a3ea-4a44-b213-6f6a6f4e2cf4?eos.lfn=fxid:7&eos.ruid=0&eos.rgid=0&eos.injection=1&eos.workflow=retrieve_written&eos.space=spinners&toto=5";
     
-    ASSERT_EQ(m_diskSystemSpinner.name,allDiskSystem.getDSNAme(dstURL));
+    ASSERT_EQ(m_diskSystemSpinner.name,allDiskSystem.getDSName(dstURL));
     
     dstURL = "root://ctaeos.archiveretrieve-1215709git0e38ccd0-xi98.svc.cluster.local//eos/ctaeos/cta/54065a67-a3ea-4a44-b213-6f6a6f4e2cf4?eos.lfn=fxid:7&eos.ruid=0&eos.rgid=0&eos.injection=1&eos.workflow=retrieve_written&eos.space=default";
     
-    ASSERT_EQ(m_diskSystemDefault.name,allDiskSystem.getDSNAme(dstURL));
+    ASSERT_EQ(m_diskSystemDefault.name,allDiskSystem.getDSName(dstURL));
     
     dstURL = "root://ctaeos.archiveretrieve-1215709git0e38ccd0-xi98.svc.cluster.local//eos/ctaeos/cta/54065a67-a3ea-4a44-b213-6f6a6f4e2cf4?eos.lfn=fxid:7&eos.ruid=0&eos.rgid=0&eos.injection=1&eos.workflow=retrieve_written";
     
-    ASSERT_THROW(allDiskSystem.getDSNAme(dstURL),std::out_of_range);