MXS-2446 Provide access to used urls

Makes it possible to later verify that results are for the
urls one expects them to be.

maxutils/maxbase/include/maxbase/http.hh

@@ -172,6 +172,8 @@ public:
         virtual long wait_no_more_than() const = 0;
 
         virtual const std::vector<Result>& results() const = 0;
+
+        virtual const std::vector<std::string>& urls() const = 0;
     };
 
     /**
@@ -258,6 +260,16 @@ public:
         return m_sImp->results();
     }
 
+    /**
+     * The URLs the async operation was invoked with.
+     *
+     * @return Vector of urls.
+     */
+    const std::vector<std::string>& urls() const
+    {
+        return m_sImp->urls();
+    }
+
 public:
     Async(const std::shared_ptr<Imp>& sImp)
         : m_sImp(sImp)

maxutils/maxbase/src/http.cc

@@ -197,14 +197,20 @@ public:
         return 0;
     }
 
-    const std::vector<Result>& results() const
+    const vector<Result>& results() const
     {
         return m_results;
     }
 
+    const vector<string>& urls() const
+    {
+        return m_urls;
+    }
+
 private:
     Async::status_t m_status;
     vector<Result>  m_results;
+    vector<string>  m_urls;
 };
 
 class HttpImp : public Async::Imp
@@ -248,6 +254,8 @@ public:
     {
         mxb_assert(m_status == Async::ERROR);
 
+        m_urls = urls;
+
         m_results.reserve(urls.size());
         m_errbufs.reserve(urls.size());
 
@@ -417,11 +425,16 @@ public:
         return m_wait_no_more_than;
     }
 
-    const std::vector<Result>& results() const
+    const vector<Result>& results() const
     {
         return m_results;
     }
 
+    const vector<string>& urls() const
+    {
+        return m_urls;
+    }
+
 private:
     void update_timeout()
     {
@@ -441,6 +454,7 @@ private:
     unordered_map<CURL*, Context>            m_curls;
     int                                      m_still_running;
     long                                     m_wait_no_more_than;
+    vector<string>                           m_urls;
 };
 }