From 6d9096193ba9ef1dec13d5582a345bf89270d2c0 Mon Sep 17 00:00:00 2001
From: tastytea <tastytea@tastytea.de>
Date: Sat, 4 Jan 2020 11:37:08 +0100
Subject: [PATCH] Add CURLException.

---
 include/exceptions.hpp | 78 ++++++++++++++++++++++++++++++++++++++++++
 include/mastodonpp.hpp | 21 ++++++++++--
 src/exceptions.cpp     | 50 +++++++++++++++++++++++++++
 3 files changed, 146 insertions(+), 3 deletions(-)
 create mode 100644 include/exceptions.hpp
 create mode 100644 src/exceptions.cpp

diff --git a/include/exceptions.hpp b/include/exceptions.hpp
new file mode 100644
index 0000000..875ef0f
--- /dev/null
+++ b/include/exceptions.hpp
@@ -0,0 +1,78 @@
+/*  This file is part of mastodonpp.
+ *  Copyright © 2020 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  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 Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MASTODONPP_EXCEPTIONS_HPP
+#define MASTODONPP_EXCEPTIONS_HPP
+
+#include <curl/curl.h>
+
+#include <cstdint>
+#include <exception>
+#include <string>
+
+namespace mastodonpp
+{
+
+using std::uint16_t;
+using std::exception;
+using std::string;
+
+/*!
+ *  @brief  Exception for libcurl errors.
+ *
+ *  @since  0.1.0
+ */
+class CURLException : public exception
+{
+public:
+    /*!
+     *  @brief  Constructor with error code and message.
+     *
+     *  @since  0.1.0
+     */
+    explicit CURLException(const CURLcode &error, string message);
+
+    /*!
+     *  @brief Constructor with error code, message and error buffer.
+     *
+     *  @since  0.1.0
+     */
+    explicit CURLException(const CURLcode &error, string message,
+                           string error_buffer);
+
+    /*!
+     *  @brief  The error code returned by libcurl.
+     *
+     *  @since  0.1.0
+     */
+    const CURLcode error_code;
+
+    /*!
+     *  @brief  Returns the error code, message and error buffer.
+     *
+     *  @since  0.1.0
+     */
+    [[nodiscard]]
+    const char *what() const noexcept override;
+
+private:
+    const string _message;
+    const string _error_buffer;
+};
+
+} // namespace mastodonpp
+
+#endif  // MASTODONPP_EXCEPTIONS_HPP
diff --git a/include/mastodonpp.hpp b/include/mastodonpp.hpp
index 6ca882d..9d32d9c 100644
--- a/include/mastodonpp.hpp
+++ b/include/mastodonpp.hpp
@@ -18,6 +18,7 @@
 #define MASTODONPP_HPP
 
 #include "api.hpp"
+#include "exceptions.hpp"
 #include "instance.hpp"
 #include "request.hpp"
 #include "return_types.hpp"
@@ -42,12 +43,26 @@
  *
  *  Or compile your code with `g++ $(pkg-config --cflags --libs mastodonpp)`.
  *
- *  @section Example
+ *  @subsection Example
  *
  *  @code
- *  mastodonpp::Instance instance{"example.com", ""};
- *  mastodonpp::Request request{instance};
+ *  try
+ *  {
+ *      mastodonpp::Instance instance{"example.com", ""};
+ *      mastodonpp::Request request{instance};
+ *      auto answer{request.get(mastodonpp::API::v1::instance)};
+ *      std::cout << answer << std::endl;
+ *  }
+ *  catch (const mastodonpp::CURLException &e)
+ *  {
+ *      std::cerr << e.what() << std::endl;
+ *  }
  *  @endcode
+ *
+ *  @section exceptions Exceptions
+ *
+ *  Any unrecoverable libcurl error will be thrown as a
+ *  mastodonpp::CURLException.
  */
 
 /*!
diff --git a/src/exceptions.cpp b/src/exceptions.cpp
new file mode 100644
index 0000000..381b6d8
--- /dev/null
+++ b/src/exceptions.cpp
@@ -0,0 +1,50 @@
+/*  This file is part of mastodonpp.
+ *  Copyright © 2020 tastytea <tastytea@tastytea.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation, version 3.
+ *
+ *  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 Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "exceptions.hpp"
+
+#include <utility>
+
+namespace mastodonpp
+{
+
+using std::to_string;
+using std::move;
+
+CURLException::CURLException(const CURLcode &error, string message)
+    : error_code{error}
+    , _message{move(message)}
+{}
+
+CURLException::CURLException(const CURLcode &error, string message,
+                             string error_buffer)
+    : error_code{error}
+    , _message{move(message)}
+    , _error_buffer{move(error_buffer)}
+{}
+
+const char *CURLException::what() const noexcept
+{
+    static string error_string{"libCURL error: " + to_string(error_code)
+        + " - " + _message};
+    if (!_error_buffer.empty())
+    {
+        error_string.append("[" + _error_buffer + "]");
+    }
+    return error_string.c_str();
+}
+
+} // namespace mastodonpp