From 95d5acc8c7e60255b19e7084e374eb26cc5d0ba3 Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Sat, 4 Apr 2020 13:21:59 +0200
Subject: Versioned plugins

---
 plugin.cpp | 48 ++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 8 deletions(-)

(limited to 'plugin.cpp')

diff --git a/plugin.cpp b/plugin.cpp
index 9c47ed2..c0a01fc 100644
--- a/plugin.cpp
+++ b/plugin.cpp
@@ -1,21 +1,22 @@
 #include "plugin.h"
 
 #include <boost/dll/import.hpp>
-#include <boost/shared_ptr.hpp>
 #include <boost/filesystem.hpp>
 
 #include <iostream>
 #include <filesystem>
 
-#include "plugin_interface.h"
-
 namespace dll = boost::dll;
 namespace fs = std::filesystem;
 using namespace std::string_literals;
 
-void load_plugins(Config& config)
+PluginLoader::PluginLoader(Config& config): m_config{config}
+{
+}
+
+void PluginLoader::load_plugins()
 {
- const auto& plugin_directories{config.PluginDirectories()};
+ const auto& plugin_directories{m_config.PluginDirectories()};
 
  for (const auto& dir: plugin_directories) {
   for (auto& path: fs::recursive_directory_iterator(dir)) {
@@ -23,14 +24,45 @@ void load_plugins(Config& config)
 
     dll::fs::path lib_path{path.path()};
 
+    try {
     boost::shared_ptr<webserver_plugin_interface> plugin = dll::import<webserver_plugin_interface>(lib_path, "webserver_plugin", dll::load_mode::append_decorations);
-    if (!plugin)
-     throw std::runtime_error("Can't load plugin");
+    if (plugin) {
+     if (plugin->version() != webserver_plugin_interface::interface_version)
+      throw std::runtime_error("Bad interface version for "s + path.path().generic_string() + ": "s + std::to_string(plugin->version()) + " vs. "s + std::to_string(webserver_plugin_interface::interface_version));
 
-    std::cout << "Plugin: " << plugin->generate_page("a") << std::endl;
+     if (m_plugins.contains(plugin->name()))
+      throw std::runtime_error("Plugin already exists: "s + plugin->name());
+
+     m_plugins.emplace(plugin->name(), plugin);
+
+     std::cout << "Found plugin: " << plugin->name() << std::endl;
+    } else
+     std::cout << "Can't load plugin from " << path.path().generic_string() << std::endl;
+    } catch (const std::exception& ex) {
+     std::cout << "Can't load plugin from " << path.path().generic_string() << ": " << ex.what() << std::endl;
+    }
    }
   }
  }
 
 }
 
+bool PluginLoader::validate_config()
+{
+ const auto& sites{m_config.Sites()};
+
+ for (const auto& site: sites) {
+  for (const auto& path: site.paths) {
+   if (path.type == Plugin) {
+    std::string plugin {path.params.at("plugin")};
+
+    if (!m_plugins.contains(plugin)) {
+     std::cout << "Configured plugin " << plugin << " not found" << std::endl;
+     return false;
+    }
+   }
+  }
+ }
+ return true;
+}
+
-- 
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