implemented initial dpm core call functionality from module perspective

CMakeLists.txt

@@ -15,15 +15,19 @@ add_executable(
         include/dpm_interface_helpers.hpp
         src/dpm_interface_helpers.cpp
         src/handlers.cpp
+        src/module_interface.cpp
 )
 
 target_include_directories(dpm PRIVATE include)
 target_link_libraries(dpm dl)
 
+# Export symbols for dynamic loading
+target_link_options(dpm PRIVATE -rdynamic)
+
 # Add the info module
 add_library(info MODULE modules/info.cpp)
 set_target_properties(info PROPERTIES
         PREFIX ""
         SUFFIX ".so"
         LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/modules"
-)
+)

include/module_interface.hpp

@@ -56,4 +56,7 @@ extern "C" {
 
     // Module description information
     const char* dpm_get_description(void);
+
+    // Callback function exposed by DPM core for modules to use
+    int dpm_core_callback(const char* action, const char* data);
 }

modules/info.cpp

@@ -1,38 +1,12 @@
-/**
+// info.cpp
-* @file info.cpp
-* @brief Implementation of the DPM info module
-*
-* Provides information about the DPM system through a module interface.
-* This module supports commands for displaying version information,
-* system details, and module help documentation.
-*
-* @copyright Copyright (c) 2025 SILO GROUP LLC
-* @author Chris Punches <chris.punches@silogroup.org>
-*
-* Part of the Dark Horse Linux Package Manager (DPM)
-*
-* 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, 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 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 <https://www.gnu.org/licenses/>.
-*
-* For bug reports or contributions, please contact the dhlp-contributors
-* mailing list at: https://lists.darkhorselinux.org/mailman/listinfo/dhlp-contributors
-*/
-
 #include <iostream>
 #include <string>
 #include <cstring>
 #include <vector>
 
+// Declaration of the DPM core function we want to call
+extern "C" int dpm_core_callback(const char* action, const char* data);
+
 // Implementation of the info module
 // This module provides information about the DPM system
 
@@ -56,6 +30,8 @@ extern "C" int dpm_module_execute(const char* command, int argc, char** argv) {
         std::cout << "  version    - Display DPM version information\n";
         std::cout << "  system     - Display system information\n";
         std::cout << "  help       - Display this help message\n";
+
+        dpm_core_callback("log", "No command specified, displayed help");
         return 0;
     }
 
@@ -63,12 +39,19 @@ extern "C" int dpm_module_execute(const char* command, int argc, char** argv) {
     std::string cmd(command);
 
     if (cmd == "version") {
+        dpm_core_callback("log", "Executing 'version' command");
+
         std::cout << "DPM Version: 0.1.0\n";
         std::cout << "Build Date: " << __DATE__ << "\n";
         std::cout << "Build Time: " << __TIME__ << "\n";
         return 0;
     }
     else if (cmd == "system") {
+        dpm_core_callback("log", "Executing 'system' command");
+
+        // Request config information
+        dpm_core_callback("get_config", "system.arch");
+
         std::cout << "System Information:\n";
         std::cout << "  OS: "
 #ifdef _WIN32
@@ -97,6 +80,8 @@ extern "C" int dpm_module_execute(const char* command, int argc, char** argv) {
         return 0;
     }
     else if (cmd == "help") {
+        dpm_core_callback("log", "Executing 'help' command");
+
         std::cout << "DPM Info Module - Provides information about the DPM system\n";
         std::cout << "Available commands:\n";
         std::cout << "  version    - Display DPM version information\n";
@@ -105,6 +90,9 @@ extern "C" int dpm_module_execute(const char* command, int argc, char** argv) {
         return 0;
     }
     else {
+        std::string error_msg = "Unknown command: " + cmd;
+        dpm_core_callback("log", error_msg.c_str());
+
         std::cerr << "Unknown command: " << cmd << "\n";
         std::cerr << "Run 'dpm info help' for a list of available commands\n";
         return 1;

src/module_interface.cpp

@@ -0,0 +1,73 @@
+/**
+* @file module_interface.cpp
+* @brief Implementation of the module interface functions
+*
+* Provides the implementation of functions declared in the module interface
+* that are part of the DPM core, such as callback functions available to modules.
+*
+* @copyright Copyright (c) 2025 SILO GROUP LLC
+* @author Chris Punches <chris.punches@silogroup.org>
+*
+* Part of the Dark Horse Linux Package Manager (DPM)
+*
+* 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, 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 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 <https://www.gnu.org/licenses/>.
+*
+* For bug reports or contributions, please contact the dhlp-contributors
+* mailing list at: https://lists.darkhorselinux.org/mailman/listinfo/dhlp-contributors
+*/
+
+#include "module_interface.hpp"
+#include <iostream>
+#include <string>
+
+/**
+ * @brief Function that modules can call to access DPM core functionality
+ *
+ * This function is exported by the DPM executable and can be called by
+ * dynamically loaded modules to access services or features of the core application.
+ *
+ * Note: In order for a module to use this functionality, it requires a forward declaration in the module:
+ * // Example:
+ * // Declaration of the DPM core function we want to call
+ *  extern "C" int dpm_core_callback(const char* action, const char* data);
+ *
+ * @param action The specific action or operation being requested
+ * @param data Additional data or parameters needed for the action
+ * @return Result code indicating success (0) or failure (non-zero)
+ */
+extern "C" int dpm_core_callback(const char* action, const char* data) {
+    // Implementation here
+    if (!action) {
+        std::cerr << "Error: Module callback received null action" << std::endl;
+        return 1;
+    }
+
+    std::string action_str(action);
+
+    if (action_str == "log") {
+        if (data) {
+            std::cout << "Module log: " << data << std::endl;
+        }
+        return 0;
+    }
+    else if (action_str == "get_config") {
+        if (data) {
+            std::cout << "Module requested config: " << data << std::endl;
+        }
+        return 0;
+    }
+
+    std::cerr << "Error: Unknown module callback action: " << action_str << std::endl;
+    return 1;
+}