There are a few ways to pass data and parameters between a Golang application and a loaded plugin. Here are some common approaches:
Function Arguments/Return Values: The simplest way is to define your plugin's functions with appropriate input and output parameters. You can pass data to a plugin by including the required parameters in the function call, and the plugin can return any required results.
Structs/Interfaces: You can define and use shared structs or interfaces between your main application and the plugin. By defining a common data structure or interface, you can easily pass data between the application and the plugin.
Embedded Methods: If your plugin needs to access the application's data, you can define embedded methods on the plugin's type. The plugin can then call these methods to access the necessary data from the parent application.
Shared Memory: If you require more complex and continuous data exchange, you can consider using shared memory mechanisms like mmap or memory-mapped files. Both the main application and the plugin can write/read to/from this shared memory region.
Message Passing: Another option is to use some form of message passing mechanism like channels or message queues. Your main application and plugin can communicate by sending messages through these channels/queues.
The specific approach to use depends on your requirements, the amount and complexity of data to exchange, performance considerations, and the level of decoupling needed between the application and the plugin.