rssn 0.2.9

A comprehensive scientific computing library for Rust, aiming for feature parity with NumPy and SymPy.
Documentation 
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//! JSON-based FFI API for the Plugin Manager.

use std::ffi::CStr;
use std::ffi::CString;
use std::os::raw::c_char;

use serde::Deserialize;

use crate::ffi_apis::ffi_api::FfiResult;
use crate::plugins::manager::GLOBAL_PLUGIN_MANAGER;
use crate::symbolic::core::Expr;

#[derive(Deserialize)]
struct PluginExecutionRequest {
    plugin_name: String,
    command: String,
    args: Expr,
}

/// Executes a plugin command via JSON (args passed as JSON expr).
///
/// # Safety
///
/// This function is unsafe because it dereferences raw pointers as part of the FFI boundary.
/// The caller must ensure:
/// 1. All pointer arguments are valid and point to initialized memory.
/// 2. The memory layout of passed structures matches the expected C-ABI layout.
/// 3. Any pointers returned by this function are managed according to the API's ownership rules.
///
/// # Panics
///
/// This function may panic if the FFI input is malformed, null where not expected,
/// or if internal state synchronization fails (e.g., poisoned locks).
#[unsafe(no_mangle)]
pub unsafe extern "C" fn rssn_plugins_execute_json(json_ptr: *const c_char) -> *mut c_char {
    unsafe {
        if json_ptr.is_null() {
            return std::ptr::null_mut();
        }

        let json_str = match CStr::from_ptr(json_ptr).to_str() {
            | Ok(s) => s,
            | Err(_) => return std::ptr::null_mut(),
        };

        let req: PluginExecutionRequest = match serde_json::from_str(json_str) {
            | Ok(r) => r,
            | Err(e) => {
                let res: FfiResult<Expr, String> = FfiResult {
                    ok: None,
                    err: Some(e.to_string()),
                };

                return CString::new(serde_json::to_string(&res).unwrap())
                    .unwrap()
                    .into_raw();
            },
        };

        let manager = match GLOBAL_PLUGIN_MANAGER.read() {
            | Ok(m) => m,
            | Err(_) => {
                let res: FfiResult<Expr, String> = FfiResult {
                    ok: None,
                    err: Some("Lock poison".to_string()),
                };

                return CString::new(serde_json::to_string(&res).unwrap())
                    .unwrap()
                    .into_raw();
            },
        };

        match manager.execute_plugin(&req.plugin_name, &req.command, &req.args) {
            | Ok(result_expr) => {
                let res: FfiResult<Expr, String> = FfiResult {
                    ok: Some(result_expr),
                    err: None,
                };

                CString::new(serde_json::to_string(&res).unwrap())
                    .unwrap()
                    .into_raw()
            },
            | Err(e) => {
                let res: FfiResult<Expr, String> = FfiResult {
                    ok: None,
                    err: Some(e.to_string()),
                };

                CString::new(serde_json::to_string(&res).unwrap())
                    .unwrap()
                    .into_raw()
            },
        }
    }
}