Merge Rust, C and C++ SDKs (#4)

* Generate native bindings from rust crate

* Add native instance and runtime statics

* Update README.md

src/native/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "tribufu-sdk"
+version = "0.0.0"
+description = "Tribufu Native"
+repository = "https://github.com/tribufu/tribufu-rust"
+authors = ["Tribufu <contact@tribufu.com>"]
+license = "UNLICENSED"
+edition = "2021"
+publish = false
+
+[lib]
+name = "tribufu_sdk"
+crate-type = ["rlib", "cdylib", "staticlib"]
+path = "lib.rs"
+
+[dependencies]
+tribufu = { path = "../../" }
+futures = "0.3.31"
+libc = "0.2.172"
+once_cell = "1.19.0"
+tokio = { version = "1.45.1", features = ["full"] }

src/native/api.rs

@@ -0,0 +1,88 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: UNLICENSED
+
+use crate::models::{TribufuApiCallbackContext, TribufuApiGetUserInfoCallback};
+use futures::lock::Mutex;
+use libc::{c_char, c_void};
+use once_cell::sync::Lazy;
+use std::ffi::CString;
+use std::ptr;
+use tokio::runtime::Runtime;
+use tribufu::apis::tribufu_generated_api::TribufuGeneratedApiClient;
+use tribufu::TribufuApi;
+
+static INSTANCE: Lazy<Mutex<Option<TribufuGeneratedApiClient>>> = Lazy::new(|| Mutex::new(None));
+static RUNTIME: Lazy<Runtime> = Lazy::new(|| Runtime::new().unwrap());
+
+/// Gets the version of the Tribufu API.
+#[no_mangle]
+pub extern "C" fn tribufu_api_get_version() -> *const c_char {
+    CString::new(TribufuApi::get_version()).unwrap().into_raw()
+}
+
+/// Gets the user agent string for the Tribufu API.
+#[no_mangle]
+pub extern "C" fn tribufu_api_get_user_agent() -> *const c_char {
+    CString::new(TribufuApi::get_user_agent())
+        .unwrap()
+        .into_raw()
+}
+
+/// Initialize the Tribufu API instance.
+///
+/// This must be called before any other API functions.
+#[no_mangle]
+pub extern "C" fn tribufu_api_initialize() -> bool {
+    let api = TribufuApi::from_env_or_default(None);
+
+    if INSTANCE.try_lock().is_none() {
+        return false;
+    }
+
+    let mut instance = INSTANCE.try_lock().unwrap();
+    *instance = Some(api);
+
+    true
+}
+
+/// Shutdown the Tribufu API instance.
+///
+/// This must be called when the API is no longer needed.
+#[no_mangle]
+pub extern "C" fn tribufu_api_shutdown() {
+    if INSTANCE.try_lock().is_none() {
+        return;
+    }
+
+    let mut instance = INSTANCE.try_lock().unwrap();
+    *instance = None;
+}
+
+#[no_mangle]
+#[allow(unused_variables)]
+pub extern "C" fn tribufu_api_get_user_info(
+    context: *mut c_void,
+    callback: TribufuApiGetUserInfoCallback,
+) {
+    let context = TribufuApiCallbackContext(context);
+
+    RUNTIME.spawn(async move {
+        let mut instance = INSTANCE.lock().await;
+        if instance.is_none() {
+            callback(context.as_ptr(), ptr::null());
+            return;
+        }
+
+        let api = instance.as_mut();
+        if api.is_none() {
+            callback(context.as_ptr(), ptr::null());
+            return;
+        }
+
+        let api = api.unwrap();
+
+        // TODO: Implement logic here
+
+        callback(context.as_ptr(), ptr::null());
+    });
+}

src/native/lib.rs

@@ -0,0 +1,8 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: UNLICENSED
+
+#![allow(dead_code)]
+
+pub mod api;
+pub mod mem;
+pub mod models;

src/native/mem.rs

@@ -0,0 +1,16 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: UNLICENSED
+
+use std::ffi::CString;
+use std::os::raw::c_char;
+
+#[no_mangle]
+pub extern "C" fn tribufu_free_string(ptr: *mut c_char) {
+    if ptr.is_null() {
+        return;
+    }
+
+    unsafe {
+        let _ = CString::from_raw(ptr);
+    }
+}

src/native/models.rs

@@ -0,0 +1,19 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: MIT
+
+use libc::c_void;
+
+pub struct TribufuApiCallbackContext(pub(crate) *mut c_void);
+
+impl TribufuApiCallbackContext {
+    pub(crate) fn as_ptr(&self) -> *mut c_void {
+        self.0
+    }
+}
+
+unsafe impl Send for TribufuApiCallbackContext {}
+unsafe impl Sync for TribufuApiCallbackContext {}
+
+pub type TribufuApiGetUserInfoCallbackData = c_void;
+pub type TribufuApiGetUserInfoCallback =
+    extern "C" fn(*mut c_void, *const TribufuApiGetUserInfoCallbackData);