From a26d4b0122f30b958b417ed92d43f823fa89adb8 Mon Sep 17 00:00:00 2001
From: leeeon233 <leeeon233@gmail.com>
Date: Sat, 28 Jan 2023 19:59:37 +0800
Subject: [PATCH] feat: init ffi

---
 Cargo.lock                    | 50 +++++++++++++++++++++++++++++++++++
 crates/loro-ffi/Cargo.toml    | 18 +++++++++++++
 crates/loro-ffi/build.rs      | 35 ++++++++++++++++++++++++
 crates/loro-ffi/cbindgen.toml |  3 +++
 crates/loro-ffi/src/lib.rs    | 15 +++++++++++
 5 files changed, 121 insertions(+)
 create mode 100644 crates/loro-ffi/Cargo.toml
 create mode 100644 crates/loro-ffi/build.rs
 create mode 100644 crates/loro-ffi/cbindgen.toml
 create mode 100644 crates/loro-ffi/src/lib.rs

diff --git a/Cargo.lock b/Cargo.lock
index 0c87ca02..a98b90f8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -171,6 +171,25 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"
 
+[[package]]
+name = "cbindgen"
+version = "0.24.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6358dedf60f4d9b8db43ad187391afe959746101346fe51bb978126bec61dfb"
+dependencies = [
+ "clap",
+ "heck",
+ "indexmap",
+ "log",
+ "proc-macro2 1.0.47",
+ "quote 1.0.21",
+ "serde",
+ "serde_json",
+ "syn 1.0.105",
+ "tempfile",
+ "toml",
+]
+
 [[package]]
 name = "cc"
 version = "1.0.77"
@@ -216,9 +235,12 @@ version = "3.2.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "71655c45cb9845d3270c9d6df84ebe72b4dad3c2ba3f7023ad47c144e4e473a5"
 dependencies = [
+ "atty",
  "bitflags",
  "clap_lex",
  "indexmap",
+ "strsim",
+ "termcolor",
  "textwrap",
 ]
 
@@ -735,6 +757,25 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "loro-ffi"
+version = "0.1.0"
+dependencies = [
+ "cbindgen",
+ "loro-core",
+]
+
+[[package]]
+name = "loro-framework"
+version = "0.1.0"
+dependencies = [
+ "fxhash",
+ "loro-core",
+ "ring",
+ "rle",
+ "sha2",
+]
+
 [[package]]
 name = "loro-wasm"
 version = "0.1.0"
@@ -1629,6 +1670,15 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "toml"
+version = "0.5.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1333c76748e868a4d9d1017b5ab53171dfd095f70c712fdb4653a406547f598f"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "tracing"
 version = "0.1.37"
diff --git a/crates/loro-ffi/Cargo.toml b/crates/loro-ffi/Cargo.toml
new file mode 100644
index 00000000..ec547e66
--- /dev/null
+++ b/crates/loro-ffi/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "loro-ffi"
+version = "0.1.0"
+edition = "2021"
+build = "build.rs"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+loro-core = { path = "../loro-core" }
+
+[lib]
+crate-type = ["staticlib"]
+name = "loro"
+
+
+[build-dependencies]
+cbindgen = "0.24.3"
diff --git a/crates/loro-ffi/build.rs b/crates/loro-ffi/build.rs
new file mode 100644
index 00000000..03b51f64
--- /dev/null
+++ b/crates/loro-ffi/build.rs
@@ -0,0 +1,35 @@
+extern crate cbindgen;
+
+use cbindgen::Config;
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    let crate_dir = env::var("CARGO_MANIFEST_DIR").unwrap();
+
+    let package_name = env::var("CARGO_PKG_NAME").unwrap();
+    let output_file = target_dir()
+        .join(format!("{}.hpp", package_name))
+        .display()
+        .to_string();
+
+    let config = Config {
+        namespace: Some(String::from("loro_ffi")),
+        ..Default::default()
+    };
+
+    cbindgen::generate_with_config(&crate_dir, config)
+        .unwrap()
+        .write_to_file(&output_file);
+}
+
+/// Find the location of the `target/` directory. Note that this may be
+/// overridden by `cmake`, so we also need to check the `CARGO_TARGET_DIR`
+/// variable.
+fn target_dir() -> PathBuf {
+    if let Ok(target) = env::var("CARGO_TARGET_DIR") {
+        PathBuf::from(target)
+    } else {
+        PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()).join("target")
+    }
+}
diff --git a/crates/loro-ffi/cbindgen.toml b/crates/loro-ffi/cbindgen.toml
new file mode 100644
index 00000000..98188b59
--- /dev/null
+++ b/crates/loro-ffi/cbindgen.toml
@@ -0,0 +1,3 @@
+include_guard = "libloro_ffi_h"
+autogen_warning = "/* Warning, this file is autogenerated by cbindgen. Don't modify this manually. */"
+language = "C"
diff --git a/crates/loro-ffi/src/lib.rs b/crates/loro-ffi/src/lib.rs
new file mode 100644
index 00000000..b2b7c9a2
--- /dev/null
+++ b/crates/loro-ffi/src/lib.rs
@@ -0,0 +1,15 @@
+use loro_core::LoroCore;
+
+/// create Loro with a random unique client id
+#[no_mangle]
+pub extern "C" fn loro_new() -> *mut LoroCore {
+    Box::into_raw(Box::new(LoroCore::default()))
+}
+
+/// Release all memory of Loro
+#[no_mangle]
+pub unsafe extern "C" fn loro_free(loro: *mut LoroCore) {
+    if !loro.is_null() {
+        drop(Box::from_raw(loro));
+    }
+}