Add workspace and move bin to bdk-ffi-bindgen package

bdk-ffi-bindgen/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "bdk-ffi-bindgen"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "=1.0.45" # remove after upgrading to next version of uniffi
+structopt = "0.3"
+uniffi_bindgen = "0.16.0"

bdk-ffi-bindgen/src/main.rs

@@ -0,0 +1,136 @@
+use std::fmt;
+use std::path::PathBuf;
+use std::str::FromStr;
+use structopt::StructOpt;
+use uniffi_bindgen;
+
+#[derive(Debug, PartialEq)]
+pub enum Language {
+    KOTLIN,
+    PYTHON,
+    SWIFT,
+}
+
+impl fmt::Display for Language {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Language::KOTLIN => write!(f, "kotlin"),
+            Language::SWIFT => write!(f, "swift"),
+            Language::PYTHON => write!(f, "python"),
+        }
+    }
+}
+
+#[derive(Debug)]
+pub enum Error {
+    UnsupportedLanguage,
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{:?}", self)
+    }
+}
+
+impl FromStr for Language {
+    type Err = Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s {
+            "kotlin" => Ok(Language::KOTLIN),
+            "python" => Ok(Language::PYTHON),
+            "swift" => Ok(Language::SWIFT),
+            _ => Err(Error::UnsupportedLanguage),
+        }
+    }
+}
+
+fn generate_bindings(opt: &Opt) -> anyhow::Result<(), anyhow::Error> {
+    uniffi_bindgen::generate_bindings(
+        &opt.udl_file,
+        None,
+        vec![opt.language.to_string().as_str()],
+        Some(&opt.out_dir),
+        false,
+    )?;
+
+    Ok(())
+}
+
+fn fixup_python_lib_path(
+    out_dir: &PathBuf,
+    lib_name: &PathBuf,
+) -> Result<(), Box<dyn std::error::Error>> {
+    use std::fs;
+    use std::io::Write;
+
+    const LOAD_INDIRECT_DEF: &str = "def loadIndirect():";
+
+    let bindings_file = out_dir.join("bdk.py");
+    let mut data = fs::read_to_string(&bindings_file)?;
+
+    let pos = data.find(LOAD_INDIRECT_DEF).expect(&format!(
+        "loadIndirect not found in `{}`",
+        bindings_file.display()
+    ));
+    let range = pos..pos + LOAD_INDIRECT_DEF.len();
+
+    let replacement = format!(
+        r#"
+def loadIndirect():
+    import glob
+    return getattr(ctypes.cdll, glob.glob(os.path.join(os.path.dirname(os.path.abspath(__file__)), '{}.*'))[0])
+
+def _loadIndirectOld():"#,
+        &lib_name.to_str().expect("lib name")
+    );
+    data.replace_range(range, &replacement);
+
+    let mut file = fs::OpenOptions::new()
+        .write(true)
+        .truncate(true)
+        .open(&bindings_file)?;
+    file.write(data.as_bytes())?;
+
+    Ok(())
+}
+
+#[derive(Debug, StructOpt)]
+#[structopt(
+    name = "bdk-ffi-bindgen",
+    about = "A tool to generate bdk-ffi language bindings"
+)]
+struct Opt {
+    /// UDL file
+    #[structopt(env = "BDKFFI_BINDGEN_UDL", short, long, default_value("src/bdk.udl"), parse(try_from_str = PathBuf::from_str))]
+    udl_file: PathBuf,
+
+    /// Language to generate bindings for
+    #[structopt(env = "BDKFFI_BINDGEN_LANGUAGE", short, long, possible_values(&["kotlin","swift","python"]), parse(try_from_str = Language::from_str))]
+    language: Language,
+
+    /// Output directory to put generated language bindings
+    #[structopt(env = "BDKFFI_BINDGEN_OUTPUT_DIR", short, long, parse(try_from_str = PathBuf::from_str))]
+    out_dir: PathBuf,
+
+    /// Python fix up lib path
+    #[structopt(env = "BDKFFI_BINDGEN_PYTHON_FIXUP_PATH", short, long, parse(try_from_str = PathBuf::from_str))]
+    python_fixup_path: Option<PathBuf>,
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let opt = Opt::from_args();
+
+    println!("Input UDL file is {:?}", opt.udl_file);
+    println!("Chosen language is {}", opt.language);
+    println!("Output directory is {:?}", opt.out_dir);
+
+    generate_bindings(&opt)?;
+
+    if opt.language == Language::PYTHON {
+        if let Some(path) = opt.python_fixup_path {
+            println!("Fixing up python lib path, {:?}", &path);
+            fixup_python_lib_path(&opt.out_dir, &path)?;
+        }
+    }
+    Ok(())
+}