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build.rs
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build.rs
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extern crate bindgen;
use std::fs;
use std::env;
use std::fmt::Debug;
use std::io::Read;
use std::io::Write;
use std::path::{Path, PathBuf};
use std::time::Instant;
use flate2::read::GzDecoder;
use const_format::formatcp;
const TF_VER: &str = "2.14.0";
const TAG: &str = formatcp!("v{TF_VER}");
const TF_GIT_URL: &str = "https://github.com/tensorflow/tensorflow.git";
const ANDROID_BIN_DOWNLOAD_URL: &str = formatcp!(
"https://repo1.maven.org/maven2/org/tensorflow/tensorflow-lite/{TF_VER}/tensorflow-lite-{TF_VER}.aar"
);
const ANDROID_BIN_FLEX_DOWNLOAD_URL: &str = formatcp!(
"https://repo1.maven.org/maven2/org/tensorflow/tensorflow-lite-select-tf-ops/{TF_VER}/tensorflow-lite-select-tf-ops-{TF_VER}.aar"
);
// Download URL for the iOS cannot be constucted dynamically and should be replaced manually
// with a new release of TFLite
const IOS_BIN_DOWNLOAD_URL: &str = formatcp!(
"https://dl.google.com/tflite-nightly/ios/prod/tensorflow/lite/release/ios/nightly/807/20230224-035015/TensorFlowLiteC/0.0.1-nightly.20230224/TensorFlowLiteC-0.0.1-nightly.20230224.tar.gz"
);
const RELEASE_URL: &str = "https://github.com/rebotics/tflitec-rs/releases/download/v0.1";
fn target_os() -> String {
env::var("CARGO_CFG_TARGET_OS").expect("Unable to get TARGET_OS")
}
fn dll_extension() -> &'static str {
match target_os().as_str() {
"macos" => "dylib",
"windows" => "dll",
_ => "so",
}
}
fn dll_prefix() -> &'static str {
match target_os().as_str() {
"windows" => "",
_ => "lib",
}
}
fn copy_or_overwrite<P: AsRef<Path> + Debug, Q: AsRef<Path> + Debug>(src: P, dest: Q) {
let src_path: &Path = src.as_ref();
let dest_path: &Path = dest.as_ref();
if dest_path.exists() {
if dest_path.is_file() {
std::fs::remove_file(dest_path).expect("Cannot remove file");
} else {
std::fs::remove_dir_all(dest_path).expect("Cannot remove directory");
}
}
if src_path.is_dir() {
let options = fs_extra::dir::CopyOptions {
copy_inside: true,
..fs_extra::dir::CopyOptions::new()
};
fs_extra::dir::copy(src_path, dest_path, &options).unwrap_or_else(|e| {
panic!(
"Cannot copy directory from {:?} to {:?}. Error: {}",
src, dest, e
)
});
} else {
std::fs::copy(src_path, dest_path).unwrap_or_else(|e| {
panic!(
"Cannot copy file from {:?} to {:?}. Error: {}",
src, dest, e
)
});
}
}
fn prepare_tensorflow_source(tf_src_path: &Path) {
let complete_clone_hint_file = tf_src_path.join(".complete_clone");
if !complete_clone_hint_file.exists() {
if tf_src_path.exists() {
std::fs::remove_dir_all(tf_src_path).expect("Cannot clean tf_src_path");
}
let mut git = std::process::Command::new("git");
git.arg("clone")
.args(["--depth", "1"])
.arg("--shallow-submodules")
.args(["--branch", TAG])
.arg("--single-branch")
.arg(TF_GIT_URL)
.arg(tf_src_path.to_str().unwrap());
println!("Git clone started");
let start = Instant::now();
if !git.status().expect("Cannot execute `git clone`").success() {
panic!("git clone failed");
}
std::fs::File::create(complete_clone_hint_file).expect("Cannot create clone hint file!");
println!("Clone took {:?}", Instant::now() - start);
}
}
fn get_lib_name() -> String {
let ext = dll_extension();
let lib_prefix = dll_prefix();
match target_os().as_str() {
"android" => {
format!("{}tensorflowlite_jni.{}", lib_prefix, ext)
},
"ios" => {
String::from("TensorFlowLiteC.framework")
},
_ => {
format!("{}tensorflowlite_c.{}", lib_prefix, ext)
}
}
}
fn get_flex_name() -> String {
let ext = dll_extension();
let lib_prefix = dll_prefix();
match target_os().as_str() {
"android" => {
format!("{}tensorflowlite_flex_jni.{}", lib_prefix, ext)
},
"ios" => {
String::from("TensorFlowLiteSelectTfOps.framework")
}
_ => {
format!("{}tensorflowlite_flex.{}", lib_prefix, ext)
}
}
}
fn lib_output_path() -> PathBuf {
out_dir().join(get_lib_name())
}
fn flex_output_path() -> PathBuf {
out_dir().join(get_flex_name())
}
fn out_dir() -> PathBuf {
PathBuf::from(env::var("OUT_DIR").unwrap())
}
fn prepare_for_docsrs() {
// Docs.rs cannot access to network, use resource files
let library_path = out_dir().join("libtensorflowlite_c.so");
let bindings_path = out_dir().join("bindings.rs");
let mut unzip = std::process::Command::new("unzip");
let root = std::path::PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
unzip
.arg(root.join("build-res/docsrs_res.zip"))
.arg("-d")
.arg(out_dir());
if !(unzip
.status()
.unwrap_or_else(|_| panic!("Cannot execute unzip"))
.success()
&& library_path.exists()
&& bindings_path.exists())
{
panic!("Cannot extract docs.rs resources")
}
}
fn generate_binding_ios() {
let mut builder = bindgen::Builder::default();
let headers_path = out_dir().join("TensorFlowLiteC.framework/Headers");
let header_path = headers_path.join("c_api.h");
builder = builder.header(
header_path.to_str().unwrap()
);
if cfg!(feature = "xnnpack") {
let header_path = headers_path.join("xnnpack_delegate.h");
builder = builder.header(
header_path.to_str().unwrap()
);
}
let bindings = builder
.clang_arg(format!("-I{}", headers_path.to_str().unwrap()))
// Tell cargo to invalidate the built crate whenever any of the
// included header files changed.
.parse_callbacks(Box::new(bindgen::CargoCallbacks))
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
// Write the bindings to the $OUT_DIR/bindings.rs file.
bindings
.write_to_file(out_dir().join("bindings.rs"))
.expect("Couldn't write bindings!");
}
fn generate_bindings(tf_src_path: PathBuf) {
let mut builder = bindgen::Builder::default().header(
tf_src_path
.join("tensorflow/lite/c/c_api.h")
.to_str()
.unwrap(),
);
if cfg!(feature = "xnnpack") {
builder = builder.header(
tf_src_path
.join("tensorflow/lite/delegates/xnnpack/xnnpack_delegate.h")
.to_str()
.unwrap(),
);
}
let bindings = builder
.clang_arg(format!("-I{}", tf_src_path.to_str().unwrap()))
// Tell cargo to invalidate the built crate whenever any of the
// included header files changed.
.parse_callbacks(Box::new(bindgen::CargoCallbacks))
// Finish the builder and generate the bindings.
.generate()
// Unwrap the Result and panic on failure.
.expect("Unable to generate bindings");
// Write the bindings to the $OUT_DIR/bindings.rs file.
bindings
.write_to_file(out_dir().join("bindings.rs"))
.expect("Couldn't write bindings!");
}
fn download_ios(
url: &str,
save_path: &Path,
filename: &str,
) {
let framework_name = filename.split('.').next().unwrap();
let archive_path = save_path.join(format!("{framework_name}.tar.gz"));
println!("Starting to download archive with {}...", filename);
let start = Instant::now();
download_file(url, &archive_path);
println!(
"Finished downloading archive with {}, took: {:?}",
filename,
Instant::now() - start,
);
let arch = env::var("CARGO_CFG_TARGET_ARCH").expect("Unable to get TARGET_ARCH");
let arch = match arch.as_str() {
"aarch64" => "ios-arm64".to_string(),
_ => panic!("'{}' not supported", arch),
};
let file = fs::File::open(archive_path).unwrap();
let decompressed = GzDecoder::new(file);
let mut archive = tar::Archive::new(decompressed);
let arhive_filepath = format!(
"Frameworks/{framework_name}.xcframework/{arch}/{filename}/"
);
archive.entries().unwrap().for_each(|entry| {
let mut file = entry.unwrap();
let file_path = file.path().unwrap();
let file_path = file_path.to_str().unwrap();
if file_path.contains(&arhive_filepath) {
let file_path = file_path.split("/").skip(4).collect::<Vec<_>>().join("/");
file.unpack(save_path.join(file_path)).unwrap();
}
});
}
fn download_android(
url: &str,
save_path: &Path,
filename: &str,
) {
let aar_path = save_path.join("android_lib");
println!("Starting to download archive with {}...", filename);
let start = Instant::now();
download_file(url, &aar_path);
println!(
"Finished downloading archive with {}, took: {:?}",
filename,
Instant::now() - start,
);
let file = fs::File::open(aar_path).unwrap();
let arch = env::var("CARGO_CFG_TARGET_ARCH").expect("Unable to get TARGET_ARCH");
let arch = match arch.as_str() {
"aarch64" => "arm64-v8a".to_string(),
"armv7" | "arm" => "armeabi-v7a".to_string(),
"x86" => arch,
"x86_64" => arch,
_ => panic!("'{}' not supported", arch),
};
let mut archive = zip::ZipArchive::new(file).unwrap();
let archive_file_path = format!("jni/{}/{}", arch, filename);
let mut archive_file = archive.by_name(&archive_file_path).expect(
"No file found in the AAR"
);
let mut buff: Vec<u8> = vec![];
archive_file.read_to_end(&mut buff).unwrap();
let file_path = save_path.join(filename);
let mut file = fs::File::create(file_path).unwrap();
file.write_all(&buff).unwrap();
}
fn download_and_install(tf_src_path: &Path) {
// Copy prebuilt libraries to given path
{
let libname = get_lib_name();
let flexname = get_flex_name();
let save_path = tf_src_path.join("pkgs");
std::fs::create_dir_all(&save_path).unwrap();
match target_os().as_str() {
"android" => {
download_android(ANDROID_BIN_DOWNLOAD_URL, &save_path, &libname);
#[cfg(feature = "flex_delegate")]
download_android(ANDROID_BIN_FLEX_DOWNLOAD_URL, &save_path, &flexname);
},
"ios" => {
download_ios(IOS_BIN_DOWNLOAD_URL, &save_path, &libname);
},
_ => {
let arch = env::var("CARGO_CFG_TARGET_ARCH").expect("Unable to get TARGET_ARCH");
let lib_url = format!(
"{}/{}_{}_{}", RELEASE_URL, target_os(), arch, &libname
);
println!("{}", &lib_url);
println!("{:?}", &save_path.join(&libname));
download_file(&lib_url, &save_path.join(&libname));
#[cfg(feature = "flex_delegate")] {
let flex_url = format!(
"{}/{}_{}_{}", RELEASE_URL, target_os(), arch, &flexname
);
println!("{}", &flex_url);
download_file(&flex_url, &save_path.join(&flexname));
}
}
};
let lib_src_path = PathBuf::from(&save_path).join(&libname);
let lib_output_path = lib_output_path();
copy_or_overwrite(lib_src_path, lib_output_path);
#[cfg(feature = "flex_delegate")] {
if target_os() != "ios" {
let flex_src_path = PathBuf::from(&save_path).join(&flexname);
let flex_output_path = flex_output_path();
copy_or_overwrite(flex_src_path, flex_output_path);
}
}
}
}
fn download_file(url: &str, path: &Path) {
let mut easy = curl::easy::Easy::new();
let output_file = std::fs::File::create(path).unwrap();
let mut writer = std::io::BufWriter::new(output_file);
easy.url(url).unwrap();
easy.follow_location(true).unwrap();
easy.write_function(move |data| Ok(writer.write(data).unwrap()))
.unwrap();
easy.perform().unwrap_or_else(|e| {
std::fs::remove_file(path).unwrap(); // Delete corrupted or empty file
panic!("Error occurred while downloading from {}: {:?}", url, e);
});
}
fn main() {
let out_path = out_dir();
let os = target_os();
match os.as_str() {
"android" => {
println!("cargo:rustc-link-search=native={}", out_path.display());
println!("cargo:rustc-link-lib=dylib=tensorflowlite_jni");
}
"ios" => {
println!("cargo:rustc-link-search=framework={}", out_path.display());
println!("cargo:rustc-link-lib=framework=TensorFlowLiteC");
println!("cargo:rustc-link-lib=c++");
}
_ => {
println!("cargo:rustc-link-search=native={}", out_path.display());
println!("cargo:rustc-link-lib=dylib=tensorflowlite_c");
#[cfg(feature = "flex_delegate")]
println!("cargo:rustc-link-lib=dylib=tensorflowlite_flex");
}
}
if env::var("DOCS_RS") == Ok(String::from("1")) {
// docs.rs cannot access to network, use resource files
prepare_for_docsrs();
} else {
let tf_src_path = out_path.join(format!("tensorflow_{}", TAG));
if os != "ios" {
prepare_tensorflow_source(tf_src_path.as_path());
download_and_install(&tf_src_path);
generate_bindings(tf_src_path);
} else {
download_and_install(&tf_src_path);
generate_binding_ios();
}
}
}