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#![warn(missing_docs)]
#[cfg(feature = "prebuilt-wasm-opt")]
mod prebuilt_wasm_opt;
use anyhow::{anyhow, bail, Context, Result};
use cargo_metadata::{Metadata, MetadataCommand, Package};
use downcast_rs::*;
use fs_extra::dir;
use notify::RecommendedWatcher;
use once_cell::sync::OnceCell;
use std::collections::{HashMap, HashSet};
use std::fs;
use std::io::BufReader;
use std::iter;
use std::iter::FromIterator;
use std::path::{Path, PathBuf};
#[cfg(feature = "dev-server")]
use std::pin::Pin;
use std::process::{Child, ChildStdout, Command, Stdio};
use std::sync::mpsc;
use std::time;
use structopt::StructOpt;
#[cfg(feature = "dev-server")]
use tide::Server;
pub use wasm_run_proc_macro::*;
#[doc(hidden)]
pub use structopt;
const DEFAULT_INDEX: &str = r#"<!DOCTYPE html><html><head><meta charset="utf-8"/><script type="module">import init from "/app.js";init(new URL('app_bg.wasm', import.meta.url));</script></head><body></body></html>"#;
static METADATA: OnceCell<Metadata> = OnceCell::new();
static DEFAULT_BUILD_PATH: OnceCell<PathBuf> = OnceCell::new();
static FRONTEND_PACKAGE: OnceCell<&Package> = OnceCell::new();
static BACKEND_PACKAGE: OnceCell<Option<&Package>> = OnceCell::new();
static HOOKS: OnceCell<Hooks> = OnceCell::new();
#[derive(Debug, PartialEq, Clone, Copy)]
pub enum BuildProfile {
Dev,
Release,
Profiling,
}
#[doc(hidden)]
pub fn wasm_run_init(
pkg_name: &str,
backend_pkg_name: Option<&str>,
default_build_path: Option<Box<dyn FnOnce(&Metadata, &Package) -> PathBuf>>,
hooks: Hooks,
) -> Result<(&'static Metadata, &'static Package)> {
env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
let metadata = MetadataCommand::new()
.exec()
.context("this binary is not meant to be ran outside of its workspace")?;
METADATA
.set(metadata)
.expect("the cell is initially empty; qed");
let metadata = METADATA.get().unwrap();
let frontend_package = METADATA
.get()
.unwrap()
.packages
.iter()
.find(|x| x.name == pkg_name)
.expect("the frontend package existence has been checked during compile time; qed");
FRONTEND_PACKAGE
.set(frontend_package)
.expect("the cell is initially empty; qed");
let frontend_package = FRONTEND_PACKAGE.get().unwrap();
if let Some(name) = backend_pkg_name {
let backend_package = METADATA
.get()
.unwrap()
.packages
.iter()
.find(|x| x.name == name)
.expect("the backend package existence has been checked during compile time; qed");
BACKEND_PACKAGE
.set(Some(backend_package))
.expect("the cell is initially empty; qed");
} else {
BACKEND_PACKAGE
.set(None)
.expect("the cell is initially empty; qed");
}
DEFAULT_BUILD_PATH
.set(if let Some(default_build_path) = default_build_path {
default_build_path(metadata, frontend_package)
} else {
metadata.workspace_root.join("build")
})
.expect("the cell is initially empty; qed");
if HOOKS.set(hooks).is_err() {
panic!("the cell is initially empty; qed");
}
Ok((metadata, frontend_package))
}
#[derive(StructOpt, Debug)]
pub struct DefaultBuildArgs {
#[structopt(long)]
pub build_path: Option<PathBuf>,
#[structopt(long)]
pub profiling: bool,
}
pub trait BuildArgs: Downcast {
fn build_path(&self) -> &PathBuf;
fn default_build_path(&self) -> &PathBuf {
DEFAULT_BUILD_PATH
.get()
.expect("default_build_path has been initialized on startup; qed")
}
fn target_path(&self) -> &PathBuf {
&self.metadata().target_directory
}
fn metadata(&self) -> &Metadata {
METADATA
.get()
.expect("metadata has been initialized on startup; qed")
}
fn frontend_package(&self) -> &Package {
FRONTEND_PACKAGE
.get()
.expect("frontend_package has been initialized on startup; qed")
}
fn backend_package(&self) -> Option<&Package> {
BACKEND_PACKAGE
.get()
.expect("frontend_package has been initialized on startup; qed")
.to_owned()
}
fn profiling(&self) -> bool;
#[cfg(feature = "sass")]
fn build_sass_from_dir(
&self,
input_dir: &std::path::Path,
options: sass_rs::Options,
) -> Result<()> {
use walkdir::{DirEntry, WalkDir};
let build_path = self.build_path();
fn is_sass(entry: &DirEntry) -> bool {
matches!(
entry.path().extension().map(|x| x.to_str()).flatten(),
Some("sass") | Some("scss")
)
}
fn should_ignore(entry: &DirEntry) -> bool {
entry
.file_name()
.to_str()
.map(|x| x.starts_with("_"))
.unwrap_or(false)
}
log::info!("Building SASS from {:?}", input_dir);
let walker = WalkDir::new(&input_dir).into_iter();
for entry in walker
.filter_map(|x| match x {
Ok(x) => Some(x),
Err(err) => {
log::warn!(
"Could not walk into directory `{}`: {}",
input_dir.display(),
err,
);
None
}
})
.filter(|x| x.path().is_file() && is_sass(x) && !should_ignore(x))
{
let file_path = entry.path();
let css_path = build_path
.join(file_path.strip_prefix(&input_dir).unwrap())
.with_extension("css");
match sass_rs::compile_file(file_path, options.clone()) {
Ok(css) => {
let _ = fs::create_dir_all(css_path.parent().unwrap());
fs::write(&css_path, css).with_context(|| {
format!("could not write CSS to file `{}`", css_path.display())
})?;
}
Err(err) => bail!(
"could not convert SASS file `{}` to `{}`: {}",
file_path.display(),
css_path.display(),
err,
),
}
}
Ok(())
}
#[cfg(feature = "sass")]
fn sass_lookup_directories(&self, _profile: BuildProfile) -> Vec<PathBuf> {
const STYLE_CANDIDATES: &[&str] = &["assets", "styles", "css", "sass"];
let package_path = self.frontend_package().manifest_path.parent().unwrap();
STYLE_CANDIDATES
.iter()
.map(|x| package_path.join(x))
.filter(|x| x.exists())
.collect()
}
#[cfg(feature = "sass")]
fn sass_options(&self, profile: BuildProfile) -> sass_rs::Options {
sass_rs::Options {
output_style: match profile {
BuildProfile::Release | BuildProfile::Profiling => sass_rs::OutputStyle::Compressed,
_ => sass_rs::OutputStyle::Nested,
},
..sass_rs::Options::default()
}
}
fn run(self) -> Result<PathBuf>
where
Self: Sized + 'static,
{
let hooks = HOOKS.get().expect("wasm_run_init() has not been called");
build(BuildProfile::Release, &self, hooks)?;
Ok(self.build_path().to_owned())
}
}
impl_downcast!(BuildArgs);
impl BuildArgs for DefaultBuildArgs {
fn build_path(&self) -> &PathBuf {
self.build_path
.as_ref()
.unwrap_or_else(|| self.default_build_path())
}
fn profiling(&self) -> bool {
self.profiling
}
}
#[derive(StructOpt, Debug)]
pub struct DefaultServeArgs {
#[structopt(long)]
pub log: bool,
#[structopt(long, short = "h", default_value = "127.0.0.1")]
pub ip: String,
#[structopt(long, short = "p", default_value = "3000")]
pub port: u16,
#[structopt(flatten)]
pub build_args: DefaultBuildArgs,
}
pub trait ServeArgs: Downcast + Send {
#[cfg(feature = "dev-server")]
fn log(&self) -> bool;
#[cfg(feature = "dev-server")]
fn ip(&self) -> &str;
#[cfg(feature = "dev-server")]
fn port(&self) -> u16;
fn build_args(&self) -> &dyn BuildArgs;
fn run(self) -> Result<()>
where
Self: Sync + Sized + 'static,
{
let hooks = HOOKS.get().expect("wasm_run_init() has not been called");
build(BuildProfile::Dev, self.build_args(), hooks)?;
#[cfg(feature = "dev-server")]
{
async_std::task::block_on(async {
let t1 = async_std::task::spawn(serve_frontend(&self, hooks)?);
let t2 = async_std::task::spawn_blocking(move || watch_frontend(&self, hooks));
futures::try_join!(t1, t2)?;
Err(anyhow!("server and watcher unexpectedly exited"))
})
}
#[cfg(not(feature = "dev-server"))]
{
use std::sync::Arc;
use std::thread;
if self.build_args().backend_package().is_none() {
bail!("missing backend crate name");
}
let args = Arc::new(self);
let t1 = {
let args = Arc::clone(&args);
thread::spawn(move || watch_frontend(&*args, hooks))
};
let t2 = thread::spawn(move || watch_backend(&*args, hooks));
let _ = t1.join();
let _ = t2.join();
Err(anyhow!("server and watcher unexpectedly exited"))
}
}
}
impl_downcast!(ServeArgs);
impl ServeArgs for DefaultServeArgs {
#[cfg(feature = "dev-server")]
fn log(&self) -> bool {
self.log
}
#[cfg(feature = "dev-server")]
fn ip(&self) -> &str {
&self.ip
}
#[cfg(feature = "dev-server")]
fn port(&self) -> u16 {
self.port
}
fn build_args(&self) -> &dyn BuildArgs {
&self.build_args
}
}
pub struct Hooks {
pub pre_build:
Box<dyn Fn(&dyn BuildArgs, BuildProfile, &mut Command) -> Result<()> + Send + Sync>,
#[allow(clippy::type_complexity)]
pub post_build:
Box<dyn Fn(&dyn BuildArgs, BuildProfile, String, Vec<u8>) -> Result<()> + Send + Sync>,
#[cfg(feature = "dev-server")]
#[allow(clippy::type_complexity)]
pub serve: Box<dyn Fn(&dyn ServeArgs, &mut Server<()>) -> Result<()> + Send + Sync>,
pub frontend_watch:
Box<dyn Fn(&dyn ServeArgs, &mut RecommendedWatcher) -> Result<()> + Send + Sync>,
pub backend_watch:
Box<dyn Fn(&dyn ServeArgs, &mut RecommendedWatcher) -> Result<()> + Send + Sync>,
pub backend_command: Box<dyn Fn(&dyn ServeArgs, &mut Command) -> Result<()> + Send + Sync>,
}
impl Default for Hooks {
fn default() -> Self {
Self {
backend_command: Box::new(|args, command| {
command.args(&[
"run",
"-p",
&args
.build_args()
.backend_package()
.context("missing backend crate name")?
.name,
]);
Ok(())
}),
backend_watch: Box::new(|args, watcher| {
use notify::{RecursiveMode, Watcher};
let metadata = args.build_args().metadata();
let backend = args
.build_args()
.backend_package()
.context("missing backend crate name")?;
let packages: HashMap<_, _> = metadata
.packages
.iter()
.map(|x| (x.name.as_str(), x))
.collect();
let members: HashSet<_> = HashSet::from_iter(&metadata.workspace_members);
backend
.dependencies
.iter()
.map(|x| packages.get(x.name.as_str()).unwrap())
.filter(|x| members.contains(&x.id))
.map(|x| x.manifest_path.parent().unwrap())
.chain(iter::once(backend.manifest_path.parent().unwrap()))
.try_for_each(|x| watcher.watch(x, RecursiveMode::Recursive))?;
Ok(())
}),
frontend_watch: Box::new(|args, watcher| {
use notify::{RecursiveMode, Watcher};
let metadata = args.build_args().metadata();
let frontend = args.build_args().frontend_package();
let packages: HashMap<_, _> = metadata
.packages
.iter()
.map(|x| (x.name.as_str(), x))
.collect();
let members: HashSet<_> = HashSet::from_iter(&metadata.workspace_members);
frontend
.dependencies
.iter()
.filter_map(|x| packages.get(x.name.as_str()))
.filter(|x| members.contains(&x.id))
.map(|x| x.manifest_path.parent().unwrap())
.chain(iter::once(frontend.manifest_path.parent().unwrap()))
.try_for_each(|x| watcher.watch(x, RecursiveMode::Recursive))?;
Ok(())
}),
pre_build: Box::new(|_, _, _| Ok(())),
post_build: Box::new(
|args, #[allow(unused_variables)] profile, wasm_js, wasm_bin| {
let build_path = args.build_path();
let wasm_js_path = build_path.join("app.js");
let wasm_bin_path = build_path.join("app_bg.wasm");
fs::write(&wasm_js_path, wasm_js).with_context(|| {
format!("could not write JS file to `{}`", wasm_js_path.display())
})?;
fs::write(&wasm_bin_path, wasm_bin).with_context(|| {
format!("could not write WASM file to `{}`", wasm_bin_path.display())
})?;
let index_path = build_path.join("index.html");
let static_dir = args
.frontend_package()
.manifest_path
.parent()
.unwrap()
.join("static");
if index_path.exists() {
fs::copy("index.html", &index_path).context(format!(
"could not copy index.html to `{}`",
index_path.display()
))?;
} else if static_dir.exists() {
dir::copy(
&static_dir,
&build_path,
&dir::CopyOptions {
content_only: true,
..dir::CopyOptions::new()
},
)
.with_context(|| {
format!(
"could not copy content of directory static: `{}` to `{}`",
static_dir.display(),
build_path.display()
)
})?;
} else {
fs::write(&index_path, DEFAULT_INDEX).with_context(|| {
format!(
"could not write default index.html to `{}`",
index_path.display()
)
})?;
}
#[cfg(feature = "sass")]
{
let options = args.sass_options(profile);
for style_path in args.sass_lookup_directories(profile) {
args.build_sass_from_dir(&style_path, options.clone())?;
}
}
Ok(())
},
),
#[cfg(feature = "dev-server")]
serve: Box::new(|args, server| {
use tide::{Body, Request, Response};
let build_path = args.build_args().build_path().to_owned();
let index_path = build_path.join("index.html");
server.at("/").serve_dir(args.build_args().build_path())?;
server.at("/").get(move |_| {
let index_path = index_path.clone();
async move { Ok(Response::from(Body::from_file(index_path).await?)) }
});
server.at("/*path").get(move |req: Request<()>| {
let build_path = build_path.clone();
async move {
match Body::from_file(build_path.join(req.param("path").unwrap())).await {
Ok(body) => Ok(Response::from(body)),
Err(_) => Ok(Response::from(
Body::from_file(build_path.join("index.html")).await?,
)),
}
}
});
Ok(())
}),
}
}
}
fn build(mut profile: BuildProfile, args: &dyn BuildArgs, hooks: &Hooks) -> Result<()> {
use wasm_bindgen_cli_support::Bindgen;
if args.profiling() {
profile = BuildProfile::Profiling;
}
let frontend_package = args.frontend_package();
let build_path = args.build_path();
let _ = fs::remove_dir_all(build_path);
fs::create_dir_all(build_path).with_context(|| {
format!(
"could not create build directory `{}`",
build_path.display()
)
})?;
let mut command = Command::new("cargo");
command
.args(&[
"build",
"--lib",
"--target",
"wasm32-unknown-unknown",
"--manifest-path",
])
.arg(&frontend_package.manifest_path)
.args(match profile {
BuildProfile::Profiling => &["--release"] as &[&str],
BuildProfile::Release => &["--release"],
BuildProfile::Dev => &[],
});
log::info!("Running pre-build hook");
(hooks.pre_build)(args, profile, &mut command)?;
log::info!("Building frontend");
let status = command.status().context("could not start build process")?;
if !status.success() {
if let Some(code) = status.code() {
bail!("build process exit with code {}", code);
} else {
bail!("build process has been terminated by a signal");
}
}
let wasm_path = args
.target_path()
.join("wasm32-unknown-unknown")
.join(match profile {
BuildProfile::Profiling => "release",
BuildProfile::Release => "release",
BuildProfile::Dev => "debug",
})
.join(frontend_package.name.replace("-", "_"))
.with_extension("wasm");
let mut output = Bindgen::new()
.input_path(wasm_path)
.out_name("app")
.web(true)
.expect("fails only if multiple modes specified; qed")
.debug(!matches!(profile, BuildProfile::Release))
.generate_output()
.context("could not generate WASM bindgen file")?;
let wasm_js = output.js().to_owned();
let wasm_bin = output.wasm_mut().emit_wasm();
let wasm_bin = match profile {
BuildProfile::Profiling => wasm_opt(wasm_bin, 0, 2, true, args.target_path())?,
BuildProfile::Release => wasm_opt(wasm_bin, 1, 2, false, args.target_path())?,
BuildProfile::Dev => wasm_bin,
};
log::info!("Running post-build hook");
(hooks.post_build)(args, profile, wasm_js, wasm_bin)?;
Ok(())
}
#[cfg(feature = "dev-server")]
fn serve_frontend(
args: &dyn ServeArgs,
hooks: &Hooks,
) -> Result<Pin<Box<impl std::future::Future<Output = Result<()>> + Send + 'static>>> {
use futures::TryFutureExt;
if args.log() {
tide::log::start();
}
let mut app = tide::new();
(hooks.serve)(args, &mut app)?;
log::info!(
"Development server started: http://{}:{}",
args.ip(),
args.port()
);
Ok(Box::pin(
app.listen(format!("{}:{}", args.ip(), args.port()))
.map_err(Into::into),
))
}
#[cfg(not(feature = "dev-server"))]
fn watch_backend(args: &dyn ServeArgs, hooks: &Hooks) -> Result<()> {
let (tx, rx) = mpsc::channel();
let mut watcher: RecommendedWatcher = notify::Watcher::new(tx, time::Duration::from_secs(2))
.context("could not initialize watcher")?;
(hooks.backend_watch)(args, &mut watcher)?;
struct BackgroundProcess(std::process::Child);
impl Drop for BackgroundProcess {
fn drop(&mut self) {
let _ = self.0.kill();
let _ = self.0.wait();
}
}
let run_server = || -> Result<BackgroundProcess> {
let mut command = Command::new("cargo");
(hooks.backend_command)(args, &mut command)?;
Ok(command.spawn().map(BackgroundProcess)?)
};
let mut process_guard = Some(run_server()?);
watch_loop(args, rx, || {
drop(process_guard.take());
process_guard.replace(run_server()?);
Ok(())
});
}
fn watch_frontend(args: &dyn ServeArgs, hooks: &Hooks) -> Result<()> {
let (tx, rx) = mpsc::channel();
let mut watcher: RecommendedWatcher = notify::Watcher::new(tx, time::Duration::from_secs(2))
.context("could not initialize watcher")?;
(hooks.frontend_watch)(args, &mut watcher)?;
let build_args = args.build_args();
watch_loop(args, rx, || build(BuildProfile::Dev, build_args, hooks));
}
fn watch_loop(
args: &dyn ServeArgs,
rx: mpsc::Receiver<notify::DebouncedEvent>,
mut callback: impl FnMut() -> Result<()>,
) -> ! {
loop {
use notify::DebouncedEvent::*;
let message = rx.recv();
match &message {
Ok(Create(path)) | Ok(Write(path)) | Ok(Remove(path)) | Ok(Rename(_, path))
if !path.starts_with(args.build_args().build_path())
&& !path.starts_with(args.build_args().target_path())
&& !path
.file_name()
.and_then(|x| x.to_str())
.map(|x| x.starts_with('.'))
.unwrap_or(false) =>
{
if let Err(err) = callback() {
log::error!("{}", err);
}
}
Ok(_) => {}
Err(e) => log::error!("Watch error: {}", e),
}
}
}
#[allow(unused_variables, unreachable_code)]
fn wasm_opt(
binary: Vec<u8>,
shrink_level: u32,
optimization_level: u32,
debug_info: bool,
target_path: impl AsRef<Path>,
) -> Result<Vec<u8>> {
#[cfg(feature = "binaryen")]
return match binaryen::Module::read(&binary) {
Ok(mut module) => {
module.optimize(&binaryen::CodegenConfig {
shrink_level,
optimization_level,
debug_info,
});
Ok(module.write())
}
Err(()) => bail!("could not load WASM module"),
};
#[cfg(feature = "prebuilt-wasm-opt")]
return {
let wasm_opt = prebuilt_wasm_opt::install_wasm_opt(target_path)?;
let mut command = Command::new(&wasm_opt);
command
.stderr(Stdio::inherit())
.args(&["-o", "-", "-O"])
.args(&["-ol", &optimization_level.to_string()])
.args(&["-s", &shrink_level.to_string()]);
if debug_info {
command.arg("-g");
}
#[cfg(target_os = "macos")]
{
command.env("DYLD_LIBRARY_PATH", wasm_opt.parent().unwrap());
}
#[cfg(windows)]
let delete_guard = {
use std::io::Write;
let tmp = tempfile::NamedTempFile::new()?;
tmp.as_file().write_all(&binary)?;
command.arg(tmp.path());
tmp
};
#[cfg(unix)]
{
use std::io::{Seek, SeekFrom, Write};
let mut file = tempfile::tempfile()?;
file.write_all(&binary)?;
file.seek(SeekFrom::Start(0))?;
command.stdin(file);
}
let output = command.output()?;
if !output.status.success() {
bail!("command `wasm-opt` failed.");
}
Ok(output.stdout)
};
log::warn!("No optimization has been done on the WASM");
Ok(binary)
}
pub trait PackageExt {
fn cargo(&self, builder: impl FnOnce(&mut Command)) -> Result<CargoChild>;
}
impl PackageExt for Package {
fn cargo(&self, builder: impl FnOnce(&mut Command)) -> Result<CargoChild> {
let mut command = Command::new("cargo");
command
.current_dir(self.manifest_path.parent().unwrap())
.stdout(Stdio::piped());
builder(&mut command);
Ok(CargoChild(command.spawn()?))
}
}
impl PackageExt for Metadata {
fn cargo(&self, builder: impl FnOnce(&mut Command)) -> Result<CargoChild> {
let mut command = Command::new("cargo");
command
.current_dir(&self.workspace_root)
.stdout(Stdio::piped());
builder(&mut command);
Ok(CargoChild(command.spawn()?))
}
}
pub struct CargoChild(Child);
impl CargoChild {
pub fn wait_success(&mut self) -> Result<()> {
let status = self.0.wait()?;
if let Some(code) = status.code() {
if !status.success() {
bail!("cargo exited with status: {}", code)
}
}
if !status.success() {
bail!("cargo exited with error")
}
Ok(())
}
pub fn iter(&mut self) -> cargo_metadata::MessageIter<BufReader<ChildStdout>> {
let reader = BufReader::new(self.0.stdout.take().unwrap());
cargo_metadata::Message::parse_stream(reader)
}
}
impl Drop for CargoChild {
fn drop(&mut self) {
let _ = self.0.kill();
let _ = self.0.wait();
}
}
pub mod prelude {
pub use wasm_run_proc_macro::*;
pub use anyhow;
#[cfg(feature = "dev-server")]
pub use async_std;
pub use cargo_metadata;
pub use cargo_metadata::{Message, Metadata, Package};
pub use fs_extra;
#[cfg(feature = "dev-server")]
pub use futures;
pub use notify;
pub use notify::RecommendedWatcher;
#[cfg(feature = "sass")]
pub use sass_rs;
#[cfg(feature = "dev-server")]
pub use tide;
#[cfg(feature = "dev-server")]
pub use tide::Server;
pub use super::{
BuildArgs, BuildProfile, CargoChild, DefaultBuildArgs, DefaultServeArgs, Hooks, PackageExt,
ServeArgs,
};
}