From ce1a946e8599df2fb573774f4e7f6df267840be9 Mon Sep 17 00:00:00 2001 From: Stefan Junker Date: Wed, 4 Sep 2019 12:32:00 +0200 Subject: [PATCH] [WIP]: initial custom WASI demo This demo is the trivial approach to implementing a custom WASI. It contains a copy of the wasmtime-wasi implementation, which is rather a short-term solution and not sustainable any longer than a few iterations. As a demo customization, it redirects all output from fd=2 (stderr) to fd=1 (stdout). --- wasmtime-wasi-custom/Cargo.lock | 1457 ++++++++++++++++++++++++++++++ wasmtime-wasi-custom/Cargo.toml | 22 + wasmtime-wasi-custom/README.md | 56 ++ wasmtime-wasi-custom/build.rs | 35 + wasmtime-wasi-custom/src/app.c | 3 + wasmtime-wasi-custom/src/app.rs | 7 + wasmtime-wasi-custom/src/main.rs | 93 ++ 7 files changed, 1673 insertions(+) create mode 100644 wasmtime-wasi-custom/Cargo.lock create mode 100644 wasmtime-wasi-custom/Cargo.toml create mode 100644 wasmtime-wasi-custom/README.md create mode 100644 wasmtime-wasi-custom/build.rs create mode 100644 wasmtime-wasi-custom/src/app.c create mode 100644 wasmtime-wasi-custom/src/app.rs create mode 100644 wasmtime-wasi-custom/src/main.rs diff --git a/wasmtime-wasi-custom/Cargo.lock b/wasmtime-wasi-custom/Cargo.lock new file mode 100644 index 0000000..0c12655 --- /dev/null +++ b/wasmtime-wasi-custom/Cargo.lock @@ -0,0 +1,1457 @@ +# This file is 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b/wasmtime-wasi-custom/Cargo.toml new file mode 100644 index 0000000..d4817eb --- /dev/null +++ b/wasmtime-wasi-custom/Cargo.toml @@ -0,0 +1,22 @@ +[package] +name = "wasmtime-wasi-custom" +version = "0.1.0" +authors = ["Stefan Junker "] +edition = "2018" +build = "build.rs" + +[dependencies] +wasmtime-api = { git = "https://github.com/CraneStation/wasmtime", package = "wasmtime-api", rev = "9c747db4293192dffe659ed741070716caeb43b0" } +wasmtime-jit = { git = "https://github.com/CraneStation/wasmtime", package = "wasmtime-jit", rev = "9c747db4293192dffe659ed741070716caeb43b0" } +wasmtime-interface-types = { git = "https://github.com/CraneStation/wasmtime", package = "wasmtime-interface-types", rev = "9c747db4293192dffe659ed741070716caeb43b0" } +# A copy of wasmtime-wasi at v0.3.0 made for customisation purposes +wasmtime-wasi = { git = "https://github.com/enarx/enarx-wasi-prototype", rev ="2ff5c5630488bedb956021da775f2b979307d41d" } + +log = "0.4" +env_logger = "0.6" + +[features] +default = ["rust"] + +c = [] +rust = [] diff --git a/wasmtime-wasi-custom/README.md b/wasmtime-wasi-custom/README.md new file mode 100644 index 0000000..29919ec --- /dev/null +++ b/wasmtime-wasi-custom/README.md @@ -0,0 +1,56 @@ +# Wasmtime Custom WASI Demo +This is an example crate demonstrating how Enarx may use Wasmtime, a Rust-powered JIT, to natively run programs from several different source languages (Rust/C/C++) compiled to WASI-compliant WASM. + +## Running the demo + +By default, the Rust demo should run with `cargo run` out of the box. + +If you wish to compile the C demo, you'll need to install `lld` . On Fedora, this can be accomplished with `sudo dnf install lld`. + +### Switching Languages + +The WASM binary used for the demo can be compiled from either Rust or C. Compilation of this binary happens at build time, and the source language can be controlled via Cargo features. + +Rust is compiled by default. If C is desired, the appropriate feature can be invoked via the `cargo` command: + +``` +cargo run --no-default-features --features c +``` + +Or, alternatively, by changing the `default` feature in `Cargo.toml` from `["rust"]` to `["c"]`. + +## Changelog +This demo is expected to evolve over time. + +### v0.1.0 +Customizes `fd_write` so that all writes to fd=2 (stdin) are redirected to fd=1 (stdout). +Uses an in-tree copy of `wasmtime-wasi` with customizations to the glue code. + +Example run: + +```log +$ RUST_LOG=wasmtime_wasi=trace cargo run + Compiling wasmtime-wasi-custom v0.1.0 (/home/steveej/src/job-redhat/enarx/github_enarx_demo/wasmtime-wasi-custom) + Finished dev [unoptimized + debuginfo] target(s) in 4.80s + Running `target/debug/wasmtime-wasi-custom` +[2019-09-19T17:31:42Z INFO wasmtime_wasi_custom] WASM appliation binary has been compiled from Rust. +[2019-09-19T17:31:42Z INFO wasmtime_wasi_custom] Loading WASM application binary... +[2019-09-19T17:31:42Z INFO wasmtime_wasi_custom] WASM application binary loaded. +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: fd_prestat_get/wasi_unstable +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: fd_prestat_dir_name/wasi_unstable +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: environ_sizes_get/wasi_unstable +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: environ_get/wasi_unstable +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: args_sizes_get/wasi_unstable +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: args_get/wasi_unstable +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: fd_write/wasi_unstable +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: proc_exit/wasi_unstable +[2019-09-19T17:31:42Z TRACE wasmtime_wasi_custom] found export: fd_fdstat_get/wasi_unstable +[2019-09-19T17:31:46Z TRACE wasmtime_wasi::syscalls] fd_prestat_get(fd=3, buf=0xffff0) +[2019-09-19T17:31:46Z TRACE wasmtime_wasi::syscalls] environ_sizes_get(environ_count=0xffff0, environ_buf_size=0xffffc) +[2019-09-19T17:31:46Z TRACE wasmtime_wasi::syscalls] args_sizes_get(argc=0xffffc, argv_buf_size=0xffff0) +[2019-09-19T17:31:46Z TRACE wasmtime_wasi::syscalls] fd_write(fd=1, iovs=0xffeb0, iovs_len=1, nwritten=0xffeb8) +Hello, world! +[2019-09-19T17:31:46Z TRACE wasmtime_wasi::syscalls] fd_write(fd=2, iovs=0xffed0, iovs_len=1, nwritten=0xffedc) +[2019-09-19T17:31:46Z DEBUG wasmtime_wasi::syscalls] redirecting stderr to stdout +Hello, stderr! +``` \ No newline at end of file diff --git a/wasmtime-wasi-custom/build.rs b/wasmtime-wasi-custom/build.rs new file mode 100644 index 0000000..1d20e8a --- /dev/null +++ b/wasmtime-wasi-custom/build.rs @@ -0,0 +1,35 @@ +use std::process::Command; + +fn main() { + let out = std::env::var("OUT_DIR").unwrap(); + + if cfg!(feature = "c") { + println!("Compiling C app to WASM..."); + let cc = std::env::var("CC").unwrap_or("clang".to_owned()); + assert!(Command::new(cc) + .args(&["-o", &format!("{}/app.wasm", out)]) + .arg("--target=wasm32-unknown-wasi") + .arg("-Wl,--export-all") + .arg("-Wl,--no-entry") + .arg("-nostdlib") + .arg("-O3") + .arg("src/app.c") + .status() + .expect("failed to compile WASM module") + .success()); + } + + if cfg!(feature = "rust") { + println!("Compiling Rust app to WASM..."); + assert!(Command::new("rustc") + // .args(&["-C", "lto"]) + // .args(&["-C", "opt-level=3"]) + // .args(&["--target", "wasm32-unknown-unknown"]) + .args(&["--target", "wasm32-wasi"]) + .args(&["-o", &format!("{}/app.wasm", out)]) + .arg("src/app.rs") + .status() + .expect("failed to compile WASM module") + .success()); + } +} diff --git a/wasmtime-wasi-custom/src/app.c b/wasmtime-wasi-custom/src/app.c new file mode 100644 index 0000000..857265d --- /dev/null +++ b/wasmtime-wasi-custom/src/app.c @@ -0,0 +1,3 @@ +int add(int l, int r) { + return l + r; +} \ No newline at end of file diff --git a/wasmtime-wasi-custom/src/app.rs b/wasmtime-wasi-custom/src/app.rs new file mode 100644 index 0000000..565009d --- /dev/null +++ b/wasmtime-wasi-custom/src/app.rs @@ -0,0 +1,7 @@ +fn main() {} + +#[no_mangle] +pub extern fn hello_world() { + println!("Hello, world!"); + eprintln!("Hello, stderr!"); +} \ No newline at end of file diff --git a/wasmtime-wasi-custom/src/main.rs b/wasmtime-wasi-custom/src/main.rs new file mode 100644 index 0000000..e318105 --- /dev/null +++ b/wasmtime-wasi-custom/src/main.rs @@ -0,0 +1,93 @@ +use log::{info, trace}; +use std::collections::HashMap; +use std::error::Error; +use std::fs::read; +use wasmtime_api; + +fn main() -> Result<(), Box> { + let _ = env_logger::try_init_from_env(env_logger::Env::default()); + + // Before we begin, it'll be heplful to know which source language we're + // running, so let's print it out. + if cfg!(feature = "c") { + info!("WASM application binary has been compiled from C."); + } + if cfg!(feature = "rust") { + info!("WASM appliation binary has been compiled from Rust."); + } + + // Load and instnatiate the WASM app + info!("Loading WASM application binary..."); + let app_wasm = read(concat!(env!("OUT_DIR"), "/app.wasm")).unwrap(); + info!("WASM application binary loaded."); + + // wasmtime-api variables + let engine = wasmtime_api::HostRef::new(wasmtime_api::Engine::default()); + let store = wasmtime_api::HostRef::new(wasmtime_api::Store::new(engine)); + let mut module_registry: HashMap)> = + HashMap::new(); + + // Instantiate WASI + let custom_wasi = wasmtime_wasi::instantiate_wasi( + // prefix: &str, + "", + // global_exports: Rc>>>, + store.borrow().global_exports().clone(), + // preopened_dirs: &[(String, File)], + Default::default(), + // argv: &[String], + Default::default(), + // environ: &[(String, String)], + Default::default(), + ) + .expect("could nt instantiate WASI"); + module_registry.insert( + "wasi_unstable".to_string(), + wasmtime_api::Instance::from_handle(store.clone(), custom_wasi)?, + ); + + let app_module = wasmtime_api::HostRef::new(wasmtime_api::Module::new(store.clone(), &app_wasm)?); + + // Resolve import using module_registry. + let imports = { + // let module_borrow: std::cell::Ref<'_, wasmtime_api::Module> = app_module.borrow(); + + app_module + .borrow() + .imports() + .iter() + .map(|i| { + let module_name = i.module().to_string(); + if let Some((instance, map)) = module_registry.get(&module_name) { + let field_name = i.name().to_string(); + if let Some(export_index) = map.get(&field_name) { + trace!("found export: {}/{}", field_name, module_name); + Ok(instance.exports()[*export_index].clone()) + } else { + Err(format!( + "Import {} was not found in module {}", + field_name, module_name + )) + } + } else { + Err(format!("Import module {} was not found", module_name)) + } + }) + .collect::, _>>()? + }; + + let instance = wasmtime_api::HostRef::new(wasmtime_api::Instance::new( + store.clone(), + app_module.clone(), + &imports, + )?); + + let mut handle = instance.borrow().handle().clone(); + let mut context = store.borrow().engine().borrow().create_wasmtime_context(); + let module_data = wasmtime_interface_types::ModuleData::new(&app_wasm)?; + + // Invoke the function + module_data.invoke(&mut context, &mut handle, "hello_world", Default::default())?; + + Ok(()) +}