Merge pull request #20 from nipzu/master

Added support for wasm32-unknown-wasi

Author: dhardy

.travis.yml

@@ -60,10 +60,11 @@ matrix:
         - cargo test
 
     - rust: nightly
-      env: DESCRIPTION="WASM via emscripten, stdweb and wasm-bindgen"
+      env: DESCRIPTION="WASM via emscripten, stdweb, wasm-bindgen and WASI"
       install:
         - rustup target add wasm32-unknown-unknown
         - rustup target add wasm32-unknown-emscripten
+        - rustup target add wasm32-unknown-wasi
         - nvm install 9
         - ./utils/ci/install_cargo_web.sh
         - cargo web prepare-emscripten
@@ -80,6 +81,7 @@ matrix:
         #- cargo web test --target wasm32-unknown-emscripten
         #- cargo web test --nodejs --target wasm32-unknown-emscripten
         #- cargo build --target wasm32-unknown-unknown # without any features
+        - cargo build --target wasm32-unknown-wasi
         - cargo build --target wasm32-unknown-unknown --features=wasm-bindgen
         - cargo web test --target wasm32-unknown-unknown --features=stdweb
         - cargo build --manifest-path tests/wasm_bindgen/Cargo.toml --target wasm32-unknown-unknown

CHANGELOG.md

@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 
+## [0.1.2] - 2019-04-06
+- Add support for `wasm32-unknown-wasi` target.
+
 ## [0.1.1] - 2019-04-05
 - Enable std functionality for CloudABI by default.
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "getrandom"
-version = "0.1.1"
+version = "0.1.2"
 edition = "2018"
 authors = ["The Rand Project Developers"]
 license = "MIT OR Apache-2.0"
@@ -36,5 +36,8 @@ fuchsia-cprng = "0.1"
 wasm-bindgen = { version = "0.2.29", optional = true }
 stdweb = { version = "0.4.9", optional = true }
 
+[target.wasm32-unknown-wasi.dependencies]
+libc = "0.2.51"
+
 [features]
 std = []

README.md

@@ -45,7 +45,7 @@ This library is `no_std` compatible, but uses `std` on most platforms.
 The `log` library is supported as an optional dependency. If enabled, error
 reporting will be improved on some platforms.
 
-For WebAssembly (`wasm32`), Enscripten targets are supported directly; otherwise
+For WebAssembly (`wasm32`), WASI and Emscripten targets are supported directly; otherwise
 one of the following features must be enabled:
 
 -   [`wasm-bindgen`](https://crates.io/crates/wasm_bindgen)

src/lib.rs

@@ -27,6 +27,7 @@
 //! | SGX              | RDRAND
 //! | Web browsers     | [`Crypto.getRandomValues`][14] (see [Support for WebAssembly and ams.js][14])
 //! | Node.js          | [`crypto.randomBytes`][15] (see [Support for WebAssembly and ams.js][16])
+//! | WASI             | [`__wasi_random_get`][17]
 //!
 //! Getrandom doesn't have a blanket implementation for all Unix-like operating
 //! systems that reads from `/dev/urandom`. This ensures all supported operating
@@ -44,6 +45,10 @@
 //! features are activated for this crate. Note that if both features are
 //! enabled `wasm-bindgen` will be used. If neither feature is enabled,
 //! `getrandom` will always fail.
+//! 
+//! The WASI target `wasm32-unknown-wasi` uses the `__wasi_random_get` 
+//! function defined by the WASI standard.
+//! 
 //!
 //! ## Early boot
 //!
@@ -108,6 +113,7 @@
 //! [14]: https://www.w3.org/TR/WebCryptoAPI/#Crypto-method-getRandomValues
 //! [15]: https://nodejs.org/api/crypto.html#crypto_crypto_randombytes_size_callback
 //! [16]: #support-for-webassembly-and-amsjs
+//! [17]: https://github.com/CraneStation/wasmtime/blob/master/docs/WASI-api.md#__wasi_random_get
 
 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk.png",
        html_favicon_url = "https://www.rust-lang.org/favicon.ico",
@@ -135,7 +141,10 @@ extern crate std;
     target_os = "dragonfly",
     target_os = "haiku",
     target_os = "linux",
-    target_arch = "wasm32",
+    all(
+        target_arch = "wasm32", 
+        not(target_env = "wasi")
+    ),
 ))]
 mod utils;
 mod error;
@@ -181,11 +190,13 @@ mod_use!(cfg(target_os = "redox"), use_file);
 mod_use!(cfg(target_os = "solaris"), solaris_illumos);
 mod_use!(cfg(windows), windows);
 mod_use!(cfg(target_env = "sgx"), sgx);
+mod_use!(cfg(target_env = "wasi"), wasi);
 
 mod_use!(
     cfg(all(
         target_arch = "wasm32",
         not(target_os = "emscripten"),
+        not(target_env = "wasi"),
         feature = "wasm-bindgen"
     )),
     wasm32_bindgen
@@ -195,6 +206,7 @@ mod_use!(
     cfg(all(
         target_arch = "wasm32",
         not(target_os = "emscripten"),
+        not(target_env = "wasi"),
         not(feature = "wasm-bindgen"),
         feature = "stdweb",
     )),
@@ -225,6 +237,7 @@ mod_use!(
             target_arch = "wasm32",
             any(
                 target_os = "emscripten",
+                target_env = "wasi",
                 feature = "wasm-bindgen",
                 feature = "stdweb",
             ),

src/wasi.rs

@@ -0,0 +1,27 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+//! Implementation for WASI
+use crate::Error;
+use core::num::NonZeroU32;
+use std::io;
+
+pub fn getrandom_inner(dest: &mut [u8]) -> Result<(), Error> {
+    let ret = unsafe { 
+        libc::__wasi_random_get(dest.as_mut_ptr() as *mut libc::c_void, dest.len())
+    };
+    if ret == libc::__WASI_ESUCCESS {
+        Ok(())
+    } else {
+        error!("WASI: __wasi_random_get failed with return value {}", ret);
+        Err(io::Error::last_os_error().into())
+    }
+}
+
+#[inline(always)]
+pub fn error_msg_inner(_: NonZeroU32) -> Option<&'static str> { None }