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Js-polyfill using wasi-common crate #720

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2fbb782
Draft out js-polyfill using wasi-common crate
Dec 11, 2019
d9a1be6
Use build.sh instead of .cargo/config
Jan 1, 2020
b91ec3e
Remove workspace exclude from root Cargo.toml
Jan 1, 2020
133e201
Use latest wasi_snapshot_preview1
Jan 1, 2020
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408 changes: 408 additions & 0 deletions crates/wasi-common/js-polyfill/Cargo.lock
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13 changes: 13 additions & 0 deletions crates/wasi-common/js-polyfill/Cargo.toml
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[package]
name = "polyfill"
version = "0.1.0"
authors = ["The Wasmtime Project Developers"]
edition = "2018"

[dependencies]
wasi-common = { path = ".." }

# This crate is built with the wasm32-unknown-emscripten target, so it's separate
# from the main Wasmtime build, so use this directive to exclude it
# from the parent directory's workspace.
[workspace]
Binary file added crates/wasi-common/js-polyfill/assets/WASI-small.png
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23 changes: 23 additions & 0 deletions crates/wasi-common/js-polyfill/assets/load-files.js
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mergeInto(LibraryManager.library, {
loadFiles: function() {
const imports = { wasi_snapshot_preview1: WASIPolyfill };
let file = document.getElementById("input").files[0];
let file_with_mime_type = file.slice(0, file.size, "application/wasm");
let response = new Response(file_with_mime_type);
wasi_instantiateStreaming(response, imports)
.then(obj => {
setInstance(obj.instance);
try {
obj.instance.exports._start();
} catch (e) {
if (e instanceof WASIExit) {
handleWASIExit(e);
} else {
}
}
})
.catch(error => {
console.log("error! " + error);
});
}
});
88 changes: 88 additions & 0 deletions crates/wasi-common/js-polyfill/assets/shell.html
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<!doctype html>
<!-- This file is derived from src/shell_minimal.html in Emscripten. -->
<html lang="en-us">
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>WASI Web Polyfill</title>
<style>
.wasi { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
textarea.wasi { font-family: monospace; width: 80%; }
div.wasi { text-align: center; }
div.wasi_border { border: 1px solid black; }
</style>
</head>
<body>
<figure style="overflow:visible;" id="spinner"><div class="spinner"></div><center style="margin-top:0.5em"><strong>WASI</strong></center></figure>
<div class="wasi" id="status">Downloading...</div>
<div class="wasi">
<progress value="0" max="100" id="progress" hidden=1></progress>
</div>
<img class="wasi" src="WASI-small.png" width="200" height="200" border="0" alt="WASI logo">
<input class="wasi" type="file" id="input" onchange="_handleFiles(this.files)">
<hr>
<textarea class="wasi" id="output" rows="8"></textarea>
<script type='text/javascript'>
var statusElement = document.getElementById('status');
var progressElement = document.getElementById('progress');
var spinnerElement = document.getElementById('spinner');

var Module = {
preRun: [],
postRun: [],
print: (function() {
var element = document.getElementById('output');
if (element) element.value = ''; // clear browser cache
return function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
console.log(text);
if (element) {
element.value += text + "\n";
element.scrollTop = element.scrollHeight; // focus on bottom
}
};
})(),
printErr: function(text) {
if (arguments.length > 1) text = Array.prototype.slice.call(arguments).join(' ');
console.error(text);
},
setStatus: function(text) {
if (!Module.setStatus.last) Module.setStatus.last = { time: Date.now(), text: '' };
if (text === Module.setStatus.last.text) return;
var m = text.match(/([^(]+)\((\d+(\.\d+)?)\/(\d+)\)/);
var now = Date.now();
if (m && now - Module.setStatus.last.time < 30) return; // if this is a progress update, skip it if too soon
Module.setStatus.last.time = now;
Module.setStatus.last.text = text;
if (m) {
text = m[1];
progressElement.value = parseInt(m[2])*100;
progressElement.max = parseInt(m[4])*100;
progressElement.hidden = false;
spinnerElement.hidden = false;
} else {
progressElement.value = null;
progressElement.max = null;
progressElement.hidden = true;
if (!text) spinnerElement.hidden = true;
}
statusElement.innerHTML = text;
},
totalDependencies: 0,
monitorRunDependencies: function(left) {
this.totalDependencies = Math.max(this.totalDependencies, left);
Module.setStatus(left ? 'Preparing... (' + (this.totalDependencies-left) + '/' + this.totalDependencies + ')' : 'All downloads complete.');
}
};
Module.setStatus('Downloading...');
window.onerror = function() {
Module.setStatus('Exception thrown, see JavaScript console');
spinnerElement.style.display = 'none';
Module.setStatus = function(text) {
if (text) Module.printErr('[post-exception status] ' + text);
};
};
</script>
{{{ SCRIPT }}}
</body>
</html>
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