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// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
((window) => {
const core = window.Deno.core;
const util = window.__bootstrap.util;
// Using an object without a prototype because `Map` was causing GC problems.
const promiseTable = Object.create(null);
let _nextPromiseId = 1;
function nextPromiseId() {
return _nextPromiseId++;
}
function decode(ui8) {
return JSON.parse(core.decode(ui8));
}
function encode(args) {
return core.encode(JSON.stringify(args));
}
function unwrapResponse(res) {
if (res.err != null) {
throw new (core.getErrorClass(res.err.className))(res.err.message);
}
util.assert(res.ok != null);
return res.ok;
}
function asyncMsgFromRust(resUi8) {
const res = decode(resUi8);
util.assert(res.promiseId != null);
const promise = promiseTable[res.promiseId];
util.assert(promise != null);
delete promiseTable[res.promiseId];
promise.resolve(res);
}
function sendSync(
opName,
args = {},
...zeroCopy
) {
util.log("sendSync", opName);
const argsUi8 = encode(args);
const resUi8 = core.dispatchByName(opName, argsUi8, ...zeroCopy);
util.assert(resUi8 != null);
const res = decode(resUi8);
util.assert(res.promiseId == null);
return unwrapResponse(res);
}
async function sendAsync(
opName,
args = {},
...zeroCopy
) {
util.log("sendAsync", opName);
const promiseId = nextPromiseId();
args = Object.assign(args, { promiseId });
const promise = util.createResolvable();
const argsUi8 = encode(args);
const buf = core.dispatchByName(opName, argsUi8, ...zeroCopy);
if (buf != null) {
// Sync result.
const res = decode(buf);
promise.resolve(res);
} else {
// Async result.
promiseTable[promiseId] = promise;
}
const res = await promise;
return unwrapResponse(res);
}
window.__bootstrap.dispatchJson = {
asyncMsgFromRust,
sendSync,
sendAsync,
};
})(this);
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