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0d03fafbfe
Refactors handlers.rs The idea is that all Deno "ops" (aka bindings) should map onto a Rust Future. By setting the "sync" flag in the Base message users can determine if the future is executed immediately or put on the event loop. In the case of async futures, a promise is automatically created. Errors are automatically forwarded and raised. TODO: - The file system ops in src/handler.rs are not using the thread pool yet. This will be done in the future using tokio_threadpool::blocking. That is, if you try to call them asynchronously, you will get a promise and it will act asynchronous, but currently it will be blocking. - Handlers in src/handler.rs returned boxed futures. This was to make it easy while developing. We should try to remove this allocation.
77 lines
2.2 KiB
TypeScript
77 lines
2.2 KiB
TypeScript
// Copyright 2018 the Deno authors. All rights reserved. MIT license.
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// TODO Rename this file to //js/dispatch.ts
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import { libdeno } from "./libdeno";
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import { flatbuffers } from "flatbuffers";
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import { deno as fbs } from "gen/msg_generated";
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import * as errors from "./errors";
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import * as util from "./util";
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let nextCmdId = 0;
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const promiseTable = new Map<number, util.Resolvable<fbs.Base>>();
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export function handleAsyncMsgFromRust(ui8: Uint8Array) {
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const bb = new flatbuffers.ByteBuffer(ui8);
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const base = fbs.Base.getRootAsBase(bb);
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const cmdId = base.cmdId();
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const promise = promiseTable.get(cmdId);
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util.assert(promise != null, `Expecting promise in table. ${cmdId}`);
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promiseTable.delete(cmdId);
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const err = errors.maybeError(base);
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if (err != null) {
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promise!.reject(err);
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} else {
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promise!.resolve(base);
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}
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}
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// @internal
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export function sendAsync(
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builder: flatbuffers.Builder,
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msgType: fbs.Any,
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msg: flatbuffers.Offset
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): Promise<fbs.Base> {
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const [cmdId, resBuf] = sendInternal(builder, msgType, msg, false);
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util.assert(resBuf == null);
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const promise = util.createResolvable<fbs.Base>();
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promiseTable.set(cmdId, promise);
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return promise;
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}
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// TODO Rename to sendSync
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// @internal
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export function send(
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builder: flatbuffers.Builder,
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msgType: fbs.Any,
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msg: flatbuffers.Offset
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): null | fbs.Base {
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const [cmdId, resBuf] = sendInternal(builder, msgType, msg, true);
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util.assert(cmdId >= 0);
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if (resBuf == null) {
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return null;
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} else {
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const u8 = new Uint8Array(resBuf!);
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// console.log("recv sync message", util.hexdump(u8));
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const bb = new flatbuffers.ByteBuffer(u8);
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const baseRes = fbs.Base.getRootAsBase(bb);
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errors.maybeThrowError(baseRes);
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return baseRes;
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}
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}
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function sendInternal(
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builder: flatbuffers.Builder,
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msgType: fbs.Any,
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msg: flatbuffers.Offset,
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sync = true
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): [number, null | Uint8Array] {
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const cmdId = nextCmdId++;
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fbs.Base.startBase(builder);
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fbs.Base.addMsg(builder, msg);
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fbs.Base.addMsgType(builder, msgType);
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fbs.Base.addSync(builder, sync);
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fbs.Base.addCmdId(builder, cmdId);
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builder.finish(fbs.Base.endBase(builder));
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return [cmdId, libdeno.send(builder.asUint8Array())];
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}
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