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// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
// Do not add flatbuffer dependencies to this module.
import * as util from "./util";
import { core } from "./core";
const DISPATCH_MINIMAL_TOKEN = 0xcafe;
const promiseTableMin = new Map<number, util.Resolvable<number>>();
let _nextPromiseId = 0;
export function nextPromiseId(): number {
return _nextPromiseId++;
}
export interface RecordMinimal {
promiseId: number;
opId: number;
arg: number;
result: number;
}
/** Determines if a message has the "minimal" serialization format. If false, it
* is flatbuffer encoded.
*/
export function hasMinimalToken(i32: Int32Array): boolean {
return i32[0] == DISPATCH_MINIMAL_TOKEN;
}
export function recordFromBufMinimal(buf32: Int32Array): null | RecordMinimal {
if (hasMinimalToken(buf32)) {
return {
promiseId: buf32[1],
opId: buf32[2],
arg: buf32[3],
result: buf32[4]
};
}
return null;
}
const scratch32 = new Int32Array(5);
const scratchBytes = new Uint8Array(
scratch32.buffer,
scratch32.byteOffset,
scratch32.byteLength
);
util.assert(scratchBytes.byteLength === scratch32.length * 4);
export function handleAsyncMsgFromRustMinimal(
ui8: Uint8Array,
record: RecordMinimal
): void {
// Fast and new
util.log("minimal handleAsyncMsgFromRust ", ui8.length);
const { promiseId, result } = record;
const promise = promiseTableMin.get(promiseId);
promiseTableMin.delete(promiseId);
promise!.resolve(result);
}
export function sendAsyncMinimal(
opId: number,
arg: number,
zeroCopy: Uint8Array
): Promise<number> {
const promiseId = nextPromiseId(); // AKA cmdId
scratch32[0] = DISPATCH_MINIMAL_TOKEN;
scratch32[1] = promiseId;
scratch32[2] = opId;
scratch32[3] = arg;
const promise = util.createResolvable<number>();
promiseTableMin.set(promiseId, promise);
core.dispatch(scratchBytes, zeroCopy);
return promise;
}
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