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denoland-deno/js/read_link.ts
Ryan Dahl bdc97b3976
Organize dispatch a bit (#2796)
Just some clean up reorganization around flatbuffer/minimal dispatch
code. This is prep for adding a JSON dispatcher.
2019-08-21 20:42:48 -04:00

36 lines
1.2 KiB
TypeScript

// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import { assert } from "./util";
import { sendSync, sendAsync, msg, flatbuffers } from "./dispatch_flatbuffers";
function req(name: string): [flatbuffers.Builder, msg.Any, flatbuffers.Offset] {
const builder = flatbuffers.createBuilder();
const name_ = builder.createString(name);
const inner = msg.Readlink.createReadlink(builder, name_);
return [builder, msg.Any.Readlink, inner];
}
function res(baseRes: null | msg.Base): string {
assert(baseRes !== null);
assert(msg.Any.ReadlinkRes === baseRes!.innerType());
const res = new msg.ReadlinkRes();
assert(baseRes!.inner(res) !== null);
const path = res.path();
assert(path !== null);
return path!;
}
/** Returns the destination of the named symbolic link synchronously.
*
* const targetPath = Deno.readlinkSync("symlink/path");
*/
export function readlinkSync(name: string): string {
return res(sendSync(...req(name)));
}
/** Returns the destination of the named symbolic link.
*
* const targetPath = await Deno.readlink("symlink/path");
*/
export async function readlink(name: string): Promise<string> {
return res(await sendAsync(...req(name)));
}