1
0
Fork 0
mirror of https://github.com/denoland/deno.git synced 2024-12-12 02:27:46 -05:00
denoland-deno/js/read_link.ts
2018-10-14 17:38:23 -04:00

42 lines
1.4 KiB
TypeScript

// Copyright 2018 the Deno authors. All rights reserved. MIT license.
import * as msg from "gen/msg_generated";
import { flatbuffers } from "flatbuffers";
import { assert } from "./util";
import * as dispatch from "./dispatch";
/** Returns the destination of the named symbolic link synchronously.
*
* import { readlinkSync } from "deno";
* const targetPath = readlinkSync("symlink/path");
*/
export function readlinkSync(name: string): string {
return res(dispatch.sendSync(...req(name)));
}
/** Returns the destination of the named symbolic link.
*
* import { readlink } from "deno";
* const targetPath = await readlink("symlink/path");
*/
export async function readlink(name: string): Promise<string> {
return res(await dispatch.sendAsync(...req(name)));
}
function req(name: string): [flatbuffers.Builder, msg.Any, flatbuffers.Offset] {
const builder = new flatbuffers.Builder();
const name_ = builder.createString(name);
msg.Readlink.startReadlink(builder);
msg.Readlink.addName(builder, name_);
const inner = msg.Readlink.endReadlink(builder);
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!;
}