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Rewrite readFile and writeFile (#2000)

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Using open/read/write
This commit is contained in:
Bartek Iwańczuk 2019-03-28 04:29:36 +01:00 • committed by Ryan Dahl
parent d0b6152f11
commit 597ee38ef2
10 changed files with 337 additions and 190 deletions
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70
js/write_file.ts
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@ -1,35 +1,7 @@
// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
import * as msg from "gen/msg_generated";
import * as flatbuffers from "./flatbuffers";
import * as dispatch from "./dispatch";
function req(
filename: string,
data: Uint8Array,
options: WriteFileOptions
): [flatbuffers.Builder, msg.Any, flatbuffers.Offset, Uint8Array] {
const builder = flatbuffers.createBuilder();
const filename_ = builder.createString(filename);
msg.WriteFile.startWriteFile(builder);
msg.WriteFile.addFilename(builder, filename_);
// Perm is not updated by default
if (options.perm !== undefined && options.perm !== null) {
msg.WriteFile.addUpdatePerm(builder, true);
msg.WriteFile.addPerm(builder, options.perm!);
} else {
msg.WriteFile.addUpdatePerm(builder, false);
msg.WriteFile.addPerm(builder, 0o666);
}
// Create is turned on by default
if (options.create !== undefined) {
msg.WriteFile.addIsCreate(builder, !!options.create);
} else {
msg.WriteFile.addIsCreate(builder, true);
}
msg.WriteFile.addIsAppend(builder, !!options.append);
const inner = msg.WriteFile.endWriteFile(builder);
return [builder, msg.Any.WriteFile, inner, data];
}
import { stat, statSync } from "./stat";
import { open, openSync } from "./files";
import { chmod, chmodSync } from "./chmod";
/** Options for writing to a file.
* `perm` would change the file's permission if set.
@ -53,7 +25,23 @@ export function writeFileSync(
data: Uint8Array,
options: WriteFileOptions = {}
): void {
dispatch.sendSync(...req(filename, data, options));
if (options.create !== undefined) {
const create = !!options.create;
if (!create) {
// verify that file exists
statSync(filename);
}
}
const openMode = !!options.append ? "a" : "w";
const file = openSync(filename, openMode);
if (options.perm !== undefined && options.perm !== null) {
chmodSync(filename, options.perm);
}
file.writeSync(data);
file.close();
}
/** Write a new file, with given filename and data.
@ -67,5 +55,21 @@ export async function writeFile(
data: Uint8Array,
options: WriteFileOptions = {}
): Promise<void> {
await dispatch.sendAsync(...req(filename, data, options));
if (options.create !== undefined) {
const create = !!options.create;
if (!create) {
// verify that file exists
await stat(filename);
}
}
const openMode = !!options.append ? "a" : "w";
const file = await open(filename, openMode);
if (options.perm !== undefined && options.perm !== null) {
await chmod(filename, options.perm);
}
await file.write(data);
file.close();
}