mirror of
https://github.com/denoland/deno.git
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366 lines
11 KiB
TypeScript
366 lines
11 KiB
TypeScript
// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
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import {
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EOF,
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Reader,
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Writer,
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Seeker,
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Closer,
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SeekMode,
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SyncReader,
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SyncWriter,
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SyncSeeker
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} from "./io.ts";
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import { sendAsyncMinimal, sendSyncMinimal } from "./dispatch_minimal.ts";
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import {
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sendSync as sendSyncJson,
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sendAsync as sendAsyncJson
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} from "./dispatch_json.ts";
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import { OPS_CACHE } from "./runtime.ts";
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// This is done because read/write are extremely performance sensitive.
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let OP_READ = -1;
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let OP_WRITE = -1;
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/** Synchronously open a file and return an instance of the `File` object.
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*
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* const file = Deno.openSync("/foo/bar.txt", { read: true, write: true });
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*
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* Requires `allow-read` and `allow-write` permissions depending on mode.
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*/
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export function openSync(filename: string, mode?: OpenOptions): File;
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/** Synchronously open a file and return an instance of the `File` object.
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*
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* const file = Deno.openSync("/foo/bar.txt", "r");
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*
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* Requires `allow-read` and `allow-write` permissions depending on mode.
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*/
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export function openSync(filename: string, mode?: OpenMode): File;
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/**@internal*/
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export function openSync(
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filename: string,
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modeOrOptions: OpenOptions | OpenMode = "r"
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): File {
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let mode = null;
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let options = null;
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if (typeof modeOrOptions === "string") {
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mode = modeOrOptions;
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} else {
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checkOpenOptions(modeOrOptions);
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options = modeOrOptions;
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}
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const rid = sendSyncJson("op_open", { filename, options, mode });
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return new File(rid);
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}
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/** Open a file and resolve to an instance of the `File` object.
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*
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* const file = await Deno.open("/foo/bar.txt", { read: true, write: true });
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*
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* Requires `allow-read` and `allow-write` permissions depending on mode.
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*/
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export async function open(
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filename: string,
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options?: OpenOptions
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): Promise<File>;
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/** Open a file and resolves to an instance of `Deno.File`.
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*
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* const file = await Deno.open("/foo/bar.txt, "w+");
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*
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* Requires `allow-read` and `allow-write` permissions depending on mode.
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*/
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export async function open(filename: string, mode?: OpenMode): Promise<File>;
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/**@internal*/
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export async function open(
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filename: string,
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modeOrOptions: OpenOptions | OpenMode = "r"
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): Promise<File> {
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let mode = null;
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let options = null;
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if (typeof modeOrOptions === "string") {
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mode = modeOrOptions;
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} else {
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checkOpenOptions(modeOrOptions);
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options = modeOrOptions;
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}
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const rid = await sendAsyncJson("op_open", {
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filename,
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options,
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mode
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});
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return new File(rid);
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}
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/** Creates a file if none exists or truncates an existing file and returns
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* an instance of `Deno.File`.
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*
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* const file = Deno.createSync("/foo/bar.txt");
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*
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* Requires `allow-read` and `allow-write` permissions.
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*/
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export function createSync(filename: string): File {
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return openSync(filename, "w+");
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}
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/** Creates a file if none exists or truncates an existing file and resolves to
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* an instance of `Deno.File`.
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*
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* const file = await Deno.create("/foo/bar.txt");
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*
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* Requires `allow-read` and `allow-write` permissions.
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*/
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export function create(filename: string): Promise<File> {
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return open(filename, "w+");
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}
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/** Synchronously read from a file ID into an array buffer.
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*
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* Returns `number | EOF` for the operation.
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*
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* const file = Deno.openSync("/foo/bar.txt");
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* const buf = new Uint8Array(100);
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* const nread = Deno.readSync(file.rid, buf);
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* const text = new TextDecoder().decode(buf);
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*/
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export function readSync(rid: number, p: Uint8Array): number | EOF {
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if (p.length == 0) {
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return 0;
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}
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if (OP_READ < 0) {
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OP_READ = OPS_CACHE["op_read"];
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}
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const nread = sendSyncMinimal(OP_READ, rid, p);
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if (nread < 0) {
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throw new Error("read error");
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} else if (nread == 0) {
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return EOF;
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} else {
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return nread;
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}
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}
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/** Read from a resource ID into an array buffer.
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*
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* Resolves to the `number | EOF` for the operation.
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*
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* const file = await Deno.open("/foo/bar.txt");
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* const buf = new Uint8Array(100);
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* const nread = await Deno.read(file.rid, buf);
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* const text = new TextDecoder().decode(buf);
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*/
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export async function read(rid: number, p: Uint8Array): Promise<number | EOF> {
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if (p.length == 0) {
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return 0;
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}
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if (OP_READ < 0) {
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OP_READ = OPS_CACHE["op_read"];
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}
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const nread = await sendAsyncMinimal(OP_READ, rid, p);
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if (nread < 0) {
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throw new Error("read error");
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} else if (nread == 0) {
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return EOF;
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} else {
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return nread;
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}
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}
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/** Synchronously write to the resource ID the contents of the array buffer.
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*
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* Resolves to the number of bytes written.
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*
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* const encoder = new TextEncoder();
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* const data = encoder.encode("Hello world\n");
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* const file = Deno.openSync("/foo/bar.txt", {create: true, write: true});
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* Deno.writeSync(file.rid, data);
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*/
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export function writeSync(rid: number, p: Uint8Array): number {
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if (OP_WRITE < 0) {
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OP_WRITE = OPS_CACHE["op_write"];
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}
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const result = sendSyncMinimal(OP_WRITE, rid, p);
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if (result < 0) {
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throw new Error("write error");
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} else {
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return result;
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}
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}
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/** Write to the resource ID the contents of the array buffer.
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*
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* Resolves to the number of bytes written.
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*
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* const encoder = new TextEncoder();
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* const data = encoder.encode("Hello world\n");
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* const file = await Deno.open("/foo/bar.txt", {create: true, write: true});
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* await Deno.write(file.rid, data);
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*/
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export async function write(rid: number, p: Uint8Array): Promise<number> {
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if (OP_WRITE < 0) {
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OP_WRITE = OPS_CACHE["op_write"];
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}
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const result = await sendAsyncMinimal(OP_WRITE, rid, p);
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if (result < 0) {
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throw new Error("write error");
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} else {
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return result;
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}
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}
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/** Synchronously seek a file ID to the given offset under mode given by `whence`.
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*
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* Returns the number of cursor position.
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*
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* const file = Deno.openSync("/foo/bar.txt");
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* const position = Deno.seekSync(file.rid, 0, 0);
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*/
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export function seekSync(
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rid: number,
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offset: number,
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whence: SeekMode
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): number {
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return sendSyncJson("op_seek", { rid, offset, whence });
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}
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/** Seek a file ID to the given offset under mode given by `whence`.
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*
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* Resolves with the number of cursor position.
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*
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* const file = await Deno.open("/foo/bar.txt");
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* const position = await Deno.seek(file.rid, 0, 0);
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*/
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export async function seek(
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rid: number,
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offset: number,
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whence: SeekMode
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): Promise<number> {
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return await sendAsyncJson("op_seek", { rid, offset, whence });
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}
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/** Close the given resource ID. */
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export function close(rid: number): void {
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sendSyncJson("op_close", { rid });
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}
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/** The Deno abstraction for reading and writing files. */
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export class File
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implements
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Reader,
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SyncReader,
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Writer,
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SyncWriter,
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Seeker,
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SyncSeeker,
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Closer {
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constructor(readonly rid: number) {}
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write(p: Uint8Array): Promise<number> {
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return write(this.rid, p);
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}
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writeSync(p: Uint8Array): number {
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return writeSync(this.rid, p);
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}
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read(p: Uint8Array): Promise<number | EOF> {
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return read(this.rid, p);
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}
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readSync(p: Uint8Array): number | EOF {
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return readSync(this.rid, p);
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}
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seek(offset: number, whence: SeekMode): Promise<number> {
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return seek(this.rid, offset, whence);
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}
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seekSync(offset: number, whence: SeekMode): number {
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return seekSync(this.rid, offset, whence);
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}
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close(): void {
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close(this.rid);
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}
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}
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/** An instance of `Deno.File` for `stdin`. */
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export const stdin = new File(0);
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/** An instance of `Deno.File` for `stdout`. */
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export const stdout = new File(1);
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/** An instance of `Deno.File` for `stderr`. */
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export const stderr = new File(2);
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export interface OpenOptions {
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/** Sets the option for read access. This option, when `true`, means that the
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* file should be read-able if opened. */
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read?: boolean;
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/** Sets the option for write access. This option, when `true`, means that
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* the file should be write-able if opened. If the file already exists,
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* any write calls on it will overwrite its contents, by default without
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* truncating it. */
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write?: boolean;
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/**Sets the option for the append mode. This option, when `true`, means that
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* writes will append to a file instead of overwriting previous contents.
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* Note that setting `{ write: true, append: true }` has the same effect as
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* setting only `{ append: true }`. */
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append?: boolean;
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/** Sets the option for truncating a previous file. If a file is
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* successfully opened with this option set it will truncate the file to `0`
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* length if it already exists. The file must be opened with write access
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* for truncate to work. */
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truncate?: boolean;
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/** Sets the option to allow creating a new file, if one doesn't already
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* exist at the specified path. Requires write or append access to be
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* used. */
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create?: boolean;
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/** Defaults to `false`. If set to `true`, no file, directory, or symlink is
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* allowed to exist at the target location. Requires write or append
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* access to be used. When createNew is set to `true`, create and truncate
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* are ignored. */
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createNew?: boolean;
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}
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/** A set of string literals which specify the open mode of a file.
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*
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* |Value |Description |
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* |------|--------------------------------------------------------------------------------------------------|
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* |`"r"` |Read-only. Default. Starts at beginning of file. |
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* |`"r+"`|Read-write. Start at beginning of file. |
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* |`"w"` |Write-only. Opens and truncates existing file or creates new one for writing only. |
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* |`"w+"`|Read-write. Opens and truncates existing file or creates new one for writing and reading. |
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* |`"a"` |Write-only. Opens existing file or creates new one. Each write appends content to the end of file.|
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* |`"a+"`|Read-write. Behaves like `"a"` and allows to read from file. |
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* |`"x"` |Write-only. Exclusive create - creates new file only if one doesn't exist already. |
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* |`"x+"`|Read-write. Behaves like `x` and allows reading from file. |
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*/
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export type OpenMode = "r" | "r+" | "w" | "w+" | "a" | "a+" | "x" | "x+";
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/** Check if OpenOptions is set to valid combination of options.
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* @returns Tuple representing if openMode is valid and error message if it's not
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* @internal
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*/
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function checkOpenOptions(options: OpenOptions): void {
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if (Object.values(options).filter(val => val === true).length === 0) {
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throw new Error("OpenOptions requires at least one option to be true");
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}
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if (options.truncate && !options.write) {
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throw new Error("'truncate' option requires 'write' option");
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}
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const createOrCreateNewWithoutWriteOrAppend =
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(options.create || options.createNew) && !(options.write || options.append);
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if (createOrCreateNewWithoutWriteOrAppend) {
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throw new Error(
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"'create' or 'createNew' options require 'write' or 'append' option"
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);
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}
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}
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