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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// TODO(petamoriken): enable prefer-primordials for node polyfills
// deno-lint-ignore-file prefer-primordials
import { EventEmitter } from "node:events";
import { Buffer } from "node:buffer";
import { promises, read, write } from "node:fs";
import {
BinaryOptionsArgument,
FileOptionsArgument,
ReadOptions,
TextOptionsArgument,
} from "ext:deno_node/_fs/_fs_common.ts";
import { core } from "ext:core/mod.js";
interface WriteResult {
bytesWritten: number;
buffer: Buffer | string;
}
interface ReadResult {
bytesRead: number;
buffer: Buffer;
}
export class FileHandle extends EventEmitter {
#rid: number;
constructor(rid: number) {
super();
this.#rid = rid;
}
get fd() {
return this.#rid;
}
read(
buffer: Uint8Array,
offset?: number,
length?: number,
position?: number | null,
): Promise<ReadResult>;
read(options?: ReadOptions): Promise<ReadResult>;
read(
bufferOrOpt: Uint8Array | ReadOptions,
offset?: number,
length?: number,
position?: number | null,
): Promise<ReadResult> {
if (bufferOrOpt instanceof Uint8Array) {
return new Promise((resolve, reject) => {
read(
this.fd,
bufferOrOpt,
offset,
length,
position,
(err, bytesRead, buffer) => {
if (err) reject(err);
else resolve({ buffer: buffer, bytesRead: bytesRead });
},
);
});
} else {
return new Promise((resolve, reject) => {
read(this.fd, bufferOrOpt, (err, bytesRead, buffer) => {
if (err) reject(err);
else resolve({ buffer: buffer, bytesRead: bytesRead });
});
});
}
}
readFile(
opt?: TextOptionsArgument | BinaryOptionsArgument | FileOptionsArgument,
): Promise<string | Buffer> {
return promises.readFile(this, opt);
}
write(
buffer: Buffer,
offset: number,
length: number,
position: number,
): Promise<WriteResult>;
write(
str: string,
position: number,
encoding: string,
): Promise<WriteResult>;
write(
bufferOrStr: Uint8Array | string,
offsetOrPosition: number,
lengthOrEncoding: number | string,
position?: number,
): Promise<WriteResult> {
if (bufferOrStr instanceof Uint8Array) {
const buffer = bufferOrStr;
const offset = offsetOrPosition;
const length = lengthOrEncoding;
return new Promise((resolve, reject) => {
write(
this.fd,
buffer,
offset,
length,
position,
(err, bytesWritten, buffer) => {
if (err) reject(err);
else resolve({ buffer, bytesWritten });
},
);
});
} else {
const str = bufferOrStr;
const position = offsetOrPosition;
const encoding = lengthOrEncoding;
return new Promise((resolve, reject) => {
write(
this.fd,
str,
position,
encoding,
(err, bytesWritten, buffer) => {
if (err) reject(err);
else resolve({ buffer, bytesWritten });
},
);
});
}
}
writeFile(data, options): Promise<void> {
return fsCall(promises.writeFile, this, data, options);
}
close(): Promise<void> {
// Note that Deno.close is not async
return Promise.resolve(core.close(this.fd));
}
}
function fsCall(fn, handle, ...args) {
if (handle.fd === -1) {
const err = new Error("file closed");
throw Object.assign(err, {
code: "EBADF",
syscall: fn.name,
});
}
return fn(handle, ...args);
}
export default {
FileHandle,
};
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