deno.land / std@0.177.1 / node / _process / streams.mjs
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import { Buffer } from "../buffer.ts";import { clearLine, clearScreenDown, cursorTo, moveCursor,} from "../internal/readline/callbacks.mjs";import { Duplex, Readable, Writable } from "../stream.ts";import { stdio } from "./stdio.mjs";import { fs as fsConstants } from "../internal_binding/constants.ts";
// https://github.com/nodejs/node/blob/00738314828074243c9a52a228ab4c68b04259ef/lib/internal/bootstrap/switches/is_main_thread.js#L41function createWritableStdioStream(writer, name) { const stream = new Writable({ write(buf, enc, cb) { if (!writer) { this.destroy( new Error(`Deno.${name} is not available in this environment`), ); return; } writer.writeSync(buf instanceof Uint8Array ? buf : Buffer.from(buf, enc)); cb(); }, destroy(err, cb) { cb(err); this._undestroy(); if (!this._writableState.emitClose) { nextTick(() => this.emit("close")); } }, }); stream.fd = writer?.rid ?? -1; stream.destroySoon = stream.destroy; stream._isStdio = true; stream.once("close", () => writer?.close()); Object.defineProperties(stream, { columns: { enumerable: true, configurable: true, get: () => Deno.isatty?.(writer?.rid) ? Deno.consoleSize?.().columns : undefined, }, rows: { enumerable: true, configurable: true, get: () => Deno.isatty?.(writer?.rid) ? Deno.consoleSize?.().rows : undefined, }, isTTY: { enumerable: true, configurable: true, get: () => Deno.isatty?.(writer?.rid), }, getWindowSize: { enumerable: true, configurable: true, value: () => Deno.isatty?.(writer?.rid) ? Object.values(Deno.consoleSize?.()) : undefined, }, });
if (Deno.isatty?.(writer?.rid)) { // These belong on tty.WriteStream(), but the TTY streams currently have // following problems: // 1. Using them here introduces a circular dependency. // 2. Creating a net.Socket() from a fd is not currently supported. stream.cursorTo = function (x, y, callback) { return cursorTo(this, x, y, callback); };
stream.moveCursor = function (dx, dy, callback) { return moveCursor(this, dx, dy, callback); };
stream.clearLine = function (dir, callback) { return clearLine(this, dir, callback); };
stream.clearScreenDown = function (callback) { return clearScreenDown(this, callback); }; }
return stream;}
/** https://nodejs.org/api/process.html#process_process_stderr */export const stderr = stdio.stderr = createWritableStdioStream( Deno.stderr, "stderr",);
/** https://nodejs.org/api/process.html#process_process_stdout */export const stdout = stdio.stdout = createWritableStdioStream( Deno.stdout, "stdout",);
// TODO(PolarETech): This function should be replaced by// `guessHandleType()` in "../internal_binding/util.ts".// https://github.com/nodejs/node/blob/v18.12.1/src/node_util.cc#L257function _guessStdinType(fd) { if (typeof fd !== "number" || fd < 0) return "UNKNOWN"; if (Deno.isatty?.(fd)) return "TTY";
try { const fileInfo = Deno.fstatSync?.(fd);
// https://github.com/nodejs/node/blob/v18.12.1/deps/uv/src/unix/tty.c#L333 if (Deno.build.os !== "windows") { switch (fileInfo.mode & fsConstants.S_IFMT) { case fsConstants.S_IFREG: case fsConstants.S_IFCHR: return "FILE"; case fsConstants.S_IFIFO: return "PIPE"; case fsConstants.S_IFSOCK: // TODO(PolarETech): Need a better way to identify "TCP". // Currently, unable to exclude UDP. return "TCP"; default: return "UNKNOWN"; } }
// https://github.com/nodejs/node/blob/v18.12.1/deps/uv/src/win/handle.c#L31 if (fileInfo.isFile) { // TODO(PolarETech): Need a better way to identify a piped stdin on Windows. // On Windows, `Deno.fstatSync(rid).isFile` returns true even for a piped stdin. // Therefore, a piped stdin cannot be distinguished from a file by this property. // The mtime, atime, and birthtime of the file are "2339-01-01T00:00:00.000Z", // so use the property as a workaround. if (fileInfo.birthtime.valueOf() === 11644473600000) return "PIPE"; return "FILE"; } } catch (e) { // TODO(PolarETech): Need a better way to identify a character file on Windows. // "EISDIR" error occurs when stdin is "null" on Windows, // so use the error as a workaround. if (Deno.build.os === "windows" && e.code === "EISDIR") return "FILE"; }
return "UNKNOWN";}
const _read = function (size) { const p = Buffer.alloc(size || 16 * 1024); Deno.stdin?.read(p).then((length) => { this.push(length === null ? null : p.slice(0, length)); }, (error) => { this.destroy(error); });};
/** https://nodejs.org/api/process.html#process_process_stdin */// https://github.com/nodejs/node/blob/v18.12.1/lib/internal/bootstrap/switches/is_main_thread.js#L189export const stdin = stdio.stdin = (() => { const fd = Deno.stdin?.rid; let _stdin; const stdinType = _guessStdinType(fd);
switch (stdinType) { case "FILE": { // Since `fs.ReadStream` cannot be imported before process initialization, // use `Readable` instead. // https://github.com/nodejs/node/blob/v18.12.1/lib/internal/bootstrap/switches/is_main_thread.js#L200 // https://github.com/nodejs/node/blob/v18.12.1/lib/internal/fs/streams.js#L148 _stdin = new Readable({ highWaterMark: 64 * 1024, autoDestroy: false, read: _read, }); break; } case "TTY": case "PIPE": case "TCP": { // TODO(PolarETech): // For TTY, `new Duplex()` should be replaced `new tty.ReadStream()` if possible. // There are two problems that need to be resolved. // 1. Using them here introduces a circular dependency. // 2. Creating a tty.ReadStream() is not currently supported. // https://github.com/nodejs/node/blob/v18.12.1/lib/internal/bootstrap/switches/is_main_thread.js#L194 // https://github.com/nodejs/node/blob/v18.12.1/lib/tty.js#L47
// For PIPE and TCP, `new Duplex()` should be replaced `new net.Socket()` if possible. // There are two problems that need to be resolved. // 1. Using them here introduces a circular dependency. // 2. Creating a net.Socket() from a fd is not currently supported. // https://github.com/nodejs/node/blob/v18.12.1/lib/internal/bootstrap/switches/is_main_thread.js#L206 // https://github.com/nodejs/node/blob/v18.12.1/lib/net.js#L329 _stdin = new Duplex({ readable: stdinType === "TTY" ? undefined : true, writable: stdinType === "TTY" ? undefined : false, readableHighWaterMark: stdinType === "TTY" ? 0 : undefined, allowHalfOpen: false, emitClose: false, autoDestroy: true, decodeStrings: false, read: _read, });
if (stdinType !== "TTY") { // Make sure the stdin can't be `.end()`-ed _stdin._writableState.ended = true; } break; } default: { // Provide a dummy contentless input for e.g. non-console // Windows applications. _stdin = new Readable({ read() {} }); _stdin.push(null); } }
return _stdin;})();stdin.on("close", () => Deno.stdin?.close());stdin.fd = Deno.stdin?.rid ?? -1;Object.defineProperty(stdin, "isTTY", { enumerable: true, configurable: true, get() { return Deno.isatty?.(Deno.stdin.rid); },});stdin._isRawMode = false;stdin.setRawMode = (enable) => { Deno.stdin?.setRaw?.(enable); stdin._isRawMode = enable; return stdin;};Object.defineProperty(stdin, "isRaw", { enumerable: true, configurable: true, get() { return stdin._isRawMode; },});
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11 months ago
