_stream.mjs

// Copyright 2018-2022 the Deno authors. All rights reserved. MIT license.
// Copyright Joyent and Node contributors. All rights reserved. MIT license.
// deno-fmt-ignore-file
// deno-lint-ignore-file
import { nextTick } from "./_next_tick.ts";
import { stdio } from "./_process/stdio.mjs";

/* esm.sh - esbuild bundle(readable-stream@4.2.0) es2022 production */
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n=function(...r){if(new.target)throw ai();return R.Readable.from(oi(t,this,r))};Uf=n;let t=ni[e];H(n,"name",{__proto__:null,value:t.name}),H(n,"length",{__proto__:null,value:t.length}),H(R.Readable.prototype,e,{__proto__:null,value:n,enumerable:!1,configurable:!0,writable:!0})}var Uf;for(let e of ii(ri)){let n=function(...i){if(new.target)throw ai();return oi(t,this,i)};Uf=n;let t=ri[e];H(n,"name",{__proto__:null,value:t.name}),H(n,"length",{__proto__:null,value:t.length}),H(R.Readable.prototype,e,{__proto__:null,value:n,enumerable:!1,configurable:!0,writable:!0})}var Uf;R.Writable=Tt();R.Duplex=v();R.Transform=xt();R.PassThrough=Pt();R.pipeline=fi;var{addAbortSignal:Ff}=ke();R.addAbortSignal=Ff;R.finished=ui;R.destroy=vf;R.compose=$f;H(R,"promises",{__proto__:null,configurable:!0,enumerable:!0,get(){return Ft}});H(fi,li,{__proto__:null,enumerable:!0,get(){return Ft.pipeline}});H(ui,li,{__proto__:null,enumerable:!0,get(){return Ft.finished}});R.Stream=R;R._isUint8Array=function(t){return t instanceof Uint8Array};R._uint8ArrayToBuffer=function(t){return jf.from(t.buffer,t.byteOffset,t.byteLength)}});var ci=g((wu,A)=>{"use strict";var T=di(),Bf=vt(),Gf=T.Readable.destroy;A.exports=T.Readable;A.exports._uint8ArrayToBuffer=T._uint8ArrayToBuffer;A.exports._isUint8Array=T._isUint8Array;A.exports.isDisturbed=T.isDisturbed;A.exports.isErrored=T.isErrored;A.exports.isReadable=T.isReadable;A.exports.Readable=T.Readable;A.exports.Writable=T.Writable;A.exports.Duplex=T.Duplex;A.exports.Transform=T.Transform;A.exports.PassThrough=T.PassThrough;A.exports.addAbortSignal=T.addAbortSignal;A.exports.finished=T.finished;A.exports.destroy=T.destroy;A.exports.destroy=Gf;A.exports.pipeline=T.pipeline;A.exports.compose=T.compose;Object.defineProperty(T,"promises",{configurable:!0,enumerable:!0,get(){return Bf}});A.exports.Stream=T.Stream;A.exports.default=A.exports});var bi=Ri(ci()),{_uint8ArrayToBuffer:yu,_isUint8Array:gu,isDisturbed:Su,isErrored:Eu,isReadable:Ru,Readable:Au,Writable:mu,Duplex:Tu,Transform:Iu,PassThrough:Mu,addAbortSignal:Nu,finished:Du,destroy:Ou,pipeline:qu,compose:xu,Stream:Lu}=bi,{default:hi,...Hf}=bi,Pu=hi!==void 0?hi:Hf;export{Tu as Duplex,Mu as PassThrough,Au as Readable,Lu as Stream,Iu as Transform,mu as Writable,gu as _isUint8Array,yu as _uint8ArrayToBuffer,Nu as addAbortSignal,xu as compose,Pu as default,Ou as destroy,Du as finished,Su as isDisturbed,Eu as isErrored,Ru as isReadable,qu as pipeline};
/* End esm.sh bundle */

// The following code implements Readable.fromWeb(), Writable.fromWeb(), and
// Duplex.fromWeb(). These functions are not properly implemented in the
// readable-stream module yet. This can be removed once the following upstream
// issue is resolved: https://github.com/nodejs/readable-stream/issues/482

import {
  AbortError,
  ERR_INVALID_ARG_TYPE,
  ERR_INVALID_ARG_VALUE,
  ERR_STREAM_PREMATURE_CLOSE,
} from "./internal/errors.ts";
import { destroy } from "./internal/streams/destroy.mjs";
import finished from "./internal/streams/end-of-stream.mjs";
import {
  isDestroyed,
  isReadable,
  isReadableEnded,
  isWritable,
  isWritableEnded,
} from "./internal/streams/utils.mjs";
import { createDeferredPromise, kEmptyObject } from "./internal/util.mjs";
import { validateBoolean, validateObject } from "./internal/validators.mjs";

const process = __process$;
const { Buffer } = __buffer$;
const Readable = Au;
const Writable = mu;
const Duplex = Tu;

function isReadableStream(object) {
  return object instanceof ReadableStream;
}

function isWritableStream(object) {
  return object instanceof WritableStream;
}

Readable.fromWeb = function (
  readableStream,
  options = kEmptyObject,
) {
  if (!isReadableStream(readableStream)) {
    throw new ERR_INVALID_ARG_TYPE(
      "readableStream",
      "ReadableStream",
      readableStream,
    );
  }

  validateObject(options, "options");
  const {
    highWaterMark,
    encoding,
    objectMode = false,
    signal,
  } = options;

  if (encoding !== undefined && !Buffer.isEncoding(encoding)) {
    throw new ERR_INVALID_ARG_VALUE(encoding, "options.encoding");
  }
  validateBoolean(objectMode, "options.objectMode");

  const reader = readableStream.getReader();
  let closed = false;

  const readable = new Readable({
    objectMode,
    highWaterMark,
    encoding,
    signal,

    read() {
      reader.read().then(
        (chunk) => {
          if (chunk.done) {
            readable.push(null);
          } else {
            readable.push(chunk.value);
          }
        },
        (error) => destroy.call(readable, error),
      );
    },

    destroy(error, callback) {
      function done() {
        try {
          callback(error);
        } catch (error) {
          // In a next tick because this is happening within
          // a promise context, and if there are any errors
          // thrown we don't want those to cause an unhandled
          // rejection. Let's just escape the promise and
          // handle it separately.
          process.nextTick(() => {
            throw error;
          });
        }
      }

      if (!closed) {
        reader.cancel(error).then(done, done);
        return;
      }

      done();
    },
  });

  reader.closed.then(
    () => {
      closed = true;
      if (!isReadableEnded(readable)) {
        readable.push(null);
      }
    },
    (error) => {
      closed = true;
      destroy.call(readable, error);
    },
  );

  return readable;
};

Writable.fromWeb = function (
  writableStream,
  options = kEmptyObject,
) {
  if (!isWritableStream(writableStream)) {
    throw new ERR_INVALID_ARG_TYPE(
      "writableStream",
      "WritableStream",
      writableStream,
    );
  }

  validateObject(options, "options");
  const {
    highWaterMark,
    decodeStrings = true,
    objectMode = false,
    signal,
  } = options;

  validateBoolean(objectMode, "options.objectMode");
  validateBoolean(decodeStrings, "options.decodeStrings");

  const writer = writableStream.getWriter();
  let closed = false;

  const writable = new Writable({
    highWaterMark,
    objectMode,
    decodeStrings,
    signal,

    writev(chunks, callback) {
      function done(error) {
        error = error.filter((e) => e);
        try {
          callback(error.length === 0 ? undefined : error);
        } catch (error) {
          // In a next tick because this is happening within
          // a promise context, and if there are any errors
          // thrown we don't want those to cause an unhandled
          // rejection. Let's just escape the promise and
          // handle it separately.
          process.nextTick(() => destroy.call(writable, error));
        }
      }

      writer.ready.then(
        () =>
          Promise.all(
            chunks.map((data) => writer.write(data.chunk)),
          ).then(done, done),
        done,
      );
    },

    write(chunk, encoding, callback) {
      if (typeof chunk === "string" && decodeStrings && !objectMode) {
        chunk = Buffer.from(chunk, encoding);
        chunk = new Uint8Array(
          chunk.buffer,
          chunk.byteOffset,
          chunk.byteLength,
        );
      }

      function done(error) {
        try {
          callback(error);
        } catch (error) {
          destroy(this, duplex, error);
        }
      }

      writer.ready.then(
        () => writer.write(chunk).then(done, done),
        done,
      );
    },

    destroy(error, callback) {
      function done() {
        try {
          callback(error);
        } catch (error) {
          // In a next tick because this is happening within
          // a promise context, and if there are any errors
          // thrown we don't want those to cause an unhandled
          // rejection. Let's just escape the promise and
          // handle it separately.
          process.nextTick(() => {
            throw error;
          });
        }
      }

      if (!closed) {
        if (error != null) {
          writer.abort(error).then(done, done);
        } else {
          writer.close().then(done, done);
        }
        return;
      }

      done();
    },

    final(callback) {
      function done(error) {
        try {
          callback(error);
        } catch (error) {
          // In a next tick because this is happening within
          // a promise context, and if there are any errors
          // thrown we don't want those to cause an unhandled
          // rejection. Let's just escape the promise and
          // handle it separately.
          process.nextTick(() => destroy.call(writable, error));
        }
      }

      if (!closed) {
        writer.close().then(done, done);
      }
    },
  });

  writer.closed.then(
    () => {
      closed = true;
      if (!isWritableEnded(writable)) {
        destroy.call(writable, new ERR_STREAM_PREMATURE_CLOSE());
      }
    },
    (error) => {
      closed = true;
      destroy.call(writable, error);
    },
  );

  return writable;
};

Duplex.fromWeb = function (pair, options = kEmptyObject) {
  validateObject(pair, "pair");
  const {
    readable: readableStream,
    writable: writableStream,
  } = pair;

  if (!isReadableStream(readableStream)) {
    throw new ERR_INVALID_ARG_TYPE(
      "pair.readable",
      "ReadableStream",
      readableStream,
    );
  }
  if (!isWritableStream(writableStream)) {
    throw new ERR_INVALID_ARG_TYPE(
      "pair.writable",
      "WritableStream",
      writableStream,
    );
  }

  validateObject(options, "options");
  const {
    allowHalfOpen = false,
    objectMode = false,
    encoding,
    decodeStrings = true,
    highWaterMark,
    signal,
  } = options;

  validateBoolean(objectMode, "options.objectMode");
  if (encoding !== undefined && !Buffer.isEncoding(encoding)) {
    throw new ERR_INVALID_ARG_VALUE(encoding, "options.encoding");
  }

  const writer = writableStream.getWriter();
  const reader = readableStream.getReader();
  let writableClosed = false;
  let readableClosed = false;

  const duplex = new Duplex({
    allowHalfOpen,
    highWaterMark,
    objectMode,
    encoding,
    decodeStrings,
    signal,

    writev(chunks, callback) {
      function done(error) {
        error = error.filter((e) => e);
        try {
          callback(error.length === 0 ? undefined : error);
        } catch (error) {
          // In a next tick because this is happening within
          // a promise context, and if there are any errors
          // thrown we don't want those to cause an unhandled
          // rejection. Let's just escape the promise and
          // handle it separately.
          process.nextTick(() => destroy(duplex, error));
        }
      }

      writer.ready.then(
        () =>
          Promise.all(
            chunks.map((data) => writer.write(data.chunk)),
          ).then(done, done),
        done,
      );
    },

    write(chunk, encoding, callback) {
      if (typeof chunk === "string" && decodeStrings && !objectMode) {
        chunk = Buffer.from(chunk, encoding);
        chunk = new Uint8Array(
          chunk.buffer,
          chunk.byteOffset,
          chunk.byteLength,
        );
      }

      function done(error) {
        try {
          callback(error);
        } catch (error) {
          destroy(duplex, error);
        }
      }

      writer.ready.then(
        () => writer.write(chunk).then(done, done),
        done,
      );
    },

    final(callback) {
      function done(error) {
        try {
          callback(error);
        } catch (error) {
          // In a next tick because this is happening within
          // a promise context, and if there are any errors
          // thrown we don't want those to cause an unhandled
          // rejection. Let's just escape the promise and
          // handle it separately.
          process.nextTick(() => destroy(duplex, error));
        }
      }

      if (!writableClosed) {
        writer.close().then(done, done);
      }
    },

    read() {
      reader.read().then(
        (chunk) => {
          if (chunk.done) {
            duplex.push(null);
          } else {
            duplex.push(chunk.value);
          }
        },
        (error) => destroy(duplex, error),
      );
    },

    destroy(error, callback) {
      function done() {
        try {
          callback(error);
        } catch (error) {
          // In a next tick because this is happening within
          // a promise context, and if there are any errors
          // thrown we don't want those to cause an unhandled
          // rejection. Let's just escape the promise and
          // handle it separately.
          process.nextTick(() => {
            throw error;
          });
        }
      }

      async function closeWriter() {
        if (!writableClosed) {
          await writer.abort(error);
        }
      }

      async function closeReader() {
        if (!readableClosed) {
          await reader.cancel(error);
        }
      }

      if (!writableClosed || !readableClosed) {
        Promise.all([
          closeWriter(),
          closeReader(),
        ]).then(done, done);
        return;
      }

      done();
    },
  });

  writer.closed.then(
    () => {
      writableClosed = true;
      if (!isWritableEnded(duplex)) {
        destroy(duplex, new ERR_STREAM_PREMATURE_CLOSE());
      }
    },
    (error) => {
      writableClosed = true;
      readableClosed = true;
      destroy(duplex, error);
    },
  );

  reader.closed.then(
    () => {
      readableClosed = true;
      if (!isReadableEnded(duplex)) {
        duplex.push(null);
      }
    },
    (error) => {
      writableClosed = true;
      readableClosed = true;
      destroy(duplex, error);
    },
  );

  return duplex;
};

// readable-stream attaches these to Readable, but Node.js core does not.
// Delete them here to better match Node.js core. These can be removed once
// https://github.com/nodejs/readable-stream/issues/485 is resolved.
delete Readable.Duplex;
delete Readable.PassThrough;
delete Readable.Readable;
delete Readable.Stream;
delete Readable.Transform;
delete Readable.Writable;
delete Readable._isUint8Array;
delete Readable._uint8ArrayToBuffer;
delete Readable.addAbortSignal;
delete Readable.compose;
delete Readable.destroy;
delete Readable.finished;
delete Readable.isDisturbed;
delete Readable.isErrored;
delete Readable.isReadable;
delete Readable.pipeline;

// The following code implements Readable.toWeb(), Writable.toWeb(), and
// Duplex.toWeb(). These functions are not properly implemented in the
// readable-stream module yet. This can be removed once the following upstream
// issue is resolved: https://github.com/nodejs/readable-stream/issues/482
function newReadableStreamFromStreamReadable(
  streamReadable,
  options = kEmptyObject,
) {
  // Not using the internal/streams/utils isReadableNodeStream utility
  // here because it will return false if streamReadable is a Duplex
  // whose readable option is false. For a Duplex that is not readable,
  // we want it to pass this check but return a closed ReadableStream.
  if (typeof streamReadable?._readableState !== "object") {
    throw new ERR_INVALID_ARG_TYPE(
      "streamReadable",
      "stream.Readable",
      streamReadable,
    );
  }

  if (isDestroyed(streamReadable) || !isReadable(streamReadable)) {
    const readable = new ReadableStream();
    readable.cancel();
    return readable;
  }

  const objectMode = streamReadable.readableObjectMode;
  const highWaterMark = streamReadable.readableHighWaterMark;

  const evaluateStrategyOrFallback = (strategy) => {
    // If there is a strategy available, use it
    if (strategy) {
      return strategy;
    }

    if (objectMode) {
      // When running in objectMode explicitly but no strategy, we just fall
      // back to CountQueuingStrategy
      return new CountQueuingStrategy({ highWaterMark });
    }

    // When not running in objectMode explicitly, we just fall
    // back to a minimal strategy that just specifies the highWaterMark
    // and no size algorithm. Using a ByteLengthQueuingStrategy here
    // is unnecessary.
    return { highWaterMark };
  };

  const strategy = evaluateStrategyOrFallback(options?.strategy);

  let controller;

  function onData(chunk) {
    // Copy the Buffer to detach it from the pool.
    if (Buffer.isBuffer(chunk) && !objectMode) {
      chunk = new Uint8Array(chunk);
    }
    controller.enqueue(chunk);
    if (controller.desiredSize <= 0) {
      streamReadable.pause();
    }
  }

  streamReadable.pause();

  const cleanup = finished(streamReadable, (error) => {
    if (error?.code === "ERR_STREAM_PREMATURE_CLOSE") {
      const err = new AbortError(undefined, { cause: error });
      error = err;
    }

    cleanup();
    // This is a protection against non-standard, legacy streams
    // that happen to emit an error event again after finished is called.
    streamReadable.on("error", () => {});
    if (error) {
      return controller.error(error);
    }
    controller.close();
  });

  streamReadable.on("data", onData);

  return new ReadableStream({
    start(c) {
      controller = c;
    },

    pull() {
      streamReadable.resume();
    },

    cancel(reason) {
      destroy(streamReadable, reason);
    },
  }, strategy);
}

function newWritableStreamFromStreamWritable(streamWritable) {
  // Not using the internal/streams/utils isWritableNodeStream utility
  // here because it will return false if streamWritable is a Duplex
  // whose writable option is false. For a Duplex that is not writable,
  // we want it to pass this check but return a closed WritableStream.
  if (typeof streamWritable?._writableState !== "object") {
    throw new ERR_INVALID_ARG_TYPE(
      "streamWritable",
      "stream.Writable",
      streamWritable,
    );
  }

  if (isDestroyed(streamWritable) || !isWritable(streamWritable)) {
    const writable = new WritableStream();
    writable.close();
    return writable;
  }

  const highWaterMark = streamWritable.writableHighWaterMark;
  const strategy = streamWritable.writableObjectMode
    ? new CountQueuingStrategy({ highWaterMark })
    : { highWaterMark };

  let controller;
  let backpressurePromise;
  let closed;

  function onDrain() {
    if (backpressurePromise !== undefined) {
      backpressurePromise.resolve();
    }
  }

  const cleanup = finished(streamWritable, (error) => {
    if (error?.code === "ERR_STREAM_PREMATURE_CLOSE") {
      const err = new AbortError(undefined, { cause: error });
      error = err;
    }

    cleanup();
    // This is a protection against non-standard, legacy streams
    // that happen to emit an error event again after finished is called.
    streamWritable.on("error", () => {});
    if (error != null) {
      if (backpressurePromise !== undefined) {
        backpressurePromise.reject(error);
      }
      // If closed is not undefined, the error is happening
      // after the WritableStream close has already started.
      // We need to reject it here.
      if (closed !== undefined) {
        closed.reject(error);
        closed = undefined;
      }
      controller.error(error);
      controller = undefined;
      return;
    }

    if (closed !== undefined) {
      closed.resolve();
      closed = undefined;
      return;
    }
    controller.error(new AbortError());
    controller = undefined;
  });

  streamWritable.on("drain", onDrain);

  return new WritableStream({
    start(c) {
      controller = c;
    },

    async write(chunk) {
      if (streamWritable.writableNeedDrain || !streamWritable.write(chunk)) {
        backpressurePromise = createDeferredPromise();
        return backpressurePromise.promise.finally(() => {
          backpressurePromise = undefined;
        });
      }
    },

    abort(reason) {
      destroy(streamWritable, reason);
    },

    close() {
      if (closed === undefined && !isWritableEnded(streamWritable)) {
        closed = createDeferredPromise();
        streamWritable.end();
        return closed.promise;
      }

      controller = undefined;
      return Promise.resolve();
    },
  }, strategy);
}

function newReadableWritablePairFromDuplex(duplex) {
  // Not using the internal/streams/utils isWritableNodeStream and
  // isReadableNodestream utilities here because they will return false
  // if the duplex was created with writable or readable options set to
  // false. Instead, we'll check the readable and writable state after
  // and return closed WritableStream or closed ReadableStream as
  // necessary.
  if (
    typeof duplex?._writableState !== "object" ||
    typeof duplex?._readableState !== "object"
  ) {
    throw new ERR_INVALID_ARG_TYPE("duplex", "stream.Duplex", duplex);
  }

  if (isDestroyed(duplex)) {
    const writable = new WritableStream();
    const readable = new ReadableStream();
    writable.close();
    readable.cancel();
    return { readable, writable };
  }

  const writable = isWritable(duplex)
    ? newWritableStreamFromStreamWritable(duplex)
    : new WritableStream();

  if (!isWritable(duplex)) {
    writable.close();
  }

  const readable = isReadable(duplex)
    ? newReadableStreamFromStreamReadable(duplex)
    : new ReadableStream();

  if (!isReadable(duplex)) {
    readable.cancel();
  }

  return { writable, readable };
}

Readable.toWeb = newReadableStreamFromStreamReadable;
Writable.toWeb = newWritableStreamFromStreamWritable;
Duplex.toWeb = newReadableWritablePairFromDuplex;