web.files.ReadableStream — clojure-interop/cljs-web-api 1.0.10

The ReadableStream interface of the Streams API represents a stream of byte data. The Fetch API offers a concrete instance a ReadableStream through the body property of a web.fetch.Response

cancel cljs

(cancel this reason)

Method.

The cancel() method of the web.files.ReadableStream interface the associated stream. The supplied reason parameter will be to the underlying source, which may or may not use it.

Promise<reason> readableStreamInstance.cancel(reason);

See also: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/cancel

constructor cljs

(constructor & args)

Constructor.

The ReadableStream() constructor creates and returns a readable stream object from the given handlers.

underlyingSource An object containing methods and properties that define how the constructed stream instance will behave. underlyingSource can contain the following:

start(controller) This is a method, called immediately when the object is constructed. The contents of this method are defined by the developer, and should aim to get access to the stream source, and do anything else required to set up the stream fuctionality. If this process is to be done asynchronously, it can return a promise to signal success or failure. The controller parameter passed to this method is a web.fetch.ReadableStreamDefaultController or a web.fetch.ReadableByteStreamController, depending on the value of the type property. This can be used by the developer to control the stream during set up. pull(controller) Optional This method, also defined by the developer, will be called repeatedly when the stream's internal queue of chunks is not full, up until it reaches its high water mark. If pull() returns a promise, then it won't be called again until that promise fulfills; if the promise rejects, the stream will become errored. The controller parameter passed to this method is a web.fetch.ReadableStreamDefaultController or a web.fetch.ReadableByteStreamController, depending on the value of the type property. This can be used by the developer to control the stream as more chunks are fetched. cancel(reason) Optional This method, also defined by the developer, will be called if the app signals that the stream is to be cancelled (e.g. if ReadableStream.cancel() is called). The contents should do whatever is necessary to release access to the stream source. If this process is asynchronous, it can return a promise to signal success or failure. The reason parameter contains a web.DOMString describing why the stream was cancelled. type Optional This property controls what type of readable stream is being dealt with. If it is included with a value set to bytes, the passed controller object will be a web.fetch.ReadableByteStreamController capable of handling a BYOB (bring your own buffer)/byte stream. If it is not included, the passed controller will be a web.fetch.ReadableStreamDefaultController. autoAllocateChunkSize Optional For byte streams, the developer can set the autoAllocateChunkSize with a positive integer value to turn on the stream's auto-allocation feature. With this turned on, the stream implementation will automatically allocate an js.ArrayBuffer with a size of the given integer, and call the underlying source code as if the consumer was using a BYOB reader.

queueingStrategy Optional An object that optionally defines a queueing strategy for the stream. This takes two parameters:

highWaterMark A non-negative integer — this defines the total number of chunks that can be contained in the internal queue before backpressure is applied. size(chunk) A method containing a parameter chunk — this indicates the size to use for each chunk, in bytes.

Note: You could define your own custom queueingStrategy, or use an instance of ByteLengthQueueingStrategy or CountQueueingStrategy for this object value. If no queueingStrategy is supplied, the default used is the same as a CountQueuingStrategy with a high water mark of 1.

See also: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/ReadableStream

get-reader cljs

(get-reader this & args)

Method.

The getReader() method of the web.files.ReadableStream interface a reader and locks the stream to it. While the stream is locked, other reader can be acquired until this one is released.

var reader = readableStreamInstance.getReader({mode});

See also: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/getReader

locked cljs

(locked this)

Property.

[Read Only]

The locked getter property of the web.files.ReadableStream returns whether or not the readable stream is locked to a reader.

var locked = readableStreamInstance.locked;

See also: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/locked

pipe-through cljs

(pipe-through this & args)

Method.

[Experimental]

The pipeThrough() method of the web.files.ReadableStream interface a chainable way of piping the current stream through a transform or any other writable/readable pair.

ReadableStream readableStreamInstance.pipeThrough(transformStream[, options]);

See also: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/pipeThrough

pipe-to cljs

(pipe-to this & args)

Method.

[Experimental]

The pipeTo() method of the web.files.ReadableStream interface the current ReadableStream to a given web.streams.WritableStream returns a promise that fulfills when the piping process completes or rejects if any errors were encountered.

Promise<void> readableStreamInstance.pipeTo(destination[, options]);

See also: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/pipeTo

tee cljs

(tee this)

Method.

The tee() method of the web.files.ReadableStream interface the current readable stream, returning a two-element array containing two resulting branches as new web.files.ReadableStream instances.

readableStreamInstance.tee();

See also: https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/tee