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# GNU LESSER GENERAL PUBLIC LICENSE
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Version 3, 29 June 2007
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Copyright (C) 2007 Free Software Foundation, Inc.
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<https://fsf.org/>
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Everyone is permitted to copy and distribute verbatim copies of this
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license document, but changing it is not allowed.
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This version of the GNU Lesser General Public License incorporates the
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terms and conditions of version 3 of the GNU General Public License,
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supplemented by the additional permissions listed below.
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## 0. Additional Definitions.
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As used herein, "this License" refers to version 3 of the GNU Lesser
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General Public License, and the "GNU GPL" refers to version 3 of the
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GNU General Public License.
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"The Library" refers to a covered work governed by this License, other
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than an Application or a Combined Work as defined below.
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An "Application" is any work that makes use of an interface provided
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by the Library, but which is not otherwise based on the Library.
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Defining a subclass of a class defined by the Library is deemed a mode
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of using an interface provided by the Library.
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A "Combined Work" is a work produced by combining or linking an
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Application with the Library. The particular version of the Library
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with which the Combined Work was made is also called the "Linked
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Version".
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The "Minimal Corresponding Source" for a Combined Work means the
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Corresponding Source for the Combined Work, excluding any source code
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for portions of the Combined Work that, considered in isolation, are
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based on the Application, and not on the Linked Version.
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The "Corresponding Application Code" for a Combined Work means the
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object code and/or source code for the Application, including any data
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and utility programs needed for reproducing the Combined Work from the
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Application, but excluding the System Libraries of the Combined Work.
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## 1. Exception to Section 3 of the GNU GPL.
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You may convey a covered work under sections 3 and 4 of this License
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without being bound by section 3 of the GNU GPL.
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## 2. Conveying Modified Versions.
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If you modify a copy of the Library, and, in your modifications, a
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facility refers to a function or data to be supplied by an Application
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that uses the facility (other than as an argument passed when the
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facility is invoked), then you may convey a copy of the modified
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version:
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- a) under this License, provided that you make a good faith effort
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to ensure that, in the event an Application does not supply the
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function or data, the facility still operates, and performs
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whatever part of its purpose remains meaningful, or
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- b) under the GNU GPL, with none of the additional permissions of
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this License applicable to that copy.
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## 3. Object Code Incorporating Material from Library Header Files.
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The object code form of an Application may incorporate material from a
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header file that is part of the Library. You may convey such object
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code under terms of your choice, provided that, if the incorporated
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material is not limited to numerical parameters, data structure
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layouts and accessors, or small macros, inline functions and templates
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(ten or fewer lines in length), you do both of the following:
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- a) Give prominent notice with each copy of the object code that
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the Library is used in it and that the Library and its use are
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covered by this License.
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- b) Accompany the object code with a copy of the GNU GPL and this
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license document.
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## 4. Combined Works.
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You may convey a Combined Work under terms of your choice that, taken
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together, effectively do not restrict modification of the portions of
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the Library contained in the Combined Work and reverse engineering for
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debugging such modifications, if you also do each of the following:
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- a) Give prominent notice with each copy of the Combined Work that
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the Library is used in it and that the Library and its use are
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covered by this License.
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- b) Accompany the Combined Work with a copy of the GNU GPL and this
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license document.
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- c) For a Combined Work that displays copyright notices during
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execution, include the copyright notice for the Library among
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these notices, as well as a reference directing the user to the
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copies of the GNU GPL and this license document.
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- d) Do one of the following:
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- 0) Convey the Minimal Corresponding Source under the terms of
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this License, and the Corresponding Application Code in a form
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suitable for, and under terms that permit, the user to
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recombine or relink the Application with a modified version of
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the Linked Version to produce a modified Combined Work, in the
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manner specified by section 6 of the GNU GPL for conveying
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Corresponding Source.
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- 1) Use a suitable shared library mechanism for linking with
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the Library. A suitable mechanism is one that (a) uses at run
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time a copy of the Library already present on the user's
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computer system, and (b) will operate properly with a modified
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version of the Library that is interface-compatible with the
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Linked Version.
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- e) Provide Installation Information, but only if you would
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otherwise be required to provide such information under section 6
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of the GNU GPL, and only to the extent that such information is
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necessary to install and execute a modified version of the
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Combined Work produced by recombining or relinking the Application
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with a modified version of the Linked Version. (If you use option
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4d0, the Installation Information must accompany the Minimal
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Corresponding Source and Corresponding Application Code. If you
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use option 4d1, you must provide the Installation Information in
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the manner specified by section 6 of the GNU GPL for conveying
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Corresponding Source.)
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## 5. Combined Libraries.
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You may place library facilities that are a work based on the Library
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side by side in a single library together with other library
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facilities that are not Applications and are not covered by this
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License, and convey such a combined library under terms of your
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choice, if you do both of the following:
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- a) Accompany the combined library with a copy of the same work
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based on the Library, uncombined with any other library
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facilities, conveyed under the terms of this License.
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- b) Give prominent notice with the combined library that part of it
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is a work based on the Library, and explaining where to find the
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accompanying uncombined form of the same work.
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## 6. Revised Versions of the GNU Lesser General Public License.
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The Free Software Foundation may publish revised and/or new versions
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of the GNU Lesser General Public License from time to time. Such new
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versions will be similar in spirit to the present version, but may
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differ in detail to address new problems or concerns.
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Each version is given a distinguishing version number. If the Library
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as you received it specifies that a certain numbered version of the
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GNU Lesser General Public License "or any later version" applies to
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it, you have the option of following the terms and conditions either
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of that published version or of any later version published by the
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Free Software Foundation. If the Library as you received it does not
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specify a version number of the GNU Lesser General Public License, you
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may choose any version of the GNU Lesser General Public License ever
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published by the Free Software Foundation.
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If the Library as you received it specifies that a proxy can decide
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whether future versions of the GNU Lesser General Public License shall
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apply, that proxy's public statement of acceptance of any version is
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permanent authorization for you to choose that version for the
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Library.
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@ -0,0 +1,7 @@
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# jsStreams
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Go library to communicate with the JS Stream API by bridging the JS ReadableStream object to a Go io.ReaderCloser.
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[](https://goreportcard.com/report/git.ailur.dev/ailur/jsStreams) [](https://pkg.go.dev/git.ailur.dev/ailur/jsStreams)
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The API is pretty self-explanatory - it provides a function to create an io.ReaderCloser from a JS ReadableStream object.
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@ -0,0 +1,83 @@
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package jsStreams
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import (
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"errors"
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"fmt"
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"sync"
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"syscall/js"
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)
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// ReadableStream implements io.ReaderCloser for a JavaScript ReadableStream.
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type ReadableStream struct {
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stream js.Value
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reader js.Value
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lock sync.Mutex
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}
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// Read reads up to len(p) bytes into p. It returns the number of bytes read (0 <= n <= len(p)) and any error encountered.
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// This implementation of Read does not use scratch space if n < len(p). If some data is available but not len(p) bytes,
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// Read conventionally returns what is available instead of waiting for more. Note: Read will block until data is available,
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// meaning in a WASM environment, you **must** use a goroutine to call Read.
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func (r *ReadableStream) Read(inputBytes []byte) (n int, err error) {
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defer func() {
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recovered := recover()
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if recovered != nil {
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err = fmt.Errorf("panic: %v", recovered)
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}
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}()
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r.lock.Lock()
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var waitGroup sync.WaitGroup
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waitGroup.Add(1)
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if r.reader.IsUndefined() {
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r.reader = r.stream.Call("getReader", map[string]interface{}{"mode": "byob"})
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}
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resultBuffer := js.Global().Get("Uint8Array").New(len(inputBytes))
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readResult := r.reader.Call("read", resultBuffer)
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readResult.Call("then", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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defer waitGroup.Done()
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data := args[0].Get("value")
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js.CopyBytesToGo(inputBytes, data)
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if args[0].Get("done").Bool() {
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err = errors.New("EOF")
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}
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n = data.Length()
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return nil
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}))
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readResult.Call("catch", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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defer waitGroup.Done()
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err = errors.New(args[0].Get("message").String())
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return nil
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}))
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waitGroup.Wait()
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return n, err
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}
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// Close closes the ReadableStream. If the stream is already closed, Close does nothing.
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// If the stream is not yet closed, it is canceled. The reader is closed and the underlying source or pipeline is terminated.
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// This method is idempotent, meaning that it can be called multiple times without causing an error.
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func (r *ReadableStream) Close() (err error) {
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defer func() {
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recovered := recover()
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if recovered != nil {
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err = fmt.Errorf("panic: %v", recovered)
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}
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}()
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if !r.reader.IsUndefined() {
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r.reader.Call("cancel")
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}
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return nil
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}
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func NewReadableStream(stream js.Value) *ReadableStream {
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return &ReadableStream{stream: stream}
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}
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