.gitignore

@@ -12,5 +12,3 @@ builtins
 lws_source
 lws_build
 *.profraw
-*.der
-/.editor_settings

README.md

@@ -11,9 +11,7 @@ We recommend using a link to a zip file of a [specific release](https://github.c
 
 ## API reference
 
-https://defold.com/extension-websocket/
+https://defold.com/extension-websocket/api/
-
-https://defold.com/extension-websocket/websocket_api/
 
 ## Debugging
 

docs/index.md

@@ -72,3 +72,7 @@ socket_timeout = 10000000
 ## Source code
 
 The source code is available on [GitHub](https://github.com/defold/extension-websocket)
+
+## API reference
+
+https://defold.com/extension-websocket/api/

websocket/ext.manifest

@@ -6,7 +6,3 @@ platforms:
         context:
             includes:   ["upload/websocket/include/wslay"]
             defines:    ["HAVE_CONFIG_H"]
-
-    web:
-        context:
-            linkFlags:  ["-lwebsocket.js"]

websocket/include/emscripten/websocket.h

@@ -0,0 +1,136 @@
+/*
+ * Copyright 2018 The Emscripten Authors.  All rights reserved.
+ * Emscripten is available under two separate licenses, the MIT license and the
+ * University of Illinois/NCSA Open Source License.  Both these licenses can be
+ * found in the LICENSE file.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <memory.h>
+
+#include <emscripten/emscripten.h>
+#include <emscripten/html5.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define EMSCRIPTEN_WEBSOCKET_T int
+
+// Returns the WebSocket.readyState field into readyState. readyState must not be a null pointer.
+EMSCRIPTEN_RESULT emscripten_websocket_get_ready_state(EMSCRIPTEN_WEBSOCKET_T socket, unsigned short *readyState);
+
+// Returns the WebSocket.bufferedAmount field into bufferedAmount. bufferedAmount must not be a null pointer.
+EMSCRIPTEN_RESULT emscripten_websocket_get_buffered_amount(EMSCRIPTEN_WEBSOCKET_T socket, unsigned long long *bufferedAmount);
+
+// Writes the WebSocket.url field as a UTF-8 string to the memory area pointed by url. The memory area must contain at least urlLength bytes of free space. If this memory area cannot
+// fit the url string, it will be truncated. Call emscripten_websocket_get_url_length() to determine how large memory area will be required to store the url.
+// url must not be a null pointer.
+EMSCRIPTEN_RESULT emscripten_websocket_get_url(EMSCRIPTEN_WEBSOCKET_T socket, char *url, int urlLength);
+// Returns the byte length needed to store WebSocket.url string in Wasm heap. This length can be passed to emscripten_websocket_get_url as it includes the null byte in the count.
+// urlLength must not be a null pointer.
+EMSCRIPTEN_RESULT emscripten_websocket_get_url_length(EMSCRIPTEN_WEBSOCKET_T socket, int *urlLength);
+
+// Similar to emscripten_websocket_get_url(), but returns WebSocket.extensions field instead.
+EMSCRIPTEN_RESULT emscripten_websocket_get_extensions(EMSCRIPTEN_WEBSOCKET_T socket, char *extensions, int extensionsLength);
+EMSCRIPTEN_RESULT emscripten_websocket_get_extensions_length(EMSCRIPTEN_WEBSOCKET_T socket, int *extensionsLength);
+
+// Similar to emscripten_websocket_get_url(), but returns WebSocket.protocol field instead.
+EMSCRIPTEN_RESULT emscripten_websocket_get_protocol(EMSCRIPTEN_WEBSOCKET_T socket, char *protocol, int protocolLength);
+EMSCRIPTEN_RESULT emscripten_websocket_get_protocol_length(EMSCRIPTEN_WEBSOCKET_T socket, int *protocolLength);
+
+typedef struct EmscriptenWebSocketOpenEvent {
+  EMSCRIPTEN_WEBSOCKET_T socket;
+} EmscriptenWebSocketOpenEvent;
+
+typedef EM_BOOL (*em_websocket_open_callback_func)(int eventType, const EmscriptenWebSocketOpenEvent *websocketEvent, void *userData);
+EMSCRIPTEN_RESULT emscripten_websocket_set_onopen_callback_on_thread(EMSCRIPTEN_WEBSOCKET_T socket, void *userData, em_websocket_open_callback_func callback, pthread_t targetThread);
+
+typedef struct EmscriptenWebSocketMessageEvent {
+  EMSCRIPTEN_WEBSOCKET_T socket;
+  uint8_t *data;
+  uint32_t numBytes;
+  EM_BOOL isText;
+} EmscriptenWebSocketMessageEvent;
+
+typedef EM_BOOL (*em_websocket_message_callback_func)(int eventType, const EmscriptenWebSocketMessageEvent *websocketEvent, void *userData);
+EMSCRIPTEN_RESULT emscripten_websocket_set_onmessage_callback_on_thread(EMSCRIPTEN_WEBSOCKET_T socket, void *userData, em_websocket_message_callback_func callback, pthread_t targetThread);
+
+typedef struct EmscriptenWebSocketErrorEvent {
+  EMSCRIPTEN_WEBSOCKET_T socket;
+} EmscriptenWebSocketErrorEvent;
+
+typedef EM_BOOL (*em_websocket_error_callback_func)(int eventType, const EmscriptenWebSocketErrorEvent *websocketEvent, void *userData);
+EMSCRIPTEN_RESULT emscripten_websocket_set_onerror_callback_on_thread(EMSCRIPTEN_WEBSOCKET_T socket, void *userData, em_websocket_error_callback_func callback, pthread_t targetThread);
+
+typedef struct EmscriptenWebSocketCloseEvent {
+  EMSCRIPTEN_WEBSOCKET_T socket;
+  EM_BOOL wasClean;
+  unsigned short code;
+  char reason[512]; // WebSockets spec enforces this can be max 123 characters, so as UTF-8 at most 123*4 bytes < 512.
+} EmscriptenWebSocketCloseEvent;
+
+typedef EM_BOOL (*em_websocket_close_callback_func)(int eventType, const EmscriptenWebSocketCloseEvent *websocketEvent, void *userData);
+EMSCRIPTEN_RESULT emscripten_websocket_set_onclose_callback_on_thread(EMSCRIPTEN_WEBSOCKET_T socket, void *userData, em_websocket_close_callback_func callback, pthread_t targetThread);
+
+#define emscripten_websocket_set_onopen_callback(socket, userData, callback)    emscripten_websocket_set_onopen_callback_on_thread(   (socket), (userData), (callback), EM_CALLBACK_THREAD_CONTEXT_CALLING_THREAD)
+#define emscripten_websocket_set_onerror_callback(socket, userData, callback)   emscripten_websocket_set_onerror_callback_on_thread(  (socket), (userData), (callback), EM_CALLBACK_THREAD_CONTEXT_CALLING_THREAD)
+#define emscripten_websocket_set_onclose_callback(socket, userData, callback)   emscripten_websocket_set_onclose_callback_on_thread(  (socket), (userData), (callback), EM_CALLBACK_THREAD_CONTEXT_CALLING_THREAD)
+#define emscripten_websocket_set_onmessage_callback(socket, userData, callback) emscripten_websocket_set_onmessage_callback_on_thread((socket), (userData), (callback), EM_CALLBACK_THREAD_CONTEXT_CALLING_THREAD)
+
+typedef struct EmscriptenWebSocketCreateAttributes {
+  // The target URL to connect to. This string can point to a stack local variable, the string is read immediately at a call to emscripten_websocket_new().
+  const char *url;
+  // A comma-separated list of protocol strings. Set to e.g. "binary,base64" to create a WebSocket connection with two supported protocols "binary" and "base64".
+  // Be careful to avoid leading and trailing spaces, e.g. "binary, base64" may not be interpreted properly.
+  // This string can point to a stack local variable, the string is read immediately at a call to emscripten_websocket_new().
+  const char *protocols;
+
+  // If true, the created socket will reside on the main browser thread. If false, the created socket is bound to the calling thread.
+  // If you want to share the created EMSCRIPTEN_WEBSOCKET_T structure across multiple threads, or are running your own main loop in the
+  // pthread that you create the socket, set createOnMainThread to true. If the created WebSocket only needs to be accessible on the thread
+  // that created it, and the creating thread is an event based thread (meaning it regularly yields back to the browser event loop), then
+  // it is more efficient to set this to false.
+  EM_BOOL createOnMainThread;
+} EmscriptenWebSocketCreateAttributes;
+
+//extern void emscripten_websocket_init_create_attributes(EmscriptenWebSocketCreateAttributes *attributes);
+#define emscripten_websocket_init_create_attributes(attributes) do { memset((attributes), 0, sizeof(EmscriptenWebSocketCreateAttributes)); } while(0)
+
+// Returns true if WebSockets are supported by the current browser
+EM_BOOL emscripten_websocket_is_supported(void);
+
+// Creates a new WebSocket and connects it to the given remote host.
+// If the return value of this function is > 0, the function has succeeded and the return value represents a handle to the WebSocket object.
+// If the return value of this function is < 0, then the function has failed, and the return value can be interpreted as a EMSCRIPTEN_RESULT code
+// representing the cause of the failure. If the function returns 0, then the call has failed with an unknown reason (build with -s WEBSOCKET_DEBUG=1 for more information)
+EMSCRIPTEN_WEBSOCKET_T emscripten_websocket_new(EmscriptenWebSocketCreateAttributes *createAttributes);
+
+// Sends the given string of null-delimited UTF8 encoded text data to the connected server.
+EMSCRIPTEN_RESULT emscripten_websocket_send_utf8_text(EMSCRIPTEN_WEBSOCKET_T socket, const char *textData);
+
+// Sends the given block of raw memory data out to the connected server.
+EMSCRIPTEN_RESULT emscripten_websocket_send_binary(EMSCRIPTEN_WEBSOCKET_T socket, void *binaryData, uint32_t dataLength);
+
+// Closes the specified WebSocket. N.B.: the meaning of "closing" a WebSocket means "eager read/lazy write"-closing the socket. That is, all still
+// pending untransferred outbound bytes will continue to transfer out, but after calling close on the socket, any pending bytes still in the process
+// of being received will never be available. See https://html.spec.whatwg.org/multipage/web-sockets.html#dom-websocket-sclose
+// After calling close(), it is no longer possible to send() on the WebSocket to send more bytes.
+EMSCRIPTEN_RESULT emscripten_websocket_close(EMSCRIPTEN_WEBSOCKET_T socket, unsigned short code, const char *reason);
+
+// Releases the given WebSocket object and all associated allocated memory for garbage collection. This effectively frees the socket handle, after calling
+// this function the given handle no longer exists.
+EMSCRIPTEN_RESULT emscripten_websocket_delete(EMSCRIPTEN_WEBSOCKET_T socket);
+
+// This function close()s and releases all created WebSocket connections for the current thread. You can call this at application exit time to enforce
+// teardown of all active sockets, although it is optional. When a pthread terminates, it will call this function to delete all active connections bound to
+// that specific pthread (sockets created with createOnMainThread=false). Any WebSockets created by a pthread with createOnMainThread=true will remain alive
+// even after the pthread quits, although be warned that if the target thread that was registered to handle events for a given WebSocket quits, then those
+// events will stop from being delivered altogether.
+void emscripten_websocket_deinitialize(void);
+
+#ifdef __cplusplus
+} // ~extern "C"
+#endif

websocket/lib/web/library_websocket.js

@@ -0,0 +1,448 @@
+/**
+ * @license
+ * Copyright 2018 The Emscripten Authors
+ * SPDX-License-Identifier: MIT
+ */
+
+var LibraryWebSocket = {
+  $WS: {
+    sockets: [null],
+    socketEvent: null
+  },
+
+  emscripten_websocket_get_ready_state__deps: ['$WS'],
+  emscripten_websocket_get_ready_state__proxy: 'sync',
+  emscripten_websocket_get_ready_state__sig: 'iii',
+  emscripten_websocket_get_ready_state: function(socketId, readyState) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_get_ready_state(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+    {{{ makeSetValue('readyState', '0', 'socket.readyState', 'i16') }}};
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_get_buffered_amount__deps: ['$WS'],
+  emscripten_websocket_get_buffered_amount__proxy: 'sync',
+  emscripten_websocket_get_buffered_amount__sig: 'iii',
+  emscripten_websocket_get_buffered_amount: function(socketId, bufferedAmount) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_get_buffered_amount(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+    {{{ makeSetValue('bufferedAmount', '0', 'socket.bufferedAmount', 'i64') }}};
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_get_extensions__deps: ['$WS'],
+  emscripten_websocket_get_extensions__proxy: 'sync',
+  emscripten_websocket_get_extensions__sig: 'iiii',
+  emscripten_websocket_get_extensions: function(socketId, extensions, extensionsLength) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_get_extensions(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+    if (!extensions) return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_PARAM') }}};
+    stringToUTF8(socket.extensions, extensions, extensionsLength);
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_get_extensions_length__deps: ['$WS'],
+  emscripten_websocket_get_extensions_length__proxy: 'sync',
+  emscripten_websocket_get_extensions_length__sig: 'iii',
+  emscripten_websocket_get_extensions_length: function(socketId, extensionsLength) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_get_extensions_length(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+    if (!extensionsLength) return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_PARAM') }}};
+    {{{ makeSetValue('extensionsLength', '0', 'lengthBytesUTF8(socket.extensions)+1', 'i32') }}};
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_get_protocol__deps: ['$WS'],
+  emscripten_websocket_get_protocol__proxy: 'sync',
+  emscripten_websocket_get_protocol__sig: 'iiii',
+  emscripten_websocket_get_protocol: function(socketId, protocol, protocolLength) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_get_protocol(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+    if (!protocol) return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_PARAM') }}};
+    stringToUTF8(socket.protocol, protocol, protocolLength);
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_get_protocol_length__deps: ['$WS'],
+  emscripten_websocket_get_protocol_length__proxy: 'sync',
+  emscripten_websocket_get_protocol_length__sig: 'iii',
+  emscripten_websocket_get_protocol_length: function(socketId, protocolLength) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_get_protocol_length(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+    if (!protocolLength) return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_PARAM') }}};
+    {{{ makeSetValue('protocolLength', '0', 'lengthBytesUTF8(socket.protocol)+1', 'i32') }}};
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_get_url__deps: ['$WS'],
+  emscripten_websocket_get_url__proxy: 'sync',
+  emscripten_websocket_get_url__sig: 'iiii',
+  emscripten_websocket_get_url: function(socketId, url, urlLength) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_get_url(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+    if (!url) return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_PARAM') }}};
+    stringToUTF8(socket.url, url, urlLength);
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_get_url_length__deps: ['$WS'],
+  emscripten_websocket_get_url_length__proxy: 'sync',
+  emscripten_websocket_get_url_length__sig: 'iii',
+  emscripten_websocket_get_url_length: function(socketId, urlLength) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_get_url_length(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+    if (!urlLength) return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_PARAM') }}};
+    {{{ makeSetValue('urlLength', '0', 'lengthBytesUTF8(socket.url)+1', 'i32') }}};
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_set_onopen_callback_on_thread__deps: ['$WS'],
+  emscripten_websocket_set_onopen_callback_on_thread__proxy: 'sync',
+  emscripten_websocket_set_onopen_callback_on_thread__sig: 'iiiii',
+  emscripten_websocket_set_onopen_callback_on_thread: function(socketId, userData, callbackFunc, thread) {
+// TODO:
+//    if (thread == {{{ cDefine('EM_CALLBACK_THREAD_CONTEXT_CALLING_THREAD') }}} ||
+//      (thread == _pthread_self()) return emscripten_websocket_set_onopen_callback_on_calling_thread(socketId, userData, callbackFunc);
+
+    if (!WS.socketEvent) WS.socketEvent = _malloc(1024); // TODO: sizeof(EmscriptenWebSocketCloseEvent), which is the largest event struct
+
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_set_onopen_callback(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_set_onopen_callback(socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
+#endif
+    socket.onopen = function(e) {
+#if WEBSOCKET_DEBUG
+      console.error('websocket event "open": socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
+#endif
+      HEAPU32[WS.socketEvent>>2] = socketId;
+      {{{ makeDynCall('iiii', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
+    }
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_set_onerror_callback_on_thread__deps: ['$WS'],
+  emscripten_websocket_set_onerror_callback_on_thread__proxy: 'sync',
+  emscripten_websocket_set_onerror_callback_on_thread__sig: 'iiiii',
+  emscripten_websocket_set_onerror_callback_on_thread: function(socketId, userData, callbackFunc, thread) {
+    if (!WS.socketEvent) WS.socketEvent = _malloc(1024); // TODO: sizeof(EmscriptenWebSocketCloseEvent), which is the largest event struct
+
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_set_onerror_callback(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_set_onerror_callback(socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
+#endif
+    socket.onerror = function(e) {
+#if WEBSOCKET_DEBUG
+      console.error('websocket event "error": socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
+#endif
+      HEAPU32[WS.socketEvent>>2] = socketId;
+      {{{ makeDynCall('iiii', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
+    }
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_set_onclose_callback_on_thread__deps: ['$WS'],
+  emscripten_websocket_set_onclose_callback_on_thread__proxy: 'sync',
+  emscripten_websocket_set_onclose_callback_on_thread__sig: 'iiiii',
+  emscripten_websocket_set_onclose_callback_on_thread: function(socketId, userData, callbackFunc, thread) {
+    if (!WS.socketEvent) WS.socketEvent = _malloc(1024); // TODO: sizeof(EmscriptenWebSocketCloseEvent), which is the largest event struct
+
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_set_onclose_callback(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_set_onclose_callback(socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
+#endif
+    socket.onclose = function(e) {
+#if WEBSOCKET_DEBUG
+      console.error('websocket event "close": socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
+#endif
+      HEAPU32[WS.socketEvent>>2] = socketId;
+      HEAPU32[(WS.socketEvent+4)>>2] = e.wasClean;
+      HEAPU32[(WS.socketEvent+8)>>2] = e.code;
+      stringToUTF8(e.reason, HEAPU32[(WS.socketEvent+10)>>2], 512);
+      {{{ makeDynCall('iiii', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
+    }
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_set_onmessage_callback_on_thread__deps: ['$WS'],
+  emscripten_websocket_set_onmessage_callback_on_thread__proxy: 'sync',
+  emscripten_websocket_set_onmessage_callback_on_thread__sig: 'iiiii',
+  emscripten_websocket_set_onmessage_callback_on_thread: function(socketId, userData, callbackFunc, thread) {
+    if (!WS.socketEvent) WS.socketEvent = _malloc(1024); // TODO: sizeof(EmscriptenWebSocketCloseEvent), which is the largest event struct
+
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_set_onmessage_callback(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_set_onmessage_callback(socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
+#endif
+    socket.onmessage = function(e) {
+#if WEBSOCKET_DEBUG == 2
+      console.error('websocket event "message": socketId='+socketId+',userData='+userData+',callbackFunc='+callbackFunc+')');
+#endif
+      HEAPU32[WS.socketEvent>>2] = socketId;
+      if (typeof e.data === 'string') {
+        var len = lengthBytesUTF8(e.data)+1;
+        var buf = _malloc(len);
+        stringToUTF8(e.data, buf, len);
+#if WEBSOCKET_DEBUG
+        var s = (e.data.length < 256) ? e.data : (e.data.substr(0, 256) + ' (' + (e.data.length-256) + ' more characters)');
+        console.error('WebSocket onmessage, received data: "' + e.data + '", ' + e.data.length + ' chars, ' + len + ' bytes encoded as UTF-8: "' + s + '"');
+#endif
+        HEAPU32[(WS.socketEvent+12)>>2] = 1; // text data
+      } else {
+        var len = e.data.byteLength;
+        var buf = _malloc(len);
+        HEAP8.set(new Uint8Array(e.data), buf);
+#if WEBSOCKET_DEBUG
+        var s = 'WebSocket onmessage, received data: ' + len + ' bytes of binary:';
+        for(var i = 0; i < Math.min(len, 256); ++i) s += ' ' + HEAPU8[buf+i].toString(16);
+        s += ', "';
+        for(var i = 0; i < Math.min(len, 256); ++i) s += (HEAPU8[buf+i] >= 32 && HEAPU8[buf+i] <= 127) ? String.fromCharCode(HEAPU8[buf+i]) : '\uFFFD';
+        s += '"';
+        if (len > 256) s + ' ... (' + (len - 256) + ' more bytes)';
+
+        console.error(s);
+#endif
+        HEAPU32[(WS.socketEvent+12)>>2] = 0; // binary data
+      }
+      HEAPU32[(WS.socketEvent+4)>>2] = buf;
+      HEAPU32[(WS.socketEvent+8)>>2] = len;
+      {{{ makeDynCall('iiii', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
+      _free(buf);
+    }
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_new__deps: ['$WS'],
+  emscripten_websocket_new__proxy: 'sync',
+  emscripten_websocket_new__sig: 'ii',
+  emscripten_websocket_new: function(createAttributes) {
+    if (typeof WebSocket === 'undefined') {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_new(): WebSocket API is not supported by current browser)');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_NOT_SUPPORTED') }}};
+    }
+    if (!createAttributes) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_new(): Missing required "createAttributes" function parameter!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_PARAM') }}};
+    }
+
+    var createAttrs = createAttributes>>2;
+    var url = UTF8ToString(HEAP32[createAttrs]);
+    var protocols = HEAP32[createAttrs+1];
+    // TODO: Add support for createOnMainThread==false; currently all WebSocket connections are created on the main thread.
+    // var createOnMainThread = HEAP32[createAttrs+2];
+
+    var socket = protocols ? new WebSocket(url, UTF8ToString(protocols).split(',')) : new WebSocket(url);
+    // We always marshal received WebSocket data back to Wasm, so enable receiving the data as arraybuffers for easy marshalling.
+    socket.binaryType = 'arraybuffer';
+    // TODO: While strictly not necessary, this ID would be good to be unique across all threads to avoid confusion.
+    var socketId = WS.sockets.length;
+    WS.sockets[socketId] = socket;
+
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_new(url='+url+', protocols=' + (protocols?UTF8ToString(protocols).split(','):'null') + '): created socket ID ' + socketId + ')');
+#endif
+    return socketId;
+  },
+
+  emscripten_websocket_send_utf8_text__deps: ['$WS'],
+  emscripten_websocket_send_utf8_text__proxy: 'sync',
+  emscripten_websocket_send_utf8_text__sig: 'iii',
+  emscripten_websocket_send_utf8_text: function(socketId, textData) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_send_utf8_text(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+    var str = UTF8ToString(textData);
+#if WEBSOCKET_DEBUG == 2
+    console.error('emscripten_websocket_send_utf8_text(socketId='+socketId+',textData='+ str.length + ' chars, "' + str +'")');
+#else
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_send_utf8_text(socketId='+socketId+',textData='+ str.length + ' chars, "' + ((str.length > 8) ? (str.substring(0,8) + '...') : str) + '")');
+#endif
+#endif
+    socket.send(str);
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_send_binary__deps: ['$WS'],
+  emscripten_websocket_send_binary__proxy: 'sync',
+  emscripten_websocket_send_binary__sig: 'iiii',
+  emscripten_websocket_send_binary: function(socketId, binaryData, dataLength) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_send_binary(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+#if WEBSOCKET_DEBUG
+    var s = 'data: ' + dataLength + ' bytes of binary:';
+    for(var i = 0; i < Math.min(dataLength, 256); ++i) s += ' '+ HEAPU8[binaryData+i].toString(16);
+    s += ', "';
+    for(var i = 0; i < Math.min(dataLength, 256); ++i) s += (HEAPU8[binaryData+i] >= 32 && HEAPU8[binaryData+i] <= 127) ? String.fromCharCode(HEAPU8[binaryData+i]) : '\uFFFD';
+    s += '"';
+    if (dataLength > 256) s + ' ... (' + (dataLength - 256) + ' more bytes)';
+
+    console.error('emscripten_websocket_send_binary(socketId='+socketId+',binaryData='+binaryData+ ',dataLength='+dataLength+'), ' + s);
+#endif
+#if USE_PTHREADS
+    // TODO: This is temporary to cast a shared Uint8Array to a non-shared Uint8Array. This could be removed if WebSocket API is improved
+    // to allow passing in views to SharedArrayBuffers
+    socket.send(new Uint8Array({{{ makeHEAPView('U8', 'binaryData', 'binaryData+dataLength') }}}));
+#else
+    socket.send({{{ makeHEAPView('U8', 'binaryData', 'binaryData+dataLength') }}});
+#endif
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_close__deps: ['$WS'],
+  emscripten_websocket_close__proxy: 'sync',
+  emscripten_websocket_close__sig: 'iiii',
+  emscripten_websocket_close: function(socketId, code, reason) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_close(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+    var reasonStr = reason ? UTF8ToString(reason) : undefined;
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_close(socketId='+socketId+',code='+code+',reason='+reasonStr+')');
+#endif
+    // According to WebSocket specification, only close codes that are recognized have integer values
+    // 1000-4999, with 3000-3999 and 4000-4999 denoting user-specified close codes:
+    // https://developer.mozilla.org/en-US/docs/Web/API/CloseEvent#Status_codes
+    // Therefore be careful to call the .close() function with exact number and types of parameters.
+    // Coerce code==0 to undefined, since Wasm->JS call can only marshal integers, and 0 is not allowed.
+    if (reason) socket.close(code || undefined, UTF8ToString(reason));
+    else if (code) socket.close(code);
+    else socket.close();
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_delete__deps: ['$WS'],
+  emscripten_websocket_delete__proxy: 'sync',
+  emscripten_websocket_delete__sig: 'ii',
+  emscripten_websocket_delete: function(socketId) {
+    var socket = WS.sockets[socketId];
+    if (!socket) {
+#if WEBSOCKET_DEBUG
+      console.error('emscripten_websocket_delete(): Invalid socket ID ' + socketId + ' specified!');
+#endif
+      return {{{ cDefine('EMSCRIPTEN_RESULT_INVALID_TARGET') }}};
+    }
+
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_delete(socketId='+socketId+')');
+#endif
+    socket.onopen = socket.onerror = socket.onclose = socket.onmessage = null;
+    delete WS.sockets[socket];
+    return {{{ cDefine('EMSCRIPTEN_RESULT_SUCCESS') }}};
+  },
+
+  emscripten_websocket_is_supported__proxy: 'sync',
+  emscripten_websocket_is_supported__sig: 'i',
+  emscripten_websocket_is_supported: function() {
+    return typeof WebSocket !== 'undefined';
+  },
+
+  emscripten_websocket_deinitialize__deps: ['$WS'],
+  emscripten_websocket_deinitialize__proxy: 'sync',
+  emscripten_websocket_deinitialize__sig: 'v',
+  emscripten_websocket_deinitialize__deps: ['emscripten_websocket_delete'],
+  emscripten_websocket_deinitialize: function() {
+#if WEBSOCKET_DEBUG
+    console.error('emscripten_websocket_deinitialize()');
+#endif
+    for(var i in WS.sockets) {
+      var socket = WS.sockets[i];
+      if (socket) {
+        socket.close();
+        _emscripten_websocket_delete(i);
+      }
+    }
+    WS.sockets = [];
+  }
+}
+
+mergeInto(LibraryManager.library, LibraryWebSocket);

websocket/src/websocket.h

@@ -16,7 +16,7 @@
     #endif
 
 #if defined(__EMSCRIPTEN__)
-#include <emscripten/websocket.h> 
+#include "emscripten/websocket.h"
 #endif
 
 #include <dmsdk/dlib/connection_pool.h>