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Code comments for how the receieve queue works

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Samuel Mannehed 2019-09-25 21:04:46 +02:00 committed by Lauri Kasanen
parent b0c54f6b24
commit d88aefba4e
1 changed files with 8 additions and 2 deletions
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10
kasmweb/core/websock.js
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@ -226,6 +226,11 @@ export default class Websock {
return new Uint8Array(this._sQ.buffer, 0, this._sQlen); return new Uint8Array(this._sQ.buffer, 0, this._sQlen);
} }
// We want to move all the unread data to the start of the queue,
// e.g. compacting.
// The function also expands the receive que if needed, and for
// performance reasons we combine these two actions to avoid
// unneccessary copying.
_expand_compact_rQ(min_fit) { _expand_compact_rQ(min_fit) {
// if we're using less than 1/8th of the buffer even with the incoming bytes, compact in place // if we're using less than 1/8th of the buffer even with the incoming bytes, compact in place
// instead of resizing // instead of resizing
@ -262,8 +267,8 @@ export default class Websock {
this._rQi = 0; this._rQi = 0;
} }
// push arraybuffer values onto the end of the receive que
_decode_message(data) { _decode_message(data) {
// push arraybuffer values onto the end
const u8 = new Uint8Array(data); const u8 = new Uint8Array(data);
if (u8.length > this._rQbufferSize - this._rQlen) { if (u8.length > this._rQbufferSize - this._rQlen) {
this._expand_compact_rQ(u8.length); this._expand_compact_rQ(u8.length);
@ -276,8 +281,9 @@ export default class Websock {
this._decode_message(e.data); this._decode_message(e.data);
if (this.rQlen > 0) { if (this.rQlen > 0) {
this._eventHandlers.message(); this._eventHandlers.message();
// Compact the receive queue
if (this._rQlen == this._rQi) { if (this._rQlen == this._rQi) {
// All data has now been processed, this means we
// can reset the receive queue.
this._rQlen = 0; this._rQlen = 0;
this._rQi = 0; this._rQi = 0;
} }