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fix merge logic edge-cases with skips

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This commit is contained in:
Kevin Jahns 2021-06-24 15:14:49 +02:00
parent 28d8db86f0
commit 89c5541ee6
1 changed files with 17 additions and 10 deletions
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27
src/utils/updates.js
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@ -154,16 +154,9 @@ export const encodeStateVectorFromUpdateV2 = (update, YEncoder = DSEncoderV2, YD
if (curr !== null) {
let size = 0
let currClient = curr.id.client
let currClock = 0
let stopCounting = curr.id.clock !== 0 // must start at 0
let currClock = stopCounting ? 0 : curr.id.clock + curr.length
for (; curr !== null; curr = updateDecoder.next()) {
// we ignore skips
if (curr.constructor === Skip) {
stopCounting = true
}
if (!stopCounting) {
currClock = curr.id.clock + curr.length
}
if (currClient !== curr.id.client) {
if (currClock !== 0) {
size++
@ -173,7 +166,15 @@ export const encodeStateVectorFromUpdateV2 = (update, YEncoder = DSEncoderV2, YD
encoding.writeVarUint(encoder.restEncoder, currClock)
}
currClient = curr.id.client
stopCounting = false
currClock = 0
stopCounting = curr.id.clock !== 0
}
// we ignore skips
if (curr.constructor === Skip) {
stopCounting = true
}
if (!stopCounting) {
currClock = curr.id.clock + curr.length
}
}
// write what we have
@ -332,13 +333,19 @@ export const mergeUpdatesV2 = (updates, YDecoder = UpdateDecoderV2, YEncoder = U
if (currWrite !== null) {
let curr = /** @type {Item | GC | null} */ (currDecoder.curr)
let iterated = false
// iterate until we find something that we haven't written already
// remember: first the high client-ids are written
while (curr !== null && curr.id.clock + curr.length <= currWrite.struct.id.clock + currWrite.struct.length && curr.id.client >= currWrite.struct.id.client) {
curr = currDecoder.next()
iterated = true
}
if (curr === null || curr.id.client !== firstClient) {
if (
curr === null || // current decoder is empty
curr.id.client !== firstClient || // check whether there is another decoder that has has updates from `firstClient`
(iterated && curr.id.clock > currWrite.struct.id.clock + currWrite.struct.length) // the above while loop was used and we are potentially missing updates
) {
continue
}