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feat: add MojangUtil.queueUsernameForUUID #444

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Queue usernames for UUID lookup and wait until completed

Run usernames in batch by waiting for at least 10? or max 3 seconds

This PR has 44 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!


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Label      : Extra Small
Size       : +44 -0
Percentile : 17.6%

Total files changed: 1

Change summary by file extension:
.kt : +44 -0

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val username = name.lowercase()
usernameQueue.emit(username to System.currentTimeMillis())

return uuidFlow.first { it.first == username }.second
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if 2 queue the same username what will happen?

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It should still emit. Only StateFlow will disregard repeated consecutive elements.

val usernames = ArrayDeque<Pair<String, Long>>(10)
usernameQueue.collect { name ->
usernames.add(name)
if (usernames.size >= 10 || usernames.isNotEmpty() && System.currentTimeMillis() - usernames.first().second >= 3000L) {
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this condition good?

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If you're trying to create what is effectively a bucket ratelimiter, there are probably better ways to handle this (see Levelhead). Otherwise, you'd probably want your usernameQueue flow to have a replay cache (and buffer) of 10 so you can access queued values more than once.
Also, It'd probably be nice to add qualifying parenthesis around the second condition because it's not very straightforward from a glance.

usernameQueue.collect { name ->
usernames.add(name)
if (usernames.size >= 10 || usernames.isNotEmpty() && System.currentTimeMillis() - usernames.first().second >= 3000L) {
getUUIDsFromUsernames(usernames.map { it.first }).forEach {
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would it be better to directly emit the API response?

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Overall looks fine but a few concerns.

val username = name.lowercase()
usernameQueue.emit(username to System.currentTimeMillis())

return uuidFlow.first { it.first == username }.second
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It should still emit. Only StateFlow will disregard repeated consecutive elements.

val usernames = ArrayDeque<Pair<String, Long>>(10)
usernameQueue.collect { name ->
usernames.add(name)
if (usernames.size >= 10 || usernames.isNotEmpty() && System.currentTimeMillis() - usernames.first().second >= 3000L) {
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If you're trying to create what is effectively a bucket ratelimiter, there are probably better ways to handle this (see Levelhead). Otherwise, you'd probably want your usernameQueue flow to have a replay cache (and buffer) of 10 so you can access queued values more than once.
Also, It'd probably be nice to add qualifying parenthesis around the second condition because it's not very straightforward from a glance.

Comment on lines +76 to +81
suspend fun queueUsernameForUUID(name: String): UUID? {
val username = name.lowercase()
usernameQueue.emit(username to System.currentTimeMillis())

return uuidFlow.first { it.first == username }.second
}
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Is there any guarantee that the username will be resolved? Afaict you need to pray someone else calls MojangUtil#getUsernameFromUUID.

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