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perf: don't continuously attempt to fetch old profiles

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Changelog-Changed: Save bandwidth by only fetching new profiles after a certain amount of time
This commit is contained in:
William Casarin
2023-10-23 10:31:47 +08:00
parent bbccc27a26
commit 76508dbbfd
12 changed files with 86 additions and 48 deletions
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23
damus/Nostr/Profiles.swift
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@@ -30,7 +30,7 @@ class ProfileData {
class Profiles {
private var ndb: Ndb
static let db_freshness_threshold: TimeInterval = 24 * 60 * 60
static let db_freshness_threshold: TimeInterval = 24 * 60 * 8
@MainActor
private var profiles: [Pubkey: ProfileData] = [:]
@@ -93,9 +93,24 @@ class Profiles {
return ndb.lookup_profile_key(pubkey)
}
func has_fresh_profile(id: Pubkey) -> Bool {
guard let recv = lookup_with_timestamp(id).unsafeUnownedValue?.receivedAt else { return false }
return Date.now.timeIntervalSince(Date(timeIntervalSince1970: Double(recv))) < Profiles.db_freshness_threshold
func has_fresh_profile<Y>(id: Pubkey, txn: NdbTxn<Y>) -> Bool {
guard let fetched_at = ndb.read_profile_last_fetched(txn: txn, pubkey: id)
else {
return false
}
// In situations where a batch of profiles was fetched all at once,
// this will reduce the herding of the profile requests
let fuzz = Double.random(in: -60...60)
let threshold = Profiles.db_freshness_threshold + fuzz
let fetch_date = Date(timeIntervalSince1970: Double(fetched_at))
let since = Date.now.timeIntervalSince(fetch_date)
let fresh = since < threshold
//print("fresh = \(fresh): fetch_date \(since) < threshold \(threshold) \(id)")
return fresh
}
}