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Relay: increase broadcast TTL cap in sparse graphs to 6; tighten jitter for handshake (10–35ms) and directed (20–60ms) relays

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jack
2025-08-26 12:17:23 +02:00
parent 744e87f924
commit 86bdb1af27
1 changed files with 6 additions and 3 deletions
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bitchat/Services/RelayController.swift
+6 -3
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@@ -25,7 +25,8 @@ struct RelayController {
// Always relay with no TTL cap for these types // Always relay with no TTL cap for these types
let newTTL = (ttl &- 1) let newTTL = (ttl &- 1)
// Slight jitter to desynchronize without adding too much latency // Slight jitter to desynchronize without adding too much latency
let delayRange: ClosedRange<Int> = isHandshake ? 20...60 : 40...120 // Tighter for faster multi-hop handshakes and directed DMs
let delayRange: ClosedRange<Int> = isHandshake ? 10...35 : 20...60
let delayMs = Int.random(in: delayRange) let delayMs = Int.random(in: delayRange)
return RelayDecision(shouldRelay: true, newTTL: newTTL, delayMs: delayMs) return RelayDecision(shouldRelay: true, newTTL: newTTL, delayMs: delayMs)
} }
@@ -42,8 +43,10 @@ struct RelayController {
let prob = baseProb let prob = baseProb
let shouldRelay = Double.random(in: 0...1) <= prob let shouldRelay = Double.random(in: 0...1) <= prob
// TTL clamping in dense graphs (only for broadcast) // TTL clamping for broadcast
let ttlCap: UInt8 = degree >= highDegreeThreshold ? 3 : 5 // - Dense graphs: keep very low to avoid floods
// - Sparse graphs: allow slightly longer reach for multi-hop discovery
let ttlCap: UInt8 = degree >= highDegreeThreshold ? 3 : 6
let clamped = max(1, min(ttl, ttlCap)) let clamped = max(1, min(ttl, ttlCap))
let newTTL = clamped &- 1 let newTTL = clamped &- 1