Merge pull request #578 from zcash/decrease_batches_on_bloated_chain

[#577] Fix: reduce batch size when reaching increased load part of th…

Sources/ZcashLightClientKit/Block/Processor/CompactBlockScanning.swift

@@ -13,7 +13,9 @@ extension CompactBlockProcessor {
         try Task.checkCancellation()
         
         setState(.scanning)
-        let batchSize = UInt32(config.scanningBatchSize)
+
+        // TODO: remove this arbitrary batch size https://github.com/zcash/ZcashLightClientKit/issues/576
+        let batchSize = scanBatchSize(for: range, network: self.config.network.networkType)
         
         do {
             if batchSize == 0 {
@@ -92,6 +94,17 @@ extension CompactBlockProcessor {
             throw error
         }
     }
+
+    fileprivate func scanBatchSize(for range: CompactBlockRange, network: NetworkType) -> UInt32 {
+        guard network == .mainnet else {
+            return UInt32(config.scanningBatchSize)
+        }
+        if range.lowerBound > 1_600_000 {
+            return 5
+        }
+
+        return UInt32(config.scanningBatchSize)
+    }
 }
 
 extension CompactBlockProcessor {

ZcashLightClientKit.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
     s.name             = 'ZcashLightClientKit'
-    s.version          = '0.16.10-beta'
+    s.version          = '0.17.0-alpha.1'
     s.summary          = 'Zcash Light Client wallet SDK for iOS'
   
     s.description      = <<-DESC