Merge pull request #115 from dangershony/light-wallet-drop-nodes-behind

Checking for segwit activation and adding the behavior to drop nodes …

Breeze/src/Breeze.Wallet/LightWalletFeature.cs

 using Stratis.Bitcoin.Builder.Feature;
 using Microsoft.Extensions.DependencyInjection;
+using NBitcoin;
+using NBitcoin.Protocol;
 using Stratis.Bitcoin.Builder;
+using Stratis.Bitcoin.Connection;
+using Stratis.Bitcoin.Consensus;
+using Stratis.Bitcoin.Consensus.Deployments;
 using Stratis.Bitcoin.Wallet;
 using Stratis.Bitcoin.Wallet.Controllers;
 
@@ -10,17 +15,30 @@ namespace Breeze.Wallet
     {
         private readonly IWalletSyncManager walletSyncManager;
         private readonly IWalletManager walletManager;
+        private readonly IConnectionManager connectionManager;
+        private readonly ConcurrentChain chain;
+        private readonly NodeDeployments nodeDeployments;
 
-        public LightWalletFeature(IWalletSyncManager walletSyncManager, IWalletManager walletManager)
+        public LightWalletFeature(IWalletSyncManager walletSyncManager, IWalletManager walletManager, IConnectionManager connectionManager, 
+            ConcurrentChain chain, NodeDeployments nodeDeployments)
         {
             this.walletSyncManager = walletSyncManager;
             this.walletManager = walletManager;
+            this.connectionManager = connectionManager;
+            this.chain = chain;
+            this.nodeDeployments = nodeDeployments;
         }
 
         public override void Start()
         {
+            this.connectionManager.Parameters.TemplateBehaviors.Add(new DropNodesBehaviour(this.chain, this.connectionManager));
+
             this.walletManager.Initialize();
             this.walletSyncManager.Initialize();
+
+            var flags = this.nodeDeployments.GetFlags(this.walletSyncManager.WalletTip);
+            if (flags.ScriptFlags.HasFlag(ScriptVerify.Witness))
+                this.connectionManager.AddDiscoveredNodesRequirement(NodeServices.NODE_WITNESS);
         }
 
         public override void Stop()

Breeze/src/Breeze.Wallet/LightWalletSyncManager.cs

@@ -23,6 +23,8 @@ namespace Breeze.Wallet
 
         private ChainedBlock walletTip;
 
+        public ChainedBlock WalletTip => this.walletTip;
+
         public LightWalletSyncManager(ILoggerFactory loggerFactory, IWalletManager walletManager, ConcurrentChain chain, Network network,
             BlockNotification blockNotification, Signals signals)
         {
@@ -61,6 +63,7 @@ namespace Breeze.Wallet
                     this.walletManager.RemoveBlocks(fork);
                     this.walletManager.WalletTipHash = fork.HashBlock;
                     this.walletTip = fork;
+                    this.logger.LogWarning($"Wallet tip was out of sync, wallet tip reverted back to Height = {this.walletTip.Height} hash = {this.walletTip.HashBlock}.");
                 }
             }
 
@@ -139,6 +142,7 @@ namespace Breeze.Wallet
 
                     Guard.Assert(fork.HashBlock == block.Header.HashPrevBlock);
                     this.walletManager.RemoveBlocks(fork);
+                    this.logger.LogWarning($"Reorg detected, wallet tip reverted back to Height = {fork.Height} hash = {fork.HashBlock}.");
                 }
                 else
                 {