feat: added headers first sync

bin/bcoin

@@ -43,8 +43,8 @@ for arg in "$@"; do
     --daemon)
       daemon=1
     ;;
-    --spv)
-      cmd='spvnode'
+   --spv)
+        cmd='spvnode'
     ;;
   esac
 done

lib/blockchain/chain.js

@@ -2006,16 +2006,18 @@ class Chain extends AsyncEmitter {
     if (this.options.checkpoints) {
       if (this.height < this.network.lastCheckpoint)
         return;
-    }
-
-    if (this.tip.time < util.now() - this.network.block.maxTipAge)
+    } else if (!this.options.neutrino &&
+      this.tip.time < util.now() - this.network.block.maxTipAge)
       return;
 
     if (!this.hasChainwork())
       return;
 
     this.synced = true;
-    this.emit('full');
+    if (this.options.neutrino)
+      this.emit('headersFull');
+    else
+      this.emit('full');
   }
 
   /**
@@ -2616,6 +2618,7 @@ class ChainOptions {
     this.compression = true;
 
     this.spv = false;
+    this.neutrino = false;
     this.bip91 = false;
     this.bip148 = false;
     this.prune = false;
@@ -2662,6 +2665,11 @@ class ChainOptions {
       this.spv = options.spv;
     }
 
+    if (options.neutrino != null) {
+      assert(typeof options.neutrino === 'boolean');
+      this.neutrino = options.neutrino;
+    }
+
     if (options.prefix != null) {
       assert(typeof options.prefix === 'string');
       this.prefix = options.prefix;

lib/net/peer.js

@@ -1449,12 +1449,18 @@ class Peer extends EventEmitter {
       if (!(this.services & services.NETWORK))
         throw new Error('Peer does not support network services.');
 
+      if (this.options.neutrino) {
+        if (!(this.services & services.NODE_COMPACT_FILTERS)) {
+          throw new Error('Peer does not support Compact Filters.');
+        }
+      }
+
       if (this.options.headers) {
         if (this.version < common.HEADERS_VERSION)
           throw new Error('Peer does not support getheaders.');
       }
 
-      if (this.options.spv) {
+      if (this.options.spv && !this.options.neutrino) {
         if (!(this.services & services.BLOOM))
           throw new Error('Peer does not support BIP37.');
 
@@ -2080,6 +2086,7 @@ class PeerOptions {
     this.agent = common.USER_AGENT;
     this.noRelay = false;
     this.spv = false;
+    this.neutrino = false;
     this.compact = false;
     this.headers = false;
     this.banScore = common.BAN_SCORE;
@@ -2143,6 +2150,11 @@ class PeerOptions {
       this.spv = options.spv;
     }
 
+    if (options.neutrino != null) {
+      assert(typeof options.neutrino === 'boolean');
+      this.neutrino = options.neutrino;
+    }
+
     if (options.compact != null) {
       assert(typeof options.compact === 'boolean');
       this.compact = options.compact;

lib/net/pool.js

@@ -79,6 +79,7 @@ class Pool extends EventEmitter {
     this.pendingRefill = null;
 
     this.checkpoints = false;
+    this.neutrino = false;
     this.headerChain = new List();
     this.headerNext = null;
     this.headerTip = null;
@@ -204,7 +205,7 @@ class Pool extends EventEmitter {
    */
 
   resetChain() {
-    if (!this.options.checkpoints)
+    if (!this.options.checkpoints && !this.options.neutrino)
       return;
 
     this.checkpoints = false;
@@ -213,7 +214,10 @@ class Pool extends EventEmitter {
     this.headerNext = null;
 
     const tip = this.chain.tip;
-
+    if (this.options.neutrino) {
+      this.headerChain.push(new HeaderEntry(tip.hash, tip.height));
+      return;
+    }
     if (tip.height < this.network.lastCheckpoint) {
       this.checkpoints = true;
       this.headerTip = this.getNextTip(tip.height);
@@ -650,7 +654,10 @@ class Pool extends EventEmitter {
       return;
 
     this.syncing = true;
-    this.resync(false);
+    if (this.options.neutrino) {
+      this.startHeadersSync();
+    } else
+      this.resync(false);
   }
 
   /**
@@ -704,6 +711,32 @@ class Pool extends EventEmitter {
     this.compactBlocks.clear();
   }
 
+  /**
+   * Start the headers sync using getHeaders messages.
+   * @private
+   * @return {Promise}
+   */
+
+  async startHeadersSync() {
+    if (!this.syncing)
+      return;
+    let locator;
+    try {
+      locator = await this.chain.getLocator();
+    } catch (e) {
+      this.emit('error', e);
+      return;
+    }
+
+    const peer = this.peers.load;
+    if (!peer) {
+      this.logger.info('No loader peer.');
+      return;
+    }
+    this.chain.synced = false;
+    peer.sendGetHeaders(locator);
+  }
+
   /**
    * Send a sync to each peer.
    * @private
@@ -814,7 +847,10 @@ class Pool extends EventEmitter {
 
     peer.syncing = true;
     peer.blockTime = Date.now();
-
+    if (this.options.neutrino) {
+      peer.sendGetHeaders(locator);
+      return true;
+    }
     if (this.checkpoints) {
       peer.sendGetHeaders(locator, this.headerTip.hash);
       return true;
@@ -2027,6 +2063,9 @@ class Pool extends EventEmitter {
     if (this.options.selfish)
       return;
 
+    if (this.options.neutrino)
+      return;
+
     if (this.chain.options.spv)
       return;
 
@@ -2139,7 +2178,8 @@ class Pool extends EventEmitter {
   async _handleHeaders(peer, packet) {
     const headers = packet.items;
 
-    if (!this.checkpoints)
+    if (!this.checkpoints && !this.options.neutrino)
+      // todo add support for checkpoints
       return;
 
     if (!this.syncing)
@@ -2185,7 +2225,8 @@ class Pool extends EventEmitter {
 
       node = new HeaderEntry(hash, height);
 
-      if (node.height === this.headerTip.height) {
+      if (!this.options.neutrino && node.height === this.headerTip.height) {
+        // todo add support for checkpoints
         if (!node.hash.equals(this.headerTip.hash)) {
           this.logger.warning(
             'Peer sent an invalid checkpoint (%s).',
@@ -2200,6 +2241,8 @@ class Pool extends EventEmitter {
         this.headerNext = node;
 
       this.headerChain.push(node);
+      if (this.options.neutrino)
+        await this._addBlock(peer, header, chainCommon.flags.VERIFY_POW);
     }
 
     this.logger.debug(
@@ -2219,7 +2262,12 @@ class Pool extends EventEmitter {
     }
 
     // Request more headers.
-    peer.sendGetHeaders([node.hash], this.headerTip.hash);
+    if (this.chain.synced)
+      return;
+    if (this.options.neutrino)
+      peer.sendGetHeaders([node.hash]);
+    else
+      peer.sendGetHeaders([node.hash], this.headerTip.hash);
   }
 
   /**
@@ -2293,7 +2341,7 @@ class Pool extends EventEmitter {
 
     const hash = block.hash();
 
-    if (!this.resolveBlock(peer, hash)) {
+    if (!this.options.neutrino && !this.resolveBlock(peer, hash)) {
       this.logger.warning(
         'Received unrequested block: %h (%s).',
         block.hash(), peer.hostname());
@@ -3690,6 +3738,7 @@ class PoolOptions {
     this.prefix = null;
     this.checkpoints = true;
     this.spv = false;
+    this.neutrino = false;
     this.bip37 = false;
     this.bip157 = false;
     this.listen = false;
@@ -3772,12 +3821,19 @@ class PoolOptions {
 
     if (options.spv != null) {
       assert(typeof options.spv === 'boolean');
-      assert(options.spv === this.chain.options.spv);
+      // assert(options.spv === this.chain.options.spv);
       this.spv = options.spv;
     } else {
       this.spv = this.chain.options.spv;
     }
 
+    if (options.neutrino != null) {
+      assert(typeof options.neutrino === 'boolean');
+      this.neutrino = options.neutrino;
+      assert(options.compact === false ||
+        options.compact === undefined, 'We cannot use compact blocks');
+    }
+
     if (options.bip37 != null) {
       assert(typeof options.bip37 === 'boolean');
       this.bip37 = options.bip37;
@@ -3953,6 +4009,12 @@ class PoolOptions {
       this.listen = false;
     }
 
+    if (this.neutrino) {
+      this.requiredServices |= common.services.NODE_COMPACT_FILTERS;
+      this.checkpoints = true;
+      this.compact = false;
+    }
+
     if (this.selfish) {
       this.services &= ~common.services.NETWORK;
       this.bip37 = false;