mempool: invalidate claims when the claim period ends.

lib/mempool/mempool.js

@@ -202,6 +202,7 @@ class Mempool extends EventEmitter {
    */
 
   async _addBlock(block, txs, view) {
+    const nextHeight = block.height + 1;
     const entries = [];
     const cb = txs[0];
 
@@ -284,6 +285,12 @@ class Mempool extends EventEmitter {
         this.untrackClaim(entry);
     }
 
+    // At the chain.tip.height of claimPeriod - 1, we no longer
+    // accept new claims as they will be invalid in the next block.
+    // We also need to clean them up from the mempool.
+    if (nextHeight === this.network.names.claimPeriod)
+      this.dropClaims();
+
     // Remove all GooSig based airdrops from the mempool
     // when the block one before the height that disables
     // GooSig is added to the mempool to prevent the

test/mempool-invalidation-test.js

@@ -0,0 +1,165 @@
+'use strict';
+
+const assert = require('bsert');
+const {BufferMap} = require('buffer-map');
+const Network = require('../lib/protocol/network');
+const FullNode = require('../lib/node/fullnode');
+const ownership = require('../lib/covenants/ownership');
+const rules = require('../lib/covenants/rules');
+const {forEvent} = require('./util/common');
+
+const network = Network.get('regtest');
+const {
+  treeInterval,
+  claimPeriod
+} = network.names;
+
+const ACTUAL_CLAIM_PERIOD = claimPeriod;
+
+describe('Mempool Invalidation', function() {
+  const NAMES = [
+    // roots
+    'nl',
+
+    // top 100
+    'paypal',
+
+    // custom
+    'cloudflare',
+
+    // other
+    'steamdb'
+  ];
+
+  describe('Claim Invalidation (Integration)', function() {
+    this.timeout(50000);
+
+    let node, wallet;
+
+    // copy names
+    const TEST_CLAIMS = NAMES.slice();
+
+    before(async () => {
+      node = new FullNode({
+        memory: true,
+        network: network.type,
+        plugins: [require('../lib/wallet/plugin')]
+      });
+
+      await node.ensure();
+      await node.open();
+
+      // Ignore claim validation
+      ownership.ignore = true;
+
+      const walletPlugin = node.require('walletdb');
+      const wdb = walletPlugin.wdb;
+      wallet = await wdb.get('primary');
+
+      const addr = await wallet.receiveAddress('default');
+      node.miner.addAddress(addr.toString());
+
+      // first interval maturity
+      // second interval mine claim
+      network.names.claimPeriod = treeInterval * 3;
+
+      // third interval last block should invalidate.
+    });
+
+    after(async () => {
+      network.names.claimPeriod = ACTUAL_CLAIM_PERIOD;
+
+      await node.close();
+    });
+
+    it('should mine an interval', async () => {
+      for (let i = 0; i < treeInterval; i++)
+        await mineBlock(node);
+    });
+
+    it('should mine claims before claimPeriod timeout', async () => {
+      const name = TEST_CLAIMS.shift();
+
+      const claim = await wallet.makeFakeClaim(name);
+      let block;
+
+      await node.mempool.insertClaim(claim);
+      assert.strictEqual(node.mempool.claims.size, 1);
+
+      // retain claim in mempool.
+      block = await mineBlock(node, { ignoreClaims: true });
+      assert.strictEqual(node.mempool.claims.size, 1);
+      assert.strictEqual(block.txs[0].outputs.length, 1);
+
+      // Now we can mine it.
+      block = await mineBlock(node);
+      assert.strictEqual(node.mempool.claims.size, 0);
+      assert.strictEqual(block.txs[0].outputs.length, 2);
+      assert.strictEqual(block.txs[0].outputs[1].covenant.type, rules.types.CLAIM);
+    });
+
+    it('should invalidate claim after claimPeriod timeout', async () => {
+      const name = TEST_CLAIMS.shift();
+      const claim = await wallet.makeFakeClaim(name);
+
+      let block = null;
+
+      // Mempool treats txs in it as if they were mined in the next block,
+      // so we need next block to still be valid.
+      while (node.chain.tip.height < network.names.claimPeriod - 2)
+        await mineBlock(node);
+
+      await node.mempool.insertClaim(claim);
+      block = await mineBlock(node, { ignoreClaims: true });
+
+      // Should invalidate the claim, because next block can't have claims.
+      assert.strictEqual(node.mempool.claims.size, 0);
+      assert.strictEqual(block.txs[0].outputs.length, 1);
+
+      // Should fail to insert claim, as they can't be mined.
+      let err;
+      try {
+        err = await node.mempool.insertClaim(claim);
+      } catch (e) {
+        err = e;
+      }
+
+      assert(err);
+      assert.strictEqual(err.type, 'VerifyError');
+      assert.strictEqual(err.reason, 'invalid-covenant');
+
+      block = await mineBlock(node);
+      assert.strictEqual(node.mempool.claims.size, 0);
+      assert.strictEqual(block.txs[0].outputs.length, 1);
+    });
+  });
+});
+
+async function mineBlock(node, opts = {}) {
+  assert(node);
+  const chain = node.chain;
+  const miner = node.miner;
+
+  const ignoreClaims = opts.ignoreClaims || false;
+
+  const forBlock = forEvent(node, 'block', 1, 2000);
+
+  let backupClaims = null;
+
+  if (ignoreClaims) {
+    backupClaims = node.mempool.claims;
+    node.mempool.claims = new BufferMap();
+  }
+  const job = await miner.cpu.createJob(chain.tip);
+
+  job.refresh();
+
+  if (ignoreClaims)
+    node.mempool.claims = backupClaims;
+
+  const block = await job.mineAsync();
+  await chain.add(block);
+  await forBlock;
+
+  return block;
+}