test: add in memory dns cache.

test/auction-reorg-test.js

@@ -12,6 +12,7 @@ const MemWallet = require('./util/memwallet');
 const Network = require('../lib/protocol/network');
 const rules = require('../lib/covenants/rules');
 const {ownership} = require('../lib/covenants/ownership');
+const {CachedStubResolver} = require('./util/stub');
 
 const network = Network.get('regtest');
 const {treeInterval} = network.names;
@@ -73,6 +74,16 @@ function createNode() {
 describe('Auction Reorg', function() {
   this.timeout(20000);
 
+  const originalResolver = ownership.Resolver;
+
+  before(() => {
+    ownership.Resolver = CachedStubResolver;
+  });
+
+  after(() => {
+    ownership.Resolver = originalResolver;
+  });
+
   describe('Vickrey Auction Reorg', function() {
     const node = createNode();
     const orig = createNode();

test/auction-test.js

@@ -9,6 +9,7 @@ const MemWallet = require('./util/memwallet');
 const Network = require('../lib/protocol/network');
 const rules = require('../lib/covenants/rules');
 const {ownership} = require('../lib/covenants/ownership');
+const {CachedStubResolver} = require('./util/stub');
 
 const network = Network.get('regtest');
 const GNAME_SIZE = 10;
@@ -69,6 +70,16 @@ function createNode() {
 describe('Auction', function() {
   this.timeout(15000);
 
+  const originalResolver = ownership.Resolver;
+
+  before(() => {
+    ownership.Resolver = CachedStubResolver;
+  });
+
+  after(() => {
+    ownership.Resolver = originalResolver;
+  });
+
   describe('Vickrey Auction', function() {
     const node = createNode();
     const orig = createNode();

test/chain-checkpoints-test.js

@@ -13,6 +13,7 @@ const Network = require('../lib/protocol/network');
 const rules = require('../lib/covenants/rules');
 const {Resource} = require('../lib/dns/resource');
 const AirdropProof = require('../lib/primitives/airdropproof');
+const {CachedStubResolver} = require('./util/stub');
 
 const network = Network.get('regtest');
 
@@ -91,8 +92,11 @@ async function mineBlocks(n, label) {
 }
 
 describe('Checkpoints', function() {
+  const originalResolver = ownership.Resolver;
+
   before(async () => {
     ownership.ignore = true;
+    ownership.Resolver = CachedStubResolver;
 
     await blocks.open();
     await chainGenerator.open();
@@ -105,6 +109,7 @@ describe('Checkpoints', function() {
     await blocks.close();
 
     ownership.ignore = false;
+    ownership.Resolver = originalResolver;
   });
 
   it('should add addrs to miner', async () => {

test/chain-icann-lockup-test.js

@@ -10,6 +10,7 @@ const chainCommon = require('../lib/blockchain/common');
 const {BufferMap} = require('buffer-map');
 const {thresholdStates} = chainCommon;
 const {isReserved, isLockedUp, hashName} = require('../lib/covenants/rules');
+const {CachedStubResolver} = require('./util/stub');
 
 const SOFT_FORK_NAME = 'icannlockup';
 
@@ -52,6 +53,16 @@ const ACTUAL_RENEWAL_WINDOW = network.names.renewalWindow;
 describe('BIP9 - ICANN lockup (integration)', function() {
   this.timeout(20000);
 
+  const originalResolver = ownership.Resolver;
+
+  before(() => {
+    ownership.Resolver = CachedStubResolver;
+  });
+
+  after(() => {
+    ownership.Resolver = originalResolver;
+  });
+
   const CUSTOM = [
     'cloudflare',
     'nlnetlabs',

test/claim-test.js

@@ -9,6 +9,7 @@ const consensus = require('../lib/protocol/consensus');
 const {ownership} = require('../lib/covenants/ownership');
 const reserved = require('../lib/covenants/reserved');
 const {Resource} = require('../lib/dns/resource');
+const {CachedStubResolver} = require('./util/stub');
 
 const network = Network.get('regtest');
 
@@ -47,15 +48,19 @@ async function mineBlocks(n, addr) {
 describe('Reserved Name Claims', function() {
   this.timeout(10000);
 
+  const originalResolver = ownership.Resolver;
+
   before(async () => {
     await node.open();
 
     wallet = await wdb.create();
     addr = await wallet.receiveAddress();
+    ownership.Resolver = CachedStubResolver;
   });
 
   after(async () => {
     await node.close();
+    ownership.Resolver = originalResolver;
   });
 
   // Reset the ownership flag after every test,

test/mempool-invalidation-test.js

@@ -9,6 +9,7 @@ const rules = require('../lib/covenants/rules');
 const {states} = require('../lib/covenants/namestate');
 const {Resource} = require('../lib/dns/resource');
 const {forEvent} = require('./util/common');
+const {CachedStubResolver} = require('./util/stub');
 
 const network = Network.get('regtest');
 const {
@@ -21,6 +22,16 @@ const ACTUAL_CLAIM_PERIOD = claimPeriod;
 const ACTUAL_RENEWAL_WINDOW = renewalWindow;
 
 describe('Mempool Invalidation', function() {
+  const originalResolver = ownership.Resolver;
+
+  before(() => {
+    ownership.Resolver = CachedStubResolver;
+  });
+
+  after(() => {
+    ownership.Resolver = originalResolver;
+  });
+
   const NAMES = [
     // roots
     'nl',

test/mempool-test.js

@@ -33,6 +33,7 @@ const rules = require('../lib/covenants/rules');
 const NameState = require('../lib/covenants/namestate');
 const {states} = NameState;
 const {ownership} = require('../lib/covenants/ownership');
+const {CachedStubResolver} = require('./util/stub');
 
 const ONE_HASH = Buffer.alloc(32, 0x00);
 ONE_HASH[0] = 0x01;
@@ -75,6 +76,16 @@ async function getMockBlock(chain, txs = [], cb = true) {
 describe('Mempool', function() {
   this.timeout(5000);
 
+  const originalResolver = ownership.Resolver;
+
+  before(() => {
+    ownership.Resolver = CachedStubResolver;
+  });
+
+  after(() => {
+    ownership.Resolver = originalResolver;
+  });
+
   describe('Mempool TXs', function() {
     let workers, blocks, chain, mempool, wallet;
     let cachedTX;

test/txstart-test.js

@@ -14,6 +14,7 @@ const Address = require('../lib/primitives/address');
 const Script = require('../lib/script/script');
 const common = require('../lib/blockchain/common');
 const {ownership} = require('../lib/covenants/ownership');
+const {CachedStubResolver} = require('./util/stub');
 const VERIFY_NONE = common.flags.VERIFY_NONE;
 
 const node = new FullNode({
@@ -49,6 +50,8 @@ describe('Disable TXs', function() {
 
   let utxo, lastTX;
 
+  const originalResolver = ownership.Resolver;
+
   before(async () => {
     node.network.txStart = 5;
     await node.open();
@@ -56,11 +59,13 @@ describe('Disable TXs', function() {
     // Start with one block for the fakeClaim
     const block = await node.miner.mineBlock();
     assert(await node.chain.add(block));
+    ownership.Resolver = CachedStubResolver;
   });
 
   after(async () => {
     await node.close();
     node.network.txStart = RESET_TXSTART;
+    ownership.Resolver = originalResolver;
   });
 
   it('should reject tx from mempool before txStart', async () => {

test/util/stub.js

@@ -0,0 +1,85 @@
+'use strict';
+
+const assert = require('bsert');
+const path = require('path');
+const {StubResolver, wire} = require('bns');
+const fs = require('bfile');
+const {tmpdir} = require('os');
+
+let CACHE = {};
+
+/**
+ * Proxy requests if they are not cached.
+ */
+
+class CachedStubResolver extends StubResolver {
+  constructor(options) {
+    super(options);
+
+    this.enabled = true;
+    this.cacheOnDisk = false;
+    this.cacheFile = path.join(tmpdir(), 'hsd', 'dns-cache.json');
+
+    this.loadCacheSync();
+  }
+
+  loadCacheSync() {
+    if (!this.cacheOnDisk)
+      return;
+
+    if (fs.existsSync(this.cacheFile))
+      CACHE = JSON.parse(fs.readFileSync(this.cacheFile, 'utf8'));
+  }
+
+  saveCacheSync() {
+    if (!this.cacheOnDisk)
+      return;
+
+    const stringified = JSON.stringify(CACHE, null, 2);
+    fs.writeFileSync(this.cacheFile, stringified, 'utf8');
+  }
+
+  setCache(qs, res) {
+    if (!this.enabled)
+      return;
+
+    assert(qs instanceof wire.Question);
+    assert(res instanceof wire.Message);
+
+    CACHE[qs.toString()] = res.toString();
+    this.saveCacheSync();
+  }
+
+  hasCache(qs) {
+    if (!this.enabled)
+      return false;
+
+    assert(qs instanceof wire.Question);
+
+    return Boolean(CACHE[qs.toString()]);
+  }
+
+  getCache(qs) {
+    if (!this.enabled)
+      return null;
+
+    assert(qs instanceof wire.Question);
+
+    return wire.Message.fromString(CACHE[qs.toString()]);
+  }
+
+  async resolve(qs) {
+    if (this.hasCache(qs))
+      return this.getCache(qs);
+
+    const resolved = await super.resolve(qs);
+
+    if (!resolved)
+      return null;
+
+    this.setCache(qs, resolved);
+    return resolved;
+  }
+}
+
+exports.CachedStubResolver = CachedStubResolver;