feat: add batch fn for saveDlcAccepts rocksdb

Add saveDlcAccepts to rocksdb specifically for batch funded dlcs

justfile

@@ -1,6 +1,9 @@
 install:
   yarn && yarn bootstrap
 
+bootstrap:
+  yarn bootstrap
+
 build:
   yarn build
 

packages/rocksdb/__tests__/rocksdb-dlc-store.spec.ts

@@ -10,7 +10,7 @@ import {
   DlcTransactionsV0,
   FundingInputV0,
 } from '@node-dlc/messaging';
-import { OutPoint } from '@node-lightning/bitcoin';
+import { OutPoint, Value } from '@node-lightning/bitcoin';
 import { sha256, xor } from '@node-lightning/crypto';
 import { expect } from 'chai';
 
@@ -211,6 +211,23 @@ describe('RocksdbDlcStore', () => {
 
   const dlcClose = DlcCloseV0.deserialize(dlcCloseHex);
 
+  // Batch Dlc Messages
+
+  // Increase funding input amount to match minimum collateral for batch
+  const dlcOfferForBatch = DlcOfferV0.deserialize(dlcOffer.serialize());
+  (dlcOfferForBatch
+    .fundingInputs[0] as FundingInputV0).prevTx.outputs[0].value = Value.fromBitcoin(
+    4,
+  );
+
+  // Increase funding input amount to match minimum collateral for batch
+  const dlcAcceptForBatch = DlcAcceptV0.deserialize(dlcAccept.serialize());
+  dlcAcceptForBatch.tempContractId = sha256(dlcOfferForBatch.serialize());
+  (dlcAcceptForBatch
+    .fundingInputs[0] as FundingInputV0).prevTx.outputs[0].value = Value.fromBitcoin(
+    4,
+  );
+
   before(async () => {
     util.rmdir('.testdb');
     sut = new RocksdbDlcStore('./.testdb/nested/dir');
@@ -365,6 +382,13 @@ describe('RocksdbDlcStore', () => {
     });
   });
 
+  describe('save dlc_accepts', () => {
+    it('should save batch dlc accepts', async () => {
+      await sut.saveDlcOffer(dlcOfferForBatch);
+      await sut.saveDlcAccepts([dlcAcceptForBatch, dlcAcceptForBatch]);
+    });
+  });
+
   describe('delete dlc_offer', () => {
     it('should delete dlc_offer', async () => {
       await sut.deleteDlcOffer(contractId);

packages/rocksdb/lib/rocksdb-dlc-store.ts

@@ -1,6 +1,5 @@
-import { DlcTxBuilder } from '@node-dlc/core';
+import { BatchDlcTxBuilder, DlcTxBuilder } from '@node-dlc/core';
 import {
-  ContractInfo,
   ContractInfoV0,
   ContractInfoV1,
   DlcAcceptV0,
@@ -257,6 +256,50 @@ export class RocksdbDlcStore extends RocksdbBase {
     await this._db.put(key3, contractId);
   }
 
+  // NOTE: ONLY USE FOR BATCH FUNDED DLCs
+  public async saveDlcAccepts(dlcAccepts: DlcAcceptV0[]): Promise<void> {
+    const dlcOffers: DlcOfferV0[] = [];
+    for (let i = 0; i < dlcAccepts.length; i++) {
+      const dlcOffer = await this.findDlcOffer(dlcAccepts[i].tempContractId);
+      dlcOffers.push(dlcOffer);
+    }
+    const txBuilder = new BatchDlcTxBuilder(dlcOffers, dlcAccepts);
+    const tx = txBuilder.buildFundingTransaction();
+    const fundingTxId = tx.txId.serialize();
+    const contractIds = dlcAccepts.map((dlcAccepts) =>
+      xor(fundingTxId, dlcAccepts.tempContractId),
+    );
+    for (let i = 0; i < dlcAccepts.length; i++) {
+      const value = dlcAccepts[i].serialize();
+      const key = Buffer.concat([
+        Buffer.from([Prefix.DlcAcceptV0]),
+        contractIds[i],
+      ]);
+      await this._db.put(key, value);
+
+      // store funding input outpoint reference
+      for (let i = 0; i < dlcAccepts[i].fundingInputs.length; i++) {
+        const fundingInput = dlcAccepts[i].fundingInputs[i] as FundingInputV0;
+
+        const outpoint = OutPoint.fromString(
+          `${fundingInput.prevTx.txId.toString()}:${fundingInput.prevTxVout}`,
+        );
+
+        const key2 = Buffer.concat([
+          Buffer.from([Prefix.Outpoint]),
+          Buffer.from(outpoint.toString()),
+        ]);
+        await this._db.put(key2, contractIds[i]);
+      }
+
+      const key3 = Buffer.concat([
+        Buffer.from([Prefix.TempContractId]),
+        dlcAccepts[i].tempContractId,
+      ]);
+      await this._db.put(key3, contractIds[i]);
+    }
+  }
+
   public async deleteDlcAccept(contractId: Buffer): Promise<void> {
     const key = Buffer.concat([Buffer.from([Prefix.DlcAcceptV0]), contractId]);
     await this._db.del(key);