feat: init obligation. resolves #39

src/actions/borrow.tsx

@@ -26,6 +26,7 @@ import {
   BorrowAmountType,
   LendingObligation,
   approve,
+  initObligationInstruction,
 } from "../models";
 import { toLamports } from "../utils/utils";
 
@@ -185,7 +186,22 @@ export const borrow = async (
     )
     : undefined;
 
-  // deposit
+  if (!obligationAccount) {
+    instructions.push(
+      initObligationInstruction(
+        depositReserve.pubkey,
+        borrowReserve.pubkey,
+        obligation,
+        obligationMint,
+        obligationTokenOutput,
+        wallet.publicKey,
+        depositReserve.info.lendingMarket,
+        authority,
+      )
+    );
+  }
+
+  // borrow
   instructions.push(
     borrowInstruction(
       amountLamports,
@@ -202,7 +218,6 @@ export const borrow = async (
       obligation,
       obligationMint,
       obligationTokenOutput,
-      wallet.publicKey,
 
       depositReserve.info.lendingMarket,
       authority,

src/models/lending/borrow.ts

@@ -1,4 +1,4 @@
-import { PublicKey, SYSVAR_CLOCK_PUBKEY, SYSVAR_RENT_PUBKEY, TransactionInstruction } from '@solana/web3.js';
+import { PublicKey, SYSVAR_CLOCK_PUBKEY, TransactionInstruction } from '@solana/web3.js';
 import BN from 'bn.js';
 import * as BufferLayout from 'buffer-layout';
 import { TOKEN_PROGRAM_ID, LENDING_PROGRAM_ID } from '../../utils/ids';
@@ -24,16 +24,14 @@ export enum BorrowAmountType {
 ///   6. `[writable]` Obligation
 ///   7. `[writable]` Obligation token mint
 ///   8. `[writable]` Obligation token output
-///   9. `[]` Obligation token owner
+///   8 `[]` Lending market account.
-///   10 `[]` Lending market account.
+///   10 `[]` Derived lending market authority.
-///   11 `[]` Derived lending market authority.
+///   11 `[]` User transfer authority ($authority).
-///   12 `[]` User transfer authority ($authority).
+///   12 `[]` Dex market
-///   13 `[]` Dex market
+///   13 `[]` Dex market order book side
-///   14 `[]` Dex market order book side
+///   14 `[]` Temporary memory
-///   15 `[]` Temporary memory
+///   15 `[]` Clock sysvar
-///   16 `[]` Clock sysvar
+///   16 '[]` Token program id
-///   17 `[]` Rent sysvar
-///   18 '[]` Token program id
 export const borrowInstruction = (
   amount: number | BN,
   amountType: BorrowAmountType,
@@ -49,7 +47,6 @@ export const borrowInstruction = (
   obligation: PublicKey,
   obligationMint: PublicKey,
   obligationTokenOutput: PublicKey,
-  obligationTokenOwner: PublicKey,
 
   lendingMarket: PublicKey,
   lendingMarketAuthority: PublicKey,
@@ -98,7 +95,6 @@ export const borrowInstruction = (
     { pubkey: obligation, isSigner: false, isWritable: true },
     { pubkey: obligationMint, isSigner: false, isWritable: true },
     { pubkey: obligationTokenOutput, isSigner: false, isWritable: true },
-    { pubkey: obligationTokenOwner, isSigner: false, isWritable: false },
 
     { pubkey: lendingMarket, isSigner: false, isWritable: false },
     { pubkey: lendingMarketAuthority, isSigner: false, isWritable: false },
@@ -108,7 +104,6 @@ export const borrowInstruction = (
     { pubkey: dexOrderBookSide, isSigner: false, isWritable: false },
     { pubkey: memory, isSigner: false, isWritable: false },
     { pubkey: SYSVAR_CLOCK_PUBKEY, isSigner: false, isWritable: false },
-    { pubkey: SYSVAR_RENT_PUBKEY, isSigner: false, isWritable: false },
     { pubkey: TOKEN_PROGRAM_ID, isSigner: false, isWritable: false },
   ];
 

src/models/lending/obligation.ts

@@ -1,6 +1,8 @@
-import { AccountInfo, PublicKey } from "@solana/web3.js";
+import { AccountInfo, PublicKey, SYSVAR_CLOCK_PUBKEY, SYSVAR_RENT_PUBKEY, TransactionInstruction } from "@solana/web3.js";
 import BN from "bn.js";
 import * as BufferLayout from "buffer-layout";
+import { LendingInstruction } from ".";
+import { LENDING_PROGRAM_ID, TOKEN_PROGRAM_ID } from "../../utils/ids";
 import * as Layout from "./../../utils/layout";
 
 export const LendingObligationLayout: typeof BufferLayout.Structure = BufferLayout.struct(
@@ -60,3 +62,50 @@ export const LendingObligationParser = (
 export const healthFactorToRiskColor = (health: number) => {
   return '';
 } 
+
+export const initObligationInstruction = (
+  depositReserve: PublicKey,
+  borrowReserve: PublicKey,
+  obligation: PublicKey,
+  obligationMint: PublicKey,
+  obligationTokenOutput: PublicKey,
+  obligationTokenOwner: PublicKey,
+  lendingMarket: PublicKey,
+  lendingMarketAuthority: PublicKey,
+  
+
+  
+): TransactionInstruction => {
+  const dataLayout = BufferLayout.struct([
+    BufferLayout.u8('instruction'),
+  ]);
+
+  const data = Buffer.alloc(dataLayout.span);
+  dataLayout.encode(
+    {
+      instruction: LendingInstruction.InitObligation, 
+    },
+    data
+  );
+
+  const keys = [
+    { pubkey: depositReserve, isSigner: false, isWritable: true },
+    { pubkey: borrowReserve, isSigner: false, isWritable: true },
+    { pubkey: obligation, isSigner: false, isWritable: true },
+    { pubkey: obligationMint, isSigner: false, isWritable: true },
+    { pubkey: obligationTokenOutput, isSigner: false, isWritable: true },
+    { pubkey: obligationTokenOwner, isSigner: false, isWritable: false },
+
+    { pubkey: lendingMarket, isSigner: false, isWritable: false },
+    { pubkey: lendingMarketAuthority, isSigner: false, isWritable: false },
+
+    { pubkey: SYSVAR_CLOCK_PUBKEY, isSigner: false, isWritable: false },
+    { pubkey: SYSVAR_RENT_PUBKEY, isSigner: false, isWritable: false },
+    { pubkey: TOKEN_PROGRAM_ID, isSigner: false, isWritable: false },
+  ];
+  return new TransactionInstruction({
+    keys,
+    programId: LENDING_PROGRAM_ID,
+    data,
+  });
+};