Add 0xRoulette adapter for Solana (#16993)

Author: lucien-delaforge

projects/0xRoulette/index.js

@@ -0,0 +1,45 @@
+const { Connection, PublicKey } = require('@solana/web3.js');
+
+const PROGRAM_ID = "Rou1svrgkcuo1rBNkP1XaESrD9xRpukx2uLY5MsgK14";
+const VAULT_ACCOUNT_SIZE = 120;
+const VAULT_DISCRIMINATOR = Buffer.from('e6fbf1538bca5d1c', 'hex');
+
+function decodeVaultAccount(data) {
+  const tokenMintBuffer = data.slice(0, 32);
+  const totalLiquidity = data.readBigUInt64LE(64);
+  
+  const tokenMint = new PublicKey(tokenMintBuffer).toString();
+  
+  return {
+    tokenMint,
+    totalLiquidity: totalLiquidity.toString(),
+  };
+}
+
+async function tvl(_, _2, _3, { api }) {
+  const connection = new Connection("https://api.mainnet-beta.solana.com");
+  const programId = new PublicKey(PROGRAM_ID);
+
+  const accounts = await connection.getProgramAccounts(programId, {
+    filters: [{ dataSize: VAULT_ACCOUNT_SIZE }],
+  });
+
+  for (const { account } of accounts) {
+    if (account.data.slice(0, 8).equals(VAULT_DISCRIMINATOR)) {
+      const decoded = decodeVaultAccount(account.data.slice(8));
+      api.add(decoded.tokenMint, decoded.totalLiquidity);
+    }
+  }
+}
+
+module.exports = {
+  timetravel: false,
+  misrepresentedTokens: false,
+  methodology:
+    "TVL is calculated by fetching all program accounts using @solana/web3.js. " +
+    "Filters for vaults by account size (120 bytes) and discriminator. " +
+    "Raw token balances are passed to the SDK for USD conversion.",
+  solana: {
+    tvl,
+  },
+};