papers/lux-gchain-graphql/sections/09-integration-patterns.tex

\section{Integration Patterns}


\subsection{DApp Integration}

\textbf{JavaScript SDK:}
\begin{lstlisting}[language=TypeScript, basicstyle=\small\ttfamily]
import { GChainClient } from '@lux/gchain-sdk';

const client = new GChainClient({
  endpoint: 'https://gchain.lux.network/graphql',
  apiKey: process.env.GCHAIN_API_KEY
});

// Cross-chain portfolio query
const portfolio = await client.query({
  query: gql`
    query Portfolio($address: Address!) {
      addressBalances(address: $address) {
        chain
        asset { symbol }
        balance
        valueUSD
      }
    }
  `,
  variables: { address: userAddress }
});
\end{lstlisting}

\subsection{Wallet Integration}

\textbf{Multi-Chain Balance Display:}
\begin{lstlisting}[language=TypeScript, basicstyle=\small\ttfamily]
// Query all user balances across chains
const balances = await gchain.query({
  query: gql`
    query WalletBalances($address: Address!) {
      addressBalances(address: $address, chains: ALL) {
        chain
        asset {
          symbol
          decimals
          priceUSD
        }
        balance
        valueUSD
      }
    }
  `,
  variables: { address: walletAddress }
});

// Display in wallet UI with real-time prices
balances.forEach(({ chain, asset, balance, valueUSD }) => {
  displayBalance(chain, asset.symbol, balance, valueUSD);
});
\end{lstlisting}

\subsection{DeFi Protocol Integration}

\textbf{Collateral Verification:}
\begin{lstlisting}[language=Solidity, basicstyle=\small\ttfamily]
contract LendingProtocol {
    IGChainQuery gchain;
    
    function checkCollateral(address borrower) internal view returns (bool) {
        bytes memory query = compileQuery(
            "query($user: Address!) { "
            "  addressBalances(address: $user, chains: [C, X]) { "
            "    asset { riskScore } "
            "    valueUSD "
            "  } "
            "}"
        );
        
        bytes memory result = gchain.executeQuery(
            query,
            abi.encode(borrower)
        );
        
        // Parse and verify collateral sufficiency
        return parseCollateral(result) >= requiredCollateral;
    }
}
\end{lstlisting}