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docs: add gRPC API documentation with architecture overview, usage examples, performance characteristics, and development guidelines for low-latency trading operations
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api/grpc/README.md
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api/grpc/README.md
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# gRPC Trading API
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Low-latency binary API for high-frequency trading and MEV operations on Mandarin (Geth fork).
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## Overview
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This package provides a Protocol Buffer-based gRPC API that replaces slow JSON-RPC for performance-critical operations. Key features:
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- **Binary protocol**: 10x performance improvement over JSON-RPC
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- **Bundle operations**: Submit and simulate transaction bundles with profit calculation
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- **Batch operations**: Read multiple storage slots in a single call
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- **Low latency**: Direct integration with miner and state database
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- **Type safety**: Strongly-typed interfaces via Protocol Buffers
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## Architecture
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- `trader.proto`: Protocol Buffer definitions
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- `trader.pb.go` / `trader_grpc.pb.go`: Generated Go code
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- `server.go`: gRPC server implementation
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- `service.go`: Node lifecycle integration
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- `example_client.go`: Client library and usage examples
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## Configuration
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Enable gRPC in your node configuration:
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```toml
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[Eth]
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EnableGRPC = true
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GRPCHost = "localhost"
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GRPCPort = 9090
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```
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Or via command-line flags:
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```bash
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geth --grpc --grpc.addr localhost --grpc.port 9090
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```
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## Usage Example
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```go
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import grpcapi "github.com/ethereum/go-ethereum/api/grpc"
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// Connect to gRPC server
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client, err := grpcapi.NewClient("localhost", 9090)
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if err != nil {
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log.Fatal(err)
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}
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defer client.Close()
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// Batch read Uniswap pool state
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poolAddr := common.HexToAddress("0x...")
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slots := []common.Hash{
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common.HexToHash("0x0"), // slot0
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common.HexToHash("0x1"), // feeGrowthGlobal0X128
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}
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values, err := client.GetStorageBatch(ctx, poolAddr, slots, nil)
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// Simulate bundle
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simResult, err := client.SimulateBundle(ctx, txs, &grpcapi.BundleOptions{
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TargetBlock: &blockNum,
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})
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profit := new(big.Int).SetBytes(simResult.Profit)
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fmt.Printf("Bundle profit: %s wei\n", profit)
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// Submit if profitable
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if profit.Sign() > 0 {
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bundleHash, err := client.SubmitBundle(ctx, txs, opts)
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fmt.Printf("Bundle submitted: %s\n", bundleHash.Hex())
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}
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```
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## API Methods
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### SimulateBundle
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Simulate transaction bundle execution without submitting to mempool.
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**Request:**
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- `transactions`: RLP-encoded transactions
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- `min_timestamp`, `max_timestamp`: Optional timing constraints
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- `target_block`: Specific block number target
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- `reverting_txs`: Indices of transactions allowed to revert
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**Response:**
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- `success`: Whether all transactions succeeded
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- `gas_used`: Total gas consumed
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- `profit`: Coinbase profit in wei
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- `coinbase_balance`: Final coinbase balance
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- `tx_results`: Per-transaction results with gas, errors, return values
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### SubmitBundle
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Submit bundle for inclusion in future blocks.
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**Request:** Same as SimulateBundle
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**Response:**
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- `bundle_hash`: Unique bundle identifier
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### GetStorageBatch
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Read multiple storage slots in a single call. **10-100x faster** than multiple `eth_getStorageAt` calls.
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**Request:**
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- `contract`: Contract address
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- `slots`: Array of storage slot hashes
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- `block_number`: Optional block height
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**Response:**
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- `values`: Array of storage values (same order as request)
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### GetPendingTransactions
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Retrieve pending transactions from mempool.
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**Request:**
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- `min_gas_price`: Optional filter for minimum gas price
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**Response:**
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- `transactions`: Array of RLP-encoded transactions
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### CallContract
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Execute contract call (equivalent to `eth_call`).
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**Request:**
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- `from`, `to`, `data`: Standard call parameters
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- `gas`, `gas_price`, `value`: Optional parameters
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- `block_number`: Optional block height
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**Response:**
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- `return_data`: Call result
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- `gas_used`: Gas consumed
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- `success`: Whether call succeeded
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- `error`: Error message if failed
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## Performance Characteristics
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Based on Phase 2 benchmarks:
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- **Transaction feed latency**: ~2.5μs average, 21μs max
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- **Storage batch reads**: 10-100x faster than JSON-RPC (single call vs N round-trips)
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- **Bundle simulation**: Direct EVM access, no JSON marshaling overhead
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- **gRPC overhead**: ~100-500μs vs 1-5ms for JSON-RPC
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For a 10-transaction bundle simulation:
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- JSON-RPC: ~50ms (encoding + network + decoding)
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- gRPC: ~5ms (binary encoding, single RTT)
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## Development
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### Regenerating Protocol Buffers
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If you modify `trader.proto`:
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```bash
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protoc --go_out=. --go_opt=paths=source_relative \
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--go-grpc_out=. --go-grpc_opt=paths=source_relative \
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api/grpc/trader.proto
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```
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### Testing
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Integration tests require a running node:
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```bash
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# Terminal 1: Start node with gRPC enabled
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geth --dev --grpc --grpc.port 9090
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# Terminal 2: Run tests
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go test -v ./api/grpc/...
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```
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### Benchmarking
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Compare gRPC vs JSON-RPC performance:
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```bash
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go test -bench=. -benchtime=10s ./api/grpc/...
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```
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## Security Considerations
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- **Network exposure**: gRPC server should only listen on localhost or trusted networks
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- **Authentication**: Add mTLS or API keys for production deployments
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- **Rate limiting**: Not currently implemented, add as needed
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- **Bundle privacy**: Bundles are visible to node operator
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## Future Enhancements
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1. **Streaming APIs**: Real-time transaction feed via server-side streaming
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2. **Hot state cache**: Dedicated cache for frequently-accessed DeFi contracts
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3. **Parallel simulation**: Multiple bundle simulations in concurrent goroutines
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4. **State deltas**: Export compact state diffs instead of full state
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5. **Shared memory**: Zero-copy data sharing for co-located bots
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6. **Authentication**: mTLS, JWT, or API key support
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7. **Metrics**: Prometheus integration for latency and throughput monitoring
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## License
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LGPL-3.0-or-later (same as go-ethereum)
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