,
generate_entrypoints: bool,
) -> Result<(), HookOrchestratorError> {
// TODO: Implement custom orchestration logic
// 1. Extract metadata for components
// 2. Generate entrypoints (if generate_entrypoints == true)
// 3. Inject balances into components
// 4. Inject limits for RPC optimization
// 5. Update block_changes with new data
Ok(())
}
}
```
For most use cases, **proceed with the default orchestrator** and skip this step.
**Step 4: Register Components**
Set up all registries to wire your implementation into the Hooks DCI.
**Registration Code**:
In your integration folder add a register function with your protocol specifics
```rust
pub(super) fn register_my_hook_integrations(
generator_registry: &mut MetadataGeneratorRegistry,
parser_registry: &mut MetadataResponseParserRegistry,
_provider_registry: &mut ProviderRegistry,
rpc_url: String,
) {
generator_registry.register_hook_identifier(
"my_hook".to_string(),
Box::new(MyHookMetadataGenerator::new(rpc_url)),
);
parser_registry.register_parser("my_hook".to_string(), Box::new(MyHookMetadataResponseParser));
}
```
Then add it in the global registration function with other hooks
// From: tycho-indexer/src/extractor/dynamic_contract_indexer/hooks/integrations/mod.rs
pub(super) fn register_integrations(
generator_registry: &mut MetadataGeneratorRegistry,
parser_registry: &mut MetadataResponseParserRegistry,
provider_registry: &mut ProviderRegistry,
rpc_url: String,
) {
euler::register_euler_integrations(
generator_registry,
parser_registry,
provider_registry,
rpc_url,
);
// Add your hook registration here
}
**Key Configuration Points**:
1. **Generator Registration**: Use `register_hook_identifier()` if your components have a "hook\_identifier" static attribute, or `register_hook_generator()` for specific addresses
2. **Parser Name**: Must match the `generator_name` in your MetadataRequests
3. **Routing Key**: Must match the `routing_key` in your MetadataRequests
4. **Estimation Method**: Choose `with_limits()` if you provide limits, `with_balances()` otherwise
5. **Sample Size**: Number of entrypoints to generate per token pair (typically 4)
**Step 5: Initialize Hooks DCI**
Create and initialize the UniswapV4HookDCI instance.
**Initialization Code**:
```rust
use tycho_common::models::{Chain, Address};
use crate::extractor::dynamic_contract_indexer::{
dci::DynamicContractIndexer,
hook_dci::UniswapV4HookDCI,
};
pub async fn create_hooks_dci_indexer(
chain: Chain,
extractor_name: String,
rpc_url: String,
router_address: Address,
pool_manager: Address,
db_gateway: impl EntryPointGateway + ProtocolGateway + Send + Sync + 'static,
account_extractor: impl AccountExtractor + Send + Sync + 'static,
entrypoint_tracer: impl EntryPointTracer + Send + Sync + 'static,
) -> Result, ExtractionError> {
// 1. Create inner DCI (standard indexer)
let inner_dci = DynamicContractIndexer::new(
chain.clone(),
extractor_name.clone(),
db_gateway.clone(),
account_extractor,
entrypoint_tracer,
);
// 2. Setup metadata and hook orchestrators (from Step 4)
let (metadata_orchestrator, hook_orchestrator_registry) =
setup_my_hook_indexing(rpc_url, router_address, pool_manager, chain.clone());
// 3. Create Hooks DCI
let mut hook_dci = UniswapV4HookDCI::new(
inner_dci,
metadata_orchestrator,
hook_orchestrator_registry,
db_gateway,
chain,
max_retries: 3, // Retry up to 3 times before giving up
pause_after_retries: 2 // Pause after 2 retries (before hitting max)
);
// 4. Initialize (loads existing components from database)
hook_dci.initialize().await?;
Ok(hook_dci)
}
```
**Configuration Parameters**:
* `max_retries`: Maximum total retry attempts before permanently failing a component
* `pause_after_retries`: Number of retries before pausing (setting "paused" attribute)
**Typical Values**:
* `max_retries: 5`, `pause_after_retries: 3`
**Step 6: Testing Your Integration**
Test your implementation at multiple levels.
**Unit Tests**:
```rust
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_generator_creates_balance_request() {
let generator = MyHookGenerator::new("http://localhost:8545".to_string());
let component = create_test_component();
let block = create_test_block();
let requests = generator.generate_balance_only_requests(&component, &block)
.expect("Should generate requests");
assert_eq!(requests.len(), 1);
assert!(matches!(
requests[0].request_type,
MetadataRequestType::ComponentBalance { .. }
));
}
#[test]
fn test_parser_handles_balance_response() {
let parser = MyHookParser;
let component = create_test_component();
let request = create_test_balance_request();
let response = json!("0x000000000000000000000000000000000000000000000000000000000000271000000000000000000000000000000000000000000000000000000000000027100");
let result = parser.parse_response(&component, &request, &response)
.expect("Should parse response");
match result {
MetadataValue::Balances(balances) => {
assert_eq!(balances.len(), 2);
}
_ => panic!("Expected Balances variant"),
}
}
}
```
**Integration Tests with Real RPC**:
```rust
#[tokio::test]
#[ignore] // Requires RPC access
async fn test_metadata_collection_integration() {
let rpc_url = std::env::var("RPC_URL")
.expect("RPC_URL environment variable must be set");
// Setup registries
let (metadata_orchestrator, _) = setup_my_hook_indexing(
rpc_url,
router_address,
pool_manager,
Chain::Ethereum,
);
// Create test component
let component = create_real_hook_component();
let block = Block::new(/* real block data */);
// Collect metadata
let metadata = metadata_orchestrator
.collect_metadata_for_block(
&[], // No balance-only components
&[(TxHash::default(), component.clone())], // Full processing
&block,
)
.await
.expect("Should collect metadata");
// Verify metadata
assert_eq!(metadata.len(), 1);
let (comp, meta) = &metadata[0];
assert!(meta.balances.is_some());
assert!(meta.limits.is_some());
}
```
### Final Step: Submitting a PR
After your integration is tested, please submit a PR on Github so we can add it to our codebase and start indexing the hook on our hosted service.
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