feat(template): Add template for singleton protocols.

Separate templates and add one for protocols with only a single contract.

substreams/ethereum-template-singleton/src/pool_factories.rs

@@ -0,0 +1,61 @@
+use serde::Deserialize;
+use substreams_ethereum::pb::eth::v2::{Call, Log, TransactionTrace};
+use tycho_substreams::models::{ChangeType, FinancialType, ImplementationType, ProtocolComponent, ProtocolType};
+
+
+#[derive(Deserialize)]
+pub struct DeploymentConfig {
+    #[serde(with = "hex::serde")]
+    pub vault_address: Vec<u8>,
+}
+
+/// Potentially constructs a new ProtocolComponent given a call
+///
+/// This method is given each individual call within a transaction, the corresponding
+/// logs emitted during that call as well as the full transaction trace.
+///
+/// If this call creates a component in your protocol please contstruct and return it
+/// here. Otherwise, simply return None.
+pub fn maybe_create_component(
+    call: &Call,
+    _log: &Log,
+    _tx: &TransactionTrace,
+    config: &DeploymentConfig,
+) -> Option<ProtocolComponent> {
+    if call.address == config.vault_address {
+        // TODO: replace with your logic
+        Some(ProtocolComponent {
+            id: "".to_string(),
+            tokens: vec![
+                // TODO: add the components tokens
+            ],
+            contracts: vec![
+                // TODO: any contracts required during swapping
+            ],
+            static_att: vec![
+                // TODO: any additional metadata required, e.g. for swap encoding
+            ],
+            change: ChangeType::Creation.into(),
+            protocol_type: Some(ProtocolType {
+                name: "template".to_string(),
+                financial_type: FinancialType::Swap.into(),
+                attribute_schema: vec![],
+                implementation_type: ImplementationType::Vm.into(),
+            }),
+        })
+    } else {
+        None
+    }
+}
+
+
+#[cfg(test)]
+mod test {
+    use super::*;
+    #[test]
+    fn test_decode_config() {
+        let config: DeploymentConfig = serde_qs::from_str("vault_address=0001").unwrap();
+
+        assert_eq!(config.vault_address, [0u8, 1u8]);
+    }
+}