graph, runtime/wasm: Make EthereumEventData's log_type value optional

Author: fordN

graph/src/components/ethereum/types.rs

@@ -87,7 +87,7 @@ pub struct EthereumEventData {
     pub address: Address,
     pub log_index: U256,
     pub transaction_log_index: U256,
-    pub log_type: String,
+    pub log_type: Option<String>,
     pub block: EthereumBlockData,
     pub transaction: EthereumTransactionData,
     pub params: Vec<LogParam>,

runtime/wasm/src/module/mod.rs

@@ -219,7 +219,7 @@ where
             address: log.address,
             log_index: log.log_index.unwrap_or(U256::zero()),
             transaction_log_index: log.transaction_log_index.unwrap_or(U256::zero()),
-            log_type: log.log_type.clone().unwrap_or("None".to_string()),
+            log_type: log.log_type.clone(),
             params,
         };
 

runtime/wasm/src/to_from/external.rs

@@ -295,7 +295,11 @@ impl ToAscObj<AscEthereumEvent> for EthereumEventData {
             log_index: heap.asc_new(&BigInt::from_unsigned_u256(&self.log_index)),
             transaction_log_index: heap
                 .asc_new(&BigInt::from_unsigned_u256(&self.transaction_log_index)),
-            log_type: heap.asc_new(&self.log_type),
+            log_type: self
+                .log_type
+                .clone()
+                .map(|log_type| heap.asc_new(&log_type))
+                .unwrap_or_else(|| AscPtr::null()),
             block: heap.asc_new(&self.block),
             transaction: heap.asc_new(&self.transaction),
             params: heap.asc_new(self.params.as_slice()),