fix wasm support for terra classic

src/scripts/export/handlers/wasm.ts

@@ -43,6 +43,11 @@ export const wasm: HandlerMaker<WasmExportData> = async ({
 }) => {
   const chainId = await cosmWasmClient.getChainId()
 
+  // Terra Classic uses different prefixes:
+  // https://github.com/classic-terra/wasmd/blob/v0.30.0-terra.3/x/wasm/types/keys.go#L31-L32
+  const CONTRACT_KEY_PREFIX = chainId === 'columbus-5' ? 0x04 : 0x02
+  const CONTRACT_STORE_PREFIX = chainId === 'columbus-5' ? 0x05 : 0x03
+
   // Get code ID for contract, cached in memory.
   const codeIdCache = new LRUCache<string, number>({
     max: 1000,
@@ -101,16 +106,17 @@ export const wasm: HandlerMaker<WasmExportData> = async ({
   }
 
   const match: Handler<WasmExportData>['match'] = (trace) => {
-    // ContractStorePrefix = 0x03
     // wasm keys are formatted as:
     // ContractStorePrefix || contractAddressBytes || keyBytes
 
-    // ContractKeyPrefix = 0x02
     // contract info keys are formatted as:
     // ContractKeyPrefix || contractAddressBytes
 
     const keyData = fromBase64(trace.key)
-    if (keyData[0] !== 0x02 && keyData[0] !== 0x03) {
+    if (
+      keyData[0] !== CONTRACT_STORE_PREFIX &&
+      keyData[0] !== CONTRACT_KEY_PREFIX
+    ) {
       return
     }
 
@@ -133,13 +139,13 @@ export const wasm: HandlerMaker<WasmExportData> = async ({
     const blockTimeUnixMs = BigInt(trace.blockTimeUnixMs).toString()
 
     // If contract key, save contract info.
-    if (trace.operation === 'write' && keyData[0] === 0x02) {
+    if (trace.operation === 'write' && keyData[0] === CONTRACT_KEY_PREFIX) {
       // Parse as protobuf to get code ID.
       const protobufContractInfo = fromBase64(trace.value)
       let contractInfo
       try {
         contractInfo = ContractInfo.decode(protobufContractInfo)
-      } catch {
+      } catch (err) {
         // If failed to decode, not contract info.
         return
       }