fix: filter out empty bytecode (#1248)

ethers-contract/ethers-contract-abigen/src/contract/methods.rs

@@ -44,7 +44,10 @@ impl Context {
 
     /// Returns all deploy (constructor) implementations
     pub(crate) fn deployment_methods(&self) -> TokenStream {
-        if self.contract_bytecode.is_some() {
+        if self.contract_bytecode.is_none() {
+            // don't generate deploy if no bytecode
+            return quote! {}
+        }
         let ethers_core = ethers_core_crate();
         let ethers_contract = ethers_contract_crate();
 
@@ -91,10 +94,7 @@ impl Context {
 
         };
 
-            return deploy
-        }
-
-        quote! {}
+        deploy
     }
 
     /// Expands to the corresponding struct type based on the inputs of the given function

ethers-contract/ethers-contract-abigen/src/rawabi.rs

@@ -168,10 +168,18 @@ impl<'de> Visitor<'de> for AbiObjectVisitor {
                     abi = Some(RawAbi(map.next_value::<Vec<Item>>()?));
                 }
                 "bytecode" | "byteCode" => {
-                    bytecode = map.next_value::<BytecodeObject>().ok().map(|obj| obj.object);
+                    bytecode = map
+                        .next_value::<BytecodeObject>()
+                        .ok()
+                        .map(|obj| obj.object)
+                        .filter(|bytecode| !bytecode.0.is_empty());
                 }
                 "bin" => {
-                    bytecode = map.next_value::<DeserializeBytes>().ok().map(|b| b.0);
+                    bytecode = map
+                        .next_value::<DeserializeBytes>()
+                        .ok()
+                        .map(|b| b.0)
+                        .filter(|b| !b.0.is_empty());
                 }
                 _ => {
                     map.next_value::<serde::de::IgnoredAny>()?;
@@ -185,7 +193,7 @@ impl<'de> Visitor<'de> for AbiObjectVisitor {
 }
 
 impl<'de> Deserialize<'de> for AbiObject {
-    fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
+    fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
     where
         D: Deserializer<'de>,
     {
@@ -269,4 +277,30 @@ mod tests {
         let artifact = include_str!("../../tests/solidity-contracts/greeter.json");
         assert_has_bytecode(artifact);
     }
+
+    #[test]
+    fn ignores_empty_bytecode() {
+        let abi_str = r#"[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint64","name":"number","type":"uint64"}],"name":"MyEvent","type":"event"},{"inputs":[],"name":"greet","outputs":[],"stateMutability":"nonpayable","type":"function"}]"#;
+        let s = format!(r#"{{"abi": {}, "bin" : "0x" }}"#, abi_str);
+
+        match serde_json::from_str::<JsonAbi>(&s).unwrap() {
+            JsonAbi::Object(abi) => {
+                assert!(abi.bytecode.is_none());
+            }
+            _ => {
+                panic!("expected abi object")
+            }
+        }
+
+        let s = format!(r#"{{"abi": {}, "bytecode" : {{ "object": "0x" }} }}"#, abi_str);
+
+        match serde_json::from_str::<JsonAbi>(&s).unwrap() {
+            JsonAbi::Object(abi) => {
+                assert!(abi.bytecode.is_none());
+            }
+            _ => {
+                panic!("expected abi object")
+            }
+        }
+    }
 }