chore(starknet_gateway): use const for json rpc version

commit-id:69ba79bd

crates/starknet_gateway/src/config.rs

@@ -11,6 +11,8 @@ use validator::Validate;
 
 use crate::compiler_version::VersionId;
 
+const JSON_RPC_VERSION: &str = "2.0";
+
 #[derive(Clone, Debug, Default, Serialize, Deserialize, Validate, PartialEq)]
 pub struct GatewayConfig {
     pub stateless_tx_validator_config: StatelessTransactionValidatorConfig,
@@ -119,16 +121,28 @@ impl SerializeConfig for StatelessTransactionValidatorConfig {
     }
 }
 
-#[derive(Clone, Debug, Default, Serialize, Deserialize, Validate, PartialEq)]
+#[derive(Clone, Debug, Serialize, Deserialize, Validate, PartialEq)]
 pub struct RpcStateReaderConfig {
     pub url: String,
     pub json_rpc_version: String,
 }
 
+impl RpcStateReaderConfig {
+    pub fn from_url(url: String) -> Self {
+        Self { url, ..Default::default() }
+    }
+}
+
+impl Default for RpcStateReaderConfig {
+    fn default() -> Self {
+        Self { url: Default::default(), json_rpc_version: JSON_RPC_VERSION.to_string() }
+    }
+}
+
 #[cfg(any(feature = "testing", test))]
 impl RpcStateReaderConfig {
     pub fn create_for_testing() -> Self {
-        Self { url: "http://localhost:8080".to_string(), json_rpc_version: "2.0".to_string() }
+        Self::from_url("http://localhost:8080".to_string())
     }
 }