fix(config): detect duplicate config insert and throw appropriate error

crates/router/src/compatibility/stripe/errors.rs

@@ -79,6 +79,9 @@ pub enum StripeErrorCode {
     #[error(error_type = StripeErrorType::InvalidRequestError, code = "resource_missing", message = "No such config")]
     ConfigNotFound,
 
+    #[error(error_type = StripeErrorType::InvalidRequestError, code = "duplicate_resource", message = "Duplicate config")]
+    DuplicateConfig,
+
     #[error(error_type = StripeErrorType::InvalidRequestError, code = "resource_missing", message = "No such payment")]
     PaymentNotFound,
 
@@ -460,6 +463,7 @@ impl From<errors::ApiErrorResponse> for StripeErrorCode {
             errors::ApiErrorResponse::MandateActive => Self::MandateActive, //not a stripe code
             errors::ApiErrorResponse::CustomerRedacted => Self::CustomerRedacted, //not a stripe code
             errors::ApiErrorResponse::ConfigNotFound => Self::ConfigNotFound, // not a stripe code
+            errors::ApiErrorResponse::DuplicateConfig => Self::DuplicateConfig, // not a stripe code
             errors::ApiErrorResponse::DuplicateRefundRequest => Self::DuplicateRefundRequest,
             errors::ApiErrorResponse::DuplicatePayout { payout_id } => {
                 Self::DuplicatePayout { payout_id }
@@ -575,6 +579,7 @@ impl actix_web::ResponseError for StripeErrorCode {
             | Self::RefundNotFound
             | Self::CustomerNotFound
             | Self::ConfigNotFound
+            | Self::DuplicateConfig
             | Self::ClientSecretNotFound
             | Self::PaymentNotFound
             | Self::PaymentMethodNotFound

crates/router/src/core/configs.rs

@@ -17,7 +17,7 @@ pub async fn set_config(
             config: config.value,
         })
         .await
-        .change_context(errors::ApiErrorResponse::InternalServerError)
+        .to_duplicate_response(errors::ApiErrorResponse::DuplicateConfig)
         .attach_printable("Unknown error, while setting config key")?;
 
     Ok(ApplicationResponse::Json(config.foreign_into()))

crates/router/src/core/errors/api_error_response.rs

@@ -137,6 +137,8 @@ pub enum ApiErrorResponse {
     DuplicatePayment { payment_id: String },
     #[error(error_type = ErrorType::DuplicateRequest, code = "HE_01", message = "The payout with the specified payout_id '{payout_id}' already exists in our records")]
     DuplicatePayout { payout_id: String },
+    #[error(error_type = ErrorType::DuplicateRequest, code = "HE_01", message = "The config with the specified key already exists in our records")]
+    DuplicateConfig,
     #[error(error_type = ErrorType::ObjectNotFound, code = "HE_02", message = "Refund does not exist in our records")]
     RefundNotFound,
     #[error(error_type = ErrorType::ObjectNotFound, code = "HE_02", message = "Customer does not exist in our records")]

crates/router/src/core/errors/transformers.rs

@@ -143,6 +143,9 @@ impl ErrorSwitch<api_models::errors::types::ApiErrorResponse> for ApiErrorRespon
             }
             Self::ConfigNotFound => {
                 AER::NotFound(ApiError::new("HE", 2, "Config key does not exist in our records.", None))
+            },
+            Self::DuplicateConfig => {
+                AER::BadRequest(ApiError::new("HE", 1, "The config with the specified key already exists in our records", None))
             }
             Self::PaymentNotFound => {
                 AER::NotFound(ApiError::new("HE", 2, "Payment does not exist in our records", None))