add newrelic attribute for speaker

src/newrelic_logger.rs

@@ -26,11 +26,30 @@ impl NewRelicLogger {
     }
   }
 
-  pub fn web_transaction(&self, transaction_name: &str) -> Option<Transaction> {
+  pub fn web_transaction(&self, transaction_name: &str) -> MaybeNewRelicTransaction {
     if let Some(ref newrelic_api) = self.newrelic_api {
       info!("Logging request to NewRelic");
-      return newrelic_api.web_transaction(transaction_name).ok();
+      let maybe_transaction = newrelic_api.web_transaction(transaction_name).ok();
+      return MaybeNewRelicTransaction::from_optional(maybe_transaction);
     }
-    None
+    MaybeNewRelicTransaction::from_optional(None)
   }
 }
+
+pub struct MaybeNewRelicTransaction {
+  transaction: Option<Transaction>,
+}
+
+impl MaybeNewRelicTransaction {
+  pub fn from_optional(optional: Option<Transaction>) -> Self {
+    Self {
+      transaction: optional,
+    }
+  }
+
+  pub fn add_attribute(&self, name: &str, value: &str) {
+    if let Some(ref transaction) = self.transaction {
+      let _result = transaction.add_attribute(name, value);
+    }
+  }
+}