feat: added respond signal

Author: raphael-goetz

src/context/signal.rs

@@ -3,9 +3,23 @@ use crate::error::RuntimeError;
 
 #[derive(Debug)]
 pub enum Signal {
+    // Will be signaled if a function has been executed successfully
     Success(Value),
+    // Will be signaled if
+    // - a function recieves wrong parameter
+    // - a function throws an error
+    // - taurus itself throwns an error
+    // - will stop the execution of the flow completly
     Failure(RuntimeError),
+    // Will be signaled if the `return` function has been executed
+    // - will break the current context and return the value to the upper node
     Return(Value),
+    // Will be signaled if the `respond` function has been executed
+    // - will stop the execution of the flow completly 
+    // - will return the value to the adapter
+    Respond(Value),
+    // Will be signaled if the `stop` function has been executed
+    // - will stop the execution of the flow completly 
     Stop
 }
 
@@ -17,6 +31,7 @@ impl PartialEq for Signal {
                 | (Signal::Failure(_), Signal::Failure(_))
                 | (Signal::Return(_), Signal::Return(_))
                 | (Signal::Stop, Signal::Stop)
+                | (Signal::Respond(_), Signal::Respond(_))
         )
     }
-}
+}

src/executor/mod.rs

@@ -47,6 +47,7 @@ impl<'a> Executor<'a> {
                     }
                     Signal::Failure(error) => return Signal::Failure(error),
                     Signal::Stop => return Signal::Stop,
+                    Signal::Respond(value) => return Signal::Respond(value)
                 }
             }
 
@@ -71,6 +72,7 @@ impl<'a> Executor<'a> {
                 }
                 Signal::Failure(runtime_error) => return Signal::Failure(runtime_error),
                 Signal::Return(value) => return Signal::Return(value),
+                Signal::Respond(value) => return Signal::Respond(value),
                 Signal::Stop => return Signal::Stop,
             }
         }