Made cancel and abort handlers instead of abort being a special signal type

event.go

@@ -186,15 +186,44 @@ func RunEvent(event Event) error {
   return nil
 }
 
-func AbortEvent(event Event) error {
+func EventAbort(event Event) func(signal GraphSignal) (string, error) {
-  signal := NewSignal(event, "abort")
+  return func(signal GraphSignal) (string, error) {
-  SendUpdate(event, signal)
+    if signal.Description() == event.ID() {
+      AbortChildren(event)
+      return "", errors.New(fmt.Sprintf("%s aborted by signal", event.ID()))
+    }
+    return "wait", nil
+  }
+}
+
+func EventCancel(event Event) func(signal GraphSignal) (string, error) {
+  return func(signal GraphSignal) (string, error) {
+    if signal.Description() == event.ID() {
+      CancelChildren(event)
+      return "", nil
+    }
+    return "wait", nil
+  }
+}
+
+func CancelChildren(event Event) {
   event.LockChildren()
   for _, child := range(event.Children()) {
-    AbortEvent(child)
+    signal := NewSignal(event, "cancel")
+    signal.description = child.ID()
+    SendUpdate(child, signal)
+  }
+  event.UnlockChildren()
+}
+
+func AbortChildren(event Event) {
+  event.LockChildren()
+  for _, child := range(event.Children()) {
+    signal := NewSignal(event, "abort")
+    signal.description = child.ID()
+    SendUpdate(child, signal)
   }
   event.UnlockChildren()
-  return nil
 }
 
 func LockResources(event Event) error {
@@ -287,15 +316,11 @@ func EventWait(event Event) (func() (string, error)) {
       } else {
         log.Logf("event", "EVENT_SIGNAL: %s %s nil -> %+v", event.Name(), signal.Last(), signal)
       }
-      if signal.Type() == "abort" {
-        return "", errors.New("State machine aborted by signal")
-      } else {
       signal_fn, exists := event.Handler(signal.Type())
       if exists == true {
         log.Logf("event", "EVENT_HANDLER: %s - %s", event.Name(), signal.Type())
         return signal_fn(signal)
       }
-      }
       return "wait", nil
     case <- event.Timeout():
       log.Logf("event", "EVENT_TIMEOUT %s - NEXT_STATE: %s", event.Name(), event.TimeoutAction())
@@ -330,6 +355,8 @@ func NewEvent(name string, description string, required_resources []Resource) (*
   event_ptr := &event
 
   event_ptr.actions["wait"] = EventWait(event_ptr)
+  event_ptr.handlers["abort"] = EventAbort(event_ptr)
+  event_ptr.handlers["cancel"] = EventCancel(event_ptr)
 
   event_ptr.actions["start"] = func() (string, error) {
     return "", nil
@@ -372,6 +399,8 @@ func NewEventQueue(name string, description string, required_resources []Resourc
   }
 
   queue.actions["wait"] = EventWait(queue)
+  queue.handlers["abort"] = EventAbort(queue)
+  queue.handlers["cancel"] = EventCancel(queue)
 
   queue.actions["start"] = func() (string, error) {
     return "queue_event", nil
@@ -389,7 +418,6 @@ func NewEventQueue(name string, description string, required_resources []Resourc
     }
     sort.SliceStable(copied_events, less)
 
-    wait := false
     needed_resources := map[string]Resource{}
     for _, event := range(copied_events) {
       // make sure all the required resources are registered to update the event
@@ -399,7 +427,6 @@ func NewEventQueue(name string, description string, required_resources []Resourc
 
       info := queue.ChildInfo(event).(*EventQueueInfo)
       if info.state == "queued" {
-        wait = true
         // Try to lock it
         err := LockResources(event)
         // start in new goroutine
@@ -418,8 +445,6 @@ func NewEventQueue(name string, description string, required_resources []Resourc
             FinishEvent(event)
           }(event, info, queue)
         }
-      } else if info.state == "running" {
-        wait = true
       }
     }
 
@@ -435,11 +460,7 @@ func NewEventQueue(name string, description string, required_resources []Resourc
 
     queue.UnlockChildren()
 
-    if wait == true {
     return "wait", nil
-    } else {
-      return "", nil
-    }
   }
 
   queue.handlers["resource_connected"] = func(signal GraphSignal) (string, error) {
@@ -509,3 +530,52 @@ func (event * BaseEvent) addChild(child Event, info EventInfo) {
   event.children = append(event.children, child)
   event.child_info[child.ID()] = info
 }
+
+type GQLEvent struct {
+  BaseEvent
+  abort chan error
+}
+
+func NewGQLEvent(listen string, child Event) * GQLEvent {
+  event := &GQLEvent{
+    BaseEvent: NewBaseEvent("GQL Handler", "", []Resource{}),
+    abort: make(chan error, 1),
+  }
+
+  event.actions["wait"] = EventWait(event)
+
+  event.handlers["abort"] = func (signal GraphSignal) (string, error) {
+    if signal.Description() == event.ID() {
+      event.abort <- nil
+      AbortChildren(event)
+      return "", errors.New(fmt.Sprintf("%s aborted by signal", event.ID()))
+    }
+    return "wait", nil
+  }
+
+  event.handlers["cancel"] = func (signal GraphSignal) (string, error) {
+    if signal.Description() == event.ID() {
+      event.abort <- nil
+      CancelChildren(event)
+      return "", nil
+    }
+    return "wait", nil
+  }
+
+  event.actions["start"] = func() (string, error) {
+    // start the gql handler goroutine
+    log.Logf("gql", "Starting GQL thread for %s", event.ID())
+    go func(event * GQLEvent) {
+      for true {
+        select {
+        case <- event.abort:
+          log.Logf("gql", "Stopping GQL thread for %s", event.ID())
+          break
+        }
+      }
+    }(event)
+    return "wait", nil
+  }
+
+  return event
+}

go.mod

@@ -5,6 +5,7 @@ go 1.20
 require (
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/graphql-go/graphql v0.8.1 // indirect
+	github.com/graphql-go/handler v0.2.3 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/rs/zerolog v1.29.1 // indirect

go.sum

@@ -11,6 +11,8 @@ github.com/graph-gophers/graphql-go v1.5.0 h1:fDqblo50TEpD0LY7RXk/LFVYEVqo3+tXMN
 github.com/graph-gophers/graphql-go v1.5.0/go.mod h1:YtmJZDLbF1YYNrlNAuiO5zAStUWc3XZT07iGsVqe1Os=
 github.com/graphql-go/graphql v0.8.1 h1:p7/Ou/WpmulocJeEx7wjQy611rtXGQaAcXGqanuMMgc=
 github.com/graphql-go/graphql v0.8.1/go.mod h1:nKiHzRM0qopJEwCITUuIsxk9PlVlwIiiI8pnJEhordQ=
+github.com/graphql-go/handler v0.2.3 h1:CANh8WPnl5M9uA25c2GBhPqJhE53Fg0Iue/fRNla71E=
+github.com/graphql-go/handler v0.2.3/go.mod h1:leLF6RpV5uZMN1CdImAxuiayrYYhOk33bZciaUGaXeU=
 github.com/looplab/fsm v1.0.1 h1:OEW0ORrIx095N/6lgoGkFkotqH6s7vaFPsgjLAaF5QU=
 github.com/looplab/fsm v1.0.1/go.mod h1:PmD3fFvQEIsjMEfvZdrCDZ6y8VwKTwWNjlpEr6IKPO4=
 github.com/mattn/go-colorable v0.1.12 h1:jF+Du6AlPIjs2BiUiQlKOX0rt3SujHxPnksPKZbaA40=

graph.go

@@ -22,7 +22,7 @@ type DefaultLogger struct {
 }
 
 var log DefaultLogger = DefaultLogger{loggers: map[string]zerolog.Logger{}}
-var all_components = []string{"update", "graph", "event", "resource", "manager", "test"}
+var all_components = []string{"update", "graph", "event", "resource", "manager", "test", "gql"}
 
 func (logger * DefaultLogger) Init(components []string) error {
   file, err := os.OpenFile("test.log", os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0666)
@@ -40,9 +40,11 @@ func (logger * DefaultLogger) Init(components []string) error {
   }
 
   writer := io.MultiWriter(file, os.Stdout)
-  for _, c := range([]string{"event"}) {
+  for _, c := range(all_components) {
     if component_enabled(c) == true {
       logger.loggers[c] = zerolog.New(writer).With().Timestamp().Str("component", c).Logger()
+    } else {
+      panic(fmt.Sprintf("%s is not a component in DefaultLogger", c))
     }
   }
   return nil

main.go

@@ -271,11 +271,15 @@ func main() {
       case update := <- arena_4_client.update:
         arena_4_client.process_update(update)
       }
+      if arena_1_client.games_done == 12 &&
+         arena_2_client.games_done == 12 &&
+         arena_3_client.games_done == 12 &&
+         arena_4_client.games_done == 12 {
+        signal := NewSignal(nil, "cancel")
+        signal.description = event_manager.root_event.ID()
+        SendUpdate(event_manager.root_event, signal)
+      }
     }
-  }()
-
-  go func() {
-    event_manager.GQL()
   }()
 
   log.Logf("test", "Starting event_manager")

manager.go

@@ -16,7 +16,7 @@ type EventManager struct {
   aborts []chan error
 }
 
-graphiql_string := `
+const graphiql_string string = `
 <!--
  *  Copyright (c) 2021 GraphQL Contributors
  *  All rights reserved.
@@ -76,7 +76,7 @@ graphiql_string := `
       root.render(
         React.createElement(GraphiQL, {
           fetcher: GraphiQL.createFetcher({
-            url: 'https://swapi-graphql.netlify.app/.netlify/functions/index',
+            url: 'http://localhost:8080/gql',
           }),
           defaultEditorToolsVisibility: true,
         }),
@@ -87,22 +87,32 @@ graphiql_string := `
 `
 
 func (manager * EventManager) GQL() error {
-  rootQuery := graphql.ObjectConfig{Name: "RootQuery", Field: fields}
+  fields := graphql.Fields{
+    "hello": &graphql.Field{
+      Type: graphql.String,
+      Resolve: func(p graphql.ResolveParams)(interface{}, error) {
+        return "world", nil
+      },
+    },
+  }
+  rootQuery := graphql.ObjectConfig{Name: "RootQuery", Fields: fields}
   schemaConfig := graphql.SchemaConfig{Query: graphql.NewObject(rootQuery)}
   schema, err := graphql.NewSchema(schemaConfig)
   if err != nil {
     return err
   }
 
-  h := handler.New(&handler.Config{Schema: &schema, })
+  h := handler.New(&handler.Config{Schema: &schema, Pretty: true})
-  server := http.NewServeMux()
+  mux := http.NewServeMux()
-  server.Handle("/graphql", h)
+  mux.Handle("/gql", h)
-  server.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
+  mux.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
-    w.Header.Set("Content-Type", "text/html; charset=utf-8")
+    w.Header().Set("Content-Type", "text/html; charset=utf-8")
     w.WriteHeader(http.StatusOK)
     io.WriteString(w, graphiql_string)
   })
 
+  http.ListenAndServe(":8080", mux)
+
   return nil
 }
 

manager_test.go

@@ -18,12 +18,12 @@ func (t * graph_tester) WaitForValue(listener chan GraphSignal, signal_type stri
     case signal := <- listener:
       if signal.Type() == signal_type {
         if signal.Source() == nil || source == nil {
-          fmt.Printf("SIGNAL_TYPE_FOUND: %s - %s", signal.Type(), signal.Source())
+          fmt.Printf("SIGNAL_TYPE_FOUND: %s - %s\n", signal.Type(), signal.Source())
           if source == nil && signal.Source() == nil{
             return signal
           }
         } else {
-          fmt.Printf("SIGNAL_TYPE_FOUND: %s - %s", signal.Type(), signal.Source().Name())
+          fmt.Printf("SIGNAL_TYPE_FOUND: %s - %s\n", signal.Type(), signal.Source().Name())
           if signal.Source().ID() == source.ID() {
             return signal
           }
@@ -308,7 +308,7 @@ func TestStartBaseEvent(t * testing.T) {
 }
 
 func TestAbortEventQueue(t * testing.T) {
-  root_event := NewEventQueue("", "", []Resource{})
+  root_event := NewEventQueue("root_event", "", []Resource{})
   r := root_event.DoneResource()
   manager := NewEventManager(root_event, []Resource{})
 
@@ -318,7 +318,7 @@ func TestAbortEventQueue(t * testing.T) {
     t.Fatal(err)
   }
   LockResource(r1, root_event)
-  e1 := NewEvent("1", "", []Resource{r1})
+  e1 := NewEvent("event_1", "", []Resource{r1})
   e1_info := NewEventQueueInfo(1)
   // Add an event so that the queue doesn't auto complete
   err = manager.AddEvent(root_event, e1, e1_info)
@@ -330,7 +330,9 @@ func TestAbortEventQueue(t * testing.T) {
   // start the queue and check that all the events are executed
   go func() {
     time.Sleep(100 * time.Millisecond)
-    AbortEvent(root_event)
+    abort_signal := NewSignal(nil, "abort")
+    abort_signal.description = root_event.ID()
+    SendUpdate(root_event, abort_signal)
   }()
 
   err = manager.Run()
@@ -359,7 +361,7 @@ func TestStartEventQueue(t * testing.T) {
   if err != nil {
     t.Fatal("Failed to add e1 to manager")
   }
-  (*graph_tester)(t).CheckForValue(rel, "No update on root_event after adding e1")
+  (*graph_tester)(t).WaitForValue(rel, "child_added", root_event, time.Second, "No update on root_event after adding e1")
 
   e2 := NewEvent("e2", "", []Resource{res_1})
   e2_r := e2.DoneResource()
@@ -368,7 +370,7 @@ func TestStartEventQueue(t * testing.T) {
   if err != nil {
     t.Fatal("Failed to add e2 to manager")
   }
-  (*graph_tester)(t).CheckForValue(rel, "No update on root_event after adding e2")
+  (*graph_tester)(t).WaitForValue(rel, "child_added", root_event, time.Second, "No update on root_event after adding e2")
 
   e3 := NewEvent("e3", "", []Resource{res_2})
   e3_r := e3.DoneResource()
@@ -377,22 +379,27 @@ func TestStartEventQueue(t * testing.T) {
   if err != nil {
     t.Fatal("Failed to add e3 to manager")
   }
-  (*graph_tester)(t).CheckForValue(rel, "No update on root_event after adding e3")
+  (*graph_tester)(t).WaitForValue(rel, "child_added", root_event, time.Second, "No update on root_event after adding e3")
-
-  e1_l := e1.UpdateChannel();
-  e2_l := e2.UpdateChannel();
-  e3_l := e3.UpdateChannel();
 
   // Abort the event after 5 seconds just in case
   go func() {
     time.Sleep(5 * time.Second)
     if r.Owner() != nil {
-      AbortEvent(root_event)
+      abort_signal := NewSignal(nil, "abort")
+      abort_signal.description = root_event.ID()
+      SendUpdate(root_event, abort_signal)
     }
   }()
 
   // Now that an event manager is constructed with a queue and 3 basic events
   // start the queue and check that all the events are executed
+  go func() {
+    (*graph_tester)(t).WaitForValue(rel, "event_done", e3, time.Second, "No event_done for e3")
+    signal := NewSignal(nil, "cancel")
+    signal.description = root_event.ID()
+    SendUpdate(root_event, signal)
+  }()
+
   err = manager.Run()
   if err != nil {
     t.Fatal(err)
@@ -403,17 +410,14 @@ func TestStartEventQueue(t * testing.T) {
     t.Fatal("root event was not finished after starting")
   }
 
-  (*graph_tester)(t).WaitForValue(e1_l, "event_done", e1, time.Second, "no e1 event_done")
   if e1_r.Owner() != nil {
     t.Fatal("e1 was not completed")
   }
 
-  (*graph_tester)(t).WaitForValue(e2_l, "event_done", e2, time.Second, "no e2 event_done")
   if e2_r.Owner() != nil {
     t.Fatal(fmt.Sprintf("e2 was not completed"))
   }
 
-  (*graph_tester)(t).WaitForValue(e3_l, "event_done", e3, time.Second, "no e3 event_done")
   if e3_r.Owner() != nil {
     t.Fatal("e3 was not completed")
   }

vex.go

@@ -128,11 +128,9 @@ func NewVexEvent(name string, description string) * VexEvent {
   }
 
   event.actions["wait"] = EventWait(event)
+  event.handlers["abort"] = EventAbort(event)
   event.actions["start"] = func() (string, error) {
     log.Logf("vex", "STARTING_VEX_TOURNAMENT %s", event.Name())
-    go func() {
-      
-    }()
     return "wait", nil
   }
 
@@ -169,6 +167,7 @@ func NewMatch(alliance0 * Alliance, alliance1 * Alliance, arena Arena) * Match {
   }
 
   match.actions["wait"] = EventWait(match)
+  match.handlers["abort"] = EventAbort(match)
 
   match.actions["start"] = func() (string, error) {
     log.Logf("vex", "STARTING_MATCH %s", match.Name())

vex_test.go

@@ -144,7 +144,9 @@ func TestNewMatch(t *testing.T) {
     time.Sleep(time.Second * 20)
     if r.Owner() != nil {
       pprof.Lookup("goroutine").WriteTo(os.Stdout, 1)
-      AbortEvent(root_event)
+      abort_signal := NewSignal(root_event, "abort")
+      abort_signal.description = root_event.ID()
+      SendUpdate(root_event, abort_signal)
     }
   }()
 
@@ -164,6 +166,9 @@ func TestNewMatch(t *testing.T) {
     SendUpdate(arena, driver_signal)
     (*graph_tester)(t).WaitForValue(arena_c, "driver_running", match, 1*time.Second, "no driver_running")
     (*graph_tester)(t).WaitForValue(arena_c, "driver_done", match, 6*time.Second, "no driver_done")
+    cancel_signal := NewSignal(nil, "cancel")
+    cancel_signal.description = root_event.ID()
+    SendUpdate(root_event, cancel_signal)
   }(arena_c)
 
   err := event_manager.Run()