fix to only call cb for session id who initiated the event

examples/sse-with-state/event/listener.go

@@ -1,16 +1,13 @@
 package event
 
 import (
-	"crypto/sha256"
 	"fmt"
 	"github.com/google/uuid"
 	"github.com/maddalax/htmgo/framework/h"
 	"github.com/maddalax/htmgo/framework/service"
 	"github.com/puzpuzpuz/xsync/v3"
-	"runtime"
 	"sse-with-state/sse"
 	"sse-with-state/state"
-	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -41,35 +38,6 @@ var serverSideMessageListener = make(chan ServerSideEvent, 100)
 var lock = sync.Mutex{}
 var callingHandler = atomic.Bool{}
 
-func getCallerHash() string {
-	pc := make([]uintptr, 1000) // Adjust the size if you need a deeper stack trace
-	n := runtime.Callers(2, pc) // Skip 2: runtime.Callers() and printCallers()
-
-	frames := runtime.CallersFrames(pc[:n])
-	calls := make([]string, 0)
-	hitBegin := false
-
-	for {
-		frame, more := frames.Next()
-		calls = append(calls, fmt.Sprintf("%s:%d", frame.Function, frame.Line))
-		if strings.Contains(frame.Function, "runtime.goexit") {
-			hitBegin = true
-		}
-		if !more {
-			break
-		}
-	}
-
-	if !hitBegin {
-		fmt.Printf("hitBegin: %v\n", hitBegin)
-		panic("unable to add handler, stack trace too deep, maximum 1000, unable to find runtime.goexit")
-	}
-
-	joined := strings.Join(calls, ",")
-	hash := sha256.Sum256([]byte(joined))
-	return fmt.Sprintf("%x", hash)
-}
-
 func AddServerSideHandler(ctx *h.RequestContext, event string, handler Handler) *h.AttributeMapOrdered {
 	// If we are already in a handler, we don't want to add another handler
 	// this can happen if the handler renders another element that has a handler
@@ -104,11 +72,11 @@ func storeHashForSession(sessionId state.SessionId, hash KeyHash) {
 	m[hash] = true
 }
 
-func PushServerSideEvent(sessionId state.SessionId, event string) {
+func PushServerSideEvent(data HandlerData, event string, value map[string]any) {
 	serverSideMessageListener <- ServerSideEvent{
 		Event:     event,
-		Payload:   make(map[string]any),
-		SessionId: sessionId,
+		Payload:   value,
+		SessionId: data.SessionId,
 	}
 }
 
@@ -134,22 +102,38 @@ func StartListener(locator *service.Locator) {
 			select {
 			case sevent := <-serverSideMessageListener:
 				fmt.Printf("received server side event: %s\n", sevent.Event)
+				// TODO optimize this
 				hashes, ok := serverEventNamesToHash.Load(sevent.Event)
-				if ok {
-					for hash := range hashes {
+				hashesForSession, ok2 := sessionIdToHashes.Load(sevent.SessionId)
+
+				subset := make(map[KeyHash]bool)
+				for hash := range hashes {
+					if _, ok := hashesForSession[hash]; ok {
+						subset[hash] = true
+					}
+				}
+
+				if ok && ok2 {
+					lock.Lock()
+					callingHandler.Store(true)
+					wg := sync.WaitGroup{}
+					for hash := range subset {
 						cb, ok := handlers.Load(hash)
 						if ok {
-							lock.Lock()
-							callingHandler.Store(true)
-							cb(HandlerData{
-								SessionId: sevent.SessionId,
-								Socket:    manager.Get(string(sevent.SessionId)),
-								Manager:   manager,
-							})
-							callingHandler.Store(false)
-							lock.Unlock()
+							wg.Add(1)
+							go func(e ServerSideEvent) {
+								defer wg.Done()
+								cb(HandlerData{
+									SessionId: e.SessionId,
+									Socket:    manager.Get(string(e.SessionId)),
+									Manager:   manager,
+								})
+							}(sevent)
 						}
 					}
+					wg.Wait()
+					callingHandler.Store(false)
+					lock.Unlock()
 				}
 
 			case event := <-socketMessageListener:

examples/sse-with-state/pages/index.go

@@ -3,6 +3,7 @@ package pages
 import (
 	"fmt"
 	"github.com/maddalax/htmgo/framework/h"
+	"sse-with-state/event"
 	"sse-with-state/partials"
 	"sse-with-state/state"
 )
@@ -21,6 +22,12 @@ func IndexPage(ctx *h.RequestContext) *h.Page {
 
 				partials.Repeater(ctx, partials.RepeaterProps{
 					Id: "repeater-1",
+					OnAdd: func(data event.HandlerData) {
+						event.PushServerSideEvent(data, "increment", map[string]any{})
+					},
+					OnRemove: func(data event.HandlerData, index int) {
+						event.PushServerSideEvent(data, "decrement", map[string]any{})
+					},
 					AddButton: h.Button(
 						h.Text("+ Add Item"),
 					),

examples/sse-with-state/partials/index.go

@@ -19,6 +19,7 @@ func UseState[T any](sessionId state.SessionId, key string, initial T) (func() T
 type Counter struct {
 	Count     func() int
 	Increment func()
+	Decrement func()
 }
 
 func UseCounter(sessionId state.SessionId, id string) Counter {
@@ -28,9 +29,14 @@ func UseCounter(sessionId state.SessionId, id string) Counter {
 		set(get() + 1)
 	}
 
+	var decrement = func() {
+		set(get() - 1)
+	}
+
 	return Counter{
 		Count:     get,
 		Increment: increment,
+		Decrement: decrement,
 	}
 }
 
@@ -66,16 +72,10 @@ func CounterForm(ctx *h.RequestContext, props CounterProps) *h.Element {
 				counter.Increment()
 				event.PushElement(data, CounterForm(ctx, props))
 			}),
-			//OnMouseOver(ctx, func(data event.HandlerData) {
-			//	counter.Increment()
-			//	updated := CounterForm(ctx, props)
-			//	event.PushElement(data, updated)
-			//}),
-			//OnClick(ctx, func(data event.HandlerData) {
-			//	counter.Increment()
-			//	updated := CounterForm(ctx, props)
-			//	event.PushElement(data, updated)
-			//}),
+			OnServerSideEvent(ctx, "decrement", func(data event.HandlerData) {
+				counter.Decrement()
+				event.PushElement(data, CounterForm(ctx, props))
+			}),
 		),
 	)
 }

examples/sse-with-state/partials/repeater.go

@@ -13,6 +13,8 @@ type RepeaterProps struct {
 	DefaultItems []*h.Element
 	Id           string
 	currentIndex int
+	OnAdd        func(data event.HandlerData)
+	OnRemove     func(data event.HandlerData, index int)
 }
 
 func (props *RepeaterProps) itemId(index int) string {
@@ -33,6 +35,7 @@ func repeaterItem(ctx *h.RequestContext, item *h.Element, index int, props *Repe
 			h.ClassIf(index == 0, "opacity-0 disabled"),
 			h.If(index == 0, h.Disabled()),
 			OnClick(ctx, func(data event.HandlerData) {
+				props.OnRemove(data, index)
 				props.currentIndex--
 				event.PushElement(data,
 					h.Div(
@@ -59,7 +62,7 @@ func Repeater(ctx *h.RequestContext, props RepeaterProps) *h.Element {
 			h.Class("flex justify-center"),
 			props.AddButton,
 			OnClick(ctx, func(data event.HandlerData) {
-				event.PushServerSideEvent(data.SessionId, "increment")
+				props.OnAdd(data)
 				event.PushElement(data,
 					h.Div(
 						h.Attribute("hx-swap-oob", "beforebegin:#"+props.addButtonId()),