[#29772][Go SDK] Add EventTime Timer tests.

sdks/go/pkg/beam/core/runtime/exec/translate.go

@@ -798,7 +798,7 @@ func (b *builder) makeLink(from string, id linkID) (Node, error) {
 		if err != nil {
 			return nil, err
 		}
-		u = &MapWindows{UID: b.idgen.New(), Fn: mapper, Out: out[0]}
+		u = &MapWindows{UID: b.idgen.New(), Fn: mapper, Out: out[0], FnUrn: fn.GetUrn()}
 
 	case graphx.URNFlatten:
 		u = &Flatten{UID: b.idgen.New(), N: len(transform.Inputs), Out: out[0]}

sdks/go/pkg/beam/core/runtime/exec/window.go

@@ -105,6 +105,8 @@ type MapWindows struct {
 	UID UnitID
 	Fn  WindowMapper
 	Out Node
+
+	FnUrn string // Keep the urn for debugging purposes.
 }
 
 // ID returns the UnitID for this unit.
@@ -122,11 +124,17 @@ func (m *MapWindows) StartBundle(ctx context.Context, id string, data DataContex
 }
 
 func (m *MapWindows) ProcessElement(ctx context.Context, elm *FullValue, values ...ReStream) error {
-	w, ok := elm.Elm2.(window.IntervalWindow)
-	if !ok {
-		return errors.Errorf("not an IntervalWindow, got %T", elm.Elm2)
+	// MapWindows ends up with the wrappedDecode path, which can pass the value window through the
+	// Window field. Use that as the default for resilience to a change to match the coder correctly.
+	win := elm.Windows[0]
+	if elm.Elm2 != nil {
+		w, ok := elm.Elm2.(typex.Window)
+		if !ok {
+			return errors.Errorf("not a Window Value, got %T", elm.Elm2)
+		}
+		win = w
 	}
-	newW, err := m.Fn.MapWindow(w)
+	newW, err := m.Fn.MapWindow(win)
 	if err != nil {
 		return err
 	}
@@ -151,7 +159,7 @@ func (m *MapWindows) Down(_ context.Context) error {
 }
 
 func (m *MapWindows) String() string {
-	return fmt.Sprintf("MapWindows[%v]. Out:%v", m.Fn, m.Out.ID())
+	return fmt.Sprintf("MapWindows[%v]. Out:%v", m.FnUrn, m.Out.ID())
 }
 
 // WindowMapper defines an interface maps windows from a main input window space

sdks/go/test/integration/integration.go

@@ -136,6 +136,9 @@ var portableFilters = []string{
 	"TestMapStateClear",
 	"TestSetState",
 	"TestSetStateClear",
+
+	// The portable runner does not appear to support timers. (extra elements)
+	"TestTimers.*",
 }
 
 var prismFilters = []string{
@@ -158,6 +161,9 @@ var prismFilters = []string{
 	"TestFhirIO.*",
 	// OOMs currently only lead to heap dumps on Dataflow runner
 	"TestOomParDo",
+
+	// The prism runner does not support timers https://github.com/apache/beam/issues/29772.
+	"TestTimers.*",
 }
 
 var flinkFilters = []string{
@@ -181,6 +187,9 @@ var flinkFilters = []string{
 	"TestMapStateClear",
 	"TestSetStateClear",
 	"TestSetState",
+
+	// Flink does not appear to support timers. (missing timer elements)
+	"TestTimers.*",
 }
 
 var samzaFilters = []string{
@@ -219,6 +228,9 @@ var samzaFilters = []string{
 	"TestSetStateClear",
 	// TODO(https://github.com/apache/beam/issues/26126): Java runner issue (AcitveBundle has no regsitered handler)
 	"TestDebeziumIO_BasicRead",
+
+	// Samza does not appear to support timers. (missing timer elements)
+	"TestTimers.*",
 }
 
 var sparkFilters = []string{
@@ -250,6 +262,9 @@ var sparkFilters = []string{
 	"TestMapStateClear",
 	"TestSetStateClear",
 	"TestSetState",
+
+	// Spark does not appear to support timers. (Missing all elements)
+	"TestTimers.*",
 }
 
 var dataflowFilters = []string{

sdks/go/test/integration/primitives/timers.go

@@ -0,0 +1,131 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package primitives
+
+import (
+	"context"
+	"strconv"
+
+	"github.com/apache/beam/sdks/v2/go/pkg/beam"
+	"github.com/apache/beam/sdks/v2/go/pkg/beam/core/state"
+	"github.com/apache/beam/sdks/v2/go/pkg/beam/core/timers"
+	"github.com/apache/beam/sdks/v2/go/pkg/beam/register"
+	"github.com/apache/beam/sdks/v2/go/pkg/beam/testing/passert"
+)
+
+// Based on https://github.com/apache/beam/blob/master/runners/flink/src/test/java/org/apache/beam/runners/flink/PortableTimersExecutionTest.java
+
+func init() {
+	register.DoFn2x0[[]byte, func(string, int)](&inputFn[string, int]{})
+	register.DoFn6x0[beam.Window, state.Provider, timers.Provider, string, int, func(kv[string, int])](&eventTimeFn{})
+	register.Emitter2[string, int]()
+	register.Emitter1[kv[string, int]]()
+}
+
+type kv[K, V any] struct {
+	Key   K
+	Value V
+}
+
+func kvfn[K, V any](k K, v V) kv[K, V] {
+	return kv[K, V]{k, v}
+}
+
+type inputFn[K, V any] struct {
+	Inputs []kv[K, V]
+}
+
+func (fn *inputFn[K, V]) ProcessElement(_ []byte, emit func(K, V)) {
+	for _, in := range fn.Inputs {
+		emit(in.Key, in.Value)
+	}
+}
+
+type eventTimeFn struct {
+	Foo    timers.EventTime
+	Sizzle state.Value[string]
+
+	Offset      int
+	TimerOutput int
+}
+
+func (fn *eventTimeFn) ProcessElement(w beam.Window, sp state.Provider, tp timers.Provider, key string, value int, emit func(kv[string, int])) {
+	fn.Foo.Set(tp, w.MaxTimestamp().ToTime())
+	fn.Sizzle.Write(sp, key)
+	emit(kvfn(key, value+fn.Offset))
+}
+
+func (fn *eventTimeFn) OnTimer(ctx context.Context, ts beam.EventTime, sp state.Provider, tp timers.Provider, key string, timer timers.Context, emit func(kv[string, int])) {
+	switch timer.Family {
+	case fn.Foo.Family:
+		switch timer.Tag {
+		case "":
+			read, ok, err := fn.Sizzle.Read(sp)
+			if err != nil {
+				panic(err)
+			}
+			if !ok {
+				panic("State must be set.")
+			}
+			emit(kvfn(read, fn.TimerOutput))
+		}
+	default:
+		if fn.Foo.Family != timer.Family || timer.Tag != "" {
+			panic("unexpected timer family: " + timer.Family + " tag:" + timer.Tag + " want: " + fn.Foo.Family)
+		}
+	}
+}
+
+// TimersEventTime takes in an impulse transform and then validates
+// event time timer execution.
+//
+// The impulse is provided outside to swap between a bounded impulse, and
+// an unbounded one, because the Go SDK uses that to determine if a pipeline
+// is "streaming" or not. This matters at least for executions on Dataflow.
+//
+// Regardless,the pipelines should pass.
+func TimersEventTime(makeImp func(s beam.Scope) beam.PCollection) func(s beam.Scope) {
+	return func(s beam.Scope) {
+		var inputs, wantOutputs []kv[string, int]
+
+		offset := 5000
+		timerOutput := 4093
+
+		numKeys := 50
+		numDuplicateTimers := 15
+
+		for key := 0; key < numKeys; key++ {
+			k := strconv.Itoa(key)
+			wantOutputs = append(wantOutputs, kvfn(k, timerOutput))
+
+			for i := 0; i < numDuplicateTimers; i++ {
+				inputs = append(inputs, kvfn(k, i))
+				wantOutputs = append(wantOutputs, kvfn(k, i+offset))
+			}
+		}
+
+		imp := makeImp(s)
+
+		keyed := beam.ParDo(s, &inputFn[string, int]{
+			Inputs: inputs,
+		}, imp)
+		times := beam.ParDo(s, &eventTimeFn{
+			Offset:      offset,
+			TimerOutput: timerOutput,
+		}, keyed)
+		passert.EqualsList(s, times, wantOutputs)
+	}
+}

sdks/go/test/integration/primitives/timers_test.go

@@ -0,0 +1,41 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements.  See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You under the Apache License, Version 2.0
+// (the "License"); you may not use this file except in compliance with
+// the License.  You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package primitives
+
+import (
+	"testing"
+	"time"
+
+	"github.com/apache/beam/sdks/v2/go/pkg/beam"
+	"github.com/apache/beam/sdks/v2/go/pkg/beam/testing/ptest"
+	"github.com/apache/beam/sdks/v2/go/pkg/beam/transforms/periodic"
+	"github.com/apache/beam/sdks/v2/go/test/integration"
+)
+
+func TestTimers_EventTime_Bounded(t *testing.T) {
+	integration.CheckFilters(t)
+	ptest.BuildAndRun(t, TimersEventTime(beam.Impulse))
+}
+
+func TestTimers_EventTime_Unbounded(t *testing.T) {
+	integration.CheckFilters(t)
+	ptest.BuildAndRun(t, TimersEventTime(func(s beam.Scope) beam.PCollection {
+		now := time.Now()
+		return periodic.Impulse(s, now, now.Add(10*time.Second), 0, false)
+	}))
+}
+
+// TODO(https://github.com/apache/beam/issues/29772): Add ProcessingTime Timer tests.