Consolidate cancel and timeout logic

Cancel and timeout do very similar things when they happen: they
update the status of the taskrun, set the completion time and try
and delete the pod.

Today this is done for the two cases in different places, the code
structured differently and the behaviour slightly different:
- log levels of the messages are different
- cancel does not set the completion time
- cancel does not check if the error on pod deletion is a NotFound

This commit introduces "HasTimedOut" to tasktun_types, which
matches what "IsCancelled" does. It introduces a "killTaskRun"
function that can be used by both cancel and timeout, with the
only different being the "Reason" and termination message.
The timeout_check module is not necessary anymore.

The check for IsCancelled and HasTimedOut are move out of
"reconcile" into "Reconcile", so that now "Reconcile" checks:
- HasStarted
- isDone
- IsCancelled
- HasTimedOut
and finally, if applicable, it invokes "reconcile".

pkg/apis/pipeline/v1alpha1/taskrun_types.go

@@ -18,7 +18,9 @@ package v1alpha1
 
 import (
 	"fmt"
+	"time"
 
+	apisconfig "github.com/tektoncd/pipeline/pkg/apis/config"
 	"github.com/tektoncd/pipeline/pkg/apis/pipeline"
 	"github.com/tektoncd/pipeline/pkg/apis/pipeline/v1beta1"
 	corev1 "k8s.io/api/core/v1"
@@ -209,6 +211,29 @@ func (tr *TaskRun) IsCancelled() bool {
 	return tr.Spec.Status == TaskRunSpecStatusCancelled
 }
 
+// HasTimedOut returns true if the TaskRun runtime is beyond the allowed timeout
+func (tr *TaskRun) HasTimedOut() bool {
+	if tr.Status.StartTime.IsZero() {
+		return false
+	}
+	timeout := tr.GetTimeout()
+	// If timeout is set to 0 or defaulted to 0, there is no timeout.
+	if timeout == apisconfig.NoTimeoutDuration {
+		return false
+	}
+	runtime := time.Since(tr.Status.StartTime.Time)
+	return runtime > timeout
+}
+
+func (tr *TaskRun) GetTimeout() time.Duration {
+	// Use the platform default is no timeout is set
+	if tr.Spec.Timeout == nil {
+		return apisconfig.DefaultTimeoutMinutes * time.Minute
+	} else {
+		return tr.Spec.Timeout.Duration
+	}
+}
+
 // GetRunKey return the taskrun key for timeout handler map
 func (tr *TaskRun) GetRunKey() string {
 	// The address of the pointer is a threadsafe unique identifier for the taskrun

pkg/apis/pipeline/v1alpha1/taskrun_types_test.go

@@ -196,3 +196,40 @@ func TestTaskRunIsOfPipelinerun(t *testing.T) {
 		})
 	}
 }
+
+func TestHasTimedOut(t *testing.T) {
+	// IsZero reports whether t represents the zero time instant, January 1, year 1, 00:00:00 UTC
+	zeroTime := time.Date(1, 1, 1, 0, 0, 0, 0, time.UTC)
+	testCases := []struct {
+		name           string
+		taskRun        *v1alpha1.TaskRun
+		expectedStatus bool
+	}{{
+		name: "TaskRun not started",
+		taskRun: tb.TaskRun("test-taskrun-not-started", "foo", tb.TaskRunSpec(
+			tb.TaskRunTaskRef("task-name"),
+		), tb.TaskRunStatus(tb.StatusCondition(apis.Condition{}), tb.TaskRunStartTime(zeroTime))),
+		expectedStatus: false,
+	}, {
+		name: "TaskRun no timeout",
+		taskRun: tb.TaskRun("test-taskrun-no-timeout", "foo", tb.TaskRunSpec(
+			tb.TaskRunTaskRef("task-name"), tb.TaskRunTimeout(0),
+		), tb.TaskRunStatus(tb.StatusCondition(apis.Condition{}), tb.TaskRunStartTime(time.Now().Add(-15*time.Hour)))),
+		expectedStatus: false,
+	}, {
+		name: "TaskRun timed out",
+		taskRun: tb.TaskRun("test-taskrun-timeout", "foo", tb.TaskRunSpec(
+			tb.TaskRunTaskRef("task-name"), tb.TaskRunTimeout(10*time.Second),
+		), tb.TaskRunStatus(tb.StatusCondition(apis.Condition{}), tb.TaskRunStartTime(time.Now().Add(-15*time.Second)))),
+		expectedStatus: true,
+	}}
+
+	for _, tc := range testCases {
+		t.Run(tc.name, func(t *testing.T) {
+			result := tc.taskRun.HasTimedOut()
+			if d := cmp.Diff(result, tc.expectedStatus); d != "" {
+				t.Fatalf("-want, +got: %v", d)
+			}
+		})
+	}
+}