tiny post-GA tool to reduce exec frequency of periodics

Signed-off-by: Jakub Guzik <jguzik@redhat.com>

cmd/branchingconfigmanagers/frequency-reducer/main.go

@@ -0,0 +1,213 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"math/rand"
+	"regexp"
+	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	utilerrors "k8s.io/apimachinery/pkg/util/errors"
+
+	"github.com/openshift/ci-tools/pkg/api"
+	"github.com/openshift/ci-tools/pkg/api/ocplifecycle"
+	"github.com/openshift/ci-tools/pkg/config"
+	"gopkg.in/robfig/cron.v2"
+)
+
+type options struct {
+	config.ConfirmableOptions
+	currentOCPVersion string
+}
+
+func (o options) validate() error {
+	var errs []error
+	if err := o.ConfirmableOptions.Validate(); err != nil {
+		errs = append(errs, err)
+	}
+
+	return utilerrors.NewAggregate(errs)
+}
+
+func gatherOptions() options {
+	o := options{}
+	flag.StringVar(&o.currentOCPVersion, "current-release", "", "Current OCP version")
+
+	o.Bind(flag.CommandLine)
+	flag.Parse()
+
+	return o
+}
+
+func main() {
+	o := gatherOptions()
+	if err := o.validate(); err != nil {
+		logrus.Fatalf("Invalid options: %v", err)
+	}
+
+	ocpVersion, err := ocplifecycle.ParseMajorMinor(o.currentOCPVersion)
+	if err != nil {
+		logrus.Fatalf("Not valid --current-release: %v", err)
+	}
+
+	if err := o.ConfirmableOptions.Complete(); err != nil {
+		logrus.Fatalf("Couldn't complete the config options: %v", err)
+	}
+
+	if err := o.OperateOnCIOperatorConfigDir(o.ConfigDir, func(configuration *api.ReleaseBuildConfiguration, info *config.Info) error {
+		output := config.DataWithInfo{Configuration: *configuration, Info: *info}
+		updateIntervalFieldsForMatchedSteps(&output, *ocpVersion)
+
+		if err := output.CommitTo(o.ConfigDir); err != nil {
+			logrus.WithError(err).Fatal("commitTo failed")
+		}
+		return nil
+	}); err != nil {
+		logrus.WithError(err).Fatal("Could not branch configurations.")
+	}
+
+}
+
+func updateIntervalFieldsForMatchedSteps(
+	configuration *config.DataWithInfo,
+	version ocplifecycle.MajorMinor,
+) {
+	testVersion, err := ocplifecycle.ParseMajorMinor(extractVersion(configuration.Info.Metadata.Branch))
+	if err != nil {
+		return
+	}
+	if configuration.Info.Metadata.Org == "openshift" || configuration.Info.Metadata.Org == "openshift-priv" {
+		for _, test := range configuration.Configuration.Tests {
+			if !strings.Contains(test.As, "mirror-nightly-image") && !strings.Contains(test.As, "promote-") {
+				if test.Cron != nil {
+					// check if less then past past version
+					if testVersion.Less(ocplifecycle.MajorMinor{Major: version.Major, Minor: version.Minor - 2}) {
+						correctCron, err := isExecutedAtMostXTimesAMonth(*test.Cron, 1)
+						if err != nil {
+							logrus.Warningf("Can't parse cron string %s", *test.Cron)
+							continue
+						}
+						if !correctCron {
+							*test.Cron = generateMonthlyCron()
+						}
+					} else if testVersion.GetVersion() == version.GetPastPastVersion() {
+						correctCron, err := isExecutedAtMostXTimesAMonth(*test.Cron, 2)
+						if err != nil {
+							logrus.Warningf("Can't parse cron string %s", *test.Cron)
+							continue
+						}
+						if !correctCron {
+							*test.Cron = generateBiWeeklyCron()
+						}
+					} else if testVersion.GetVersion() == version.GetPastVersion() {
+						correctCron, err := isExecutedAtMostXTimesAMonth(*test.Cron, 4)
+						if err != nil {
+							logrus.Warningf("Can't parse cron string %s", *test.Cron)
+							continue
+						}
+						if !correctCron {
+							*test.Cron = generateWeeklyWeekendCron()
+						}
+					}
+				}
+				if test.Interval != nil {
+					if testVersion.Less(ocplifecycle.MajorMinor{Major: version.Major, Minor: version.Minor - 2}) {
+						duration, err := time.ParseDuration(*test.Interval)
+						if err != nil {
+							logrus.Warningf("Can't parse interval string %s", *test.Cron)
+							continue
+						}
+						if duration < time.Hour*24*28 {
+							cronExpr := generateWeeklyWeekendCron()
+							test.Cron = &cronExpr
+							test.Interval = nil
+						}
+					} else if testVersion.GetVersion() == version.GetPastPastVersion() {
+						duration, err := time.ParseDuration(*test.Interval)
+						if err != nil {
+							logrus.Warningf("Can't parse interval string %s", *test.Cron)
+							continue
+						}
+						if duration < time.Hour*24*14 {
+							cronExpr := generateBiWeeklyCron()
+							test.Cron = &cronExpr
+							test.Interval = nil
+						}
+					} else if testVersion.GetVersion() == version.GetPastVersion() {
+						duration, err := time.ParseDuration(*test.Interval)
+						if err != nil {
+							logrus.Warningf("Can't parse interval string %s", *test.Cron)
+							continue
+						}
+						if duration < time.Hour*24*7 {
+							cronExpr := generateWeeklyWeekendCron()
+							test.Cron = &cronExpr
+							test.Interval = nil
+						}
+					}
+				}
+			}
+		}
+	}
+}
+
+func isExecutedAtMostXTimesAMonth(cronExpr string, x int) (bool, error) {
+	switch strings.ToLower(cronExpr) {
+	case "@daily":
+		cronExpr = "0 0 * * *"
+	case "@weekly":
+		cronExpr = "0 0 * * 0"
+	case "@monthly":
+		cronExpr = "0 0 1 * *"
+	case "@yearly", "@annually":
+		cronExpr = "0 0 1 1 *"
+	}
+
+	schedule, err := cron.Parse(cronExpr)
+	if err != nil {
+		return false, err
+	}
+	start := time.Date(2024, time.January, 1, 0, 0, 0, 0, time.UTC)
+	end := start.AddDate(0, 1, 0)
+
+	executionCount := 0
+	for {
+		next := schedule.Next(start)
+		if next.After(end) {
+			break
+		}
+		executionCount++
+		start = next
+	}
+
+	return executionCount <= x, nil
+}
+
+func generateWeeklyWeekendCron() string {
+	randDay := rand.Intn(2)
+	selectedDay := randDay * 6
+	return fmt.Sprintf("%d %d * * %d", rand.Intn(60), rand.Intn(24), selectedDay)
+}
+
+func generateBiWeeklyCron() string {
+	return fmt.Sprintf("%d %d %d,%d * *", rand.Intn(60), rand.Intn(24), rand.Intn(10)+5, rand.Intn(14)+15)
+}
+
+func generateMonthlyCron() string {
+	return fmt.Sprintf("%d %d %d * *", rand.Intn(60), rand.Intn(24), rand.Intn(28)+1)
+}
+
+func extractVersion(s string) string {
+	pattern := `^(release|openshift)-(\d+\.\d+)$`
+	re := regexp.MustCompile(pattern)
+
+	matches := re.FindStringSubmatch(s)
+
+	if len(matches) > 2 {
+		return matches[2]
+	}
+	return ""
+}

pkg/api/ocplifecycle/ocplifecycle.go

@@ -212,6 +212,10 @@ func (m MajorMinor) GetPastVersion() string {
 	return fmt.Sprintf("%d.%d", m.Major, m.Minor-1)
 }
 
+func (m MajorMinor) GetPastPastVersion() string {
+	return fmt.Sprintf("%d.%d", m.Major, m.Minor-1)
+}
+
 func (m MajorMinor) GetVersion() string {
 	return fmt.Sprintf("%d.%d", m.Major, m.Minor)
 }