Refactor time trigger command (#1376)

pkg/fission-cli/cmd/timetrigger/create.go

@@ -0,0 +1,143 @@
+/*
+Copyright 2019 The Fission Authors.
+
+Licensed 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 timetrigger
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/pkg/errors"
+	"github.com/robfig/cron"
+	uuid "github.com/satori/go.uuid"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	fv1 "github.com/fission/fission/pkg/apis/fission.io/v1"
+	"github.com/fission/fission/pkg/controller/client"
+	"github.com/fission/fission/pkg/fission-cli/cliwrapper/cli"
+	"github.com/fission/fission/pkg/fission-cli/cmd"
+	"github.com/fission/fission/pkg/fission-cli/cmd/spec"
+)
+
+type CreateSubCommand struct {
+	client  *client.Client
+	trigger *fv1.TimeTrigger
+}
+
+func Create(flags cli.Input) error {
+	opts := CreateSubCommand{
+		client: cmd.GetServer(flags),
+	}
+	return opts.do(flags)
+}
+
+func (opts *CreateSubCommand) do(flags cli.Input) error {
+	err := opts.complete(flags)
+	if err != nil {
+		return err
+	}
+	return opts.run(flags)
+}
+
+func (opts *CreateSubCommand) complete(flags cli.Input) error {
+	name := flags.String("name")
+	if len(name) == 0 {
+		name = uuid.NewV4().String()
+	}
+
+	fnName := flags.String("function")
+	if len(fnName) == 0 {
+		return errors.New("Need a function name to create a trigger, use --function")
+	}
+
+	fnNamespace := flags.String("fnNamespace")
+
+	cronSpec := flags.String("cron")
+	if len(cronSpec) == 0 {
+		return errors.New("Need a cron spec like '0 30 * * * *', '@every 1h30m', or '@hourly'; use --cron")
+	}
+
+	opts.trigger = &fv1.TimeTrigger{
+		Metadata: metav1.ObjectMeta{
+			Name:      name,
+			Namespace: fnNamespace,
+		},
+		Spec: fv1.TimeTriggerSpec{
+			Cron: cronSpec,
+			FunctionReference: fv1.FunctionReference{
+				Type: fv1.FunctionReferenceTypeFunctionName,
+				Name: fnName,
+			},
+		},
+	}
+
+	return nil
+}
+
+func (opts *CreateSubCommand) run(flags cli.Input) error {
+	// if we're writing a spec, don't call the API
+	if flags.Bool("spec") {
+		specFile := fmt.Sprintf("timetrigger-%v.yaml", opts.trigger.Metadata.Name)
+		err := spec.SpecSave(*opts.trigger, specFile)
+		if err != nil {
+			return errors.Wrap(err, "error creating time trigger spec")
+		}
+		return nil
+	}
+
+	_, err := opts.client.TimeTriggerCreate(opts.trigger)
+	if err != nil {
+		return errors.Wrap(err, "error creating Time trigger")
+	}
+
+	fmt.Printf("trigger '%v' created\n", opts.trigger.Metadata.Name)
+
+	t, err := getAPITimeInfo(opts.client)
+	if err != nil {
+		return err
+	}
+
+	err = getCronNextNActivationTime(opts.trigger.Spec.Cron, t, 1)
+	if err != nil {
+		return errors.Wrap(err, "error passing cron spec examination")
+	}
+
+	return nil
+}
+
+func getAPITimeInfo(client *client.Client) (time.Time, error) {
+	serverInfo, err := client.ServerInfo()
+	if err != nil {
+		return time.Time{}, errors.Errorf("Error syncing server time information: %v", err)
+	}
+	return serverInfo.ServerTime.CurrentTime, nil
+}
+
+func getCronNextNActivationTime(cronSpec string, serverTime time.Time, round int) error {
+	sched, err := cron.Parse(cronSpec)
+	if err != nil {
+		return err
+	}
+
+	fmt.Printf("Current Server Time: \t%v\n", serverTime.Format(time.RFC3339))
+
+	for i := 0; i < round; i++ {
+		serverTime = sched.Next(serverTime)
+		fmt.Printf("Next %v invocation: \t%v\n", i+1, serverTime.Format(time.RFC3339))
+	}
+
+	return nil
+}