[CLC-313]: Add Estimate Command to DMT

base/commands/migration/const.go

@@ -4,6 +4,7 @@ package migration
 
 const (
 	StartQueueName           = "__datamigration_start_queue"
+	EstimateQueueName        = "__datamigration_estimate_queue"
 	StatusMapName            = "__datamigration_migrations"
 	UpdateTopicPrefix        = "__datamigration_updates_"
 	DebugLogsListPrefix      = "__datamigration_debug_logs_"

base/commands/migration/estimate.go

@@ -0,0 +1,56 @@
+//go:build std || migration
+
+package migration
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/hazelcast/hazelcast-commandline-client/clc/paths"
+	"github.com/hazelcast/hazelcast-commandline-client/clc/ux/stage"
+	"github.com/hazelcast/hazelcast-commandline-client/internal/check"
+	"github.com/hazelcast/hazelcast-commandline-client/internal/plug"
+)
+
+type EstimateCmd struct{}
+
+func (e EstimateCmd) Init(cc plug.InitContext) error {
+	cc.SetCommandUsage("estimate")
+	cc.SetCommandGroup("migration")
+	help := "Estimate migration"
+	cc.SetCommandHelp(help, help)
+	cc.AddStringArg(argDMTConfig, argTitleDMTConfig)
+	return nil
+}
+
+func (e EstimateCmd) Exec(ctx context.Context, ec plug.ExecContext) error {
+	ec.PrintlnUnnecessary("")
+	ec.PrintlnUnnecessary(fmt.Sprintf(`%s
+
+Estimation usually ends within 15 seconds.`, banner))
+	conf := ec.GetStringArg(argDMTConfig)
+	if !paths.Exists(conf) {
+		return fmt.Errorf("migration config does not exist: %s", conf)
+	}
+	mID := MakeMigrationID()
+	stages, err := NewEstimateStages(ec.Logger(), mID, conf)
+	if err != nil {
+		return err
+	}
+	sp := stage.NewFixedProvider(stages.Build(ctx, ec)...)
+	res, err := stage.Execute(ctx, ec, any(nil), sp)
+	if err != nil {
+		return err
+	}
+	resArr := res.([]string)
+	ec.PrintlnUnnecessary("")
+	ec.PrintlnUnnecessary(resArr[0])
+	ec.PrintlnUnnecessary(resArr[1])
+	ec.PrintlnUnnecessary("")
+	ec.PrintlnUnnecessary("OK Estimation completed successfully.")
+	return nil
+}
+
+func init() {
+	check.Must(plug.Registry.RegisterCommand("estimate", &EstimateCmd{}))
+}

base/commands/migration/estimate_it_test.go

@@ -0,0 +1,56 @@
+//go:build std || migration
+
+package migration_test
+
+import (
+	"context"
+	"encoding/json"
+	"os"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/hazelcast/hazelcast-commandline-client/base/commands/migration"
+	"github.com/hazelcast/hazelcast-commandline-client/internal/check"
+	"github.com/hazelcast/hazelcast-commandline-client/internal/it"
+	"github.com/hazelcast/hazelcast-go-client/serialization"
+)
+
+func TestEstimate(t *testing.T) {
+	tcx := it.TestContext{T: t}
+	ctx := context.Background()
+	tcx.Tester(func(tcx it.TestContext) {
+		createMapping(ctx, tcx)
+		var wg sync.WaitGroup
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
+			check.Must(tcx.CLC().Execute(ctx, "estimate", "testdata/dmt_config"))
+		}()
+		c := make(chan string)
+		go findEstimationID(ctx, tcx, c)
+		mID := <-c
+		go estimateRunner(ctx, tcx, mID)
+		wg.Wait()
+		tcx.AssertStdoutContains("OK Estimation completed successfully")
+	})
+}
+
+func estimateRunner(ctx context.Context, tcx it.TestContext, migrationID string) {
+	statusMap := check.MustValue(tcx.Client.GetMap(ctx, migration.StatusMapName))
+	b := check.MustValue(os.ReadFile("testdata/estimate/estimate_completed.json"))
+	check.Must(statusMap.Set(ctx, migrationID, serialization.JSON(b)))
+}
+
+func findEstimationID(ctx context.Context, tcx it.TestContext, c chan string) {
+	q := check.MustValue(tcx.Client.GetQueue(ctx, migration.EstimateQueueName))
+	var b migration.ConfigBundle
+	for {
+		v := check.MustValue(q.PollWithTimeout(ctx, 100*time.Millisecond))
+		if v != nil {
+			check.Must(json.Unmarshal(v.(serialization.JSON), &b))
+			c <- b.MigrationID
+			break
+		}
+	}
+}

base/commands/migration/estimate_stages.go

@@ -0,0 +1,179 @@
+//go:build std || migration
+
+package migration
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strconv"
+	"time"
+
+	"github.com/hazelcast/hazelcast-commandline-client/clc/ux/stage"
+	"github.com/hazelcast/hazelcast-commandline-client/internal/log"
+	"github.com/hazelcast/hazelcast-commandline-client/internal/plug"
+	"github.com/hazelcast/hazelcast-go-client"
+	"github.com/hazelcast/hazelcast-go-client/serialization"
+)
+
+type EstimateStages struct {
+	migrationID   string
+	configDir     string
+	ci            *hazelcast.ClientInternal
+	estimateQueue *hazelcast.Queue
+	statusMap     *hazelcast.Map
+	logger        log.Logger
+}
+
+func NewEstimateStages(logger log.Logger, migrationID, configDir string) (*EstimateStages, error) {
+	if migrationID == "" {
+		return nil, errors.New("migrationID is required")
+	}
+	return &EstimateStages{
+		migrationID: migrationID,
+		configDir:   configDir,
+		logger:      logger,
+	}, nil
+}
+
+func (es *EstimateStages) Build(ctx context.Context, ec plug.ExecContext) []stage.Stage[any] {
+	return []stage.Stage[any]{
+		{
+			ProgressMsg: "Connecting to the migration cluster",
+			SuccessMsg:  "Connected to the migration cluster",
+			FailureMsg:  "Could not connect to the migration cluster",
+			Func:        es.connectStage(ec),
+		},
+		{
+			ProgressMsg: "Estimating the migration",
+			SuccessMsg:  "Estimated the migration",
+			FailureMsg:  "Could not estimate the migration",
+			Func:        es.estimateStage(),
+		},
+	}
+}
+
+func (es *EstimateStages) connectStage(ec plug.ExecContext) func(context.Context, stage.Statuser[any]) (any, error) {
+	return func(ctx context.Context, s stage.Statuser[any]) (any, error) {
+		var err error
+		es.ci, err = ec.ClientInternal(ctx)
+		if err != nil {
+			return nil, err
+		}
+		es.estimateQueue, err = es.ci.Client().GetQueue(ctx, EstimateQueueName)
+		if err != nil {
+			return nil, fmt.Errorf("retrieving the estimate Queue: %w", err)
+		}
+		es.statusMap, err = es.ci.Client().GetMap(ctx, StatusMapName)
+		if err != nil {
+			return nil, fmt.Errorf("retrieving the status Map: %w", err)
+		}
+		return nil, nil
+	}
+}
+
+func (es *EstimateStages) estimateStage() func(context.Context, stage.Statuser[any]) (any, error) {
+	return func(ctx context.Context, status stage.Statuser[any]) (any, error) {
+		cb, err := makeConfigBundle(es.configDir, es.migrationID)
+		if err != nil {
+			return nil, fmt.Errorf("making configuration bundle: %w", err)
+		}
+		if err = es.estimateQueue.Put(ctx, cb); err != nil {
+			return nil, fmt.Errorf("updating estimate Queue: %w", err)
+		}
+		childCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
+		defer cancel()
+		if err = waitForEstimationToComplete(childCtx, es.ci, es.migrationID, status); err != nil {
+			return nil, fmt.Errorf("waiting for estimation to complete: %w", err)
+		}
+		return fetchEstimationResults(ctx, es.ci, es.migrationID)
+	}
+}
+
+func waitForEstimationToComplete(ctx context.Context, ci *hazelcast.ClientInternal, migrationID string, stage stage.Statuser[any]) error {
+	duration := 16 * time.Second
+	interval := 1 * time.Second
+	for {
+		if duration > 0 {
+			stage.SetRemainingDuration(duration)
+		} else {
+			stage.SetText("Estimation took longer than expected.")
+		}
+		status, err := fetchMigrationStatus(ctx, ci, migrationID)
+		if err != nil {
+			if errors.Is(err, migrationStatusNotFoundErr) {
+				// migration status will not be available for a while, so we should wait for it
+				continue
+			}
+			return err
+		}
+		if Status(status) == StatusFailed {
+			errs, err := fetchMigrationErrors(ctx, ci, migrationID)
+			if err != nil {
+				return fmt.Errorf("estimation failed and dmt cannot fetch estimation errors: %w", err)
+			}
+			return errors.New(errs)
+		}
+		if Status(status) == StatusComplete {
+			return nil
+		}
+		time.Sleep(interval)
+		duration = duration - interval
+	}
+}
+
+func fetchEstimationResults(ctx context.Context, ci *hazelcast.ClientInternal, migrationID string) ([]string, error) {
+	q := fmt.Sprintf(`SELECT JSON_QUERY(this, '$.estimatedTime'), JSON_QUERY(this, '$.estimatedSize') FROM %s WHERE __key='%s'`, StatusMapName, migrationID)
+	res, err := ci.Client().SQL().Execute(ctx, q)
+	if err != nil {
+		return nil, err
+	}
+	it, err := res.Iterator()
+	if err != nil {
+		return nil, err
+	}
+	if it.HasNext() {
+		// single iteration is enough that we are reading single result for a single migration
+		row, err := it.Next()
+		if err != nil {
+			return nil, err
+		}
+		estimatedTime, err := row.Get(0)
+		if err != nil {
+			return nil, err
+		}
+		estimatedSize, err := row.Get(1)
+		if err != nil {
+			return nil, err
+		}
+		et, err := msToSecs(estimatedTime.(serialization.JSON).String())
+		if err != nil {
+			return nil, err
+		}
+		es, err := bytesToMegabytes(estimatedSize.(serialization.JSON).String())
+		if err != nil {
+			return nil, err
+		}
+		return []string{fmt.Sprintf("Estimated Size: %s ", es), fmt.Sprintf("Estimated Time: %s", et)}, nil
+	}
+	return nil, errors.New("no rows found")
+}
+
+func bytesToMegabytes(bytesStr string) (string, error) {
+	bytes, err := strconv.ParseFloat(bytesStr, 64)
+	if err != nil {
+		return "", err
+	}
+	mb := bytes / (1024.0 * 1024.0)
+	return fmt.Sprintf("%.2f MBs", mb), nil
+}
+
+func msToSecs(ms string) (string, error) {
+	milliseconds, err := strconv.ParseInt(ms, 10, 64)
+	if err != nil {
+		return "", err
+	}
+	seconds := float64(milliseconds) / 1000.0
+	secondsStr := fmt.Sprintf("%.1f sec", seconds)
+	return secondsStr, nil
+}

base/commands/migration/migration_start.go

@@ -4,8 +4,10 @@ package migration
 
 import (
 	"context"
+	"fmt"
 
 	"github.com/hazelcast/hazelcast-commandline-client/clc"
+	"github.com/hazelcast/hazelcast-commandline-client/clc/paths"
 	"github.com/hazelcast/hazelcast-commandline-client/clc/ux/stage"
 	clcerrors "github.com/hazelcast/hazelcast-commandline-client/errors"
 	"github.com/hazelcast/hazelcast-commandline-client/internal/check"
@@ -41,6 +43,10 @@ func (StartCmd) Exec(ctx context.Context, ec plug.ExecContext) (err error) {
 
 Selected data structures in the source cluster will be migrated to the target cluster.	
 `)
+	conf := ec.GetStringArg(argDMTConfig)
+	if !paths.Exists(conf) {
+		return fmt.Errorf("migration config does not exist: %s", conf)
+	}
 	if !ec.Props().GetBool(clc.FlagAutoYes) {
 		p := prompt.New(ec.Stdin(), ec.Stdout())
 		yes, err := p.YesNo("Proceed?")
@@ -59,7 +65,7 @@ Selected data structures in the source cluster will be migrated to the target cl
 			err = finalizeErr
 		}
 	}()
-	sts, err := NewStartStages(ec.Logger(), mID, ec.GetStringArg(argDMTConfig))
+	sts, err := NewStartStages(ec.Logger(), mID, conf)
 	if err != nil {
 		return err
 	}

base/commands/migration/start_stages.go

@@ -4,15 +4,13 @@ package migration
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
 
 	"github.com/hazelcast/hazelcast-commandline-client/clc/ux/stage"
 	"github.com/hazelcast/hazelcast-commandline-client/internal/log"
 	"github.com/hazelcast/hazelcast-commandline-client/internal/plug"
 	"github.com/hazelcast/hazelcast-go-client"
-	"github.com/hazelcast/hazelcast-go-client/serialization"
 )
 
 type StartStages struct {
@@ -83,16 +81,3 @@ func (st *StartStages) startStage() func(context.Context, stage.Statuser[any]) (
 		return nil, nil
 	}
 }
-
-func makeConfigBundle(configDir, migrationID string) (serialization.JSON, error) {
-	var cb ConfigBundle
-	cb.MigrationID = migrationID
-	if err := cb.Walk(configDir); err != nil {
-		return nil, err
-	}
-	b, err := json.Marshal(cb)
-	if err != nil {
-		return nil, err
-	}
-	return b, nil
-}

base/commands/migration/start_stages_it_test.go

@@ -67,7 +67,7 @@ func startMigrationTest(t *testing.T, expectedErr error, statusMapStateFiles []s
 		var execErr error
 		go tcx.WithReset(func() {
 			defer wg.Done()
-			execErr = tcx.CLC().Execute(ctx, "start", "dmt-config", "--yes", "-o", outDir)
+			execErr = tcx.CLC().Execute(ctx, "start", "testdata/dmt_config", "--yes", "-o", outDir)
 		})
 		c := make(chan string)
 		go findMigrationID(ctx, tcx, c)

base/commands/migration/testdata/estimate/estimate_completed.json

@@ -0,0 +1,5 @@
+{
+  "status": "COMPLETED",
+  "estimatedTime": 1,
+  "estimatedSize": 1
+}