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 +1,53 @@
+//go:build std || migration
+
+package migration
+
+import (
+	"context"
+	"fmt"
+
+	"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(`Hazelcast Data Migration Tool v5.3.0
+(c) 2023 Hazelcast, Inc.
+
+Estimation usually ends within 15 seconds.
+`)
+	mID := MakeMigrationID()
+	stages, err := NewEstimateStages(ec.Logger(), mID, ec.GetStringArg(argDMTConfig))
+	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(fmt.Sprintf("OK %s", resArr[0]))
+	ec.PrintlnUnnecessary(fmt.Sprintf("OK %s", 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 @@
+package migration

base/commands/migration/estimate_stages.go

@@ -0,0 +1,158 @@
+//go:build std || migration
+
+package migration
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"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-commandline-client/internal/str"
+	"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)
+		}
+		if err = waitForEstimationToComplete(ctx, 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("It will take a bit 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 := str.MsToSecs(estimatedTime.(serialization.JSON).String())
+		if err != nil {
+			return nil, err
+		}
+		es, err := str.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")
+}

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/utils.go

@@ -5,13 +5,15 @@ package migration
 import (
 	"bufio"
 	"encoding/base64"
+	"encoding/json"
 	"fmt"
 	"io/fs"
 	"os"
 	"path/filepath"
 	"sort"
 	"strings"
 
+	"github.com/hazelcast/hazelcast-go-client/serialization"
 	"github.com/hazelcast/hazelcast-go-client/types"
 
 	"github.com/hazelcast/hazelcast-commandline-client/clc/paths"
@@ -125,6 +127,15 @@ func MakeMigrationID() string {
 	return types.NewUUID().String()
 }
 
-func MakeUpdateTopicName(migrationID string) string {
-	return UpdateTopicPrefix + migrationID
+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
 }

internal/str/str.go

@@ -59,3 +59,22 @@ func Colorize(text string) string {
 	}
 	return text
 }
+
+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
+}