Dialogflow ES から会話エージェント（Dialogflow CX）に移行する

// Package main implements the ES to CX migration tool.
package main

import (
	"context"
	"encoding/csv"
	"flag"
	"fmt"
	"os"
	"strings"
	"time"

	v2 "cloud.google.com/go/dialogflow/apiv2"
	proto2 "cloud.google.com/go/dialogflow/apiv2/dialogflowpb"
	v3 "cloud.google.com/go/dialogflow/cx/apiv3"
	proto3 "cloud.google.com/go/dialogflow/cx/apiv3/cxpb"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
)

// Commandline flags
var v2Project *string = flag.String("es-project-id", "", "ES project")
var v3Project *string = flag.String("cx-project-id", "", "CX project")
var v2Region *string = flag.String("es-region-id", "", "ES region")
var v3Region *string = flag.String("cx-region-id", "", "CX region")
var v3Agent *string = flag.String("cx-agent-id", "", "CX region")
var outFile *string = flag.String("out-file", "", "Output file for CSV TODO items")
var dryRun *bool = flag.Bool("dry-run", false, "Set true to skip CX agent writes")

// Map from entity type display name to fully qualified name.
var entityTypeShortToLong = map[string]string{}

// Map from ES system entity to CX system entity
var convertSystemEntity = map[string]string{
	"sys.address":         "sys.address",
	"sys.any":             "sys.any",
	"sys.cardinal":        "sys.cardinal",
	"sys.color":           "sys.color",
	"sys.currency-name":   "sys.currency-name",
	"sys.date":            "sys.date",
	"sys.date-period":     "sys.date-period",
	"sys.date-time":       "sys.date-time",
	"sys.duration":        "sys.duration",
	"sys.email":           "sys.email",
	"sys.flight-number":   "sys.flight-number",
	"sys.geo-city-gb":     "sys.geo-city",
	"sys.geo-city-us":     "sys.geo-city",
	"sys.geo-city":        "sys.geo-city",
	"sys.geo-country":     "sys.geo-country",
	"sys.geo-state":       "sys.geo-state",
	"sys.geo-state-us":    "sys.geo-state",
	"sys.geo-state-gb":    "sys.geo-state",
	"sys.given-name":      "sys.given-name",
	"sys.language":        "sys.language",
	"sys.last-name":       "sys.last-name",
	"sys.street-address":  "sys.location",
	"sys.location":        "sys.location",
	"sys.number":          "sys.number",
	"sys.number-integer":  "sys.number-integer",
	"sys.number-sequence": "sys.number-sequence",
	"sys.ordinal":         "sys.ordinal",
	"sys.percentage":      "sys.percentage",
	"sys.person":          "sys.person",
	"sys.phone-number":    "sys.phone-number",
	"sys.temperature":     "sys.temperature",
	"sys.time":            "sys.time",
	"sys.time-period":     "sys.time-period",
	"sys.unit-currency":   "sys.unit-currency",
	"sys.url":             "sys.url",
	"sys.zip-code":        "sys.zip-code",
}

// Issues found for the CSV output
var issues = [][]string{
	{"Field", "Issue"},
}

// logIssue logs an issue for the CSV output
func logIssue(field string, issue string) {
	issues = append(issues, []string{field, issue})
}

// convertEntityType converts an ES entity type to CX
func convertEntityType(et2 *proto2.EntityType) *proto3.EntityType {
	var kind3 proto3.EntityType_Kind
	switch kind2 := et2.Kind; kind2 {
	case proto2.EntityType_KIND_MAP:
		kind3 = proto3.EntityType_KIND_MAP
	case proto2.EntityType_KIND_LIST:
		kind3 = proto3.EntityType_KIND_LIST
	case proto2.EntityType_KIND_REGEXP:
		kind3 = proto3.EntityType_KIND_REGEXP
	default:
		kind3 = proto3.EntityType_KIND_UNSPECIFIED
	}
	var expansion3 proto3.EntityType_AutoExpansionMode
	switch expansion2 := et2.AutoExpansionMode; expansion2 {
	case proto2.EntityType_AUTO_EXPANSION_MODE_DEFAULT:
		expansion3 = proto3.EntityType_AUTO_EXPANSION_MODE_DEFAULT
	default:
		expansion3 = proto3.EntityType_AUTO_EXPANSION_MODE_UNSPECIFIED
	}
	et3 := &proto3.EntityType{
		DisplayName:           et2.DisplayName,
		Kind:                  kind3,
		AutoExpansionMode:     expansion3,
		EnableFuzzyExtraction: et2.EnableFuzzyExtraction,
	}
	for _, e2 := range et2.Entities {
		et3.Entities = append(et3.Entities, &proto3.EntityType_Entity{
			Value:    e2.Value,
			Synonyms: e2.Synonyms,
		})
	}
	return et3
}

// convertParameterEntityType converts a entity type found in parameters
func convertParameterEntityType(intent string, parameter string, t2 string) string {
	if len(t2) == 0 {
		return ""
	}
	t2 = t2[1:] // remove @
	if strings.HasPrefix(t2, "sys.") {
		if val, ok := convertSystemEntity[t2]; ok {
			t2 = val
		} else {
			t2 = "sys.any"
			logIssue("Intent<"+intent+">.Parameter<"+parameter+">",
				"This intent parameter uses a system entity not supported by CX English agents. See the migration guide for advice. System entity: "+t2)
		}
		return fmt.Sprintf("projects/-/locations/-/agents/-/entityTypes/%s", t2)
	}
	return entityTypeShortToLong[t2]
}

// convertIntent converts an ES intent to CX
func convertIntent(intent2 *proto2.Intent) *proto3.Intent {
	if intent2.DisplayName == "Default Fallback Intent" ||
		intent2.DisplayName == "Default Welcome Intent" {
		return nil
	}

	intent3 := &proto3.Intent{
		DisplayName: intent2.DisplayName,
	}

	// WebhookState
	if intent2.WebhookState != proto2.Intent_WEBHOOK_STATE_UNSPECIFIED {
		logIssue("Intent<"+intent2.DisplayName+">.WebhookState",
			"This intent has webhook enabled. You must configure this in your CX agent.")
	}

	// IsFallback
	if intent2.IsFallback {
		logIssue("Intent<"+intent2.DisplayName+">.IsFallback",
			"This intent is a fallback intent. CX does not support this. Use no-match events instead.")
	}

	// MlDisabled
	if intent2.MlDisabled {
		logIssue("Intent<"+intent2.DisplayName+">.MlDisabled",
			"This intent has ML disabled. CX does not support this.")
	}

	// LiveAgentHandoff
	if intent2.LiveAgentHandoff {
		logIssue("Intent<"+intent2.DisplayName+">.LiveAgentHandoff",
			"This intent uses live agent handoff. You must configure this in a fulfillment.")
	}

	// EndInteraction
	if intent2.EndInteraction {
		logIssue("Intent<"+intent2.DisplayName+">.EndInteraction",
			"This intent uses end interaction. CX does not support this.")
	}

	// InputContextNames
	if len(intent2.InputContextNames) > 0 {
		logIssue("Intent<"+intent2.DisplayName+">.InputContextNames",
			"This intent uses context. See the migration guide for alternatives.")
	}

	// Events
	if len(intent2.Events) > 0 {
		logIssue("Intent<"+intent2.DisplayName+">.Events",
			"This intent uses events. Use event handlers instead.")
	}

	// TrainingPhrases
	var trainingPhrases3 []*proto3.Intent_TrainingPhrase
	for _, tp2 := range intent2.TrainingPhrases {
		if tp2.Type == proto2.Intent_TrainingPhrase_TEMPLATE {
			logIssue("Intent<"+intent2.DisplayName+">.TrainingPhrases",
				"This intent has a training phrase that uses a template (@...) training phrase type. CX does not support this.")
		}
		var parts3 []*proto3.Intent_TrainingPhrase_Part
		for _, part2 := range tp2.Parts {
			parts3 = append(parts3, &proto3.Intent_TrainingPhrase_Part{
				Text:        part2.Text,
				ParameterId: part2.Alias,
			})
		}
		trainingPhrases3 = append(trainingPhrases3, &proto3.Intent_TrainingPhrase{
			Parts:       parts3,
			RepeatCount: 1,
		})
	}
	intent3.TrainingPhrases = trainingPhrases3

	// Action
	if len(intent2.Action) > 0 {
		logIssue("Intent<"+intent2.DisplayName+">.Action",
			"This intent sets the action field. Use a fulfillment webhook tag instead.")
	}

	// OutputContexts
	if len(intent2.OutputContexts) > 0 {
		logIssue("Intent<"+intent2.DisplayName+">.OutputContexts",
			"This intent uses context. See the migration guide for alternatives.")
	}

	// ResetContexts
	if intent2.ResetContexts {
		logIssue("Intent<"+intent2.DisplayName+">.ResetContexts",
			"This intent uses context. See the migration guide for alternatives.")
	}

	// Parameters
	var parameters3 []*proto3.Intent_Parameter
	for _, p2 := range intent2.Parameters {
		if len(p2.Value) > 0 && p2.Value != "$"+p2.DisplayName {
			logIssue("Intent<"+intent2.DisplayName+">.Parameters<"+p2.DisplayName+">.Value",
				"This field is not set to $parameter-name. This feature is not supported by CX. See: https://cloud.google.com/dialogflow/es/docs/intents-actions-parameters#valfield.")
		}
		if len(p2.DefaultValue) > 0 {
			logIssue("Intent<"+intent2.DisplayName+">.Parameters<"+p2.DisplayName+">.DefaultValue",
				"This intent parameter is using a default value. CX intent parameters do not support default values, but CX page form parameters do. This parameter should probably become a form parameter.")
		}
		if p2.Mandatory {
			logIssue("Intent<"+intent2.DisplayName+">.Parameters<"+p2.DisplayName+">.Mandatory",
				"This intent parameter is marked as mandatory. CX intent parameters do not support mandatory parameters, but CX page form parameters do. This parameter should probably become a form parameter.")
		}
		for _, prompt := range p2.Prompts {
			logIssue("Intent<"+intent2.DisplayName+">.Parameters<"+p2.DisplayName+">.Prompts",
				"This intent parameter has a prompt. Use page form parameter prompts instead. Prompt: "+prompt)
		}
		if len(p2.EntityTypeDisplayName) == 0 {
			p2.EntityTypeDisplayName = "@sys.any"
			logIssue("Intent<"+intent2.DisplayName+">.Parameters<"+p2.DisplayName+">.EntityTypeDisplayName",
				"This intent parameter does not have an entity type. CX requires an entity type for all parameters..")
		}
		parameters3 = append(parameters3, &proto3.Intent_Parameter{
			Id:         p2.DisplayName,
			EntityType: convertParameterEntityType(intent2.DisplayName, p2.DisplayName, p2.EntityTypeDisplayName),
			IsList:     p2.IsList,
		})
		//fmt.Printf("Converted parameter: %+v\n", parameters3[len(parameters3)-1])
	}
	intent3.Parameters = parameters3

	// Messages
	for _, message := range intent2.Messages {
		m, ok := message.Message.(*proto2.Intent_Message_Text_)
		if ok {
			for _, t := range m.Text.Text {
				warnings := ""
				if strings.Contains(t, "#") {
					warnings += " This message may contain a context parameter reference, but CX does not support this."
				}
				if strings.Contains(t, ".original") {
					warnings += " This message may contain a parameter reference suffix of '.original', But CX only supports this for intent parameters (not session parameters)."
				}
				if strings.Contains(t, ".recent") {
					warnings += " This message may contain a parameter reference suffix of '.recent', but CX does not support this."
				}
				if strings.Contains(t, ".partial") {
					warnings += " This message may contain a parameter reference suffix of '.partial', but CX does not support this."
				}
				logIssue("Intent<"+intent2.DisplayName+">.Messages",
					"This intent has a response message. Use fulfillment instead."+warnings+" Message: "+t)
			}
		} else {
			logIssue("Intent<"+intent2.DisplayName+">.Messages",
				"This intent has a non-text response message. See the rich response message information in the migration guide.")
		}
		if message.Platform != proto2.Intent_Message_PLATFORM_UNSPECIFIED {
			logIssue("Intent<"+intent2.DisplayName+">.Platform",
				"This intent has a message with a non-default platform. See the migration guide for advice.")
		}
	}

	return intent3
}

// migrateEntities migrates ES entities to your CX agent
func migrateEntities(ctx context.Context) error {
	var err error

	// Create ES client
	var client2 *v2.EntityTypesClient
	options2 := []option.ClientOption{}
	if len(*v2Region) > 0 {
		options2 = append(options2,
			option.WithEndpoint(*v2Region+"-dialogflow.googleapis.com:443"))
	}
	client2, err = v2.NewEntityTypesClient(ctx, options2...)
	if err != nil {
		return err
	}
	defer client2.Close()
	var parent2 string
	if len(*v2Region) == 0 {
		parent2 = fmt.Sprintf("projects/%s/agent", *v2Project)
	} else {
		parent2 = fmt.Sprintf("projects/%s/locations/%s/agent", *v2Project, *v2Region)
	}

	// Create CX client
	var client3 *v3.EntityTypesClient
	options3 := []option.ClientOption{}
	if len(*v3Region) > 0 {
		options3 = append(options3,
			option.WithEndpoint(*v3Region+"-dialogflow.googleapis.com:443"))
	}
	client3, err = v3.NewEntityTypesClient(ctx, options3...)
	if err != nil {
		return err
	}
	defer client3.Close()
	parent3 := fmt.Sprintf("projects/%s/locations/%s/agents/%s", *v3Project, *v3Region, *v3Agent)

	// Read each V2 entity type, convert, and write to V3
	request2 := &proto2.ListEntityTypesRequest{
		Parent: parent2,
	}
	it2 := client2.ListEntityTypes(ctx, request2)
	for {
		var et2 *proto2.EntityType
		et2, err = it2.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		fmt.Printf("Entity Type: %s\n", et2.DisplayName)

		if *dryRun {
			convertEntityType(et2)
			continue
		}

		request3 := &proto3.CreateEntityTypeRequest{
			Parent:     parent3,
			EntityType: convertEntityType(et2),
		}
		et3, err := client3.CreateEntityType(ctx, request3)
		entityTypeShortToLong[et3.DisplayName] = et3.Name
		if err != nil {
			return err
		}

		// ES and CX each have a quota limit of 60 design-time requests per minute
		time.Sleep(2 * time.Second)
	}
	return nil
}

// migrateIntents migrates intents to your CX agent
func migrateIntents(ctx context.Context) error {
	var err error

	// Create ES client
	var client2 *v2.IntentsClient
	options2 := []option.ClientOption{}
	if len(*v2Region) > 0 {
		options2 = append(options2,
			option.WithEndpoint(*v2Region+"-dialogflow.googleapis.com:443"))
	}
	client2, err = v2.NewIntentsClient(ctx, options2...)
	if err != nil {
		return err
	}
	defer client2.Close()
	var parent2 string
	if len(*v2Region) == 0 {
		parent2 = fmt.Sprintf("projects/%s/agent", *v2Project)
	} else {
		parent2 = fmt.Sprintf("projects/%s/locations/%s/agent", *v2Project, *v2Region)
	}

	// Create CX client
	var client3 *v3.IntentsClient
	options3 := []option.ClientOption{}
	if len(*v3Region) > 0 {
		options3 = append(options3,
			option.WithEndpoint(*v3Region+"-dialogflow.googleapis.com:443"))
	}
	client3, err = v3.NewIntentsClient(ctx, options3...)
	if err != nil {
		return err
	}
	defer client3.Close()
	parent3 := fmt.Sprintf("projects/%s/locations/%s/agents/%s", *v3Project, *v3Region, *v3Agent)

	// Read each V2 entity type, convert, and write to V3
	request2 := &proto2.ListIntentsRequest{
		Parent:     parent2,
		IntentView: proto2.IntentView_INTENT_VIEW_FULL,
	}
	it2 := client2.ListIntents(ctx, request2)
	for {
		var intent2 *proto2.Intent
		intent2, err = it2.Next()
		if err == iterator.Done {
			break
		}
		if err != nil {
			return err
		}
		fmt.Printf("Intent: %s\n", intent2.DisplayName)
		intent3 := convertIntent(intent2)
		if intent3 == nil {
			continue
		}

		if *dryRun {
			continue
		}

		request3 := &proto3.CreateIntentRequest{
			Parent: parent3,
			Intent: intent3,
		}
		_, err := client3.CreateIntent(ctx, request3)
		if err != nil {
			return err
		}

		// ES and CX each have a quota limit of 60 design-time requests per minute
		time.Sleep(2 * time.Second)
	}
	return nil
}

// checkFlags checks commandline flags
func checkFlags() error {
	flag.Parse()
	if len(*v2Project) == 0 {
		return fmt.Errorf("Need to supply es-project-id flag")
	}
	if len(*v3Project) == 0 {
		return fmt.Errorf("Need to supply cx-project-id flag")
	}
	if len(*v2Region) == 0 {
		fmt.Printf("No region supplied for ES, using default\n")
	}
	if len(*v3Region) == 0 {
		return fmt.Errorf("Need to supply cx-region-id flag")
	}
	if len(*v3Agent) == 0 {
		return fmt.Errorf("Need to supply cx-agent-id flag")
	}
	if len(*outFile) == 0 {
		return fmt.Errorf("Need to supply out-file flag")
	}
	return nil
}

// closeFile is used as a convenience for defer
func closeFile(f *os.File) {
	err := f.Close()
	if err != nil {
		fmt.Fprintf(os.Stderr, "ERROR closing CSV file: %v\n", err)
		os.Exit(1)
	}
}

func main() {
	if err := checkFlags(); err != nil {
		fmt.Fprintf(os.Stderr, "ERROR checking flags: %v\n", err)
		os.Exit(1)
	}
	ctx := context.Background()
	if err := migrateEntities(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "ERROR migrating entities: %v\n", err)
		os.Exit(1)
	}
	if err := migrateIntents(ctx); err != nil {
		fmt.Fprintf(os.Stderr, "ERROR migrating intents: %v\n", err)
		os.Exit(1)
	}
	csvFile, err := os.Create(*outFile)
	if err != nil {
		fmt.Fprintf(os.Stderr, "ERROR opening output file: %v", err)
		os.Exit(1)
	}
	defer closeFile(csvFile)
	csvWriter := csv.NewWriter(csvFile)
	if err := csvWriter.WriteAll(issues); err != nil {
		fmt.Fprintf(os.Stderr, "ERROR writing CSV output file: %v", err)
		os.Exit(1)
	}
	csvWriter.Flush()
}