ekuiper-new/internal/server/rest.go

// Copyright 2021-2023 EMQ Technologies Co., Ltd.
//
// 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 server

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"os"
	"path/filepath"
	"reflect"
	"runtime"
	"strconv"
	"time"

	"github.com/gorilla/handlers"
	"github.com/gorilla/mux"
	"golang.org/x/text/cases"
	"golang.org/x/text/language"

	"github.com/lf-edge/ekuiper/internal/conf"
	"github.com/lf-edge/ekuiper/internal/meta"
	"github.com/lf-edge/ekuiper/internal/pkg/httpx"
	"github.com/lf-edge/ekuiper/internal/pkg/store"
	"github.com/lf-edge/ekuiper/internal/processor"
	"github.com/lf-edge/ekuiper/internal/server/middleware"
	"github.com/lf-edge/ekuiper/pkg/api"
	"github.com/lf-edge/ekuiper/pkg/ast"
	"github.com/lf-edge/ekuiper/pkg/cast"
	"github.com/lf-edge/ekuiper/pkg/errorx"
	"github.com/lf-edge/ekuiper/pkg/infra"
	"github.com/lf-edge/ekuiper/pkg/kv"
)

const (
	ContentType     = "Content-Type"
	ContentTypeJSON = "application/json"
)

var (
	uploadDir       string
	uploadsDb       kv.KeyValue
	uploadsStatusDb kv.KeyValue
)

type statementDescriptor struct {
	Sql string `json:"sql,omitempty"`
}

func decodeStatementDescriptor(reader io.ReadCloser) (statementDescriptor, error) {
	sd := statementDescriptor{}
	err := json.NewDecoder(reader).Decode(&sd)
	// Problems decoding
	if err != nil {
		return sd, fmt.Errorf("Error decoding the statement descriptor: %v", err)
	}
	return sd, nil
}

// Handle applies the specified error and error concept to the HTTP response writer
func handleError(w http.ResponseWriter, err error, prefix string, logger api.Logger) {
	message := prefix
	if message != "" {
		message += ": "
	}
	message += err.Error()
	logger.Error(message)
	var ec int
	switch e := err.(type) {
	case *errorx.Error:
		switch e.Code() {
		case errorx.NOT_FOUND:
			ec = http.StatusNotFound
		default:
			ec = http.StatusBadRequest
		}
	default:
		ec = http.StatusBadRequest
	}
	http.Error(w, message, ec)
}

func jsonResponse(i interface{}, w http.ResponseWriter, logger api.Logger) {
	w.Header().Add(ContentType, ContentTypeJSON)

	jsonByte, err := json.Marshal(i)
	if err != nil {
		handleError(w, err, "", logger)
	}
	w.Header().Add("Content-Length", strconv.Itoa(len(jsonByte)))

	_, err = w.Write(jsonByte)
	// Problems encoding
	if err != nil {
		handleError(w, err, "", logger)
	}
}

func jsonByteResponse(buffer bytes.Buffer, w http.ResponseWriter, logger api.Logger) {
	w.Header().Add(ContentType, ContentTypeJSON)

	w.Header().Add("Content-Length", strconv.Itoa(buffer.Len()))

	_, err := w.Write(buffer.Bytes())
	// Problems encoding
	if err != nil {
		handleError(w, err, "", logger)
	}
}

func createRestServer(ip string, port int, needToken bool) *http.Server {
	dataDir, err := conf.GetDataLoc()
	if err != nil {
		panic(err)
	}
	uploadDir = filepath.Join(dataDir, "uploads")
	uploadsDb, err = store.GetKV("uploads")
	if err != nil {
		panic(err)
	}
	uploadsStatusDb, err = store.GetKV("uploadsStatusDb")
	if err != nil {
		panic(err)
	}

	r := mux.NewRouter()
	r.HandleFunc("/", rootHandler).Methods(http.MethodGet, http.MethodPost)
	r.HandleFunc("/ping", pingHandler).Methods(http.MethodGet)
	r.HandleFunc("/streams", streamsHandler).Methods(http.MethodGet, http.MethodPost)
	r.HandleFunc("/streams/{name}", streamHandler).Methods(http.MethodGet, http.MethodDelete, http.MethodPut)
	r.HandleFunc("/streams/{name}/schema", streamSchemaHandler).Methods(http.MethodGet)
	r.HandleFunc("/tables", tablesHandler).Methods(http.MethodGet, http.MethodPost)
	r.HandleFunc("/tables/{name}", tableHandler).Methods(http.MethodGet, http.MethodDelete, http.MethodPut)
	r.HandleFunc("/tables/{name}/schema", tableSchemaHandler).Methods(http.MethodGet)
	r.HandleFunc("/rules", rulesHandler).Methods(http.MethodGet, http.MethodPost)
	r.HandleFunc("/rules/{name}", ruleHandler).Methods(http.MethodDelete, http.MethodGet, http.MethodPut)
	r.HandleFunc("/rules/{name}/status", getStatusRuleHandler).Methods(http.MethodGet)
	r.HandleFunc("/rules/{name}/start", startRuleHandler).Methods(http.MethodPost)
	r.HandleFunc("/rules/{name}/stop", stopRuleHandler).Methods(http.MethodPost)
	r.HandleFunc("/rules/{name}/restart", restartRuleHandler).Methods(http.MethodPost)
	r.HandleFunc("/rules/{name}/topo", getTopoRuleHandler).Methods(http.MethodGet)
	r.HandleFunc("/rules/validate", validateRuleHandler).Methods(http.MethodPost)
	r.HandleFunc("/ruleset/export", exportHandler).Methods(http.MethodPost)
	r.HandleFunc("/ruleset/import", importHandler).Methods(http.MethodPost)
	r.HandleFunc("/configs", configurationUpdateHandler).Methods(http.MethodPatch)
	r.HandleFunc("/config/uploads", fileUploadHandler).Methods(http.MethodPost, http.MethodGet)
	r.HandleFunc("/config/uploads/{name}", fileDeleteHandler).Methods(http.MethodDelete)
	r.HandleFunc("/data/export", configurationExportHandler).Methods(http.MethodGet, http.MethodPost)
	r.HandleFunc("/data/import", configurationImportHandler).Methods(http.MethodPost)
	r.HandleFunc("/data/import/status", configurationStatusHandler).Methods(http.MethodGet)
	// Register extended routes
	for k, v := range components {
		logger.Infof("register rest endpoint for component %s", k)
		v.rest(r)
	}

	if needToken {
		r.Use(middleware.Auth)
	}

	server := &http.Server{
		Addr: cast.JoinHostPortInt(ip, port),
		// Good practice to set timeouts to avoid Slowloris attacks.
		WriteTimeout: time.Second * 60 * 5,
		ReadTimeout:  time.Second * 60 * 5,
		IdleTimeout:  time.Second * 60,
		Handler:      handlers.CORS(handlers.AllowedHeaders([]string{"Accept", "Accept-Language", "Content-Type", "Content-Language", "Origin", "Authorization"}), handlers.AllowedMethods([]string{"POST", "GET", "PUT", "DELETE", "HEAD"}))(r),
	}
	server.SetKeepAlivesEnabled(false)
	return server
}

type fileContent struct {
	Name     string `json:"name"`
	Content  string `json:"content"`
	FilePath string `json:"file"`
}

func (f *fileContent) InstallScript() string {
	marshal, err := json.Marshal(f)
	if err != nil {
		return ""
	}
	return string(marshal)
}

func (f *fileContent) Validate() error {
	if f.Content == "" && f.FilePath == "" {
		return fmt.Errorf("invalid body: content or FilePath is required")
	}
	if f.Name == "" {
		return fmt.Errorf("invalid body: name is required")
	}
	return nil
}

func upload(file *fileContent) error {
	err := getFile(file)
	if err != nil {
		_ = uploadsStatusDb.Set(file.Name, err.Error())
		return err
	}

	return uploadsDb.Set(file.Name, file.InstallScript())
}

func getFile(file *fileContent) error {
	filePath := filepath.Join(uploadDir, file.Name)
	dst, err := os.Create(filePath)
	if err != nil {
		return err
	}
	defer dst.Close()

	if file.FilePath != "" {
		err := httpx.DownloadFile(filePath, file.FilePath)
		if err != nil {
			return err
		}
	} else {
		_, err := dst.Write([]byte(file.Content))
		if err != nil {
			return err
		}
	}
	return nil
}

func fileUploadHandler(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	// Upload or overwrite a file
	case http.MethodPost:
		switch r.Header.Get("Content-Type") {
		case "application/json":
			fc := &fileContent{}
			defer r.Body.Close()
			err := json.NewDecoder(r.Body).Decode(fc)
			if err != nil {
				handleError(w, err, "Invalid body: Error decoding file json", logger)
				return
			}
			err = fc.Validate()
			if err != nil {
				handleError(w, err, "Invalid body: missing necessary field", logger)
				return
			}

			filePath := filepath.Join(uploadDir, fc.Name)
			err = upload(fc)
			if err != nil {
				handleError(w, err, "Upload error: getFile has error", logger)
				return
			}
			w.WriteHeader(http.StatusCreated)
			w.Write([]byte(filePath))
		default:
			// Maximum upload of 1 GB files
			err := r.ParseMultipartForm(1024 << 20)
			if err != nil {
				handleError(w, err, "Error parse the multi part form", logger)
				return
			}

			// Get handler for filename, size and headers
			file, handler, err := r.FormFile("uploadFile")
			if err != nil {
				handleError(w, err, "Error Retrieving the File", logger)
				return
			}

			defer file.Close()

			// Create file
			filePath := filepath.Join(uploadDir, handler.Filename)
			dst, err := os.Create(filePath)
			defer dst.Close()
			if err != nil {
				handleError(w, err, "Error creating the file", logger)
				return
			}

			// Copy the uploaded file to the created file on the filesystem
			if _, err := io.Copy(dst, file); err != nil {
				handleError(w, err, "Error writing the file", logger)
				return
			}

			w.WriteHeader(http.StatusCreated)
			w.Write([]byte(filePath))
		}

	case http.MethodGet:
		// Get the list of files in the upload directory
		files, err := os.ReadDir(uploadDir)
		if err != nil {
			handleError(w, err, "Error reading the file upload dir", logger)
			return
		}
		fileNames := make([]string, len(files))
		for i, f := range files {
			fileNames[i] = filepath.Join(uploadDir, f.Name())
		}
		jsonResponse(fileNames, w, logger)
	}
}

func fileDeleteHandler(w http.ResponseWriter, r *http.Request) {
	vars := mux.Vars(r)
	name := vars["name"]
	filePath := filepath.Join(uploadDir, name)
	e := os.Remove(filePath)
	if e != nil {
		handleError(w, e, "Error deleting the file", logger)
		return
	}
	_ = uploadsDb.Delete(name)
	_ = uploadsStatusDb.Delete(name)
	w.WriteHeader(http.StatusOK)
	w.Write([]byte("ok"))
}

type information struct {
	Version       string `json:"version"`
	Os            string `json:"os"`
	Arch          string `json:"arch"`
	UpTimeSeconds int64  `json:"upTimeSeconds"`
}

// The handler for root
func rootHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	switch r.Method {
	case http.MethodGet, http.MethodPost:
		w.WriteHeader(http.StatusOK)
		info := new(information)
		info.Version = version
		info.UpTimeSeconds = time.Now().Unix() - startTimeStamp
		info.Os = runtime.GOOS
		info.Arch = runtime.GOARCH
		byteInfo, _ := json.Marshal(info)
		w.Write(byteInfo)
	}
}

func pingHandler(w http.ResponseWriter, _ *http.Request) {
	w.WriteHeader(http.StatusOK)
}

func sourcesManageHandler(w http.ResponseWriter, r *http.Request, st ast.StreamType) {
	defer r.Body.Close()
	switch r.Method {
	case http.MethodGet:
		var (
			content []string
			err     error
			kind    string
		)
		if st == ast.TypeTable {
			kind = r.URL.Query().Get("kind")
			if kind == "scan" {
				kind = ast.StreamKindScan
			} else if kind == "lookup" {
				kind = ast.StreamKindLookup
			} else {
				kind = ""
			}
		}
		if kind != "" {
			content, err = streamProcessor.ShowTable(kind)
		} else {
			content, err = streamProcessor.ShowStream(st)
		}
		if err != nil {
			handleError(w, err, fmt.Sprintf("%s command error", cases.Title(language.Und).String(ast.StreamTypeMap[st])), logger)
			return
		}
		jsonResponse(content, w, logger)
	case http.MethodPost:
		v, err := decodeStatementDescriptor(r.Body)
		if err != nil {
			handleError(w, err, "Invalid body", logger)
			return
		}
		content, err := streamProcessor.ExecStreamSql(v.Sql)
		if err != nil {
			handleError(w, err, fmt.Sprintf("%s command error", cases.Title(language.Und).String(ast.StreamTypeMap[st])), logger)
			return
		}
		w.WriteHeader(http.StatusCreated)
		w.Write([]byte(content))
	}
}

func sourceManageHandler(w http.ResponseWriter, r *http.Request, st ast.StreamType) {
	defer r.Body.Close()
	vars := mux.Vars(r)
	name := vars["name"]

	switch r.Method {
	case http.MethodGet:
		content, err := streamProcessor.DescStream(name, st)
		if err != nil {
			handleError(w, err, fmt.Sprintf("describe %s error", ast.StreamTypeMap[st]), logger)
			return
		}
		jsonResponse(content, w, logger)
	case http.MethodDelete:
		content, err := streamProcessor.DropStream(name, st)
		if err != nil {
			handleError(w, err, fmt.Sprintf("delete %s error", ast.StreamTypeMap[st]), logger)
			return
		}
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(content))
	case http.MethodPut:
		v, err := decodeStatementDescriptor(r.Body)
		if err != nil {
			handleError(w, err, "Invalid body", logger)
			return
		}
		content, err := streamProcessor.ExecReplaceStream(name, v.Sql, st)
		if err != nil {
			handleError(w, err, fmt.Sprintf("%s command error", cases.Title(language.Und).String(ast.StreamTypeMap[st])), logger)
			return
		}
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(content))
	}
}

// list or create streams
func streamsHandler(w http.ResponseWriter, r *http.Request) {
	sourcesManageHandler(w, r, ast.TypeStream)
}

// describe or delete a stream
func streamHandler(w http.ResponseWriter, r *http.Request) {
	sourceManageHandler(w, r, ast.TypeStream)
}

// list or create tables
func tablesHandler(w http.ResponseWriter, r *http.Request) {
	sourcesManageHandler(w, r, ast.TypeTable)
}

func tableHandler(w http.ResponseWriter, r *http.Request) {
	sourceManageHandler(w, r, ast.TypeTable)
}

func streamSchemaHandler(w http.ResponseWriter, r *http.Request) {
	sourceSchemaHandler(w, r, ast.TypeStream)
}

func tableSchemaHandler(w http.ResponseWriter, r *http.Request) {
	sourceSchemaHandler(w, r, ast.TypeTable)
}

func sourceSchemaHandler(w http.ResponseWriter, r *http.Request, st ast.StreamType) {
	vars := mux.Vars(r)
	name := vars["name"]
	content, err := streamProcessor.GetInferredJsonSchema(name, st)
	if err != nil {
		handleError(w, err, fmt.Sprintf("get schema of %s error", ast.StreamTypeMap[st]), logger)
		return
	}
	jsonResponse(content, w, logger)
}

// list or create rules
func rulesHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	switch r.Method {
	case http.MethodPost:
		body, err := io.ReadAll(r.Body)
		if err != nil {
			handleError(w, err, "Invalid body", logger)
			return
		}
		id, err := createRule("", string(body))
		if err != nil {
			handleError(w, err, "", logger)
			return
		}
		w.WriteHeader(http.StatusCreated)
		fmt.Fprintf(w, "Rule %s was created successfully.", id)
	case http.MethodGet:
		content, err := getAllRulesWithStatus()
		if err != nil {
			handleError(w, err, "Show rules error", logger)
			return
		}
		jsonResponse(content, w, logger)
	}
}

// describe or delete a rule
func ruleHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	vars := mux.Vars(r)
	name := vars["name"]

	switch r.Method {
	case http.MethodGet:
		rule, err := ruleProcessor.GetRuleJson(name)
		if err != nil {
			handleError(w, err, "Describe rule error", logger)
			return
		}
		w.Header().Add(ContentType, ContentTypeJSON)
		w.Write([]byte(rule))
	case http.MethodDelete:
		deleteRule(name)
		content, err := ruleProcessor.ExecDrop(name)
		if err != nil {
			handleError(w, err, "Delete rule error", logger)
			return
		}
		w.WriteHeader(http.StatusOK)
		w.Write([]byte(content))
	case http.MethodPut:
		_, err := ruleProcessor.GetRuleById(name)
		if err != nil {
			handleError(w, err, "Rule not found", logger)
			return
		}

		body, err := io.ReadAll(r.Body)
		if err != nil {
			handleError(w, err, "Invalid body", logger)
			return
		}
		err = updateRule(name, string(body))
		if err != nil {
			handleError(w, err, "Update rule error", logger)
			return
		}
		// Update to db after validation
		_, err = ruleProcessor.ExecUpdate(name, string(body))
		if err != nil {
			handleError(w, err, "Update rule error, suggest to delete it and recreate", logger)
			return
		}
		w.WriteHeader(http.StatusOK)
		fmt.Fprintf(w, "Rule %s was updated successfully.", name)
	}
}

// get status of a rule
func getStatusRuleHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	vars := mux.Vars(r)
	name := vars["name"]

	content, err := getRuleStatus(name)
	if err != nil {
		handleError(w, err, "get rule status error", logger)
		return
	}
	w.Header().Set(ContentType, ContentTypeJSON)
	w.WriteHeader(http.StatusOK)
	w.Write([]byte(content))
}

// start a rule
func startRuleHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	vars := mux.Vars(r)
	name := vars["name"]

	err := startRule(name)
	if err != nil {
		handleError(w, err, "start rule error", logger)
		return
	}
	w.WriteHeader(http.StatusOK)
	fmt.Fprintf(w, "Rule %s was started", name)
}

// stop a rule
func stopRuleHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	vars := mux.Vars(r)
	name := vars["name"]

	result := stopRule(name)
	w.WriteHeader(http.StatusOK)
	w.Write([]byte(result))
}

// restart a rule
func restartRuleHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	vars := mux.Vars(r)
	name := vars["name"]

	err := restartRule(name)
	if err != nil {
		handleError(w, err, "restart rule error", logger)
		return
	}
	w.WriteHeader(http.StatusOK)
	fmt.Fprintf(w, "Rule %s was restarted", name)
}

// get topo of a rule
func getTopoRuleHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	vars := mux.Vars(r)
	name := vars["name"]

	content, err := getRuleTopo(name)
	if err != nil {
		handleError(w, err, "get rule topo error", logger)
		return
	}
	w.Header().Set(ContentType, ContentTypeJSON)
	w.Write([]byte(content))
}

// validate a rule
func validateRuleHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	body, err := io.ReadAll(r.Body)
	if err != nil {
		handleError(w, err, "Invalid body", logger)
		return
	}
	validate, err := validateRule("", string(body))
	if !validate {
		w.WriteHeader(http.StatusUnprocessableEntity)
		w.Write([]byte(err.Error()))
		return
	}
	w.WriteHeader(http.StatusOK)
	w.Write([]byte("The rule has been successfully validated and is confirmed to be correct."))
}

type rulesetInfo struct {
	Content  string `json:"content"`
	FilePath string `json:"file"`
}

func importHandler(w http.ResponseWriter, r *http.Request) {
	rsi := &rulesetInfo{}
	err := json.NewDecoder(r.Body).Decode(rsi)
	if err != nil {
		handleError(w, err, "Invalid body: Error decoding json", logger)
		return
	}
	if rsi.Content != "" && rsi.FilePath != "" {
		handleError(w, errors.New("bad request"), "Invalid body: Cannot specify both content and file", logger)
		return
	} else if rsi.Content == "" && rsi.FilePath == "" {
		handleError(w, errors.New("bad request"), "Invalid body: must specify content or file", logger)
		return
	}
	content := []byte(rsi.Content)
	if rsi.FilePath != "" {
		reader, err := httpx.ReadFile(rsi.FilePath)
		if err != nil {
			handleError(w, err, "Fail to read file", logger)
			return
		}
		defer reader.Close()
		buf := new(bytes.Buffer)
		_, err = io.Copy(buf, reader)
		if err != nil {
			handleError(w, err, "fail to convert file", logger)
			return
		}
		content = buf.Bytes()
	}
	rules, counts, err := rulesetProcessor.Import(content)
	if err != nil {
		handleError(w, nil, "Import ruleset error", logger)
		return
	}
	infra.SafeRun(func() error {
		for _, name := range rules {
			rul, ee := ruleProcessor.GetRuleById(name)
			if ee != nil {
				logger.Error(ee)
				continue
			}
			reply := recoverRule(rul)
			if reply != "" {
				logger.Error(reply)
			}
		}
		return nil
	})
	fmt.Fprintf(w, "imported %d streams, %d tables and %d rules", counts[0], counts[1], counts[2])
}

func exportHandler(w http.ResponseWriter, r *http.Request) {
	const name = "ekuiper_export.json"
	exported, _, err := rulesetProcessor.Export()
	if err != nil {
		handleError(w, err, "export error", logger)
		return
	}
	w.Header().Set("Content-Type", "application/octet-stream")
	w.Header().Add("Content-Disposition", "Attachment")
	http.ServeContent(w, r, name, time.Now(), exported)
}

type Configuration struct {
	Streams          map[string]string `json:"streams"`
	Tables           map[string]string `json:"tables"`
	Rules            map[string]string `json:"rules"`
	NativePlugins    map[string]string `json:"nativePlugins"`
	PortablePlugins  map[string]string `json:"portablePlugins"`
	SourceConfig     map[string]string `json:"sourceConfig"`
	SinkConfig       map[string]string `json:"sinkConfig"`
	ConnectionConfig map[string]string `json:"connectionConfig"`
	Service          map[string]string `json:"Service"`
	Schema           map[string]string `json:"Schema"`
	Uploads          map[string]string `json:"uploads"`
}

func configurationExport() ([]byte, error) {
	conf := &Configuration{
		Streams:          make(map[string]string),
		Tables:           make(map[string]string),
		Rules:            make(map[string]string),
		NativePlugins:    make(map[string]string),
		PortablePlugins:  make(map[string]string),
		SourceConfig:     make(map[string]string),
		SinkConfig:       make(map[string]string),
		ConnectionConfig: make(map[string]string),
		Service:          make(map[string]string),
		Schema:           make(map[string]string),
		Uploads:          make(map[string]string),
	}
	ruleSet := rulesetProcessor.ExportRuleSet()
	if ruleSet != nil {
		conf.Streams = ruleSet.Streams
		conf.Tables = ruleSet.Tables
		conf.Rules = ruleSet.Rules
	}

	conf.NativePlugins = pluginExport()
	conf.PortablePlugins = portablePluginExport()
	conf.Service = serviceExport()
	conf.Schema = schemaExport()
	conf.Uploads = uploadsExport()

	yamlCfg := meta.GetConfigurations()
	conf.SourceConfig = yamlCfg.Sources
	conf.SinkConfig = yamlCfg.Sinks
	conf.ConnectionConfig = yamlCfg.Connections

	return json.Marshal(conf)
}

func configurationExportHandler(w http.ResponseWriter, r *http.Request) {
	var jsonBytes []byte
	const name = "ekuiper_export.json"

	switch r.Method {
	case http.MethodGet:
		jsonBytes, _ = configurationExport()
	case http.MethodPost:
		var rules []string
		_ = json.NewDecoder(r.Body).Decode(&rules)
		jsonBytes, _ = ruleMigrationProcessor.ConfigurationPartialExport(rules)
	}
	w.Header().Set("Content-Type", "application/octet-stream")
	w.Header().Add("Content-Disposition", "Attachment")
	http.ServeContent(w, r, name, time.Now(), bytes.NewReader(jsonBytes))
}

func configurationReset() {
	_ = resetAllRules()
	_ = resetAllStreams()
	pluginReset()
	portablePluginsReset()
	serviceReset()
	schemaReset()
	meta.ResetConfigs()
	uploadsReset()
}

type ImportConfigurationStatus struct {
	ErrorMsg       string
	ConfigResponse Configuration
}

func configurationImport(data []byte, reboot bool) ImportConfigurationStatus {
	conf := &Configuration{
		Streams:          make(map[string]string),
		Tables:           make(map[string]string),
		Rules:            make(map[string]string),
		NativePlugins:    make(map[string]string),
		PortablePlugins:  make(map[string]string),
		SourceConfig:     make(map[string]string),
		SinkConfig:       make(map[string]string),
		ConnectionConfig: make(map[string]string),
		Service:          make(map[string]string),
		Schema:           make(map[string]string),
		Uploads:          make(map[string]string),
	}

	importStatus := ImportConfigurationStatus{}

	configResponse := Configuration{
		Streams:          make(map[string]string),
		Tables:           make(map[string]string),
		Rules:            make(map[string]string),
		NativePlugins:    make(map[string]string),
		PortablePlugins:  make(map[string]string),
		SourceConfig:     make(map[string]string),
		SinkConfig:       make(map[string]string),
		ConnectionConfig: make(map[string]string),
		Service:          make(map[string]string),
		Schema:           make(map[string]string),
		Uploads:          make(map[string]string),
	}

	ResponseNil := Configuration{
		Streams:          make(map[string]string),
		Tables:           make(map[string]string),
		Rules:            make(map[string]string),
		NativePlugins:    make(map[string]string),
		PortablePlugins:  make(map[string]string),
		SourceConfig:     make(map[string]string),
		SinkConfig:       make(map[string]string),
		ConnectionConfig: make(map[string]string),
		Service:          make(map[string]string),
		Schema:           make(map[string]string),
		Uploads:          make(map[string]string),
	}

	err := json.Unmarshal(data, conf)
	if err != nil {
		importStatus.ErrorMsg = fmt.Errorf("configuration unmarshal with error %v", err).Error()
		return importStatus
	}
	configResponse.Uploads = uploadsImport(conf.Uploads)

	if reboot {
		err = pluginImport(conf.NativePlugins)
		if err != nil {
			importStatus.ErrorMsg = fmt.Errorf("pluginImport NativePlugins import error %v", err).Error()
			return importStatus
		}
		err = schemaImport(conf.Schema)
		if err != nil {
			importStatus.ErrorMsg = fmt.Errorf("schemaImport Schema import error %v", err).Error()
			return importStatus
		}
	}

	configResponse.PortablePlugins = portablePluginImport(conf.PortablePlugins)
	configResponse.Service = serviceImport(conf.Service)

	yamlCfgSet := meta.YamlConfigurationSet{
		Sources:     conf.SourceConfig,
		Sinks:       conf.SinkConfig,
		Connections: conf.ConnectionConfig,
	}

	confRsp := meta.LoadConfigurations(yamlCfgSet)
	configResponse.SourceConfig = confRsp.Sources
	configResponse.SinkConfig = confRsp.Sinks
	configResponse.ConnectionConfig = confRsp.Connections

	ruleSet := processor.Ruleset{
		Streams: conf.Streams,
		Tables:  conf.Tables,
		Rules:   conf.Rules,
	}

	result := rulesetProcessor.ImportRuleSet(ruleSet)
	configResponse.Streams = result.Streams
	configResponse.Tables = result.Tables
	configResponse.Rules = result.Rules

	if !reboot {
		infra.SafeRun(func() error {
			for name := range ruleSet.Rules {
				rul, ee := ruleProcessor.GetRuleById(name)
				if ee != nil {
					logger.Error(ee)
					continue
				}
				reply := recoverRule(rul)
				if reply != "" {
					logger.Error(reply)
				}
			}
			return nil
		})
	}

	if reflect.DeepEqual(ResponseNil, configResponse) {
		importStatus.ConfigResponse = ResponseNil
	} else {
		importStatus.ErrorMsg = "process error"
		importStatus.ConfigResponse = configResponse
	}

	return importStatus
}

func configurationPartialImport(data []byte) ImportConfigurationStatus {
	conf := &Configuration{
		Streams:          make(map[string]string),
		Tables:           make(map[string]string),
		Rules:            make(map[string]string),
		NativePlugins:    make(map[string]string),
		PortablePlugins:  make(map[string]string),
		SourceConfig:     make(map[string]string),
		SinkConfig:       make(map[string]string),
		ConnectionConfig: make(map[string]string),
		Service:          make(map[string]string),
		Schema:           make(map[string]string),
		Uploads:          make(map[string]string),
	}

	importStatus := ImportConfigurationStatus{}

	configResponse := Configuration{
		Streams:          make(map[string]string),
		Tables:           make(map[string]string),
		Rules:            make(map[string]string),
		NativePlugins:    make(map[string]string),
		PortablePlugins:  make(map[string]string),
		SourceConfig:     make(map[string]string),
		SinkConfig:       make(map[string]string),
		ConnectionConfig: make(map[string]string),
		Service:          make(map[string]string),
		Schema:           make(map[string]string),
		Uploads:          make(map[string]string),
	}

	ResponseNil := Configuration{
		Streams:          make(map[string]string),
		Tables:           make(map[string]string),
		Rules:            make(map[string]string),
		NativePlugins:    make(map[string]string),
		PortablePlugins:  make(map[string]string),
		SourceConfig:     make(map[string]string),
		SinkConfig:       make(map[string]string),
		ConnectionConfig: make(map[string]string),
		Service:          make(map[string]string),
		Schema:           make(map[string]string),
		Uploads:          make(map[string]string),
	}

	err := json.Unmarshal(data, conf)
	if err != nil {
		importStatus.ErrorMsg = fmt.Errorf("configuration unmarshal with error %v", err).Error()
		return importStatus
	}

	yamlCfgSet := meta.YamlConfigurationSet{
		Sources:     conf.SourceConfig,
		Sinks:       conf.SinkConfig,
		Connections: conf.ConnectionConfig,
	}

	confRsp := meta.LoadConfigurationsPartial(yamlCfgSet)

	configResponse.Uploads = uploadsImport(conf.Uploads)
	configResponse.NativePlugins = pluginPartialImport(conf.NativePlugins)
	configResponse.Schema = schemaPartialImport(conf.Schema)
	configResponse.PortablePlugins = portablePluginPartialImport(conf.PortablePlugins)
	configResponse.Service = servicePartialImport(conf.Service)
	configResponse.SourceConfig = confRsp.Sources
	configResponse.SinkConfig = confRsp.Sinks
	configResponse.ConnectionConfig = confRsp.Connections

	ruleSet := processor.Ruleset{
		Streams: conf.Streams,
		Tables:  conf.Tables,
		Rules:   conf.Rules,
	}

	result := importRuleSetPartial(ruleSet)
	configResponse.Streams = result.Streams
	configResponse.Tables = result.Tables
	configResponse.Rules = result.Rules

	if reflect.DeepEqual(ResponseNil, configResponse) {
		importStatus.ConfigResponse = ResponseNil
	} else {
		importStatus.ErrorMsg = "process error"
		importStatus.ConfigResponse = configResponse
	}

	return importStatus
}

type configurationInfo struct {
	Content  string `json:"content"`
	FilePath string `json:"file"`
}

func configurationImportHandler(w http.ResponseWriter, r *http.Request) {
	cb := r.URL.Query().Get("stop")
	stop := cb == "1"
	par := r.URL.Query().Get("partial")
	partial := par == "1"
	rsi := &configurationInfo{}
	err := json.NewDecoder(r.Body).Decode(rsi)
	if err != nil {
		handleError(w, err, "Invalid body: Error decoding json", logger)
		return
	}
	if rsi.Content != "" && rsi.FilePath != "" {
		handleError(w, errors.New("bad request"), "Invalid body: Cannot specify both content and file", logger)
		return
	} else if rsi.Content == "" && rsi.FilePath == "" {
		handleError(w, errors.New("bad request"), "Invalid body: must specify content or file", logger)
		return
	}
	content := []byte(rsi.Content)
	if rsi.FilePath != "" {
		reader, err := httpx.ReadFile(rsi.FilePath)
		if err != nil {
			handleError(w, err, "Fail to read file", logger)
			return
		}
		defer reader.Close()
		buf := new(bytes.Buffer)
		_, err = io.Copy(buf, reader)
		if err != nil {
			handleError(w, err, "fail to convert file", logger)
			return
		}
		content = buf.Bytes()
	}
	if !partial {
		configurationReset()
		result := configurationImport(content, stop)
		if result.ErrorMsg != "" {
			w.WriteHeader(http.StatusBadRequest)
			jsonResponse(result, w, logger)
		} else {
			w.WriteHeader(http.StatusOK)
			jsonResponse(result, w, logger)
		}

		if stop {
			go func() {
				time.Sleep(1 * time.Second)
				os.Exit(100)
			}()
		}
	} else {
		result := configurationPartialImport(content)
		if result.ErrorMsg != "" {
			w.WriteHeader(http.StatusBadRequest)
			jsonResponse(result, w, logger)
		} else {
			w.WriteHeader(http.StatusOK)
			jsonResponse(result, w, logger)
		}
	}
}

func configurationStatusExport() Configuration {
	conf := Configuration{
		Streams:          make(map[string]string),
		Tables:           make(map[string]string),
		Rules:            make(map[string]string),
		NativePlugins:    make(map[string]string),
		PortablePlugins:  make(map[string]string),
		SourceConfig:     make(map[string]string),
		SinkConfig:       make(map[string]string),
		ConnectionConfig: make(map[string]string),
		Service:          make(map[string]string),
		Schema:           make(map[string]string),
		Uploads:          make(map[string]string),
	}
	ruleSet := rulesetProcessor.ExportRuleSetStatus()
	if ruleSet != nil {
		conf.Streams = ruleSet.Streams
		conf.Tables = ruleSet.Tables
		conf.Rules = ruleSet.Rules
	}

	conf.NativePlugins = pluginStatusExport()
	conf.PortablePlugins = portablePluginStatusExport()
	conf.Service = serviceStatusExport()
	conf.Schema = schemaStatusExport()
	conf.Uploads = uploadsStatusExport()

	yamlCfgStatus := meta.GetConfigurationStatus()
	conf.SourceConfig = yamlCfgStatus.Sources
	conf.SinkConfig = yamlCfgStatus.Sinks
	conf.ConnectionConfig = yamlCfgStatus.Connections

	return conf
}

func configurationUpdateHandler(w http.ResponseWriter, r *http.Request) {
	basic := struct {
		Debug      *bool   `json:"debug"`
		ConsoleLog *bool   `json:"consoleLog"`
		FileLog    *bool   `json:"fileLog"`
		TimeZone   *string `json:"timezone"`
	}{}
	if err := json.NewDecoder(r.Body).Decode(&basic); err != nil {
		w.WriteHeader(http.StatusBadRequest)
		handleError(w, err, "Invalid JSON", logger)
		return
	}

	if basic.Debug != nil {
		conf.SetDebugLevel(*basic.Debug)
		conf.Config.Basic.Debug = *basic.Debug
	}

	if basic.TimeZone != nil {
		if err := cast.SetTimeZone(*basic.TimeZone); err != nil {
			w.WriteHeader(http.StatusBadRequest)
			handleError(w, err, "Invalid TZ", logger)
			return
		}
		conf.Config.Basic.TimeZone = *basic.TimeZone
	}

	if basic.ConsoleLog != nil || basic.FileLog != nil {
		consoleLog := conf.Config.Basic.ConsoleLog
		if basic.ConsoleLog != nil {
			consoleLog = *basic.ConsoleLog
		}
		fileLog := conf.Config.Basic.FileLog
		if basic.FileLog != nil {
			fileLog = *basic.FileLog
		}
		if err := conf.SetConsoleAndFileLog(consoleLog, fileLog); err != nil {
			w.WriteHeader(http.StatusBadRequest)
			handleError(w, err, "", logger)
			return
		}
		conf.Config.Basic.ConsoleLog = consoleLog
		conf.Config.Basic.FileLog = fileLog
	}

	w.WriteHeader(http.StatusNoContent)
}

func configurationStatusHandler(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()
	content := configurationStatusExport()
	jsonResponse(content, w, logger)
}

func importRuleSetPartial(all processor.Ruleset) processor.Ruleset {
	ruleSetRsp := processor.Ruleset{
		Rules:   map[string]string{},
		Streams: map[string]string{},
		Tables:  map[string]string{},
	}
	// replace streams
	for k, v := range all.Streams {
		_, e := streamProcessor.ExecReplaceStream(k, v, ast.TypeStream)
		if e != nil {
			ruleSetRsp.Streams[k] = e.Error()
			continue
		}
	}
	// replace tables
	for k, v := range all.Tables {
		_, e := streamProcessor.ExecReplaceStream(k, v, ast.TypeTable)
		if e != nil {
			ruleSetRsp.Tables[k] = e.Error()
			continue
		}
	}

	for k, v := range all.Rules {
		_, err := ruleProcessor.GetRuleJson(k)
		if err == nil {
			// the rule already exist, update
			err = updateRule(k, v)
			if err != nil {
				ruleSetRsp.Rules[k] = err.Error()
				continue
			}
			// Update to db after validation
			_, err = ruleProcessor.ExecUpdate(k, v)

			if err != nil {
				ruleSetRsp.Rules[k] = err.Error()
				continue
			}
		} else {
			// not found, create
			_, err2 := createRule(k, v)
			if err2 != nil {
				ruleSetRsp.Rules[k] = err2.Error()
				continue
			}
		}
	}

	return ruleSetRsp
}

func uploadsReset() {
	_ = uploadsDb.Clean()
	_ = uploadsStatusDb.Clean()
}

func uploadsExport() map[string]string {
	conf, _ := uploadsDb.All()
	return conf
}

func uploadsStatusExport() map[string]string {
	status, _ := uploadsDb.All()
	return status
}

func uploadsImport(s map[string]string) map[string]string {
	errMap := map[string]string{}
	_ = uploadsStatusDb.Clean()
	for k, v := range s {
		fc := &fileContent{}
		err := json.Unmarshal([]byte(v), fc)
		if err != nil {
			errMsg := fmt.Sprintf("invalid body: Error decoding file json: %s", err.Error())
			errMap[k] = errMsg
			_ = uploadsStatusDb.Set(k, errMsg)
			continue
		}

		err = fc.Validate()
		if err != nil {
			errMap[k] = err.Error()
			_ = uploadsStatusDb.Set(k, err.Error())
			continue
		}

		err = upload(fc)
		if err != nil {
			errMap[k] = err.Error()
			continue
		}
	}
	return errMap
}