ekuiper-new/internal/topo/operator/field_processor.go

// Copyright 2021 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 operator

import (
	"encoding/base64"
	"encoding/json"
	"fmt"
	"github.com/lf-edge/ekuiper/internal/conf"
	"github.com/lf-edge/ekuiper/internal/xsql"
	"github.com/lf-edge/ekuiper/pkg/ast"
	"github.com/lf-edge/ekuiper/pkg/cast"
	"github.com/lf-edge/ekuiper/pkg/message"
	"math"
	"reflect"
	"strconv"
	"time"
)

type defaultFieldProcessor struct {
	streamFields     []interface{}
	timestampFormat  string
	isBinary         bool
	strictValidation bool
}

func (p *defaultFieldProcessor) processField(tuple *xsql.Tuple, _ *xsql.FunctionValuer) (map[string]interface{}, error) {
	result := make(map[string]interface{})
	if p.streamFields != nil {
		for _, f := range p.streamFields {
			switch sf := f.(type) {
			case *ast.StreamField:
				if p.isBinary {
					tuple.Message[sf.Name] = tuple.Message[message.DefaultField]
				}
				if e := p.addRecField(sf.FieldType, result, tuple.Message, sf.Name); e != nil {
					return nil, e
				}
			case string: //schemaless
				if p.isBinary {
					result = tuple.Message
				} else {
					if m, ok := tuple.Message.Value(sf, ""); ok {
						result[sf] = m
					}
				}
			}
			if p.isBinary {
				break //binary format should only have ONE field
			}
		}
	} else {
		result = tuple.Message
	}
	return result, nil
}

func (p *defaultFieldProcessor) addRecField(ft ast.FieldType, r map[string]interface{}, j xsql.Message, n string) error {
	if t, ok := j.Value(n, ""); ok {
		v := reflect.ValueOf(t)
		jtype := v.Kind()
		switch st := ft.(type) {
		case *ast.BasicType:
			switch st.Type {
			case ast.UNKNOWN:
				return fmt.Errorf("invalid data type unknown defined for %s, please check the stream definition", t)
			case ast.BIGINT:
				if jtype == reflect.Int {
					r[n] = t.(int)
				} else if jtype == reflect.Float64 {
					if tt, ok1 := t.(float64); ok1 {
						if tt > math.MaxInt64 {
							r[n] = uint64(tt)
						} else {
							r[n] = int(tt)
						}
					}
				} else if jtype == reflect.String {
					if i, err := strconv.Atoi(t.(string)); err != nil {
						return fmt.Errorf("invalid data type for %s, expect bigint but found %[2]T(%[2]v)", n, t)
					} else {
						r[n] = i
					}
				} else if jtype == reflect.Uint64 {
					r[n] = t.(uint64)
				} else {
					return fmt.Errorf("invalid data type for %s, expect bigint but found %[2]T(%[2]v)", n, t)
				}
			case ast.FLOAT:
				if jtype == reflect.Float64 {
					r[n] = t.(float64)
				} else if jtype == reflect.String {
					if f, err := strconv.ParseFloat(t.(string), 64); err != nil {
						return fmt.Errorf("invalid data type for %s, expect float but found %[2]T(%[2]v)", n, t)
					} else {
						r[n] = f
					}
				} else {
					return fmt.Errorf("invalid data type for %s, expect float but found %[2]T(%[2]v)", n, t)
				}
			case ast.STRINGS:
				if jtype == reflect.String {
					r[n] = t.(string)
				} else {
					return fmt.Errorf("invalid data type for %s, expect string but found %[2]T(%[2]v)", n, t)
				}
			case ast.DATETIME:
				switch jtype {
				case reflect.Int:
					ai := t.(int64)
					r[n] = cast.TimeFromUnixMilli(ai)
				case reflect.Float64:
					ai := int64(t.(float64))
					r[n] = cast.TimeFromUnixMilli(ai)
				case reflect.String:
					if t, err := p.parseTime(t.(string)); err != nil {
						return fmt.Errorf("invalid data type for %s, cannot convert to datetime: %s", n, err)
					} else {
						r[n] = t
					}
				default:
					return fmt.Errorf("invalid data type for %s, expect datatime but find %[2]T(%[2]v)", n, t)
				}
			case ast.BOOLEAN:
				if jtype == reflect.Bool {
					r[n] = t.(bool)
				} else if jtype == reflect.String {
					if i, err := strconv.ParseBool(t.(string)); err != nil {
						return fmt.Errorf("invalid data type for %s, expect boolean but found %[2]T(%[2]v)", n, t)
					} else {
						r[n] = i
					}
				} else {
					return fmt.Errorf("invalid data type for %s, expect boolean but found %[2]T(%[2]v)", n, t)
				}
			case ast.BYTEA:
				if jtype == reflect.String {
					if b, err := base64.StdEncoding.DecodeString(t.(string)); err != nil {
						return fmt.Errorf("invalid data type for %s, expect bytea but found %[2]T(%[2]v) which cannot base64 decode", n, t)
					} else {
						r[n] = b
					}
				} else if jtype == reflect.Slice {
					if b, ok := t.([]byte); ok {
						r[n] = b
					} else {
						return fmt.Errorf("invalid data type for %s, expect bytea but found %[2]T(%[2]v)", n, t)
					}
				}
			default:
				return fmt.Errorf("invalid data type for %s, it is not supported yet", st)
			}
		case *ast.ArrayType:
			var s []interface{}
			if t == nil {
				s = nil
			} else if jtype == reflect.Slice {
				s = t.([]interface{})
			} else if jtype == reflect.String {
				err := json.Unmarshal([]byte(t.(string)), &s)
				if err != nil {
					return fmt.Errorf("invalid data type for %s, expect array but found %[2]T(%[2]v)", n, t)
				}
			} else {
				return fmt.Errorf("invalid data type for %s, expect array but found %[2]T(%[2]v)", n, t)
			}

			if tempArr, err := p.addArrayField(st, s); err != nil {
				return fmt.Errorf("fail to parse field %s: %s", n, err)
			} else {
				r[n] = tempArr
			}
		case *ast.RecType:
			nextJ := make(map[string]interface{})
			if t == nil {
				nextJ = nil
				r[n] = nextJ
				return nil
			} else if jtype == reflect.Map {
				nextJ, ok = t.(map[string]interface{})
				if !ok {
					return fmt.Errorf("invalid data type for %s, expect map but found %[2]T(%[2]v)", n, t)
				}
			} else if jtype == reflect.String {
				err := json.Unmarshal([]byte(t.(string)), &nextJ)
				if err != nil {
					return fmt.Errorf("invalid data type for %s, expect map but found %[2]T(%[2]v)", n, t)
				}
			} else {
				return fmt.Errorf("invalid data type for %s, expect struct but found %[2]T(%[2]v)", n, t)
			}
			nextR := make(map[string]interface{})
			for _, nextF := range st.StreamFields {
				nextP := nextF.Name
				if e := p.addRecField(nextF.FieldType, nextR, nextJ, nextP); e != nil {
					return e
				}
			}
			r[n] = nextR
		default:
			return fmt.Errorf("unsupported type %T", st)
		}
	} else {
		if p.strictValidation {
			return fmt.Errorf("invalid data %s, field %s not found", j, n)
		} else {
			switch st := ft.(type) {
			case *ast.BasicType:
				switch st.Type {
				case ast.UNKNOWN:
					return fmt.Errorf("invalid data type unknown defined for %s, please check the stream definition", t)
				case ast.BIGINT:
					r[n] = int64(0)
				case ast.FLOAT:
					r[n] = 0.0
				case ast.STRINGS:
					r[n] = ""
				case ast.DATETIME:
					r[n] = conf.GetNow()
				case ast.BOOLEAN:
					r[n] = false
				case ast.BYTEA:
					r[n] = []byte{}
				default:
					return fmt.Errorf("invalid data type for %s, it is not supported yet", st)
				}
			case *ast.ArrayType:
				if tempArr, err := p.addArrayField(st, nil); err != nil {
					return fmt.Errorf("fail to parse field %s: %s", n, err)
				} else {
					r[n] = tempArr
				}
			case *ast.RecType:
				r[n] = make(map[string]interface{})
			default:
				return fmt.Errorf("unsupported type %T", st)
			}
		}
	}
	return nil
}

//ft must be ast.ArrayType
//side effect: r[p] will be set to the new array
func (p *defaultFieldProcessor) addArrayField(ft *ast.ArrayType, srcSlice []interface{}) (interface{}, error) {
	if ft.FieldType != nil { //complex type array or struct
		switch st := ft.FieldType.(type) { //Only two complex types supported here
		case *ast.ArrayType: //TODO handle array of array. Now the type is treated as interface{}
			if srcSlice == nil {
				return [][]interface{}(nil), nil
			}
			var s []interface{}
			var tempSlice reflect.Value
			for i, t := range srcSlice {
				jtype := reflect.ValueOf(t).Kind()
				if t == nil {
					s = nil
				} else if jtype == reflect.Slice || jtype == reflect.Array {
					s = t.([]interface{})
				} else if jtype == reflect.String {
					err := json.Unmarshal([]byte(t.(string)), &s)
					if err != nil {
						return nil, fmt.Errorf("invalid data type for [%d], expect array but found %[2]T(%[2]v)", i, t)
					}
				} else {
					return nil, fmt.Errorf("invalid data type for [%d], expect array but found %[2]T(%[2]v)", i, t)
				}
				if tempArr, err := p.addArrayField(st, s); err != nil {
					return nil, err
				} else {
					if !tempSlice.IsValid() {
						s := reflect.TypeOf(tempArr)
						tempSlice = reflect.MakeSlice(reflect.SliceOf(s), 0, 0)
					}
					tempSlice = reflect.Append(tempSlice, reflect.ValueOf(tempArr))
				}
			}
			return tempSlice.Interface(), nil
		case *ast.RecType:
			if srcSlice == nil {
				return []map[string]interface{}(nil), nil
			}
			tempSlice := make([]map[string]interface{}, 0)
			for i, t := range srcSlice {
				jtype := reflect.ValueOf(t).Kind()
				j := make(map[string]interface{})
				var ok bool
				if t == nil {
					j = nil
					tempSlice = append(tempSlice, j)
					continue
				} else if jtype == reflect.Map {
					j, ok = t.(map[string]interface{})
					if !ok {
						return nil, fmt.Errorf("invalid data type for [%d], expect map but found %[2]T(%[2]v)", i, t)
					}

				} else if jtype == reflect.String {
					err := json.Unmarshal([]byte(t.(string)), &j)
					if err != nil {
						return nil, fmt.Errorf("invalid data type for [%d], expect map but found %[2]T(%[2]v)", i, t)
					}
				} else {
					return nil, fmt.Errorf("invalid data type for [%d], expect map but found %[2]T(%[2]v)", i, t)
				}
				r := make(map[string]interface{})
				for _, f := range st.StreamFields {
					n := f.Name
					if e := p.addRecField(f.FieldType, r, j, n); e != nil {
						return nil, e
					}
				}
				tempSlice = append(tempSlice, r)
			}
			return tempSlice, nil
		default:
			return nil, fmt.Errorf("unsupported type %T", st)
		}
	} else { //basic type
		switch ft.Type {
		case ast.UNKNOWN:
			return nil, fmt.Errorf("invalid data type unknown defined for %s, please checke the stream definition", srcSlice)
		case ast.BIGINT:
			if srcSlice == nil {
				return []int(nil), nil
			}
			tempSlice := make([]int, 0)
			for i, t := range srcSlice {
				jtype := reflect.ValueOf(t).Kind()
				if jtype == reflect.Float64 {
					tempSlice = append(tempSlice, int(t.(float64)))
				} else if jtype == reflect.String {
					if v, err := strconv.Atoi(t.(string)); err != nil {
						return nil, fmt.Errorf("invalid data type for [%d], expect float but found %[2]T(%[2]v)", i, t)
					} else {
						tempSlice = append(tempSlice, v)
					}
				} else {
					return nil, fmt.Errorf("invalid data type for [%d], expect float but found %[2]T(%[2]v)", i, t)
				}
			}
			return tempSlice, nil
		case ast.FLOAT:
			if srcSlice == nil {
				return []float64(nil), nil
			}
			tempSlice := make([]float64, 0)
			for i, t := range srcSlice {
				jtype := reflect.ValueOf(t).Kind()
				if jtype == reflect.Float64 {
					tempSlice = append(tempSlice, t.(float64))
				} else if jtype == reflect.String {
					if f, err := strconv.ParseFloat(t.(string), 64); err != nil {
						return nil, fmt.Errorf("invalid data type for [%d], expect float but found %[2]T(%[2]v)", i, t)
					} else {
						tempSlice = append(tempSlice, f)
					}
				} else {
					return nil, fmt.Errorf("invalid data type for [%d], expect float but found %[2]T(%[2]v)", i, t)
				}
			}
			return tempSlice, nil
		case ast.STRINGS:
			if srcSlice == nil {
				return []string(nil), nil
			}
			tempSlice := make([]string, 0)
			for i, t := range srcSlice {
				if reflect.ValueOf(t).Kind() == reflect.String {
					tempSlice = append(tempSlice, t.(string))
				} else {
					return nil, fmt.Errorf("invalid data type for [%d], expect string but found %[2]T(%[2]v)", i, t)
				}
			}
			return tempSlice, nil
		case ast.DATETIME:
			if srcSlice == nil {
				return []time.Time(nil), nil
			}
			tempSlice := make([]time.Time, 0)
			for i, t := range srcSlice {
				jtype := reflect.ValueOf(t).Kind()
				switch jtype {
				case reflect.Int:
					ai := t.(int64)
					tempSlice = append(tempSlice, cast.TimeFromUnixMilli(ai))
				case reflect.Float64:
					ai := int64(t.(float64))
					tempSlice = append(tempSlice, cast.TimeFromUnixMilli(ai))
				case reflect.String:
					if ai, err := p.parseTime(t.(string)); err != nil {
						return nil, fmt.Errorf("invalid data type for %s, cannot convert to datetime: %[2]T(%[2]v)", t, err)
					} else {
						tempSlice = append(tempSlice, ai)
					}
				default:
					return nil, fmt.Errorf("invalid data type for [%d], expect datetime but found %[2]T(%[2]v)", i, t)
				}
			}
			return tempSlice, nil
		case ast.BOOLEAN:
			if srcSlice == nil {
				return []bool(nil), nil
			}
			tempSlice := make([]bool, 0)
			for i, t := range srcSlice {
				jtype := reflect.ValueOf(t).Kind()
				if jtype == reflect.Bool {
					tempSlice = append(tempSlice, t.(bool))
				} else if jtype == reflect.String {
					if v, err := strconv.ParseBool(t.(string)); err != nil {
						return nil, fmt.Errorf("invalid data type for [%d], expect boolean but found %[2]T(%[2]v)", i, t)
					} else {
						tempSlice = append(tempSlice, v)
					}
				} else {
					return nil, fmt.Errorf("invalid data type for [%d], expect boolean but found %[2]T(%[2]v)", i, t)
				}
			}
			return tempSlice, nil
		case ast.BYTEA:
			if srcSlice == nil {
				return [][]byte(nil), nil
			}
			tempSlice := make([][]byte, 0)
			for i, t := range srcSlice {
				jtype := reflect.ValueOf(t).Kind()
				if jtype == reflect.String {
					if b, err := base64.StdEncoding.DecodeString(t.(string)); err != nil {
						return nil, fmt.Errorf("invalid data type for [%d], expect bytea but found %[2]T(%[2]v) which cannot base64 decode", i, t)
					} else {
						tempSlice = append(tempSlice, b)
					}
				} else if jtype == reflect.Slice {
					if b, ok := t.([]byte); ok {
						tempSlice = append(tempSlice, b)
					} else {
						return nil, fmt.Errorf("invalid data type for [%d], expect bytea but found %[2]T(%[2]v)", i, t)
					}
				}
			}
			return tempSlice, nil
		default:
			return nil, fmt.Errorf("invalid data type for %T", ft.Type)
		}
	}
}

func (p *defaultFieldProcessor) parseTime(s string) (time.Time, error) {
	if p.timestampFormat != "" {
		return cast.ParseTime(s, p.timestampFormat)
	} else {
		return time.Parse(cast.JSISO, s)
	}
}