ekuiper-new/internal/topo/graph/io.go

// Copyright 2022 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 graph

import "fmt"

type IoInputType uint8
type IoRowType uint8
type IoCollectionType uint8

const (
	IOINPUT_TYPE_SAME       IoInputType = iota
	IOINPUT_TYPE_ROW                    // 0b01
	IOINPUT_TYPE_COLLECTION             // 0b10
	IOINPUT_TYPE_ANY                    // 0b11
)

var inputTypes = map[IoInputType]string{
	IOINPUT_TYPE_ROW:        "row",
	IOINPUT_TYPE_COLLECTION: "collection",
	IOINPUT_TYPE_ANY:        "any",
	IOINPUT_TYPE_SAME:       "same",
}

const (
	IOROW_TYPE_SAME   IoRowType = iota
	IOROW_TYPE_SINGLE           // 0b01
	IOROW_TYPE_MERGED           // 0b10
	IOROW_TYPE_ANY              // 0b11
)

var rowTypes = map[IoRowType]string{
	IOROW_TYPE_SINGLE: "single emitter row",
	IOROW_TYPE_MERGED: "merged row",
	IOROW_TYPE_ANY:    "any",
	IOROW_TYPE_SAME:   "same",
}

const (
	IOCOLLECTION_TYPE_SAME IoCollectionType = iota
	IOCOLLECTION_TYPE_SINGLE
	IOCOLLECTION_TYPE_GROUPED
	IOCOLLECTION_TYPE_ANY
)

var collectionsTypes = map[IoCollectionType]string{
	IOCOLLECTION_TYPE_SINGLE:  "non-grouped collection",
	IOCOLLECTION_TYPE_GROUPED: "grouped collection",
	IOCOLLECTION_TYPE_ANY:     "any",
	IOCOLLECTION_TYPE_SAME:    "same",
}

// IOType is the type of input/output
// all fields are default to any
type IOType struct {
	Type           IoInputType      `json:"type"`
	RowType        IoRowType        `json:"rowType"`
	CollectionType IoCollectionType `json:"collectionType"`
	AllowMulti     bool             `json:"allowMulti"`
}

// NewIOType creates a new IOType
func NewIOType() *IOType {
	return &IOType{
		Type:           IOINPUT_TYPE_ANY,
		RowType:        IOROW_TYPE_ANY,
		CollectionType: IOCOLLECTION_TYPE_ANY,
	}
}

func Fit(value, condition *IOType) (bool, error) {
	if value.Type&condition.Type == 0 {
		return false, fmt.Errorf("input type mismatch, expect %s, got %s", inputTypes[condition.Type], inputTypes[value.Type])
	}
	if value.RowType&condition.RowType == 0 {
		return false, fmt.Errorf("row type mismatch, expect %s, got %s", rowTypes[condition.RowType], rowTypes[value.RowType])
	}
	if value.CollectionType&condition.CollectionType == 0 {
		return false, fmt.Errorf("collection type mismatch, expect %s, got %s", collectionsTypes[condition.CollectionType], collectionsTypes[value.CollectionType])
	}
	return true, nil
}

func MapOut(previous, origin *IOType) (result *IOType) {
	result = NewIOType()
	if origin.Type == IOINPUT_TYPE_SAME {
		result.Type = previous.Type
		result.RowType = previous.RowType
		result.CollectionType = previous.CollectionType
	} else {
		result.Type = origin.Type
		if origin.RowType == IOROW_TYPE_SAME {
			result.RowType = previous.RowType
		} else {
			result.RowType = origin.RowType
		}
		if origin.CollectionType == IOCOLLECTION_TYPE_SAME {
			result.CollectionType = previous.CollectionType
		} else {
			result.CollectionType = origin.CollectionType
		}
	}
	return
}

// OpIO The io constraints for a node
var OpIO = map[string][]*IOType{
	"aggfunc": {
		{Type: IOINPUT_TYPE_COLLECTION, RowType: IOROW_TYPE_ANY, CollectionType: IOCOLLECTION_TYPE_ANY},
		{Type: IOINPUT_TYPE_COLLECTION, CollectionType: IOCOLLECTION_TYPE_GROUPED},
	},
	"filter": {
		{Type: IOINPUT_TYPE_ANY, RowType: IOROW_TYPE_ANY, CollectionType: IOCOLLECTION_TYPE_ANY},
		{Type: IOINPUT_TYPE_SAME},
	},
	"function": {
		{Type: IOINPUT_TYPE_ANY, CollectionType: IOCOLLECTION_TYPE_SINGLE, RowType: IOROW_TYPE_ANY},
		{Type: IOINPUT_TYPE_SAME},
	},
	"groupby": {
		{Type: IOINPUT_TYPE_COLLECTION, CollectionType: IOCOLLECTION_TYPE_SINGLE, RowType: IOROW_TYPE_ANY},
		{Type: IOINPUT_TYPE_COLLECTION, CollectionType: IOCOLLECTION_TYPE_GROUPED},
	},
	"join": {
		{Type: IOINPUT_TYPE_COLLECTION, CollectionType: IOCOLLECTION_TYPE_SINGLE, RowType: IOROW_TYPE_SINGLE},
		{Type: IOINPUT_TYPE_COLLECTION, CollectionType: IOCOLLECTION_TYPE_SINGLE, RowType: IOROW_TYPE_MERGED},
	},
	"orderby": {
		{Type: IOINPUT_TYPE_COLLECTION, RowType: IOROW_TYPE_ANY, CollectionType: IOCOLLECTION_TYPE_ANY},
		{Type: IOINPUT_TYPE_SAME},
	},
	"pick": {
		{Type: IOINPUT_TYPE_ANY, RowType: IOROW_TYPE_ANY, CollectionType: IOCOLLECTION_TYPE_ANY},
		{Type: IOINPUT_TYPE_SAME},
	},
	"window": {
		{Type: IOINPUT_TYPE_ROW, RowType: IOROW_TYPE_ANY, CollectionType: IOCOLLECTION_TYPE_ANY, AllowMulti: true},
		{Type: IOINPUT_TYPE_COLLECTION, CollectionType: IOCOLLECTION_TYPE_SINGLE, RowType: IOROW_TYPE_SINGLE},
	},
}