feat(ext): restore image and geo functions

Signed-off-by: Jiyong Huang <huangjy@emqx.io>

extensions/functions/geohash/geohash.go

@@ -0,0 +1,296 @@
+// Copyright 2021-2024 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 main
+
+import (
+	"fmt"
+
+	"github.com/mmcloughlin/geohash"
+
+	"github.com/lf-edge/ekuiper/contract/v2/api"
+)
+
+type (
+	geohashEncode         struct{}
+	geohashEncodeInt      struct{}
+	geohashDecode         struct{}
+	geohashDecodeInt      struct{}
+	geohashBoundingBox    struct{}
+	geohashBoundingBoxInt struct{}
+	geohashNeighbor       struct{}
+	geohashNeighborInt    struct{}
+	geohashNeighbors      struct{}
+	geohashNeighborsInt   struct{}
+	position              struct {
+		Longitude float64
+		Latitude  float64
+	}
+)
+
+var (
+	GeohashEncode         geohashEncode
+	GeohashEncodeInt      geohashEncodeInt
+	GeohashDecode         geohashDecode
+	GeohashDecodeInt      geohashDecodeInt
+	GeohashBoundingBox    geohashBoundingBox
+	GeohashBoundingBoxInt geohashBoundingBoxInt
+	GeohashNeighbor       geohashNeighbor
+	GeohashNeighborInt    geohashNeighborInt
+	GeohashNeighbors      geohashNeighbors
+	GeohashNeighborsInt   geohashNeighborsInt
+	g_direction           = map[string]geohash.Direction{
+		"North":     geohash.North,
+		"NorthEast": geohash.NorthEast,
+		"East":      geohash.East,
+		"SouthEast": geohash.SouthEast,
+		"South":     geohash.South,
+		"SouthWest": geohash.SouthWest,
+		"West":      geohash.West,
+		"NorthWest": geohash.NorthWest,
+	}
+)
+
+func (r *geohashEncode) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashEncodeInt) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashDecode) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashDecodeInt) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashBoundingBox) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashBoundingBoxInt) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashNeighbor) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashNeighborInt) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashNeighbors) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashNeighborsInt) IsAggregate() bool {
+	return false
+}
+
+func (r *geohashEncode) Validate(args []any) error {
+	if len(args) != 2 {
+		return fmt.Errorf("The geohashEncode function supports 2 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashEncodeInt) Validate(args []any) error {
+	if len(args) != 2 {
+		return fmt.Errorf("The geohashEncodeInt function supports 2 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashDecode) Validate(args []any) error {
+	if len(args) != 1 {
+		return fmt.Errorf("The geohashDecode function supports 1 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashDecodeInt) Validate(args []any) error {
+	if len(args) != 1 {
+		return fmt.Errorf("The geohashDecodeInt function supports 1 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashBoundingBox) Validate(args []any) error {
+	if len(args) != 1 {
+		return fmt.Errorf("The geohashBoundingBox function supports 1 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashBoundingBoxInt) Validate(args []any) error {
+	if len(args) != 1 {
+		return fmt.Errorf("The geohashBoundingBoxInt function supports 1 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashNeighbor) Validate(args []any) error {
+	if len(args) != 2 {
+		return fmt.Errorf("The geohashNeighbor function supports 2 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashNeighborInt) Validate(args []any) error {
+	if len(args) != 2 {
+		return fmt.Errorf("The geohashNeighborInt function supports 2 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashNeighbors) Validate(args []any) error {
+	if len(args) != 1 {
+		return fmt.Errorf("The geohashNeighbors function supports 1 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashNeighborsInt) Validate(args []any) error {
+	if len(args) != 1 {
+		return fmt.Errorf("The geohashNeighborsInt function supports 1 parameters, but got %d", len(args))
+	}
+	return nil
+}
+
+func (r *geohashEncode) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	la, ok := args[0].(float64)
+	if !ok {
+		return fmt.Errorf("arg[0] is not a float, got %v", args[0]), false
+	}
+	lo, ok := args[1].(float64)
+	if !ok {
+		return fmt.Errorf("arg[1] is not a float, got %v", args[1]), false
+	}
+	return geohash.Encode(la, lo), true
+}
+
+func (r *geohashEncodeInt) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	la, ok := args[0].(float64)
+	if !ok {
+		return fmt.Errorf("arg[0] is not a float, got %v", args[0]), false
+	}
+	lo, ok := args[1].(float64)
+	if !ok {
+		return fmt.Errorf("arg[1] is not a float, got %v", args[1]), false
+	}
+	return geohash.EncodeInt(la, lo), true
+}
+
+func (r *geohashDecode) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	hash, ok := args[0].(string)
+	if !ok || 0 == len(hash) {
+		return fmt.Errorf("arg[0] is not a string, got %v", args[0]), false
+	}
+	if err := geohash.Validate(hash); nil != err {
+		return err, false
+	}
+	la, lo := geohash.Decode(hash)
+	return position{Longitude: lo, Latitude: la}, true
+}
+
+func (r *geohashDecodeInt) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	hash, ok := args[0].(uint64)
+	if !ok {
+		return fmt.Errorf("arg[0] is not a bigint, got %v", args[0]), false
+	}
+	la, lo := geohash.DecodeInt(hash)
+	return position{Longitude: lo, Latitude: la}, true
+}
+
+func (r *geohashBoundingBox) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	hash, ok := args[0].(string)
+	if !ok || 0 == len(hash) {
+		return fmt.Errorf("arg[0] is not a string, got %v", args[0]), false
+	}
+	if err := geohash.Validate(hash); nil != err {
+		return err, false
+	}
+	return geohash.BoundingBox(hash), true
+}
+
+func (r *geohashBoundingBoxInt) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	hash, ok := args[0].(uint64)
+	if !ok {
+		return fmt.Errorf("arg[0] is not a bigint, got %v", args[0]), false
+	}
+	return geohash.BoundingBoxInt(hash), true
+}
+
+func (r *geohashNeighbor) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	hash, ok := args[0].(string)
+	if !ok || 0 == len(hash) {
+		return fmt.Errorf("arg[0] is not a string, got %v", args[0]), false
+	}
+	if err := geohash.Validate(hash); nil != err {
+		return err, false
+	}
+	var directionCode geohash.Direction
+	direction, ok := args[1].(string)
+	if !ok || 0 == len(direction) {
+		return fmt.Errorf("arg[1] is not a string, got %v", args[1]), false
+	} else {
+		directionCode, ok = g_direction[direction]
+		if !ok {
+			return fmt.Errorf("arg[1] is valid, got %v", args[1]), false
+		}
+
+	}
+	return geohash.Neighbor(hash, directionCode), true
+}
+
+func (r *geohashNeighborInt) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	hash, ok := args[0].(uint64)
+	if !ok {
+		return fmt.Errorf("arg[0] is not a bigint, got %v", args[0]), false
+	}
+	var directionCode geohash.Direction
+	direction, ok := args[1].(string)
+	if !ok || 0 == len(direction) {
+		return fmt.Errorf("arg[1] is not a string, got %v", args[1]), false
+	} else {
+		directionCode, ok = g_direction[direction]
+		if !ok {
+			return fmt.Errorf("arg[1] is valid, got %v", args[1]), false
+		}
+	}
+	return geohash.NeighborInt(hash, directionCode), true
+}
+
+func (r *geohashNeighbors) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	hash, ok := args[0].(string)
+	if !ok || 0 == len(hash) {
+		return fmt.Errorf("arg[0] is not a string, got %v", args[0]), false
+	}
+	if err := geohash.Validate(hash); nil != err {
+		return err, false
+	}
+	return geohash.Neighbors(hash), true
+}
+
+func (r *geohashNeighborsInt) Exec(args []any, _ api.FunctionContext) (any, bool) {
+	hash, ok := args[0].(uint64)
+	if !ok {
+		return fmt.Errorf("arg[0] is not a bigint, got %v", args[0]), false
+	}
+	return geohash.NeighborsInt(hash), true
+}