New functions to generate random latitude and longitude coordinates within a specified polygon

.gitignore

@@ -42,6 +42,8 @@ _testmain.go
 *.iml
 .idea/
 .idea
+.vscode/
+.vscode
 .DS_Store
 
 # Specific project files
@@ -53,4 +55,4 @@ pkg/producers/redis/config.json
 pkg/producers/elastic/*.json
 pkg/producers/mongoDB/*.json
 pkg/producers/gcs/*.json
-pkg/producers/s3/*.json
+pkg/producers/s3/*.json

Makefile

@@ -110,4 +110,4 @@ install:
 	install build/jr /usr/local/bin
 
 all: hello install-gogen generate compile
-all_offline: hello generate compile
+all_offline: hello generate compile

go.mod

@@ -165,13 +165,15 @@ require (
 
 require (
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cnkei/gospline v0.0.0-20191204052713-d67fac29a294
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
 	github.com/invopop/jsonschema v0.12.0 // indirect
 	github.com/magiconair/properties v1.8.7 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/paulmach/go.geojson v1.5.0
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
 	github.com/santhosh-tekuri/jsonschema/v5 v5.3.1 // indirect
 	github.com/spf13/afero v1.11.0 // indirect

pkg/cmd/templateRun.go

@@ -61,6 +61,7 @@ jr template run --template "{{name}}"
 		preload, _ := cmd.Flags().GetInt("preload")
 
 		csv, _ := cmd.Flags().GetString("csv")
+		geojson, _ := cmd.Flags().GetString("geojson")
 
 		if kcat {
 			oneline = true
@@ -145,6 +146,7 @@ jr template run --template "{{name}}"
 			Kcat:             kcat,
 			Oneline:          oneline,
 			Csv:              csv,
+			GeoJson:          geojson,
 		}
 
 		functions.SetSeed(seed)
@@ -164,6 +166,8 @@ func init() {
 
 	templateRunCmd.Flags().String("csv", "", "Path to csv file to use")
 
+	templateRunCmd.Flags().String("geojson", "", "Path to geojson file to use")
+
 	templateRunCmd.Flags().StringP("kafkaConfig", "F", "", "Kafka configuration")
 	templateRunCmd.Flags().String("registryConfig", "", "Kafka configuration")
 	templateRunCmd.Flags().Bool("embedded", false, "If enabled, [template] must be a string containing a template, to be embedded directly in the script")

pkg/ctx/context.go

@@ -42,14 +42,18 @@ type Context struct {
 	CtxListLock               sync.RWMutex
 	CtxCSV                    map[int]map[string]string
 	CtxCSVLock                sync.RWMutex
+	CtxGeoJson                [][]float64
+	CtxGeoJsonLock            sync.RWMutex
+	CtxLastPointLat           []float64
+	CtxLastPointLon           []float64
 	LastIndex                 int
 	CountryIndex              int
 	CityIndex                 int
 	CurrentIterationLoopIndex int
 }
 
 func init() {
-
+	var ctxgeojson [][]float64
 	JrContext = &Context{
 		StartTime:        time.Now(),
 		GeneratedBytes:   0,
@@ -63,6 +67,10 @@ func init() {
 		CtxListLock:      sync.RWMutex{},
 		CtxCSV:           make(map[int]map[string]string),
 		CtxCSVLock:       sync.RWMutex{},
+		CtxGeoJson:       ctxgeojson,
+		CtxGeoJsonLock:   sync.RWMutex{},
+		CtxLastPointLat:  []float64{},
+		CtxLastPointLon:  []float64{},
 		LastIndex:        -1,
 		CountryIndex:     232,
 		CityIndex:        -1,

pkg/emitter/emitter.go

@@ -23,10 +23,11 @@ package emitter
 import (
 	"context"
 	"fmt"
-	"github.com/jrnd-io/jr/pkg/producers/wasm"
 	"os"
 	"time"
 
+	"github.com/jrnd-io/jr/pkg/producers/wasm"
+
 	"github.com/jrnd-io/jr/pkg/configuration"
 	"github.com/jrnd-io/jr/pkg/constants"
 	jtctx "github.com/jrnd-io/jr/pkg/ctx"
@@ -65,6 +66,7 @@ type Emitter struct {
 	Kcat             bool          `mapstructure:"kcat"`
 	Oneline          bool          `mapstructure:"oneline"`
 	Csv              string        `mapstructure:"csv"`
+	GeoJson          string        `mapstructure:"geojson"`
 	Producer         Producer
 	KTpl             tpl.Tpl
 	VTpl             tpl.Tpl
@@ -74,6 +76,8 @@ func (e *Emitter) Initialize(ctx context.Context, conf configuration.GlobalConfi
 
 	functions.InitCSV(e.Csv)
 
+	functions.InitGeoJson(e.GeoJson)
+
 	templateName := e.ValueTemplate
 	if e.EmbeddedTemplate == "" {
 		path := os.ExpandEnv(fmt.Sprintf("%s/%s", constants.JR_SYSTEM_DIR, "templates"))
@@ -283,7 +287,6 @@ func createWASMProducer(ctx context.Context, config string) Producer {
 
 func createKafkaProducer(ctx context.Context, conf configuration.GlobalConfiguration, topic string, templateType string) *kafka.Manager {
 
-
 	kManager := &kafka.Manager{
 		Serializer:   conf.Serializer,
 		Topic:        topic,

pkg/functions/address.go

@@ -22,8 +22,11 @@ package functions
 
 import (
 	"fmt"
-	"github.com/jrnd-io/jr/pkg/ctx"
 	"math"
+	"os"
+
+	"github.com/cnkei/gospline"
+	"github.com/jrnd-io/jr/pkg/ctx"
 )
 
 const (
@@ -127,6 +130,199 @@ func NearbyGPS(latitude float64, longitude float64, radius int) string {
 
 }
 
+// NearbyGPSIntoPolygon generates a random latitude and longitude within a specified radius (in meters)
+// from an initial point and checks if the generated point falls within the boundaries of a polygon
+// defined in a GeoJSON file. If successful, it returns the coordinates as a formatted string.
+func NearbyGPSIntoPolygon(latitude float64, longitude float64, radius int) string {
+	// Lock the GeoJSON context to ensure thread safety
+	ctx.JrContext.CtxGeoJsonLock.Lock()
+	defer ctx.JrContext.CtxGeoJsonLock.Unlock()
+
+	// Default starting point: either use the provided coordinates or the last known point if available from ctx
+	lastLat := latitude
+	lastLon := longitude
+
+	// Update last known point if there are recent saved coordinates
+	if len(ctx.JrContext.CtxLastPointLat) == 1 {
+		lastLat = ctx.JrContext.CtxLastPointLat[len(ctx.JrContext.CtxLastPointLat)-1]
+	}
+	if len(ctx.JrContext.CtxLastPointLon) == 1 {
+		lastLon = ctx.JrContext.CtxLastPointLon[len(ctx.JrContext.CtxLastPointLon)-1]
+	}
+
+	// Predict the next point if there is enough data for interpolation
+	if len(ctx.JrContext.CtxLastPointLat) >= 2 && len(ctx.JrContext.CtxLastPointLon) >= 2 {
+		lastLat, lastLon = predictNextPoint(ctx.JrContext.CtxLastPointLat, ctx.JrContext.CtxLastPointLon)
+	}
+
+	// Ensure that the GeoJSON polygon has enough vertices (at least 3) to form a valid shape
+	if len(ctx.JrContext.CtxGeoJson) < 3 {
+		return fmt.Sprintf("%.12f %.12f", lastLat, lastLon)
+	}
+
+	// Convert radius to float for calculations
+	radiusInMeters := float64(radius)
+
+	attempts := 0
+
+	// Loop until a valid point within the polygon is found
+	for {
+		if attempts > 10 {
+			// Slightly expand the search radius to ensure coverage
+			radiusInMeters *= 1.1
+		}
+		// Generate a random angle and distance within the specified radius
+		randomAngle := Random.Float64() * 2 * math.Pi
+		distanceInMeters := Random.Float64() * radiusInMeters
+
+		// Convert the distance from meters to degrees (assuming small distances for simplicity)
+		distanceInDegrees := distanceInMeters * degreesPerMeter
+
+		// Calculate new latitude and longitude based on the random angle and distance
+		newLatitude := lastLat + (distanceInDegrees * math.Cos(randomAngle))
+		newLongitude := lastLon + (distanceInDegrees * math.Sin(randomAngle))
+
+		// Check if the generated point lies within the specified polygon
+		if isPointInPolygon([]float64{newLatitude, newLongitude}, ctx.JrContext.CtxGeoJson) {
+			// Update the context with the new valid point, maintaining a maximum ctx of 10 points
+			ctx.JrContext.CtxLastPointLat = append(ctx.JrContext.CtxLastPointLat, newLatitude)
+			ctx.JrContext.CtxLastPointLon = append(ctx.JrContext.CtxLastPointLon, newLongitude)
+
+			// Keep the last 10 points in the ctx
+			if len(ctx.JrContext.CtxLastPointLat) > 10 {
+				ctx.JrContext.CtxLastPointLat = ctx.JrContext.CtxLastPointLat[1:]
+			}
+			if len(ctx.JrContext.CtxLastPointLon) > 10 {
+				ctx.JrContext.CtxLastPointLon = ctx.JrContext.CtxLastPointLon[1:]
+			}
+			// Return the coordinates of the valid point
+			return fmt.Sprintf("%.12f %.12f", newLatitude, newLongitude)
+			// return fmt.Sprintf("%.12f %.12f %d %.12f", newLatitude, newLongitude, attempts, radiusInMeters)
+		}
+		attempts++
+		// Retry if the generated point is not within the polygon boundaries
+	}
+}
+
+// NearbyGPSIntoPolygonWithoutStart
+func NearbyGPSIntoPolygonWithoutStart(radius int) string {
+	latitude, longitude := selectRandomPoint(ctx.JrContext.CtxGeoJson)
+	return NearbyGPSIntoPolygon(latitude, longitude, radius)
+}
+
+// isPointInPolygon checks if a given point lies within a specified polygon.
+func isPointInPolygon(point []float64, vertices [][]float64) bool {
+	x, y := point[1], point[0]
+	n := len(vertices)
+	// A polygon must have at least 3 vertices
+	if n < 3 {
+		return false
+	}
+	intersections := 0
+	for i := 0; i < n; i++ {
+		x1, y1 := vertices[i][0], vertices[i][1]
+		x2, y2 := vertices[(i+1)%n][0], vertices[(i+1)%n][1]
+		if (y1 > y) != (y2 > y) {
+			xInt := (y-y1)*(x2-x1)/(y2-y1) + x1
+			if x < xInt {
+				intersections++
+			}
+		}
+	}
+	return intersections%2 == 1
+}
+
+// predictNextPoint predicts the next latitude and longitude using cubic spline interpolation
+func predictNextPoint(latitudes, longitudes []float64) (float64, float64) {
+	if len(longitudes) != len(latitudes) {
+		println("Need at least two points and matching latitude/longitude arrays: latitudes: ", len(latitudes), " e longitudes:", len(longitudes))
+		os.Exit(1)
+	}
+
+	if len(latitudes) < 2 && len(longitudes) < 2 {
+		fmt.Println("Need at least two points !")
+		return 0, 0
+	}
+
+	// Create X values based on indices (0, 1, 2, ...) for even spacing assumption
+	x := make([]float64, len(latitudes))
+	for i := 0; i < len(latitudes); i++ {
+		x[i] = float64(i)
+	}
+
+	// Create splines for latitude and longitude
+	latSpline := gospline.NewCubicSpline(x, latitudes)
+	lonSpline := gospline.NewCubicSpline(x, longitudes)
+
+	// Predict the next index position (next point in the sequence)
+	nextX := float64(len(latitudes))
+
+	// Interpolate to get the predicted latitude and longitude for nextX
+	nextLatitude := latSpline.At(nextX)
+	nextLongitude := lonSpline.At(nextX)
+
+	return nextLatitude, nextLongitude
+}
+
+// selectRandomPoint selects a random point within the polygon defined by the given coordinates.
+func selectRandomPoint(coords [][]float64) (float64, float64) {
+	if len(coords) == 0 {
+		return 0, 0 // Return zero values if no coordinates are provided
+	}
+
+	// Calculate the bounding box of the coordinates
+	minX, minY, maxX, maxY := boundingBox(coords)
+
+	var randX, randY float64
+
+	// Loop until a valid point within the polygon is found
+	for {
+		// Generate a random point within the bounding box
+		x := Random.Float64()*(maxX-minX) + minX
+		y := Random.Float64()*(maxY-minY) + minY
+
+		// Check if the generated point is within the polygon
+		if isPointInPolygon([]float64{y, x}, coords) {
+			randX = x
+			randY = y
+			break // Exit the loop once a valid point is found
+		}
+	}
+
+	return randY, randX // Return as (latitude, longitude)
+}
+
+// boundingBox calculates the minimum and maximum coordinates (bounding box) of the provided vertices.
+// It returns the coordinates of the bottom-left (minX, minY) and top-right (maxX, maxY) corners
+// of the bounding box that encompasses all the given vertices.
+func boundingBox(vertices [][]float64) (minX, minY, maxX, maxY float64) {
+	if len(vertices) == 0 {
+		return 0, 0, 0, 0 // Return zero values if no vertices are provided
+	}
+
+	// Initialize min and max values based on the first vertex
+	minX, minY = vertices[0][0], vertices[0][1]
+	maxX, maxY = minX, minY
+
+	// Iterate through vertices to find the bounding box
+	for _, vertex := range vertices {
+		x, y := vertex[0], vertex[1]
+		if x < minX {
+			minX = x
+		}
+		if y < minY {
+			minY = y
+		}
+		if x > maxX {
+			maxX = x
+		}
+		if y > maxY {
+			maxY = y
+		}
+	}
+	return
+}
+
 // State returns a random State
 func State() string {
 	s := Word("state")