feat: initial logic

.gitignore

@@ -19,3 +19,7 @@
 
 # Go workspace file
 go.work
+
+dist/
+
+tests/

.goreleaser.yaml

@@ -0,0 +1,46 @@
+# This is an example .goreleaser.yml file with some sensible defaults.
+# Make sure to check the documentation at https://goreleaser.com
+
+# The lines below are called `modelines`. See `:help modeline`
+# Feel free to remove those if you don't want/need to use them.
+# yaml-language-server: $schema=https://goreleaser.com/static/schema.json
+# vim: set ts=2 sw=2 tw=0 fo=cnqoj
+
+version: 1
+
+before:
+  hooks:
+    # You may remove this if you don't use go modules.
+    - go mod tidy
+    # you may remove this if you don't need go generate
+    - go generate ./...
+
+builds:
+  - env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+
+archives:
+  - format: tar.gz
+    # this name template makes the OS and Arch compatible with the results of `uname`.
+    name_template: >-
+      {{ .ProjectName }}_
+      {{- title .Os }}_
+      {{- if eq .Arch "amd64" }}x86_64
+      {{- else if eq .Arch "386" }}i386
+      {{- else }}{{ .Arch }}{{ end }}
+      {{- if .Arm }}v{{ .Arm }}{{ end }}
+    # use zip for windows archives
+    format_overrides:
+      - goos: windows
+        format: zip
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - "^docs:"
+      - "^test:"

cli.go

@@ -0,0 +1,60 @@
+package main
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/urfave/cli/v2"
+)
+
+func off(ctx *cli.Context) error {
+	mbtilesFilepath := ctx.Args().Get(0)
+	if !fileExists(mbtilesFilepath) {
+		log.Fatal(fmt.Sprintf("MBTiles file path in %s does not exist.", mbtilesFilepath))
+	}
+	conn, err := createConn(mbtilesFilepath)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer conn.db.Close()
+	rawKeyValue := ctx.Args().Get(1)
+	keyValue, err := parseKeyValue(rawKeyValue)
+	if err != nil {
+		log.Fatal(err)
+	}
+	results, err := conn.find(keyValue)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if len(results) != 0 {
+		if err := conn.update(results); err != nil {
+			log.Fatal(err)
+		}
+	} else {
+		log.Fatal(fmt.Sprintf("The key value %s was not present in the MBTiles file. Nothing was removed.", keyValue))
+	}
+
+	return nil
+
+}
+
+func startCli() *cli.App {
+
+	// Version Flag
+	cli.VersionFlag = &cli.BoolFlag{
+		Name:    "version",
+		Aliases: []string{"V"},
+		Usage:   "Print out version",
+	}
+
+	// Main CLI
+	app := &cli.App{
+		Name: "Mboff",
+		// Version: "v0.0.1",
+		Usage:  "Mboff optimises your mbtiles by removing unnecessary data.",
+		Action: off,
+	}
+
+	return app
+
+}

db.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"database/sql"
+	"strconv"
+
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/paulmach/orb/encoding/mvt"
+	"github.com/paulmach/orb/geojson"
+)
+
+func createConn(fp string) (*dbConn, error) {
+	db, err := sql.Open("sqlite3", fp)
+	if err != nil {
+		return nil, err
+	}
+	return &dbConn{db: db}, nil
+}
+
+func (conn *dbConn) find(keyValue *kv) ([]result, error) {
+
+	rows, err := conn.db.Query("SELECT * FROM images;")
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var results []result
+
+	for rows.Next() {
+		var zoomLevel int
+		var tileData []byte
+		var tileId string
+		err = rows.Scan(&zoomLevel, &tileData, &tileId)
+		if err != nil {
+			panic(err)
+		}
+		l, err := mvt.UnmarshalGzipped(tileData)
+		if err != nil {
+			panic(err)
+		}
+		layers := l.ToFeatureCollections()
+		newLayers := make(map[string]*geojson.FeatureCollection, len(layers))
+		for i := range layers {
+			layer := layers[i]
+			newLayer := geojson.NewFeatureCollection()
+			for _, f := range layer.Features {
+				newFeature := geojson.NewFeature(f.Geometry)
+				newFeature.Properties = f.Properties
+				newFeature.Properties["id"] = strconv.FormatInt(int64(newFeature.Properties["id"].(float64)), 10)
+				if newFeature.Properties[keyValue.key] != keyValue.value {
+					newLayer.Append(newFeature)
+				}
+			}
+			newLayers[i] = newLayer
+		}
+		newTileData, err := mvt.MarshalGzipped(mvt.NewLayers(newLayers))
+		if err != nil {
+			return nil, err
+		}
+		results = append(results, result{zoomLevel: zoomLevel, tileId: tileId, tileData: newTileData})
+	}
+	err = rows.Err()
+	if err != nil {
+		return nil, err
+	}
+
+	return results, nil
+
+}
+
+func (conn *dbConn) update(results []result) error {
+
+	stmt, err := conn.db.Prepare("UPDATE images SET tile_data = ? WHERE tile_id = ? AND zoom_level = ?;")
+	if err != nil {
+		return err
+	}
+	defer stmt.Close()
+
+	for _, result := range results {
+		_, err = stmt.Exec(result.tileData, result.tileId, result.zoomLevel)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+
+}

go.mod

@@ -0,0 +1,18 @@
+module github.com/jjcfrancisco/mboff
+
+go 1.21.0
+
+require (
+	github.com/mattn/go-sqlite3 v1.14.22
+	github.com/paulmach/orb v0.11.1
+	github.com/urfave/cli/v2 v2.27.2
+)
+
+require (
+	github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/paulmach/protoscan v0.2.1 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/xrash/smetrics v0.0.0-20240312152122-5f08fbb34913 // indirect
+	go.mongodb.org/mongo-driver v1.11.4 // indirect
+)

go.sum

@@ -0,0 +1,89 @@
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -0,0 +1,15 @@
+package main
+
+import (
+	"log"
+	"os"
+)
+
+func main() {
+	app := startCli()
+	app.Suggest = true
+
+	if err := app.Run(os.Args); err != nil {
+		log.Fatal(err)
+	}
+}

types.go

@@ -0,0 +1,19 @@
+package main
+
+import "database/sql"
+
+type result struct {
+	zoomLevel int
+	tileId    string
+	tileData  []byte
+}
+
+type dbConn struct {
+	db *sql.DB
+}
+
+type kv struct {
+	key   string
+	value string
+}
+

utils.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func fileExists(filename string) bool {
+	info, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return false
+	}
+	return !info.IsDir()
+}
+
+func parseKeyValue(str string) (*kv, error) {
+	parts := strings.SplitN(str, "=", 2)
+	if len(parts) != 2 {
+		return nil, fmt.Errorf("invalid format: expected key=value")
+	}
+	return &kv{key: parts[0], value: parts[1]}, nil
+}