commit 3da5d6a5609e1c0c44d9edc71e356c30d28e6b93
Author: Pascal <pascal@pdev.dev>
Date:   Fri Sep 30 14:59:51 2022 -0500

    [add] initial commit

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..b42ef15
--- /dev/null
+++ b/README.md
@@ -0,0 +1,32 @@
+<h1 align="center">[WIP] Gelvin</h1>
+
+<h4 align="center">
+	REST API for IoT Sensors.
+</h4>
+
+`Gelvin` is a simple REST-API for IoT Sensors. Currently work in progess. API is subject to change.
+
+<p align="center">
+    <strong>
+        <a href="https://api.pdev.dev/gelvin/measurements/2">My Office Temp (°C)</a>
+        • <a href="#rest-api">Rest API</a> 
+	</strong>
+</p>
+
+## REST API
+
+The following is a quick overview of the available commands.
+
+### Sensors
+
+* [`GET /sensors`]() - Retrieve all sensors information
+* [`GET /sensors/{SensorID}`]() - Retrieve sensor information
+* [`POST /sensors`]() - Create or update a sensor and retrieve `SensorID`
+
+
+### Measurements
+
+* [`GET /measurements`]() - Retrieve all sensors measurements
+* [`GET /measurements/{SensorID}`]() - Retrieve sensor measurements
+* [`POST /measurements`]() - Add measurement (payload needs to include `SensorID`)
+* [`POST /measurements/{SensorID}`]() - Add measurement to sensor
\ No newline at end of file
diff --git a/app/application/application.go b/app/application/application.go
new file mode 100644
index 0000000..c475d11
--- /dev/null
+++ b/app/application/application.go
@@ -0,0 +1,119 @@
+package application
+
+import (
+	"fmt"
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+)
+
+type Mode uint
+
+const (
+	Debug Mode = iota
+	Test
+	Production
+)
+
+type Version struct {
+	Major uint8
+	Minor uint8
+	Patch uint8
+}
+
+type AppError struct {
+	Error string `json:"error"`
+	Debug string `json:"debug"`
+}
+
+type Application struct {
+	version  Version
+	urlRoot  string
+	database *Database
+	engine   *gin.Engine
+	mode     Mode
+}
+
+func (a *Application) SqliteDB(path string) {
+	a.database = &Database{
+		databaseType: SQLite3,
+		path:         path,
+		mode:         a.mode,
+	}
+}
+
+func (a *Application) OpenDB() error {
+	return a.database.open()
+}
+
+func (a *Application) CloseDB() error {
+	return a.database.close()
+}
+
+func (a Application) Db() *gorm.DB {
+	return a.database.db
+}
+
+func (a Application) Version() string {
+	return fmt.Sprintf("%d.%d.%d", a.version.Major, a.version.Minor, a.version.Patch)
+}
+
+func (a Application) VersionNamespace() string {
+	return fmt.Sprintf("%d", a.version.Major)
+}
+
+func (a Application) UrlRoot() string {
+	return a.urlRoot
+}
+
+func (a Application) Engine() *gin.Engine {
+	return a.engine
+}
+
+func (a *Application) Run(address string) error {
+	return a.engine.Run(address)
+}
+
+func (a Application) Database() *Database {
+	return a.database
+}
+
+func (a Application) Mode() Mode {
+	return a.mode
+}
+
+func (a Application) NewError(error string, debug string) interface{} {
+	if a.mode == Debug {
+		return AppError{
+			Error: error,
+			Debug: debug,
+		}
+	} else {
+		return struct {
+			Error string `json:"error"`
+			Debug string `json:"-"`
+		}{error, debug}
+	}
+}
+
+func NewApplication(version Version, urlRoot string, mode Mode) *Application {
+
+	switch mode {
+	case Production:
+		gin.SetMode(gin.ReleaseMode)
+	case Test:
+		gin.SetMode(gin.TestMode)
+	}
+
+	app := Application{
+		version: Version{
+			Major: version.Major,
+			Minor: version.Minor,
+			Patch: version.Patch,
+		},
+		urlRoot: urlRoot,
+		engine:  gin.Default(),
+		mode:    mode,
+	}
+
+	return &app
+}
diff --git a/app/application/database.go b/app/application/database.go
new file mode 100644
index 0000000..6d6f15d
--- /dev/null
+++ b/app/application/database.go
@@ -0,0 +1,52 @@
+package application
+
+import (
+	"errors"
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+type DatabaseType uint8
+
+const (
+	SQL DatabaseType = iota
+	SQLite3
+)
+
+type Database struct {
+	databaseType DatabaseType
+	path         string
+	db           *gorm.DB
+	mode         Mode
+}
+
+func (d *Database) open() error {
+	var err error
+	switch d.databaseType {
+	case SQL:
+		err = errors.New("not yet implemented")
+	case SQLite3:
+		var config gorm.Config
+		if d.mode == Debug {
+			config = gorm.Config{}
+		} else {
+			config = gorm.Config{Logger: logger.Default.LogMode(logger.Silent)}
+		}
+		db, err := gorm.Open(sqlite.Open(d.path), &config)
+		if err == nil {
+			d.db = db
+		}
+	default:
+		err = errors.New("unknown database type")
+	}
+	return err
+}
+
+func (d *Database) close() error {
+	db, err := d.db.DB()
+	if err == nil {
+		err = db.Close()
+	}
+	return err
+}
diff --git a/app/controllers/controller.go b/app/controllers/controller.go
new file mode 100644
index 0000000..f88581c
--- /dev/null
+++ b/app/controllers/controller.go
@@ -0,0 +1,22 @@
+package controllers
+
+import (
+	"gelvin/app/application"
+	"gelvin/app/models"
+)
+
+type Controller struct {
+	app   *application.Application
+	model *models.Model
+}
+
+func (c Controller) Model() *models.Model {
+	return c.model
+}
+
+func NewController(app *application.Application) *Controller {
+	return &Controller{
+		app:   app,
+		model: models.NewModel(app),
+	}
+}
diff --git a/app/controllers/sensor.go b/app/controllers/sensor.go
new file mode 100644
index 0000000..4a067dd
--- /dev/null
+++ b/app/controllers/sensor.go
@@ -0,0 +1,134 @@
+package controllers
+
+import (
+	"errors"
+	"gelvin/app/models"
+	"github.com/gin-gonic/gin"
+	"gorm.io/gorm"
+	"net/http"
+	"strconv"
+)
+
+func (c Controller) GetSensors(ctx *gin.Context) {
+	var sensors []models.Sensor
+	result := c.app.Db().Find(&sensors)
+	if result.Error != nil {
+		ctx.IndentedJSON(http.StatusNotFound, c.app.NewError("sensor not found", result.Error.Error()))
+	} else {
+		ctx.IndentedJSON(http.StatusOK, sensors)
+	}
+}
+
+func (c Controller) GetSensor(ctx *gin.Context) {
+	var sensor models.Sensor
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
+	if err != nil {
+		ctx.IndentedJSON(http.StatusBadRequest, c.app.NewError("invalid input", err.Error()))
+		return
+	}
+	result := c.app.Db().First(&sensor, id)
+	if result.Error != nil {
+		ctx.IndentedJSON(http.StatusNotFound, c.app.NewError("sensor not found", result.Error.Error()))
+	} else {
+		ctx.IndentedJSON(http.StatusOK, sensor)
+	}
+}
+
+func (c Controller) AddSensor(ctx *gin.Context) {
+	var sensor models.Sensor
+	var err = ctx.BindJSON(&sensor)
+	if err == nil && !sensor.IsValid() {
+		err = errors.New("invalid sensor")
+	}
+	var result uint
+	httpCode := http.StatusCreated
+	if err == nil {
+		var txSensor models.Sensor
+		tx := c.app.Db().Where(&models.Sensor{Name: sensor.Name}).First(&txSensor)
+		if tx.Error == nil {
+			result, err = c.model.UpdateSensor(sensor, txSensor, tx)
+			httpCode = http.StatusOK
+		} else {
+			result, err = c.model.AddSensor(sensor)
+		}
+	}
+	if err != nil {
+		ctx.IndentedJSON(http.StatusBadRequest, c.app.NewError("invalid input", err.Error()))
+	} else {
+		id := struct {
+			Id uint `json:"id"`
+		}{result}
+		ctx.IndentedJSON(httpCode, id)
+	}
+}
+
+func (c Controller) GetMeasurements(ctx *gin.Context) {
+	var measurements []models.Measurement
+	//result := c.app.Db().Find(&measurements)
+	// MAX(created_at) converts time.Time to string, `as created_at` or datetime() is not sufficient
+	result := c.app.Db().Select("MAX(created_at)",
+		"id", "created_at", "deleted_at", "sensor_id", "value").Group("sensor_id").Find(&measurements)
+	if result.Error != nil {
+		ctx.IndentedJSON(http.StatusOK, struct{}{})
+	} else {
+		ctx.IndentedJSON(http.StatusOK, measurements)
+	} //result := c.app.Db().Select("id sensor_id MAX(created_at) value").Group("sensor_id").Find(&measurements)
+
+}
+
+func (c Controller) GetMeasurement(ctx *gin.Context) {
+	var measurements []models.Measurement
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
+	if err != nil {
+		ctx.IndentedJSON(http.StatusBadRequest, c.app.NewError("invalid input", err.Error()))
+		return
+	}
+	result := c.app.Db().Where(&models.Measurement{SensorID: uint(id)}).Find(&measurements)
+	if result.Error != nil {
+		ctx.IndentedJSON(http.StatusOK, struct{}{})
+	} else {
+		ctx.IndentedJSON(http.StatusOK, measurements)
+	}
+}
+
+func (c Controller) AddMeasurement(ctx *gin.Context) {
+	var measurement models.Measurement
+	err := ctx.BindJSON(&measurement)
+	if err != nil {
+		ctx.IndentedJSON(http.StatusBadRequest, c.app.NewError("invalid input", err.Error()))
+		return
+	}
+	c.addMeasurement(ctx, measurement)
+}
+
+func (c Controller) AddMeasurementID(ctx *gin.Context) {
+	var measurement models.Measurement
+	id, err := strconv.ParseUint(ctx.Param("id"), 10, 32)
+	if err != nil {
+		ctx.IndentedJSON(http.StatusBadRequest, c.app.NewError("invalid input", err.Error()))
+		return
+	}
+	err = ctx.BindJSON(&measurement)
+	if err != nil {
+		ctx.IndentedJSON(http.StatusBadRequest, c.app.NewError("invalid input", err.Error()))
+		return
+	}
+	measurement.SensorID = uint(id)
+	c.addMeasurement(ctx, measurement)
+}
+
+func (c Controller) addMeasurement(ctx *gin.Context, measurement models.Measurement) {
+	result, err := c.model.AddMeasurement(measurement)
+	if err != nil {
+		if err == gorm.ErrRecordNotFound {
+			ctx.IndentedJSON(http.StatusNotFound, c.app.NewError("sensor not found", err.Error()))
+		} else {
+			ctx.IndentedJSON(http.StatusBadRequest, c.app.NewError("invalid input", err.Error()))
+		}
+	} else {
+		id := struct {
+			Id uint `json:"id"`
+		}{result}
+		ctx.IndentedJSON(http.StatusOK, id)
+	}
+}
diff --git a/app/models/model.go b/app/models/model.go
new file mode 100644
index 0000000..c79cad3
--- /dev/null
+++ b/app/models/model.go
@@ -0,0 +1,19 @@
+package models
+
+import (
+	"gelvin/app/application"
+)
+
+type Model struct {
+	app *application.Application
+}
+
+func NewModel(app *application.Application) *Model {
+	return &Model{
+		app: app,
+	}
+}
+
+func Migrate(app *application.Application) error {
+	return app.Db().AutoMigrate(&Sensor{}, &Measurement{})
+}
diff --git a/app/models/sensor.go b/app/models/sensor.go
new file mode 100644
index 0000000..b673511
--- /dev/null
+++ b/app/models/sensor.go
@@ -0,0 +1,124 @@
+package models
+
+import (
+	"database/sql/driver"
+	"errors"
+	"gorm.io/gorm"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type SensorType uint
+
+const (
+	Temperature SensorType = iota + 1 // to allow gorm: not null
+	Humidity
+	Pressure
+	Gas
+	CO2
+)
+
+func (s SensorType) IsValid() bool {
+	switch s {
+	case Temperature, Humidity, Pressure, Gas, CO2:
+		return true
+	default:
+		return false
+	}
+}
+
+type Position struct {
+	X       int  `json:"x"`
+	Y       int  `json:"y"`
+	NotNull bool `json:"-"` // to allow gorm: not null with x/y = 0
+}
+
+type Sensor struct {
+	ID         uint           `json:"id" gorm:"primaryKey"`
+	CreatedAt  time.Time      `json:"-"`
+	UpdatedAt  time.Time      `json:"-"`
+	DeletedAt  gorm.DeletedAt `json:"-" gorm:"index"`
+	Name       string         `json:"name" gorm:"uniqueIndex;not null;default:null"`
+	SensorType SensorType     `json:"sensor_type" gorm:"not null;default:null"`
+	Position   Position       `json:"position" gorm:"not null;default:null"`
+}
+
+type Measurement struct {
+	ID        uint           `json:"id" gorm:"primaryKey"`
+	CreatedAt time.Time      `json:"time"`           // TODO: change to datetime2
+	UpdatedAt time.Time      `json:"-"`              // TODO: remove
+	DeletedAt gorm.DeletedAt `json:"-" gorm:"index"` // TODO: remove
+	SensorID  uint           `json:"sensor_id" gorm:"<-:create;not null;default:null"`
+	Sensor    Sensor         `json:"-"`
+	Value     float64        `json:"value" gorm:"<-:create;default:null"` // TODO on migrate set column NOT NULL
+}
+
+func (s Sensor) IsValid() bool {
+	return s.SensorType.IsValid()
+}
+
+func (p Position) Value() (driver.Value, error) {
+	return strconv.FormatInt(int64(p.X), 10) + "." + strconv.FormatInt(int64(p.Y), 10), nil
+}
+
+func (p *Position) Scan(value interface{}) error {
+	p.X = 0
+	p.Y = 0
+	p.NotNull = true
+	positionString, isString := value.(string)
+	if !isString {
+		return errors.New("invalid scan value")
+	}
+	positionArray := strings.Split(positionString, ".")
+	if len(positionArray) != 2 {
+		return errors.New("invalid string value")
+	}
+	var err error
+	var position int64
+	position, err = strconv.ParseInt(positionArray[0], 10, 32)
+	if err != nil {
+		return errors.New("invalid x value")
+	}
+	p.X = int(position)
+	position, err = strconv.ParseInt(positionArray[1], 10, 32)
+	if err != nil {
+		return errors.New("invalid y value")
+	}
+	p.Y = int(position)
+	return nil
+}
+
+// http -v POST localhost:8080/sensors name="sensor_$RANDOM" sensor_type:=1 position:='{"x":1, "y":2}'
+// http -v POST localhost:8080/sensors name="sensor_$RANDOM" sensor_type:=2
+func (m Model) AddSensor(sensor Sensor) (uint, error) {
+	sensor.ID = 0
+	sensor.Position.NotNull = true
+	if !sensor.SensorType.IsValid() {
+		return 0, errors.New("invalid sensor type")
+	}
+	result := m.app.Db().Create(&sensor)
+	return sensor.ID, result.Error
+}
+
+func (m Model) UpdateSensor(sensor Sensor, txSensor Sensor, tx *gorm.DB) (uint, error) {
+	sensor.ID = txSensor.ID
+	sensor.Position.NotNull = true
+	if !sensor.SensorType.IsValid() {
+		return 0, errors.New("invalid sensor type")
+	}
+	result := tx.Updates(&sensor)
+	return sensor.ID, result.Error
+}
+
+// http -v POST localhost:8080/measurements sensor_id:=3 value:=32
+// http -v GET localhost:8080/measurements/3
+func (m Model) AddMeasurement(measurement Measurement) (uint, error) {
+	measurement.ID = 0
+	err := m.app.Db().First(&Sensor{}, measurement.SensorID).Error
+	if err != nil {
+		return 0, err
+	}
+	result := m.app.Db().Create(&measurement)
+	return measurement.ID, result.Error
+}
diff --git a/config/app.go b/config/app.go
new file mode 100644
index 0000000..4b6f332
--- /dev/null
+++ b/config/app.go
@@ -0,0 +1,8 @@
+package config
+
+import "gelvin/app/application"
+
+func configureApp() *application.Application {
+	app := application.NewApplication(Environment().Version, Environment().UrlRoot, Environment().Mode)
+	return app
+}
diff --git a/config/config.go b/config/config.go
new file mode 100644
index 0000000..277a8cb
--- /dev/null
+++ b/config/config.go
@@ -0,0 +1,33 @@
+package config
+
+import (
+	"gelvin/app/application"
+	"gelvin/app/controllers"
+	"gelvin/app/models"
+)
+
+type Config struct {
+	app        *application.Application
+	controller *controllers.Controller
+	model      *models.Model
+}
+
+func (c Config) App() *application.Application {
+	return c.app
+}
+
+func (c Config) Controller() *controllers.Controller {
+	return c.controller
+}
+
+func (c Config) Model() *models.Model {
+	return c.model
+}
+
+func Configure() *Config {
+	app := configureApp()
+	controller := controllers.NewController(app)
+	configureDb(app)
+	configureRoutes(app, controller)
+	return &Config{app, controller, controller.Model()}
+}
diff --git a/config/database.go b/config/database.go
new file mode 100644
index 0000000..78d6025
--- /dev/null
+++ b/config/database.go
@@ -0,0 +1,9 @@
+package config
+
+import (
+	"gelvin/app/application"
+)
+
+func configureDb(app *application.Application) {
+	app.SqliteDB("./db")
+}
diff --git a/config/environment.go b/config/environment.go
new file mode 100644
index 0000000..0408934
--- /dev/null
+++ b/config/environment.go
@@ -0,0 +1,51 @@
+package config
+
+import (
+	"gelvin/app/application"
+	"os"
+)
+
+const EnvPrefix = "GELVIN_"
+
+type environment struct {
+	Mode    application.Mode
+	UrlRoot string
+	Version application.Version
+}
+
+func Environment() environment {
+
+	var mode application.Mode
+	switch getEnv("MODE") {
+	case "TEST":
+		mode = application.Test
+	case "PRODUCTION":
+		mode = application.Production
+	default:
+		mode = application.Debug
+	}
+
+	var urlRoot string
+	if urlRoot = getEnv("URL_ROOT"); urlRoot == "" {
+		urlRoot = "/"
+	}
+
+	version := parseVersion(getEnv("API_VERSION"))
+	return environment{
+		Mode:    mode,
+		UrlRoot: urlRoot,
+		Version: version,
+	}
+}
+
+func getEnv(key string) string {
+	return os.Getenv(EnvPrefix + key)
+}
+
+func parseVersion(s string) application.Version {
+	version := application.Version{Major: 1}
+	if s != "" {
+		// TODO
+	}
+	return version
+}
diff --git a/config/routes.go b/config/routes.go
new file mode 100644
index 0000000..d32bb33
--- /dev/null
+++ b/config/routes.go
@@ -0,0 +1,30 @@
+package config
+
+import (
+	"gelvin/app/application"
+	"gelvin/app/controllers"
+	"github.com/gin-contrib/cors"
+)
+
+func configureRoutes(app *application.Application, controller *controllers.Controller) {
+	root := app.UrlRoot()
+	router := app.Engine()
+	corsConfig := cors.DefaultConfig()
+
+	// cors
+	corsConfig.AllowOrigins = []string{
+		"http://localhost:8080",
+	}
+	router.Use(cors.New(corsConfig))
+
+	// sensors
+	router.GET(root+"sensors", controller.GetSensors)
+	router.GET(root+"sensors/:id", controller.GetSensor)
+	router.POST(root+"sensors", controller.AddSensor)
+
+	// measurements
+	router.GET(root+"measurements", controller.GetMeasurements)
+	router.GET(root+"measurements/:id", controller.GetMeasurement)
+	router.POST(root+"measurements", controller.AddMeasurement)
+	router.POST(root+"measurements/:id", controller.AddMeasurementID)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..6954d87
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,30 @@
+module gelvin
+
+go 1.17
+
+require github.com/gin-gonic/gin v1.7.4
+
+require (
+	github.com/gin-contrib/cors v1.3.1 // indirect
+	github.com/gin-contrib/sse v0.1.0 // indirect
+	github.com/go-playground/locales v0.14.0 // indirect
+	github.com/go-playground/universal-translator v0.18.0 // indirect
+	github.com/go-playground/validator/v10 v10.9.0 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/jinzhu/inflection v1.0.0 // indirect
+	github.com/jinzhu/now v1.1.2 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/leodido/go-urn v1.2.1 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/mattn/go-sqlite3 v1.14.9 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
+	github.com/ugorji/go/codec v1.2.6 // indirect
+	golang.org/x/crypto v0.0.0-20211108221036-ceb1ce70b4fa // indirect
+	golang.org/x/sys v0.0.0-20211113001501-0c823b97ae02 // indirect
+	golang.org/x/text v0.3.7 // indirect
+	google.golang.org/protobuf v1.26.0 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gorm.io/driver/sqlite v1.2.4 // indirect
+	gorm.io/gorm v1.22.3 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..c55b057
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,131 @@
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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diff --git a/main.go b/main.go
new file mode 100644
index 0000000..909548c
--- /dev/null
+++ b/main.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+	"fmt"
+	"gelvin/app/models"
+	"gelvin/config"
+	"gorm.io/gorm"
+	"os"
+	"time"
+)
+
+func main() {
+	address := "0.0.0.0:8081"
+	if len(os.Args) > 1 {
+		address = os.Args[1]
+	}
+	config := config.Configure()
+	config.App().OpenDB()
+	defer config.App().CloseDB()
+	fmt.Println("Migration:", models.Migrate(config.App()))
+	config.Model().AddSensor(models.Sensor{
+		ID:         0,
+		CreatedAt:  time.Time{},
+		UpdatedAt:  time.Time{},
+		DeletedAt:  gorm.DeletedAt{},
+		Name:       "asd",
+		SensorType: 4,
+		Position:   models.Position{},
+	})
+	fmt.Println(config.App().Run(address))
+}