basic setup for backend

backend/cmd/threadule/main.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"threadule/backend/internal/app"
+	"threadule/backend/internal/config"
+	"threadule/backend/internal/data"
+	"threadule/backend/internal/logic"
+	router "threadule/backend/internal/router"
+	"threadule/backend/internal/web"
+)
+
+var configFile = flag.String("c", "config.toml", "path to config file (will be autogenerated if it doesn't yet exist)")
+
+func main() {
+	flag.Parse()
+
+	cfg, err := config.Read(*configFile)
+	if err != nil {
+		fmt.Println("reading config file failed")
+		fmt.Println(err)
+		return
+	}
+
+	ctx := &app.Context{
+		Config: cfg,
+	}
+
+	ctx.Logic, err = logic.Setup(ctx)
+	if err != nil {
+		fmt.Println("couldn't setup logic layer")
+		fmt.Println(err)
+		return
+	}
+
+	ctx.Data, err = data.Setup(ctx)
+	if err != nil {
+		fmt.Println("couldn't setup persistence layer")
+		fmt.Println(err)
+		return
+	}
+
+	handler := router.Setup(ctx)
+	err = web.StartServer(ctx, handler)
+	if err != nil {
+		fmt.Println("couldn't start web server")
+		fmt.Println(err)
+		return
+	}
+}

backend/go.mod

@@ -0,0 +1,10 @@
+module threadule/backend
+
+go 1.16
+
+require (
+	github.com/julienschmidt/httprouter v1.3.0
+	github.com/pelletier/go-toml/v2 v2.0.0-beta.3
+	gorm.io/driver/mysql v1.1.2
+	gorm.io/gorm v1.21.13
+)

backend/go.sum

@@ -0,0 +1,25 @@
+github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-sql-driver/mysql v1.6.0 h1:BCTh4TKNUYmOmMUcQ3IipzF5prigylS7XXjEkfCHuOE=
+github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
+github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
+github.com/jinzhu/now v1.1.2 h1:eVKgfIdy9b6zbWBMgFpfDPoAMifwSZagU9HmEU6zgiI=
+github.com/jinzhu/now v1.1.2/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
+github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4dN7jwJOQ1U=
+github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
+github.com/pelletier/go-toml/v2 v2.0.0-beta.3 h1:PNCTU4naEJ8mKal97P3A2qDU74QRQGlv4FXiL1XDqi4=
+github.com/pelletier/go-toml/v2 v2.0.0-beta.3/go.mod h1:aNseLYu/uKskg0zpr/kbr2z8yGuWtotWf/0BpGIAL2Y=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.7.1-0.20210427113832-6241f9ab9942 h1:t0lM6y/M5IiUZyvbBTcngso8SZEZICH7is9B6g/obVU=
+github.com/stretchr/testify v1.7.1-0.20210427113832-6241f9ab9942/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gorm.io/driver/mysql v1.1.2 h1:OofcyE2lga734MxwcCW9uB4mWNXMr50uaGRVwQL2B0M=
+gorm.io/driver/mysql v1.1.2/go.mod h1:4P/X9vSc3WTrhTLZ259cpFd6xKNYiSSdSZngkSBGIMM=
+gorm.io/gorm v1.21.12/go.mod h1:F+OptMscr0P2F2qU97WT1WimdH9GaQPoDW7AYd5i2Y0=
+gorm.io/gorm v1.21.13 h1:JU5A4yVemRjdMndJ0oZU7VX+Nr2ICE3C60U5bgR6mHE=
+gorm.io/gorm v1.21.13/go.mod h1:F+OptMscr0P2F2qU97WT1WimdH9GaQPoDW7AYd5i2Y0=

backend/internal/app/context.go

@@ -0,0 +1,9 @@
+package app
+
+import "threadule/backend/internal/config"
+
+type Context struct {
+	Config *config.Config
+	Logic  Logic
+	Data   Data
+}

backend/internal/app/data.go

@@ -0,0 +1,4 @@
+package app
+
+type Data interface {
+}

backend/internal/app/logic.go

@@ -0,0 +1,4 @@
+package app
+
+type Logic interface {
+}

backend/internal/config/config.go

@@ -0,0 +1,44 @@
+package config
+
+import (
+	"fmt"
+	"github.com/pelletier/go-toml/v2"
+	"io/fs"
+	"os"
+)
+
+type database struct {
+	DSN string
+}
+
+type Config struct {
+	Port     uint
+	Database database
+}
+
+func writeDefaultConfig(path string) error {
+	content, err := toml.Marshal(&Config{
+		Port:     8080,
+		Database: database{DSN: ""},
+	})
+	if err != nil {
+		return fmt.Errorf("couldn't generate default config: %w", err)
+	}
+
+	return os.WriteFile(path, content, fs.FileMode(0640))
+}
+
+func Read(path string) (*Config, error) {
+	content, err := os.ReadFile(path)
+	if err != nil {
+		return nil, writeDefaultConfig(path)
+	}
+
+	var config Config
+	err = toml.Unmarshal(content, &config)
+	if err != nil {
+		return nil, err
+	}
+
+	return &config, nil
+}

backend/internal/data/data.go

@@ -0,0 +1,31 @@
+package data
+
+import (
+	"fmt"
+	"gorm.io/gorm"
+	"threadule/backend/internal/app"
+)
+
+type Data struct {
+	ctx *app.Context
+	db  *gorm.DB
+}
+
+var _ app.Data = &Data{}
+
+func Setup(ctx *app.Context) (app.Data, error) {
+	db, err := connect(ctx.Config.Database.DSN)
+	if err != nil {
+		return nil, fmt.Errorf("failed to connect to database: %w", err)
+	}
+
+	err = migrate(db)
+	if err != nil {
+		return nil, fmt.Errorf("failed to migrate models: %w", err)
+	}
+
+	return &Data{
+		ctx: ctx,
+		db:  db,
+	}, nil
+}

backend/internal/data/gorm.go

@@ -0,0 +1,31 @@
+package data
+
+import (
+	"errors"
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+	"strings"
+)
+
+func connect(dsn string) (*gorm.DB, error) {
+	return gorm.Open(mysql.Open(dsn), &gorm.Config{})
+}
+
+func migrate(db *gorm.DB) error {
+	var errs []error
+
+	//errs = append(errs, db.AutoMigrate())
+
+	errorBuilder := strings.Builder{}
+	for _, err := range errs {
+		if err != nil {
+			errorBuilder.WriteString(err.Error())
+			errorBuilder.WriteString("\n")
+		}
+	}
+	if errorBuilder.Len() == 0 {
+		return nil
+	} else {
+		return errors.New(strings.TrimSpace(errorBuilder.String()))
+	}
+}

backend/internal/logic/logic.go

@@ -0,0 +1,15 @@
+package logic
+
+import "threadule/backend/internal/app"
+
+type Logic struct {
+	ctx *app.Context
+}
+
+var _ app.Logic = &Logic{}
+
+func Setup(ctx *app.Context) (app.Logic, error) {
+	return &Logic{
+		ctx: ctx,
+	}, nil
+}

backend/internal/presentation/test.go

@@ -0,0 +1,7 @@
+package presentation
+
+import "threadule/backend/internal/web"
+
+func Test(ctx *web.Context) {
+
+}

backend/internal/router/router.go

@@ -0,0 +1,44 @@
+package router
+
+import (
+	"github.com/julienschmidt/httprouter"
+	"net/http"
+	"threadule/backend/internal/app"
+	"threadule/backend/internal/web"
+)
+
+func ctxWrapper(appCtx *app.Context, handler web.Handler) httprouter.Handle {
+	return func(writer http.ResponseWriter, request *http.Request, params httprouter.Params) {
+		handler(&web.Context{
+			Response: writer,
+			Request:  request,
+			Params:   params,
+			AppCtx:   appCtx,
+		})
+	}
+}
+
+type router struct {
+	*httprouter.Router
+	appCtx *app.Context
+}
+
+func (r *router) GET(path string, handler web.Handler) {
+	r.Router.GET(path, ctxWrapper(r.appCtx, handler))
+}
+
+func (r *router) POST(path string, handler web.Handler) {
+	r.Router.POST(path, ctxWrapper(r.appCtx, handler))
+}
+
+func (r *router) OPTIONS(path string, handler web.Handler) {
+	r.Router.OPTIONS(path, ctxWrapper(r.appCtx, handler))
+}
+
+func (r *router) HEAD(path string, handler web.Handler) {
+	r.Router.HEAD(path, ctxWrapper(r.appCtx, handler))
+}
+
+func (r *router) DELETE(path string, handler web.Handler) {
+	r.Router.DELETE(path, ctxWrapper(r.appCtx, handler))
+}

backend/internal/router/routes.go

@@ -0,0 +1,16 @@
+package router
+
+import (
+	"github.com/julienschmidt/httprouter"
+	"net/http"
+	"threadule/backend/internal/app"
+	"threadule/backend/internal/presentation"
+)
+
+func Setup(ctx *app.Context) http.Handler {
+	router := &router{Router: httprouter.New(), appCtx: ctx}
+
+	router.GET("/", presentation.Test)
+
+	return router
+}

backend/internal/web/context.go

@@ -0,0 +1,14 @@
+package web
+
+import (
+	"github.com/julienschmidt/httprouter"
+	"net/http"
+	"threadule/backend/internal/app"
+)
+
+type Context struct {
+	Response http.ResponseWriter
+	Request  *http.Request
+	Params   httprouter.Params
+	AppCtx   *app.Context
+}

backend/internal/web/handler.go

@@ -0,0 +1,3 @@
+package web
+
+type Handler func(ctx *Context)

backend/internal/web/server.go

@@ -0,0 +1,11 @@
+package web
+
+import (
+	"fmt"
+	"net/http"
+	"threadule/backend/internal/app"
+)
+
+func StartServer(ctx *app.Context, handler http.Handler) error {
+	return http.ListenAndServe(fmt.Sprintf("0.0.0.0:%d", ctx.Config.Port), handler)
+}