.gitignore

@@ -0,0 +1,26 @@
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+users/
+
+.vscode/
+*.swp

app/repository/interfaces.go

@@ -0,0 +1,12 @@
+package repository
+
+import "owl-blogs/domain/model"
+
+type EntryRepository interface {
+	RegisterEntryType(entry model.Entry) error
+	Create(entry model.Entry) error
+	Update(entry model.Entry) error
+	Delete(entry model.Entry) error
+	FindById(id string) (model.Entry, error)
+	FindAll(types *[]string) ([]model.Entry, error)
+}

domain/model/entry.go

@@ -0,0 +1,16 @@
+package model
+
+import "time"
+
+type EntryContent string
+
+type Entry interface {
+	ID() string
+	Content() EntryContent
+	PublishedAt() *time.Time
+	MetaData() interface{}
+	Create(id string, content string, publishedAt *time.Time, metaData EntryMetaData) error
+}
+
+type EntryMetaData interface {
+}

domain/model/image_entry.go

@@ -0,0 +1,40 @@
+package model
+
+import "time"
+
+type ImageEntry struct {
+	id          string
+	content     EntryContent
+	publishedAt *time.Time
+	ImagePath   string
+}
+
+type ImageEntryMetaData struct {
+	ImagePath string
+}
+
+func (e *ImageEntry) ID() string {
+	return e.id
+}
+
+func (e *ImageEntry) Content() EntryContent {
+	return e.content
+}
+
+func (e *ImageEntry) PublishedAt() *time.Time {
+	return e.publishedAt
+}
+
+func (e *ImageEntry) MetaData() interface{} {
+	return &ImageEntryMetaData{
+		ImagePath: e.ImagePath,
+	}
+}
+
+func (e *ImageEntry) Create(id string, content string, publishedAt *time.Time, metaData EntryMetaData) error {
+	e.id = id
+	e.content = EntryContent(content)
+	e.publishedAt = publishedAt
+	e.ImagePath = metaData.(*ImageEntryMetaData).ImagePath
+	return nil
+}

go.mod

@@ -0,0 +1,13 @@
+module owl-blogs
+
+go 1.20
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/jmoiron/sqlx v1.3.5 // indirect
+	github.com/mattn/go-sqlite3 v1.14.17 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/objx v0.5.0 // indirect
+	github.com/stretchr/testify v1.8.4 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)

go.sum

@@ -0,0 +1,24 @@
+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=
+github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LBy8hT2VhHyBg=
+github.com/jmoiron/sqlx v1.3.5 h1:vFFPA71p1o5gAeqtEAwLU4dnX2napprKtHr7PYIcN3g=
+github.com/jmoiron/sqlx v1.3.5/go.mod h1:nRVWtLre0KfCLJvgxzCsLVMogSvQ1zNJtpYr2Ccp0mQ=
+github.com/lib/pq v1.2.0/go.mod h1:5WUZQaWbwv1U+lTReE5YruASi9Al49XbQIvNi/34Woo=
+github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
+github.com/mattn/go-sqlite3 v1.14.17 h1:mCRHCLDUBXgpKAqIKsaAaAsrAlbkeomtRFKXh2L6YIM=
+github.com/mattn/go-sqlite3 v1.14.17/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
+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/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/objx v0.5.0 h1:1zr/of2m5FGMsad5YfcqgdqdWrIhu+EBEJRhR1U7z/c=
+github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/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=

infra/entry_repository.go

@@ -0,0 +1,168 @@
+package infra
+
+import (
+	"encoding/json"
+	"errors"
+	"owl-blogs/app/repository"
+	"owl-blogs/domain/model"
+	"reflect"
+	"strings"
+	"time"
+
+	"github.com/jmoiron/sqlx"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+type sqlEntry struct {
+	Id          string     `db:"id"`
+	Type        string     `db:"type"`
+	Content     string     `db:"content"`
+	PublishedAt *time.Time `db:"published_at"`
+	MetaData    *string    `db:"meta_data"`
+}
+
+type DefaultEntryRepo struct {
+	types map[string]model.Entry
+	db    *sqlx.DB
+}
+
+// Create implements repository.EntryRepository.
+func (r *DefaultEntryRepo) Create(entry model.Entry) error {
+	exEntry, _ := r.FindById(entry.ID())
+	if exEntry != nil {
+		return errors.New("entry already exists")
+	}
+
+	t := r.entryType(entry)
+	if _, ok := r.types[t]; !ok {
+		return errors.New("entry type not registered")
+	}
+
+	var metaDataJson []byte
+	if entry.MetaData() != nil {
+		metaDataJson, _ = json.Marshal(entry.MetaData())
+	}
+
+	_, err := r.db.Exec("INSERT INTO entries (id, type, content, published_at, meta_data) VALUES (?, ?, ?, ?, ?)", entry.ID(), t, entry.Content(), entry.PublishedAt(), metaDataJson)
+	return err
+}
+
+// Delete implements repository.EntryRepository.
+func (r *DefaultEntryRepo) Delete(entry model.Entry) error {
+	_, err := r.db.Exec("DELETE FROM entries WHERE id = ?", entry.ID())
+	return err
+}
+
+// FindAll implements repository.EntryRepository.
+func (r *DefaultEntryRepo) FindAll(types *[]string) ([]model.Entry, error) {
+	filterStr := ""
+	if types != nil {
+		filters := []string{}
+		for _, t := range *types {
+			filters = append(filters, "type = '"+t+"'")
+		}
+		filterStr = strings.Join(filters, " OR ")
+	}
+
+	var entries []sqlEntry
+	if filterStr != "" {
+		err := r.db.Select(&entries, "SELECT * FROM entries WHERE "+filterStr)
+		if err != nil {
+			return nil, err
+		}
+	} else {
+		err := r.db.Select(&entries, "SELECT * FROM entries")
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	result := []model.Entry{}
+	for _, entry := range entries {
+		e, err := r.sqlEntryToEntry(entry)
+		if err != nil {
+			return nil, err
+		}
+		result = append(result, e)
+	}
+	return result, nil
+}
+
+// FindById implements repository.EntryRepository.
+func (r *DefaultEntryRepo) FindById(id string) (model.Entry, error) {
+	data := sqlEntry{}
+	err := r.db.Get(&data, "SELECT * FROM entries WHERE id = ?", id)
+	if err != nil {
+		return nil, err
+	}
+	if data.Id == "" {
+		return nil, nil
+	}
+	return r.sqlEntryToEntry(data)
+}
+
+// RegisterEntryType implements repository.EntryRepository.
+func (r *DefaultEntryRepo) RegisterEntryType(entry model.Entry) error {
+	t := r.entryType(entry)
+	if _, ok := r.types[t]; ok {
+		return errors.New("entry type already registered")
+	}
+	r.types[t] = entry
+	return nil
+}
+
+// Update implements repository.EntryRepository.
+func (r *DefaultEntryRepo) Update(entry model.Entry) error {
+	exEntry, _ := r.FindById(entry.ID())
+	if exEntry == nil {
+		return errors.New("entry not found")
+	}
+
+	t := r.entryType(entry)
+	if _, ok := r.types[t]; !ok {
+		return errors.New("entry type not registered")
+	}
+
+	var metaDataJson []byte
+	if entry.MetaData() != nil {
+		metaDataJson, _ = json.Marshal(entry.MetaData())
+	}
+
+	_, err := r.db.Exec("UPDATE entries SET content = ?, published_at = ?, meta_data = ? WHERE id = ?", entry.Content(), entry.PublishedAt(), metaDataJson, entry.ID())
+	return err
+}
+
+func NewEntryRepository(db Database) repository.EntryRepository {
+	sqlxdb := db.Get()
+
+	// Create tables if not exists
+	sqlxdb.MustExec(`
+		CREATE TABLE IF NOT EXISTS entries (
+			id TEXT PRIMARY KEY,
+			type TEXT NOT NULL,
+			content TEXT NOT NULL,
+			published_at DATETIME,
+			meta_data TEXT NOT NULL
+		);
+	`)
+
+	return &DefaultEntryRepo{
+		types: map[string]model.Entry{},
+		db:    sqlxdb,
+	}
+}
+
+func (r *DefaultEntryRepo) entryType(entry model.Entry) string {
+	return reflect.TypeOf(entry).Elem().Name()
+}
+
+func (r *DefaultEntryRepo) sqlEntryToEntry(entry sqlEntry) (model.Entry, error) {
+	e, ok := r.types[entry.Type]
+	if !ok {
+		return nil, errors.New("entry type not registered")
+	}
+	metaData := reflect.New(reflect.TypeOf(e.MetaData()).Elem()).Interface()
+	json.Unmarshal([]byte(*entry.MetaData), metaData)
+	e.Create(entry.Id, entry.Content, entry.PublishedAt, metaData)
+	return e, nil
+}

infra/entry_repository_test.go

@@ -0,0 +1,144 @@
+package infra_test
+
+import (
+	"owl-blogs/app/repository"
+	"owl-blogs/infra"
+	"owl-blogs/test"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+)
+
+func setupRepo() repository.EntryRepository {
+	db := test.NewMockDb()
+	repo := infra.NewEntryRepository(db)
+	repo.RegisterEntryType(&test.MockEntry{})
+	return repo
+}
+
+func TestRepoRegister(t *testing.T) {
+	db := test.NewMockDb()
+	repo := infra.NewEntryRepository(db)
+	err := repo.RegisterEntryType(&test.MockEntry{})
+	require.NoError(t, err)
+
+	err = repo.RegisterEntryType(&test.MockEntry{})
+	require.Error(t, err)
+}
+
+func TestRepoCreate(t *testing.T) {
+	repo := setupRepo()
+
+	entry := &test.MockEntry{}
+	now := time.Now()
+	entry.Create("id", "content", &now, &test.MockEntryMetaData{
+		Str:    "str",
+		Number: 1,
+		Date:   now,
+	})
+	err := repo.Create(entry)
+	require.NoError(t, err)
+
+	entry2, err := repo.FindById("id")
+	require.NoError(t, err)
+	require.Equal(t, entry.ID(), entry2.ID())
+	require.Equal(t, entry.Content(), entry2.Content())
+	require.Equal(t, entry.PublishedAt().Unix(), entry2.PublishedAt().Unix())
+	meta := entry.MetaData().(*test.MockEntryMetaData)
+	meta2 := entry2.MetaData().(*test.MockEntryMetaData)
+	require.Equal(t, meta.Str, meta2.Str)
+	require.Equal(t, meta.Number, meta2.Number)
+	require.Equal(t, meta.Date.Unix(), meta2.Date.Unix())
+}
+
+func TestRepoDelete(t *testing.T) {
+	repo := setupRepo()
+
+	entry := &test.MockEntry{}
+	now := time.Now()
+	entry.Create("id", "content", &now, &test.MockEntryMetaData{
+		Str:    "str",
+		Number: 1,
+		Date:   now,
+	})
+	err := repo.Create(entry)
+	require.NoError(t, err)
+
+	err = repo.Delete(entry)
+	require.NoError(t, err)
+
+	_, err = repo.FindById("id")
+	require.Error(t, err)
+}
+
+func TestRepoFindAll(t *testing.T) {
+	repo := setupRepo()
+
+	entry := &test.MockEntry{}
+	now := time.Now()
+	entry.Create("id", "content", &now, &test.MockEntryMetaData{
+		Str:    "str",
+		Number: 1,
+		Date:   now,
+	})
+	err := repo.Create(entry)
+	require.NoError(t, err)
+
+	entry2 := &test.MockEntry{}
+	now2 := time.Now()
+	entry2.Create("id2", "content2", &now2, &test.MockEntryMetaData{
+		Str:    "str2",
+		Number: 2,
+		Date:   now2,
+	})
+	err = repo.Create(entry2)
+	require.NoError(t, err)
+
+	entries, err := repo.FindAll(nil)
+	require.NoError(t, err)
+	require.Equal(t, 2, len(entries))
+
+	entries, err = repo.FindAll(&[]string{"MockEntry"})
+	require.NoError(t, err)
+	require.Equal(t, 2, len(entries))
+
+	entries, err = repo.FindAll(&[]string{"MockEntry2"})
+	require.NoError(t, err)
+	require.Equal(t, 0, len(entries))
+
+}
+
+func TestRepoUpdate(t *testing.T) {
+	repo := setupRepo()
+
+	entry := &test.MockEntry{}
+	now := time.Now()
+	entry.Create("id", "content", &now, &test.MockEntryMetaData{
+		Str:    "str",
+		Number: 1,
+		Date:   now,
+	})
+	err := repo.Create(entry)
+	require.NoError(t, err)
+
+	entry2 := &test.MockEntry{}
+	now2 := time.Now()
+	entry2.Create("id", "content2", &now2, &test.MockEntryMetaData{
+		Str:    "str2",
+		Number: 2,
+		Date:   now2,
+	})
+	err = repo.Update(entry2)
+	require.NoError(t, err)
+
+	entry3, err := repo.FindById("id")
+	require.NoError(t, err)
+	require.Equal(t, entry3.Content(), entry2.Content())
+	require.Equal(t, entry3.PublishedAt().Unix(), entry2.PublishedAt().Unix())
+	meta := entry3.MetaData().(*test.MockEntryMetaData)
+	meta2 := entry2.MetaData().(*test.MockEntryMetaData)
+	require.Equal(t, meta.Str, meta2.Str)
+	require.Equal(t, meta.Number, meta2.Number)
+	require.Equal(t, meta.Date.Unix(), meta2.Date.Unix())
+}

infra/interface.go

@@ -0,0 +1,7 @@
+package infra
+
+import "github.com/jmoiron/sqlx"
+
+type Database interface {
+	Get() *sqlx.DB
+}

main.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+	"owl-blogs/domain/model"
+	"reflect"
+)
+
+func Persist(entry model.Entry) error {
+	t := reflect.TypeOf(entry).Elem().Name()
+
+	fmt.Println(t)
+	return nil
+}
+
+func main() {
+	// repo := infra.NewEntryRepository()
+	// repo.RegisterEntryType(&model.ImageEntry{})
+
+	// var img model.Entry = &model.ImageEntry{}
+	// img.Create("id", "content", nil, &model.ImageEntryMetaData{ImagePath: "path"})
+
+	// repo.Save(img)
+
+	// img2, err := repo.FindById("id")
+	// if err != nil {
+	// 	panic(err)
+	// }
+	// fmt.Println(img2)
+}

test/mock_db.go

@@ -0,0 +1,19 @@
+package test
+
+import (
+	"github.com/jmoiron/sqlx"
+	_ "github.com/mattn/go-sqlite3"
+)
+
+type MockDb struct {
+	db *sqlx.DB
+}
+
+func (d *MockDb) Get() *sqlx.DB {
+	return d.db
+}
+
+func NewMockDb() *MockDb {
+	db := sqlx.MustOpen("sqlite3", ":memory:")
+	return &MockDb{db: db}
+}

test/mock_entry.go

@@ -0,0 +1,43 @@
+package test
+
+import (
+	"owl-blogs/domain/model"
+	"time"
+)
+
+type MockEntryMetaData struct {
+	Str    string
+	Number int
+	Date   time.Time
+}
+
+type MockEntry struct {
+	id          string
+	content     model.EntryContent
+	publishedAt *time.Time
+	metaData    *MockEntryMetaData
+}
+
+func (e *MockEntry) ID() string {
+	return e.id
+}
+
+func (e *MockEntry) Content() model.EntryContent {
+	return e.content
+}
+
+func (e *MockEntry) PublishedAt() *time.Time {
+	return e.publishedAt
+}
+
+func (e *MockEntry) MetaData() interface{} {
+	return e.metaData
+}
+
+func (e *MockEntry) Create(id string, content string, publishedAt *time.Time, metaData model.EntryMetaData) error {
+	e.id = id
+	e.content = model.EntryContent(content)
+	e.publishedAt = publishedAt
+	e.metaData = metaData.(*MockEntryMetaData)
+	return nil
+}