Stop using Gorm, add persistence layer components and new mechanic of…

… domain event publishing

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Duy Phung
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

docker-compose.yml

@@ -0,0 +1,11 @@
+version: '3.8'
+services:
+  db:
+    image: postgres:14.1-alpine
+    container_name: postgresdb
+    restart: always
+    environment:
+      - POSTGRES_USER=postgres
+      - POSTGRES_PASSWORD=postgres
+    ports:
+      - '54320:5432'

domain/entity/base_entity.go

@@ -1,9 +1,21 @@
 package entity
 
+import (
+	"time"
+
+	"github.com/tonybka/go-base-ddd/domain/event"
+)
+
 type BaseEntity struct {
-	ID uint
+	ID        uint
+	CreatedAt time.Time
+	UpdatedAt time.Time
 }
 
 func NewBaseEntity(id uint) BaseEntity {
-	return BaseEntity{ID: id}
+	return BaseEntity{ID: id, CreatedAt: time.Now()}
+}
+
+func (base *BaseEntity) AddEvent(tableName string, domainEvent event.IBaseDomainEvent) {
+	event.EventSource.AddEvent(tableName, domainEvent)
 }

domain/event/base_domain_event.go

@@ -1,10 +1,72 @@
 package event
 
-import "time"
+import (
+	"encoding/json"
+	"time"
+
+	"github.com/google/uuid"
+)
 
 type IBaseDomainEvent interface {
+	ID() uuid.UUID
+	AggregateID() uint
+	Aggregate() string
 	Name() string
 	ToJson() (string, error)
-	ID() string
 	OccurredAt() time.Time
+	Data() interface{}
+}
+
+type domainEventProps struct {
+	ID          uuid.UUID
+	AggregateID uint
+	Aggregate   string
+	Name        string
+	OccuredAt   time.Time
+	Data        interface{}
+}
+
+type BaseDomainEvent struct {
+	props domainEventProps
+}
+
+func NewBaseDomainEvent(aggregate string, aggregateID uint, name string, data interface{}) *BaseDomainEvent {
+	return &BaseDomainEvent{
+		props: domainEventProps{
+			ID:          uuid.New(),
+			Aggregate:   aggregate,
+			AggregateID: aggregateID,
+			Name:        name,
+			OccuredAt:   time.Now(),
+			Data:        data,
+		},
+	}
+}
+
+func (event *BaseDomainEvent) ID() uuid.UUID {
+	return event.props.ID
+}
+
+func (event *BaseDomainEvent) AggregateID() uint {
+	return event.props.AggregateID
+}
+
+func (event *BaseDomainEvent) Aggregate() string {
+	return event.props.Aggregate
+}
+
+func (event *BaseDomainEvent) ToJson() (string, error) {
+	b, err := json.Marshal(event.props)
+	if err != nil {
+		return "", nil
+	}
+	return string(b), nil
+}
+
+func (event *BaseDomainEvent) OccurredAt() time.Time {
+	return event.props.OccuredAt
+}
+
+func (event *BaseDomainEvent) Data() interface{} {
+	return event.props.Data
 }

domain/event/domain_event_publisher.go

@@ -1,9 +1,5 @@
 package event
 
-import (
-	"gorm.io/gorm"
-)
-
 // =----------------------
 // DomainEventPublisher
 // =----------------------
@@ -25,7 +21,7 @@ func (publisher *DomainEventPublisher) RegisterSubscriber(event IBaseDomainEvent
 }
 
 // Publish notifies all registered subscribers about the given events
-func (publisher *DomainEventPublisher) Publish(tx *gorm.DB, events ...IBaseDomainEvent) error {
+func (publisher *DomainEventPublisher) Publish(events ...IBaseDomainEvent) error {
 	for _, event := range events {
 		eventName := event.Name()
 

domain/event/event_storage.go

@@ -0,0 +1,27 @@
+package event
+
+var EventSource *EventStorage
+
+func init() {
+	if EventSource == nil {
+		EventSource = &EventStorage{
+			pendingEvents: make(map[string][]IBaseDomainEvent),
+		}
+	}
+}
+
+type EventStorage struct {
+	pendingEvents map[string][]IBaseDomainEvent
+}
+
+func (storage *EventStorage) AddEvent(dataModel string, domainEvent IBaseDomainEvent) {
+	if storage.pendingEvents[dataModel] == nil {
+		storage.pendingEvents[dataModel] = make([]IBaseDomainEvent, 0)
+	}
+
+	storage.pendingEvents[dataModel] = append(storage.pendingEvents[dataModel], domainEvent)
+}
+
+func (storage *EventStorage) GetPendingEvents(dataModel string) []IBaseDomainEvent {
+	return storage.pendingEvents[dataModel]
+}

go.mod

@@ -4,19 +4,23 @@ go 1.18
 
 require (
 	github.com/google/uuid v1.3.0
-	gorm.io/gorm v1.24.2
+	github.com/jackc/pgx/v5 v5.3.1
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/mattn/go-sqlite3 v1.14.15 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
 
 require (
-	github.com/jinzhu/inflection v1.0.0 // indirect
-	github.com/jinzhu/now v1.1.5 // indirect
-	github.com/stretchr/testify v1.8.1
-	gorm.io/driver/sqlite v1.4.3
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a // indirect
+	github.com/jackc/puddle/v2 v2.2.0 // indirect
+	github.com/stretchr/testify v1.8.2
+	golang.org/x/crypto v0.8.0 // indirect
+	golang.org/x/sync v0.1.0 // indirect
+	golang.org/x/text v0.9.0 // indirect
 )

go.sum

@@ -1,31 +1,41 @@
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
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 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-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 v1.1.4 h1:tHnRBy1i5F2Dh8BAFxqFzxKqqvezXrL2OW1TnX+Mlas=
-github.com/jinzhu/now v1.1.4/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
-github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
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+github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
+github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
+github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a h1:bbPeKD0xmW/Y25WS6cokEszi5g+S0QxI/d45PkRi7Nk=
+github.com/jackc/pgservicefile v0.0.0-20221227161230-091c0ba34f0a/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
+github.com/jackc/pgx/v5 v5.3.1 h1:Fcr8QJ1ZeLi5zsPZqQeUZhNhxfkkKBOgJuYkJHoBOtU=
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+github.com/jackc/puddle/v2 v2.2.0 h1:RdcDk92EJBuBS55nQMMYFXTxwstHug4jkhT5pq8VxPk=
+github.com/jackc/puddle/v2 v2.2.0/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
+github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
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+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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