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120
docs/EVENTS.md
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docs/EVENTS.md
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# Stocklet Docs: Events
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## Table of Contents
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* [Repository Overview](/README.md)
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* [Documentation: Overview](/docs/README.md)
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* [Documentation: Events](/docs/EVENTS.md)
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* [Documentation: Feature Roadmap](/docs/ROADMAP.md)
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## Overview
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The events are schemed and serialised using [protocol buffers](https://protobuf.dev/). The events schemas can be found in [``/schema/protobufs/stocklet/events/``](/schema/protobufs/stocklet/events/)
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They are dispatched using the [transactional outbox pattern](https://microservices.io/patterns/data/transactional-outbox.html). Debezium is used as a relay to publish events from database outbox tables to the message broker (Kafka). The Debezium connectors are configured by the ``service-init`` containers, which are also responsible for performing database migrations for their respective services.
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## Services
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### Auth Service
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**Produces:**
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* n/a
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**Consumes:**
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* UserDeletedEvent
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### Order Service
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**Produces:**
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* OrderCreatedEvent
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* OrderPendingEvent
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* OrderRejectedEvent
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* OrderApprovedEvent
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**Consumes:**
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* ProductPriceQuoteEvent
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* StockReservationEvent
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* ShipmentAllocationEvent
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* PaymentProcessedEvent
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### Payment Service
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**Produces:**
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* BalanceCreatedEvent
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* BalanceCreditedEvent
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* BalanceDebitedEvent
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* BalanceClosedEvent
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* TransactionLoggedEvent
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* TransactionReversedEvent *(currently unused)*
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* PaymentProcessedEvent
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**Consumes:**
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* UserCreatedEvent
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* UserDeletedEvent
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* ShipmentAllocationEvent
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### Product Service
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**Produces:**
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* ProductCreatedEvent
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* ProductPriceUpdatedEvent
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* ProductDeletedEvent
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* ProductPriceQuoteEvent
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**Consumes:**
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* OrderCreatedEvent
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### Shipping Service
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**Produces:**
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* ShipmentAllocationEvent
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* ShipmentDispatchedEvent *(currently unused)*
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**Consumes:**
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* StockReservationEvent
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* PaymentProcessedEvent
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### User Service
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**Produces:**
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* UserCreatedEvent
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* UserEmailUpdatedEvent
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* UserDeletedEvent
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**Consumes:**
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* n/a
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### Warehouse Service
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**Produces:**
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* StockCreatedEvent
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* StockAddedEvent *(currently unused)*
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* StockRemovedEvent
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* StockReservationEvent
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**Consumes:**
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* OrderPendingEvent
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* ShipmentAllocationEvent
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* PaymentProcessedEvent
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## Miscellaneous
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### Place Order Saga
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The place order [saga](https://microservices.io/patterns/data/saga.html) is initiated when a new order is created.
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18
docs/README.md
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18
docs/README.md
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# Stocklet Docs
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## Table of Contents
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* [Repository Overview](/README.md)
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* [Documentation: Overview](/docs/README.md)
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* [Documentation: Events](/docs/EVENTS.md)
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* [Documentation: Feature Roadmap](/docs/ROADMAP.md)
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## Formatting, styling, etc
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The code has been formatted using [`gofmt`](https://pkg.go.dev/cmd/gofmt).
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The protobuf schema files have been formatted using [`buf format`](https://buf.build/docs/reference/cli/buf/format).
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The markdown files have been linted and formatted using [markdownlint](https://github.com/DavidAnson/markdownlint).
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I used [PlantUML](https://plantuml.com/) as the tool to help make the diagrams. The PlantUML files are avaliable alongside the resulting images: [`/docs/imgs/overview.plantuml`](/docs/imgs/overview.plantuml) and [`/docs/imgs/placeordersaga.plantuml`](/docs/imgs/placeordersaga.plantuml)
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35
docs/ROADMAP.md
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35
docs/ROADMAP.md
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# Stocklet Docs: Feature Roadmap
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## Table of Contents
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||||
|
||||
* [Repository Overview](/README.md)
|
||||
* [Documentation: Overview](/docs/README.md)
|
||||
* [Documentation: Events](/docs/EVENTS.md)
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* [Documentation: Feature Roadmap](/docs/ROADMAP.md)
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## Prologue
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This document should be considered a brainstorm of ideas.
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There is no guarantee that I will implement any listed features or functionality below. After all, I initially made this application as an experiment with EDA, and there are areas that could use improvement and expansion (the application is a prototype in current format). Some of the current implemented functionality is quite bare-bones, so if I come to revisit this project at a later date this document is where I'd first look.
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However, contributions are welcome; if you feel like implementing something (already below or not), or otherwise spot other areas that could use improvement, then please feel free to open an issue to discuss or a pull request with your implementation.
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## Feature Ideas
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* Front-end user interface
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* Allow interfaces with the application through alternatives means
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* Notification service
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* Send notifications to users (e.g. through a mock email or a unread messages mechanism) upon reciept of events related to order status changes (i.e. OrderApprovedEvent)
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* Product recommendation service
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* Provide a list of recommended products catered to specific customers
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## Miscellaneous Ideas
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* Integration tests
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* Ensured idempotency in event consumers (service-side)
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* Clear-up of event processes
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* Kubernetes deployment (prepare manifest files)
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* Interchangable infrastructure
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* Support for NATS as a message broker
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* Support for MongoDB as a database
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125
docs/imgs/overview.plantuml
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125
docs/imgs/overview.plantuml
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@@ -0,0 +1,125 @@
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' Copyright (C) 2024 Declan Teevan
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'
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' This program is free software: you can redistribute it and/or modify
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' it under the terms of the GNU Affero General Public License as published by
|
||||
' the Free Software Foundation, either version 3 of the License, or
|
||||
' (at your option) any later version.
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||||
'
|
||||
' This program is distributed in the hope that it will be useful,
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||||
' but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
' GNU Affero General Public License for more details.
|
||||
'
|
||||
' You should have received a copy of the GNU Affero General Public License
|
||||
' along with this program. If not, see <https://www.gnu.org/licenses/>.
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|
||||
@startuml overview
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||||
!theme mars
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||||
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||||
cloud "API Gateway (Envoy)" as APIGateway
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queue "Message Broker (Kafka)" as MsgBroker
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collections "Message Relay (Debezium)" as OutboxConnector
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database "Auth Database" as AuthDB
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database "Order Database" as OrderDB
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database "Payment Database" as PaymentDB
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database "Product Database" as ProductDB
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database "Shipping Database" as ShippingDB
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database "User Database" as UserDB
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||||
database "Warehouse Database" as WarehouseDB
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||||
|
||||
rectangle "Auth Service" as AuthService {
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||||
agent "gRPC Gateway" as AuthGateway
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||||
agent "Event Consumer" as AuthConsumer
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||||
usecase "gRPC Service" as AuthGrpc
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|
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AuthGrpc <-u- AuthGateway
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AuthGrpc <-u- AuthConsumer
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AuthGrpc --> AuthDB
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}
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||||
|
||||
rectangle "Order Service" as OrderService {
|
||||
agent "gRPC Gateway" as OrderGateway
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||||
agent "Event Consumer" as OrderConsumer
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||||
usecase "gRPC Service" as OrderGrpc
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OrderGrpc <-u- OrderGateway
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OrderGrpc <-u- OrderConsumer
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OrderGrpc --> OrderDB
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}
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||||
|
||||
rectangle "Payment Service" as PaymentService {
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||||
agent "gRPC Gateway" as PaymentGateway
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||||
agent "Event Consumer" as PaymentConsumer
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usecase "gRPC Service" as PaymentGrpc
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PaymentGrpc <-u- PaymentGateway
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PaymentGrpc <-u- PaymentConsumer
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PaymentGrpc --> PaymentDB
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}
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||||
|
||||
rectangle "Product Service" as ProductService {
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||||
agent "gRPC Gateway" as ProductGateway
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||||
agent "Event Consumer" as ProductConsumer
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||||
usecase "gRPC Service" as ProductGrpc
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ProductGrpc <-u- ProductGateway
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ProductGrpc <-u- ProductConsumer
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ProductGrpc --> ProductDB
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}
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||||
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rectangle "Shipping Service" as ShippingService {
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agent "gRPC Gateway" as ShippingGateway
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agent "Event Consumer" as ShippingConsumer
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||||
usecase "gRPC Service" as ShippingGrpc
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ShippingGrpc <-u- ShippingGateway
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ShippingGrpc <-u- ShippingConsumer
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ShippingGrpc --> ShippingDB
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}
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||||
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||||
rectangle "User Service" as UserService {
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agent "gRPC Gateway" as UserGateway
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||||
usecase "gRPC Service" as UserGrpc
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||||
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||||
UserGrpc <-u- UserGateway
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||||
UserGrpc --> UserDB
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||||
}
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||||
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||||
rectangle "Warehouse Service" as WarehouseService {
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||||
agent "gRPC Gateway" as WarehouseGateway
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||||
agent "Event Consumer" as WarehouseConsumer
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||||
usecase "gRPC Service" as WarehouseGrpc
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||||
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||||
WarehouseGrpc <-u- WarehouseGateway
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||||
WarehouseGrpc <-u- WarehouseConsumer
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||||
WarehouseGrpc --> WarehouseDB
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||||
}
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||||
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||||
APIGateway ....> AuthGateway : "HTTP"
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||||
APIGateway ....> OrderGateway : "HTTP"
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||||
APIGateway ....> PaymentGateway : "HTTP"
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||||
APIGateway ....> ProductGateway : "HTTP"
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||||
APIGateway ....> ShippingGateway : "HTTP"
|
||||
APIGateway ....> UserGateway : "HTTP"
|
||||
APIGateway ....> WarehouseGateway : "HTTP"
|
||||
|
||||
UserGrpc .l.> AuthGrpc : "gRPC "
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||||
|
||||
AuthDB ---[hidden]> OutboxConnector
|
||||
OrderDB ---> OutboxConnector : "Outbox"
|
||||
PaymentDB ---> OutboxConnector : "Outbox"
|
||||
ProductDB ---> OutboxConnector : "Outbox"
|
||||
ShippingDB ---> OutboxConnector : "Outbox"
|
||||
UserDB ---> OutboxConnector : "Outbox"
|
||||
WarehouseDB ---> OutboxConnector : "Outbox"
|
||||
|
||||
OutboxConnector ..> MsgBroker : "Publish Events"
|
||||
|
||||
MsgBroker ...> AuthConsumer
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||||
MsgBroker ...> OrderConsumer
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||||
MsgBroker ...> PaymentConsumer
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||||
MsgBroker ...> ProductConsumer
|
||||
MsgBroker ...> ShippingConsumer
|
||||
MsgBroker ...> WarehouseConsumer
|
||||
@enduml
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||||
235
docs/imgs/overview.svg
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235
docs/imgs/overview.svg
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|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<svg style="width:2273px;height:799px;background:#F9F9F9;" contentStyleType="text/css" preserveAspectRatio="none" version="1.1" viewBox="0 0 2273 799" width="2273px" height="799px" xmlns="http://www.w3.org/2000/svg" zoomAndPan="magnify">
|
||||
<rect x="355" y="240.33" width="324" height="180.98" rx="3.5" ry="3.5" fill="none" stroke="#393939"/>
|
||||
<text x="466.5" y="255.3255" fill="#aa0000" font-family="sans-serif" font-size="14" font-weight="bold" textLength="101">Auth Service</text>
|
||||
<rect x="899" y="240.33" width="324" height="180.98" rx="3.5" ry="3.5" fill="none" stroke="#393939"/>
|
||||
<text x="1006" y="255.3255" fill="#aa0000" font-family="sans-serif" font-size="14" font-weight="bold" textLength="110">Order Service</text>
|
||||
<rect x="7" y="240.33" width="324" height="180.98" rx="3.5" ry="3.5" fill="none" stroke="#393939"/>
|
||||
<text x="103" y="255.3255" fill="#aa0000" font-family="sans-serif" font-size="14" font-weight="bold" textLength="132">Payment Service</text>
|
||||
<rect x="1595" y="240.33" width="324" height="180.98" rx="3.5" ry="3.5" fill="none" stroke="#393939"/>
|
||||
<text x="1694" y="255.3255" fill="#aa0000" font-family="sans-serif" font-size="14" font-weight="bold" textLength="126">Product Service</text>
|
||||
<rect x="1247" y="240.33" width="324" height="180.98" rx="3.5" ry="3.5" fill="none" stroke="#393939"/>
|
||||
<text x="1343" y="255.3255" fill="#aa0000" font-family="sans-serif" font-size="14" font-weight="bold" textLength="132">Shipping Service</text>
|
||||
<rect x="703" y="240.33" width="172" height="180.98" rx="3.5" ry="3.5" fill="none" stroke="#393939"/>
|
||||
<text x="738.5" y="255.3255" fill="#aa0000" font-family="sans-serif" font-size="14" font-weight="bold" textLength="101">User Service</text>
|
||||
<rect x="1943" y="240.33" width="324" height="180.98" rx="3.5" ry="3.5" fill="none" stroke="#393939"/>
|
||||
<text x="2028" y="255.3255" fill="#aa0000" font-family="sans-serif" font-size="14" font-weight="bold" textLength="154">Warehouse Service</text>
|
||||
<rect x="541.5" y="275.33" width="121" height="36.297" rx="3.5" ry="3.5" fill="#313139" stroke="#E7E7E7" stroke-width=".5"/>
|
||||
<text x="551.5" y="298.3255" fill="#FFFFFF" font-family="sans-serif" font-size="14" textLength="101">gRPC Gateway</text>
|
||||
<rect x="371.5" y="275.33" width="135" height="36.297" rx="3.5" ry="3.5" fill="#313139" stroke="#E7E7E7" stroke-width=".5"/>
|
||||
<text x="381.5" y="298.3255" fill="#FFFFFF" font-family="sans-serif" font-size="14" textLength="115">Event Consumer</text>
|
||||
<ellipse cx="548" cy="388.97" rx="69.695" ry="16.339" fill="#313139" stroke="#E7E7E7" stroke-width=".5"/>
|
||||
<text x="498.9952" y="392.7169" fill="#FFFFFF" font-family="sans-serif" font-size="14" textLength="92">gRPC Service</text>
|
||||
<rect x="1085.5" y="275.33" width="121" height="36.297" rx="3.5" ry="3.5" fill="#313139" stroke="#E7E7E7" stroke-width=".5"/>
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||||
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||||
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|
||||
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||||
<text x="195.9952" y="392.7169" fill="#FFFFFF" font-family="sans-serif" font-size="14" textLength="92">gRPC Service</text>
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||||
<rect x="1611.5" y="275.33" width="121" height="36.297" rx="3.5" ry="3.5" fill="#313139" stroke="#E7E7E7" stroke-width=".5"/>
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<text x="1621.5" y="298.3255" fill="#FFFFFF" font-family="sans-serif" font-size="14" textLength="101">gRPC Gateway</text>
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||||
<rect x="1767.5" y="275.33" width="135" height="36.297" rx="3.5" ry="3.5" fill="#313139" stroke="#E7E7E7" stroke-width=".5"/>
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<text x="1777.5" y="298.3255" fill="#FFFFFF" font-family="sans-serif" font-size="14" textLength="115">Event Consumer</text>
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<text x="1634.9952" y="392.7169" fill="#FFFFFF" font-family="sans-serif" font-size="14" textLength="92">gRPC Service</text>
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||||
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||||
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|
||||
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||||
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||||
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After Width: | Height: | Size: 22 KiB |
81
docs/imgs/placeordersaga.plantuml
Normal file
81
docs/imgs/placeordersaga.plantuml
Normal file
@@ -0,0 +1,81 @@
|
||||
' Copyright (C) 2024 Declan Teevan
|
||||
'
|
||||
' This program is free software: you can redistribute it and/or modify
|
||||
' it under the terms of the GNU Affero General Public License as published by
|
||||
' the Free Software Foundation, either version 3 of the License, or
|
||||
' (at your option) any later version.
|
||||
'
|
||||
' This program is distributed in the hope that it will be useful,
|
||||
' but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
' MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
' GNU Affero General Public License for more details.
|
||||
'
|
||||
' You should have received a copy of the GNU Affero General Public License
|
||||
' along with this program. If not, see <https://www.gnu.org/licenses/>.
|
||||
|
||||
@startuml placeordersaga
|
||||
!theme mars
|
||||
|
||||
|Order|
|
||||
start
|
||||
:OrderCreatedEvent;
|
||||
|
||||
|Product|
|
||||
:ProductPriceQuoteEvent;
|
||||
if (type) is (<color:red>UNAVALIABLE) then
|
||||
|Order|
|
||||
:<color:red>OrderRejectedEvent;
|
||||
kill
|
||||
else (<color:green>AVALIABLE)
|
||||
endif
|
||||
|
||||
|Order|
|
||||
:OrderPendingEvent;
|
||||
|
||||
|Warehouse|
|
||||
:StockReservationEvent;
|
||||
if (type) is (<color:red>INSUFFICIENT_STOCK) then
|
||||
|Order|
|
||||
:<color:red>OrderRejectedEvent;
|
||||
kill
|
||||
else (<color:green>STOCK_RESERVED)
|
||||
endif
|
||||
|
||||
|Shipping|
|
||||
:ShipmentAllocationEvent;
|
||||
if (type) is (<color:red>FAILED) then
|
||||
|Warehouse|
|
||||
:StockReservationEvent\n<color:grey>type: STOCK_RETURNED;
|
||||
|
||||
|Order|
|
||||
:<color:red>OrderRejectedEvent;
|
||||
kill
|
||||
else (<color:green>ALLOCATED)
|
||||
endif
|
||||
|
||||
|Payment|
|
||||
:PaymentProcessedEvent;
|
||||
if (type) is (<color:red>FAILED) then
|
||||
|Shipping|
|
||||
:ShipmentAllocationEvent\n<color:grey>type: ALLOCATION_RELEASED;
|
||||
|
||||
|Warehouse|
|
||||
:StockReservationEvent\n<color:grey>type: STOCK_RETURNED;
|
||||
|
||||
|Order|
|
||||
:<color:red>OrderRejectedEvent;
|
||||
kill
|
||||
else (<color:green>SUCCESS)
|
||||
endif
|
||||
|
||||
fork
|
||||
|Warehouse|
|
||||
:StockReservationEvent\n<color:grey>type: STOCK_CONSUMED;
|
||||
kill
|
||||
fork again
|
||||
|Order|
|
||||
:<color:green>OrderApprovedEvent;
|
||||
stop
|
||||
end merge
|
||||
|
||||
@enduml
|
||||
142
docs/imgs/placeordersaga.svg
Normal file
142
docs/imgs/placeordersaga.svg
Normal file
@@ -0,0 +1,142 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
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<svg style="width:1250px;height:1276px;background:#F9F9F9;" contentStyleType="text/css" preserveAspectRatio="none" version="1.1" viewBox="0 0 1250 1276" width="1250px" height="1276px" xmlns="http://www.w3.org/2000/svg" zoomAndPan="magnify">
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<rect width="1250" height="1276" fill="#F9F9F9"/>
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<rect x="15" y="12.745" width="1217" height="20.953" fill="none"/>
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<rect x="23.5" y="78.698" width="140" height="33.969" rx="3.5" ry="3.5" fill="#F1F1F1" stroke="#181818" stroke-width=".5"/>
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<text x="33.5" y="99.8369" fill="#000000" font-family="sans-serif" font-size="12" textLength="120">OrderCreatedEvent</text>
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<text x="31" y="256.1768" fill="#FF0000" font-family="sans-serif" font-size="12" textLength="125">OrderRejectedEvent</text>
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<text x="31" y="488.4854" fill="#FF0000" font-family="sans-serif" font-size="12" textLength="125">OrderRejectedEvent</text>
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<text transform="translate(0 33.158)" x="128" y="1160.9307" fill="#008000" font-family="sans-serif" font-size="12px" textLength="129">OrderApprovedEvent</text>
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<text x="367.5" y="220.8462" fill="#FF0000" font-family="sans-serif" font-size="11" textLength="74">UNAVALIABLE</text>
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<text x="351.5" y="202.4438" fill="#000000" font-family="sans-serif" font-size="11" textLength="24">type</text>
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<text x="387.5" y="196.0415" fill="#008000" font-family="sans-serif" font-size="11" textLength="58">AVALIABLE</text>
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<text x="584.5" y="386.1143" fill="#000000" font-family="sans-serif" font-size="12" textLength="144">StockReservationEvent</text>
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<text x="660.5" y="453.1548" fill="#FF0000" font-family="sans-serif" font-size="11" textLength="120">INSUFFICIENT_STOCK</text>
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<text x="644.5" y="434.7524" fill="#000000" font-family="sans-serif" font-size="11" textLength="24">type</text>
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<text x="680.5" y="428.3501" fill="#008000" font-family="sans-serif" font-size="11" textLength="103">STOCK_RESERVED</text>
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<text x="583.5" y="666.8252" fill="#000000" font-family="sans-serif" font-size="12" textLength="144">StockReservationEvent</text>
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<text x="583.5" y="680.7939" fill="#808080" font-family="sans-serif" font-size="12" textLength="146">type: STOCK_RETURNED</text>
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<rect x="573.5" y="969.89" width="166" height="47.938" rx="3.5" ry="3.5" fill="#F1F1F1" stroke="#181818" stroke-width=".5"/>
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<text x="583.5" y="991.0244" fill="#000000" font-family="sans-serif" font-size="12" textLength="144">StockReservationEvent</text>
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<text x="583.5" y="1004.9932" fill="#808080" font-family="sans-serif" font-size="12" textLength="146">type: STOCK_RETURNED</text>
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<text x="493" y="1182.4463" fill="#000000" font-family="sans-serif" font-size="12" textLength="144">StockReservationEvent</text>
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<text x="493" y="1196.415" fill="#808080" font-family="sans-serif" font-size="12" textLength="150">type: STOCK_CONSUMED</text>
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<line x1="465" x2="465" y1="12.745" y2="1264.8" stroke="#000" stroke-width="1.5"/>
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<text x="826.5" y="564.4541" fill="#000000" font-family="sans-serif" font-size="12" textLength="155">ShipmentAllocationEvent</text>
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<text x="908" y="631.4946" fill="#FF0000" font-family="sans-serif" font-size="11" textLength="37">FAILED</text>
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<text x="892" y="613.0923" fill="#000000" font-family="sans-serif" font-size="11" textLength="24">type</text>
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||||
<text x="928" y="606.6899" fill="#008000" font-family="sans-serif" font-size="11" textLength="65">ALLOCATED</text>
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<rect x="805.5" y="901.95" width="197" height="47.938" rx="3.5" ry="3.5" fill="#F1F1F1" stroke="#181818" stroke-width=".5"/>
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<text x="815.5" y="923.0869" fill="#000000" font-family="sans-serif" font-size="12" textLength="155">ShipmentAllocationEvent</text>
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||||
<text x="815.5" y="937.0557" fill="#808080" font-family="sans-serif" font-size="12" textLength="177">type: ALLOCATION_RELEASED</text>
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<line x1="799.5" x2="799.5" y1="12.745" y2="1264.8" stroke="#000" stroke-width="1.5"/>
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<text x="1032" y="820.7158" fill="#000000" font-family="sans-serif" font-size="12" textLength="155">PaymentProcessedEvent</text>
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<text x="1113.5" y="887.7563" fill="#FF0000" font-family="sans-serif" font-size="11" textLength="37">FAILED</text>
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<text x="1097.5" y="869.354" fill="#000000" font-family="sans-serif" font-size="11" textLength="24">type</text>
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<text x="1133.5" y="862.9517" fill="#008000" font-family="sans-serif" font-size="11" textLength="55">SUCCESS</text>
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After Width: | Height: | Size: 14 KiB |
Reference in New Issue
Block a user