[hw-3] loms service

docs/homework-3/img/cart-cart-checkout.plantuml

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+@startuml
+
+actor User as u
+collections Cart as c
+database CartStorage as cs
+collections Order as o
+
+u -> c : POST /checkout/<user_id>
+activate c
+c -> cs : cart.GetItemsByUserID
+c -> o : gRPC Loms.OrderCreate\n\t- user\n\t- []item
+c -> cs : cart.DeleteItemsByUserID
+
+c -> u : Response: 200 OK
+
+deactivate c
+
+@enduml

docs/homework-3/img/cart-cart-item-add.plantuml

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+@startuml
+
+actor User as u
+collections Cart as c
+database CartStorage as cs
+collections ProductService as p
+collections Order as o
+
+u -> c : POST /user/<user_id>/cart/<sku_id>\n\t- count
+activate c
+loop for each item in request
+  c -> p : /get_product\n\t- sku\n\t- token
+  activate p
+    p -> c : \nResponse:\n\t- name\n\t- price
+  deactivate p
+  c -> c : validate product exists
+
+  c -> o : gRPC Loms.StocksInfo\n\t- sku
+  activate o
+    o -> c : Response:\n\t- count
+  deactivate o
+  c -> c : validate stocks
+  alt stocks enough
+    c -> cs : cart.AddItem()
+    c -> u : 200 OK
+  else
+    c -> u : 412 Failed Precondition (insufficient stocks)
+  end
+end
+deactivate c
+
+@enduml

docs/homework-3/img/loms-order-cancel.plantuml

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+@startuml
+
+actor User as u
+collections LOMS as l
+database OrdersStorage as os
+database StocksStorage as ss
+
+u -> l : gRPC Loms.OrderCancel\n\t- orderID
+activate l
+
+l -> os : order.GetByOrderID()
+l -> ss : stocks.ReserveCancel()
+l -> os : order.SetStatus(cancelled)
+deactivate l
+
+l -> u : Response: OK (code_id=0)
+
+@enduml

docs/homework-3/img/loms-order-create.plantuml

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+@startuml
+
+actor User as u
+collections LOMS as l
+database OrdersStorage as os
+database StocksStorage as ss
+
+u -> l : gRPC Loms.OrderCreate\n\t- user\n\t- items: []item{\n\t\t- sku\n\t\t- count\n\t  }
+activate l
+l -> os : order.Create()\n\tstatus=new
+l -> ss : stocks.Reserve()
+
+alt Reserve success
+  l -> os : order.SetStatus(awaiting payment)
+  l -> u : Response: OK (code_id=0)\n\t- orderID
+else
+  l -> os : order.SetStatus(failed)
+  l -> u : Failed Precondition (code_id 9)
+end
+deactivate l
+
+@enduml

docs/homework-3/img/loms-order-info.plantuml

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+@startuml
+
+actor User as u
+collections LOMS as l
+database OrdersStorage as os
+
+u -> l : gRPC Loms.OrderInfo\n\t- orderID int64
+activate l
+
+l -> os : order.GetByID()
+alt order exists
+  l -> u : Response: OK (code_id=0)\n\t- status\n\t- user\n\t- []items{}
+else
+  l -> u : Response: Not Found (code_id=5)
+end
+
+deactivate l
+
+@enduml

docs/homework-3/img/loms-order-pay.plantuml

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+@startuml
+
+actor User as u
+collections LOMS as l
+database OrdersStorage as os
+database StocksStorage as ss
+
+u -> l : gRPC Loms.OrderPay\n\t- orderID
+activate l
+l -> ss : stocks.ReserveRemove()
+l -> os : order.SetStatus(payed)
+
+l -> u : Response: OK (code_id=0)
+
+deactivate l
+
+@enduml

docs/homework-3/img/loms-stok-info.plantuml

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+@startuml
+
+actor User as u
+collections LOMS as l
+database StocksStorage as ss
+
+u -> l : gRPC Loms.StocksInfo\n\t- sku
+activate l
+
+l -> ss : stocks.GetBySKU()
+
+l -> u : Response: OK (code_id=0)\n- count
+deactivate l
+
+@enduml