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