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|
open Piaf
let valid_debit value limit balance =
let balance_after_op = balance - value in
not (balance_after_op < limit * -1)
;;
let create_transaction client_id (db_pool : Query.pool) (request : Request.t) =
Caqti_eio.Pool.use
(fun conn ->
let client_opt =
Option.join @@ Result.to_option @@ Query.find_client client_id conn
in
match client_opt with
| Some client ->
let insert_result =
let body = Result.to_option @@ Body.to_string request.body in
let json =
Option.map
(fun str ->
try Yojson.Safe.from_string str with
| _ -> `Null)
body
in
let decoded_op = Option.bind json (Utils.Decoder.decode Operation.decoder) in
match decoded_op with
| Some (`Credit { value = _value; description = _desc } as op) ->
(match Query.execute_transaction ~client_id ~op conn with
| Ok _ as ok -> ok
| Error e -> Error (`DB e))
| Some (`Debit { value; description = _desc } as op) ->
if valid_debit value client.mov_limit client.balance
then (
match Query.execute_transaction ~client_id ~op conn with
| Ok _ as ok -> ok
| Error e -> Error (`DB e))
else Error `InvalidValue
| None -> Error (`Decoder "Invalid operation")
in
(match insert_result with
| Ok () ->
let json : Yojson.Safe.t =
`Assoc [ "limite", `Int client.mov_limit; "saldo", `Int client.balance ]
in
Ok (Response.of_string ~body:(Yojson.Safe.to_string json) `OK)
| Error _ -> Ok (Response.create (`Code 422)))
| None ->
Logs.info (fun m -> m "Não encontrei o cliente %d" client_id);
Ok (Response.create `Not_found))
db_pool
;;
let get_balance client_id (db_pool : Query.pool) (_request : Request.t) =
Caqti_eio.Pool.use
(fun conn ->
let client_opt =
Option.join @@ Result.to_option @@ Query.find_client client_id conn
in
match client_opt with
| Some client ->
let client_balance_opt =
Option.join @@ Result.to_option @@ Query.balance client_id conn
in
(match client_balance_opt with
| Some (balance_value, time) ->
let json : Yojson.Safe.t =
let balance =
let total = `Int balance_value in
let date =
`String
(Format.asprintf "%a" (Ptime.pp_rfc3339 ~tz_offset_s:(-10800) ()) time)
in
let limit = `Int client.mov_limit in
`Assoc [ "total", total; "data_extrato", date; "limite", limit ]
in
let t =
Result.fold ~ok:Fun.id ~error:(fun _ -> [])
@@ Query.transactions client_id conn
in
let last_transactions = `List (List.map Serializer.transaction t) in
`Assoc [ "saldo", balance; "ultimas_transacoes", last_transactions ]
in
Ok (Response.of_string ~body:(Yojson.Safe.to_string json) `OK)
| None ->
Logs.info (fun m -> m "Não encontrei o extrato do cliente %d" client_id);
Ok (Response.create `Not_found))
| None ->
Logs.info (fun m -> m "Não encontrei o cliente %d" client_id);
Ok (Response.create `Not_found))
db_pool
;;
|
