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/*
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TIN - Time Tracking Application
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Copyright (C) 2021 Julio Biason
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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
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the Free Software Foundation, either version 3 of the License, or
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(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
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Affero General Public License for more details.
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You should have received a copy of the GNU Affero General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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use std::convert::Infallible;
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use async_trait::async_trait;
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/// Trait/tag for DTOs
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pub trait Dto {}
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/// Trait that all commands must implement.
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#[async_trait]
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pub trait Command<T: Dto> {
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async fn execute(&self) -> Result<&T, CommandError>;
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}
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/// Errors produced by invalid commands
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pub enum CommandError {
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/// The request identified used in the command is already used.
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IdentifierAlreadyUsed(String),
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/// Erro with the database
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DatabaseError,
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}
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impl From<sqlx::Error> for CommandError {
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fn from(_error: sqlx::Error) -> Self {
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Self::DatabaseError
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}
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}
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impl From<Infallible> for CommandError {
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fn from(_error: Infallible) -> Self {
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Self::DatabaseError
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}
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}
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