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use std::{fmt::Display, mem};
use crate::app::App;
use chrono::Utc;
use log::{debug, trace};
use serde::{Serialize, de::DeserializeOwned};
use sqlx::{SqliteConnection, query};
pub(crate) mod barcode;
pub(crate) mod product;
pub(crate) mod product_parent;
pub(crate) mod unit;
pub(crate) mod unit_property;
pub(crate) mod recipe;
pub(crate) trait Transactionable:
Sized + std::fmt::Debug + Serialize + DeserializeOwned
{
type ApplyError: std::error::Error + Display;
type UndoError: std::error::Error + Display;
/// Apply this transaction.
///
/// This should change the db state.
async fn apply(self, txn: &mut SqliteConnection) -> Result<(), Self::ApplyError>;
/// Undo this transaction.
///
/// This should return the db to the state it was in before this transaction.
async fn undo(self, txn: &mut SqliteConnection) -> Result<(), Self::UndoError>;
}
#[derive(Debug)]
pub(crate) struct Operations<O: Transactionable> {
name: &'static str,
ops: Vec<O>,
}
impl<O: Transactionable> Default for Operations<O> {
fn default() -> Self {
Self::new("<default impl>")
}
}
impl<O: Transactionable> Operations<O> {
#[must_use]
pub(crate) fn new(name: &'static str) -> Self {
Self {
name,
ops: Vec::new(),
}
}
pub(crate) async fn apply(mut self, app: &App) -> Result<(), apply::Error<O>> {
let ops = mem::take(&mut self.ops);
if ops.is_empty() {
return Ok(());
}
trace!("Begin commit of {}", self.name);
let mut txn = app.db.begin().await?;
for op in ops {
trace!("Commiting operation: {op:?}");
add_operation_to_txn_log(&op, &mut txn).await?;
op.apply(&mut txn)
.await
.map_err(|err| apply::Error::InnerApply(err))?;
}
txn.commit().await?;
trace!("End commit of {}", self.name);
Ok(())
}
pub(crate) fn push(&mut self, op: O) {
self.ops.push(op);
}
}
pub(crate) mod apply {
use actix_web::{ResponseError, http::header::HeaderValue};
use log::error;
use crate::storage::sql::insert::{Transactionable, add_operations_to_txn_log};
#[derive(thiserror::Error, Debug)]
pub(crate) enum Error<O: Transactionable> {
#[error("Failed to execute sql statments")]
Sql(#[from] sqlx::Error),
#[error("Failed to append operations to the txn log: {0}")]
TxnLogAppend(#[from] add_operations_to_txn_log::Error),
#[error("Failed to apply one of the operations: {0}")]
InnerApply(<O as Transactionable>::ApplyError),
}
impl<O: Transactionable> ResponseError for Error<O> {
fn status_code(&self) -> actix_web::http::StatusCode {
actix_web::http::StatusCode::INTERNAL_SERVER_ERROR
}
fn error_response(&self) -> actix_web::HttpResponse<actix_web::body::BoxBody> {
error!("Emmiting `INTERNAL_SERVER_ERROR`: {self}");
let mut res =
actix_web::HttpResponse::new(self.status_code()).set_body(self.to_string());
let mime = actix_web::mime::TEXT_PLAIN_UTF_8;
res.headers_mut().insert(
actix_web::http::header::CONTENT_TYPE,
HeaderValue::from_str(mime.to_string().as_str()).expect("Hard-coded conversion"),
);
res.set_body(actix_web::body::BoxBody::new(self.to_string()))
}
}
}
impl<O: Transactionable> Drop for Operations<O> {
fn drop(&mut self) {
assert!(
self.ops.is_empty(),
"Trying to drop uncommitted operations (name: {}) ({:#?}). This is a bug.",
self.name,
self.ops
);
}
}
async fn add_operation_to_txn_log<O: Transactionable>(
operation: &O,
txn: &mut SqliteConnection,
) -> Result<(), add_operations_to_txn_log::Error> {
debug!("Adding operation to txn log: {operation:?}");
let now = Utc::now().timestamp();
let operation = serde_json::to_string(&operation).expect("should be serializable");
query!(
r#"
INSERT INTO txn_log (
timestamp,
operation
)
VALUES (?, ?);
"#,
now,
operation,
)
.execute(txn)
.await?;
Ok(())
}
pub(crate) mod add_operations_to_txn_log {
#[derive(thiserror::Error, Debug)]
pub(crate) enum Error {
#[error("Failed to execute sql statments")]
SqlError(#[from] sqlx::Error),
}
}
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