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// Copyright 2024 New Vector Ltd.
// Copyright 2023, 2024 The Matrix.org Foundation C.I.C.
//
// SPDX-License-Identifier: AGPL-3.0-only
// Please see LICENSE in the repository root for full details.
use sqlx::postgres::PgQueryResult;
use thiserror::Error;
use ulid::Ulid;
/// Generic error when interacting with the database
#[derive(Debug, Error)]
#[error(transparent)]
pub enum DatabaseError {
/// An error which came from the database itself
Driver {
/// The underlying error from the database driver
#[from]
source: sqlx::Error,
},
/// An error which occured while converting the data from the database
Inconsistency(#[from] DatabaseInconsistencyError),
/// An error which happened because the requested database operation is
/// invalid
#[error("Invalid database operation")]
InvalidOperation {
/// The source of the error, if any
#[source]
source: Option<Box<dyn std::error::Error + Send + Sync + 'static>>,
},
/// An error which happens when an operation affects not enough or too many
/// rows
#[error("Expected {expected} rows to be affected, but {actual} rows were affected")]
RowsAffected {
/// How many rows were expected to be affected
expected: u64,
/// How many rows were actually affected
actual: u64,
},
}
impl DatabaseError {
pub(crate) fn ensure_affected_rows(
result: &PgQueryResult,
expected: u64,
) -> Result<(), DatabaseError> {
let actual = result.rows_affected();
if actual == expected {
Ok(())
} else {
Err(DatabaseError::RowsAffected { expected, actual })
}
}
pub(crate) fn to_invalid_operation<E: std::error::Error + Send + Sync + 'static>(e: E) -> Self {
Self::InvalidOperation {
source: Some(Box::new(e)),
}
}
pub(crate) const fn invalid_operation() -> Self {
Self::InvalidOperation { source: None }
}
}
/// An error which occured while converting the data from the database
#[derive(Debug, Error)]
pub struct DatabaseInconsistencyError {
/// The table which was being queried
table: &'static str,
/// The column which was being queried
column: Option<&'static str>,
/// The row which was being queried
row: Option<Ulid>,
/// The source of the error
#[source]
source: Option<Box<dyn std::error::Error + Send + Sync + 'static>>,
}
impl std::fmt::Display for DatabaseInconsistencyError {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "Database inconsistency on table {}", self.table)?;
if let Some(column) = self.column {
write!(f, " column {column}")?;
}
if let Some(row) = self.row {
write!(f, " row {row}")?;
}
Ok(())
}
}
impl DatabaseInconsistencyError {
/// Create a new [`DatabaseInconsistencyError`] for the given table
#[must_use]
pub(crate) const fn on(table: &'static str) -> Self {
Self {
table,
column: None,
row: None,
source: None,
}
}
/// Set the column which was being queried
#[must_use]
pub(crate) const fn column(mut self, column: &'static str) -> Self {
self.column = Some(column);
self
}
/// Set the row which was being queried
#[must_use]
pub(crate) const fn row(mut self, row: Ulid) -> Self {
self.row = Some(row);
self
}
/// Give the source of the error
#[must_use]
pub(crate) fn source<E: std::error::Error + Send + Sync + 'static>(
mut self,
source: E,
) -> Self {
self.source = Some(Box::new(source));
self
}
}