use std::any::{Any, type_name};
use crate::{
CountQuery, DeleteQuery, DinocoMysql, DinocoPostgres, DinocoRowModel, DinocoSqlCompiler, DinocoSqlite, DinocoValue,
FindQuery, InsertQuery, MysqlRow, PostgresRow, SqliteRow, UpdateQuery,
};
type TransactionAny = Box<dyn Any + Send>;
type TransactionFinish = Box<dyn FnOnce(RawTransactionOutput) -> anyhow::Result<TransactionAny> + Send + Sync>;
pub struct TransactionResults {
values: Vec<Option<TransactionValue>>,
}
impl std::fmt::Debug for TransactionResults {
fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let types = self
.values
.iter()
.map(|value| value.as_ref().map(|value| value.type_name).unwrap_or("<taken>"))
.collect::<Vec<_>>();
formatter.debug_struct("TransactionResults").field("types", &types).finish()
}
}
pub(crate) struct TransactionValue {
value: TransactionAny,
type_name: &'static str,
}
impl TransactionResults {
pub(crate) fn new(values: Vec<TransactionValue>) -> Self {
Self { values: values.into_iter().map(Some).collect() }
}
pub fn len(&self) -> usize {
self.values.len()
}
pub fn is_empty(&self) -> bool {
self.values.is_empty()
}
pub fn get<T>(&self, index: usize) -> anyhow::Result<&T>
where
T: Send + 'static,
{
let result = self
.values
.get(index)
.ok_or_else(|| anyhow::anyhow!("Transaction result index {index} is out of bounds."))?
.as_ref()
.ok_or_else(|| anyhow::anyhow!("Transaction result at index {index} was already taken."))?;
result.value.downcast_ref::<T>().ok_or_else(|| {
anyhow::anyhow!(
"Transaction result at index {index} has type `{}`, not `{}`.",
result.type_name,
type_name::<T>(),
)
})
}
pub fn take<T>(&mut self, index: usize) -> anyhow::Result<T>
where
T: Send + 'static,
{
let result = self
.values
.get_mut(index)
.ok_or_else(|| anyhow::anyhow!("Transaction result index {index} is out of bounds."))?
.take()
.ok_or_else(|| anyhow::anyhow!("Transaction result at index {index} was already taken."))?;
let actual_type = result.type_name;
result.value.downcast::<T>().map(|value| *value).map_err(|_| {
anyhow::anyhow!(
"Transaction result at index {index} has type `{actual_type}`, not `{}`.",
type_name::<T>(),
)
})
}
}
pub struct TransactionCommand {
statement: TransactionStatement,
output: TransactionOutputAdapter,
}
enum TransactionStatement {
Find(FindQuery),
Insert(InsertQuery),
Update(UpdateQuery),
Delete(DeleteQuery),
Count(CountQuery),
Noop,
Invalid(String),
}
struct TransactionOutputAdapter {
kind: TransactionCommandKind,
decoder: Option<TransactionRowDecoder>,
finish: TransactionFinish,
type_name: &'static str,
}
#[derive(Clone, Copy)]
pub(crate) struct TransactionRowDecoder {
pub sqlite: fn(&SqliteRow<'_>) -> Option<TransactionAny>,
pub postgres: fn(&PostgresRow) -> Option<TransactionAny>,
pub mysql: fn(&MysqlRow) -> Option<TransactionAny>,
}
#[derive(Clone, Copy, PartialEq, Eq)]
pub(crate) enum TransactionCommandKind {
Rows,
Execute,
Count,
}
pub(crate) enum RawTransactionOutput {
Rows(Vec<TransactionAny>),
Affected(usize),
Count(i64),
}
pub(crate) struct CompiledTransactionCommand {
pub sql: String,
pub params: Vec<DinocoValue>,
pub kind: TransactionCommandKind,
pub decoder: Option<TransactionRowDecoder>,
finish: TransactionFinish,
type_name: &'static str,
}
impl TransactionCommand {
pub fn find_first<M>(query: FindQuery) -> Self
where
M: DinocoRowModel,
{
Self::rows::<M, Option<M>, _>(TransactionStatement::Find(query), |mut rows| Ok(rows.drain(..).next()))
}
pub fn find_many<M>(query: FindQuery) -> Self
where
M: DinocoRowModel,
{
Self::rows::<M, Vec<M>, _>(TransactionStatement::Find(query), Ok)
}
pub fn insert(query: InsertQuery) -> Self {
Self::unit(TransactionStatement::Insert(query))
}
pub fn empty_write() -> Self {
Self::unit(TransactionStatement::Noop)
}
pub fn insert_returning<M>(query: InsertQuery, missing_message: String) -> Self
where
M: DinocoRowModel,
{
Self::rows::<M, M, _>(TransactionStatement::Insert(query), move |mut rows| {
rows.drain(..).next().ok_or_else(|| anyhow::anyhow!(missing_message))
})
}
pub fn insert_returning_many<M>(query: InsertQuery) -> Self
where
M: DinocoRowModel,
{
Self::rows::<M, Vec<M>, _>(TransactionStatement::Insert(query), Ok)
}
pub fn empty_rows<M>() -> Self
where
M: DinocoRowModel,
{
Self::rows::<M, Vec<M>, _>(TransactionStatement::Noop, Ok)
}
pub fn update(query: UpdateQuery) -> Self {
Self::unit(TransactionStatement::Update(query))
}
pub fn update_returning<M>(query: UpdateQuery) -> Self
where
M: DinocoRowModel,
{
Self::rows::<M, Vec<M>, _>(TransactionStatement::Update(query), Ok)
}
pub fn update_returning_one<M>(query: UpdateQuery, missing_message: String) -> Self
where
M: DinocoRowModel,
{
Self::rows::<M, M, _>(TransactionStatement::Update(query), move |mut rows| {
rows.pop().ok_or_else(|| anyhow::anyhow!(missing_message))
})
}
pub fn delete(query: DeleteQuery) -> Self {
Self::unit(TransactionStatement::Delete(query))
}
pub fn delete_returning<M>(query: DeleteQuery) -> Self
where
M: DinocoRowModel,
{
Self::rows::<M, Vec<M>, _>(TransactionStatement::Delete(query), Ok)
}
pub fn count<T>(query: CountQuery, mapper: fn(i64) -> T) -> Self
where
T: Send + 'static,
{
let finish = Box::new(move |raw| {
let RawTransactionOutput::Count(total) = raw else {
anyhow::bail!("Dinoco transaction count received an unexpected database result.");
};
Ok(Box::new(mapper(total)) as TransactionAny)
});
Self {
statement: TransactionStatement::Count(query),
output: TransactionOutputAdapter {
kind: TransactionCommandKind::Count,
decoder: None,
finish,
type_name: type_name::<T>(),
},
}
}
pub fn invalid(message: impl Into<String>) -> Self {
Self {
statement: TransactionStatement::Invalid(message.into()),
output: TransactionOutputAdapter {
kind: TransactionCommandKind::Execute,
decoder: None,
finish: Box::new(|_| Ok(Box::new(()) as TransactionAny)),
type_name: type_name::<()>(),
},
}
}
pub(crate) fn has_returning_write(&self) -> bool {
match &self.statement {
TransactionStatement::Insert(query) => query.returning.is_some(),
TransactionStatement::Update(query) => query.returning.is_some(),
TransactionStatement::Delete(query) => query.returning.is_some(),
_ => false,
}
}
pub(crate) fn compile<C>(self, compiler: &C) -> anyhow::Result<CompiledTransactionCommand>
where
C: DinocoSqlCompiler,
{
let (sql, params) = match self.statement {
TransactionStatement::Find(query) => compiler.compile_find_query(query),
TransactionStatement::Insert(query) => compiler.compile_insert_query(query),
TransactionStatement::Update(query) => compiler.compile_update_query(query),
TransactionStatement::Delete(query) => compiler.compile_delete_query(query),
TransactionStatement::Count(query) => compiler.compile_count_query(query),
TransactionStatement::Noop => (String::new(), Vec::new()),
TransactionStatement::Invalid(message) => anyhow::bail!(message),
};
Ok(CompiledTransactionCommand {
sql,
params,
kind: self.output.kind,
decoder: self.output.decoder,
finish: self.output.finish,
type_name: self.output.type_name,
})
}
fn unit(statement: TransactionStatement) -> Self {
let finish = Box::new(|raw| {
let RawTransactionOutput::Affected(_affected) = raw else {
anyhow::bail!("Dinoco transaction write received an unexpected database result.");
};
Ok(Box::new(()) as TransactionAny)
});
Self {
statement,
output: TransactionOutputAdapter {
kind: TransactionCommandKind::Execute,
decoder: None,
finish,
type_name: type_name::<()>(),
},
}
}
fn rows<M, T, F>(statement: TransactionStatement, mapper: F) -> Self
where
M: DinocoRowModel,
T: Send + 'static,
F: FnOnce(Vec<M>) -> anyhow::Result<T> + Send + Sync + 'static,
{
let finish = Box::new(move |raw| {
let RawTransactionOutput::Rows(rows) = raw else {
anyhow::bail!("Dinoco transaction query received an unexpected database result.");
};
let rows = rows
.into_iter()
.map(|row| {
row.downcast::<M>().map(|row| *row).map_err(|_| {
anyhow::anyhow!("Dinoco could not decode a transaction row as `{}`.", type_name::<M>())
})
})
.collect::<anyhow::Result<Vec<_>>>()?;
Ok(Box::new(mapper(rows)?) as TransactionAny)
});
Self {
statement,
output: TransactionOutputAdapter {
kind: TransactionCommandKind::Rows,
decoder: Some(TransactionRowDecoder {
sqlite: decode_sqlite_row::<M>,
postgres: decode_postgres_row::<M>,
mysql: decode_mysql_row::<M>,
}),
finish,
type_name: type_name::<T>(),
},
}
}
}
impl CompiledTransactionCommand {
pub(crate) fn finish(self, raw: RawTransactionOutput) -> anyhow::Result<TransactionValue> {
Ok(TransactionValue { value: (self.finish)(raw)?, type_name: self.type_name })
}
}
fn decode_sqlite_row<M>(row: &SqliteRow<'_>) -> Option<TransactionAny>
where
M: DinocoSqlite,
{
M::from_sqlite_row(row).map(|row| Box::new(row) as TransactionAny)
}
fn decode_postgres_row<M>(row: &PostgresRow) -> Option<TransactionAny>
where
M: DinocoPostgres,
{
M::from_postgres_row(row).map(|row| Box::new(row) as TransactionAny)
}
fn decode_mysql_row<M>(row: &MysqlRow) -> Option<TransactionAny>
where
M: DinocoMysql,
{
M::from_mysql_row(row).map(|row| Box::new(row) as TransactionAny)
}