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use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use std::sync::atomic::{AtomicUsize, Ordering};
use arrow::array::Array as ArrowArray;
use llkv_runtime::{RuntimeContext, RuntimeStatementResult};
use llkv_sql::SqlEngine;
use llkv_storage::pager::MemPager;
use sqllogictest::{AsyncDB, DBOutput, DefaultColumnType};
pub struct EngineHarness {
engine: SqlEngine<MemPager>,
}
impl EngineHarness {
pub fn new(engine: SqlEngine<MemPager>) -> Self {
let harness = Self { engine };
tracing::debug!("[HARNESS] new() created harness at {:p}", &harness);
harness
}
}
#[derive(Clone)]
pub struct SharedContext {
context: Arc<RuntimeContext<MemPager>>,
}
impl Default for SharedContext {
fn default() -> Self {
Self::new()
}
}
impl SharedContext {
pub fn new() -> Self {
let pager = Arc::new(MemPager::default());
let context = Arc::new(RuntimeContext::new(pager));
Self { context }
}
pub fn make_engine(&self) -> SqlEngine<MemPager> {
SqlEngine::with_context(Arc::clone(&self.context), false)
}
}
#[async_trait::async_trait]
impl AsyncDB for EngineHarness {
type Error = llkv_result::Error;
type ColumnType = DefaultColumnType;
async fn run(&mut self, sql: &str) -> Result<DBOutput<Self::ColumnType>, Self::Error> {
// Log which SQL is being executed by this harness
tracing::debug!("[HARNESS {:p}] run() called, sql=\"{}\"", self, sql.trim());
match self.engine.execute(sql) {
Ok(mut results) => {
tracing::trace!(
"[HARNESS] execute() returned Ok with {} results",
results.len()
);
if results.is_empty() {
return Ok(DBOutput::StatementComplete(0));
}
let result = results.remove(0);
match result {
RuntimeStatementResult::Select { execution, .. } => {
let batches = execution.collect()?;
let mut rows: Vec<Vec<String>> = Vec::new();
for batch in &batches {
for row_idx in 0..batch.num_rows() {
let mut row: Vec<String> = Vec::new();
for col in 0..batch.num_columns() {
let array = batch.column(col);
let val = match array.data_type() {
arrow::datatypes::DataType::Int64 => {
let a = array
.as_any()
.downcast_ref::<arrow::array::Int64Array>()
.unwrap();
if a.is_null(row_idx) {
"NULL".to_string()
} else {
a.value(row_idx).to_string()
}
}
arrow::datatypes::DataType::UInt64 => {
let a = array
.as_any()
.downcast_ref::<arrow::array::UInt64Array>()
.unwrap();
if a.is_null(row_idx) {
"NULL".to_string()
} else {
a.value(row_idx).to_string()
}
}
arrow::datatypes::DataType::Float64 => {
let a = array
.as_any()
.downcast_ref::<arrow::array::Float64Array>()
.unwrap();
if a.is_null(row_idx) {
"NULL".to_string()
} else {
a.value(row_idx).to_string()
}
}
arrow::datatypes::DataType::Utf8 => {
let a = array
.as_any()
.downcast_ref::<arrow::array::StringArray>()
.unwrap();
if a.is_null(row_idx) {
"NULL".to_string()
} else {
a.value(row_idx).to_string()
}
}
_ => "".to_string(),
};
row.push(val);
}
rows.push(row);
}
}
let types = if let Some(first) = batches.first() {
(0..first.num_columns())
.map(|col| match first.column(col).data_type() {
arrow::datatypes::DataType::Int64
| arrow::datatypes::DataType::UInt64 => {
DefaultColumnType::Integer
}
arrow::datatypes::DataType::Float64 => {
DefaultColumnType::FloatingPoint
}
arrow::datatypes::DataType::Utf8 => DefaultColumnType::Text,
_ => DefaultColumnType::Any,
})
.collect()
} else {
vec![]
};
Ok(DBOutput::Rows { types, rows })
}
RuntimeStatementResult::Insert { rows_inserted, .. } => {
// Return as a single-row result for compatibility with query directives
Ok(DBOutput::Rows {
types: vec![DefaultColumnType::Integer],
rows: vec![vec![rows_inserted.to_string()]],
})
}
RuntimeStatementResult::Update { rows_updated, .. } => {
// Return as a single-row result for compatibility with query directives
Ok(DBOutput::Rows {
types: vec![DefaultColumnType::Integer],
rows: vec![vec![rows_updated.to_string()]],
})
}
RuntimeStatementResult::Delete { rows_deleted, .. } => {
// Return as a single-row result for compatibility with query directives
Ok(DBOutput::Rows {
types: vec![DefaultColumnType::Integer],
rows: vec![vec![rows_deleted.to_string()]],
})
}
RuntimeStatementResult::CreateTable { .. } => {
Ok(DBOutput::StatementComplete(0))
}
RuntimeStatementResult::Transaction { .. } => {
Ok(DBOutput::StatementComplete(0))
}
RuntimeStatementResult::NoOp => Ok(DBOutput::StatementComplete(0)),
}
}
Err(e) => {
tracing::trace!("[HARNESS] execute() returned Err: {:?}", e);
Err(e)
}
}
}
async fn shutdown(&mut self) {}
}
pub type HarnessFuture = Pin<Box<dyn Future<Output = Result<EngineHarness, ()>> + Send + 'static>>;
pub type HarnessFactory = Box<dyn Fn() -> HarnessFuture + Send + Sync + 'static>;
pub fn make_factory_factory() -> impl Fn() -> HarnessFactory + Clone {
|| {
tracing::trace!("[FACTORY] make_factory_factory: Creating SharedContext");
let shared = SharedContext::new();
let counter = Arc::new(AtomicUsize::new(0));
let factory: HarnessFactory = Box::new(move || {
let n = counter.fetch_add(1, Ordering::SeqCst);
tracing::debug!(
"[FACTORY] Factory called #{}: Creating new EngineHarness",
n
);
let shared_clone = shared.clone();
Box::pin(async move {
let engine = shared_clone.make_engine();
tracing::debug!(
"[FACTORY] Factory #{}: Created SqlEngine with new Session",
n
);
Ok::<_, ()>(EngineHarness::new(engine))
})
});
factory
}
}