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mod storage_impl;
pub use self::storage_impl::TiKVStorage;
use async_trait::async_trait;
use kvproto::coprocessor::{KeyRange, Response};
use protobuf::Message;
use tidb_query_common::storage::IntervalRange;
use tipb::{DagRequest, SelectResponse, StreamResponse};
use crate::coprocessor::metrics::*;
use crate::coprocessor::{Deadline, RequestHandler, Result};
use crate::storage::{Statistics, Store};
pub struct DagHandlerBuilder<S: Store + 'static> {
req: DagRequest,
ranges: Vec<KeyRange>,
store: S,
data_version: Option<u64>,
deadline: Deadline,
batch_row_limit: usize,
is_streaming: bool,
is_cache_enabled: bool,
}
impl<S: Store + 'static> DagHandlerBuilder<S> {
pub fn new(
req: DagRequest,
ranges: Vec<KeyRange>,
store: S,
deadline: Deadline,
batch_row_limit: usize,
is_streaming: bool,
is_cache_enabled: bool,
) -> Self {
DagHandlerBuilder {
req,
ranges,
store,
data_version: None,
deadline,
batch_row_limit,
is_streaming,
is_cache_enabled,
}
}
pub fn data_version(mut self, data_version: Option<u64>) -> Self {
self.data_version = data_version;
self
}
pub fn build(self) -> Result<Box<dyn RequestHandler>> {
COPR_DAG_REQ_COUNT.with_label_values(&["batch"]).inc();
Ok(BatchDAGHandler::new(
self.req,
self.ranges,
self.store,
self.data_version,
self.deadline,
self.is_cache_enabled,
self.batch_row_limit,
self.is_streaming,
)?
.into_boxed())
}
}
pub struct BatchDAGHandler {
runner: tidb_query_executors::runner::BatchExecutorsRunner<Statistics>,
data_version: Option<u64>,
}
impl BatchDAGHandler {
pub fn new<S: Store + 'static>(
req: DagRequest,
ranges: Vec<KeyRange>,
store: S,
data_version: Option<u64>,
deadline: Deadline,
is_cache_enabled: bool,
streaming_batch_limit: usize,
is_streaming: bool,
) -> Result<Self> {
Ok(Self {
runner: tidb_query_executors::runner::BatchExecutorsRunner::from_request(
req,
ranges,
TiKVStorage::new(store, is_cache_enabled),
deadline,
streaming_batch_limit,
is_streaming,
)?,
data_version,
})
}
}
#[async_trait]
impl RequestHandler for BatchDAGHandler {
async fn handle_request(&mut self) -> Result<Response> {
let result = self.runner.handle_request().await;
handle_qe_response(result, self.runner.can_be_cached(), self.data_version)
}
fn handle_streaming_request(&mut self) -> Result<(Option<Response>, bool)> {
handle_qe_stream_response(self.runner.handle_streaming_request())
}
fn collect_scan_statistics(&mut self, dest: &mut Statistics) {
self.runner.collect_storage_stats(dest);
}
}
fn handle_qe_response(
result: tidb_query_common::Result<SelectResponse>,
can_be_cached: bool,
data_version: Option<u64>,
) -> Result<Response> {
use tidb_query_common::error::ErrorInner;
match result {
Ok(sel_resp) => {
let mut resp = Response::default();
resp.set_data(box_try!(sel_resp.write_to_bytes()));
resp.set_can_be_cached(can_be_cached);
resp.set_is_cache_hit(false);
if let Some(v) = data_version {
resp.set_cache_last_version(v);
}
Ok(resp)
}
Err(err) => match *err.0 {
ErrorInner::Storage(err) => Err(err.into()),
ErrorInner::Evaluate(err) => {
let mut resp = Response::default();
let mut sel_resp = SelectResponse::default();
sel_resp.mut_error().set_code(err.code());
sel_resp.mut_error().set_msg(err.to_string());
resp.set_data(box_try!(sel_resp.write_to_bytes()));
resp.set_can_be_cached(can_be_cached);
resp.set_is_cache_hit(false);
Ok(resp)
}
},
}
}
fn handle_qe_stream_response(
result: tidb_query_common::Result<(Option<(StreamResponse, IntervalRange)>, bool)>,
) -> Result<(Option<Response>, bool)> {
use tidb_query_common::error::ErrorInner;
match result {
Ok((Some((s_resp, range)), finished)) => {
let mut resp = Response::default();
resp.set_data(box_try!(s_resp.write_to_bytes()));
resp.mut_range().set_start(range.lower_inclusive);
resp.mut_range().set_end(range.upper_exclusive);
Ok((Some(resp), finished))
}
Ok((None, finished)) => Ok((None, finished)),
Err(err) => match *err.0 {
ErrorInner::Storage(err) => Err(err.into()),
ErrorInner::Evaluate(err) => {
let mut resp = Response::default();
let mut s_resp = StreamResponse::default();
s_resp.mut_error().set_code(err.code());
s_resp.mut_error().set_msg(err.to_string());
resp.set_data(box_try!(s_resp.write_to_bytes()));
Ok((Some(resp), true))
}
},
}
}