2019-07-25 02:18:15 +00:00
|
|
|
use crate::client::{InnerClient, Responses};
|
|
|
|
use crate::codec::FrontendMessage;
|
|
|
|
use crate::connection::RequestMessages;
|
|
|
|
use crate::types::{IsNull, ToSql};
|
|
|
|
use crate::{Error, Row, Statement};
|
2019-07-29 00:48:32 +00:00
|
|
|
use futures::{ready, Stream, TryFutureExt};
|
2019-07-25 02:18:15 +00:00
|
|
|
use postgres_protocol::message::backend::Message;
|
|
|
|
use postgres_protocol::message::frontend;
|
|
|
|
use std::pin::Pin;
|
|
|
|
use std::sync::Arc;
|
|
|
|
use std::task::{Context, Poll};
|
|
|
|
|
2019-07-29 00:48:32 +00:00
|
|
|
pub fn query(
|
2019-07-25 02:18:15 +00:00
|
|
|
client: Arc<InnerClient>,
|
2019-07-27 03:11:34 +00:00
|
|
|
statement: Statement,
|
|
|
|
buf: Result<Vec<u8>, Error>,
|
2019-07-29 00:48:32 +00:00
|
|
|
) -> impl Stream<Item = Result<Row, Error>> {
|
|
|
|
start(client, buf)
|
|
|
|
.map_ok(|responses| Query {
|
|
|
|
statement,
|
|
|
|
responses,
|
|
|
|
})
|
|
|
|
.try_flatten_stream()
|
2019-07-25 02:18:15 +00:00
|
|
|
}
|
|
|
|
|
2019-07-27 03:11:34 +00:00
|
|
|
pub async fn execute(client: Arc<InnerClient>, buf: Result<Vec<u8>, Error>) -> Result<u64, Error> {
|
|
|
|
let mut responses = start(client, buf).await?;
|
2019-07-25 02:18:15 +00:00
|
|
|
|
|
|
|
loop {
|
|
|
|
match responses.next().await? {
|
|
|
|
Message::DataRow(_) => {}
|
|
|
|
Message::CommandComplete(body) => {
|
|
|
|
let rows = body
|
|
|
|
.tag()
|
|
|
|
.map_err(Error::parse)?
|
|
|
|
.rsplit(' ')
|
|
|
|
.next()
|
|
|
|
.unwrap()
|
|
|
|
.parse()
|
|
|
|
.unwrap_or(0);
|
|
|
|
return Ok(rows);
|
|
|
|
}
|
|
|
|
Message::EmptyQueryResponse => return Ok(0),
|
|
|
|
_ => return Err(Error::unexpected_message()),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2019-07-27 03:11:34 +00:00
|
|
|
async fn start(client: Arc<InnerClient>, buf: Result<Vec<u8>, Error>) -> Result<Responses, Error> {
|
|
|
|
let buf = buf?;
|
|
|
|
let mut responses = client.send(RequestMessages::Single(FrontendMessage::Raw(buf)))?;
|
|
|
|
|
|
|
|
match responses.next().await? {
|
|
|
|
Message::BindComplete => {}
|
|
|
|
_ => return Err(Error::unexpected_message()),
|
|
|
|
}
|
|
|
|
|
|
|
|
Ok(responses)
|
|
|
|
}
|
|
|
|
|
|
|
|
pub fn encode<'a, I>(statement: &Statement, params: I) -> Result<Vec<u8>, Error>
|
2019-07-25 02:18:15 +00:00
|
|
|
where
|
|
|
|
I: IntoIterator<Item = &'a dyn ToSql>,
|
|
|
|
I::IntoIter: ExactSizeIterator,
|
|
|
|
{
|
|
|
|
let params = params.into_iter();
|
|
|
|
|
|
|
|
assert!(
|
|
|
|
statement.params().len() == params.len(),
|
|
|
|
"expected {} parameters but got {}",
|
|
|
|
statement.params().len(),
|
|
|
|
params.len()
|
|
|
|
);
|
|
|
|
|
|
|
|
let mut buf = vec![];
|
|
|
|
|
|
|
|
let mut error_idx = 0;
|
|
|
|
let r = frontend::bind(
|
|
|
|
"",
|
|
|
|
statement.name(),
|
|
|
|
Some(1),
|
|
|
|
params.zip(statement.params()).enumerate(),
|
|
|
|
|(idx, (param, ty)), buf| match param.to_sql_checked(ty, buf) {
|
|
|
|
Ok(IsNull::No) => Ok(postgres_protocol::IsNull::No),
|
|
|
|
Ok(IsNull::Yes) => Ok(postgres_protocol::IsNull::Yes),
|
|
|
|
Err(e) => {
|
|
|
|
error_idx = idx;
|
|
|
|
Err(e)
|
|
|
|
}
|
|
|
|
},
|
|
|
|
Some(1),
|
|
|
|
&mut buf,
|
|
|
|
);
|
|
|
|
match r {
|
|
|
|
Ok(()) => {}
|
|
|
|
Err(frontend::BindError::Conversion(e)) => return Err(Error::to_sql(e, error_idx)),
|
|
|
|
Err(frontend::BindError::Serialization(e)) => return Err(Error::encode(e)),
|
|
|
|
}
|
|
|
|
|
|
|
|
frontend::execute("", 0, &mut buf).map_err(Error::encode)?;
|
|
|
|
frontend::sync(&mut buf);
|
|
|
|
|
2019-07-27 03:11:34 +00:00
|
|
|
Ok(buf)
|
2019-07-25 02:18:15 +00:00
|
|
|
}
|
|
|
|
|
2019-07-29 00:48:32 +00:00
|
|
|
struct Query {
|
2019-07-25 02:18:15 +00:00
|
|
|
statement: Statement,
|
|
|
|
responses: Responses,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl Stream for Query {
|
|
|
|
type Item = Result<Row, Error>;
|
|
|
|
|
|
|
|
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
|
|
|
|
match ready!(self.responses.poll_next(cx)?) {
|
|
|
|
Message::DataRow(body) => {
|
|
|
|
Poll::Ready(Some(Ok(Row::new(self.statement.clone(), body)?)))
|
|
|
|
}
|
|
|
|
Message::EmptyQueryResponse | Message::CommandComplete(_) => Poll::Ready(None),
|
|
|
|
Message::ErrorResponse(body) => Poll::Ready(Some(Err(Error::db(body)))),
|
|
|
|
_ => Poll::Ready(Some(Err(Error::unexpected_message()))),
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|