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