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1d642d6a57
Our rust-postgres fork is getting messy. Mostly because proxy wants more
control over the raw protocol than tokio-postgres provides. As such,
it's diverging more and more. Storage and compute also make use of
rust-postgres, but in more normal usage, thus they don't need our crazy
changes.
Idea:
* proxy maintains their subset
* other teams use a minimal patch set against upstream rust-postgres
Reviewing this code will be difficult. To implement it, I
1. Copied tokio-postgres, postgres-protocol and postgres-types from
00940fcdb5
2. Updated their package names with the `2` suffix to make them compile
in the workspace.
3. Updated proxy to use those packages
4. Copied in the code from tokio-postgres-rustls 0.13 (with some patches
applied https://github.com/jbg/tokio-postgres-rustls/pull/32
https://github.com/jbg/tokio-postgres-rustls/pull/33)
5. Removed as much dead code as I could find in the vendored libraries
6. Updated the tokio-postgres-rustls code to use our existing channel
binding implementation
75 lines
2.3 KiB
Rust
75 lines
2.3 KiB
Rust
use crate::codec::FrontendMessage;
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use crate::connection::RequestMessages;
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use crate::query::RowStream;
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use crate::{CancelToken, Client, Error, ReadyForQueryStatus};
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use postgres_protocol2::message::frontend;
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/// A representation of a PostgreSQL database transaction.
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///
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/// Transactions will implicitly roll back when dropped. Use the `commit` method to commit the changes made in the
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/// transaction. Transactions can be nested, with inner transactions implemented via safepoints.
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pub struct Transaction<'a> {
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client: &'a mut Client,
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done: bool,
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}
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impl Drop for Transaction<'_> {
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fn drop(&mut self) {
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if self.done {
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return;
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}
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let buf = self.client.inner().with_buf(|buf| {
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frontend::query("ROLLBACK", buf).unwrap();
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buf.split().freeze()
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});
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let _ = self
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.client
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.inner()
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.send(RequestMessages::Single(FrontendMessage::Raw(buf)));
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}
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}
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impl<'a> Transaction<'a> {
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pub(crate) fn new(client: &'a mut Client) -> Transaction<'a> {
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Transaction {
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client,
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done: false,
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}
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}
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/// Consumes the transaction, committing all changes made within it.
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pub async fn commit(mut self) -> Result<ReadyForQueryStatus, Error> {
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self.done = true;
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self.client.batch_execute("COMMIT").await
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}
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/// Rolls the transaction back, discarding all changes made within it.
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///
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/// This is equivalent to `Transaction`'s `Drop` implementation, but provides any error encountered to the caller.
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pub async fn rollback(mut self) -> Result<ReadyForQueryStatus, Error> {
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self.done = true;
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self.client.batch_execute("ROLLBACK").await
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}
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/// Like `Client::query_raw_txt`.
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pub async fn query_raw_txt<S, I>(&self, statement: &str, params: I) -> Result<RowStream, Error>
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where
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S: AsRef<str>,
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I: IntoIterator<Item = Option<S>>,
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I::IntoIter: ExactSizeIterator,
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{
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self.client.query_raw_txt(statement, params).await
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}
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/// Like `Client::cancel_token`.
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pub fn cancel_token(&self) -> CancelToken {
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self.client.cancel_token()
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}
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/// Returns a reference to the underlying `Client`.
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pub fn client(&self) -> &Client {
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self.client
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}
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}
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