add query_raw_txt for transaction (#20)

skyzh · web-flow · commit 9011f7110db1 · 2023-07-24T15:15:14.000-04:00
Signed-off-by: Alex Chi &lt;iskyzh@gmail.com&gt;
diff --git a/tokio-postgres/src/client.rs b/tokio-postgres/src/client.rs
@@ -7,10 +7,8 @@ use crate::copy_both::CopyBothDuplex;
 use crate::copy_out::CopyOutStream;
 #[cfg(feature = "runtime")]
 use crate::keepalive::KeepaliveConfig;
-use crate::prepare::get_type;
 use crate::query::RowStream;
 use crate::simple_query::SimpleQueryStream;
-use crate::statement::Column;
 #[cfg(feature = "runtime")]
 use crate::tls::MakeTlsConnect;
 use crate::tls::TlsConnect;
@@ -22,7 +20,7 @@ use crate::{
     CopyInSink, Error, Row, SimpleQueryMessage, Statement, ToStatement, Transaction,
     TransactionBuilder,
 };
-use bytes::{Buf, BufMut, BytesMut};
+use bytes::{Buf, BytesMut};
 use fallible_iterator::FallibleIterator;
 use futures_channel::mpsc;
 use futures_util::{future, pin_mut, ready, StreamExt, TryStreamExt};
@@ -380,86 +378,11 @@ impl Client {
     /// to save a roundtrip
     pub async fn query_raw_txt<'a, S, I>(&self, query: S, params: I) -> Result<RowStream, Error>
     where
-        S: AsRef<str>,
+        S: AsRef<str> + Sync + Send,
         I: IntoIterator<Item = Option<S>>,
-        I::IntoIter: ExactSizeIterator,
+        I::IntoIter: ExactSizeIterator + Sync + Send,
     {
-        let params = params.into_iter();
-        let params_len = params.len();
-
-        let buf = self.inner.with_buf(|buf| {
-            // Parse, anonymous portal
-            frontend::parse("", query.as_ref(), std::iter::empty(), buf).map_err(Error::encode)?;
-            // Bind, pass params as text, retrieve as binary
-            match frontend::bind(
-                "",                 // empty string selects the unnamed portal
-                "",                 // empty string selects the unnamed prepared statement
-                std::iter::empty(), // all parameters use the default format (text)
-                params,
-                |param, buf| match param {
-                    Some(param) => {
-                        buf.put_slice(param.as_ref().as_bytes());
-                        Ok(postgres_protocol::IsNull::No)
-                    }
-                    None => Ok(postgres_protocol::IsNull::Yes),
-                },
-                Some(0), // all text
-                buf,
-            ) {
-                Ok(()) => Ok(()),
-                Err(frontend::BindError::Conversion(e)) => Err(Error::to_sql(e, 0)),
-                Err(frontend::BindError::Serialization(e)) => Err(Error::encode(e)),
-            }?;
-
-            // Describe portal to typecast results
-            frontend::describe(b'P', "", buf).map_err(Error::encode)?;
-            // Execute
-            frontend::execute("", 0, buf).map_err(Error::encode)?;
-            // Sync
-            frontend::sync(buf);
-
-            Ok(buf.split().freeze())
-        })?;
-
-        let mut responses = self
-            .inner
-            .send(RequestMessages::Single(FrontendMessage::Raw(buf)))?;
-
-        // now read the responses
-
-        match responses.next().await? {
-            Message::ParseComplete => {}
-            _ => return Err(Error::unexpected_message()),
-        }
-        match responses.next().await? {
-            Message::BindComplete => {}
-            _ => return Err(Error::unexpected_message()),
-        }
-        let row_description = match responses.next().await? {
-            Message::RowDescription(body) => Some(body),
-            Message::NoData => None,
-            _ => return Err(Error::unexpected_message()),
-        };
-
-        // construct statement object
-
-        let parameters = vec![Type::UNKNOWN; params_len];
-
-        let mut columns = vec![];
-        if let Some(row_description) = row_description {
-            let mut it = row_description.fields();
-            while let Some(field) = it.next().map_err(Error::parse)? {
-                // NB: for some types that function may send a query to the server. At least in
-                // raw text mode we don't need that info and can skip this.
-                let type_ = get_type(&self.inner, field.type_oid()).await?;
-                let column = Column::new(field.name().to_string(), type_, field);
-                columns.push(column);
-            }
-        }
-
-        let statement = Statement::new_text(&self.inner, "".to_owned(), parameters, columns);
-
-        Ok(RowStream::new(statement, responses))
+        query::query_txt(&self.inner, query, params).await
     }
 
     /// Executes a statement, returning the number of rows modified.
diff --git a/tokio-postgres/src/generic_client.rs b/tokio-postgres/src/generic_client.rs
@@ -56,6 +56,13 @@ pub trait GenericClient: private::Sealed {
         I: IntoIterator<Item = P> + Sync + Send,
         I::IntoIter: ExactSizeIterator;
 
+    /// Like `Client::query_raw_txt`.
+    async fn query_raw_txt<'a, S, I>(&self, query: S, params: I) -> Result<RowStream, Error>
+    where
+        S: AsRef<str> + Sync + Send,
+        I: IntoIterator<Item = Option<S>> + Sync + Send,
+        I::IntoIter: ExactSizeIterator + Sync + Send;
+
     /// Like `Client::prepare`.
     async fn prepare(&self, query: &str) -> Result<Statement, Error>;
 
@@ -133,6 +140,15 @@ impl GenericClient for Client {
         self.query_raw(statement, params).await
     }
 
+    async fn query_raw_txt<'a, S, I>(&self, query: S, params: I) -> Result<RowStream, Error>
+    where
+        S: AsRef<str> + Sync + Send,
+        I: IntoIterator<Item = Option<S>> + Sync + Send,
+        I::IntoIter: ExactSizeIterator + Sync + Send,
+    {
+        self.query_raw_txt(query, params).await
+    }
+
     async fn prepare(&self, query: &str) -> Result<Statement, Error> {
         self.prepare(query).await
     }
@@ -215,6 +231,15 @@ impl GenericClient for Transaction<'_> {
         self.query_raw(statement, params).await
     }
 
+    async fn query_raw_txt<'a, S, I>(&self, query: S, params: I) -> Result<RowStream, Error>
+    where
+        S: AsRef<str> + Sync + Send,
+        I: IntoIterator<Item = Option<S>> + Sync + Send,
+        I::IntoIter: ExactSizeIterator + Sync + Send,
+    {
+        self.query_raw_txt(query, params).await
+    }
+
     async fn prepare(&self, query: &str) -> Result<Statement, Error> {
         self.prepare(query).await
     }
diff --git a/tokio-postgres/src/query.rs b/tokio-postgres/src/query.rs
@@ -1,17 +1,21 @@
 use crate::client::{InnerClient, Responses};
 use crate::codec::FrontendMessage;
 use crate::connection::RequestMessages;
+use crate::prepare::get_type;
 use crate::types::{BorrowToSql, IsNull};
-use crate::{Error, Portal, Row, Statement};
-use bytes::{Bytes, BytesMut};
+use crate::{Column, Error, Portal, Row, Statement};
+use bytes::{BufMut, Bytes, BytesMut};
+use fallible_iterator::FallibleIterator;
 use futures_util::{ready, Stream};
 use log::{debug, log_enabled, Level};
 use pin_project_lite::pin_project;
 use postgres_protocol::message::backend::Message;
 use postgres_protocol::message::frontend;
+use postgres_types::Type;
 use std::fmt;
 use std::marker::PhantomPinned;
 use std::pin::Pin;
+use std::sync::Arc;
 use std::task::{Context, Poll};
 
 struct BorrowToSqlParamsDebug<'a, T>(&'a [T]);
@@ -57,6 +61,92 @@ where
     })
 }
 
+pub async fn query_txt<S, I>(
+    client: &Arc<InnerClient>,
+    query: S,
+    params: I,
+) -> Result<RowStream, Error>
+where
+    S: AsRef<str> + Sync + Send,
+    I: IntoIterator<Item = Option<S>>,
+    I::IntoIter: ExactSizeIterator,
+{
+    let params = params.into_iter();
+    let params_len = params.len();
+
+    let buf = client.with_buf(|buf| {
+        // Parse, anonymous portal
+        frontend::parse("", query.as_ref(), std::iter::empty(), buf).map_err(Error::encode)?;
+        // Bind, pass params as text, retrieve as binary
+        match frontend::bind(
+            "",                 // empty string selects the unnamed portal
+            "",                 // empty string selects the unnamed prepared statement
+            std::iter::empty(), // all parameters use the default format (text)
+            params,
+            |param, buf| match param {
+                Some(param) => {
+                    buf.put_slice(param.as_ref().as_bytes());
+                    Ok(postgres_protocol::IsNull::No)
+                }
+                None => Ok(postgres_protocol::IsNull::Yes),
+            },
+            Some(0), // all text
+            buf,
+        ) {
+            Ok(()) => Ok(()),
+            Err(frontend::BindError::Conversion(e)) => Err(Error::to_sql(e, 0)),
+            Err(frontend::BindError::Serialization(e)) => Err(Error::encode(e)),
+        }?;
+
+        // Describe portal to typecast results
+        frontend::describe(b'P', "", buf).map_err(Error::encode)?;
+        // Execute
+        frontend::execute("", 0, buf).map_err(Error::encode)?;
+        // Sync
+        frontend::sync(buf);
+
+        Ok(buf.split().freeze())
+    })?;
+
+    let mut responses = client.send(RequestMessages::Single(FrontendMessage::Raw(buf)))?;
+
+    // now read the responses
+
+    match responses.next().await? {
+        Message::ParseComplete => {}
+        _ => return Err(Error::unexpected_message()),
+    }
+    match responses.next().await? {
+        Message::BindComplete => {}
+        _ => return Err(Error::unexpected_message()),
+    }
+    let row_description = match responses.next().await? {
+        Message::RowDescription(body) => Some(body),
+        Message::NoData => None,
+        _ => return Err(Error::unexpected_message()),
+    };
+
+    // construct statement object
+
+    let parameters = vec![Type::UNKNOWN; params_len];
+
+    let mut columns = vec![];
+    if let Some(row_description) = row_description {
+        let mut it = row_description.fields();
+        while let Some(field) = it.next().map_err(Error::parse)? {
+            // NB: for some types that function may send a query to the server. At least in
+            // raw text mode we don't need that info and can skip this.
+            let type_ = get_type(client, field.type_oid()).await?;
+            let column = Column::new(field.name().to_string(), type_, field);
+            columns.push(column);
+        }
+    }
+
+    let statement = Statement::new_text(client, "".to_owned(), parameters, columns);
+
+    Ok(RowStream::new(statement, responses))
+}
+
 pub async fn query_portal(
     client: &InnerClient,
     portal: &Portal,
diff --git a/tokio-postgres/src/transaction.rs b/tokio-postgres/src/transaction.rs
@@ -149,6 +149,16 @@ impl<'a> Transaction<'a> {
         self.client.query_raw(statement, params).await
     }
 
+    /// Like `Client::query_raw_txt`.
+    pub async fn query_raw_txt<S, I>(&self, query: S, params: I) -> Result<RowStream, Error>
+    where
+        S: AsRef<str> + Sync + Send,
+        I: IntoIterator<Item = Option<S>>,
+        I::IntoIter: ExactSizeIterator + Sync + Send,
+    {
+        self.client.query_raw_txt(query, params).await
+    }
+
     /// Like `Client::execute`.
     pub async fn execute<T>(
         &self,
