Merge pull request #52 from GiGainfosystems/multiconnection_work

Multiconnection fixes

Author: weiznich

Cargo.toml

@@ -54,4 +54,4 @@ dynamic-schema = ["diesel-dynamic-schema"]
 gst = []
 
 [patch.crates-io]
-diesel = { git = "https://github.com/weiznich/diesel", rev = "e632a7ca4fa12b76d7638392aeaff7522f57adef" }
+diesel = { git = "https://github.com/weiznich/diesel", rev = "548e0d73a0f2c207f1abf03f8f6741f5a9b1cb0b" }

src/oracle/connection/bind_collector.rs

@@ -70,6 +70,16 @@ impl<'a> BindCollector<'a, Oracle> for OracleBindCollector<'a> {
 
         Ok(())
     }
+
+    fn push_null_value(
+        &mut self,
+        metadata: <Oracle as diesel::sql_types::TypeMetadata>::TypeMetadata,
+    ) -> diesel::prelude::QueryResult<()> {
+        let len = self.binds.len();
+        self.binds
+            .push((format!("in{}", len), BindValue::NotSet(metadata.tpe)));
+        Ok(())
+    }
 }
 
 impl<'a, T> From<T> for BindValue<'a>

src/oracle/connection/mod.rs

@@ -9,6 +9,8 @@ use super::backend::Oracle;
 use super::query_builder::OciQueryBuilder;
 use super::OciDataType;
 use crate::oracle::connection::stmt_iter::RowIter;
+use diesel::connection::Instrumentation;
+use diesel::connection::InstrumentationEvent;
 use diesel::connection::{Connection, SimpleConnection, TransactionManager};
 use diesel::connection::{LoadConnection, MultiConnectionHelper};
 use diesel::deserialize::FromSql;
@@ -146,6 +148,7 @@ mod transaction;
 pub struct OciConnection {
     raw: oracle::Connection,
     transaction_manager: OCITransactionManager,
+    instrumentation: Option<Box<dyn Instrumentation>>,
 }
 
 struct ErrorHelper(oracle::Error);
@@ -238,8 +241,23 @@ unsafe impl Send for OciConnection {}
 
 impl SimpleConnection for OciConnection {
     fn batch_execute(&mut self, query: &str) -> QueryResult<()> {
-        self.raw.execute(query, &[]).map_err(ErrorHelper::from)?;
-        Ok(())
+        self.instrumentation
+            .on_connection_event(InstrumentationEvent::start_query(
+                &diesel::connection::StrQueryHelper::new(query),
+            ));
+        let r = self
+            .raw
+            .execute(query, &[])
+            .map_err(ErrorHelper::from)
+            .map_err(Into::into)
+            .map(|_| ());
+        self.instrumentation
+            .on_connection_event(InstrumentationEvent::finish_query(
+                &diesel::connection::StrQueryHelper::new(query),
+                r.as_ref().err(),
+            ));
+
+        r
     }
 }
 
@@ -251,54 +269,20 @@ impl Connection for OciConnection {
     /// should be a valid connection string for a given backend. See the
     /// documentation for the specific backend for specifics.
     fn establish(database_url: &str) -> ConnectionResult<Self> {
-        let url = url::Url::parse(database_url)
-            .map_err(|_| ConnectionError::InvalidConnectionUrl("Invalid url".into()))?;
-        if url.scheme() != "oracle" {
-            return Err(ConnectionError::InvalidConnectionUrl(format!(
-                "Got a unsupported url scheme: {}",
-                url.scheme()
-            )));
-        }
-        let user = url.username();
-
-        if user.is_empty() {
-            return Err(ConnectionError::InvalidConnectionUrl(
-                "Username not set".into(),
-            ));
-        }
-        let user = match percent_encoding::percent_decode_str(url.username()).decode_utf8() {
-            Ok(username) => username,
-            Err(_e) => {
-                return Err(ConnectionError::InvalidConnectionUrl(
-                    "Username could not be percent decoded".into(),
-                ))
-            }
-        };
-        let password = url
-            .password()
-            .ok_or_else(|| ConnectionError::InvalidConnectionUrl("Password not set".into()))?;
-
-        let host = url
-            .host_str()
-            .ok_or_else(|| ConnectionError::InvalidConnectionUrl("Hostname not set".into()))?;
-        let port = url.port();
-        let path = url.path();
-
-        let mut url = host.to_owned();
-        if let Some(port) = port {
-            write!(url, ":{}", port).expect("Write to string does not fail");
-        }
-        url += path;
-
-        let mut raw = oracle::Connection::connect(user, password, url)
-            .map_err(ErrorHelper::from)
-            .map_err(|e| ConnectionError::CouldntSetupConfiguration(e.into()))?;
-
-        raw.set_autocommit(true);
+        let mut instrumentation = diesel::connection::get_default_instrumentation();
+        instrumentation.on_connection_event(InstrumentationEvent::start_establish_connection(
+            database_url,
+        ));
+        let raw = Self::inner_establish(database_url);
+        instrumentation.on_connection_event(InstrumentationEvent::finish_establish_connection(
+            database_url,
+            raw.as_ref().err(),
+        ));
 
         Ok(Self {
-            raw,
+            raw: raw?,
             transaction_manager: OCITransactionManager::new(),
+            instrumentation,
         })
     }
 
@@ -307,35 +291,17 @@ impl Connection for OciConnection {
     where
         T: QueryFragment<Self::Backend> + QueryId,
     {
-        let mut qb = OciQueryBuilder::default();
-
-        source.to_sql(&mut qb, &Oracle)?;
-
-        let conn = &self.raw;
-        let sql = qb.finish();
-        let mut stmt = conn.statement(&sql);
-        if !source.is_safe_to_cache_prepared(&Oracle)? {
-            stmt.exclude_from_cache();
-        }
-        let mut stmt = stmt.build().map_err(ErrorHelper::from)?;
-        let mut bind_collector = OracleBindCollector::default();
-
-        source.collect_binds(&mut bind_collector, &mut (), &Oracle)?;
-        let binds = bind_collector
-            .binds
-            .iter()
-            .map(|(n, b)| -> (&str, &dyn oracle::sql_type::ToSql) {
-                (n as &str, std::ops::Deref::deref(b))
-            })
-            .collect::<Vec<_>>();
-
-        if stmt.is_query() {
-            stmt.query_named(&binds).map_err(ErrorHelper::from)?;
-        } else {
-            stmt.execute_named(&binds).map_err(ErrorHelper::from)?;
-        }
-
-        Ok(stmt.row_count().map_err(ErrorHelper::from)? as usize)
+        self.instrumentation
+            .on_connection_event(InstrumentationEvent::start_query(&diesel::debug_query(
+                source,
+            )));
+        let res = self.inner_executing_returning_count(source);
+        self.instrumentation
+            .on_connection_event(InstrumentationEvent::finish_query(
+                &diesel::debug_query(source),
+                res.as_ref().err(),
+            ));
+        res
     }
 
     fn transaction_state(
@@ -357,6 +323,14 @@ impl Connection for OciConnection {
         self.transaction_manager.is_test_transaction = true;
         Ok(())
     }
+
+    fn instrumentation(&mut self) -> &mut dyn diesel::connection::Instrumentation {
+        &mut self.instrumentation
+    }
+
+    fn set_instrumentation(&mut self, instrumentation: impl diesel::connection::Instrumentation) {
+        self.instrumentation = Some(Box::new(instrumentation));
+    }
 }
 
 impl LoadConnection for OciConnection {
@@ -370,8 +344,11 @@ impl LoadConnection for OciConnection {
         Self::Backend: QueryMetadata<T::SqlType>,
     {
         let query = source.as_query();
-
-        self.with_prepared_statement(query, |mut stmt, bind_collector| {
+        self.instrumentation
+            .on_connection_event(InstrumentationEvent::start_query(&diesel::debug_query(
+                &query,
+            )));
+        let res = self.with_prepared_statement(&query, |mut stmt, bind_collector| {
             if stmt.is_query() {
                 let binds = bind_collector
                     .binds
@@ -394,7 +371,13 @@ impl LoadConnection for OciConnection {
             } else {
                 unreachable!()
             }
-        })
+        });
+        self.instrumentation
+            .on_connection_event(InstrumentationEvent::finish_query(
+                &diesel::debug_query(&query),
+                res.as_ref().err(),
+            ));
+        res
     }
 }
 
@@ -421,7 +404,7 @@ where
 impl OciConnection {
     fn with_prepared_statement<'conn, 'query, T, R>(
         &'conn mut self,
-        query: T,
+        query: &T,
         callback: impl FnOnce(oracle::Statement<'conn>, OracleBindCollector) -> QueryResult<R>,
     ) -> Result<R, Error>
     where
@@ -632,36 +615,131 @@ impl OciConnection {
         });
 
         if let Some(first_record) = record_iter.next() {
-            let mut qb = OciQueryBuilder::default();
-            first_record.to_sql(&mut qb, &Oracle)?;
-            let query_string = qb.finish();
-            let mut batch = self
-                .raw
-                .batch(&query_string, record_count)
-                .build()
-                .map_err(ErrorHelper::from)?;
+            self.instrumentation
+                .on_connection_event(InstrumentationEvent::start_query(&diesel::debug_query(
+                    &first_record,
+                )));
+            let res = self.inner_batch_insert(&first_record, record_count, record_iter);
+            self.instrumentation
+                .on_connection_event(InstrumentationEvent::finish_query(
+                    &diesel::debug_query(&first_record),
+                    res.as_ref().err(),
+                ));
+            res
+        } else {
+            Ok(0)
+        }
+    }
+
+    fn inner_batch_insert<Q>(
+        &mut self,
+        first_record: &Q,
+        record_count: usize,
+        record_iter: impl Iterator<Item = Q>,
+    ) -> Result<usize, Error>
+    where
+        Q: QueryFragment<Oracle>,
+    {
+        let mut qb = OciQueryBuilder::default();
+        first_record.to_sql(&mut qb, &Oracle)?;
+        let query_string = qb.finish();
+        let mut batch = self
+            .raw
+            .batch(&query_string, record_count)
+            .build()
+            .map_err(ErrorHelper::from)?;
+
+        bind_params_to_batch(first_record, &mut batch)?;
+        for record in record_iter {
+            bind_params_to_batch(&record, &mut batch)?;
+        }
+        batch.execute().map_err(ErrorHelper::from)?;
+        Ok(record_count)
+    }
 
-            bind_params_to_batch(first_record, &mut batch)?;
-            for record in record_iter {
-                bind_params_to_batch(record, &mut batch)?;
+    fn inner_establish(database_url: &str) -> Result<oracle::Connection, ConnectionError> {
+        let url = url::Url::parse(database_url)
+            .map_err(|_| ConnectionError::InvalidConnectionUrl("Invalid url".into()))?;
+        if url.scheme() != "oracle" {
+            return Err(ConnectionError::InvalidConnectionUrl(format!(
+                "Got a unsupported url scheme: {}",
+                url.scheme()
+            )));
+        }
+        let user = url.username();
+        if user.is_empty() {
+            return Err(ConnectionError::InvalidConnectionUrl(
+                "Username not set".into(),
+            ));
+        }
+        let user = match percent_encoding::percent_decode_str(url.username()).decode_utf8() {
+            Ok(username) => username,
+            Err(_e) => {
+                return Err(ConnectionError::InvalidConnectionUrl(
+                    "Username could not be percent decoded".into(),
+                ))
             }
-            batch.execute().map_err(ErrorHelper::from)?;
-            Ok(record_count)
+        };
+        let password = url
+            .password()
+            .ok_or_else(|| ConnectionError::InvalidConnectionUrl("Password not set".into()))?;
+        let host = url
+            .host_str()
+            .ok_or_else(|| ConnectionError::InvalidConnectionUrl("Hostname not set".into()))?;
+        let port = url.port();
+        let path = url.path();
+        let mut url = host.to_owned();
+        if let Some(port) = port {
+            write!(url, ":{}", port).expect("Write to string does not fail");
+        }
+        url += path;
+        let mut raw = oracle::Connection::connect(user, password, url)
+            .map_err(ErrorHelper::from)
+            .map_err(|e| ConnectionError::CouldntSetupConfiguration(e.into()))?;
+        raw.set_autocommit(true);
+        Ok(raw)
+    }
+
+    fn inner_executing_returning_count<T>(&mut self, source: &T) -> Result<usize, Error>
+    where
+        T: QueryFragment<Oracle> + QueryId,
+    {
+        let mut qb = OciQueryBuilder::default();
+
+        source.to_sql(&mut qb, &Oracle)?;
+
+        let conn = &self.raw;
+        let sql = qb.finish();
+        let mut stmt = conn.statement(&sql);
+        if !source.is_safe_to_cache_prepared(&Oracle)? {
+            stmt.exclude_from_cache();
+        }
+        let mut stmt = stmt.build().map_err(ErrorHelper::from)?;
+        let mut bind_collector = OracleBindCollector::default();
+
+        source.collect_binds(&mut bind_collector, &mut (), &Oracle)?;
+        let binds = bind_collector
+            .binds
+            .iter()
+            .map(|(n, b)| -> (&str, &dyn oracle::sql_type::ToSql) {
+                (n as &str, std::ops::Deref::deref(b))
+            })
+            .collect::<Vec<_>>();
+
+        if stmt.is_query() {
+            stmt.query_named(&binds).map_err(ErrorHelper::from)?;
         } else {
-            Ok(0)
+            stmt.execute_named(&binds).map_err(ErrorHelper::from)?;
         }
+
+        Ok(stmt.row_count().map_err(ErrorHelper::from)? as usize)
     }
 }
 
-fn bind_params_to_batch<'a, T, V, Op>(
-    record: InsertStatement<T, &'a ValuesClause<V, T>, Op>,
+fn bind_params_to_batch(
+    record: &impl QueryFragment<Oracle>,
     batch: &mut oracle::Batch,
-) -> Result<(), Error>
-where
-    T: Table + 'a,
-    V: 'a,
-    InsertStatement<T, &'a ValuesClause<V, T>, Op>: QueryFragment<Oracle>,
-{
+) -> Result<(), Error> {
     let mut bind_collector = OracleBindCollector::default();
     record.collect_binds(&mut bind_collector, &mut (), &Oracle)?;
     let binds = bind_collector