Garage v1.0 #683
2 changed files with 47 additions and 25 deletions
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@ -3,6 +3,7 @@ use core::ptr::NonNull;
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use std::collections::HashMap;
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use std::convert::TryInto;
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use std::pin::Pin;
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use std::sync::{Arc, RwLock};
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use heed::types::ByteSlice;
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@ -319,12 +320,20 @@ where
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where
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F: FnOnce(&'a RoTxn<'a>) -> Result<I>,
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{
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let mut res = TxAndIterator { tx, iter: None };
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let res = TxAndIterator { tx, iter: None };
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let mut boxed = Box::pin(res);
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let tx = unsafe { NonNull::from(&res.tx).as_ref() };
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res.iter = Some(iterfun(tx)?);
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// This unsafe allows us to bypass lifetime checks
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let tx = unsafe { NonNull::from(&boxed.tx).as_ref() };
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let iter = iterfun(tx)?;
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Ok(Box::new(res))
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let mut_ref = Pin::as_mut(&mut boxed);
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// This unsafe allows us to write in a field of the pinned struct
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unsafe {
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Pin::get_unchecked_mut(mut_ref).iter = Some(iter);
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}
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Ok(Box::new(TxAndIteratorPin(boxed)))
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}
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}
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@ -338,14 +347,21 @@ where
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}
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}
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impl<'a, I> Iterator for TxAndIterator<'a, I>
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struct TxAndIteratorPin<'a, I>(Pin<Box<TxAndIterator<'a, I>>>)
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where
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I: Iterator<Item = IteratorItem<'a>> + 'a;
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impl<'a, I> Iterator for TxAndIteratorPin<'a, I>
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where
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I: Iterator<Item = IteratorItem<'a>> + 'a,
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{
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type Item = Result<(Value, Value)>;
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fn next(&mut self) -> Option<Self::Item> {
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match self.iter.as_mut().unwrap().next() {
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let mut_ref = Pin::as_mut(&mut self.0);
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// This unsafe allows us to mutably access the iterator field
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let next = unsafe { Pin::get_unchecked_mut(mut_ref).iter.as_mut()?.next() };
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match next {
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None => None,
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Some(Err(e)) => Some(Err(e.into())),
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Some(Ok((k, v))) => Some(Ok((k.to_vec(), v.to_vec()))),
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@ -444,17 +444,23 @@ impl<'a> DbValueIterator<'a> {
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let mut boxed = Box::pin(res);
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trace!("make iterator with sql: {}", sql);
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// This unsafe allows us to bypass lifetime checks
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let db = unsafe { NonNull::from(&boxed.db).as_ref() };
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let stmt = db.db.prepare(sql)?;
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let mut_ref = Pin::as_mut(&mut boxed);
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// This unsafe allows us to write in a field of the pinned struct
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unsafe {
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let db = NonNull::from(&boxed.db);
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let stmt = db.as_ref().db.prepare(sql)?;
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let mut_ref: Pin<&mut DbValueIterator<'a>> = Pin::as_mut(&mut boxed);
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Pin::get_unchecked_mut(mut_ref).stmt = Some(stmt);
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}
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let mut stmt = NonNull::from(&boxed.stmt);
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let iter = stmt.as_mut().as_mut().unwrap().query(args)?;
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// This unsafe allows us to bypass lifetime checks
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let stmt = unsafe { NonNull::from(&boxed.stmt).as_mut() };
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let iter = stmt.as_mut().unwrap().query(args)?;
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let mut_ref: Pin<&mut DbValueIterator<'a>> = Pin::as_mut(&mut boxed);
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let mut_ref = Pin::as_mut(&mut boxed);
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// This unsafe allows us to write in a field of the pinned struct
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unsafe {
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Pin::get_unchecked_mut(mut_ref).iter = Some(iter);
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}
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@ -476,10 +482,9 @@ impl<'a> Iterator for DbValueIteratorPin<'a> {
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type Item = Result<(Value, Value)>;
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fn next(&mut self) -> Option<Self::Item> {
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let next = unsafe {
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let mut_ref: Pin<&mut DbValueIterator<'a>> = Pin::as_mut(&mut self.0);
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Pin::get_unchecked_mut(mut_ref).iter.as_mut()?.next()
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};
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let mut_ref = Pin::as_mut(&mut self.0);
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// This unsafe allows us to mutably access the iterator field
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let next = unsafe { Pin::get_unchecked_mut(mut_ref).iter.as_mut()?.next() };
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let row = match next {
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Err(e) => return Some(Err(e.into())),
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Ok(None) => return None,
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@ -522,11 +527,13 @@ impl<'a> TxValueIterator<'a> {
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let mut boxed = Box::pin(res);
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trace!("make iterator with sql: {}", sql);
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unsafe {
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let mut stmt = NonNull::from(&boxed.stmt);
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let iter = stmt.as_mut().query(args)?;
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// This unsafe allows us to bypass lifetime checks
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let stmt = unsafe { NonNull::from(&boxed.stmt).as_mut() };
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let iter = stmt.query(args)?;
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let mut_ref: Pin<&mut TxValueIterator<'a>> = Pin::as_mut(&mut boxed);
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let mut_ref = Pin::as_mut(&mut boxed);
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// This unsafe allows us to write in a field of the pinned struct
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unsafe {
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Pin::get_unchecked_mut(mut_ref).iter = Some(iter);
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}
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@ -547,10 +554,9 @@ impl<'a> Iterator for TxValueIteratorPin<'a> {
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type Item = TxOpResult<(Value, Value)>;
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fn next(&mut self) -> Option<Self::Item> {
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let next = unsafe {
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let mut_ref: Pin<&mut TxValueIterator<'a>> = Pin::as_mut(&mut self.0);
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Pin::get_unchecked_mut(mut_ref).iter.as_mut()?.next()
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};
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let mut_ref = Pin::as_mut(&mut self.0);
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// This unsafe allows us to mutably access the iterator field
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let next = unsafe { Pin::get_unchecked_mut(mut_ref).iter.as_mut()?.next() };
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let row = match next {
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Err(e) => return Some(Err(e.into())),
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Ok(None) => return None,
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