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use libc::{c_void, size_t, c_uint};
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use std::{mem, ptr, raw};
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use std::kinds::marker;
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use ffi;
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use database::Database;
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use error::{LmdbResult, lmdb_result, LmdbError};
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use flags::WriteFlags;
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use transaction::Transaction;
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/// An LMDB cursor.
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pub trait Cursor<'txn> {
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/// Returns a raw pointer to the underlying LMDB cursor.
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///
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/// The caller **must** ensure that the pointer is not used after the lifetime of the cursor.
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fn cursor(&self) -> *mut ffi::MDB_cursor;
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}
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/// Cursor extension methods.
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pub trait CursorExt<'txn> : Cursor<'txn> {
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/// Retrieves a key/data pair from the cursor. Depending on the cursor op, the current key is
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/// returned.
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fn get(&self,
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key: Option<&[u8]>,
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data: Option<&[u8]>,
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op: c_uint)
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-> LmdbResult<(Option<&'txn [u8]>, &'txn [u8])> {
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unsafe {
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let mut key_val = slice_to_val(key);
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let mut data_val = slice_to_val(data);
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let key_ptr = key_val.mv_data;
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try!(lmdb_result(ffi::mdb_cursor_get(self.cursor(),
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&mut key_val,
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&mut data_val,
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op)));
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let key_out = if key_ptr != key_val.mv_data { Some(val_to_slice(key_val)) } else { None };
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let data_out = val_to_slice(data_val);
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Ok((key_out, data_out))
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}
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}
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/// Open a new read-only cursor on the given database.
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fn iter(&mut self) -> Items<'txn> {
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Items::new(self)
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}
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}
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impl<'txn, T> CursorExt<'txn> for T where T: Cursor<'txn> {}
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/// A read-only cursor for navigating items within a database.
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pub struct RoCursor<'txn> {
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cursor: *mut ffi::MDB_cursor,
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_no_sync: marker::NoSync,
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|
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_no_send: marker::NoSend,
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_contravariant: marker::ContravariantLifetime<'txn>,
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}
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impl <'txn> Cursor<'txn> for RoCursor<'txn> {
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fn cursor(&self) -> *mut ffi::MDB_cursor {
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|
self.cursor
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}
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}
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#[unsafe_destructor]
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impl <'txn> Drop for RoCursor<'txn> {
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fn drop(&mut self) {
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|
unsafe { ffi::mdb_cursor_close(self.cursor) }
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|
}
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|
}
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impl <'txn> RoCursor<'txn> {
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/// Creates a new read-only cursor in the given database and transaction. Prefer using
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/// `Transaction::open_cursor()`.
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#[doc(hidden)]
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pub fn new(txn: &'txn Transaction, db: Database) -> LmdbResult<RoCursor<'txn>> {
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let mut cursor: *mut ffi::MDB_cursor = ptr::null_mut();
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unsafe { try!(lmdb_result(ffi::mdb_cursor_open(txn.txn(), db.dbi(), &mut cursor))); }
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Ok(RoCursor {
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|
cursor: cursor,
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|
_no_sync: marker::NoSync,
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_no_send: marker::NoSend,
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|
|
_contravariant: marker::ContravariantLifetime::<'txn>,
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})
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|
|
}
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}
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/// A read-only cursor for navigating items within a database.
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|
|
pub struct RwCursor<'txn> {
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|
|
cursor: *mut ffi::MDB_cursor,
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|
|
_no_sync: marker::NoSync,
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|
|
_no_send: marker::NoSend,
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|
|
_contravariant: marker::ContravariantLifetime<'txn>,
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|
|
}
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|
|
impl <'txn> Cursor<'txn> for RwCursor<'txn> {
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|
|
fn cursor(&self) -> *mut ffi::MDB_cursor {
|
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|
|
self.cursor
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|
|
}
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|
|
}
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|
|
#[unsafe_destructor]
|
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|
|
impl <'txn> Drop for RwCursor<'txn> {
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|
|
fn drop(&mut self) {
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|
|
|
unsafe { ffi::mdb_cursor_close(self.cursor) }
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|
|
|
}
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|
|
|
}
|
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|
|
impl <'txn> RwCursor<'txn> {
|
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|
|
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|
|
/// Creates a new read-only cursor in the given database and transaction. Prefer using
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|
|
/// `WriteTransaction::open_write_cursor()`.
|
|
|
|
#[doc(hidden)]
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|
|
pub fn new(txn: &'txn Transaction, db: Database) -> LmdbResult<RwCursor<'txn>> {
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|
|
|
let mut cursor: *mut ffi::MDB_cursor = ptr::null_mut();
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|
|
unsafe { try!(lmdb_result(ffi::mdb_cursor_open(txn.txn(), db.dbi(), &mut cursor))); }
|
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|
|
Ok(RwCursor {
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|
|
|
cursor: cursor,
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|
|
|
_no_sync: marker::NoSync,
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|
|
_no_send: marker::NoSend,
|
|
|
|
_contravariant: marker::ContravariantLifetime::<'txn>,
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|
|
|
})
|
|
|
|
}
|
|
|
|
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|
|
/// Puts a key/data pair into the database. The cursor will be positioned at the new data item,
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|
|
/// or on failure usually near it.
|
|
|
|
pub fn put(&self,
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|
|
|
key: &[u8],
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|
|
|
data: &[u8],
|
|
|
|
flags: WriteFlags)
|
|
|
|
-> LmdbResult<()> {
|
|
|
|
let mut key_val: ffi::MDB_val = ffi::MDB_val { mv_size: key.len() as size_t,
|
|
|
|
mv_data: key.as_ptr() as *mut c_void };
|
|
|
|
let mut data_val: ffi::MDB_val = ffi::MDB_val { mv_size: data.len() as size_t,
|
|
|
|
mv_data: data.as_ptr() as *mut c_void };
|
|
|
|
unsafe {
|
|
|
|
lmdb_result(ffi::mdb_cursor_put(self.cursor(),
|
|
|
|
&mut key_val,
|
|
|
|
&mut data_val,
|
|
|
|
flags.bits()))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Deletes the current key/data pair.
|
|
|
|
///
|
|
|
|
/// ### Flags
|
|
|
|
///
|
|
|
|
/// `NO_DUP_DATA` may be used to delete all data items for the current key, if the database
|
|
|
|
/// was opened with `DUP_SORT`.
|
|
|
|
pub fn del(&self, flags: WriteFlags) -> LmdbResult<()> {
|
|
|
|
unsafe {
|
|
|
|
lmdb_result(ffi::mdb_cursor_del(self.cursor(), flags.bits()))
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
unsafe fn slice_to_val(slice: Option<&[u8]>) -> ffi::MDB_val {
|
|
|
|
match slice {
|
|
|
|
Some(slice) =>
|
|
|
|
ffi::MDB_val { mv_size: slice.len() as size_t,
|
|
|
|
mv_data: slice.as_ptr() as *mut c_void },
|
|
|
|
None =>
|
|
|
|
ffi::MDB_val { mv_size: 0,
|
|
|
|
mv_data: ptr::null_mut() },
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
unsafe fn val_to_slice<'a>(val: ffi::MDB_val) -> &'a [u8] {
|
|
|
|
mem::transmute(raw::Slice {
|
|
|
|
data: val.mv_data as *const u8,
|
|
|
|
len: val.mv_size as uint
|
|
|
|
})
|
|
|
|
}
|
|
|
|
|
|
|
|
pub struct Items<'txn> {
|
|
|
|
cursor: *mut ffi::MDB_cursor,
|
|
|
|
op: c_uint,
|
|
|
|
next_op: c_uint,
|
|
|
|
}
|
|
|
|
|
|
|
|
impl <'txn> Items<'txn> {
|
|
|
|
|
|
|
|
/// Creates a new iterator backed by the given cursor.
|
|
|
|
fn new<'t>(cursor: &Cursor<'t>) -> Items<'t> {
|
|
|
|
Items { cursor: cursor.cursor(), op: ffi::MDB_FIRST, next_op: ffi::MDB_NEXT }
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
impl <'txn> Iterator<(&'txn [u8], &'txn [u8])> for Items<'txn> {
|
|
|
|
|
|
|
|
fn next(&mut self) -> Option<(&'txn [u8], &'txn [u8])> {
|
|
|
|
let mut key = ffi::MDB_val { mv_size: 0, mv_data: ptr::null_mut() };
|
|
|
|
let mut data = ffi::MDB_val { mv_size: 0, mv_data: ptr::null_mut() };
|
|
|
|
|
|
|
|
unsafe {
|
|
|
|
let err_code = ffi::mdb_cursor_get(self.cursor, &mut key, &mut data, self.op);
|
|
|
|
// Set the operation for the next get
|
|
|
|
self.op = self.next_op;
|
|
|
|
if err_code == ffi::MDB_SUCCESS {
|
|
|
|
Some((val_to_slice(key), val_to_slice(data)))
|
|
|
|
} else {
|
|
|
|
// The documentation for mdb_cursor_get specifies that it may fail with MDB_NOTFOUND
|
|
|
|
// and MDB_EINVAL (and we shouldn't be passing in invalid parameters).
|
|
|
|
// TODO: validate that these are the only failures possible.
|
|
|
|
debug_assert!(err_code == ffi::MDB_NOTFOUND,
|
|
|
|
"Unexpected LMDB error {}.", LmdbError::from_err_code(err_code));
|
|
|
|
None
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
mod test {
|
|
|
|
|
|
|
|
use std::{io, ptr};
|
|
|
|
use test::{Bencher, black_box};
|
|
|
|
|
|
|
|
use ffi::*;
|
|
|
|
|
|
|
|
use environment::*;
|
|
|
|
use flags::*;
|
|
|
|
use super::*;
|
|
|
|
use test_utils::*;
|
|
|
|
use transaction::*;
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_iter() {
|
|
|
|
let dir = io::TempDir::new("test").unwrap();
|
|
|
|
let env = Environment::new().open(dir.path(), io::USER_RWX).unwrap();
|
|
|
|
let db = env.open_db(None).unwrap();
|
|
|
|
|
|
|
|
let items = vec!((b"key1", b"val1"),
|
|
|
|
(b"key2", b"val2"),
|
|
|
|
(b"key3", b"val3"));
|
|
|
|
|
|
|
|
{
|
|
|
|
let mut txn = env.begin_write_txn().unwrap();
|
|
|
|
for &(key, data) in items.iter() {
|
|
|
|
txn.put(db, key, data, WriteFlags::empty()).unwrap();
|
|
|
|
}
|
|
|
|
txn.commit().unwrap();
|
|
|
|
}
|
|
|
|
|
|
|
|
let txn = env.begin_read_txn().unwrap();
|
|
|
|
let mut cursor = txn.open_read_cursor(db).unwrap();
|
|
|
|
assert_eq!(items, cursor.iter().collect::<Vec<(&[u8], &[u8])>>());
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_get() {
|
|
|
|
let dir = io::TempDir::new("test").unwrap();
|
|
|
|
let env = Environment::new().open(dir.path(), io::USER_RWX).unwrap();
|
|
|
|
let db = env.open_db(None).unwrap();
|
|
|
|
|
|
|
|
let mut txn = env.begin_write_txn().unwrap();
|
|
|
|
txn.put(db, b"key1", b"val1", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key2", b"val2", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key3", b"val3", WriteFlags::empty()).unwrap();
|
|
|
|
|
|
|
|
let cursor = txn.open_read_cursor(db).unwrap();
|
|
|
|
assert_eq!((Some(b"key1"), b"val1"),
|
|
|
|
cursor.get(None, None, MDB_FIRST).unwrap());
|
|
|
|
assert_eq!((Some(b"key1"), b"val1"),
|
|
|
|
cursor.get(None, None, MDB_GET_CURRENT).unwrap());
|
|
|
|
assert_eq!((Some(b"key2"), b"val2"),
|
|
|
|
cursor.get(None, None, MDB_NEXT).unwrap());
|
|
|
|
assert_eq!((Some(b"key1"), b"val1"),
|
|
|
|
cursor.get(None, None, MDB_PREV).unwrap());
|
|
|
|
assert_eq!((Some(b"key3"), b"val3"),
|
|
|
|
cursor.get(None, None, MDB_LAST).unwrap());
|
|
|
|
assert_eq!((None, b"val2"),
|
|
|
|
cursor.get(Some(b"key2"), None, MDB_SET).unwrap());
|
|
|
|
assert_eq!((Some(b"key3"), b"val3"),
|
|
|
|
cursor.get(Some(b"key3"), None, MDB_SET_KEY).unwrap());
|
|
|
|
assert_eq!((Some(b"key3"), b"val3"),
|
|
|
|
cursor.get(Some(b"key2\0"), None, MDB_SET_RANGE).unwrap());
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_get_dup() {
|
|
|
|
let dir = io::TempDir::new("test").unwrap();
|
|
|
|
let env = Environment::new().open(dir.path(), io::USER_RWX).unwrap();
|
|
|
|
let db = env.create_db(None, DUP_SORT).unwrap();
|
|
|
|
|
|
|
|
let mut txn = env.begin_write_txn().unwrap();
|
|
|
|
txn.put(db, b"key1", b"val1", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key1", b"val2", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key1", b"val3", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key2", b"val1", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key2", b"val2", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key2", b"val3", WriteFlags::empty()).unwrap();
|
|
|
|
|
|
|
|
let cursor = txn.open_read_cursor(db).unwrap();
|
|
|
|
assert_eq!((Some(b"key1"), b"val1"),
|
|
|
|
cursor.get(None, None, MDB_FIRST).unwrap());
|
|
|
|
assert_eq!((None, b"val1"),
|
|
|
|
cursor.get(None, None, MDB_FIRST_DUP).unwrap());
|
|
|
|
assert_eq!((Some(b"key1"), b"val1"),
|
|
|
|
cursor.get(None, None, MDB_GET_CURRENT).unwrap());
|
|
|
|
assert_eq!((Some(b"key2"), b"val1"),
|
|
|
|
cursor.get(None, None, MDB_NEXT_NODUP).unwrap());
|
|
|
|
assert_eq!((Some(b"key2"), b"val2"),
|
|
|
|
cursor.get(None, None, MDB_NEXT_DUP).unwrap());
|
|
|
|
assert_eq!((Some(b"key2"), b"val3"),
|
|
|
|
cursor.get(None, None, MDB_NEXT_DUP).unwrap());
|
|
|
|
assert!(cursor.get(None, None, MDB_NEXT_DUP).is_err());
|
|
|
|
assert_eq!((Some(b"key2"), b"val2"),
|
|
|
|
cursor.get(None, None, MDB_PREV_DUP).unwrap());
|
|
|
|
assert_eq!((None, b"val3"),
|
|
|
|
cursor.get(None, None, MDB_LAST_DUP).unwrap());
|
|
|
|
assert_eq!((Some(b"key1"), b"val3"),
|
|
|
|
cursor.get(None, None, MDB_PREV_NODUP).unwrap());
|
|
|
|
assert_eq!((None, b"val1"),
|
|
|
|
cursor.get(Some(b"key1"), None, MDB_SET).unwrap());
|
|
|
|
assert_eq!((Some(b"key2"), b"val1"),
|
|
|
|
cursor.get(Some(b"key2"), None, MDB_SET_KEY).unwrap());
|
|
|
|
assert_eq!((Some(b"key2"), b"val1"),
|
|
|
|
cursor.get(Some(b"key1\0"), None, MDB_SET_RANGE).unwrap());
|
|
|
|
assert_eq!((None, b"val3"),
|
|
|
|
cursor.get(Some(b"key1"), Some(b"val3"), MDB_GET_BOTH).unwrap());
|
|
|
|
assert_eq!((None, b"val1"),
|
|
|
|
cursor.get(Some(b"key2"), Some(b"val"), MDB_GET_BOTH_RANGE).unwrap());
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_get_dupfixed() {
|
|
|
|
let dir = io::TempDir::new("test").unwrap();
|
|
|
|
let env = Environment::new().open(dir.path(), io::USER_RWX).unwrap();
|
|
|
|
let db = env.create_db(None, DUP_SORT | DUP_FIXED).unwrap();
|
|
|
|
|
|
|
|
let mut txn = env.begin_write_txn().unwrap();
|
|
|
|
txn.put(db, b"key1", b"val1", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key1", b"val2", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key1", b"val3", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key2", b"val4", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key2", b"val5", WriteFlags::empty()).unwrap();
|
|
|
|
txn.put(db, b"key2", b"val6", WriteFlags::empty()).unwrap();
|
|
|
|
|
|
|
|
let cursor = txn.open_read_cursor(db).unwrap();
|
|
|
|
assert_eq!((Some(b"key1"), b"val1"),
|
|
|
|
cursor.get(None, None, MDB_FIRST).unwrap());
|
|
|
|
assert_eq!((None, b"val1val2val3"),
|
|
|
|
cursor.get(None, None, MDB_GET_MULTIPLE).unwrap());
|
|
|
|
assert!(cursor.get(None, None, MDB_NEXT_MULTIPLE).is_err());
|
|
|
|
}
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
fn test_put_del() {
|
|
|
|
let dir = io::TempDir::new("test").unwrap();
|
|
|
|
let env = Environment::new().open(dir.path(), io::USER_RWX).unwrap();
|
|
|
|
let db = env.open_db(None).unwrap();
|
|
|
|
|
|
|
|
let mut txn = env.begin_write_txn().unwrap();
|
|
|
|
let cursor = txn.open_write_cursor(db).unwrap();
|
|
|
|
|
|
|
|
cursor.put(b"key1", b"val1", WriteFlags::empty()).unwrap();
|
|
|
|
cursor.put(b"key2", b"val2", WriteFlags::empty()).unwrap();
|
|
|
|
cursor.put(b"key3", b"val3", WriteFlags::empty()).unwrap();
|
|
|
|
|
|
|
|
assert_eq!((Some(b"key3"), b"val3"),
|
|
|
|
cursor.get(None, None, MDB_GET_CURRENT).unwrap());
|
|
|
|
|
|
|
|
cursor.del(WriteFlags::empty()).unwrap();
|
|
|
|
assert_eq!((Some(b"key2"), b"val2"),
|
|
|
|
cursor.get(None, None, MDB_LAST).unwrap());
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Benchmark of iterator sequential read performance.
|
|
|
|
#[bench]
|
|
|
|
fn bench_get_seq_iter(b: &mut Bencher) {
|
|
|
|
let n = 100;
|
|
|
|
let (_dir, env) = setup_bench_db(n);
|
|
|
|
let db = env.open_db(None).unwrap();
|
|
|
|
let txn = env.begin_read_txn().unwrap();
|
|
|
|
|
|
|
|
b.iter(|| {
|
|
|
|
let mut cursor = txn.open_read_cursor(db).unwrap();
|
|
|
|
let mut i = 0;
|
|
|
|
let mut count = 0u32;
|
|
|
|
|
|
|
|
for (key, data) in cursor.iter() {
|
|
|
|
i = i + key.len() + data.len();
|
|
|
|
count = count + 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
black_box(i);
|
|
|
|
assert_eq!(count, n);
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Benchmark of cursor sequential read performance.
|
|
|
|
#[bench]
|
|
|
|
fn bench_get_seq_cursor(b: &mut Bencher) {
|
|
|
|
let n = 100;
|
|
|
|
let (_dir, env) = setup_bench_db(n);
|
|
|
|
let db = env.open_db(None).unwrap();
|
|
|
|
let txn = env.begin_read_txn().unwrap();
|
|
|
|
|
|
|
|
b.iter(|| {
|
|
|
|
let cursor = txn.open_read_cursor(db).unwrap();
|
|
|
|
let mut i = 0;
|
|
|
|
let mut count = 0u32;
|
|
|
|
|
|
|
|
while let Ok((key_opt, val)) = cursor.get(None, None, MDB_NEXT) {
|
|
|
|
i += key_opt.map(|key| key.len()).unwrap_or(0) + val.len();
|
|
|
|
count += 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
black_box(i);
|
|
|
|
assert_eq!(count, n);
|
|
|
|
});
|
|
|
|
}
|
|
|
|
|
|
|
|
/// Benchmark of raw LMDB sequential read performance (control).
|
|
|
|
#[bench]
|
|
|
|
fn bench_get_seq_raw(b: &mut Bencher) {
|
|
|
|
let n = 100;
|
|
|
|
let (_dir, env) = setup_bench_db(n);
|
|
|
|
let db = env.open_db(None).unwrap();
|
|
|
|
|
|
|
|
let dbi: MDB_dbi = db.dbi();
|
|
|
|
let _txn = env.begin_read_txn().unwrap();
|
|
|
|
let txn = _txn.txn();
|
|
|
|
|
|
|
|
let mut key = MDB_val { mv_size: 0, mv_data: ptr::null_mut() };
|
|
|
|
let mut data = MDB_val { mv_size: 0, mv_data: ptr::null_mut() };
|
|
|
|
let mut cursor: *mut MDB_cursor = ptr::null_mut();
|
|
|
|
|
|
|
|
b.iter(|| unsafe {
|
|
|
|
mdb_cursor_open(txn, dbi, &mut cursor);
|
|
|
|
let mut i = 0;
|
|
|
|
let mut count = 0u32;
|
|
|
|
|
|
|
|
while mdb_cursor_get(cursor, &mut key, &mut data, MDB_NEXT) == 0 {
|
|
|
|
i += key.mv_size + data.mv_size;
|
|
|
|
count += 1;
|
|
|
|
};
|
|
|
|
|
|
|
|
black_box(i);
|
|
|
|
assert_eq!(count, n);
|
|
|
|
mdb_cursor_close(cursor);
|
|
|
|
});
|
|
|
|
}
|
|
|
|
}
|