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use crate::{ffi, ffi_util::to_cpath, Error, Options};
use libc::{self, c_char, size_t};
use std::{ffi::CString, marker::PhantomData, path::Path};
pub struct SstFileWriter<'a> {
pub(crate) inner: *mut ffi::rocksdb_sstfilewriter_t,
phantom: PhantomData<&'a Options>,
}
unsafe impl<'a> Send for SstFileWriter<'a> {}
unsafe impl<'a> Sync for SstFileWriter<'a> {}
struct EnvOptions {
inner: *mut ffi::rocksdb_envoptions_t,
}
impl Drop for EnvOptions {
fn drop(&mut self) {
unsafe {
ffi::rocksdb_envoptions_destroy(self.inner);
}
}
}
impl Default for EnvOptions {
fn default() -> EnvOptions {
let opts = unsafe { ffi::rocksdb_envoptions_create() };
EnvOptions { inner: opts }
}
}
impl<'a> SstFileWriter<'a> {
pub fn create(opts: &'a Options) -> SstFileWriter {
let env_options = EnvOptions::default();
let writer = SstFileWriter::create_raw(opts, &env_options);
SstFileWriter {
inner: writer,
phantom: PhantomData,
}
}
fn create_raw(opts: &Options, env_opts: &EnvOptions) -> *mut ffi::rocksdb_sstfilewriter_t {
unsafe { ffi::rocksdb_sstfilewriter_create(env_opts.inner, opts.inner) }
}
pub fn open<P: AsRef<Path>>(&'a self, path: P) -> Result<(), Error> {
let cpath = to_cpath(&path)?;
self.open_raw(&cpath)
}
fn open_raw(&'a self, cpath: &CString) -> Result<(), Error> {
unsafe {
ffi_try!(ffi::rocksdb_sstfilewriter_open(
self.inner,
cpath.as_ptr() as *const _
));
Ok(())
}
}
pub fn finish(&mut self) -> Result<(), Error> {
unsafe {
ffi_try!(ffi::rocksdb_sstfilewriter_finish(self.inner,));
Ok(())
}
}
pub fn file_size(&self) -> u64 {
let mut file_size: u64 = 0;
unsafe { ffi::rocksdb_sstfilewriter_file_size(self.inner, &mut file_size) };
file_size
}
pub fn put<K, V>(&mut self, key: K, value: V) -> Result<(), Error>
where
K: AsRef<[u8]>,
V: AsRef<[u8]>,
{
let key = key.as_ref();
let value = value.as_ref();
unsafe {
ffi_try!(ffi::rocksdb_sstfilewriter_put(
self.inner,
key.as_ptr() as *const c_char,
key.len() as size_t,
value.as_ptr() as *const c_char,
value.len() as size_t,
));
Ok(())
}
}
pub fn merge<K, V>(&mut self, key: K, value: V) -> Result<(), Error>
where
K: AsRef<[u8]>,
V: AsRef<[u8]>,
{
let key = key.as_ref();
let value = value.as_ref();
unsafe {
ffi_try!(ffi::rocksdb_sstfilewriter_merge(
self.inner,
key.as_ptr() as *const c_char,
key.len() as size_t,
value.as_ptr() as *const c_char,
value.len() as size_t,
));
Ok(())
}
}
pub fn delete<K: AsRef<[u8]>>(&mut self, key: K) -> Result<(), Error> {
let key = key.as_ref();
unsafe {
ffi_try!(ffi::rocksdb_sstfilewriter_delete(
self.inner,
key.as_ptr() as *const c_char,
key.len() as size_t,
));
Ok(())
}
}
}
impl<'a> Drop for SstFileWriter<'a> {
fn drop(&mut self) {
unsafe {
ffi::rocksdb_sstfilewriter_destroy(self.inner);
}
}
}