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use crate::{
backend::{
LmdbEnvironment,
SafeModeEnvironment,
},
error::MigrateError,
Rkv,
StoreOptions,
};
pub use crate::backend::{
LmdbArchMigrateError,
LmdbArchMigrateResult,
LmdbArchMigrator,
};
macro_rules! fn_migrator {
($name:tt, $src_env:ty, $dst_env:ty) => {
pub fn $name<S, D>(src_env: S, dst_env: D) -> Result<(), MigrateError>
where
S: std::ops::Deref<Target = Rkv<$src_env>>,
D: std::ops::Deref<Target = Rkv<$dst_env>>,
{
let src_dbs = src_env.get_dbs().unwrap();
if src_dbs.is_empty() {
return Err(MigrateError::SourceEmpty);
}
let dst_dbs = dst_env.get_dbs().unwrap();
if !dst_dbs.is_empty() {
return Err(MigrateError::DestinationNotEmpty);
}
for name in src_dbs {
let src_store = src_env.open_single(name.as_deref(), StoreOptions::default())?;
let dst_store = dst_env.open_single(name.as_deref(), StoreOptions::create())?;
let reader = src_env.read()?;
let mut writer = dst_env.write()?;
let mut iter = src_store.iter_start(&reader)?;
while let Some(Ok((key, value))) = iter.next() {
dst_store.put(&mut writer, key, &value).expect("wrote");
}
writer.commit()?;
}
Ok(())
}
};
($migrate:tt, $name:tt, $builder:tt, $src_env:ty, $dst_env:ty) => {
pub fn $name<F, D>(path: &std::path::Path, build: F, dst_env: D) -> Result<(), MigrateError>
where
F: FnOnce(crate::backend::$builder) -> crate::backend::$builder,
D: std::ops::Deref<Target = Rkv<$dst_env>>,
{
use crate::backend::*;
let mut manager = crate::Manager::<$src_env>::singleton().write()?;
let mut builder = Rkv::<$src_env>::environment_builder::<$builder>();
builder.set_max_dbs(crate::env::DEFAULT_MAX_DBS);
builder = build(builder);
let src_env = manager.get_or_create_from_builder(path, builder, Rkv::from_builder::<$builder>)?;
match Migrator::$migrate(src_env.read()?, dst_env) {
Err(crate::MigrateError::SourceEmpty) => return Ok(()),
result => result,
}?;
drop(src_env);
manager.try_close_and_delete(path)?;
Ok(())
}
};
}
macro_rules! fns_migrator {
($src:tt, $dst:tt) => {
paste::item! {
fns_migrator!([<migrate_ $src _to_ $dst>], $src, $dst);
fns_migrator!([<migrate_ $dst _to_ $src>], $dst, $src);
}
};
($name:tt, $src:tt, $dst:tt) => {
paste::item! {
fn_migrator!($name, [<$src:camel Environment>], [<$dst:camel Environment>]);
fn_migrator!($name, [<auto_ $name>], [<$src:camel>], [<$src:camel Environment>], [<$dst:camel Environment>]);
}
};
}
pub struct Migrator;
impl Migrator {
fns_migrator!(lmdb, safe_mode);
}