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Add migrate_kv_store_data util method

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.. allowing to migrate data from one store to another.
This commit is contained in:
Elias Rohrer 2024-12-12 13:51:50 +01:00
parent 96f7bfda8c
commit 4c1f6bdf34
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1 changed files with 21 additions and 0 deletions
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21
lightning/src/util/persist.rs
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@ -176,6 +176,27 @@ pub trait MigratableKVStore: KVStore {
fn list_all_keys(&self) -> Result<Vec<(String, String, String)>, io::Error>;
}
/// Migrates all data from one store to another.
///
/// This operation assumes that `target_store` is empty, i.e., any data present under copied keys
/// might get overriden. User must ensure `source_store` is not modified during operation,
/// otherwise no consistency guarantees can be given.
///
/// Will abort and return an error if any IO operation fails. Note that in this case the
/// `target_store` might get left in an intermediate state.
pub fn migrate_kv_store_data<S: MigratableKVStore, T: MigratableKVStore>(
source_store: &mut S, target_store: &mut T,
) -> Result<(), io::Error> {
let keys_to_migrate = source_store.list_all_keys()?;
for (primary_namespace, secondary_namespace, key) in &keys_to_migrate {
let data = source_store.read(primary_namespace, secondary_namespace, key)?;
target_store.write(primary_namespace, secondary_namespace, key, &data)?;
}
Ok(())
}
/// Trait that handles persisting a [`ChannelManager`], [`NetworkGraph`], and [`WriteableScore`] to disk.
///
/// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager