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/*
This file is part of jellything (https://codeberg.org/metamuffin/jellything)
which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
Copyright (C) 2023 metamuffin <metamuffin.org>
*/
use crate::{Action, MigrateMode};
use anyhow::{bail, Context};
use indicatif::ProgressIterator;
use jellybase::database::{typed_sled::Tree, Database};
use log::{info, warn};
use serde::Serialize;
use std::{
fs::File,
io::{BufRead, BufReader, BufWriter, Write},
path::Path,
};
pub(crate) fn migrate(action: Action) -> anyhow::Result<()> {
match action {
Action::Migrate {
mode,
save_location,
database,
} => {
std::fs::create_dir_all(&save_location)?;
let db = Database::open(&database)?;
info!("processing 'user'");
process_tree(mode, &save_location.join("user"), &db.user)?;
info!("processing 'user_node'");
process_tree(mode, &save_location.join("user_node"), &db.user_node)?;
info!("processing 'invite'");
process_tree(mode, &save_location.join("invite"), &db.invite)?;
info!("processing 'node'");
process_tree(mode, &save_location.join("node"), &db.node)?;
info!("done");
Ok(())
}
_ => unreachable!(),
}
}
fn process_tree<
K: Serialize + for<'de> serde::Deserialize<'de>,
V: Serialize + for<'de> serde::Deserialize<'de>,
>(
mode: MigrateMode,
path: &Path,
tree: &Tree<K, V>,
) -> anyhow::Result<()> {
match mode {
MigrateMode::Export => export_tree(path, tree),
MigrateMode::Import => import_tree(path, tree),
}
}
fn export_tree<
K: Serialize + for<'de> serde::Deserialize<'de>,
V: Serialize + for<'de> serde::Deserialize<'de>,
>(
path: &Path,
tree: &Tree<K, V>,
) -> anyhow::Result<()> {
let mut o = BufWriter::new(File::create(path)?);
let len = tree.len();
for r in tree.iter().progress_count(len.try_into().unwrap()) {
let (k, v) = r?;
serde_json::to_writer(&mut o, &(k, v))?;
writeln!(&mut o)?;
}
Ok(())
}
fn import_tree<
K: Serialize + for<'de> serde::Deserialize<'de>,
V: Serialize + for<'de> serde::Deserialize<'de>,
>(
path: &Path,
tree: &Tree<K, V>,
) -> anyhow::Result<()> {
if !tree.is_empty() {
bail!("tree not empty, `rm -rf` your db please :)")
}
let Ok(i) = File::open(path) else {
warn!("{path:?} does not exist; the import of that tree will be skipped.");
return Ok(());
};
let i = BufReader::new(i);
for l in i.lines() {
let l = l?;
let (k, v) = serde_json::from_str::<(K, V)>(&l).context("reading db dump item")?;
tree.insert(&k, &v)?;
}
Ok(())
}
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