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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::{database::Database, federation::Federation, CONF};
use anyhow::{anyhow, bail, Context, Ok};
use async_recursion::async_recursion;
use futures::{stream::FuturesUnordered, StreamExt};
use jellybase::cache_file;
use jellyclient::Session;
use jellycommon::{AssetLocation, MediaSource, Node, NodePrivate, RemoteImportOptions};
use log::{debug, error, info};
use std::{ffi::OsStr, fs::File, os::unix::prelude::OsStrExt, path::PathBuf, sync::LazyLock};
use tokio::sync::Semaphore;
static IMPORT_SEM: LazyLock<Semaphore> = LazyLock::new(|| Semaphore::new(1));
pub async fn import(db: &Database, fed: &Federation) -> anyhow::Result<()> {
info!("clearing node tree");
let permit = IMPORT_SEM.try_acquire()?;
db.node.clear()?;
info!("importing...");
let (_, errs) = import_path(CONF.library_path.clone(), db, fed, None)
.await
.context("indexing")?;
info!("import completed");
drop(permit);
if errs == 0 {
Ok(())
} else {
Err(anyhow!(
"partial import, {errs} errors occured; see server log"
))
}
}
#[async_recursion]
pub async fn import_path(
path: PathBuf,
db: &Database,
fed: &Federation,
parent: Option<String>,
) -> anyhow::Result<(Vec<String>, usize)> {
if path.is_dir() {
let mpath = path.join("directory.json");
let children_paths = path.read_dir()?.map(Result::unwrap).filter_map(|e| {
if e.path().extension() == Some(&OsStr::from_bytes(b"jelly"))
|| e.metadata().unwrap().is_dir()
{
Some(e.path())
} else {
None
}
});
let identifier = if mpath.exists() {
path.file_name().unwrap().to_str().unwrap().to_string()
} else {
parent
.clone()
.ok_or(anyhow!("non-root node requires parent"))?
};
let mut all: FuturesUnordered<_> = children_paths
.into_iter()
.map(|p| import_path(p, db, fed, Some(identifier.clone())))
.collect();
let mut children_ids = Vec::new();
let mut errs = 0;
while let Some(k) = all.next().await {
match k {
core::result::Result::Ok((els, errs2)) => {
errs += errs2;
children_ids.extend(els)
}
Err(e) => {
errs += 1;
error!("import failed: {e:?}")
}
}
}
if mpath.exists() {
let mut data: Node =
serde_json::from_reader(File::open(mpath).context("metadata missing")?)?;
data.public.children = children_ids;
data.public.parent = parent;
info!("adding {identifier}");
db.node.insert(&identifier, &data)?;
Ok((vec![identifier], errs))
} else {
Ok((children_ids, errs))
}
} else if path.is_file() {
info!("loading {path:?}");
let datafile = File::open(path.clone()).context("cant load metadata")?;
let mut data: Node = serde_json::from_reader(datafile).context("invalid metadata")?;
let identifier = data.private.id.clone().unwrap_or_else(|| {
path.file_name()
.unwrap()
.to_str()
.unwrap()
.strip_suffix(".jelly")
.unwrap()
.to_string()
});
if let Some(io) = data.private.import.take() {
let session = fed
.get_session(&io.host)
.await
.context("creating session")?;
import_remote(io, db, &session, &identifier, parent)
.await
.context("federated import")?;
} else {
debug!("adding {identifier}");
data.public.parent = parent;
db.node.insert(&identifier, &data)?;
}
Ok((vec![identifier], 0))
} else {
bail!("did somebody really put a fifo or socket in the library?!")
}
}
#[async_recursion]
async fn import_remote(
opts: RemoteImportOptions,
db: &Database,
session: &Session,
identifier: &String,
parent: Option<String>,
) -> anyhow::Result<()> {
info!("loading federated node {identifier:?}");
let node = session
.node(&opts.id)
.await
.context("fetching remote node")?;
let poster = cache_federation_asset(session, &opts.id, "poster").await?;
let backdrop = cache_federation_asset(session, &opts.id, "backdrop").await?;
let mut node = Node {
public: node,
private: NodePrivate {
backdrop: Some(AssetLocation::Cache(backdrop)),
poster: Some(AssetLocation::Cache(poster)),
import: None,
id: None,
source: Some(MediaSource::Remote {
host: opts.host.clone(),
remote_id: opts.id.clone(),
}),
},
};
for c in &mut node.public.children {
let prefixed = format!("{}{c}", opts.prefix.clone().unwrap_or(String::new()));
import_remote(
RemoteImportOptions {
id: c.to_owned(),
..opts.clone()
},
db,
session,
&prefixed,
Some(opts.id.clone()),
)
.await?;
*c = prefixed;
}
node.public.parent = parent;
node.public.federated = Some(opts.host.clone());
debug!("adding {identifier}");
db.node.insert(identifier, &node)?;
Ok(())
}
async fn cache_federation_asset(
session: &Session,
identifier: &String,
role: &str,
) -> anyhow::Result<PathBuf> {
let poster = cache_file(&["federation-asset", role, identifier]);
if !poster.exists() {
session
.node_asset(&identifier, role, File::create(&poster)?)
.await?;
}
Ok(poster)
}
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