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use std::fs;
use std::collections::HashMap;
use std::path::{PathBuf, Path};
use std::sync::{Arc,RwLock};
use chrono::{DateTime, Utc};
use futures::{FutureExt, TryStreamExt};
use uuid::Uuid;
use fs2::FileExt;
use tokio::runtime;
use tokio_stream::wrappers::ReadDirStream;
use futures::stream::StreamExt;
#[derive(Hash, PartialEq, Eq, Clone)]
struct PageUuid(Uuid);
#[derive(Hash, PartialEq, Eq, Clone)]
struct NamespaceUuid(Uuid);
#[derive(Hash, PartialEq, Eq, Clone)]
struct MediaUuid(Uuid);
struct ContentSnapshot {
pages: HashMap<PageUuid, Page>,
namespaces: HashMap<NamespaceUuid, Namespace>,
media: HashMap<MediaUuid, Media>,
namespace_path: HashMap<String, NamespaceUuid>,
page_path: HashMap<String, PageUuid>,
media_path: HashMap<String, MediaUuid>,
render_cache: HashMap<PageUuid, String>,
}
struct Page {
uuid: PageUuid,
title: String,
namespace: NamespaceUuid,
slug: String,
current_version: DateTime<Utc>,
prev_version: DateTime<Utc>,
}
struct Namespace {
uuid: NamespaceUuid,
path: String,
pages: Vec<PageUuid>,
}
struct Media {
uuid: MediaUuid,
filename: String,
mime_type: String,
uploaded_by: Uuid,
uploaded_on: Uuid,
used_on: Vec<PageUuid>,
}
struct ContentController {
snapshot: RwLock<Box<Arc<ContentSnapshot>>>,
lock: fs::File,
}
impl ContentController {
pub fn init(data_dir: PathBuf) -> Result<Self, String> {
let lock_path = Path::join(&data_dir, ".lock");
let lockfile = fs::OpenOptions::new()
.read(true).write(true).create(true)
.open(&lock_path)
.map_err(|_| "Could not open data directory".to_string())?;
lockfile.try_lock_exclusive()
.map_err(|_| "Could not lock data directory".to_string())?;
let runtime = runtime::Builder::new_multi_thread()
.build()
.map_err(|_| "Could not start async runtime".to_string())?;
// Read the things
let snapshot = runtime.block_on(Self::read_data(&data_dir))?;
Ok(Self {
lock: lockfile,
snapshot: RwLock::new(Box::new(Arc::new(snapshot))),
})
}
async fn read_data(data_dir: &PathBuf) -> Result<ContentSnapshot, String> {
use tokio::fs;
let page_slugs = Arc::new(tokio::sync::Mutex::new(HashMap::<PageUuid, String>::new()));
let namespace_names_dir = Path::join(&data_dir, "namespaces/names");
let namespace_ids_dir = Path::join(&data_dir, "namespaces/id");
let namespace_future = fs::read_dir(&namespace_names_dir).await
.map_err(|_| "Could not open namespace directory".to_string())
.map(|dir_entries| { ReadDirStream::new(dir_entries) })?
.filter_map(async |dir_entry| -> Option<Namespace> {
let link_path = dir_entry.as_ref().ok()?.path();
let target_path = dir_entry.as_ref().ok()?
.metadata().await.ok()?
.is_symlink()
.then_some(
fs::read_link(link_path).await.ok()
)??;
let last_segment = target_path.file_name()?;
target_path.parent()?
.eq(&namespace_ids_dir).then_some(())?;
let namespace_name = dir_entry.as_ref().ok()?.file_name().to_str()?.to_string();
let namespace_uuid = NamespaceUuid(Uuid::try_parse(last_segment.to_str()?).ok()?);
let namespace_pages = fs::read_dir(Path::join(&namespace_ids_dir, last_segment).join("pages")).await.ok()?;
let namespace_page_uuids = ReadDirStream::new(namespace_pages)
.filter_map(async |dir_entry| -> Option<PageUuid> {
let page_path = dir_entry.as_ref().ok()?.path();
let page_uuid = dir_entry.as_ref().ok()?
.metadata().await.ok()?
.is_symlink()
.then_some(
fs::read_link(&page_path).await.ok()
)??;
let page_uuid = PageUuid(Uuid::try_parse(&page_uuid.to_str()?).ok()?);
let page_slug = page_path.file_name()?.to_str()?.to_string();
page_slugs.lock().await.insert(page_uuid.clone(), page_slug);
Some(page_uuid)
}).collect::<Vec<PageUuid>>().await;
Some(Namespace {
uuid: namespace_uuid,
path: namespace_name,
pages: namespace_page_uuids,
})
}).collect::<Vec<Namespace>>().await;
let pages_dir = Path::join(&data_dir, "pages/id");
let page_future = fs::read_dir(&pages_dir).await
.map_err(|_| "Could not open pages data directory".to_string())
.map(|dir_entries| { ReadDirStream::new(dir_entries) })?
.filter_map(async |dir_entry| -> Option<Page> {
});
return Err("Unimplemented".to_string());
}
}
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