Merge remote-tracking branch 'torrential/main' into develop

2026-03-30 19:24:10 +11:00
parent f1a8badce2 ff17d4256a
commit 1e7019606b
29 changed files with 5075 additions and 0 deletions
@@ -0,0 +1,3 @@
 /target
 /src/proto/*
 !/src/proto/.gitkeep
@@ -0,0 +1,69 @@
 [package]
 name = "torrential"
 version = "0.1.0"
 edition = "2024"
 [lib]
 name = "torrential"
 path = "src/lib.rs"
 [[bin]]
 name = "torrential"
 path = "src/main.rs"
 [dependencies]
 axum = { version = "0.8.7", features = ["macros"] }
 log = "0.4.28"
 reqwest = { version = "0.12.24", default-features = false, features = [
    "json",
    "rustls-tls",
 ] }
 serde = { version = "1.0.228", features = ["derive"] }
 simple_logger = { version = "5.1.0", default-features = false, features = [
    "colors",
 ] }
 tokio = { version = "*", features = ["rt-multi-thread", "sync"] }
 droplet-rs = { version = "0.16.2", git = "https://github.com/Drop-OSS/droplet-rs.git" }
 dashmap = "6.1.0"
 anyhow = "1.0.100"
 serde_json = "1.0.145"
 url = { version = "2.5.7", default-features = false }
 tokio-util = { version = "0.7.17", features = ["io"] }
 async-trait = "0.1.89"
 futures-util = "0.3.31"
 ctr = "0.9.2"
 aes = "0.8.4"
 bytes = "*"
 file_open_limit = "0.0.5"
 pin-project-lite = "0.2.16"
 protobuf = "3.7.2"
 waitmap = "1.1.0"
 uuid = { version = "1.20.0", features = ["v4"] }
 num_cpus = "1.17.0"
 [lints.clippy]
 pedantic = { level = "warn", priority = -1 }
 almost_swapped = "deny"
 unwrap_used = "warn"
 expect_used = "warn"
 dbg_macro = "deny"
 needless_match = "deny"
 cast_possible_truncation = "warn"
 cast_possible_wrap = "warn"
 single_match_else = "warn"
 inconsistent_digit_grouping = "warn"
 [[bench]]
 name = "torrential"
 harness = false
 [dev-dependencies]
 criterion = { version = "0.8.0", features = ["async", "async_tokio"] }
 rand = "0.9.2"
 tempfile = "3.23.0"
 [build-dependencies]
 protobuf-codegen = "3.7.2"
 protoc-bin-vendored = "3.2.0"
@@ -0,0 +1,660 @@
 # GNU AFFERO GENERAL PUBLIC LICENSE
 Version 3, 19 November 2007
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 ### 17. Interpretation of Sections 15 and 16.
 If the disclaimer of warranty and limitation of liability provided
 above cannot be given local legal effect according to their terms,
 reviewing courts shall apply local law that most closely approximates
 an absolute waiver of all civil liability in connection with the
 Program, unless a warranty or assumption of liability accompanies a
 copy of the Program in return for a fee.
 END OF TERMS AND CONDITIONS
 ## How to Apply These Terms to Your New Programs
 If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these
 terms.
 To do so, attach the following notices to the program. It is safest to
 attach them to the start of each source file to most effectively state
 the exclusion of warranty; and each file should have at least the
 "copyright" line and a pointer to where the full notice is found.
        <one line to give the program's name and a brief idea of what it does.>
        Copyright (C) <year>  <name of author>
        This program is free software: you can redistribute it and/or modify
        it under the terms of the GNU Affero General Public License as
        published by the Free Software Foundation, either version 3 of the
        License, or (at your option) any later version.
        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU Affero General Public License for more details.
        You should have received a copy of the GNU Affero General Public License
        along with this program.  If not, see <https://www.gnu.org/licenses/>.
 Also add information on how to contact you by electronic and paper
 mail.
 If your software can interact with users remotely through a computer
 network, you should also make sure that it provides a way for users to
 get its source. For example, if your program is a web application, its
 interface could display a "Source" link that leads users to an archive
 of the code. There are many ways you could offer source, and different
 solutions will be better for different programs; see section 13 for
 the specific requirements.
 You should also get your employer (if you work as a programmer) or
 school, if any, to sign a "copyright disclaimer" for the program, if
 necessary. For more information on this, and how to apply and follow
 the GNU AGPL, see <https://www.gnu.org/licenses/>.
@@ -0,0 +1,4 @@
 # torrential
 A Rust webserver designed to hook into the Drop server and serve the content files, but at a lightning fast speed. Designed to be built into the Drop Docker container, and proxied automatically via NGINX at `/api/v1/depot`. 
@@ -0,0 +1,46 @@
 use std::{
    cmp,
    fs::File,
    io::{BufWriter, Write},
 };
 use criterion::{Criterion, criterion_group, criterion_main};
 use rand::{Rng, rng};
 use tempfile::tempfile;
 use tokio::runtime::Runtime;
 async fn torrential() {}
 fn generate_file() -> File {
    let total_bytes = 312 * 1024 * 1024;
    let tempfile = tempfile().unwrap();
    let mut writer = BufWriter::new(tempfile);
    let mut rng = rng();
    let mut buffer = [0; 1024];
    let mut remaining_size = total_bytes;
    while remaining_size > 0 {
        let to_write = cmp::min(remaining_size, buffer.len());
        let buffer = &mut buffer[..to_write];
        rng.fill(buffer);
        writer.write(buffer).unwrap();
        remaining_size -= to_write;
    }
    writer.into_inner().unwrap()
 }
 // The benchmark function setup
 fn benchmark(c: &mut Criterion) {
    let rt = Runtime::new().unwrap();
    let file = generate_file();
    c.bench_function("torrential download", |b| {
        b.to_async(&rt).iter(|| torrential())
    });
 }
 // Grouping your benchmarks
 criterion_group!(benches, benchmark);
 criterion_main!(benches);
@@ -0,0 +1,25 @@
 use std::fs::{self, read_dir};
 use protobuf_codegen::Codegen;
 const OUT_DIR: &str = "./src/proto/";
 fn main() {
    let files = read_dir("./proto").unwrap();
    let files = files.map(|v| format!("proto/{}", v.unwrap().file_name().into_string().unwrap()));
    read_dir(OUT_DIR).unwrap().for_each(|v| {
        if let Ok(entry) = v
            && entry.file_name().to_str().unwrap().ends_with(".rs") {
                fs::remove_file(entry.path()).unwrap();
            }
    });
    Codegen::new()
        .protoc_path(&protoc_bin_vendored::protoc_bin_path().unwrap())
        .inputs(files)
        .include("proto")
        .out_dir(OUT_DIR)
        .run()
        .unwrap();
 }
@@ -0,0 +1,8 @@
 # Protocol
 `torrential` implements the Depot API as defined by https://developer.droposs.org/web/depot, and it prefixed with `/api/v1/depot` for NGINX proxying.
 It also has the following endpoints, only accessible by the Drop server for security reasons:
 - `/key` for sharing the authentication key from the Drop server to torrential
 - `/invalidate` for pre-emptivel clearing the download context cache. Contexts are automatically cleared regardless, so this endpoint failing is not a hard error on the Drop side
 - `/healthcheck`. Does healthcheck.
@@ -0,0 +1,6 @@
 # Structure
 Torrential is a typical Rust project. Source files are in `src/`. 
 `handlers.rs` contains most non-download endpoint handlers. `serve.rs` contains the download endpoint handler.
 `remote.rs` handles communciating with the Drop server. 
@@ -0,0 +1,45 @@
 syntax = "proto3";
 enum TorrentialBoundType {
  ERROR = 0;
  SERVER_GAMES_RESPONSE = 1;
  VERSION_RESPONSE = 2;
  GENERATE_MANIFEST = 3;
  GENERATE_ROOT_CA = 4;
  GENERATE_CLIENT_CERT = 5;
  HAS_BACKEND_QUERY = 6;
  LIST_FILES_QUERY = 7;
  PEEK_FILE_QUERY = 8;
 }
 message TorrentialBound {
  string message_id = 1;
  TorrentialBoundType type = 2;
  bytes data = 3;
 }
 enum DropBoundType {
  SERVER_GAMES_QUERY = 0;
  VERSION_QUERY = 1;
  RPC_ERROR = 2;
  MANIFEST_PROGRESS = 3;
  MANIFEST_LOG = 4;
  MANIFEST_COMPLETE = 5;
  ROOT_CA_COMPLETE = 6;
  CLIENT_CERT_COMPLETE = 7;
  HAS_BACKEND_COMPLETE = 8;
  LIST_FILES_COMPLETE = 9;
  PEEK_FILE_COMPLETE = 10;
 }
 message DropBound {
  string message_id = 1;
  DropBoundType type = 2;
  bytes data = 3;
 }
@@ -0,0 +1,61 @@
 syntax = "proto3";
 message RpcError {
  string error = 1;
 }
 /// Certificates
 message RootCertQuery {}
 message RootCertResponse {
  string cert = 1;
  string priv = 2;
 }
 message ClientCertQuery {
  string client_id = 1;
  string client_name = 2;
  string root_cert = 3;
  string root_priv = 4;
 }
 message ClientCertResponse {
  string cert = 1;
  string priv = 2;
 }
 /// Manifest generation
 message GenerateManifest {
  string version_dir = 1;
 }
 message ManifestProgress {
  float progress = 1;
 }
 message ManifestLog {
  string log_line = 1;
 }
 message ManifestComplete {
  string manifest = 1;
 }
 /// Backend tools
 message HasBackendQuery {
  string path = 1;
 }
 message HasBackendResponse {
  bool result = 1;
 }
 message ListFilesQuery {
  string path = 1;
 }
 message ListFilesResponse {
  repeated string files = 1;
 }
 message PeekFileQuery {
  string path = 1;
  string filename = 2;
 }
 message PeekFileResponse {
  uint64 size = 1;
 }
@@ -0,0 +1,14 @@
 syntax = "proto3";
 message ServerGamesQuery {}
 message ServerGamesResponse {
    message SkeletonGame {
        message SkeletonVersion {
            string version_id = 1;
        }
        string id = 1;
        repeated SkeletonVersion versions = 2;
    }
    repeated SkeletonGame games = 1;
 }
@@ -0,0 +1,39 @@
 syntax = "proto3";
 message VersionQuery {
  string version_id = 1;
 }
 message VersionResponse {
  message Manifest {
    string version = 1;
    message ChunkData {
      message FileEntry {
        string filename = 1;
        uint64 start = 2;
        uint64 length = 3;
        fixed32 permissions = 4;
      }
      repeated FileEntry files = 1;
      string checksum = 2;
      bytes iv = 3;
    }
    map<string, ChunkData> chunks = 2;
    uint64 size = 3;
    bytes key = 4;
  }
  Manifest manifest = 1;
  message LibrarySource {
    enum LibraryBackend {
      FILESYSTEM = 0;
      FLAT_FILESYSTEM = 1;
    }
    string options = 1; /// JSON
    string id = 2;
    LibraryBackend backend = 3;
  }
  LibrarySource source = 2;
  string library_path = 3;
  string version_path = 4;
 }
@@ -0,0 +1,37 @@
 use crate::proto::version::version_response::Manifest;
 fn fixed_length<T, const N: usize>(v: Vec<T>) -> [T; N] {
    v.try_into()
        .unwrap_or_else(|v: Vec<T>| panic!("Expected a Vec of length {} but it was {}", N, v.len()))
 }
 pub fn convert_protobuf_manifest(source: Manifest) -> droplet_rs::manifest::Manifest {
    droplet_rs::manifest::Manifest {
        version: source.version,
        chunks: source
            .chunks
            .into_iter()
            .map(|(id, chunk_data)| {
                (
                    id,
                    droplet_rs::manifest::ChunkData {
                        files: chunk_data
                            .files
                            .into_iter()
                            .map(|file_entry| droplet_rs::manifest::FileEntry {
                                filename: file_entry.filename,
                                start: file_entry.start.try_into().unwrap(),
                                length: file_entry.length.try_into().unwrap(),
                                permissions: file_entry.permissions,
                            })
                            .collect(),
                        checksum: chunk_data.checksum,
                        iv: fixed_length(chunk_data.iv),
                    },
                )
            })
            .collect(),
        size: source.size,
        key: fixed_length(source.key),
    }
 }
@@ -0,0 +1,78 @@
 use std::{path::PathBuf, time::Instant};
 use droplet_rs::{
    manifest::Manifest,
    versions::{create_backend_constructor, types::VersionBackend},
 };
 use log::warn;
 use reqwest::StatusCode;
 use serde_json::Value;
 use crate::{
    conversions::convert_protobuf_manifest,
    proto::version::{VersionResponse, version_response::library_source::LibraryBackend},
    server::download::fetch_version_data,
    state::AppState,
    util::ErrorOption,
 };
 pub struct DownloadContext {
    pub(crate) manifest: Manifest,
    pub(crate) backend: Box<dyn VersionBackend + Send + Sync + 'static>,
    last_access: Instant,
 }
 impl DownloadContext {
    #[must_use] 
    pub fn last_access(&self) -> Instant {
        self.last_access
    }
    pub fn reset_last_access(&mut self) {
        self.last_access = Instant::now();
    }
 }
 pub async fn create_download_context(
    app_state: &AppState,
    game_id: String,
    version_name: String,
 ) -> Result<DownloadContext, ErrorOption> {
    let version_data = fetch_version_data(app_state, game_id, version_name.clone()).await?;
    let backend = create_backend(&version_data)?;
    let download_context = DownloadContext {
        manifest: convert_protobuf_manifest(version_data.manifest.unwrap()),
        backend,
        last_access: Instant::now(),
    };
    Ok(download_context)
 }
 fn create_backend(
    version_data: &VersionResponse,
 ) -> Result<Box<dyn VersionBackend + Send + Sync>, StatusCode> {
    let base_path = serde_json::from_str::<Value>(&version_data.source.options)
        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
    let base_path = base_path.get("baseDir").unwrap().as_str().unwrap();
    let version_path = PathBuf::from(base_path);
    let version_path = version_path.join(version_data.library_path.clone());
    let version_path = match version_data.source.backend.unwrap() {
        LibraryBackend::FILESYSTEM => version_path.join(version_data.version_path.clone()),
        LibraryBackend::FLAT_FILESYSTEM => version_path,
    };
    if !version_path.exists() {
        warn!("{} path doesn't exist for version", version_path.display());
        return Err(StatusCode::INTERNAL_SERVER_ERROR);
    }
    let backend =
        create_backend_constructor(&version_path).ok_or(StatusCode::INTERNAL_SERVER_ERROR)?;
    let backend = backend()
        .inspect_err(|err| warn!("failed to create version backend: {err:?}"))
        .map_err(|_| StatusCode::INTERNAL_SERVER_ERROR)?;
    Ok(backend)
 }
@@ -0,0 +1,122 @@
 use std::{
    collections::HashMap,
    sync::Arc,
    task::Poll,
 };
 use axum::{
    Json,
    body::Body,
    extract::State,
    http::{HeaderMap, HeaderValue},
    response::IntoResponse,
 };
 use bytes::BufMut;
 use reqwest::{StatusCode, header::CONTENT_TYPE};
 use serde::{Deserialize, Serialize};
 use serde_json::json;
 use std::io::Write;
 use tokio::io::AsyncRead;
 use tokio_util::io::ReaderStream;
 use crate::{server::download::fetch_instance_games, state::AppState};
 pub async fn healthcheck() -> StatusCode {
    StatusCode::OK
 }
 #[derive(Deserialize)]
 pub struct InvalidateBody {
    game: String,
    version: String,
 }
 pub async fn invalidate(
    State(state): State<Arc<AppState>>,
    Json(payload): Json<InvalidateBody>,
 ) -> StatusCode {
    state.context_cache.remove(&(payload.game, payload.version));
    StatusCode::OK
 }
 struct SpeedtestStream {
    remaining: usize,
 }
 impl SpeedtestStream {
    pub fn new() -> Self {
        SpeedtestStream {
            remaining: 1024 * 1024 * 50,
        }
    }
    fn content_length(&self) -> usize {
        self.remaining
    }
 }
 const ZERO: [u8; 1024] = [0u8; _];
 impl AsyncRead for SpeedtestStream {
    fn poll_read(
        mut self: std::pin::Pin<&mut Self>,
        _cx: &mut std::task::Context<'_>,
        buf: &mut tokio::io::ReadBuf<'_>,
    ) -> Poll<std::io::Result<()>> {
        if self.remaining > 0 {
            let mut writer = buf.writer();
            let amount = writer.write(&ZERO);
            match amount {
                Ok(amount) => self.remaining -= amount,
                Err(err) => return Poll::Ready(Err(err)),
            }
        }
        Poll::Ready(Ok(()))
    }
 }
 pub async fn speedtest() -> Result<impl IntoResponse, StatusCode> {
    let speedtest = SpeedtestStream::new();
    let ct = speedtest.content_length();
    let speedtest_stream = ReaderStream::new(speedtest);
    let body = Body::from_stream(speedtest_stream);
    let mut headers = HeaderMap::new();
    headers.insert("Content-Type", "application/octet-stream".parse().unwrap());
    headers.insert("Content-Length", ct.into());
    Ok((headers, body))
 }
 #[derive(Serialize)]
 #[serde(rename_all = "camelCase")]
 struct GameData {
    version_id: String,
    compression: String,
 }
 #[derive(Serialize)]
 struct Manifest {
    content: HashMap<String, Vec<GameData>>,
 }
 pub async fn manifest(State(state): State<Arc<AppState>>) -> Result<impl IntoResponse, StatusCode> {
    let games = fetch_instance_games(&state).await?;
    let mut content = HashMap::new();
    for game in games {
        content.insert(
            game.id,
            game.versions
                .into_iter()
                .map(|v| GameData {
                    version_id: v.version_id,
                    compression: "none".to_owned(),
                })
                .collect::<Vec<GameData>>(),
        );
    }
    let mut headers = HeaderMap::new();
    headers.insert(CONTENT_TYPE, HeaderValue::from_static("application/json"));
    Ok((headers, json!(Manifest { content }).to_string()))
 }
@@ -0,0 +1,3 @@
 pub mod handlers;
 pub mod serve;
 pub mod download;
@@ -0,0 +1,197 @@
 use std::{
    io::Error,
    sync::{Arc, LazyLock},
 };
 use aes::cipher::{KeyIvInit, StreamCipher};
 use axum::{
    body::Body,
    extract::{Path, State},
    http::HeaderMap,
    response::IntoResponse,
 };
 use bytes::Bytes;
 use dashmap::{DashMap, mapref::one::RefMut};
 use droplet_rs::{
    manifest::ChunkData,
    versions::types::{MinimumFileObject, VersionFile},
 };
 use futures_util::{Stream, StreamExt, stream};
 use log::{error, info};
 use pin_project_lite::pin_project;
 use reqwest::StatusCode;
 use tokio::sync::{Semaphore, SemaphorePermit};
 use tokio_util::io::ReaderStream;
 use crate::{
    DownloadContext, GLOBAL_CONTEXT_SEMAPHORE, downloads::download::create_download_context,
    state::AppState,
 };
 type Aes128Ctr64LE = ctr::Ctr64LE<aes::Aes128>;
 pin_project! {
    struct SemaphoreStream<'a, T>
        where T: Stream
    {
        #[pin]
        stream: T,
        semaphore: SemaphorePermit<'a>,
    }
 }
 impl<'a, T: Stream> SemaphoreStream<'a, T> {
    fn new(stream: T, permit: SemaphorePermit<'a>) -> Self {
        Self {
            stream,
            semaphore: permit,
        }
    }
 }
 impl<T: Stream> Stream for SemaphoreStream<'_, T>
 where
    T: Stream,
 {
    type Item = T::Item;
    fn poll_next(
        self: std::pin::Pin<&mut Self>,
        cx: &mut std::task::Context<'_>,
    ) -> std::task::Poll<Option<Self::Item>> {
        let this = self.project();
        this.stream.poll_next(cx)
    }
 }
 static SEMPAHORE_COUNT: LazyLock<usize> =
    LazyLock::new(|| file_open_limit::get().expect("failed to count max open files"));
 static FILE_SEMAPHORE: LazyLock<Semaphore> = LazyLock::new(|| Semaphore::new(*SEMPAHORE_COUNT));
 pub async fn serve_file(
    State(state): State<Arc<AppState>>,
    Path((game_id, version_name, chunk_id)): Path<(String, String, String)>,
 ) -> Result<impl IntoResponse, StatusCode> {
    let context_cache = &state.context_cache;
    let mut context = get_or_create_context(&state, context_cache, game_id, version_name).await?;
    context.reset_last_access();
    let chunk_data = lookup_chunk(&chunk_id, &context)?;
    if chunk_data.files.len() >= *SEMPAHORE_COUNT {
        return Err(StatusCode::INSUFFICIENT_STORAGE);
    }
    let permit = FILE_SEMAPHORE
        .acquire_many(chunk_data.files.len().try_into().unwrap())
        .await
        .map_err(|_| StatusCode::INSUFFICIENT_STORAGE)?;
    let mut streams = Vec::with_capacity(chunk_data.files.len());
    let mut content_length = 0;
    for file_entry in &chunk_data.files {
        let reader = get_file_reader(
            &mut context,
            file_entry.filename.clone(),
            file_entry.start,
            file_entry.start + file_entry.length,
        )
        .await?;
        let stream = ReaderStream::new(reader);
        streams.push(stream);
        content_length += file_entry.length;
    }
    let stream = stream::iter(streams).flatten();
    let mut cipher = Aes128Ctr64LE::new(&context.manifest.key.into(), &chunk_data.iv.into());
    let encrypted_stream = stream.chunks(16).map(move |raw| -> Result<Bytes, Error> {
        let data: Result<Vec<Bytes>, Error> = raw.into_iter().collect();
        let mut data = data?.concat();
        cipher.apply_keystream(&mut data);
        Ok(data.into())
    });
    let permit_stream = SemaphoreStream::new(encrypted_stream, permit);
    let body: Body = Body::from_stream(permit_stream);
    let mut headers = HeaderMap::new();
    headers.insert("Content-Type", "application/octet-stream".parse().unwrap());
    headers.insert("Content-Length", content_length.into());
    Ok((headers, body))
 }
 async fn acquire_permit<'a>() -> SemaphorePermit<'a> {
    return GLOBAL_CONTEXT_SEMAPHORE
        .acquire()
        .await
        .expect("failed to acquire semaphore");
 }
 /**
 * Needs to be cloned for reference reasons
 */
 fn lookup_chunk(
    chunk_id: &str,
    context: &RefMut<'_, (String, String), DownloadContext>,
 ) -> Result<ChunkData, StatusCode> {
    context
        .manifest
        .chunks
        .get(chunk_id)
        .cloned()
        .ok_or(StatusCode::NOT_FOUND)
 }
 async fn get_file_reader(
    context: &mut RefMut<'_, (String, String), DownloadContext>,
    relative_filename: String,
    start: usize,
    end: usize,
 ) -> Result<Box<dyn MinimumFileObject>, StatusCode> {
    context
        .backend
        .reader(
            &VersionFile {
                relative_filename: relative_filename.clone(),
                permission: 0,
                size: 0,
            },
            start as u64,
            end as u64,
        )
        .await
        .map_err(|v| {
            error!("reader error for '{relative_filename}': {v:?}");
            StatusCode::INTERNAL_SERVER_ERROR
        })
 }
 async fn get_or_create_context<'a>(
    state: &Arc<AppState>,
    context_cache: &'a DashMap<(String, String), DownloadContext>,
    game_id: String,
    version_name: String,
 ) -> Result<RefMut<'a, (String, String), DownloadContext>, StatusCode> {
    let key = (game_id.clone(), version_name.clone());
    if let Some(context) = context_cache.get_mut(&key) {
        Ok(context)
    } else {
        let permit = acquire_permit().await;
        // Check if it's been done while we've been sitting here
        if let Some(already_done) = context_cache.get_mut(&key) {
            Ok(already_done)
        } else {
            info!("generating context for {game_id}...");
            let context_result =
                create_download_context(state, game_id.clone(), version_name.clone()).await?;
            state.context_cache.insert(key.clone(), context_result);
            info!("continuing download for {game_id}");
            drop(permit);
            Ok(context_cache.get_mut(&key).unwrap())
        }
    }
 }
@@ -0,0 +1,101 @@
 use std::{
    path::Path,
    sync::Arc,
 };
 use anyhow::anyhow;
 use droplet_rs::versions::types::VersionBackend;
 use protobuf::Message;
 use crate::{
    proto::{
        core::{DropBoundType, TorrentialBound},
        droplet::{
            HasBackendQuery, HasBackendResponse, ListFilesQuery, ListFilesResponse, PeekFileQuery,
            PeekFileResponse,
        },
    },
    server::DropServer,
 };
 pub async fn has_backend_rpc(
    server: Arc<DropServer>,
    message: TorrentialBound,
 ) -> Result<(), anyhow::Error> {
    let has_backend = HasBackendQuery::parse_from_bytes(&message.data)?;
    let has_backend = {
        let path = Path::new(&has_backend.path);
        let backend_constructor = droplet_rs::versions::create_backend_constructor(path);
        backend_constructor.is_some()
    };
    let mut response = HasBackendResponse::new();
    response.result = has_backend;
    server
        .send_message(
            DropBoundType::HAS_BACKEND_COMPLETE,
            response,
            Some(message.message_id),
        )
        .await?;
    Ok(())
 }
 fn create_backend(path: &String) -> Result<Box<dyn VersionBackend + Send + Sync>, anyhow::Error> {
    let backend_constructor = droplet_rs::versions::create_backend_constructor(Path::new(path))
        .ok_or(anyhow!("backend doesn't exist at path {path}"))?;
    let backend = backend_constructor()?;
    Ok(backend)
 }
 pub async fn list_files_rpc(
    server: Arc<DropServer>,
    message: TorrentialBound,
 ) -> Result<(), anyhow::Error> {
    let query = ListFilesQuery::parse_from_bytes(&message.data)?;
    let mut backend = create_backend(&query.path)?;
    let files = backend.list_files().await?;
    let mut response = ListFilesResponse::new();
    response.files = files.into_iter().map(|v| v.relative_filename).collect();
    server
        .send_message(
            DropBoundType::LIST_FILES_COMPLETE,
            response,
            Some(message.message_id),
        )
        .await?;
    Ok(())
 }
 pub async fn peek_file_rpc(
    server: Arc<DropServer>,
    message: TorrentialBound,
 ) -> Result<(), anyhow::Error> {
    let query = PeekFileQuery::parse_from_bytes(&message.data)?;
    let mut backend = create_backend(&query.path)?;
    let file_peek = backend.peek_file(query.filename).await?;
    let mut response = PeekFileResponse::new();
    response.size = file_peek.size;
    server
        .send_message(
            DropBoundType::PEEK_FILE_COMPLETE,
            response,
            Some(message.message_id),
        )
        .await?;
    Ok(())
 }
@@ -0,0 +1,71 @@
 use std::sync::Arc;
 use anyhow::anyhow;
 use protobuf::Message as _;
 use crate::{
    proto::{
        core::{DropBoundType, TorrentialBound},
        droplet::{ClientCertQuery, ClientCertResponse, RootCertResponse},
    },
    server::DropServer,
 };
 pub async fn generate_root_ca_rpc(
    server: Arc<DropServer>,
    message: TorrentialBound,
 ) -> Result<(), anyhow::Error> {
    let manifest = droplet_rs::ssl::generate_root_ca()?;
    let mut manifest = manifest.into_iter();
    let mut root_ca = RootCertResponse::new();
    root_ca.cert = manifest
        .next()
        .ok_or(anyhow!("root ca generation missing cert"))?;
    root_ca.priv_ = manifest
        .next()
        .ok_or(anyhow!("root ca generation missing priv"))?;
    server
        .send_message(
            DropBoundType::ROOT_CA_COMPLETE,
            root_ca,
            Some(message.message_id),
        )
        .await?;
    Ok(())
 }
 pub async fn generate_client_cert_rpc(
    server: Arc<DropServer>,
    message: TorrentialBound,
 ) -> Result<(), anyhow::Error> {
    let generate_message = ClientCertQuery::parse_from_bytes(&message.data)?;
    let cert = droplet_rs::ssl::generate_client_certificate(
        generate_message.client_id,
        generate_message.client_name,
        generate_message.root_cert,
        generate_message.root_priv,
    )?;
    let mut cert = cert.into_iter();
    let mut client_cert = ClientCertResponse::new();
    client_cert.cert = cert
        .next()
        .ok_or(anyhow!("client cert generation missing cert"))?;
    client_cert.priv_ = cert
        .next()
        .ok_or(anyhow!("client cert generation missing priv"))?;
    server
        .send_message(
            DropBoundType::CLIENT_CERT_COMPLETE,
            client_cert,
            Some(message.message_id),
        )
        .await?;
    Ok(())
 }
@@ -0,0 +1,81 @@
 use std::{
    path::PathBuf,
    sync::{Arc, LazyLock},
 };
 use log::info;
 use protobuf::Message;
 use serde_json::json;
 use tokio::{spawn, sync::Semaphore};
 use crate::{
    proto::{
        core::{DropBoundType, TorrentialBound},
        droplet::{GenerateManifest, ManifestComplete, ManifestLog, ManifestProgress},
    },
    server::DropServer,
 };
 // TODO: re-write the droplet interface so it takes a 'static reference instead of an arc
 static READER_SEMAPHORE: LazyLock<Arc<Semaphore>> = LazyLock::new(|| {
    let cores = std::env::var("READER_THREADS")
        .ok()
        .and_then(|v| str::parse::<usize>(&v).ok())
        .unwrap_or(num_cpus::get() / 2);
    info!("using {cores} import threads");
    Arc::new(Semaphore::new(cores))
 });
 pub async fn generate_manifest_rpc(
    server: Arc<DropServer>,
    message: TorrentialBound,
 ) -> Result<(), anyhow::Error> {
    let manifest_message = GenerateManifest::parse_from_bytes(&message.data)?;
    let manifest = droplet_rs::manifest::generate_manifest_rusty(
        &PathBuf::from(manifest_message.version_dir),
        |progress| {
            let mut progress_message = ManifestProgress::new();
            progress_message.progress = progress;
            let server = server.clone();
            let message_id = message.message_id.clone();
            spawn(async move {
                let _ = server
                    .send_message(
                        DropBoundType::MANIFEST_PROGRESS,
                        progress_message,
                        Some(message_id),
                    )
                    .await;
            });
        },
        |log_line| {
            let mut progress_log = ManifestLog::new();
            progress_log.log_line = log_line;
            let server = server.clone();
            let message_id = message.message_id.clone();
            spawn(async move {
                let _ = server
                    .send_message(DropBoundType::MANIFEST_LOG, progress_log, Some(message_id))
                    .await;
            });
        },
        Some(READER_SEMAPHORE.clone()),
    )
    .await?;
    let mut manifest_complete = ManifestComplete::new();
    manifest_complete.manifest = json!(manifest).to_string();
    server
        .send_message(
            DropBoundType::MANIFEST_COMPLETE,
            manifest_complete,
            Some(message.message_id),
        )
        .await?;
    Ok(())
 }
@@ -0,0 +1,33 @@
 use std::sync::Arc;
 use log::warn;
 use crate::{proto::{core::{DropBoundType, TorrentialBound}, droplet::RpcError}, server::DropServer};
 pub mod cert;
 pub mod manifest;
 pub mod backend;
 pub async fn call_rpc<T>(server: Arc<DropServer>, message: TorrentialBound, rpc: T)
 where
    T: AsyncFn(Arc<DropServer>, TorrentialBound) -> Result<(), anyhow::Error>,
 {
    let message_id = message.message_id.clone();
    let message_type = message.type_.enum_value().unwrap();
    let result = rpc(server.clone(), message).await;
    if let Err(err) = result {
        warn!("rpc call for {message_type:?} failed with error: {err:?}");
        let mut manifest_err = RpcError::new();
        manifest_err.error = err.to_string();
        let _ = server
            .send_message(
                DropBoundType::RPC_ERROR,
                manifest_err,
                Some(message_id),
            )
            .await
            .inspect_err(|err| {
                warn!("failed to send manifest err: {err:?}");
            });
    }
 }
@@ -0,0 +1,12 @@
 use tokio::sync::Semaphore;
 pub mod downloads;
 pub mod state;
 pub mod util;
 pub mod proto;
 pub mod conversions;
 pub mod server;
 pub mod droplet;
 pub use downloads::download::DownloadContext;
 static GLOBAL_CONTEXT_SEMAPHORE: Semaphore = Semaphore::const_new(1);
@@ -0,0 +1,102 @@
 use std::{
    env::set_current_dir,
    sync::Arc,
    time::{Duration, Instant},
 };
 use axum::{
    Router,
    routing::{get, post},
 };
 use dashmap::DashMap;
 use log::info;
 use simple_logger::SimpleLogger;
 use tokio::{runtime::Handle, spawn, time};
 use torrential::{
    downloads::{handlers, serve},
    server::create_drop_server,
    state::AppState,
 };
 const CONTEXT_TTL: u64 = 10 * 60;
 #[tokio::main]
 async fn main() {
    initialise_logger();
    if let Ok(working_directory) = std::env::var("WORKING_DIRECTORY") {
        info!("moving to working directory {working_directory}");
        set_current_dir(working_directory).expect("failed to change working directory");
    }
    let metrics = Handle::current().metrics();
    info!("using {} threads", metrics.num_workers());
    let server = create_drop_server()
        .await
        .expect("failed to connect to drop server");
    let shared_state = Arc::new(AppState {
        context_cache: DashMap::new(),
        server,
    });
    let interval_shared_state = shared_state.clone();
    spawn(async move {
        let shared_state = interval_shared_state;
        let mut interval = time::interval(Duration::from_mins(1));
        loop {
            interval.tick().await;
            let keys = shared_state
                .context_cache
                .iter()
                .map(|v| v.key().clone())
                .collect::<Vec<(String, String)>>();
            for key in keys {
                let last_access = if let Some(context) = shared_state.context_cache.get(&key) {
                    context.last_access()
                } else {
                    Instant::now()
                };
                if last_access.elapsed().as_secs() >= CONTEXT_TTL {
                    shared_state.context_cache.remove(&key);
                    info!("cleaned context: {key:?}");
                }
            }
        }
    });
    let app = setup_app(shared_state);
    serve(app).await.expect("failed to serve app");
 }
 fn setup_app(shared_state: Arc<AppState>) -> Router {
    Router::new()
        .route(
            "/api/v1/depot/content/{game_id}/{version_name}/{chunk_id}",
            get(serve::serve_file),
        )
        .route("/api/v1/depot/manifest.json", get(handlers::manifest))
        .route("/api/v1/depot/speedtest", get(handlers::speedtest))
        .route("/healthcheck", get(handlers::healthcheck))
        .route("/invalidate", post(handlers::invalidate))
        .with_state(shared_state)
 }
 async fn serve(app: Router) -> Result<(), std::io::Error> {
    let listener = tokio::net::TcpListener::bind("0.0.0.0:5000")
        .await
        .expect("failed to bind tcp server");
    info!("started depot server");
    axum::serve(listener, app).await
 }
 fn initialise_logger() {
    SimpleLogger::new()
        .with_level(log::LevelFilter::Info)
        .init()
        .expect("failed to init logger");
 }
@@ -0,0 +1,37 @@
 use crate::{
    proto::{
        core::DropBoundType,
        manifest::{ServerGamesQuery, ServerGamesResponse, server_games_response::SkeletonGame},
        version::{VersionQuery, VersionResponse},
    },
    state::AppState,
    util::ErrorOption,
 };
 pub async fn fetch_version_data(
    app_state: &AppState,
    _game_id: String,
    version_id: String,
 ) -> Result<VersionResponse, ErrorOption> {
    let mut query = VersionQuery::new();
    query.version_id = version_id;
    let message_id = app_state
        .server
        .send_message(DropBoundType::VERSION_QUERY, query, None)
        .await?;
    let response: VersionResponse = app_state.server.wait_for_message_id(&message_id).await?;
    Ok(response)
 }
 pub async fn fetch_instance_games(app_state: &AppState) -> Result<Vec<SkeletonGame>, ErrorOption> {
    let message_id = app_state
        .server
        .send_message(DropBoundType::SERVER_GAMES_QUERY, ServerGamesQuery::new(), None)
        .await?;
    let response: ServerGamesResponse = app_state.server.wait_for_message_id(&message_id).await?;
    Ok(response.games)
 }
@@ -0,0 +1,194 @@
 use std::{mem, sync::Arc};
 use anyhow::anyhow;
 use log::{info, warn};
 use protobuf::{EnumOrUnknown, Message};
 use tokio::{
    io::{AsyncReadExt, AsyncWriteExt as _, BufReader},
    net::{
        TcpListener,
        tcp::{OwnedReadHalf, OwnedWriteHalf},
    },
    spawn,
    sync::Mutex,
 };
 use waitmap::WaitMap;
 use crate::{
    droplet::{
        backend::{has_backend_rpc, list_files_rpc, peek_file_rpc},
        call_rpc,
        cert::{generate_client_cert_rpc, generate_root_ca_rpc},
        manifest::generate_manifest_rpc,
    },
    proto::core::{DropBound, DropBoundType, TorrentialBound, TorrentialBoundType},
 };
 pub mod download;
 macro_rules! spawn_rpc {
    ($myself:ident, $message:ident, $func_name:ident) => {
        spawn(async move { call_rpc($myself.clone(), $message, $func_name).await });
    };
 }
 pub struct DropServer {
    server: TcpListener,
    write_stream: Mutex<OwnedWriteHalf>,
    waitmap: WaitMap<String, TorrentialBound>,
 }
 impl DropServer {
    /**
    Reads from the socket, and tries to parse it into a message,
    and then updates the waitmap with the corresponding message ID
    and content
    */
    async fn recieve_loop(
        myself: Arc<DropServer>,
        buffered_reader: &mut BufReader<OwnedReadHalf>,
    ) -> Result<(), anyhow::Error> {
        let mut length_buffer: [u8; 8] = [0; 8];
        buffered_reader.read_exact(&mut length_buffer).await?;
        let length = usize::from_le_bytes(length_buffer);
        let mut buffer = vec![0; length];
        buffered_reader.read_exact(&mut buffer).await?;
        let message = TorrentialBound::parse_from_bytes(&buffer)
            .expect("response didn't deserialize correctly");
        match message.type_.unwrap() {
            TorrentialBoundType::GENERATE_MANIFEST => {
                spawn_rpc!(myself, message, generate_manifest_rpc);
            }
            TorrentialBoundType::GENERATE_ROOT_CA => {
                spawn_rpc!(myself, message, generate_root_ca_rpc);
            }
            TorrentialBoundType::GENERATE_CLIENT_CERT => {
                spawn_rpc!(myself, message, generate_client_cert_rpc);
            }
            TorrentialBoundType::LIST_FILES_QUERY => {
                spawn_rpc!(myself, message, list_files_rpc);
            }
            TorrentialBoundType::HAS_BACKEND_QUERY => {
                spawn_rpc!(myself, message, has_backend_rpc);
            }
            TorrentialBoundType::PEEK_FILE_QUERY => {
                spawn_rpc!(myself, message, peek_file_rpc);
            }
            _ => {
                myself.waitmap.insert(message.message_id.clone(), message);
            }
        }
        Ok(())
    }
    /**
    Long-lived subroutine that never returns, runs the `recieve_loop` and reconnects
    as necessary
    */
    async fn recieve_subroutine(myself: Arc<DropServer>, read_stream: OwnedReadHalf) -> ! {
        let mut buffered_reader = BufReader::new(read_stream);
        loop {
            if let Err(err) = Self::recieve_loop(myself.clone(), &mut buffered_reader).await {
                warn!("server disconnected with error: {err:?}");
                let (drop_stream, _) = myself
                    .server
                    .accept()
                    .await
                    .expect("failed to accept new listener");
                let (read, mut write) = drop_stream.into_split();
                info!("reconnected to drop server");
                let mut lock = myself.write_stream.lock().await;
                mem::swap(&mut *lock, &mut write);
                let mut new_reader = BufReader::new(read);
                mem::swap(&mut buffered_reader, &mut new_reader);
            }
        }
    }
    /**
    Uses the waitmap to wait for a response from a query
    */
    pub async fn wait_for_message_id<T>(&self, message_id: &str) -> Result<T, anyhow::Error>
    where
        T: protobuf::Message,
    {
        let message = self
            .waitmap
            .wait(message_id)
            .await
            .ok_or(anyhow!("no response returned for value"))?;
        let message = message.value();
        if message.type_.unwrap() == crate::proto::core::TorrentialBoundType::ERROR {
            Err(anyhow!(String::from_utf8(message.data.clone()).unwrap()))
        } else {
            let response = T::parse_from_bytes(&message.data)?;
            Ok(response)
        }
    }
    /**
    Sends a message, returning the message ID
    */
    pub async fn send_message<T>(
        &self,
        message_type: DropBoundType,
        message: T,
        message_id: Option<String>,
    ) -> Result<String, anyhow::Error>
    where
        T: protobuf::Message,
    {
        let mut query = DropBound::new();
        query.message_id = message_id.unwrap_or(uuid::Uuid::new_v4().to_string());
        query.type_ = EnumOrUnknown::new(message_type);
        query.data = Vec::new();
        message.write_to_vec(&mut query.data)?;
        let mut buf = Vec::new();
        query.write_to_vec(&mut buf)?;
        {
            let mut mutex_lock = self.write_stream.lock().await;
            mutex_lock.write(&buf.len().to_le_bytes()).await?;
            mutex_lock.write_all(&buf).await?;
        };
        Ok(query.message_id)
    }
 }
 /**
 Spins up the TCP listener, and waits for the first client to connect
 Also starts the recieve subroutine
 */
 pub async fn create_drop_server() -> Result<Arc<DropServer>, anyhow::Error> {
    let server = TcpListener::bind("127.0.0.1:33148").await?;
    let (drop_stream, _) = server.accept().await?;
    let (read, write) = drop_stream.into_split();
    let client = Arc::new(DropServer {
        server,
        write_stream: Mutex::new(write),
        waitmap: WaitMap::new(),
    });
    spawn(DropServer::recieve_subroutine(client.clone(), read));
    info!("created client subroutine");
    Ok(client)
 }
@@ -0,0 +1,10 @@
 use std::sync::Arc;
 use dashmap::DashMap;
 use crate::{DownloadContext, server::DropServer};
 pub struct AppState {
    pub context_cache: DashMap<(String, String), DownloadContext>,
    pub server: Arc<DropServer>,
 }
@@ -0,0 +1,37 @@
 use log::error;
 use reqwest::StatusCode;
 #[derive(Debug)]
 pub struct ErrorOption(Result<StatusCode, anyhow::Error>);
 impl From<anyhow::Error> for ErrorOption {
    fn from(value: anyhow::Error) -> Self {
        Self(Err(value))
    }
 }
 impl From<reqwest::Error> for ErrorOption {
    fn from(value: reqwest::Error) -> Self {
        Self(Err(value.into()))
    }
 }
 impl From<url::ParseError> for ErrorOption {
    fn from(value: url::ParseError) -> Self {
        Self(Err(value.into()))
    }
 }
 impl From<StatusCode> for ErrorOption {
    fn from(value: StatusCode) -> Self {
        Self(Ok(value))
    }
 }
 impl From<ErrorOption> for StatusCode {
    fn from(value: ErrorOption) -> Self {
        match value.0 {
            Ok(status) => status,
            Err(err) => {
                error!("{err:?}");
                Self::INTERNAL_SERVER_ERROR
            }
        }
    }
 }
		`@@ -0,0 +1,4 @@`
							`# torrential`

							A Rust webserver designed to hook into the Drop server and serve the content files, but at a lightning fast speed. Designed to be built into the Drop Docker container, and proxied automatically via NGINX at `/api/v1/depot`.