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feat(tauri): add low-disk streamed install action

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NEXT_STEPS item 1 called out that streamed install was still CLI-only
because the Tauri app started the peer with no stream provider. Users can now
choose an explicit "Low disk install" action from the game detail modal for
remote-only games instead of taking the default archive-preserving download
path.

The GUI command queues a normal peer detail fetch first so the peer database
has the file metadata needed for source validation. A small pending handoff in
Tauri routes the resulting GotGameFiles event into StreamInstallGame instead
of DownloadGameFiles, and clears that pending state on no-peer or download
failure events. This keeps the existing download continuation untouched for
the default action.

The external unrar stream provider moved from the CLI harness into
lanspread-peer so CLI and Tauri use the same implementation. Tauri resolves
the bundled unrar sidecar path and injects that provider at peer startup;
falling back to the noop provider keeps peer startup alive if the sidecar
cannot be resolved, while the streamed install operation still fails safely.

Test Plan:
- just fmt
- just test
- just frontend-test
- just clippy
- just build
- git diff --check

Refs: NEXT_STEPS.md item 1
This commit is contained in:
ddidderr
2026-06-07 21:39:02 +02:00
parent 389511f620
commit 40697a73e5
13 changed files with 623 additions and 436 deletions
Download Patch File Download Diff File Expand all files Collapse all files
crates/lanspread-peer-cli/src/lib.rs
+1 -415
View File
@@ -5,24 +5,15 @@
use std::{
net::SocketAddr,
path::{Path, PathBuf},
process::Stdio,
time::Duration,
};
use bytes::Bytes;
use eyre::{Context, OptionExt};
use lanspread_peer::{StreamInstallFuture, StreamInstallProvider, UnpackFuture, Unpacker};
use lanspread_proto::StreamInstallFrame;
use lanspread_peer::{UnpackFuture, Unpacker};
use serde::Serialize;
use serde_json::{Value, json};
use tokio::{
io::{AsyncRead, AsyncReadExt},
sync::mpsc,
};
use tokio_util::sync::CancellationToken;
pub const DEFAULT_FIXTURE_VERSION: &str = "20250101";
const STREAM_CHUNK_SIZE: usize = 256 * 1024;
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct CommandEnvelope {
@@ -270,356 +261,6 @@ impl Unpacker for ExternalUnrarUnpacker {
}
}
pub struct ExternalUnrarStreamProvider {
program: PathBuf,
}
impl ExternalUnrarStreamProvider {
#[must_use]
pub fn new(program: PathBuf) -> Self {
Self { program }
}
}
impl StreamInstallProvider for ExternalUnrarStreamProvider {
fn stream_archive<'a>(
&'a self,
archive: &'a Path,
frames: mpsc::Sender<StreamInstallFrame>,
cancel_token: CancellationToken,
) -> StreamInstallFuture<'a> {
Box::pin(async move {
let listing = unrar_listing(&self.program, archive).await?;
let archive_name = archive
.file_name()
.and_then(|name| name.to_str())
.unwrap_or("archive.eti")
.to_string();
send_stream_frame(
&frames,
StreamInstallFrame::ArchiveBegin {
archive_name: archive_name.clone(),
solid: listing.solid,
unpacked_size: listing.unpacked_size(),
},
)
.await?;
stream_unrar_entries(
&self.program,
archive,
&listing.entries,
&frames,
cancel_token.clone(),
)
.await?;
send_stream_frame(&frames, StreamInstallFrame::ArchiveEnd { archive_name }).await
})
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
struct RarListing {
solid: bool,
entries: Vec<RarEntry>,
}
impl RarListing {
fn unpacked_size(&self) -> u64 {
self.entries
.iter()
.filter(|entry| entry.kind == RarEntryKind::File)
.map(|entry| entry.size)
.sum()
}
}
#[derive(Debug, Clone, PartialEq, Eq)]
struct RarEntry {
relative_path: String,
kind: RarEntryKind,
size: u64,
crc32: Option<u32>,
}
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
enum RarEntryKind {
File,
Directory,
}
#[derive(Default)]
struct RarEntryDraft {
relative_path: Option<String>,
kind: Option<RarEntryKind>,
size: Option<u64>,
crc32: Option<u32>,
}
async fn unrar_listing(program: &Path, archive: &Path) -> eyre::Result<RarListing> {
let output = tokio::process::Command::new(program)
.arg("lt")
.arg("-cfg-")
.arg(archive)
.output()
.await?;
if !output.status.success() {
eyre::bail!(
"unrar lt failed for {} with status {}: {}",
archive.display(),
output.status,
String::from_utf8_lossy(&output.stderr)
);
}
parse_unrar_listing(&String::from_utf8_lossy(&output.stdout))
}
fn parse_unrar_listing(output: &str) -> eyre::Result<RarListing> {
let mut solid = false;
let mut entries = Vec::new();
let mut current = RarEntryDraft::default();
for line in output.lines() {
let trimmed = line.trim();
if let Some(details) = trimmed.strip_prefix("Details:") {
solid = details.to_ascii_lowercase().contains("solid");
continue;
}
if let Some(name) = trimmed.strip_prefix("Name:") {
push_rar_entry(&mut entries, std::mem::take(&mut current))?;
current.relative_path = Some(name.trim().to_string());
continue;
}
if let Some(kind) = trimmed.strip_prefix("Type:") {
current.kind = match kind.trim() {
"File" => Some(RarEntryKind::File),
"Directory" => Some(RarEntryKind::Directory),
_ => None,
};
continue;
}
if let Some(size) = trimmed.strip_prefix("Size:") {
current.size = Some(size.trim().parse()?);
continue;
}
if let Some(crc) = trimmed.strip_prefix("CRC32:") {
current.crc32 = Some(u32::from_str_radix(crc.trim(), 16)?);
}
}
push_rar_entry(&mut entries, current)?;
Ok(RarListing { solid, entries })
}
fn push_rar_entry(entries: &mut Vec<RarEntry>, draft: RarEntryDraft) -> eyre::Result<()> {
let Some(relative_path) = draft.relative_path else {
return Ok(());
};
let Some(kind) = draft.kind else {
return Ok(());
};
let (size, crc32) = match kind {
RarEntryKind::File => {
let size = draft
.size
.ok_or_else(|| eyre::eyre!("RAR file entry {relative_path} has no Size"))?;
let crc32 = draft
.crc32
.ok_or_else(|| eyre::eyre!("RAR file entry {relative_path} has no CRC32"))?;
(size, Some(crc32))
}
RarEntryKind::Directory => (0, None),
};
entries.push(RarEntry {
relative_path,
kind,
size,
crc32,
});
Ok(())
}
async fn stream_unrar_entries(
program: &Path,
archive: &Path,
entries: &[RarEntry],
frames: &mpsc::Sender<StreamInstallFrame>,
cancel_token: CancellationToken,
) -> eyre::Result<()> {
let mut child = tokio::process::Command::new(program)
.arg("p")
.arg("-inul")
.arg("-cfg-")
.arg(archive)
.stdout(Stdio::piped())
.stderr(Stdio::null())
.spawn()?;
let result = async {
let mut stdout = child
.stdout
.take()
.ok_or_eyre("unrar stdout was not captured")?;
let mut buffer = vec![0_u8; STREAM_CHUNK_SIZE];
for entry in entries {
if cancel_token.is_cancelled() {
eyre::bail!("streamed archive {} was cancelled", archive.display());
}
match entry.kind {
RarEntryKind::Directory => {
send_stream_frame(
frames,
StreamInstallFrame::Directory {
relative_path: entry.relative_path.clone(),
},
)
.await?;
}
RarEntryKind::File => {
let Some(crc32) = entry.crc32 else {
eyre::bail!("RAR file entry {} has no CRC32", entry.relative_path);
};
send_stream_frame(
frames,
StreamInstallFrame::FileBegin {
relative_path: entry.relative_path.clone(),
size: entry.size,
crc32,
},
)
.await?;
stream_unrar_file_from_stdout(
&mut stdout,
archive,
entry,
frames,
&mut buffer,
&cancel_token,
)
.await?;
send_stream_frame(
frames,
StreamInstallFrame::FileEnd {
relative_path: entry.relative_path.clone(),
},
)
.await?;
}
}
}
let extra =
read_unrar_stdout(&mut stdout, &mut buffer[..1], &cancel_token, archive).await?;
if extra != 0 {
eyre::bail!(
"unrar produced bytes after listed entries for {}",
archive.display()
);
}
let status = wait_unrar_child(&mut child, &cancel_token, archive).await?;
if !status.success() {
eyre::bail!(
"unrar p failed for {} with status {status}",
archive.display()
);
}
Ok(())
}
.await;
if result.is_err() {
let _ = child.kill().await;
}
result
}
async fn stream_unrar_file_from_stdout(
stdout: &mut (impl AsyncRead + Unpin),
archive: &Path,
entry: &RarEntry,
frames: &mpsc::Sender<StreamInstallFrame>,
buffer: &mut [u8],
cancel_token: &CancellationToken,
) -> eyre::Result<()> {
let mut remaining = entry.size;
while remaining > 0 {
let read_len = usize::try_from(remaining.min(buffer.len() as u64))?;
let read =
read_unrar_stdout(stdout, &mut buffer[..read_len], cancel_token, archive).await?;
if read == 0 {
eyre::bail!(
"unrar ended while streaming {} from {}; {remaining} bytes missing",
entry.relative_path,
archive.display()
);
}
send_stream_frame(
frames,
StreamInstallFrame::FileChunk {
bytes: Bytes::copy_from_slice(&buffer[..read]),
},
)
.await?;
remaining = remaining.saturating_sub(u64::try_from(read)?);
}
Ok(())
}
async fn read_unrar_stdout(
stdout: &mut (impl AsyncRead + Unpin),
buffer: &mut [u8],
cancel_token: &CancellationToken,
archive: &Path,
) -> eyre::Result<usize> {
tokio::select! {
() = cancel_token.cancelled() => {
eyre::bail!("streamed archive {} was cancelled", archive.display());
}
read = stdout.read(buffer) => Ok(read?),
}
}
async fn wait_unrar_child(
child: &mut tokio::process::Child,
cancel_token: &CancellationToken,
archive: &Path,
) -> eyre::Result<std::process::ExitStatus> {
tokio::select! {
() = cancel_token.cancelled() => {
let _ = child.kill().await;
eyre::bail!("streamed archive {} was cancelled", archive.display());
}
status = child.wait() => Ok(status?),
}
}
async fn send_stream_frame(
frames: &mpsc::Sender<StreamInstallFrame>,
frame: StreamInstallFrame,
) -> eyre::Result<()> {
frames
.send(frame)
.await
.map_err(|_| eyre::eyre!("streamed install frame receiver closed"))
}
pub fn result_line(id: &Option<Value>, command: &str, data: Value) -> eyre::Result<String> {
output_line(json!({
"type": "result",
@@ -723,61 +364,6 @@ mod tests {
);
}
#[test]
fn parses_unrar_technical_listing() {
let listing = parse_unrar_listing(
r#"
Archive: game.eti
Details: RAR 5, solid
Name: bin/payload.bin
Type: File
Size: 123
CRC32: 38B488A7
Name: bin
Type: Directory
"#,
)
.expect("listing should parse");
assert!(listing.solid);
assert_eq!(
listing.entries,
vec![
RarEntry {
relative_path: "bin/payload.bin".to_string(),
kind: RarEntryKind::File,
size: 123,
crc32: Some(0x38B4_88A7),
},
RarEntry {
relative_path: "bin".to_string(),
kind: RarEntryKind::Directory,
size: 0,
crc32: None,
},
]
);
}
#[test]
fn rejects_unrar_file_entries_without_crc32() {
let err = parse_unrar_listing(
r#"
Archive: game.eti
Details: RAR 5
Name: bin/payload.bin
Type: File
Size: 123
"#,
)
.expect_err("file entries without CRC32 should be rejected");
assert!(err.to_string().contains("has no CRC32"));
}
#[tokio::test]
async fn fixture_unpacker_creates_install_payload() {
let temp = TempDir::new("lanspread-peer-cli-fixture");
crates/lanspread-peer-cli/src/main.rs
+1 -1
View File
@@ -16,6 +16,7 @@ use lanspread_db::db::{Game, GameCatalog, GameFileDescription};
use lanspread_peer::{
ActiveOperation,
ActiveOperationKind,
ExternalUnrarStreamProvider,
InstallOperation,
NoopStreamInstallProvider,
PeerCommand,
@@ -33,7 +34,6 @@ use lanspread_peer_cli::{
CliCommand,
CommandEnvelope,
DEFAULT_FIXTURE_VERSION,
ExternalUnrarStreamProvider,
ExternalUnrarUnpacker,
FixtureSeed,
FixtureUnpacker,