fix(rog-control-center): reuse shared D-Bus system connections from rog-dbus to prevent fd leak - #338
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📝 WalkthroughSummary by CodeRabbit
WalkthroughThe PR centralizes blocking and asynchronous system D-Bus connections in ChangesD-Bus connection sharing
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This PR reuses shared D-Bus connections and improves setup error handling to prevent descriptor exhaustion and related failures; no actionable merge-blocking risk remains, so it is merge-ready after normal checks. Suggested labels: 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@rog-control-center/src/ui/setup_aura.rs`:
- Around line 38-39: Update the Aura interface selection around AuraProxy and
ifaces.pop() to explicitly define and implement the intended device-selection
rule instead of relying on find_iface_async’s ascending sort and pop behavior;
preserve the existing no-interface error path and document the rule if selecting
the highest path is intentional.
In `@rog-control-center/src/ui/setup_system.rs`:
- Around line 28-41: Remove the function-level early returns from the D-Bus
connection and PlatformProxyBlocking setup, and scope their failure handling to
the supported_properties() block that requires the proxy. Preserve the existing
logging while allowing the page reset and sysfs telemetry loop to continue when
D-Bus or the platform proxy is unavailable.
In `@rog-dbus/src/lib.rs`:
- Around line 143-159: Update test_system_connection_blocking_singleton and
test_system_connection_async_singleton to handle unavailable system buses with
an explicit, visible skip instead of silently returning from if let Ok branches.
Preserve the singleton pointer assertions when connections are available, and
report the skip reason through the test framework’s established skip mechanism.
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rog-control-center/src/main.rsrog-control-center/src/ui/setup_aura.rsrog-control-center/src/ui/setup_fans.rsrog-control-center/src/ui/setup_gpu.rsrog-control-center/src/ui/setup_system.rsrog-control-center/src/zbus_proxies.rsrog-dbus/Cargo.tomlrog-dbus/src/lib.rs
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- GitHub Check: cargo build --workspace (Ubuntu / rustc 1.93)
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🔇 Additional comments (9)
rog-dbus/src/lib.rs (3)
18-35: LGTM!
37-50: LGTM!
70-74: 🎯 Functional Correctness | ⚡ Quick winBoth discovery helpers now key off
contains_key(&str)against a zbus interface-name map. The same assumption was copied into the async and blocking variant: that the map key borrows asstrwith matchingHashandEq. If that does not hold, the code fails to compile, or it compiles and every lookup quietly returns "Did not find {iface_name}". The old explicit string comparison had no such dependency.
rog-dbus/src/lib.rs#L70-L74: verify the key type ofget_managed_objects()against the pinned zbus version; if it does not implementBorrow<str>, compare the key explicitly withk.as_str() == iface_name.rog-dbus/src/lib.rs#L114-L118: apply the identical change to the blocking variant so the two helpers cannot drift.rog-control-center/src/zbus_proxies.rs (1)
71-73: LGTM!rog-control-center/src/main.rs (1)
74-75: LGTM!rog-control-center/src/ui/setup_fans.rs (1)
104-120: LGTM!rog-control-center/src/ui/setup_gpu.rs (1)
354-366: LGTM!rog-control-center/src/ui/setup_system.rs (1)
427-441: LGTM!rog-dbus/Cargo.toml (1)
21-21: 🎯 Functional CorrectnessNo change needed. The workspace enables
macros,sync, andrt, so the Tokio usage inrog-dbusis supported.> Likely an incorrect or invalid review comment.
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Inline comments:
In `@rog-dbus/Cargo.toml`:
- Around line 21-22: Separate the runtime-dependent asusd API from rog-dbus by
moving tokio runtime-dependent code and its associated API into an appropriate
asusd-specific layer, while keeping rog-dbus limited to the shared API. Update
the workspace dependency and feature wiring so asusctl no longer receives
runtime features through rog-dbus, preserving only the tokio capabilities
required by each crate.
In `@rog-dbus/src/lib.rs`:
- Around line 75-81: Update rog-dbus/src/lib.rs lines 75-81 in
find_iface_async_with_conn and lines 119-124 in find_iface_blocking_with_conn to
sort object paths by parsing their trailing segment numerically, with byte-order
comparison as the fallback; keep both helpers consistent. In
rog-control-center/src/ui/setup_aura.rs lines 37-47, make no direct change
because the existing “lowest path index” documentation becomes accurate after
the helper fix.
- Around line 18-28: Add a concise comment in system_connection_blocking
explaining that the initial get plus get_or_init may briefly create two
connections under a race, with the losing connection dropped intentionally
because OnceLock::get_or_try_init is unavailable; leave the existing
initialization logic unchanged.
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rog-control-center/src/main.rsrog-control-center/src/ui/setup_aura.rsrog-control-center/src/ui/setup_fans.rsrog-control-center/src/ui/setup_gpu.rsrog-control-center/src/ui/setup_system.rsrog-control-center/src/zbus_proxies.rsrog-dbus/Cargo.tomlrog-dbus/src/lib.rs
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🔇 Additional comments (7)
rog-dbus/src/lib.rs (2)
139-174: LGTM!
31-35: 🩺 Stability & AvailabilityNo runtime-lifetime issue exists in the current callers.
rog-control-centeris the only production caller and keeps its Tokio runtime alive until shutdown. Therog-dbustest uses zbus withasync-ioonly, notzbus/tokio.> Likely an incorrect or invalid review comment.rog-control-center/src/zbus_proxies.rs (1)
71-73: LGTM!rog-control-center/src/main.rs (1)
74-75: LGTM!rog-control-center/src/ui/setup_fans.rs (1)
104-120: LGTM!rog-control-center/src/ui/setup_gpu.rs (1)
354-366: LGTM!rog-control-center/src/ui/setup_system.rs (1)
80-97: LGTM!Also applies to: 425-439
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Actionable comments posted: 1
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Inline comments:
In `@rog-dbus/src/lib.rs`:
- Around line 23-31: Update system_connection_blocking to serialize initial
connection creation with an initialization mutex; recheck BLOCKING_CONN after
acquiring the mutex before calling Connection::system, and only publish a
successful connection so failed initialization remains retryable.
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Are you certain the minimal fix for the fd leak (if it even exists) is 200 lines of code? I haven't read the entire diff yet. But I don't think this change needs to be so big |
I can reduce it by removing the reuse of rog-dbus for dbus/zbus calls but then it would contain a duplication of these calls |
…rs (OpenGamingCollective#229) rog-control-center called find_iface and find_iface_async on periodic 2-second UI polling loops, opening a new zbus system connection on each call. Because proxies retain their originating connection, file descriptors (eventfd and unix domain sockets) accumulated until hitting the EMFILE (1024) limit and panicking. Reuse a singleton system connection across calls using OnceLock for blocking and OnceCell for async lookups in rog-control-center's zbus_proxies module.
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@Ghoul4500 I've reduced the patch to the absolutely minimum required |
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Description
In
rog-control-center,find_iface_asyncandfind_ifaceopened a newzbus::Connection::system()/zbus::blocking::Connection::system()on every invocation. When called inside recurring 2-second background polling tasks (e.g. for Armoury attributes, LEDs, and device status updates), new Unix domain sockets andeventfddescriptors accumulated continuously without reuse.After approximately 10–12 minutes, the process exhausted the default 1024 file descriptor limit (
EMFILE/os error 24: Too many open files), causingslint::run_event_loop_until_quit()and Wayland socket creation to fail with a panic.Key Changes:
rog-dbus: Implementedsystem_connection()(async viatokio::sync::OnceCell) andsystem_connection_blocking()(sync viastd::sync::OnceLock) to share a single process-wide D-Bus connection.rog-dbus: Updatedfind_iface_async,find_iface_blocking, andlist_iface_blockingto reuse the shared connections and added_with_connvariants.rog-control-center: Re-exportedfind_iface_asyncandfind_iface_blockingfromrog_dbusinzbus_proxies.rsand replaced independentConnection::system()allocations acrossmain.rsandui/setup_*.rsmodules.rog-control-center: Replaced.unwrap()calls during synchronous D-Bus setup insetup_system.rswith safe error propagation and logging.Fixes #229
Tested Hardware & Environment
Verification and testing:
cargo fmt --all -- --check)cargo clippy --all -- -D warnings/cargo check --all-targets)cargo test --all)cargo cranky)