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fix: give CEF a per-instance cache directory on native runs #671

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fix: give CEF a per-instance cache directory on native runs #671

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fix: give CEF a per-instance cache directory on native runs
wagenet Aug 11, 2026
0d9f28a
Merge branch 'main' into fix/cef-cache-location
srperens Aug 21, 2026
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20 changes: 20 additions & 0 deletions backend/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -299,6 +299,26 @@ fn main() -> anyhow::Result<()> {
std::process::exit(1);
});

// Give CEF (the `cefsrc` element behind HTML sources and DSK graphics) a
// per-instance cache directory. The strom-full Docker image sets
// GST_CEF_CACHE_LOCATION in its entrypoint, but native runs get Chromium's
// default, which warns
//
// Please customize CefSettings.root_cache_path for your application. Use
// of the default value may lead to unintended process singleton behavior.
//
// and makes Chromium's process singleton shared: a second Strom instance on
// the same machine cannot start any cefsrc element, failing in
// gst_base_src_start() so the flow start returns 500 "Element failed to
// change its state". Deriving the directory from the data directory keeps
// instances isolated, and gives CEF a warm on-disk profile, which also cuts
// repeat flow-start latency. An explicitly configured value always wins.
if std::env::var_os("GST_CEF_CACHE_LOCATION").is_none() {
if let Some(data_dir) = config.flows_path.parent() {
std::env::set_var("GST_CEF_CACHE_LOCATION", data_dir.join("cef-cache"));
}
}

// Initialize logging with optional file output and log level
let (log_reload_handle, default_log_filter) =
init_logging(config.log_file.as_ref(), config.log_level.as_ref()).unwrap_or_else(|e| {
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