the-benchmarker/web-frameworks · error

Failed to build/compose settings for profile

Error message

Failed to build/compose settings for profile `{profile_str}`: {err}

What it means

reinhardt-web's get_settings() composes ProjectSettings from base.toml, the profile-specific <profile>.toml, and REINHARDT_-prefixed environment overrides via build_composed::<ProjectSettings>(). If any source fails to load/parse or the merged values do not satisfy ProjectSettings, the unwrap_or_else panics naming the profile and the underlying error.

Solutions

1. Check the embedded err in the panic message: ensure settings/<profile>.toml exists for the current REINHARDT_ENV value (default profile is 'local')
2. Fix TOML syntax/type errors in base.toml or the profile file according to the deserialization error
3. Set REINHARDT_ENV to a profile that has a corresponding toml file, or create that file
4. Replace the panic in get_settings with a Result-returning API so misconfiguration surfaces as a startup error with context instead of a panic
5. Verify REINHARDT_-prefixed environment variable values parse into the expected field types

Example fix

// before
REINHARDT_ENV=production cargo run
// -> panic: Failed to build/compose settings for profile `production`: ... No such file

// after
ls settings/  # base.toml local.toml
cp settings/local.toml settings/production.toml  # then edit per-env values
export REINHARDT_ENV=production

// before starting the app, verify the profile file and required keys exist
let profile = std::env::var("REINHARDT_ENV").unwrap_or_else(|_| "local".into());
let path = format!("settings/{profile}.toml");
if !std::path::Path::new("settings/base.toml").exists()
    || !std::path::Path::new(&path).exists()
{
    eprintln!("missing settings file for profile '{profile}' (expected {path})");
    std::process::exit(1);
}
// optionally parse-check the TOML first:
// toml::from_str::<toml::Value>(&std::fs::read_to_string(&path)?)?;

null

// get_settings panics on config failure; isolate it at startup
let settings = std::panic::catch_unwind(|| reinhardt_web::config::settings::get_settings())
    .unwrap_or_else(|_| {
        eprintln!("failed to compose settings; check settings/*.toml and REINHARDT_ENV");
        std::process::exit(1);
    });

When it happens

Trigger: Calling get_settings() when settings/base.toml or settings/<REINHARDT_ENV>.toml is missing, unreadable, contains invalid TOML, or fails type/required-field validation during build_composed::<ProjectSettings>() — e.g. REINHARDT_ENV is set to a profile with no corresponding toml file.

Common situations: REINHARDT_ENV set to production/staging but settings/production.toml was never committed; a typo in a toml key that deserialization rejects; wrong value type in a config file; deploy environment lacks the settings directory because packaging excluded it.

Understand the failure class

Background: "Config file not found": what it means and how to fix it in docker-sync, Maven, Vagrant, Turborepo and other tools — this error's family across 60 libraries.

Related errors

• Failed to get current directory
• Failed to parse app.zl
• Failed to parse app.zl

AI-assisted analysis of the-benchmarker/web-frameworks@3795a31d72 (2026-09-15). Data as JSON: /api/errors/4bd4880fd68a46e6. Report an issue: GitHub.

Appendix: source

Thrown at rust/reinhardt-web/src/config/settings.rs:98

    // Build settings by merging sources in priority order.
    // `build_composed::<T>()` uses `MergeStrategy::Deep` by default, so a
    // single key in `production.toml` overrides only that key — sibling
    // entries inside the same nested table inherit from `base.toml`.
    SettingsBuilder::new()
        .profile(profile)
        // Lowest priority: Default values
        .add_source(DefaultSource::new())
        // Medium priority: Base TOML file
        .add_source(TomlFileSource::new(settings_dir.join("base.toml")))
        // Profile priority: Environment-specific TOML file
        .add_source(TomlFileSource::new(
            settings_dir.join(format!("{}.toml", profile_str)),
        ))
        // Highest priority: explicit process environment overrides
        .add_source(HighPriorityEnvSource::new().with_prefix("REINHARDT_"))
        .build_composed::<ProjectSettings>()
        .unwrap_or_else(|err| {
            panic!("Failed to build/compose settings for profile `{profile_str}`: {err}")
        })
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_get_settings() {
        // Smoke test: ensures settings load without panic and required fields are present
        let settings = get_settings();
        assert!(
            !settings.core.secret_key.is_empty(),
            "secret_key should be populated from settings sources"
        );
    }
}

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