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feat(pageserver): support evaluate boolean flags (#12024)

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## Problem

Part of https://github.com/neondatabase/neon/issues/11813

## Summary of changes

* Support evaluate boolean flags.
* Add docs on how to handle errors.
* Add test cases based on real PostHog config.

Signed-off-by: Alex Chi Z <chi@neon.tech>
This commit is contained in:
Alex Chi Z.
2025-05-27 22:29:15 +08:00
committed by GitHub
parent 30adf8e2bd
commit f0bb93a9c9
2 changed files with 404 additions and 91 deletions
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29
pageserver/src/feature_resolver.rs
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@@ -45,6 +45,10 @@ impl FeatureResolver {
}
/// Evaluate a multivariate feature flag. Currently, we do not support any properties.
///
/// Error handling: the caller should inspect the error and decide the behavior when a feature flag
/// cannot be evaluated (i.e., default to false if it cannot be resolved). The error should *not* be
/// propagated beyond where the feature flag gets resolved.
pub fn evaluate_multivariate(
&self,
flag_key: &str,
@@ -62,4 +66,29 @@ impl FeatureResolver {
))
}
}
/// Evaluate a boolean feature flag. Currently, we do not support any properties.
///
/// Returns `Ok(())` if the flag is evaluated to true, otherwise returns an error.
///
/// Error handling: the caller should inspect the error and decide the behavior when a feature flag
/// cannot be evaluated (i.e., default to false if it cannot be resolved). The error should *not* be
/// propagated beyond where the feature flag gets resolved.
pub fn evaluate_boolean(
&self,
flag_key: &str,
tenant_id: TenantId,
) -> Result<(), PostHogEvaluationError> {
if let Some(inner) = &self.inner {
inner.feature_store().evaluate_boolean(
flag_key,
&tenant_id.to_string(),
&HashMap::new(),
)
} else {
Err(PostHogEvaluationError::NotAvailable(
"PostHog integration is not enabled".to_string(),
))
}
}
}