Struct ShadowConfig 

pub struct ShadowConfig {
    pub shadow_timeout: Duration,
    pub ignore: Vec<IgnoreField>,
    /* private fields */
}

Knobs the shadower needs.

Fields

shadow_timeout: Duration

Max time the shadow leg is allowed. After this we drop it and flag a ShadowTimeout on the outcome — never blocks the primary.

ignore: Vec<IgnoreField>

Fields to skip in the divergence check.

Implementations

impl ShadowConfig

pub fn full_sample() -> Self

Mirror every request, default timeout 2s.

pub fn sample_rate(self, percent: u32) -> Self

Set sampling rate as a percentage (0..=100). Values >100 are clamped.

pub fn shadow_timeout(self, d: Duration) -> Self

Override the shadow timeout.

pub fn ignore(self, field: IgnoreField) -> Self

Add a field to skip in the divergence diff.

pub fn sample_rate_percent(&self) -> u32

Configured sample rate (0..=100).

pub fn should_shadow(&self, key: &[u8]) -> bool

Decide whether this request should be mirrored. Bucketing is sticky on the key — the same key always gets the same yes/no for a given sample_rate. SHA-256 (mod 100) is cheap and avoids an RNG dep.

Trait Implementations

impl Clone for ShadowConfig

fn clone(&self) -> ShadowConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ShadowConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ShadowConfig

fn default() -> Self

Returns the “default value” for a type.