statsig_rust/evaluation/
evaluator_context.rs

1use crate::evaluation::dynamic_value::DynamicValue;
2use crate::evaluation::evaluator_result::EvaluatorResult;
3use crate::event_logging::exposable_string::ExposableString;
4use crate::hashing::HashUtil;
5use crate::spec_store::SpecStoreData;
6use crate::specs_response::spec_types::{Rule, Spec};
7use crate::user::StatsigUserInternal;
8use crate::StatsigErr::StackOverflowError;
9use crate::{OverrideAdapter, StatsigErr};
10use std::collections::HashMap;
11use std::sync::Arc;
12
13const MAX_RECURSIVE_DEPTH: u16 = 300;
14
15pub struct EvaluatorContext<'a> {
16    pub user: &'a StatsigUserInternal<'a, 'a>,
17    pub spec_store_data: &'a SpecStoreData,
18    pub hashing: &'a HashUtil,
19    pub result: EvaluatorResult<'a>,
20    pub nested_count: u16,
21    pub app_id: Option<&'a DynamicValue>,
22    pub override_adapter: Option<&'a Arc<dyn OverrideAdapter>>,
23    pub nested_gate_memo: HashMap<&'a str, (bool, Option<&'a ExposableString>)>,
24    pub use_experimental_ua_parser: bool,
25}
26
27impl<'a> EvaluatorContext<'a> {
28    pub fn new(
29        user: &'a StatsigUserInternal,
30        spec_store_data: &'a SpecStoreData,
31        hashing: &'a HashUtil,
32        app_id: Option<&'a DynamicValue>,
33        override_adapter: Option<&'a Arc<dyn OverrideAdapter>>,
34        use_experimental_ua_parser: bool,
35    ) -> Self {
36        let result = EvaluatorResult::default();
37
38        Self {
39            user,
40            spec_store_data,
41            hashing,
42            app_id,
43            result,
44            override_adapter,
45            nested_count: 0,
46            nested_gate_memo: HashMap::new(),
47            use_experimental_ua_parser,
48        }
49    }
50
51    pub fn reset_result(&mut self) {
52        self.nested_count = 0;
53        self.result = EvaluatorResult::default();
54    }
55
56    pub fn finalize_evaluation(&mut self, spec: &Spec, rule: Option<&Rule>) {
57        self.result.sampling_rate = rule.and_then(|r| r.sampling_rate);
58        self.result.forward_all_exposures = spec.forward_all_exposures;
59
60        if self.nested_count > 0 {
61            self.nested_count -= 1;
62            return;
63        }
64
65        if self.result.secondary_exposures.is_empty() {
66            return;
67        }
68
69        if self.result.undelegated_secondary_exposures.is_some() {
70            return;
71        }
72
73        self.result.undelegated_secondary_exposures = Some(self.result.secondary_exposures.clone());
74    }
75
76    pub fn prep_for_nested_evaluation(&mut self) -> Result<(), StatsigErr> {
77        self.nested_count += 1;
78
79        self.result.bool_value = false;
80        self.result.json_value = None;
81
82        if self.nested_count > MAX_RECURSIVE_DEPTH {
83            return Err(StackOverflowError);
84        }
85
86        Ok(())
87    }
88}
statsig_rust/evaluation/evaluator_context.rs

statsig_rust/evaluation/
evaluator_context.rs
