feat(flags): Add basic property matching (#47)

feature-flags/Cargo.toml

@@ -26,6 +26,7 @@ serde_json = { workspace = true }
 thiserror = { workspace = true }
 serde-pickle = { version = "1.1.1"}
 sha1 = "0.10.6"
+regex = "1.10.4"
 
 [lints]
 workspace = true

feature-flags/README.md

@@ -0,0 +1,36 @@
+
+# Testing
+
+```
+cargo test --package feature-flags
+```
+
+### To watch changes
+
+```
+brew install cargo-watch
+```
+
+and then run:
+
+```
+cargo watch -x test --package feature-flags
+```
+
+To run a specific test:
+
+```
+cargo watch -x "test --package feature-flags --lib -- property_matching::tests::test_match_properties_math_operators --exact --show-output"
+```
+
+# Running
+
+```
+RUST_LOG=debug cargo run --bin feature-flags
+```
+
+# Format code
+
+```
+cargo fmt --package feature-flags
+```

feature-flags/src/flag_definitions.rs

@@ -16,7 +16,7 @@ pub const TEAM_FLAGS_CACHE_PREFIX: &str = "posthog:1:team_feature_flags_";
 #[derive(Debug, Deserialize)]
 pub enum GroupTypeIndex {}
 
-#[derive(Debug, Clone, Deserialize)]
+#[derive(Debug, Clone, PartialEq, Eq, Deserialize)]
 #[serde(rename_all = "snake_case")]
 pub enum OperatorType {
     Exact,
@@ -39,6 +39,9 @@ pub enum OperatorType {
 #[derive(Debug, Clone, Deserialize)]
 pub struct PropertyFilter {
     pub key: String,
+    // TODO: Probably need a default for value?
+    // incase operators like is_set, is_not_set are used
+    // not guaranteed to have a value, if say created via api
     pub value: serde_json::Value,
     pub operator: Option<OperatorType>,
     #[serde(rename = "type")]

feature-flags/src/flag_matching.rs

@@ -135,7 +135,6 @@ impl FeatureFlagMatcher {
         hasher.update(hash_key.as_bytes());
         let result = hasher.finalize();
         // :TRICKY: Convert the first 15 characters of the digest to a hexadecimal string
-        // not sure if this is correct, padding each byte as 2 characters
         let hex_str: String = result.iter().fold(String::new(), |mut acc, byte| {
             let _ = write!(acc, "{:02x}", byte);
             acc

feature-flags/src/lib.rs

@@ -2,6 +2,7 @@ pub mod api;
 pub mod config;
 pub mod flag_definitions;
 pub mod flag_matching;
+pub mod property_matching;
 pub mod redis;
 pub mod router;
 pub mod server;