refactor: make user key optional, add stable_rollout function

Author: SSebo

Cargo.lock

@@ -1,7 +1,7 @@
 [package]
 edition = "2021"
 name = "feature-probe-server-sdk"
-version = "1.1.1"
+version = "1.2.1"
 license = "Apache-2.0"
 authors = ["maintain@featureprobe.com"]
 description = "FeatureProbe Server Side SDK for Rust"
@@ -43,11 +43,16 @@ thiserror = "1.0"
 tracing = "0.1"
 url = "2"
 
-feature-probe-event-std = { optional = true, version = "1.1.2", package="feature-probe-event" }
-feature-probe-event-tokio = { optional = true, version = "1.1.2", features=["use_tokio"], default-features=false, package="feature-probe-event" }
+feature-probe-event-std = { optional = true, version = "1.1.2", package = "feature-probe-event" }
+feature-probe-event-tokio = { optional = true, version = "1.1.2", features = [
+    "use_tokio",
+], default-features = false, package = "feature-probe-event" }
 
-reqwest = { optional = true, version = "0.11", default-features = false, features = ["rustls-tls", "json"] }
-tokio = {optional = true, version = "1", features = ["full"]}
+reqwest = { optional = true, version = "0.11", default-features = false, features = [
+    "rustls-tls",
+    "json",
+] }
+tokio = { optional = true, version = "1", features = ["full"] }
 ureq = { optional = true, version = "2.4" }
 
 [dev-dependencies]
@@ -60,4 +65,3 @@ rusty-hook = "^0.11.2"
 tokio = { version = "1", features = ["full"] }
 tracing-subscriber = "0.3"
 feature-probe-server = "1.2.1"
-

Cargo.toml

@@ -85,8 +85,7 @@ fn main() {
 You can use sdk to check which variation a particular user will receive for a given feature flag.
 
 ```rust
-let user_id = /* unique user id in your business logic */
-let user = FPUser::new(user_id).with("name", "bob");
+let user = FPUser::new().with("name", "bob");
 let show_feature = fp.bool_value("bool_toggle", &user, false);
 
 if show_feature {
@@ -102,7 +101,7 @@ You could do unit testing for each variation:
 
 ```rust
 let fp = FeatureProbe::new_for_test("toggle_1", Value::Bool(false));
-let u = FPUser::new("key");
+let u = FPUser::new();
 assert_eq!(fp.bool_value("toggle_1", &u, true), false);
 
 let mut toggles: HashMap<String, Value> = HashMap::new();

README.md

@@ -22,8 +22,8 @@ fn criterion_benchmark(c: &mut Criterion) {
     path.push("resources/fixtures/repo.json");
     let json_str = fs::read_to_string(path).unwrap();
     let repo = load_json(&json_str).unwrap();
-    let user_default = FPUser::new("key11");
-    let user_hit = FPUser::new("key11").with("city", "1");
+    let user_default = FPUser::new();
+    let user_hit = FPUser::new().with("city", "1");
     let fp = FeatureProbe::new_with("secret key".to_string(), repo);
 
     c.bench_function("bench_bool_toggle_defualt", |b| {

benches/bench.rs

@@ -30,7 +30,7 @@ async fn main() {
         }
     };
 
-    let user = FPUser::new("unique user key");
+    let user = FPUser::new();
     let enable = fp.bool_value("campaign_enable", &user, false);
     println!("Result => campaign_enable : {:?}", enable);