chore: make delay time in fake wallet configurable

crates/cdk-mintd/Cargo.toml

@@ -36,6 +36,7 @@ home = "0.5.5"
 url = "2.3"
 utoipa = { version = "4", optional = true }
 utoipa-swagger-ui = { version = "4", features = ["axum"], optional = true }
+rand = "0.8.5"
 
 [features]
 swagger = ["cdk-axum/swagger", "dep:utoipa", "dep:utoipa-swagger-ui"]

crates/cdk-mintd/src/config.rs

@@ -3,6 +3,7 @@ use std::path::PathBuf;
 use cdk::nuts::{CurrencyUnit, PublicKey};
 use cdk::Amount;
 use config::{Config, ConfigError, File};
+use rand::Rng;
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Clone, Serialize, Deserialize, Default)]
@@ -104,14 +105,21 @@ pub struct FakeWallet {
     pub supported_units: Vec<CurrencyUnit>,
     pub fee_percent: f32,
     pub reserve_fee_min: Amount,
+    pub min_delay_time: u64,
+    pub max_delay_time: u64,
 }
 
 impl Default for FakeWallet {
     fn default() -> Self {
+        let mut rng = rand::thread_rng();
+        let min_rang = rng.gen_range(1..=1000);
+        let max_rang = rng.gen_range(1..=1000);
         Self {
             supported_units: vec![CurrencyUnit::Sat],
             fee_percent: 0.02,
             reserve_fee_min: 2.into(),
+            min_delay_time: min_rang,
+            max_delay_time: max_rang,
         }
     }
 }

crates/cdk-mintd/src/setup.rs

@@ -216,12 +216,14 @@ impl LnBackendSetup for config::FakeWallet {
             min_fee_reserve: self.reserve_fee_min,
             percent_fee_reserve: self.fee_percent,
         };
+        // calculate
+        let delay_time = (self.min_delay_time + self.max_delay_time) / 2;
 
         let fake_wallet = cdk_fake_wallet::FakeWallet::new(
             fee_reserve,
             HashMap::default(),
             HashSet::default(),
-            3,
+            delay_time,
         );
 
         Ok(fake_wallet)