init

02-runtime-check/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "runtime-check"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

02-runtime-check/src/main.rs

@@ -0,0 +1,55 @@
+#![allow(unused)]
+
+use std::collections::HashMap;
+
+struct CredentialManager {
+    locked: bool,
+    entries: HashMap<String, String>,
+}
+
+impl CredentialManager {
+    pub fn new() -> CredentialManager {
+        CredentialManager {
+            locked: false,
+            entries: HashMap::new(),
+        }
+    }
+
+    pub fn unlock(&self, master_secret: &str) -> Result<(), &'static str> {
+        if !self.locked {
+            return Err("already unlocked");
+        }
+        todo!()
+    }
+
+    pub fn set(&mut self, key: &str, secret: &str) -> Result<(), &'static str> {
+        if self.locked {
+            return Err("locked");
+        }
+        todo!()
+    }
+
+    pub fn get(&mut self, key: &str) -> Result<Option<&str>, &'static str> {
+        if self.locked {
+            return Err("locked");
+        }
+        todo!()
+    }
+
+    pub fn lock(&self) -> Result<(), &'static str> {
+        if self.locked {
+            return Err("already locked");
+        }
+        todo!()
+    }
+}
+
+fn main() -> Result<(), &'static str> {
+    let mut pw = CredentialManager::new();
+    pw.unlock("pssst")?;
+    pw.set("foo", "bar")?;
+    let val = pw.get("foo")?;
+    pw.lock()?;
+
+    Ok(())
+}