prevent unexpected memory usage by filter values from unknown source

src/index/value.rs

@@ -0,0 +1,37 @@
+use chrono::{DateTime, Utc};
+
+const NAME_MAX_LEN: usize = 125; // + 3 bytes for `...` offset @TODO optional
+
+/// The `Index` value
+pub struct Value {
+    pub time: DateTime<Utc>,
+    pub node: u64,
+    /// Isolate by applying internal filter on value set
+    name: Option<String>,
+}
+
+impl Value {
+    /// Create new `Self` with current timestamp
+    pub fn new(node: u64, name: Option<String>) -> Self {
+        Self {
+            time: Utc::now(),
+            node,
+            name: filter_name(name),
+        }
+    }
+    /// Get reference to the safely constructed `name` member
+    pub fn name(&self) -> Option<&String> {
+        self.name.as_ref()
+    }
+}
+
+/// Prevent unexpected memory usage on store values from unknown source
+fn filter_name(value: Option<String>) -> Option<String> {
+    value.map(|v| {
+        if v.len() > NAME_MAX_LEN {
+            format!("{}...", &v[..NAME_MAX_LEN])
+        } else {
+            v
+        }
+    })
+}