prevent unexpected memory usage by filter values from unknown source

src/index.rs

@@ -1,11 +1,7 @@
-use chrono::{DateTime, Utc};
-use std::collections::HashMap;
+mod value;
 
-pub struct Value {
-    pub time: DateTime<Utc>,
-    pub node: u64,
-    pub name: Option<String>,
-}
+use std::collections::HashMap;
+use value::Value;
 
 /// Collect processed info hashes to skip on the next iterations (for this session)
 /// * also contains optional meta info to export index as RSS or any other format
@@ -52,11 +48,7 @@ impl Index {
             .index
             .insert(
                 infohash,
-                Value {
-                    time: Utc::now(),
-                    node,
-                    name: if self.has_name { name } else { None },
-                },
+                Value::new(node, if self.has_name { name } else { None }),
             )
             .is_none()
         {

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
+        }
+    })
+}

src/main.rs

@@ -198,7 +198,7 @@ async fn main() -> Result<()> {
             for (k, v) in index.list() {
                 rss.push(
                     k,
-                    v.name.as_ref().unwrap_or(k),
+                    v.name().unwrap_or(k),
                     None, // @TODO
                     Some(&v.time.to_rfc2822()),
                 )?