add validation for env

Author: nikhilsinhaparseable

src/cli.rs

@@ -373,6 +373,7 @@ pub struct Options {
         long,
         env = "P_OTEL_ATTRIBUTES_ALLOWED_LIMIT",
         default_value = "200",
+        value_parser = validation::validate_otel_attributes_allowed_limit,
         help = "allowed limit for otel attributes"
     )]
     pub otel_attributes_allowed_limit: usize,

src/option.rs

@@ -173,4 +173,19 @@ pub mod validation {
             Err("Invalid value for max disk usage. It should be given as 90.0 for 90%".to_string())
         }
     }
+
+    pub fn validate_otel_attributes_allowed_limit(s: &str) -> Result<usize, String> {
+        if let Ok(size) = s.parse::<usize>() {
+            if (1..=200).contains(&size) {
+                Ok(size)
+            } else {
+                Err(format!(
+                    "Invalid value for size. It should be between 1 and {}",
+                    200
+                ))
+            }
+        } else {
+            Err("Invalid value for size. It should be given as integer value".to_string())
+        }
+    }
 }