Added metrics to JSON, switched from json to serde_json, extracted all JSON related functionality into a function in utils.rs

src/registry.rs

@@ -1,6 +1,7 @@
 use std::sync::Mutex;
 
 use rayon::iter::{IntoParallelRefIterator, ParallelIterator};
+use serde_json::Value;
 use ureq::Error;
 
 use http_auth::parse_challenges;
@@ -34,7 +35,7 @@ pub fn get_latest_digest(image: &Image, token: Option<&String>) -> Image {
         Ok(response) => response,
         Err(Error::Status(401, response)) => {
             if token.is_some() {
-                error!("Failed to authenticate with given token!\n{}", token.unwrap())
+                error!("Failed to authenticate to registry {} with given token!\n{}", &image.registry, token.unwrap())
             } else {
                 return get_latest_digest(
                     image,
@@ -94,13 +95,18 @@ pub fn get_token(images: Vec<&Image>, auth_url: &str) -> String {
             error!("Token request failed!\n{}", e)
         }
     };
-    let parsed_token_response = match json::parse(&raw_response) {
+    let parsed_token_response: Value = match serde_json::from_str(&raw_response) {
         Ok(parsed) => parsed,
         Err(e) => {
             error!("Failed to parse server response\n{}", e)
         }
     };
-    parsed_token_response["token"].to_string()
+    parsed_token_response
+        .get("token")
+        .unwrap()
+        .as_str()
+        .unwrap()
+        .to_string()
 }
 
 fn parse_www_authenticate(www_auth: &str) -> String {