unify hex builders

2 files changed, 4 insertions, 13 deletions

diff --git a/src/api/dashboard/mod.rs b/src/api/dashboard/mod.rs
index 87f5aeb..c284f6f 100644
--- a/src/api/dashboard/mod.rs
+++ b/src/api/dashboard/mod.rs
@@ -31,7 +31,7 @@ use tokio::time::Instant;
 use crate::locks::MutexExt;
 use crate::state::AppState;
 use crate::swarm::{links, members, topology};
-use crate::transport::Link;
+use crate::transport::{Hex, Link};
 
 /// How often the snapshot is built and compared, while anyone looks.
 const TICK: Duration = Duration::from_secs(2);
@@ -411,11 +411,7 @@ fn page() -> &'static (String, String) {
         let growing = serde_json::to_string(GROWING).unwrap_or_else(|_| "[]".to_owned());
         let page = PAGE.replace(GROWING_MARK, &growing);
         // Of the page with its list: a new list is a new version too.
-        let version: String = Sha256::digest(page.as_bytes())
-            .iter()
-            .take(8)
-            .map(|byte| format!("{byte:02x}"))
-            .collect();
+        let version = Hex(&Sha256::digest(page.as_bytes())[..8]).to_string();
         let served = page.replace(PAGE_VERSION_MARK, &version);
         (version, served)
     })
diff --git a/src/api/store.rs b/src/api/store.rs
index bd4ae8e..c67df85 100644
--- a/src/api/store.rs
+++ b/src/api/store.rs
@@ -24,6 +24,7 @@ use super::{ApiError, store_status};
 use crate::document::meta;
 use crate::document::store::{self, StoreError, paths_related};
 use crate::state::{AppState, ReadSource};
+use crate::transport::Hex;
 
 #[derive(Debug, Default, Deserialize)]
 pub(crate) struct ReadQuery {
@@ -209,13 +210,7 @@ pub(crate) async fn put_store_entry(
 }
 
 fn etag_for(bytes: &[u8]) -> String {
-    let digest = Sha256::digest(bytes);
-    let hex = digest
-        .iter()
-        .map(|byte| format!("{byte:02x}"))
-        .collect::<String>();
-
-    format!("\"{hex}\"")
+    format!("\"{}\"", Hex(&Sha256::digest(bytes)))
 }
 
 fn parse_key_path(key: &str) -> Result<Vec<String>, StatusCode> {