style: improve use of std api

- replace get(0) by first()
lint message: accessing first element with `objs.get(0)`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#get_first
- use io::Error::other method available since Rust 1.87
lint message: this can be `std::io::Error::other(_)`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#io_other_error
- implement From<_> instead of Into<_>
lint message: an implementation of `From` is preferred since it gives you `Into<_>` for free where the reverse isn't true
help: `impl From<Local> for Foreign` is allowed by the orphan rules, for more information see
            https://doc.rust-lang.org/reference/items/implementations.html#trait-implementation-coherence
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#from_over_into
- use next_back instead of rev + next
lint message: manual backwards iteration
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#manual_next_back
- use saturating_sub instead of manual implement it
lint message: manual arithmetic check found
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#implicit_saturating_sub
- add Default implementation for Checksummer
use derived Default ans use it in new, as new set all value to None
lint message: you should consider adding a `Default` implementation for `Checksummer`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#new_without_default
- use `any` instead of `find` + `is_some`
lint message: called `is_some()` after searching an `Iterator` with `find`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#search_is_some
- replace `and_then` + `Some(_)` with `map`
lint message: using `Option.and_then(|x| Some(y))`, which is more succinctly expressed as `map(|x| y)`
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#bind_instead_of_map
- replace `skip_while` + `next` with `find`
lint message: called `skip_while(<p>).next()` on an `Iterator`
help: this is more succinctly expressed by calling `.find(!<p>)` instead
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#skip_while_next
- use `matches!` instead of manual implementation
lint message: match expression looks like `matches!` macro
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#match_like_matches_macro
- use `keys` and `values methods insteads of iterating and ignoring either the keys or values.
help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#iter_kv_map

src/api/s3/get.rs

@@ -400,15 +400,10 @@ async fn handle_get_full(
 	overrides: GetObjectOverrides,
 	checksum_mode: ChecksumMode,
 ) -> Result<Response<ResBody>, Error> {
-	let mut resp_builder = object_headers(
-		version,
-		version_meta,
-		meta_inner,
-		encryption,
-		checksum_mode,
-	)
-	.header(CONTENT_LENGTH, format!("{}", version_meta.size))
-	.status(StatusCode::OK);
+	let mut resp_builder =
+		object_headers(version, version_meta, meta_inner, encryption, checksum_mode)
+			.header(CONTENT_LENGTH, format!("{}", version_meta.size))
+			.status(StatusCode::OK);
 	getobject_override_headers(overrides, &mut resp_builder)?;
 
 	let stream = full_object_byte_stream(garage, version, version_data, encryption);
@@ -708,11 +703,7 @@ fn body_from_blocks_range(
 									Some(None)
 								} else {
 									// The chunk has an intersection with the requested range
-									let start_in_chunk = if *chunk_offset > begin {
-										0
-									} else {
-										begin - *chunk_offset
-									};
+									let start_in_chunk = begin.saturating_sub(*chunk_offset);
 									let end_in_chunk = if *chunk_offset + chunk_len < end {
 										chunk_len
 									} else {
@@ -773,10 +764,7 @@ fn error_stream_item<E: std::fmt::Display>(e: E) -> ByteStream {
 }
 
 fn std_error_from_read_error<E: std::fmt::Display>(e: E) -> std::io::Error {
-	std::io::Error::new(
-		std::io::ErrorKind::Other,
-		format!("Error while reading object data: {}", e),
-	)
+	std::io::Error::other(format!("Error while reading object data: {}", e))
 }
 
 // ----