api: better handling of helper errors to distinguish error codes

src/api/k2v/batch.rs

@@ -4,12 +4,12 @@ use serde::{Deserialize, Serialize};
 
 use garage_table::{EnumerationOrder, TableSchema};
 
-use garage_model::k2v::causality::*;
 use garage_model::k2v::item_table::*;
 
 use crate::helpers::*;
 use crate::k2v::api_server::{ReqBody, ResBody};
 use crate::k2v::error::*;
+use crate::k2v::item::parse_causality_token;
 use crate::k2v::range::read_range;
 
 pub async fn handle_insert_batch(
@@ -23,7 +23,7 @@ pub async fn handle_insert_batch(
 
 	let mut items2 = vec![];
 	for it in items {
-		let ct = it.ct.map(|s| CausalContext::parse_helper(&s)).transpose()?;
+		let ct = it.ct.map(|s| parse_causality_token(&s)).transpose()?;
 		let v = match it.v {
 			Some(vs) => DvvsValue::Value(
 				BASE64_STANDARD
@@ -281,7 +281,8 @@ pub(crate) async fn handle_poll_range(
 			query.seen_marker,
 			timeout_msec,
 		)
-		.await?;
+		.await
+		.map_err(pass_helper_error)?;
 
 	if let Some((items, seen_marker)) = resp {
 		let resp = PollRangeResponse {