Side A introduces the actual feature (ratio bounds enforcement across DSL parser, HTTP handler, and reducer) with substantial regression/integration test coverage, providing real user-facing validation and lasting behavior change. Side B is a small, valid follow-up bugfix correcting an ordering issue in A's own reducer logic (ghost items/pair marking), which is useful but narrower in scope and dependent on A's prior work.
constitution · epochs · watch · epoch 3
comparison
c_55666fe32c48 (tommy-mor) vs c_abd68b5e771a (tommy-mor)
download prompt · raw event · cmp_67e7915e6dfb44
council reasoning
A establishes the lasting vote-ratio invariant end-to-end (DSL parse, UI POST rejection, reducer drop, max≤100) with broad unit/integration/browser coverage. B only relocates A’s zero-ratio early-return before ensure_item/voted_pairs and tightens one test—important correctness, but a narrow follow-up versus A’s multi-layer design.
Side A establishes the core invariant that vote ratios must have both sides between 1 and 100 by enforcing it in the DSL parser, UI POST handler, and reducer, and adds regression tests covering parser and integration behavior. Side B is a worthwhile follow-up that fixes a reducer edge case by moving the zero-ratio early return before item registration and voted-pair insertion, preventing ghost state, but it is a narrower correction built on the broader validation introduced by Side A.
sides
A — c_55666fe32c48 (tommy-mor)
message
[aa0b175c] Enforce vote ratio constraints: both sides ≥ 1, max 100. Zero on either side produces no valid graph edge; ratios above 100 add no meaningful signal. Enforce in the DSL parser, browser POST handler, and reducer guard. Update browser pool test to use 99:1 instead of 100:0. Add unit and integration regression tests. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
diff preview
diff --git a/server/src/api/ui_html.rs b/server/src/api/ui_html.rs
index b79efdb4d52bd445a67f38cbfd61d3507d2b3014..bc8a0130b434cc7880a4bf16eb9237080c4aa383 100644
--- a/server/src/api/ui_html.rs
+++ b/server/src/api/ui_html.rs
@@ -243,11 +243,23 @@ async fn dispatch_ui_action(
let pool_id = pool.as_deref().and_then(|p| {
crate::path_types::ItemId::parse(p.trim()).map(|i| i.normalized_storage())
});
- let mut rl = ratio_left.trim().parse::<i32>().unwrap_or(0).max(0);
- let mut rr = ratio_right.trim().parse::<i32>().unwrap_or(0).max(0);
- if rl == 0 && rr == 0 {
- rl = 1;
- rr = 1;
+ let rl = ratio_left.trim().parse::<i32>().unwrap_or(0).max(0);
+ let rr = ratio_right.trim().parse::<i32>().unwrap_or(0).max(0);
+ if rl == 0 || rr == 0 {
+ return form_js_error(
+ err_tgt.as_ref(),
+ "invalid ratio",
+ "Both ratio sides must be ≥ 1.",
+ )
+ .into_response();
+ }
+ if rl > 100 || rr > 100 {
+ return form_js_error(
+ err_tgt.as_ref(),
+ "invalid ratio",
+ "Ratio sides must be ≤ 100.",
+ )
+ .into_response();
}
let text = format!(
diff --git a/server/src/dsl.rs b/server/src/dsl.rs
index faa8aac6616bc6ea2b102d08ae999c01a716ef6e..338feacc579a92bed291867cc0f2f62462737462 100644
--- a/server/src/dsl.rs
+++ b/server/src/dsl.rs
@@ -545,9 +545,14 @@ fn parse_block_prefixed_statement(
let ((ratio_left, ratio_right), k) = parse_comparison_at(s, i)
.ok_or_else(|| DslError::Parse(format!("invalid comparison near: {}", &s[i..])))?;
- if ratio_left == 0 && ratio_right == 0 {
+ if ratio_left == 0 || ratio_right == 0 {
return Err(DslError::Parse(
- "vote ratio 0:0 is invalid; use 1:1 for a tie or omit the vote".to_string(),
+ "vote ratio sides must be ≥ 1; use 1:1 for a tie or omit the vote".to_string(),
+ ));
+ }
+ if ratio_left > 100 || ratio_right > 100 {
+ return Err(DslError::Parse(
+ "vote ratio sides must be ≤ 100".to_string(),
));
}
i = skip_ws(s, k);
@@ -929,11 +934,50 @@ mod tests {
let err = parse_full("{tie placeholder}\n~/a 0:0 ~/b").unwrap_err();
let DslError::Parse(msg) = err;
assert!(
- msg.contains("0:0"),
- "expected 0:0 rejection message, got: {msg}"
+ msg.contains("≥ 1"),
+ "expected zero-side rejection message, got: {msg}"
);
}
+ #[test]
+ fn parse_vote_rejects_left_zero_ratio() {
+ let err = parse_full("{prefer b}\n~/a 0:5 ~/b").unwrap_err();
+ let DslError::Parse(msg) = err;
+ assert!(
+ msg.contains("≥ 1"),
+ "expected zero-side rejection message, got: {msg}"
+ );
+ }
+
+ #[test]
+ fn parse_vote_rejects_right_zero_ratio() {
+ let err = parse_full("{prefer a}\n~/a 5:0 ~/b").unwrap_err();
+ let DslError::Parse(msg) = err;
+ assert!(
+ msg.contains("≥ 1"),
+ "expected zero-side rejection message, got: {msg}"
+ );
+ }
+
+ #[test]
+ fn parse_vote_rejects_over_max_ratio() {
+ let err = parse_full("{prefer a strongly}\n~/a 101:1 ~/b").unwrap_err();
+ let DslError::Parse(msg) = err;
+ assert!(
+ msg.contains("≤ 100"),
+ "expected max ratio rejection message, got: {msg}"
+ );
+ }
+
+ #[test]
+ fn parse_vote_accepts_max_ratio() {
+ let doc = parse_full("{prefer a}\n~/a 100:1 ~/b").unwrap();
+ assert!(matches!(
+ doc.statements.last(),
+ Some(Stmt::Vote { ratio_left: 100, ratio_right: 1, .. })
+ ));
+ }
+
#[test]
fn parse_full_interleaves_prose() {
let input = "hello\n#tag\nworld";
diff --git a/server/src/reducer.rs b/server/src/reducer.rs
index e949e8e092297eedd5c20c131f16ef0121f329b3..6841d35cfc9de2389f340a22b8a45acb335e36c3 100644
--- a/server/src/reducer.rs
+++ b/server/src/reducer.rs
@@ -119,11 +119,11 @@ impl GroupState {
let (i, j) = if a_idx < b_idx { (a_idx, b_idx) } else { (b_idx, a_idx) };
self.voted_pairs.insert((i, j));
- let mut w_a = vote.ratio_left.max(0) as f64;
- let mut w_b = vote.ratio_right.max(0) as f64;
- if w_a == 0.0 && w_b == 0.0 {
- w_a = 1.0;
- w_b = 1.0;
+ let w_a = vote.ratio_left as f64;
+ let w_b = vote.ratio_right as f64;
+ if w_a == 0.0 || w_b == 0.0 {
+ // Zero on either side produces no valid edge; drop the vote.
+ return;
}
self.add_edge_weight(b_idx, a_idx, w_a);
diff --git a/server/tests/basic.rs b/server/tests/basic.rs
index 9d83e7a97e2c7494790db17c4b5b30c181705026..cc8c1a0d139f3722ba6ecd13dd001c65be835b67 100644
--- a/server/tests/basic.rs
+++ b/server/tests/basic.rs
@@ -175,14 +175,14 @@ fn reducer_clamps_score_bounds() {
let mut state = ReducerState::default();
state.apply_event(ingest_event(
1,
- "@00000000-0000-0000-0000-000000000000:test:local/test\n~/t/a {a}\n~/t/b {b}\n{huge}\n~/t/a 1000:1 ~/t/b\n",
+ "@00000000-0000-0000-0000-000000000000:test:local/test\n~/t/a {a}\n~/t/b {b}\n{huge}\n~/t/a 100:1 ~/t/b\n",
));
state.apply_event(ingest_event(
2,
- "@00000000-0000-0000-0000-000000000000:test:local/test\n{huge}\n~/t/a 1:1000 ~/t/b\n",
+ "@00000000-0000-0000-0000-000000000000:test:local/test\n{huge}\n~/t/a 1:100 ~/t/b\n",
));
- assert_eq!(state.public().ranking_group.idx_to_item.len(), 2); // Should still work, scores clamped internally
+ assert_eq!(state.public().ranking_group.idx_to_item.len(), 2); // Should still work, scores handled internally
}
// ============================================================================
@@ -513,8 +513,8 @@ fn dsl_parse_rejects_zero_zero_vote_ratio() {
.expect_err("0:0 vote must be rejected by the parser");
let slugsocial_server::dsl::DslError::Parse(msg) = err;
assert!(
- msg.contains("0:0"),
- "expected message about invalid 0:0 ratio, got: {msg}"
+ msg.contains("≥ 1"),
+ "expected message about invalid zero ratio, got: {msg}"
);
let mut state = ReducerState::default();
@@ -533,7 +533,7 @@ fn dsl_parse_rejects_zero_zero_vote_ratio() {
#[test]
fn reducer_negative_ratio_clamped_to_zero() {
let _state = ReducerState::default();
- // GroupState::apply_vote clamps negatives to 0, then 0:0 -> 1:1
+ // GroupState::apply_vote clamps negatives to 0; when either side is 0 the vote is dropped.
let mut group = GroupState::new();
group.apply_vote(slugsocial_server::reducer::VoteData {
ts: 1,
@@ -546,12 +546,12 @@ fn reducer_negative_ratio_clamped_to_zero() {
delegate: Some("00000000-0000-0000-0000-000000000000:test:local/test".to_string()),
thread_tag: "t".to_string(),
});
+ // Items are registered, but the zero-clamped vote produces no edges.
assert_eq!(group.idx_to_item.len(), 2);
- // Both edges should exist (negatives clamped to 0, then 0:0 -> 1:1)
let a_idx = group.item_to_idx[&item_id("https://slug.social/~/t/a")];
let b_idx = group.item_to_idx[&item_id("https://slug.social/~/t/b")];
- assert!(group.edges.contains_key(&(a_idx, b_idx)));
- assert!(group.edges.contains_key(&(b_idx, a_idx)));
+ assert!(!group.edges.contains_key(&(a_idx, b_idx)));
+ assert!(!group.edges.contains_key(&(b_idx, a_idx)));
}
diff --git a/server/tests/integration_ui.rs b/server/tests/integration_ui.rs
index 23db7b5672418d5bb0ab7529e05ef1f89e59062a..09c5481f039d59efb617a82bafcc432a186e2d30 100644
--- a/server/tests/integration_ui.rs
+++ b/server/tests/integration_ui.rs
@@ -256,3 +256,96 @@ async fn test_sse_public_thread_morph_includes_post_body_not_thread_not_found()
);
}
+fn ui_vote_compare_post_rpc(
+ room: &str,
+ thread_tag: &str,
+ left: &str,
+ right: &str,
+ ratio_left: &str,
+ ratio_right: &str,
+ explanation: &str,
+) -> String {
+ serde_json::json!({
+ "action": "vote_compare_post",
+ "room": room,
+ "thread_tag": thread_tag,
+ "left_item": left,
+ "right_item": right,
+ "ratio_left": ratio_left,
+ "ratio_right": ratio_right,
+ "explanation": explanation,
+ "next": "/vote",
+ })
+ .to_string()
+}
+
+#[tokio::test]
+async fn test_vote_compare_post_rejects_zero_left_ratio() {
+ let (addr, _tmp, _log, _handle) = create_test_server().await;
+ let client = reqwest::Client::new();
+ let bearer = test_bearer();
+
+ let rpc = ui_vote_compare_post_rpc("public", "test-vote", "~/a", "~/b", "0", "5", "prefer b");
+ let resp = client
+ .post(format!("http://{addr}/ui"))
+ .header("Authorization", format!("Bearer {bearer}"))
+ .form(&[("__rpc__", rpc.as_str())])
+ .send()
+ .await
+ .unwrap();
+
+ assert_eq!(resp.status(), reqwest::StatusCode::OK);
+ let js = resp.text().await.unwrap();
+ assert!(
+ js.contains("invalid ratio") || js.contains("≥ 1"),
+ "expected zero-ratio rejection, got: {js}"
+ );
+}
+
+#[tokio::test]
+async fn test_vote_compare_post_rejects_zero_right_ratio() {
+ let (addr, _tmp, _log, _handle) = create_test_server().await;
+ let client = reqwest::Client::new();
+ let bearer = test_bearer();
+
+ let rpc = ui_vote_compare_post_rpc("public", "test-vote", "~/a", "~/b", "5", "0", "prefer a");
+ let resp = client
+ .post(format!("http://{addr}/ui"))
+ .header("Authorization", format!("Bearer {bearer}"))
+ .form(&[("__rpc__", rpc.as_str())])
+ .send()
+ .await
+ .unwrap();
+
+ assert_eq!(resp.status(), reqwest::StatusCode::OK);
+ let js = resp.text().await.unwrap();
+ assert!(
+ js.contains("invalid ratio") || js.contains("≥ 1"),
+ "expected zero-ratio rejection, got: {js}"
+ );
+}
+
+#[tokio::test]
+async fn test_vote_compare_post_rejects_over_max_ratio() {
+ let (addr, _tmp, _log, _handle) = create_test_server().await;
+ let client = reqwest::Client::new();
+ let bearer = test_bearer();
+
+ let rpc =
+ ui_vote_compare_post_rpc("public", "test-vote", "~/a", "~/b", "101", "1", "prefer a");
+ let resp = client
+ .post(format!("http://{addr}/ui"))
+ .header("Authorization", format!("Bearer {bearer}"))
+ .form(&[("__rpc__", rpc.as_str())])
+ .send()
+ .await
+ .unwrap();
+
+ assert_eq!(resp.status(), reqwest::StatusCode::OK);
+ let js = resp.text().await.unwrap();
+ assert!(
+ js.contains("invalid ratio") || js.contains("≤ 100"),
+ "expected over-max ratio rejection, got: {js}"
+ );
+}
+
diff --git a/test/browser_vote_pool.clj b/test/browser_vote_pool.clj
index 23d0bd80b02bd8b1b48853454bed02793296550e..738608801027d1e662660b5d6c830b4ccd07c434 100644
--- a/test/browser_vote_pool.clj
+++ b/test/browser_vote_pool.clj
@@ -38,8 +38,8 @@
;; Set the hidden ratio inputs so the alphabetically-earlier item wins.
(defn- set-ratio! [pg left-text right-text]
(let [[rl rr] (if (neg? (compare (leaf left-text) (leaf right-text)))
- [100 0] ; left is earlier → prefer left
- [0 100])] ; right is earlier → prefer right
+ [99 1] ; left is earlier → prefer left
+ [1 99])] ; right is earlier → prefer right
(page/evaluate pg (str "document.getElementById('vote-ratio-left').value='" rl "'"))
(page/evaluate pg (str "document.getElementById('vote-ratio-right').value='" rr "'"))))
B — c_abd68b5e771a (tommy-mor)
message
[81de487b] Fix zero-ratio guard in reducer to drop before registering items or pair. Previously the early-return for zero-weight votes happened after ensure_item and voted_pairs.insert, leaving ghost items in the index and the pair incorrectly marked as voted. Move the check to before any side effects. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
diff preview
diff --git a/server/src/reducer.rs b/server/src/reducer.rs
index 6841d35cfc9de2389f340a22b8a45acb335e36c3..0e36979abe0f051493038ff7e652efc7f7a0ac80 100644
--- a/server/src/reducer.rs
+++ b/server/src/reducer.rs
@@ -112,6 +112,10 @@ impl GroupState {
if vote.ratio_right < 0 {
vote.ratio_right = 0;
}
+ if vote.ratio_left == 0 || vote.ratio_right == 0 {
+ // Zero on either side produces no valid edge; drop before registering items or pair.
+ return;
+ }
let a_idx = self.ensure_item(&vote.a);
let b_idx = self.ensure_item(&vote.b);
@@ -121,10 +125,6 @@ impl GroupState {
let w_a = vote.ratio_left as f64;
let w_b = vote.ratio_right as f64;
- if w_a == 0.0 || w_b == 0.0 {
- // Zero on either side produces no valid edge; drop the vote.
- return;
- }
self.add_edge_weight(b_idx, a_idx, w_a);
self.add_edge_weight(a_idx, b_idx, w_b);
diff --git a/server/tests/basic.rs b/server/tests/basic.rs
index cc8c1a0d139f3722ba6ecd13dd001c65be835b67..08159f4a7f0850fd165817a4a1af4f31ced2ad76 100644
--- a/server/tests/basic.rs
+++ b/server/tests/basic.rs
@@ -546,12 +546,10 @@ fn reducer_negative_ratio_clamped_to_zero() {
delegate: Some("00000000-0000-0000-0000-000000000000:test:local/test".to_string()),
thread_tag: "t".to_string(),
});
- // Items are registered, but the zero-clamped vote produces no edges.
- assert_eq!(group.idx_to_item.len(), 2);
- let a_idx = group.item_to_idx[&item_id("https://slug.social/~/t/a")];
- let b_idx = group.item_to_idx[&item_id("https://slug.social/~/t/b")];
- assert!(!group.edges.contains_key(&(a_idx, b_idx)));
- assert!(!group.edges.contains_key(&(b_idx, a_idx)));
+ // Nothing registered: zero-clamped vote is dropped before ensure_item.
+ assert!(group.idx_to_item.is_empty());
+ assert!(group.edges.is_empty());
+ assert!(group.voted_pairs.is_empty());
}
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