mcp: part 2

crates/brk_interface/src/pagination.rs

@@ -0,0 +1,31 @@
+use schemars::JsonSchema;
+use serde::Deserialize;
+
+use crate::Index;
+
+#[derive(Debug, Default, Deserialize, JsonSchema)]
+pub struct PaginationParam {
+    #[serde(alias = "p")]
+    #[schemars(description = "Pagination index")]
+    #[serde(default)]
+    pub page: usize,
+}
+
+impl PaginationParam {
+    const PER_PAGE: usize = 1_000;
+
+    pub fn start(&self, len: usize) -> usize {
+        (self.page * Self::PER_PAGE).clamp(0, len)
+    }
+
+    pub fn end(&self, len: usize) -> usize {
+        ((self.page + 1) * Self::PER_PAGE).clamp(0, len)
+    }
+}
+
+#[derive(Debug, Deserialize, JsonSchema)]
+pub struct PaginatedIndexParam {
+    pub index: Index,
+    #[serde(flatten)]
+    pub pagination: PaginationParam,
+}