feat: use pgvecto.rs (#3605)

server/src/infra/infra.utils.ts

@@ -0,0 +1,42 @@
+import { Paginated, PaginationOptions } from '@app/domain';
+import { Between, FindOneOptions, LessThanOrEqual, MoreThanOrEqual, ObjectLiteral, Repository } from 'typeorm';
+
+/**
+ * Allows optional values unlike the regular Between and uses MoreThanOrEqual
+ * or LessThanOrEqual when only one parameter is specified.
+ */
+export function OptionalBetween<T>(from?: T, to?: T) {
+  if (from && to) {
+    return Between(from, to);
+  } else if (from) {
+    return MoreThanOrEqual(from);
+  } else if (to) {
+    return LessThanOrEqual(to);
+  }
+}
+
+export async function paginate<Entity extends ObjectLiteral>(
+  repository: Repository<Entity>,
+  paginationOptions: PaginationOptions,
+  searchOptions?: FindOneOptions<Entity>,
+): Paginated<Entity> {
+  const items = await repository.find({
+    ...searchOptions,
+    // Take one more item to check if there's a next page
+    take: paginationOptions.take + 1,
+    skip: paginationOptions.skip,
+  });
+
+  const hasNextPage = items.length > paginationOptions.take;
+  items.splice(paginationOptions.take);
+
+  return { items, hasNextPage };
+}
+
+export const asVector = (embedding: number[], quote = false) =>
+  quote ? `'[${embedding.join(',')}]'` : `[${embedding.join(',')}]`;
+
+export const isValidInteger = (value: number, options: { min?: number; max?: number }): value is number => {
+  const { min = Number.MIN_SAFE_INTEGER, max = Number.MAX_SAFE_INTEGER } = options;
+  return Number.isInteger(value) && value >= min && value <= max;
+};