indexer: fix bound checks in getDrizzleCursor (#109)

Author: fracek

change/@apibara-indexer-2ad98856-798e-4946-8109-02388d49f0e4.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "indexer: fix conditions in getDrizzleCursor",
+  "packageName": "@apibara/indexer",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}

packages/indexer/src/sinks/drizzle/drizzle.test.ts

@@ -9,16 +9,13 @@ import { drizzle } from "drizzle-orm/node-postgres";
 import { serial, text } from "drizzle-orm/pg-core";
 import { Client } from "pg";
 import { beforeAll, beforeEach, describe, expect, it } from "vitest";
-import {
-  type Int8Range,
-  drizzle as drizzleSink,
-  getDrizzleCursor,
-  pgTable,
-} from ".";
 import { useSink } from "../../hooks";
 import { run } from "../../indexer";
 import { generateMockMessages } from "../../testing";
 import { getMockIndexer } from "../../testing/indexer";
+import type { Int8Range } from "./Int8Range";
+import { drizzle as drizzleSink } from "./drizzle";
+import { getDrizzleCursor, pgTable } from "./utils";
 
 const testTable = pgTable("test_table", {
   id: serial("id").primaryKey(),

packages/indexer/src/sinks/drizzle/utils.ts

@@ -83,10 +83,10 @@ export const getDrizzleCursor = (
   const isArray = Array.isArray(cursor_range);
   const [lower, upper] = isArray ? cursor_range : [cursor_range, undefined];
   let isNoUpperBound = false;
-  if (!lower) {
+  if (lower === undefined) {
     throw new Error("Lower bound cursor is required");
   }
-  if (!upper) {
+  if (upper === undefined) {
     isNoUpperBound = true;
   }
   return new Int8Range(