example: add factory mode

examples/cli/indexers/3-starknet-factory.indexer.ts

@@ -0,0 +1,56 @@
+import { defineIndexer } from "@apibara/indexer";
+import { useLogger } from "@apibara/indexer/plugins/logger";
+import { StarknetStream } from "@apibara/starknet";
+import type { ApibaraRuntimeConfig } from "apibara/types";
+import { hash } from "starknet";
+
+const PAIR_CREATED = hash.getSelectorFromName("PairCreated") as `0x${string}`;
+const SWAP = hash.getSelectorFromName("Swap") as `0x${string}`;
+
+export default function (runtimeConfig: ApibaraRuntimeConfig) {
+  return defineIndexer(StarknetStream)({
+    streamUrl: "https://starknet.preview.apibara.org",
+    finality: "accepted",
+    startingCursor: {
+      orderKey: 800_000n,
+    },
+    filter: {
+      header: "always",
+      events: [
+        {
+          address:
+            "0x00dad44c139a476c7a17fc8141e6db680e9abc9f56fe249a105094c44382c2fd",
+          keys: [PAIR_CREATED],
+        },
+      ],
+    },
+    async factory({ block: { events } }) {
+      const logger = useLogger();
+
+      const poolEvents = (events ?? []).flatMap((event) => {
+        const pairAddress = event.data?.[2];
+
+        logger.log(`Factory: PairAddress - ${pairAddress}`);
+        return {
+          address: pairAddress,
+          keys: [SWAP],
+          includeReceipt: false,
+        };
+      });
+
+      logger.log("poolEvents", poolEvents);
+
+      return {
+        filter: {
+          header: "always",
+          events: poolEvents,
+        },
+      };
+    },
+    async transform({ block, endCursor }) {
+      const logger = useLogger();
+      logger.log("Transforming ", endCursor?.orderKey);
+      logger.log("Events ", block.events);
+    },
+  });
+}