🚧 Work in progress for stellar coin module

libs/coin-modules/coin-stellar/src/api/index.test.ts

@@ -0,0 +1,116 @@
+import { createApi } from "./index";
+
+const mockGetOperations = jest.fn();
+
+jest.mock("../logic/listOperations", () => ({
+  listOperations: () => mockGetOperations(),
+}));
+
+const api = createApi({
+  explorer: {
+    url: "explorer.com",
+    fetchLimit: 200,
+  },
+  useStaticFees: true,
+  enableNetworkLogs: false,
+});
+
+describe("operations", () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it("should return 0 operations for a valid account", async () => {
+    mockGetOperations.mockResolvedValue([[], 0]);
+
+    // When
+    const operations = await api.listOperations("addr", { limit: 100 });
+
+    // Then
+    expect(operations).toEqual([[], 0]);
+    expect(mockGetOperations).toHaveBeenCalledTimes(1);
+  });
+
+  it("should return 1 operation for a valid account", async () => {
+    const mockOperation = {
+      hash: "e035a56c32003e3b0e4c9c5499b0750d71d98233ae6ae94323ff0a458b05a30b",
+      address: "addr",
+      type: "Operation",
+      value: 200,
+      fee: 0.0291,
+      block: {
+        hash: "hash",
+        time: new Date("2024-03-20T10:00:00Z"),
+        height: 10,
+      },
+      senders: ["addr"],
+      recipients: ["recipient"],
+      date: new Date("2024-03-20T10:00:00Z"),
+      transactionSequenceNumber: 2,
+    };
+    mockGetOperations.mockResolvedValue([[mockOperation], 0]);
+
+    // When
+    const operations = await api.listOperations("addr", { limit: 100, start: 9 });
+
+    // Then
+    expect(operations).toEqual([[mockOperation], 0]);
+    expect(mockGetOperations).toHaveBeenCalledTimes(1);
+  });
+
+  it("should return 0 operations if start is greater than the last operation", async () => {
+    const mockOperation = {
+      hash: "e035a56c32003e3b0e4c9c5499b0750d71d98233ae6ae94323ff0a458b05a30b",
+      address: "addr",
+      type: "Operation",
+      value: 200,
+      fee: 0.0291,
+      block: {
+        hash: "hash",
+        time: new Date("2024-03-20T10:00:00Z"),
+        height: 10,
+      },
+      senders: ["addr"],
+      recipients: ["recipient"],
+      date: new Date("2024-03-20T10:00:00Z"),
+      transactionSequenceNumber: 2,
+    };
+    mockGetOperations.mockResolvedValue([[mockOperation], 0]);
+
+    // When
+    const operations = await api.listOperations("addr", { start: 100, limit: 100 });
+
+    // Then
+    expect(operations).toEqual([[], 0]);
+  });
+
+  it("should call multiple times listOperations", async () => {
+    const mockOperation = {
+      hash: "e035a56c32003e3b0e4c9c5499b0750d71d98233ae6ae94323ff0a458b05a30b",
+      address: "addr",
+      type: "Operation",
+      value: 200,
+      fee: 0.0291,
+      block: {
+        hash: "hash",
+        time: new Date("2024-03-20T10:00:00Z"),
+        height: 10,
+      },
+      senders: ["addr"],
+      recipients: ["recipient"],
+      date: new Date("2024-03-20T10:00:00Z"),
+      transactionSequenceNumber: 2,
+    };
+
+    mockGetOperations
+      .mockResolvedValueOnce([[mockOperation], 10])
+      .mockResolvedValueOnce([[mockOperation], 0]);
+
+    // When
+    const operations = await api.listOperations("addr", { start: 9, limit: 100 });
+
+    // Then
+    expect(operations).toEqual([[mockOperation, mockOperation], 0]);
+    expect(mockGetOperations).toHaveBeenCalledTimes(2);
+  });
+});

libs/coin-modules/coin-stellar/src/api/index.ts

@@ -67,7 +67,44 @@ function compose(tx: string, signature: string, pubkey?: string): string {
   return combine(tx, signature, pubkey);
 }
 
-const operations = async (
+async function operations(
   address: string,
   { limit, start }: Pagination,
-): Promise<[Operation[], number]> => listOperations(address, { limit, cursor: start });
+): Promise<[Operation[], number]> {
+  return start || start === 0
+    ? operationsFromHeight(address, start)
+    : listOperations(address, { limit });
+}
+
+type PaginationState = {
+  pageSize: number;
+  heightLimit: number;
+  continueIterations: boolean;
+  apiNextCursor?: number;
+  accumulator: Operation[];
+};
+
+async function operationsFromHeight(
+  address: string,
+  start: number,
+): Promise<[Operation[], number]> {
+  const state: PaginationState = {
+    pageSize: 100,
+    heightLimit: start,
+    continueIterations: true,
+    accumulator: [],
+  };
+
+  while (state.continueIterations) {
+    const [operations, nextCursor] = await listOperations(address, {
+      limit: state.pageSize,
+      cursor: state.apiNextCursor,
+    });
+    const filteredOperations = operations.filter(op => op.block.height >= state.heightLimit);
+    state.accumulator.push(...filteredOperations);
+    state.apiNextCursor = nextCursor;
+    state.continueIterations = nextCursor !== 0;
+  }
+
+  return [state.accumulator, state.apiNextCursor ?? 0];
+}

libs/coin-modules/coin-stellar/src/logic/listOperations.ts

@@ -27,15 +27,14 @@ export async function listOperations(
   const operations = await fetchOperations({
     accountId,
     addr: address,
-    order: "asc",
+    order: "desc",
     limit,
     cursor: cursor?.toString(),
   });
+  const lastOperation = operations.slice(-1)[0];
+  const nextCursor = lastOperation?.extra?.pagingToken ?? "0";
 
-  return [
-    operations.map(convertToCoreOperation(address)),
-    parseInt(operations.slice(-1)[0].extra.pagingToken ?? "0"),
-  ];
+  return [operations.map(convertToCoreOperation(address)), parseInt(nextCursor)];
 }
 
 const convertToCoreOperation = (address: string) => (operation: StellarOperation) => {

libs/coin-modules/coin-stellar/src/network/horizon.ts

@@ -269,7 +269,7 @@ export async function fetchOperations({
   accountId,
   addr,
   order,
-  cursor = "0",
+  cursor,
   limit,
 }: {
   accountId: string;
@@ -290,7 +290,7 @@ export async function fetchOperations({
       .forAccount(addr)
       .limit(limit ?? defaultFetchLimit)
       .order(order)
-      .cursor(cursor)
+      .cursor(cursor ?? "")
       .includeFailed(true)
       .join("transactions")
       .call();