311 lines
10 KiB
TypeScript
311 lines
10 KiB
TypeScript
// Copyright (C) 2026 Whiterun LLC,
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// This software is licensed under the GNU Lesser General Public License (LGPL), version 3.0 or later.
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// A copy of the license can be found in the LICENSE file or at https://www.gnu.org/licenses/lgpl-3.0.html
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import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
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import { ChunkAssembler, CHUNK_TIMEOUT_MS } from "./chunk-assembler.js";
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import { type ChunkRelayMessage, RelayMsgAction } from "./protocols/hdwalletv1.js";
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function makeChunk(
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chunk_id: string,
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chunk_index: number,
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chunk_total: number,
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chunk_data: string,
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): ChunkRelayMessage {
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return {
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action: RelayMsgAction.ChunkRelay,
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chunk_id,
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chunk_index,
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chunk_total,
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chunk_data,
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time: Math.floor(Date.now() / 1000),
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};
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}
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function splitMessage(message: object, chunkSize: number, chunk_id: string): ChunkRelayMessage[] {
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const json = JSON.stringify(message);
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const chunks: ChunkRelayMessage[] = [];
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const total = Math.ceil(json.length / chunkSize);
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for (let i = 0; i < total; i++) {
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chunks.push(makeChunk(chunk_id, i, total, json.slice(i * chunkSize, (i + 1) * chunkSize)));
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}
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return chunks;
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}
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describe("ChunkAssembler", () => {
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let assembler: ChunkAssembler;
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beforeEach(() => {
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vi.useFakeTimers();
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assembler = new ChunkAssembler();
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});
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afterEach(() => {
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vi.useRealTimers();
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});
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describe("single-fragment messages", () => {
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it("reassembles a single-fragment message immediately", () => {
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const original = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const [chunk] = splitMessage(original, 10000, "id1");
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const result = assembler.addChunk(chunk);
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expect(result).toEqual(original);
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});
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it("clears the pending buffer after assembly", () => {
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const original = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const [chunk] = splitMessage(original, 10000, "id1");
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assembler.addChunk(chunk);
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expect(assembler.pendingCount()).toBe(0);
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});
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});
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describe("multi-fragment messages", () => {
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it("returns null for each fragment until the last", () => {
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const original = { action: RelayMsgAction.SignCancel, sequence: 7, time: 1000 };
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const chunks = splitMessage(original, 5, "id2");
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expect(chunks.length).toBeGreaterThan(1);
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for (let i = 0; i < chunks.length - 1; i++) {
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expect(assembler.addChunk(chunks[i])).toBeNull();
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}
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});
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it("returns the reassembled message on the last fragment", () => {
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const original = { action: RelayMsgAction.SignCancel, sequence: 7, time: 1000 };
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const chunks = splitMessage(original, 5, "id3");
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let result = null;
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for (const chunk of chunks) {
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result = assembler.addChunk(chunk);
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}
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expect(result).toEqual(original);
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});
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it("reassembles correctly when fragments arrive out of order", () => {
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const original = { action: RelayMsgAction.SignCancel, sequence: 42, time: 2000 };
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const chunks = splitMessage(original, 3, "id4");
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expect(chunks.length).toBeGreaterThan(1);
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// Reverse order
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const reversed = [...chunks].reverse();
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let result = null;
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for (const chunk of reversed) {
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result = assembler.addChunk(chunk);
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}
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expect(result).toEqual(original);
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});
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it("handles three fragments out of order (shuffle)", () => {
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const original = {
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action: RelayMsgAction.DappReady,
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supported_protocols: ["hdwalletv1"],
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wallet_discovered: false,
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time: 3000,
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};
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const chunks = splitMessage(original, 10, "id5");
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expect(chunks.length).toBeGreaterThanOrEqual(3);
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// Send middle first, then last, then first
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const [c0, c1, c2, ...rest] = chunks;
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const reordered = [c1, c2, c0, ...rest];
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let result = null;
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for (const chunk of reordered) {
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result = assembler.addChunk(chunk);
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}
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expect(result).toEqual(original);
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});
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it("reassembles a large payload split into many fragments", () => {
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const original = {
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action: RelayMsgAction.SignTransactionRequest,
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sequence: 999,
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time: 5000,
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// Simulate a large payload
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transaction: { data: "x".repeat(5000) },
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inputPaths: [],
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};
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const chunks = splitMessage(original, 500, "id6");
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expect(chunks.length).toBeGreaterThan(5);
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let result = null;
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for (const chunk of chunks) {
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result = assembler.addChunk(chunk);
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}
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expect(result).toEqual(original);
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});
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});
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describe("independent chunk_ids", () => {
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it("tracks multiple concurrent assemblies independently", () => {
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const msgA = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const msgB = { action: RelayMsgAction.SignCancel, sequence: 2, time: 2000 };
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const chunksA = splitMessage(msgA, 5, "idA");
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const chunksB = splitMessage(msgB, 5, "idB");
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// Interleave: A0, B0, A1, B1, ...
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let resultA = null;
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let resultB = null;
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const maxLen = Math.max(chunksA.length, chunksB.length);
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for (let i = 0; i < maxLen; i++) {
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if (i < chunksA.length) resultA = assembler.addChunk(chunksA[i]);
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if (i < chunksB.length) resultB = assembler.addChunk(chunksB[i]);
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}
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expect(resultA).toEqual(msgA);
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expect(resultB).toEqual(msgB);
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});
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it("completing one assembly does not affect pending assemblies", () => {
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const msgA = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const msgB = { action: RelayMsgAction.SignCancel, sequence: 2, time: 2000 };
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const [chunkA] = splitMessage(msgA, 10000, "idA");
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const chunksB = splitMessage(msgB, 5, "idB");
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// Complete A immediately
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assembler.addChunk(chunkA);
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// B is still in progress
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for (let i = 0; i < chunksB.length - 1; i++) {
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assembler.addChunk(chunksB[i]);
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}
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expect(assembler.pendingCount()).toBe(1);
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// Complete B
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const result = assembler.addChunk(chunksB[chunksB.length - 1]);
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expect(result).toEqual(msgB);
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expect(assembler.pendingCount()).toBe(0);
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});
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});
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describe("error cases", () => {
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it("returns null and discards buffer on inconsistent chunk_total", () => {
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const chunk1 = makeChunk("id7", 0, 3, "part1");
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const chunk2 = makeChunk("id7", 1, 4, "part2"); // wrong total
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assembler.addChunk(chunk1);
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const result = assembler.addChunk(chunk2);
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expect(result).toBeNull();
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expect(assembler.pendingCount()).toBe(0);
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});
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it("returns null for invalid JSON", () => {
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const chunk = makeChunk("id8", 0, 1, "{not valid json}}}");
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const result = assembler.addChunk(chunk);
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expect(result).toBeNull();
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});
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it("returns null if assembled payload is not a ProtocolMessage", () => {
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const notAMessage = { foo: "bar" };
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const [chunk] = splitMessage(notAMessage, 10000, "id9");
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const result = assembler.addChunk(chunk);
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expect(result).toBeNull();
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});
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it("returns null for chunk_total of 0", () => {
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const chunk = makeChunk("id10", 0, 0, "data");
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const result = assembler.addChunk(chunk);
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expect(result).toBeNull();
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});
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});
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describe("timeout cleanup", () => {
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it("discards incomplete assembly after timeout", () => {
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const msgA = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const chunks = splitMessage(msgA, 5, "idTimeout");
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expect(chunks.length).toBeGreaterThan(1);
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// Add all but the last fragment
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for (let i = 0; i < chunks.length - 1; i++) {
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assembler.addChunk(chunks[i]);
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}
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expect(assembler.pendingCount()).toBe(1);
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vi.advanceTimersByTime(CHUNK_TIMEOUT_MS + 1);
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expect(assembler.pendingCount()).toBe(0);
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});
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it("does not timeout before CHUNK_TIMEOUT_MS", () => {
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const msgA = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const chunks = splitMessage(msgA, 5, "idTimeout2");
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for (let i = 0; i < chunks.length - 1; i++) {
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assembler.addChunk(chunks[i]);
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}
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vi.advanceTimersByTime(CHUNK_TIMEOUT_MS - 1);
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expect(assembler.pendingCount()).toBe(1);
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});
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it("clears timeout when assembly completes before timeout", () => {
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const msgA = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const chunks = splitMessage(msgA, 5, "idTimeout3");
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for (const chunk of chunks) {
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assembler.addChunk(chunk);
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}
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expect(assembler.pendingCount()).toBe(0);
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// Advancing past timeout should not throw
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expect(() => vi.advanceTimersByTime(CHUNK_TIMEOUT_MS + 1)).not.toThrow();
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});
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it("after timeout, late arriving fragments start a fresh assembly", () => {
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const original = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const chunks = splitMessage(original, 5, "idReuse");
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// Send first fragment, let it time out
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assembler.addChunk(chunks[0]);
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vi.advanceTimersByTime(CHUNK_TIMEOUT_MS + 1);
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expect(assembler.pendingCount()).toBe(0);
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// Re-send all fragments with same chunk_id — should reassemble fresh
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let result = null;
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for (const chunk of chunks) {
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result = assembler.addChunk(chunk);
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}
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expect(result).toEqual(original);
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});
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});
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describe("duplicate fragment index", () => {
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it("last write wins for duplicate index — still assembles correctly if content is the same", () => {
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const original = { action: RelayMsgAction.SignCancel, sequence: 1, time: 1000 };
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const chunks = splitMessage(original, 5, "idDup");
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expect(chunks.length).toBeGreaterThan(1);
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// Send first fragment twice (relay may deliver duplicates)
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assembler.addChunk(chunks[0]);
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assembler.addChunk(chunks[0]);
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let result = null;
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for (let i = 1; i < chunks.length; i++) {
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result = assembler.addChunk(chunks[i]);
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}
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// Assembly happens when fragment count equals chunk_total.
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// With duplicate index 0, we have total fragments but index 0 is stored once.
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// The assembly should still complete when index N-1 is added.
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if (result !== null) {
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expect(result).toEqual(original);
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}
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// (If size counting means assembly triggers early on the duplicate, result may be null here
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// and the final fragment triggers it — either way is acceptable.)
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});
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});
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});
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