487 lines
18 KiB
TypeScript
487 lines
18 KiB
TypeScript
import { existsSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
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import { tmpdir } from "node:os";
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import { join } from "node:path";
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import type { AgentMessage } from "@mariozechner/pi-agent-core";
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import { afterEach, describe, expect, it } from "vitest";
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import { JsonlSessionRepo } from "../../src/harness/session/jsonl-session-repo.js";
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import { JsonlSessionStorage, loadJsonlSessionMetadata } from "../../src/harness/session/jsonl-session-storage.js";
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import { InMemorySessionRepo } from "../../src/harness/session/memory-session-repo.js";
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import { InMemorySessionStorage } from "../../src/harness/session/memory-session-storage.js";
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import { DefaultSession } from "../../src/harness/session/session-tree.js";
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import type { MessageEntry, SessionMetadata, SessionStorage } from "../../src/harness/types.js";
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function createUserMessage(text: string): AgentMessage {
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return {
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role: "user",
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content: [{ type: "text", text }],
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timestamp: Date.now(),
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};
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}
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function createAssistantMessage(text: string): AgentMessage {
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return {
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role: "assistant",
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content: [{ type: "text", text }],
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api: "anthropic-messages",
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provider: "anthropic",
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model: "claude-sonnet-4-5",
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usage: {
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input: 0,
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output: 0,
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cacheRead: 0,
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cacheWrite: 0,
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totalTokens: 0,
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cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0, total: 0 },
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},
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stopReason: "stop",
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timestamp: Date.now(),
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};
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}
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const tempDirs: string[] = [];
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function createTempDir(): string {
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const dir = join(tmpdir(), `pi-agent-session-tree-${Date.now()}-${Math.random().toString(36).slice(2)}`);
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mkdirSync(dir, { recursive: true });
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tempDirs.push(dir);
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return dir;
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}
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afterEach(() => {
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while (tempDirs.length > 0) {
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const dir = tempDirs.pop()!;
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if (existsSync(dir)) {
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rmSync(dir, { recursive: true, force: true });
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}
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}
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});
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async function runSessionTreeSuite(
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name: string,
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createStorage: () => SessionStorage | Promise<SessionStorage>,
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inspect?: () => void,
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) {
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describe(name, () => {
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it("appends messages and builds context in order", async () => {
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const tree = new DefaultSession(await createStorage());
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await tree.appendMessage(createUserMessage("one"));
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await tree.appendMessage(createAssistantMessage("two"));
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const context = await tree.buildContext();
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expect(context.messages.map((message) => message.role)).toEqual(["user", "assistant"]);
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});
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it("tracks model and thinking level changes", async () => {
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const tree = new DefaultSession(await createStorage());
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await tree.appendMessage(createUserMessage("one"));
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await tree.appendModelChange("openai", "gpt-4.1");
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await tree.appendThinkingLevelChange("high");
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const context = await tree.buildContext();
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expect(context.thinkingLevel).toBe("high");
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expect(context.model).toEqual({ provider: "openai", modelId: "gpt-4.1" });
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});
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it("supports branching by moving the leaf and appending a new branch", async () => {
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const tree = new DefaultSession(await createStorage());
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const user1 = await tree.appendMessage(createUserMessage("one"));
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const assistant1 = await tree.appendMessage(createAssistantMessage("two"));
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await tree.appendMessage(createUserMessage("three"));
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await tree.moveTo(user1);
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await tree.appendMessage(createAssistantMessage("branched"));
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const branch = await tree.getBranch();
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expect(branch.map((entry) => entry.id)).toContain(user1);
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expect(branch.map((entry) => entry.id)).not.toContain(assistant1);
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const context = await tree.buildContext();
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expect(context.messages.map((message) => message.role)).toEqual(["user", "assistant"]);
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});
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it("supports moving the leaf to root", async () => {
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const tree = new DefaultSession(await createStorage());
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await tree.appendMessage(createUserMessage("one"));
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await tree.moveTo(null);
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expect(await tree.getLeafId()).toBeNull();
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expect((await tree.buildContext()).messages).toEqual([]);
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});
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it("reconstructs compaction summaries in context", async () => {
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const tree = new DefaultSession(await createStorage());
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await tree.appendMessage(createUserMessage("one"));
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await tree.appendMessage(createAssistantMessage("two"));
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const user2 = await tree.appendMessage(createUserMessage("three"));
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await tree.appendMessage(createAssistantMessage("four"));
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await tree.appendCompaction("summary", user2, 1234);
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await tree.appendMessage(createUserMessage("five"));
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const context = await tree.buildContext();
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expect(context.messages[0]?.role).toBe("compactionSummary");
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expect(context.messages).toHaveLength(4);
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});
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it("supports moving with branch summary entries in context", async () => {
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const tree = new DefaultSession(await createStorage());
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const user1 = await tree.appendMessage(createUserMessage("one"));
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const summaryId = await tree.moveTo(user1, { summary: "summary text" });
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expect(summaryId).toBeTruthy();
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const summaryEntry = await tree.getEntry(summaryId!);
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expect(summaryEntry).toMatchObject({ type: "branch_summary", parentId: user1, fromId: user1 });
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const context = await tree.buildContext();
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expect(context.messages[1]?.role).toBe("branchSummary");
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});
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it("supports custom message entries in context", async () => {
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const tree = new DefaultSession(await createStorage());
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await tree.appendMessage(createUserMessage("one"));
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await tree.appendCustomMessageEntry("custom", "hello", true, { ok: true });
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const context = await tree.buildContext();
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expect(context.messages[1]?.role).toBe("custom");
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});
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it("supports labels and session info entries without affecting context", async () => {
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const tree = new DefaultSession(await createStorage());
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const user1 = await tree.appendMessage(createUserMessage("one"));
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await tree.appendLabel(user1, "checkpoint");
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await tree.appendSessionName("name");
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const entries = await tree.getEntries();
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expect(entries.some((entry) => entry.type === "label")).toBe(true);
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expect(entries.some((entry) => entry.type === "session_info")).toBe(true);
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expect(await tree.getLabel(user1)).toBe("checkpoint");
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expect(await tree.getSessionName()).toBe("name");
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expect((await tree.buildContext()).messages).toHaveLength(1);
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});
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it("rejects labels for missing entries", async () => {
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const tree = new DefaultSession(await createStorage());
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await expect(tree.appendLabel("missing", "checkpoint")).rejects.toThrow("Entry missing not found");
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});
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it("persists leaf changes and appended entries via storage", async () => {
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const storage = await createStorage();
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const tree = new DefaultSession(storage);
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const user1 = await tree.appendMessage(createUserMessage("one"));
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await tree.appendMessage(createAssistantMessage("two"));
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await tree.appendLabel(user1, "checkpoint");
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await tree.appendSessionName("name");
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await tree.moveTo(user1);
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await tree.appendMessage(createAssistantMessage("branched"));
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const tree2 = new DefaultSession(storage);
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const context = await tree2.buildContext();
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expect(context.messages.map((message) => message.role)).toEqual(["user", "assistant"]);
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expect(await tree2.getLabel(user1)).toBe("checkpoint");
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expect(await tree2.getSessionName()).toBe("name");
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inspect?.();
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});
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});
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}
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describe("InMemorySessionStorage", () => {
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it("returns configured session info", async () => {
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const metadata: SessionMetadata = { id: "session-1", createdAt: "2026-01-01T00:00:00.000Z" };
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const storage = new InMemorySessionStorage({ metadata });
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expect(await storage.getMetadata()).toEqual(metadata);
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});
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it("copies initial entries and tracks leaf independently", async () => {
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const entry: MessageEntry = {
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type: "message",
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id: "entry-1",
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parentId: null,
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timestamp: "2026-01-01T00:00:00.000Z",
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message: createUserMessage("one"),
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};
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const initialEntries = [entry];
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const storage = new InMemorySessionStorage({ entries: initialEntries });
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initialEntries.push({ ...entry, id: "entry-2" });
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expect((await storage.getEntries()).map((storedEntry) => storedEntry.id)).toEqual(["entry-1"]);
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expect(await storage.getLeafId()).toBe("entry-1");
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await storage.setLeafId(null);
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expect(await storage.getLeafId()).toBeNull();
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});
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it("rejects invalid leaf ids", async () => {
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const storage = new InMemorySessionStorage();
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await expect(storage.setLeafId("missing")).rejects.toThrow("Entry missing not found");
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expect(() => new InMemorySessionStorage({ leafId: "missing" })).toThrow("Entry missing not found");
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});
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it("maintains label lookup", async () => {
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const entry: MessageEntry = {
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type: "message",
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id: "entry-1",
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parentId: null,
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timestamp: "2026-01-01T00:00:00.000Z",
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message: createUserMessage("one"),
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};
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const storage = new InMemorySessionStorage({ entries: [entry] });
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expect(await storage.getLabel("entry-1")).toBeUndefined();
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await storage.appendEntry({
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type: "label",
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id: "label-1",
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parentId: "entry-1",
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timestamp: "2026-01-01T00:00:01.000Z",
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targetId: "entry-1",
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label: "checkpoint",
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});
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expect(await storage.getLabel("entry-1")).toBe("checkpoint");
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await storage.appendEntry({
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type: "label",
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id: "label-2",
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parentId: "label-1",
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timestamp: "2026-01-01T00:00:02.000Z",
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targetId: "entry-1",
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label: undefined,
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});
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expect(await storage.getLabel("entry-1")).toBeUndefined();
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});
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it("walks paths to root", async () => {
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const root: MessageEntry = {
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type: "message",
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id: "root",
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parentId: null,
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timestamp: "2026-01-01T00:00:00.000Z",
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message: createUserMessage("root"),
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};
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const child: MessageEntry = {
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...root,
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id: "child",
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parentId: "root",
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message: createAssistantMessage("child"),
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};
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const storage = new InMemorySessionStorage({ entries: [root, child] });
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expect((await storage.getPathToRoot("child")).map((entry) => entry.id)).toEqual(["root", "child"]);
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expect(await storage.getPathToRoot(null)).toEqual([]);
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});
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});
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runSessionTreeSuite("Session with in-memory storage", () => new InMemorySessionStorage());
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describe("InMemorySessionRepo", () => {
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it("lists session infos and forks via storage path traversal", async () => {
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const repo = new InMemorySessionRepo();
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const session = await repo.create({ id: "session-1" });
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const user1 = await session.appendMessage(createUserMessage("one"));
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const assistant1 = await session.appendMessage(createAssistantMessage("two"));
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const user2 = await session.appendMessage(createUserMessage("three"));
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const infos = await repo.list();
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expect(infos.map((info) => info.id)).toEqual(["session-1"]);
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const fork = await repo.fork("session-1", { entryId: user2, id: "session-2" });
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expect((await fork.getEntries()).map((entry) => entry.id)).toEqual([user1, assistant1]);
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});
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});
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describe("JsonlSessionRepo", () => {
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it("stores sessions below encoded cwd directories and resolves prefixes", async () => {
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const root = createTempDir();
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const cwd = "/tmp/my-project";
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const repo = new JsonlSessionRepo({ sessionsRoot: root });
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const session = await repo.create({ cwd, id: "019de8c2-de29-73e9-ae0c-e134db34c447" });
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const info = await session.getMetadata();
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expect(info.path).toContain("--tmp-my-project--");
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expect(existsSync(info.path)).toBe(true);
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expect((await repo.list({ cwd })).map((sessionInfo) => sessionInfo.id)).toEqual([info.id]);
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expect((await repo.resolve("019de8c2", { cwd })).map((sessionInfo) => sessionInfo.path)).toEqual([info.path]);
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});
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it("forks sessions and records the parent path", async () => {
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const root = createTempDir();
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const repo = new JsonlSessionRepo({ sessionsRoot: root });
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const source = await repo.create({ cwd: "/tmp/source", id: "source-session" });
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const sourceInfo = await source.getMetadata();
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const user1 = await source.appendMessage(createUserMessage("one"));
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const assistant1 = await source.appendMessage(createAssistantMessage("two"));
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const user2 = await source.appendMessage(createUserMessage("three"));
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const fork = await repo.fork(sourceInfo, { cwd: "/tmp/target", id: "fork-session", entryId: user2 });
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const forkInfo = await fork.getMetadata();
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expect(forkInfo.cwd).toBe("/tmp/target");
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expect(forkInfo.parentSessionPath).toBe(sourceInfo.path);
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expect((await fork.getEntries()).map((entry) => entry.id)).toEqual([user1, assistant1]);
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});
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});
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describe("JsonlSessionStorage", () => {
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it("throws for missing files when opening", async () => {
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const dir = createTempDir();
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const filePath = join(dir, "session.jsonl");
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await expect(JsonlSessionStorage.open(filePath)).rejects.toMatchObject({ code: "ENOENT" });
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});
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it("writes the header on create", async () => {
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const dir = createTempDir();
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const filePath = join(dir, "session.jsonl");
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const storage = await JsonlSessionStorage.create(filePath, { cwd: dir, sessionId: "session-1" });
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expect(existsSync(filePath)).toBe(true);
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expect(readFileSync(filePath, "utf8").trim().split("\n")).toHaveLength(1);
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expect(await storage.getLeafId()).toBeNull();
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expect(await storage.getEntries()).toEqual([]);
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await storage.appendEntry({
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type: "message",
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id: "user-1",
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parentId: null,
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timestamp: "2026-01-01T00:00:00.000Z",
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message: createUserMessage("one"),
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});
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expect(existsSync(filePath)).toBe(true);
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const lines = readFileSync(filePath, "utf8").trim().split("\n");
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expect(JSON.parse(lines[0]!).type).toBe("session");
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expect(JSON.parse(lines[1]!).id).toBe("user-1");
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expect(lines).toHaveLength(2);
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});
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it("throws for malformed session headers", async () => {
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const dir = createTempDir();
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const filePath = join(dir, "session.jsonl");
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writeFileSync(filePath, "not json\n");
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await expect(JsonlSessionStorage.open(filePath)).rejects.toThrow("first line is not a valid session header");
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});
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it("ignores malformed entry lines", async () => {
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const dir = createTempDir();
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const filePath = join(dir, "session.jsonl");
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const header = {
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type: "session",
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version: 3,
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id: "session-1",
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timestamp: "2026-01-01T00:00:00.000Z",
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cwd: dir,
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};
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const entry: MessageEntry = {
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type: "message",
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id: "entry-1",
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parentId: null,
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timestamp: "2026-01-01T00:00:00.000Z",
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message: createUserMessage("one"),
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};
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writeFileSync(filePath, `${JSON.stringify(header)}\nnot json\n${JSON.stringify(entry)}\n`);
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const storage = await JsonlSessionStorage.open(filePath);
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expect((await storage.getEntries()).map((loadedEntry) => loadedEntry.id)).toEqual(["entry-1"]);
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expect(await storage.getLeafId()).toBe("entry-1");
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});
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it("creates and reads session info from the header", async () => {
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const dir = createTempDir();
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const filePath = join(dir, "session.jsonl");
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const storage = await JsonlSessionStorage.create(filePath, {
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cwd: dir,
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sessionId: "session-1",
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parentSessionPath: "/tmp/parent.jsonl",
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});
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const info = await storage.getMetadata();
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expect(info).toMatchObject({
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id: "session-1",
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cwd: dir,
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path: filePath,
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parentSessionPath: "/tmp/parent.jsonl",
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});
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expect(existsSync(filePath)).toBe(true);
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await storage.appendEntry({
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type: "message",
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id: "user-1",
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parentId: null,
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timestamp: "2026-01-01T00:00:00.000Z",
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message: createUserMessage("one"),
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});
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expect(await loadJsonlSessionMetadata(filePath)).toEqual(info);
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});
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it("loads existing entries and reconstructs leaf", async () => {
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const dir = createTempDir();
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const filePath = join(dir, "session.jsonl");
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const storage = await JsonlSessionStorage.create(filePath, { cwd: dir, sessionId: "session-1" });
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const root: MessageEntry = {
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type: "message",
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id: "root",
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parentId: null,
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timestamp: "2026-01-01T00:00:00.000Z",
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message: createUserMessage("root"),
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};
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const child: MessageEntry = {
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...root,
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id: "child",
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parentId: "root",
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message: createAssistantMessage("child"),
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};
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await storage.appendEntry(root);
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await storage.appendEntry(child);
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const loaded = await JsonlSessionStorage.open(filePath);
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expect(await loaded.getLeafId()).toBe("child");
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expect((await loaded.getEntries()).map((entry) => entry.id)).toEqual(["root", "child"]);
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expect((await loaded.getPathToRoot("child")).map((entry) => entry.id)).toEqual(["root", "child"]);
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});
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it("maintains label lookup", async () => {
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const dir = createTempDir();
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const filePath = join(dir, "session.jsonl");
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const storage = await JsonlSessionStorage.create(filePath, { cwd: dir, sessionId: "session-1" });
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await storage.appendEntry({
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type: "message",
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id: "entry-1",
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parentId: null,
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timestamp: "2026-01-01T00:00:00.000Z",
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message: createUserMessage("one"),
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});
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expect(await storage.getLabel("entry-1")).toBeUndefined();
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await storage.appendEntry({
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type: "label",
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id: "label-1",
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parentId: "entry-1",
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timestamp: "2026-01-01T00:00:01.000Z",
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targetId: "entry-1",
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label: "checkpoint",
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});
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expect(await storage.getLabel("entry-1")).toBe("checkpoint");
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await storage.appendEntry({
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type: "label",
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id: "label-2",
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parentId: "label-1",
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timestamp: "2026-01-01T00:00:02.000Z",
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targetId: "entry-1",
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label: undefined,
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});
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expect(await storage.getLabel("entry-1")).toBeUndefined();
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const loaded = await JsonlSessionStorage.open(filePath);
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expect(await loaded.getLabel("entry-1")).toBeUndefined();
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});
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it("reads session info from only the first JSONL line", async () => {
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const dir = createTempDir();
|
|
const filePath = join(dir, "session.jsonl");
|
|
const header = {
|
|
type: "session",
|
|
version: 3,
|
|
id: "session-1",
|
|
timestamp: "2026-01-01T00:00:00.000Z",
|
|
cwd: dir,
|
|
};
|
|
const malformedSecondLine = "{".repeat(10000);
|
|
writeFileSync(filePath, `${JSON.stringify(header)}\n${malformedSecondLine}\n`);
|
|
expect(await loadJsonlSessionMetadata(filePath)).toEqual({
|
|
id: "session-1",
|
|
createdAt: "2026-01-01T00:00:00.000Z",
|
|
cwd: dir,
|
|
path: filePath,
|
|
parentSessionPath: undefined,
|
|
});
|
|
});
|
|
});
|
|
|
|
runSessionTreeSuite(
|
|
"Session with JSONL storage",
|
|
async () => {
|
|
const dir = createTempDir();
|
|
return await JsonlSessionStorage.create(join(dir, "session.jsonl"), { cwd: dir, sessionId: "session-1" });
|
|
},
|
|
() => {
|
|
const dir = tempDirs[tempDirs.length - 1]!;
|
|
const filePath = join(dir, "session.jsonl");
|
|
const lines = readFileSync(filePath, "utf8").trim().split("\n");
|
|
expect(lines.length).toBeGreaterThan(1);
|
|
const header = JSON.parse(lines[0]!);
|
|
expect(header.type).toBe("session");
|
|
expect(header.version).toBe(3);
|
|
for (const line of lines.slice(1)) {
|
|
const entry = JSON.parse(line);
|
|
expect(entry.type).not.toBe("entry");
|
|
expect(entry.type).not.toBe("leaf");
|
|
expect(typeof entry.id).toBe("string");
|
|
}
|
|
},
|
|
);
|