refactor: harden log stream writes

src/cli/logs-cli.test.ts

@@ -0,0 +1,85 @@
+import { Command } from "commander";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+const callGatewayFromCli = vi.fn();
+
+vi.mock("./gateway-rpc.js", async () => {
+  const actual = await vi.importActual<typeof import("./gateway-rpc.js")>("./gateway-rpc.js");
+  return {
+    ...actual,
+    callGatewayFromCli: (...args: unknown[]) => callGatewayFromCli(...args),
+  };
+});
+
+describe("logs cli", () => {
+  afterEach(() => {
+    callGatewayFromCli.mockReset();
+  });
+
+  it("writes output directly to stdout/stderr", async () => {
+    callGatewayFromCli.mockResolvedValueOnce({
+      file: "/tmp/clawdbot.log",
+      cursor: 1,
+      size: 123,
+      lines: ["raw line"],
+      truncated: true,
+      reset: true,
+    });
+
+    const stdoutWrites: string[] = [];
+    const stderrWrites: string[] = [];
+    const stdoutSpy = vi.spyOn(process.stdout, "write").mockImplementation((chunk: unknown) => {
+      stdoutWrites.push(String(chunk));
+      return true;
+    });
+    const stderrSpy = vi.spyOn(process.stderr, "write").mockImplementation((chunk: unknown) => {
+      stderrWrites.push(String(chunk));
+      return true;
+    });
+
+    const { registerLogsCli } = await import("./logs-cli.js");
+    const program = new Command();
+    program.exitOverride();
+    registerLogsCli(program);
+
+    await program.parseAsync(["logs"], { from: "user" });
+
+    stdoutSpy.mockRestore();
+    stderrSpy.mockRestore();
+
+    expect(stdoutWrites.join("")).toContain("Log file:");
+    expect(stdoutWrites.join("")).toContain("raw line");
+    expect(stderrWrites.join("")).toContain("Log tail truncated");
+    expect(stderrWrites.join("")).toContain("Log cursor reset");
+  });
+
+  it("warns when the output pipe closes", async () => {
+    callGatewayFromCli.mockResolvedValueOnce({
+      file: "/tmp/clawdbot.log",
+      lines: ["line one"],
+    });
+
+    const stderrWrites: string[] = [];
+    const stdoutSpy = vi.spyOn(process.stdout, "write").mockImplementation(() => {
+      const err = new Error("EPIPE") as NodeJS.ErrnoException;
+      err.code = "EPIPE";
+      throw err;
+    });
+    const stderrSpy = vi.spyOn(process.stderr, "write").mockImplementation((chunk: unknown) => {
+      stderrWrites.push(String(chunk));
+      return true;
+    });
+
+    const { registerLogsCli } = await import("./logs-cli.js");
+    const program = new Command();
+    program.exitOverride();
+    registerLogsCli(program);
+
+    await program.parseAsync(["logs"], { from: "user" });
+
+    stdoutSpy.mockRestore();
+    stderrSpy.mockRestore();
+
+    expect(stderrWrites.join("")).toContain("output stdout closed");
+  });
+});