Logging: tolerate EIO console writes

src/logging/console-capture.test.ts

@@ -0,0 +1,85 @@
+import crypto from "node:crypto";
+import os from "node:os";
+import path from "node:path";
+
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import {
+  enableConsoleCapture,
+  resetLogger,
+  routeLogsToStderr,
+  setLoggerOverride,
+} from "../logging.js";
+import { loggingState } from "./state.js";
+
+type ConsoleSnapshot = {
+  log: typeof console.log;
+  info: typeof console.info;
+  warn: typeof console.warn;
+  error: typeof console.error;
+  debug: typeof console.debug;
+  trace: typeof console.trace;
+};
+
+let snapshot: ConsoleSnapshot;
+
+beforeEach(() => {
+  snapshot = {
+    log: console.log,
+    info: console.info,
+    warn: console.warn,
+    error: console.error,
+    debug: console.debug,
+    trace: console.trace,
+  };
+  loggingState.consolePatched = false;
+  loggingState.forceConsoleToStderr = false;
+  loggingState.rawConsole = null;
+  resetLogger();
+});
+
+afterEach(() => {
+  console.log = snapshot.log;
+  console.info = snapshot.info;
+  console.warn = snapshot.warn;
+  console.error = snapshot.error;
+  console.debug = snapshot.debug;
+  console.trace = snapshot.trace;
+  loggingState.consolePatched = false;
+  loggingState.forceConsoleToStderr = false;
+  loggingState.rawConsole = null;
+  resetLogger();
+  setLoggerOverride(null);
+  vi.restoreAllMocks();
+});
+
+describe("enableConsoleCapture", () => {
+  it("swallows EIO from stderr writes", () => {
+    setLoggerOverride({ level: "info", file: tempLogPath() });
+    vi.spyOn(process.stderr, "write").mockImplementation(() => {
+      throw eioError();
+    });
+    routeLogsToStderr();
+    enableConsoleCapture();
+    expect(() => console.log("hello")).not.toThrow();
+  });
+
+  it("swallows EIO from original console writes", () => {
+    setLoggerOverride({ level: "info", file: tempLogPath() });
+    console.log = () => {
+      throw eioError();
+    };
+    enableConsoleCapture();
+    expect(() => console.log("hello")).not.toThrow();
+  });
+});
+
+function tempLogPath() {
+  return path.join(os.tmpdir(), `clawdbot-log-${crypto.randomUUID()}.log`);
+}
+
+function eioError() {
+  const err = new Error("EIO") as NodeJS.ErrnoException;
+  err.code = "EIO";
+  return err;
+}