firefox/toolkit/modules/tests/xpcshell/test_Log.js

/* Any copyright is dedicated to the Public Domain.
   http://creativecommons.org/publicdomain/zero/1.0/ */

const { Log } = ChromeUtils.importESModule(
  "resource://gre/modules/Log.sys.mjs"
);

Services.prefs.setBoolPref("security.allow_eval_with_system_principal", true);
registerCleanupFunction(() => {
  Services.prefs.clearUserPref("security.allow_eval_with_system_principal");
});

class MockAppender extends Log.Appender {
  constructor(formatter) {
    super(formatter);
    this.messages = [];
  }

  doAppend(message) {
    this.messages.push(message);
  }
}

add_task(function test_Logger() {
  let log = Log.repository.getLogger("test.logger");
  let appender = new MockAppender(new Log.BasicFormatter());

  log.level = Log.Level.Debug;
  appender.level = Log.Level.Info;
  log.addAppender(appender);
  log.info("info test");
  log.debug("this should be logged but not appended.");

  Assert.equal(appender.messages.length, 1);

  let msgRe = /\d+\ttest.logger\t\INFO\tinfo test/;
  Assert.ok(msgRe.test(appender.messages[0]));
});

add_task(function test_Logger_parent() {
  // Check whether parenting is correct
  let grandparentLog = Log.repository.getLogger("grandparent");
  let childLog = Log.repository.getLogger("grandparent.parent.child");
  Assert.equal(childLog.parent.name, "grandparent");

  Log.repository.getLogger("grandparent.parent");
  Assert.equal(childLog.parent.name, "grandparent.parent");

  // Check that appends are exactly in scope
  let gpAppender = new MockAppender(new Log.BasicFormatter());
  gpAppender.level = Log.Level.Info;
  grandparentLog.addAppender(gpAppender);
  childLog.info("child info test");
  Log.repository.rootLogger.info("this shouldn't show up in gpAppender");

  Assert.equal(gpAppender.messages.length, 1);
  Assert.ok(gpAppender.messages[0].indexOf("child info test") > 0);
});

/*
 * Test parameter formatting.
 */
add_task(async function log_message_with_params() {
  let formatter = new Log.BasicFormatter();

  function formatMessage(text, params) {
    let full = formatter.format(
      new Log.LogMessage("test.logger", Log.Level.Warn, text, params)
    );
    return full.split("\t")[3];
  }

  // Strings are substituted directly.
  Assert.equal(
    formatMessage("String is ${foo}", { foo: "bar" }),
    "String is bar"
  );

  // Numbers are substituted.
  Assert.equal(
    formatMessage("Number is ${number}", { number: 47 }),
    "Number is 47"
  );

  // The entire params object is JSON-formatted and substituted.
  Assert.equal(
    formatMessage("Object is ${}", { foo: "bar" }),
    'Object is {"foo":"bar"}'
  );

  // An object nested inside params is JSON-formatted and substituted.
  Assert.equal(
    formatMessage("Sub object is ${sub}", { sub: { foo: "bar" } }),
    'Sub object is {"foo":"bar"}'
  );

  // The substitution field is missing from params. Leave the placeholder behind
  // to make the mistake obvious.
  Assert.equal(
    formatMessage("Missing object is ${missing}", {}),
    "Missing object is ${missing}"
  );

  // Make sure we don't treat the parameter name 'false' as a falsey value.
  Assert.equal(
    formatMessage("False is ${false}", { false: true }),
    "False is true"
  );

  // If an object has a .toJSON method, the formatter uses it.
  let ob = function () {};
  ob.toJSON = function () {
    return { sneaky: "value" };
  };
  Assert.equal(
    formatMessage("JSON is ${sub}", { sub: ob }),
    'JSON is {"sneaky":"value"}'
  );

  // Fall back to .toSource() if JSON.stringify() fails on an object.
  ob = function () {};
  ob.toJSON = function () {
    throw new Error("oh noes JSON");
  };
  Assert.equal(
    formatMessage("Fail is ${sub}", { sub: ob }),
    "Fail is (function () {})"
  );

  // Fall back to .toString if both .toJSON and .toSource fail.
  ob.toSource = function () {
    throw new Error("oh noes SOURCE");
  };
  Assert.equal(
    formatMessage("Fail is ${sub}", { sub: ob }),
    "Fail is function () {}"
  );

  // Fall back to '[object]' if .toJSON, .toSource and .toString fail.
  ob.toString = function () {
    throw new Error("oh noes STRING");
  };
  Assert.equal(
    formatMessage("Fail is ${sub}", { sub: ob }),
    "Fail is [object]"
  );

  // If params are passed but there are no substitution in the text
  // we JSON format and append the entire parameters object.
  Assert.equal(
    formatMessage("Text with no subs", { a: "b", c: "d" }),
    'Text with no subs: {"a":"b","c":"d"}'
  );

  // If we substitute one parameter but not the other,
  // we ignore any params that aren't substituted.
  Assert.equal(
    formatMessage("Text with partial sub ${a}", { a: "b", c: "d" }),
    "Text with partial sub b"
  );

  // We don't format internal fields stored in params.
  Assert.equal(
    formatMessage("Params with _ ${}", {
      a: "b",
      _c: "d",
      _level: 20,
      _message: "froo",
      _time: 123456,
      _namespace: "here.there",
    }),
    'Params with _ {"a":"b","_c":"d"}'
  );

  // Don't print an empty params holder if all params are internal.
  Assert.equal(
    formatMessage("All params internal", {
      _level: 20,
      _message: "froo",
      _time: 123456,
      _namespace: "here.there",
    }),
    "All params internal"
  );

  // Format params with null and undefined values.
  Assert.equal(
    formatMessage("Null ${n} undefined ${u}", { n: null, u: undefined }),
    "Null null undefined undefined"
  );

  // Format params with number, bool, and String type.
  Assert.equal(
    formatMessage("number ${n} boolean ${b} boxed Boolean ${bx} String ${s}", {
      n: 45,
      b: false,
      bx: Boolean(true),
      s: String("whatevs"),
    }),
    "number 45 boolean false boxed Boolean true String whatevs"
  );

  // Format params with consecutive tokens.
  Assert.equal(
    formatMessage("${a}${b}${c}", { a: "foo", b: "bar", c: "baz" }),
    "foobarbaz"
  );

  /*
   * Check that errors get special formatting if they're formatted directly as
   * a named param or they're the only param, but not if they're a field in a
   * larger structure.
   */
  let err = Components.Exception("test exception", Cr.NS_ERROR_FAILURE);
  let str = formatMessage("Exception is ${}", err);
  Assert.ok(str.includes('Exception is [Exception... "test exception"'));
  Assert.ok(str.includes("(NS_ERROR_FAILURE)"));
  str = formatMessage("Exception is", err);
  Assert.ok(str.includes('Exception is: [Exception... "test exception"'));
  str = formatMessage("Exception is ${error}", { error: err });
  Assert.ok(str.includes('Exception is [Exception... "test exception"'));
  str = formatMessage("Exception is", { _error: err });
  info(str);
  // Exceptions buried inside objects are formatted badly.
  Assert.ok(str.includes('Exception is: {"_error":{}'));
  // If the message text is null, the message contains only the formatted params object.
  str = formatMessage(null, err);
  Assert.ok(str.startsWith('[Exception... "test exception"'));
  // If the text is null and 'params' is a string, the message is exactly that string.
  str = formatMessage(null, "String in place of params");
  Assert.equal(str, "String in place of params");

  // We use object.valueOf() internally; make sure a broken valueOf() method
  // doesn't cause the logger to fail.
  /* eslint-disable object-shorthand */
  let vOf = {
    a: 1,
    valueOf: function () {
      throw new Error("oh noes valueOf");
    },
  };
  Assert.equal(
    formatMessage("Broken valueOf ${}", vOf),
    'Broken valueOf ({a:1, valueOf:(function () {\n      throw new Error("oh noes valueOf");\n    })})'
  );
  /* eslint-enable object-shorthand */

  // Test edge cases of bad data to formatter:
  // If 'params' is not an object, format it as a basic type.
  Assert.equal(
    formatMessage("non-object no subst", 1),
    "non-object no subst: 1"
  );
  Assert.equal(
    formatMessage("non-object all subst ${}", 2),
    "non-object all subst 2"
  );
  Assert.equal(formatMessage("false no subst", false), "false no subst: false");
  Assert.equal(formatMessage("null no subst", null), "null no subst: null");
  // If 'params' is undefined and there are no substitutions expected,
  // the message should still be output.
  Assert.equal(
    formatMessage("undefined no subst", undefined),
    "undefined no subst"
  );
  // If 'params' is not an object, no named substitutions can succeed;
  // therefore we leave the placeholder and append the formatted params.
  Assert.equal(
    formatMessage("non-object named subst ${junk} space", 3),
    "non-object named subst ${junk} space: 3"
  );
  // If there are no params, we leave behind the placeholders in the text.
  Assert.equal(
    formatMessage("no params ${missing}", undefined),
    "no params ${missing}"
  );
  // If params doesn't contain any of the tags requested in the text,
  // we leave them all behind and append the formatted params.
  Assert.equal(
    formatMessage("object missing tag ${missing} space", {
      mising: "not here",
    }),
    'object missing tag ${missing} space: {"mising":"not here"}'
  );
  // If we are given null text and no params, the resulting formatted message is empty.
  Assert.equal(formatMessage(null), "");
});

/*
 * If we call a log function with a non-string object in place of the text
 * argument, and no parameters, treat that the same as logging empty text
 * with the object argument as parameters. This makes the log useful when the
 * caller does "catch(err) {logger.error(err)}"
 */
add_task(async function test_log_err_only() {
  let log = Log.repository.getLogger("error.only");
  let mockFormatter = { format: msg => msg };
  let appender = new MockAppender(mockFormatter);
  log.addAppender(appender);

  /*
   * Check that log.error(err) is treated the same as
   * log.error(null, err) by the logMessage constructor; the formatMessage()
   * tests above ensure that the combination of null text and an error object
   * is formatted correctly.
   */
  try {
    // eslint-disable-next-line no-eval
    eval("javascript syntax error");
  } catch (e) {
    log.error(e);
    let msg = appender.messages.pop();
    Assert.equal(msg.message, null);
    Assert.equal(msg.params, e);
  }
});

/*
 * Test that all the basic logger methods pass the message and params through to the appender.
 */
add_task(async function log_message_with_params() {
  let log = Log.repository.getLogger("error.logger");
  let mockFormatter = { format: msg => msg };
  let appender = new MockAppender(mockFormatter);
  log.addAppender(appender);

  let testParams = { a: 1, b: 2 };
  log.fatal("Test fatal", testParams);
  log.error("Test error", testParams);
  log.warn("Test warn", testParams);
  log.info("Test info", testParams);
  log.config("Test config", testParams);
  log.debug("Test debug", testParams);
  log.trace("Test trace", testParams);
  Assert.equal(appender.messages.length, 7);
  for (let msg of appender.messages) {
    Assert.ok(msg.params === testParams);
    Assert.ok(msg.message.startsWith("Test "));
  }
});

/*
 * Test that all the basic logger methods support tagged template literal format.
 */
add_task(async function log_template_literal_message() {
  let log = Log.repository.getLogger("error.logger");
  let appender = new MockAppender(new Log.BasicFormatter());
  log.addAppender(appender);

  log.fatal`Test ${"foo"} ${42}`;
  log.error`Test ${"foo"} 42`;
  log.warn`Test foo 42`;
  log.info`Test ${"foo " + 42}`;
  log.config`${"Test"} foo ${42}`;
  log.debug`Test ${"f"}${"o"}${"o"} 42`;
  log.trace`${"Test foo 42"}`;
  Assert.equal(appender.messages.length, 7);
  for (let msg of appender.messages) {
    Assert.equal(msg.split("\t")[3], "Test foo 42");
  }
});

/*
 * Check that we format JS Errors reasonably.
 */
add_task(async function format_errors() {
  let pFormat = new Log.ParameterFormatter();

  // Test that subclasses of Error are recognized as errors.
  let err = new ReferenceError("Ref Error", "ERROR_FILE", 28);
  let str = pFormat.format(err);
  Assert.ok(str.includes("ReferenceError"));
  Assert.ok(str.includes("ERROR_FILE:28"));
  Assert.ok(str.includes("Ref Error"));

  // Test that JS-generated Errors are recognized and formatted.
  try {
    await Promise.resolve(); // Scrambles the stack
    // eslint-disable-next-line no-eval
    eval("javascript syntax error");
  } catch (e) {
    str = pFormat.format(e);
    Assert.ok(str.includes("SyntaxError: unexpected token"));
    // Make sure we identified it as an Error and formatted the error location as
    // lineNumber:columnNumber.
    Assert.ok(str.includes(":1:12)"));
    // Make sure that we use human-readable stack traces
    Assert.ok(str.includes("format_errors"));
  }
});

/*
 * Check that automatic support for setting the log level via preferences
 * works.
 */
add_test(function test_prefs() {
  let log = Log.repository.getLogger("error.logger");
  log.level = Log.Level.Debug;
  Services.prefs.setStringPref("logger.test", "Error");
  log.manageLevelFromPref("logger.test");
  // check initial pref value is set up.
  equal(log.level, Log.Level.Error);
  Services.prefs.setStringPref("logger.test", "Error");
  // check changing the pref causes the level to change.
  Services.prefs.setStringPref("logger.test", "Trace");
  equal(log.level, Log.Level.Trace);
  // invalid values cause nothing to happen.
  Services.prefs.setStringPref("logger.test", "invalid-level-value");
  equal(log.level, Log.Level.Trace);
  Services.prefs.setIntPref("logger.test", 123);
  equal(log.level, Log.Level.Trace);
  // setting a "sub preference" shouldn't impact it.
  Services.prefs.setStringPref("logger.test.foo", "Debug");
  equal(log.level, Log.Level.Trace);
  // clearing the level param should cause it to use the parent level.
  Log.repository.getLogger("error").level = Log.Level.All;
  Services.prefs.setStringPref("logger.test", "");
  equal(log.level, Log.Level.All);

  run_next_test();
});