log4js-node/test/tap/dateFileAppender-test.js

const { test } = require("tap");
const path = require("path");
const fs = require("fs");
const EOL = require("os").EOL || "\n";
const format = require("date-format");
const sandbox = require("@log4js-node/sandboxed-module");
const log4js = require("../../lib/log4js");

function removeFile(filename) {
  try {
    fs.unlinkSync(path.join(__dirname, filename));
  } catch (e) {
    // doesn't matter
  }
}

test("../../lib/appenders/dateFile", batch => {
  batch.test("with default settings", t => {
    const testFile = path.join(__dirname, "date-appender-default.log");
    log4js.configure({
      appenders: { date: { type: "dateFile", filename: testFile } },
      categories: { default: { appenders: ["date"], level: "DEBUG" } }
    });

    const logger = log4js.getLogger("default-settings");

    logger.info("This should be in the file.");
    t.teardown(() => {
      removeFile("date-appender-default.log");
    });

    setTimeout(() => {
      fs.readFile(testFile, "utf8", (err, contents) => {
        t.match(contents, "This should be in the file");
        t.match(
          contents,
          /\[\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}] \[INFO] default-settings - /
        );
        t.end();
      });
    }, 100);
  });

  batch.test("configure with dateFileAppender", t => {
    log4js.configure({
      appenders: {
        date: {
          type: "dateFile",
          filename: "test/tap/date-file-test.log",
          pattern: "-yyyy-MM-dd",
          layout: { type: "messagePassThrough" }
        }
      },
      categories: { default: { appenders: ["date"], level: "WARN" } }
    });
    const logger = log4js.getLogger("tests");
    logger.info("this should not be written to the file");
    logger.warn("this should be written to the file");

    log4js.shutdown(() => {
      fs.readFile(
        path.join(__dirname, "date-file-test.log"),
        "utf8",
        (err, contents) => {
          t.match(contents, `this should be written to the file${EOL}`);
          t.equal(
            contents.indexOf("this should not be written to the file"),
            -1
          );
          t.end();
        }
      );
    });

    t.teardown(() => {
      removeFile("date-file-test.log");
    });
  });

  batch.test("configure with options.alwaysIncludePattern", t => {
    const options = {
      appenders: {
        date: {
          category: "tests",
          type: "dateFile",
          filename: "test/tap/date-file-test",
          pattern: "yyyy-MM-dd.log",
          alwaysIncludePattern: true,
          layout: {
            type: "messagePassThrough"
          }
        }
      },
      categories: { default: { appenders: ["date"], level: "debug" } }
    };

    const thisTime = format.asString(
      options.appenders.date.pattern,
      new Date()
    );
    const testFile = `date-file-test.${thisTime}`;
    const existingFile = path.join(
      __dirname,
      testFile
    );
    fs.writeFileSync(existingFile, `this is existing data${EOL}`, "utf8");
    log4js.configure(options);
    const logger = log4js.getLogger("tests");
    logger.warn("this should be written to the file with the appended date");

    t.teardown(() => {
      removeFile(testFile);
    });

    // wait for filesystem to catch up
    log4js.shutdown(() => {
      fs.readFile(existingFile, "utf8", (err, contents) => {
        t.match(
          contents,
          "this is existing data",
          "should not overwrite the file on open (issue #132)"
        );
        t.match(
          contents,
          "this should be written to the file with the appended date"
        );
        t.end();
      });
    });
  });

  batch.test("should flush logs on shutdown", t => {
    const testFile = path.join(__dirname, "date-appender-flush.log");
    log4js.configure({
      appenders: { test: { type: "dateFile", filename: testFile } },
      categories: { default: { appenders: ["test"], level: "trace" } }
    });
    const logger = log4js.getLogger("default-settings");

    logger.info("1");
    logger.info("2");
    logger.info("3");
    t.teardown(() => {
      removeFile("date-appender-flush.log");
    });

    log4js.shutdown(() => {
      fs.readFile(testFile, "utf8", (err, fileContents) => {
        // 3 lines of output, plus the trailing newline.
        t.equal(fileContents.split(EOL).length, 4);
        t.match(
          fileContents,
          /\[\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{3}] \[INFO] default-settings - /
        );
        t.end();
      });
    });
  });

  batch.test("should map maxLogSize to maxSize", t => {
    const fakeStreamroller = {};
    class DateRollingFileStream {
      constructor(filename, pattern, options) {
        fakeStreamroller.filename = filename;
        fakeStreamroller.pattern = pattern;
        fakeStreamroller.options = options;
      }

      on() { } // eslint-disable-line 
    }
    fakeStreamroller.DateRollingFileStream = DateRollingFileStream;
    const dateFileAppenderModule = sandbox.require(
      "../../lib/appenders/dateFile",
      {
        requires: { streamroller: fakeStreamroller }
      }
    );
    dateFileAppenderModule.configure(
      {
        filename: "cheese.log",
        pattern: "yyyy",
        maxLogSize: 100
      },
      { basicLayout: () => {} }
    );

    t.equal(fakeStreamroller.options.maxSize, 100);
    t.end();
  });

  batch.end();
});