sls-dev-tools/lib/services/awsCloudwatchLogs.js

The Dev Tools for the Serverless World

"use strict";

function getEventsFromStreams(logGroupName, logStreamNames, cloudwatchLogsAPI) {
  const params = {
    logGroupName,
    logStreamNames,
    limit: 50
  };
  return cloudwatchLogsAPI.filterLogEvents(params).promise().catch(err => {
    console.error(err);
  });
}

function getStreams(api, params) {
  return api.describeLogStreams(params).promise().catch(err => {
    console.error(err);
  });
}

async function getLogEvents(logGroupName, cloudwatchLogsAPI) {
  const params = {
    logGroupName,
    descending: true,
    limit: 5,
    orderBy: "LastEventTime"
  };
  const streams = await getStreams(cloudwatchLogsAPI, params);

  if (streams) {
    const streamNames = streams.logStreams.map(stream => stream.logStreamName);

    if (streamNames.length === 0) {
      return [];
    }

    const data = await getEventsFromStreams(logGroupName, streamNames, cloudwatchLogsAPI);
    return data.events;
  }

  return null;
}

module.exports = {
  getLogEvents
};