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    @meltwater/mlabs-logger

    8.0.0 • Public • Published

    Logger

    npm github docs Codecov CircleCI

    Standard logger for mlabs services.

    Description

    Logs structured JSON to stdout with Pino. Detects and optimizes for production or development mode. Integrates well with AVA tests.

    Installation

    Add this as a dependency to your project using npm with

    $ npm install @meltwater/mlabs-logger
    

    or using Yarn with

    $ yarn add @meltwater/mlabs-logger
    

    Usage

    See the complete API documentation and working examples.

    Provides a Pino logger.

    import { createLogger } from '@meltwater/mlabs-logger'
    
    const log = createLogger({name: 'foo'})
    
    log.info({userId: '42'}, 'User: Create')
    log.error({err: new Error('On fire!')}, 'User Create: Fail')

    Use in AVA tests

    Simply pass t as an option to createLogger to send all log output to AVA's t.log method.

    Override the log level by setting the LOG_LEVEL environment variable. Override the log output mode by either passing outputMode or setting the LOG_OUTPUT_MODE environment variable. The mode may be any mode supported by bunyan-formatter: short (default), long, simple, json, or bunyan.

    For example, assuming Foo takes a logger,

    import test from 'ava'
    import { createLogger } from '@meltwater/mlabs-logger'
    
    import Foo from './foo'
    
    test('does bar', t => {
      const foo = new Foo({log: createLogger({t})})
      const bar = foo.bar()
      t.true(bar)
    })

    Development Quickstart

    $ git clone https://github.com/meltwater/mlabs-logger.git
    $ cd mlabs-logger
    $ nvm install
    $ yarn
    

    Run each command below in a separate terminal window:

    $ yarn run watch
    $ yarn run test:watch
    

    Development and Testing

    Source code

    The mlabs-logger source is hosted on GitHub. Clone the project with

    $ git clone git@github.com:meltwater/mlabs-logger.git
    

    Requirements

    You will need Node.js with npm, Yarn, and a Node.js debugging client.

    Be sure that all commands run under the correct Node version, e.g., if using nvm, install the correct version with

    $ nvm install
    

    Set the active version for each shell session with

    $ nvm use
    

    Install the development dependencies with

    $ yarn
    

    CircleCI

    CircleCI should already be configured: this section is for reference only.

    The following environment variables must be set on CircleCI:

    • NPM_TOKEN: npm token for installing and publishing packages.
    • NPM_TEAM: npm team to grant read-only package access (format org:team, optional).
    • CODECOV_TOKEN: Codecov token for uploading coverage reports (optional).

    These may be set manually or by running the script ./.circleci/envvars.sh.

    Development tasks

    Primary development tasks are defined under scripts in package.json and available via yarn run. View them with

    $ yarn run
    

    Production build

    Lint, test, and transpile the production build to dist with

    $ yarn run dist
    
    Publishing a new release

    Release a new version using npm version. This will run all tests, update the version number, create and push a tagged commit, and trigger CircleCI to publish the new version to npm.

    • Update the CHANGELOG before each new release after version 1.
    • New versions are released when the commit message is a valid version number.
    • Versions are only published on release branches: master branch or any branch matching ver/*.
    • If branch protection options are enabled, you must first run npm version on a separate branch, wait for the commit to pass any required checks, then merge and push the changes to a release branch.
    • Do not use the GitHub pull request button to merge version commits as the commit tagged with the new version number will not match after merging.

    Examples

    See the full documentation on using examples.

    View all examples with

    $ yarn run example
    

    Linting

    Linting against the JavaScript Standard Style and JSON Lint is handled by gulp.

    View available commands with

    $ yarn run gulp --tasks
    

    Run all linters with

    $ yarn run lint
    

    In a separate window, use gulp to watch for changes and lint JavaScript and JSON files with

    $ yarn run watch
    

    Automatically fix most JavaScript formatting errors with

    $ yarn run format
    

    Tests

    Unit and integration testing is handled by AVA and coverage is reported by Istanbul and uploaded to Codecov.

    • Test files end in .spec.js.
    • Unit tests are placed under lib alongside the tested module.
    • Integration tests are placed in test.
    • Static files used in tests are placed in fixtures.

    Watch and run tests on changes with

    $ yarn run test:watch
    

    If using AVA snapshot testing, update snapshots with

    $ yarn run test:update
    

    Generate a coverage report with

    $ yarn run report
    

    An HTML version will be saved in coverage.

    Debugging tests

    Create a breakpoint by adding the statement debugger to the test and start a debug session with, e.g.,

    $ yarn run test:inspect lib/logger.spec.js
    

    Watch and restart the debugging session on changes with

    $ yarn run test:inspect:watch lib/logger.spec.js
    

    Contributing

    The author and active contributors may be found in package.json,

    $ jq .author < package.json
    $ jq .contributors < package.json
    

    To submit a patch:

    1. Request repository access by submitting a new issue.
    2. Create your feature branch (git checkout -b my-new-feature).
    3. Make changes and write tests.
    4. Commit your changes (git commit -am 'Add some feature').
    5. Push to the branch (git push origin my-new-feature).
    6. Create a new Pull Request.

    License

    This npm package is licensed under the MIT license.

    Warranty

    This software is provided by the copyright holders and contributors "as is" and any express or implied warranties, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose are disclaimed. In no event shall the copyright holder or contributors be liable for any direct, indirect, incidental, special, exemplary, or consequential damages (including, but not limited to, procurement of substitute goods or services; loss of use, data, or profits; or business interruption) however caused and on any theory of liability, whether in contract, strict liability, or tort (including negligence or otherwise) arising in any way out of the use of this software, even if advised of the possibility of such damage.

    Install

    npm i @meltwater/mlabs-logger

    DownloadsWeekly Downloads

    226

    Version

    8.0.0

    License

    MIT

    Unpacked Size

    348 kB

    Total Files

    25

    Last publish

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