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Configuring source{d} Lookout

The behavior of source{d} Lookout is defined with two different configuration files:

  • config.yml, to define the global configuration of the server.
  • .lookout.yml, to override the analyzer default behavior in each repository.

config.yml

source{d} Lookout is configured with the config.yml file, you can use the template config.yml.tpl to create your own. Use the lookoutd option --config to set the path to it, or use the default location at ./config.yml. The config file is read on server startup, so lookoutd needs to be restarted in order to load a new configuration.

The most important things you need to configure for a local installation, are:

  1. Repositories: define the repositories to be watched.
  2. Analyzers: add the gRPC addresses of the analyzers to be used by source{d} Lookout.

The main structure of config.yml is:

providers:
    github:
        # configuration of GitHub provider
repositories:
    # list of repositories to watch and user/token if needed
analyzers:
    # list of named analyzers
timeout:
    # configuration for the existing timeouts.

For more fine grained configuration, you should pay attention to the following documentation.

Github Provider

The providers.github key configures how source{d} Lookout will connect with GitHub.

providers:
  github:
    comment_footer: "_Comment made by '{{.Name}}'{{with .Feedback}}, [tell us]({{.}}){{end}}._"
    # app_id: 1234
    # private_key: ./key.pem
    # installation_sync_interval: 1h
    # watch_min_interval: 2s

comment_footer key defines the go template that will be used for custom messages for every message posted on GitHub; see how to add a custom message to the posted comments

Authentication with GitHub

source{d} Lookout needs to authenticate with GitHub. There are two ways to authenticate with GitHub:

  • Using GitHub personal access tokens.
  • Authenticating as a GitHub App.

Both are explained below.

Authentication with GitHub personal access tokens

The easiest method for testing purposes is using a GitHub personal access token. The token should have the repo scope enabled.

The credentials can be passed to lookoutd:

  • globally for all watched repositories, using command line arguments or environment variables when running lookoutd:
    • user: --github-user argument or GITHUB_USER environment variable.
    • token: --github-token argument or GITHUB_TOKEN environment variable.
  • per watched repository, following the instructions given by the Repositories section of this docs.

Authentication as a GitHub App

For a production environment, you can use source{d} Lookout as a GitHub App.

To do so, you must also unset any environment variable or option for the GitHub username and token authentication.

You need to create a GitHub App following the documentation about creating a GitHub App. The permissions that must be set are:

  • Repository metadata: Read-only
  • Pull requests: Read & write
  • Repository contents: Read-only
  • Commit statuses: Read & write

Download a private key following the documentation about authenticating with GitHub Apps and set the following fields in your config.yml file:

providers:
  github:
    app_id: 1234
    private_key: ./key.pem
    installation_sync_interval: 1h
    watch_min_interval: 10s

Then you need to install the GitHub App in all your repositories or in a list of them.

When the GitHub App authentication method is used, the repositories to analyze are retrieved automatically from the GitHub installations, so repositories list from config.yml is ignored.

The update interval to discover new installations and repositories is defined by installation_sync_interval.

The minimum watch interval to discover new pull requests and push events is defined by watch_min_interval.

Web Interface

The source{d} Lookout Web Interface to manage the installations of your GitHub App is currently under development, but you can find more details about it and its configuration at Web Interface docs

Repositories

The list of repositories to be watched by source{d} Lookout is defined by:

  • the repositories field at config.yml, or
  • the repositories where the GitHub App is installed if you authenticated as a GitHub App. In that case, the repositories field in config.yml will be ignored.

The user and token to be used for the Github authentication can be defined per repository; if you do so, it will override the globally passed user and token.

repositories:
  - url: github.com/<user>/<repo1>
  - url: github.com/<user>/<repo2>
    client:
      # user: github-user
      # token: github-user-token
      # minInterval: 1m

Analyzers

Each analyzer to be requested by source{d} Lookout should be defined under analyzers key.

analyzers:
  - name: Example name # required, unique name of the analyzer
    addr: ipv4://localhost:9930 # required, gRPC address
    disabled: false # optional, false by default
    feedback: http://example.com/analyzer # url to link in the comment_footer
    settings: # optional, this field is sent to analyzer "as is"
        threshold: 0.8

feedback key contains the URL used in the custom footer added to any message posted on GitHub; see how to add a custom message to the posted comments

Add a Custom Message to the Posted Comments

You can configure source{d} Lookout to add a custom message to every comment that each analyzer returns. This custom message will be created from the template defined by providers.github.comment_footer, using the configuration set for each analyzer.

If the template (providers.github.comment_footer) is empty, or the analyzer configuration does not define any of the values that the template requires, the custom message won't be added.

For example, for this configuration, each analyzer needs to define name and settings.email:

providers:
  github:
    comment_footer: "Comment made by analyzer {{.Name}}, [email me]({{.Settings.email}})."

analyzers:
  - name: Fancy Analyzer
    addr: ipv4://localhost:9930
    settings:
      email: [email protected]
  - name: Awesome Analyzer
    addr: ipv4://localhost:9931

Comments from Fancy Analyzer will have this footer appended:

Comment made by analyzer Fancy Analyzer, email me.

but comments from Awesome Analyzer wont have a footer message because in its configuration it's missing the settings.email value.

Timeouts

The timeouts used by lookoutd for some operations can be modified or disabled from the config.yml file.

If any timeout is set to 0, there will be no timeout for that process.

Below is the list of different timeouts in source{d} Lookout, with their default values:

# These are the default timeout values. A value of 0 means no timeout
timeout:
  # Timeout for an analyzer to reply a NotifyReviewEvent
  analyzer_review: 10m
  # Timeout for an analyzer to reply a NotifyPushEvent
  analyzer_push: 60m
  # Timeout for HTTP requests to the GitHub API
  github_request: 1m
  # Timeout for Git fetch actions
  git_fetch: 20m
  # Timeout for Bblfsh to reply to a Parse request
  bblfsh_parse: 2m

.lookout.yml

It's possible to customize the Analyzers configuration for each repository. To do that you only need to place a .lookout.yml file at the root directory of that repository.

Example:

analyzers:
  - name: Example name
    disabled: true
    settings:
        threshold: 0.9
        mode: confident

The analyzer to configure must be identified with the same name in the .lookout.yml config file as in source{d} Lookout server configuration, otherwise, it will be ignored.

The repository can disable any analyzer, but it cannot define new analyzers nor enable those that are disabled in the source{d} Lookout server.

The settings for each analyzer in the .lookout.yml config file will be merged with the source{d} Lookout configuration following these rules:

  • Objects are deep merged
  • Arrays are replaced
  • Null value replaces object