- Open the SonarQube web interface and navigate to your project.
- Go to the "Administration" section from the sidebar.
- In the "Quality Profiles" tab, select the profile you want to add custom rules to (e.g., "Sonar way"). If you don't have a custom profile, you can create one and activate it.
- Click on the "Create" button under "Rules" to create a new rule template.
- Specify the rule details such as name, description, type, severity, and tags.
- Under the "Parameters" tab, configure the parameters for the rule if necessary. This step depends on the rule you selected.
- Save the custom rule template.
- Once the rule template is saved, it will appear in the "Quality Profiles" tab. Activate the rule by checking the box next to it.
- To analyze your code with the custom rules, run a new SonarQube analysis.
By setting up custom rules, you can define coding standards specific to your project and enforce them during code analysis. Custom rules in SonarQube enable you to expand the capabilities of the default rule sets and tailor them to your project's needs.
Code coverage is used to measure the extent to which the source code of a program is tested by a particular test suite. It helps in identifying areas of code that have not been tested, thereby allowing developers to improve test coverage and identify potential bugs or vulnerabilities.
- Rule effectiveness: Code coverage helps in determining how effective the custom rules are in identifying potential issues. By analyzing the coverage data, developers can identify areas of code that are not covered by tests and verify if the custom rules are detecting issues accurately.
- Quality improvement: Code coverage metrics can be used to identify areas of code with low or no coverage, implying potential gaps in testing. It can guide developers to focus on such areas and improve the quality and reliability of the codebase.
- Compliance: Code coverage can be used to enforce certain code quality standards or compliance requirements. By setting a minimum coverage threshold, organizations can ensure that the code meets a certain level of quality and reliability.
- Technical debt management: Code coverage metrics can provide insights into the overall health of the codebase. Low coverage areas indicate technical debt that needs to be addressed. By configuring custom rules to enforce coverage thresholds, developers can prevent the accumulation of technical debt over time.
- Log in to your SonarQube instance as an Administrator.
- Navigate to the administration page by clicking on the gear icon in the top right corner.
- In the left sidebar, click on the "Quality Profiles" option under the Quality Management section.
- In the profile settings page, click on the "Inactive" tab to view the inactive rules.
- Find the custom rule that you want to enable and click on the "Activate" button next to it. This will enable the rule for the selected quality profile.
- To disable a custom rule, navigate to the "Active" tab and click on the "Deactivate" button next to the rule you want to disable.
- Once you have activated or deactivated the desired rules, click on the "Save" button to apply the changes to the quality profile.
Note: Custom rules in SonarQube can be added by developing your own plugins or by using third-party plugins.
- False positives: Developing accurate custom rules can be difficult, and there is a risk of creating rules that generate false positives. False positives can undermine the trust and usefulness of SonarQube reports, leading to wasted time and effort investigating and suppressing them.
- Performance impact: Overly complex or inefficient custom rules can impact the performance of SonarQube. The execution and analysis time can increase, resulting in longer feedback cycles or slower analysis.
- Lack of community support: Custom rules are typically developed within a specific organization or team. This approach lacks the benefit of community support that comes with built-in rules available in SonarQube. Community rules are extensively tested, maintained, and improved over time by a wider user base.
- Learning curve: Using custom rules requires developers or teams to invest time in understanding the SonarQube plugin development ecosystem, language-specific rule development practices, and the SonarQube API. This learning curve may be challenging for teams new to SonarQube or lacking experience in plugin development.
Despite these limitations, custom rules can provide value by enforcing specific coding standards, detecting code smells, or ensuring adherence to team-specific practices. They can be particularly useful in situations where built-in rules do not cover specific requirements.
- Log in to your SonarQube instance as an administrator.
- Go to the "Quality Profiles" page by clicking on "Quality Profiles" in the sidebar.
- Find the profile that you want to configure custom rule violation notifications for, and click on its name.
- In the profile details view, click on the "Active Rules" tab.
- Use the search bar to find the custom rule that you want to set up notifications for. If the rule is not already activated, click on its name and then click on the "Activate" button.
- Once the rule is activated, click on the rule's name to open its configuration page.
- In the rule's configuration page, scroll down to the "Notifications" section.
- Under the "Send notifications when" drop-down menu, select the option that suits your needs. For example, you can choose to receive notifications when the rule has any new issues, or when the total number of issues exceeds a certain threshold.
- Specify the recipients for the notifications. You can choose to send notifications to individual users, groups, or email addresses.
- Click on the "Save" button to apply the changes.
- Avoid use of eval(): This rule prevents the use of the eval() function, which can introduce security vulnerabilities.
- Avoid using global variables: This rule ensures that global variables are not used, promoting better encapsulation and reducing the risk of name clashes.
- Prevent unused variables: This rule detects and reports variables that are declared but never used, helping to reduce unnecessary clutter in the codebase.
- Limit the number of function parameters: This rule encourages code readability and maintainability by setting a limit on the number of function parameters that can be defined.
- Require JSDoc comments for functions: This rule enforces the use of JSDoc comments for documenting function parameters, return values, and exceptions.
- Enforce consistent naming conventions: This rule ensures that variables, functions, and classes are named according to a specified naming convention, improving code clarity and consistency.
- Use design patterns: This rule encourages the use of specified design patterns, such as the Module Pattern or the Observer Pattern, to improve the maintainability and modularity of the code.
- Enforce coding style guidelines: This rule enforces coding style guidelines, such as indentation, line length, and the use of semicolons, to ensure consistency across the codebase.
- Package your custom rule as a SonarQube plugin, following the SonarQube plugin packaging guidelines. This usually involves creating a Maven or Gradle project and defining the necessary dependencies and configurations.
- Deploy the plugin to your SonarQube server. This can be done by copying the plugin JAR file to the extensions/plugins directory of your SonarQube installation.
- Configure the SonarQube project to use your custom rules. Once the plugin is deployed, you can navigate to the SonarQube project settings and enable or disable the custom rules as needed.