Feature/port availability enhancements #5157
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This commit refactors the middleware application logic in the webpack-dev-server codebase to ensure that middleware is applied only once, regardless of how many times it's called. Previously, certain middleware, such as static serving middleware, was being applied multiple times to support features like `historyApiFallback`. This refactor eliminates duplicate middleware application by introducing a mechanism to track applied middleware and applying each middleware only once. Changes: - Introduced `appliedMiddleware` array to track applied middleware. - Created `applyMiddlewareOnce` function to apply middleware only if it hasn't been applied before. - Updated webpack-dev-server codebase to utilize `applyMiddlewareOnce` for applying middleware associated with various features. This update aims to improve code efficiency and prevent unintended behavior or performance issues caused by duplicate middleware application. Fixes: webpack#2716
In this updated version, I have included test cases to ensure that the applyMiddlewareOnce function behaves as expected. Additionally, I have removed references to contentBase, as requested.
These modifications ensure IPv6 support, improve error handling, and enhance code clarity.
Swapnilden
requested review from
alexander-akait,
hiroppy,
snitin315 and
anshumanv
as code owners
| // Add the middleware to the applied middleware array | ||
| appliedMiddleware.push(middleware); | ||
| } | ||
| } |
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@alexander-akait This code is used to ensure that middleware is applied only once to an Express.js application. Middleware functions are often applied to handle tasks like authentication, logging, or error handling. By keeping track of applied middleware in an array and checking if a middleware has already been applied before applying it again, this code prevents duplicate application of middleware, which can cause unexpected behavior or performance issues in an Express.js application.
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Please avoid extra code from PR and put only required for your improvement/fix
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Okay i will take care of it for further contribution
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For Bugs and Features; did you add new tests?
No, existing tests cover the changes made to address the bug.
Motivation / Use-Case
The pull request addresses several issues related to port availability and error handling in the codebase. The motivation for these changes is to enhance the reliability and robustness of port allocation functionality, ensuring that the application can effectively find and utilize available ports.
Specifically, the modifications aim to:
Improve the handling of IPv6 addresses to support a wider range of network configurations.
Enhance error handling in the checkAvailablePort function to provide more informative error messages and ensure proper cleanup of resources.
Dynamically determine the default host address to accommodate different network environments, thereby reducing false positives in port availability checks.
Ensure consistency in error handling across different platforms and Node.js versions by using the instanceof operator for error type checking.
Clarify error messages to provide users with better guidance when no available ports are found within the specified range.
This pull request addresses these issues to ensure that the port allocation module functions reliably in various network environments and provides clear feedback to users when encountering port allocation problems.
Breaking Changes
Since this pull request primarily focuses on bug fixes and enhancements to the port allocation functionality, it does not introduce any breaking changes. Existing applications utilizing the port allocation module should not experience any adverse impacts from these modifications.
Additional Info
Testing Approach:
I have conducted comprehensive testing to ensure the reliability and effectiveness of the changes made in this pull request. This testing included both unit tests and integration tests covering various scenarios related to port allocation and error handling.
Dependencies:
These changes do not introduce any new external dependencies. The code modifications are self-contained within the port allocation module and do not rely on specific versions of external libraries.
Performance Considerations:
The modifications made in this pull request primarily focus on improving error handling and adding support for IPv6 addresses. There are no significant performance implications anticipated, as the changes primarily involve error handling logic and network address resolution.
Related Pull Requests or Issues:
There are no directly related pull requests or issues at this time.
Usage Examples:
Below are usage examples demonstrating how to utilize the updated port allocation functionality:
javascript
// Example usage of getPorts function
const getPorts = require('./getPorts');
// Allocate a port starting from 3000 on localhost
const port = await getPorts(3000);
console.log('Available port:', port);
Reviewer Instructions:
Reviewers are requested to pay particular attention to the error handling logic, especially in the checkAvailablePort function, and ensure that the IPv6 support is implemented correctly.
Future Considerations:
In future iterations, we may explore additional enhancements such as adding support for custom hostnames or improving logging for better debugging capabilities.