fix: handle rate limits and resource leaks in Artifact Hub sync

[parthivsaikia]

Description

This PR addresses critical stability issues identified in the GetAllAhHelmPackages function during high-volume syncs with Artifact Hub.

Changes included:

1. Implemented Exponential Backoff: Replaced the static sleep duration with an exponential backoff strategy (1s, 2s, 4s...) to handle 429 Too Many Requests errors gracefully.
2. Fixed Resource Leak: Resolved a file descriptor exhaustion issue where defer resp.Body.Close() was placed inside a for loop (which only closes resources on function return). The response body is now closed explicitly after each iteration.
3. Updated Documentation: Updated the function comment to accurately reflect the new retry mechanism.

This PR fixes #855

Signed commits

• Yes, I signed my commits.

[gemini-code-assist]

Summary of Changes

Hello @parthivsaikia, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances the stability and reliability of the GetAllAhHelmPackages function, particularly during high-volume data synchronization with Artifact Hub. By introducing an exponential backoff mechanism, the system can now gracefully manage rate limits, preventing service interruptions. Additionally, a critical resource leak related to HTTP response bodies has been addressed, ensuring efficient resource utilization and preventing potential system crashes under heavy load.

Highlights

• Exponential Backoff: Implemented an exponential backoff strategy (1s, 2s, 4s...) to gracefully handle '429 Too Many Requests' errors when interacting with Artifact Hub, replacing a static sleep duration.
• Resource Leak Fix: Resolved a file descriptor exhaustion issue by explicitly closing the HTTP response body after each iteration within a loop, rather than relying on defer which would only close resources upon function return.
• Documentation Update: Updated the function comment for GetAllAhHelmPackages to accurately reflect the new retry mechanism and improved rate limit handling.

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[gemini-code-assist]

Code Review

This pull request effectively addresses the rate limiting and resource leak issues in GetAllAhHelmPackages. The introduction of exponential backoff is a solid improvement over a static sleep, and the resource leak from defer inside a loop is correctly fixed. My review includes a few suggestions to further improve robustness and maintainability: one critical fix for potential panics from unsafe type assertions, and recommendations to replace fmt.Println with proper logging and to use a constant for the retry count.

[gemini-code-assist]

These direct type assertions can cause a panic if the fields name or repository are missing from the API response, or if their types are not what's expected. This could crash the entire sync process.

It's much safer to use the two-value comma-ok idiom to check for success before using the value. For example:

name, ok := p["name"].(string)
if !ok {
    log.Printf("Skipping package due to missing or invalid name: %v", p)
    continue
}

repoMap, ok := p["repository"].(map[string]interface{})
if !ok {
    log.Printf("Skipping package due to missing or invalid repository: %v", p)
    continue
}

repo, ok := repoMap["name"].(string)
if !ok {
    log.Printf("Skipping package due to missing or invalid repository name: %v", p)
    continue
}

[leecalcote]

@copilot implement this feedback.

[gemini-code-assist]

The number of retries (5) is a magic number. It's better to define this as a constant (e.g., const maxRetries = 5) at the package or function level for improved readability and maintainability.

[gemini-code-assist]

Using fmt.Println for errors is not recommended in library code as it writes to standard output and offers no configurability (like levels, formatting, or output destination). This makes debugging in a larger application difficult. This applies to all fmt.Println calls in this function.

Consider using a structured logger. The project seems to use logrus elsewhere, but even the standard log package would be an improvement. For example:

import "log"
// ...
log.Printf("error during http get for url %s: %v", url, err)