67 lines
1.8 KiB
Go
67 lines
1.8 KiB
Go
package utils
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import (
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"context"
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"fmt"
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"math"
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"net/http"
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"time"
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)
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type RetryConfig struct {
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MaxRetries int
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BaseDelay time.Duration
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MaxDelay time.Duration
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}
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func RetryableHTTPRequest(ctx context.Context, url string) (*http.Response, error) {
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client := &http.Client{
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Timeout: 30 * time.Second,
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}
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var lastErr error
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for attempt := 0; attempt <= 3; attempt++ {
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// Create request with context
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req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
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if err != nil {
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return nil, fmt.Errorf("failed to create request: %w", err)
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}
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req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")
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resp, err := client.Do(req)
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if err != nil {
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lastErr = err
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fmt.Printf("Request attempt %d failed: %v\n", attempt+1, err)
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} else if resp.StatusCode >= http.StatusOK && resp.StatusCode < http.StatusMultipleChoices {
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// Success
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return resp, nil
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} else if resp.StatusCode == http.StatusTooManyRequests {
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// 429 Too Many Requests - retry with backoff
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resp.Body.Close()
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lastErr = fmt.Errorf("rate limited: %d %s", resp.StatusCode, resp.Status)
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fmt.Printf("Request attempt %d failed with status %d (rate limited)\n", attempt+1, resp.StatusCode)
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} else {
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// All other errors (4xx, 5xx) - don't retry
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resp.Body.Close()
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return nil, fmt.Errorf("request failed %d: %s", resp.StatusCode, resp.Status)
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}
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// max attempts for now = 3
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if attempt < 3 {
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delay := min(time.Duration(math.Pow(2, float64(attempt)))*1*time.Second, 30*time.Second)
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fmt.Printf("Retrying in %v... (attempt %d/%d)\n", delay, attempt+1, 3)
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select {
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case <-ctx.Done():
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return nil, ctx.Err()
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case <-time.After(delay):
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// Continue to next attempt
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}
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}
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}
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return nil, fmt.Errorf("all retry attempts failed, last error: %w", lastErr)
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}
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