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feat: use Cache-Control max-age and Expires headers to calculate next check

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This commit is contained in:
Frédéric Guillot 2025-04-06 16:18:41 -07:00
parent 0af1a6e121
commit c45b51d1f8
3 changed files with 110 additions and 2 deletions
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28
internal/reader/fetcher/response_handler.go
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@ -9,6 +9,7 @@ import (
"fmt"
"io"
"log/slog"
"math"
"net"
"net/http"
"net/url"
@ -53,6 +54,33 @@ func (r *ResponseHandler) ETag() string {
return r.httpResponse.Header.Get("ETag")
}
func (r *ResponseHandler) ExpiresInMinutes() int {
expiresHeaderValue := r.httpResponse.Header.Get("Expires")
if expiresHeaderValue != "" {
t, err := time.Parse(time.RFC1123, expiresHeaderValue)
if err == nil {
return int(math.Ceil(time.Until(t).Minutes()))
}
}
return 0
}
func (r *ResponseHandler) CacheControlMaxAgeInMinutes() int {
cacheControlHeaderValue := r.httpResponse.Header.Get("Cache-Control")
if cacheControlHeaderValue != "" {
for _, directive := range strings.Split(cacheControlHeaderValue, ",") {
directive = strings.TrimSpace(directive)
if strings.HasPrefix(directive, "max-age=") {
maxAge, err := strconv.Atoi(strings.TrimPrefix(directive, "max-age="))
if err == nil {
return int(math.Ceil(float64(maxAge) / 60))
}
}
}
}
return 0
}
func (r *ResponseHandler) ParseRetryDelay() int {
retryAfterHeaderValue := r.httpResponse.Header.Get("Retry-After")
if retryAfterHeaderValue != "" {