95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
package middleware
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import (
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"fmt"
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"net/http"
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"time"
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"github.com/mikestefanello/pagoda/context"
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"github.com/eko/gocache/v2/cache"
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"github.com/eko/gocache/v2/marshaler"
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"github.com/go-redis/redis/v8"
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"github.com/labstack/echo/v4"
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)
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// CachedPage is what is used to store a rendered Page in the cache
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type CachedPage struct {
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// URL stores the URL of the requested page
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URL string
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// HTML stores the complete HTML of the rendered Page
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HTML []byte
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// StatusCode stores the HTTP status code
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StatusCode int
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// Headers stores the HTTP headers
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Headers map[string]string
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}
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// ServeCachedPage attempts to load a page from the cache by matching on the complete request URL
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// If a page is cached for the requested URL, it will be served here and the request terminated.
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// Any request made by an authenticated user or that is not a GET will be skipped.
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func ServeCachedPage(ch *cache.Cache) echo.MiddlewareFunc {
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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) error {
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// Skip non GET requests
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if c.Request().Method != http.MethodGet {
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return next(c)
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}
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// Skip if the user is authenticated
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if c.Get(context.AuthenticatedUserKey) != nil {
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return next(c)
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}
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// Attempt to load from cache
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res, err := marshaler.New(ch).Get(
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c.Request().Context(),
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c.Request().URL.String(),
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new(CachedPage),
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)
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if err != nil {
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if err == redis.Nil {
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c.Logger().Info("no cached page found")
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} else {
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c.Logger().Errorf("failed getting cached page: %v", err)
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}
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return next(c)
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}
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page, ok := res.(*CachedPage)
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if !ok {
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c.Logger().Errorf("failed casting cached page")
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return next(c)
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}
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// Set any headers
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if page.Headers != nil {
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for k, v := range page.Headers {
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c.Response().Header().Set(k, v)
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}
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}
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c.Logger().Info("serving cached page")
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return c.HTMLBlob(page.StatusCode, page.HTML)
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}
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}
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}
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// CacheControl sets a Cache-Control header with a given max age
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func CacheControl(maxAge time.Duration) echo.MiddlewareFunc {
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return func(next echo.HandlerFunc) echo.HandlerFunc {
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return func(c echo.Context) error {
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v := "no-cache, no-store"
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if maxAge > 0 {
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v = fmt.Sprintf("public, max-age=%.0f", maxAge.Seconds())
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}
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c.Response().Header().Set("Cache-Control", v)
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return next(c)
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}
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}
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}
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