go.mod: update mds to v0.19.3 and update cache usage

Author: creachadair

go.mod

@@ -11,7 +11,7 @@ require (
 	github.com/creachadair/command v0.1.15
 	github.com/creachadair/flax v0.0.1
 	github.com/creachadair/gocache v0.0.0-20240904225701-6c4617815112
-	github.com/creachadair/mds v0.19.2
+	github.com/creachadair/mds v0.19.3
 	github.com/creachadair/mhttp v0.0.0-20240907154916-d408c0542750
 	github.com/creachadair/scheddle v0.0.0-20240908173745-88f3b31b6673
 	github.com/creachadair/taskgroup v0.9.3

go.sum

@@ -48,8 +48,8 @@ github.com/creachadair/flax v0.0.1 h1:it+joEf9aEUalaV7XWll/pk6zA4/FbNvMImW9q/lS8
 github.com/creachadair/flax v0.0.1/go.mod h1:K8bFvn8hMdAljQkaKNc7I3os5Wk36JxkyCkfdZ7S8d4=
 github.com/creachadair/gocache v0.0.0-20240904225701-6c4617815112 h1:FSlFO2eztBGGzp67D2z/eeNe5U+AZyj4g/CjKf0AHbo=
 github.com/creachadair/gocache v0.0.0-20240904225701-6c4617815112/go.mod h1:vkGW73GdzBPQZJdFlPBZVzFcG7lTxIgDY0+U30mp3xs=
-github.com/creachadair/mds v0.19.2 h1:I5OdjsrG2jqGklMcyv50Iqo6gTrwUSIpIJVSnlVw85c=
-github.com/creachadair/mds v0.19.2/go.mod h1:4b//mUiL8YldH6TImXjmW45myzTLNS1LLjOmrk888eg=
+github.com/creachadair/mds v0.19.3 h1:qBkZ5d8SNtJZXQTYs7tYqEIwCD6ifchNTIjhYRThLNw=
+github.com/creachadair/mds v0.19.3/go.mod h1:4b//mUiL8YldH6TImXjmW45myzTLNS1LLjOmrk888eg=
 github.com/creachadair/mhttp v0.0.0-20240907154916-d408c0542750 h1:fJzQV75gKAfx1Od7EiQI9rn0wTvO7Uc/YgQW54y77dQ=
 github.com/creachadair/mhttp v0.0.0-20240907154916-d408c0542750/go.mod h1:WDSdP3YUQE4YJNxq77RUCZRIvh1l2o8y58bbHsBffo4=
 github.com/creachadair/msync v0.3.0 h1:7FoPzwrM4gAdfsj7mcVyodKV82fArJaKcgr9j9whYww=

lib/revproxy/cache.go

@@ -155,3 +155,5 @@ type memCacheEntry struct {
 	header http.Header
 	body   []byte
 }
+
+func entrySize(e memCacheEntry) int64 { return int64(len(e.body)) }

lib/revproxy/revproxy.go

@@ -114,13 +114,9 @@ func (s *Server) init() {
 	s.initOnce.Do(func() {
 		nt := runtime.NumCPU()
 		s.tasks, s.start = taskgroup.New(nil).Limit(nt)
-		s.mcache = cache.New(cache.Config[string, memCacheEntry]{
-			Limit: 10 << 20,
-			Store: cache.LRU[string, memCacheEntry](),
-			Size: func(e memCacheEntry) int64 {
-				return int64(len(e.body))
-			},
-		})
+		s.mcache = cache.New(10<<20, cache.LRU[string, memCacheEntry]().
+			WithSize(entrySize),
+		)
 		s.expire = scheddle.NewQueue(nil)
 	})
 }