diff --git a/activity.go b/activity.go
index 225ebb2..9081c9a 100644
--- a/activity.go
+++ b/activity.go
@@ -31,6 +31,7 @@ import (
 	"strings"
 	"time"
 
+	"humungus.tedunangst.com/r/webs/cache"
 	"humungus.tedunangst.com/r/webs/htfilter"
 	"humungus.tedunangst.com/r/webs/httpsig"
 	"humungus.tedunangst.com/r/webs/image"
@@ -256,7 +257,7 @@ type Box struct {
 	Shared string
 }
 
-var boxofboxes = cacheNew(cacheOptions{Filler: func(ident string) (*Box, bool) {
+var boxofboxes = cache.New(cache.Options{Filler: func(ident string) (*Box, bool) {
 	var info string
 	row := stmtGetXonker.QueryRow(ident, "boxes")
 	err := row.Scan(&info)
@@ -1118,7 +1119,7 @@ func jonkjonk(user *WhatAbout, h *Honk) (junk.Junk, junk.Junk) {
 	return j, jo
 }
 
-var oldjonks = cacheNew(cacheOptions{Filler: func(xid string) ([]byte, bool) {
+var oldjonks = cache.New(cache.Options{Filler: func(xid string) ([]byte, bool) {
 	row := stmtAnyXonk.QueryRow(xid)
 	honk := scanhonk(row)
 	if honk == nil || !honk.Public {
@@ -1185,7 +1186,7 @@ func honkworldwide(user *WhatAbout, honk *Honk) {
 	}
 }
 
-var oldjonkers = cacheNew(cacheOptions{Filler: func(name string) ([]byte, bool) {
+var oldjonkers = cache.New(cache.Options{Filler: func(name string) ([]byte, bool) {
 	user, err := butwhatabout(name)
 	if err != nil {
 		return nil, false
@@ -1226,7 +1227,7 @@ func asjonker(name string) ([]byte, bool) {
 	return j, ok
 }
 
-var handfull = cacheNew(cacheOptions{Filler: func(name string) (string, bool) {
+var handfull = cache.New(cache.Options{Filler: func(name string) (string, bool) {
 	m := strings.Split(name, "@")
 	if len(m) != 2 {
 		log.Printf("bad fish name: %s", name)
diff --git a/cache.go b/cache.go
deleted file mode 100644
index c2250a4..0000000
--- a/cache.go
+++ /dev/null
@@ -1,94 +0,0 @@
-//
-// Copyright (c) 2019 Ted Unangst <tedu@tedunangst.com>
-//
-// Permission to use, copy, modify, and distribute this software for any
-// purpose with or without fee is hereby granted, provided that the above
-// copyright notice and this permission notice appear in all copies.
-//
-// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-
-package main
-
-import (
-	"reflect"
-	"sync"
-	"time"
-)
-
-type cacheFiller func(key interface{}) (interface{}, bool)
-
-type cacheOptions struct {
-	Filler   interface{}
-	Duration time.Duration
-}
-
-type Cache struct {
-	cache    map[interface{}]interface{}
-	filler   cacheFiller
-	lock     sync.Mutex
-	stale    time.Time
-	duration time.Duration
-}
-
-func cacheNew(options cacheOptions) *Cache {
-	c := new(Cache)
-	c.cache = make(map[interface{}]interface{})
-	fillfn := options.Filler
-	ftype := reflect.TypeOf(fillfn)
-	if ftype.Kind() != reflect.Func {
-		panic("cache filler is not function")
-	}
-	if ftype.NumIn() != 1 || ftype.NumOut() != 2 {
-		panic("cache filler has wrong argument count")
-	}
-	c.filler = func(key interface{}) (interface{}, bool) {
-		vfn := reflect.ValueOf(fillfn)
-		args := []reflect.Value{reflect.ValueOf(key)}
-		rv := vfn.Call(args)
-		return rv[0].Interface(), rv[1].Bool()
-	}
-	if options.Duration != 0 {
-		c.duration = options.Duration
-		c.stale = time.Now().Add(c.duration)
-	}
-	return c
-}
-
-func (cache *Cache) Get(key interface{}, value interface{}) bool {
-	cache.lock.Lock()
-	defer cache.lock.Unlock()
-	if !cache.stale.IsZero() && cache.stale.Before(time.Now()) {
-		cache.stale = time.Now().Add(cache.duration)
-		cache.cache = make(map[interface{}]interface{})
-	}
-	v, ok := cache.cache[key]
-	if !ok {
-		v, ok = cache.filler(key)
-		if ok {
-			cache.cache[key] = v
-		}
-	}
-	if ok {
-		ptr := reflect.ValueOf(v)
-		reflect.ValueOf(value).Elem().Set(ptr)
-	}
-	return ok
-}
-
-func (cache *Cache) Clear(key interface{}) {
-	cache.lock.Lock()
-	defer cache.lock.Unlock()
-	delete(cache.cache, key)
-}
-
-func (cache *Cache) Flush() {
-	cache.lock.Lock()
-	defer cache.lock.Unlock()
-	cache.cache = make(map[interface{}]interface{})
-}
diff --git a/database.go b/database.go
index 708df2a..43f999e 100644
--- a/database.go
+++ b/database.go
@@ -26,10 +26,11 @@ import (
 	"strings"
 	"time"
 
+	"humungus.tedunangst.com/r/webs/cache"
 	"humungus.tedunangst.com/r/webs/login"
 )
 
-var someusers = cacheNew(cacheOptions{Filler: func(name string) (*WhatAbout, bool) {
+var someusers = cache.New(cache.Options{Filler: func(name string) (*WhatAbout, bool) {
 	row := stmtWhatAbout.QueryRow(name)
 	user := new(WhatAbout)
 	var options string
diff --git a/fun.go b/fun.go
index ed27385..953ad74 100644
--- a/fun.go
+++ b/fun.go
@@ -28,6 +28,7 @@ import (
 	"sync"
 
 	"golang.org/x/net/html"
+	"humungus.tedunangst.com/r/webs/cache"
 	"humungus.tedunangst.com/r/webs/htfilter"
 	"humungus.tedunangst.com/r/webs/httpsig"
 )
@@ -365,7 +366,7 @@ func quickrename(s string, userid int64) string {
 	return s
 }
 
-var shortnames = cacheNew(cacheOptions{Filler: func(userid int64) (map[string]string, bool) {
+var shortnames = cache.New(cache.Options{Filler: func(userid int64) (map[string]string, bool) {
 	honkers := gethonkers(userid)
 	m := make(map[string]string)
 	for _, h := range honkers {
diff --git a/hfcs.go b/hfcs.go
index 06f831e..50b4301 100644
--- a/hfcs.go
+++ b/hfcs.go
@@ -21,6 +21,8 @@ import (
 	"regexp"
 	"sort"
 	"time"
+
+	"humungus.tedunangst.com/r/webs/cache"
 )
 
 type Filter struct {
@@ -63,7 +65,7 @@ func (ft filtType) String() string {
 
 type afiltermap map[filtType][]*Filter
 
-var filtcache = cacheNew(cacheOptions{Filler: func(userid int64) (afiltermap, bool) {
+var filtcache = cache.New(cache.Options{Filler: func(userid int64) (afiltermap, bool) {
 	rows, err := stmtGetFilters.Query(userid)
 	if err != nil {
 		log.Printf("error querying filters: %s", err)
diff --git a/web.go b/web.go
index a18689e..ff9a320 100644
--- a/web.go
+++ b/web.go
@@ -33,6 +33,7 @@ import (
 	"time"
 
 	"github.com/gorilla/mux"
+	"humungus.tedunangst.com/r/webs/cache"
 	"humungus.tedunangst.com/r/webs/css"
 	"humungus.tedunangst.com/r/webs/htfilter"
 	"humungus.tedunangst.com/r/webs/httpsig"
@@ -471,7 +472,7 @@ func xzone(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-var oldoutbox = cacheNew(cacheOptions{Filler: func(name string) ([]byte, bool) {
+var oldoutbox = cache.New(cache.Options{Filler: func(name string) ([]byte, bool) {
 	user, err := butwhatabout(name)
 	if err != nil {
 		return nil, false
@@ -1235,7 +1236,7 @@ func showhonkers(w http.ResponseWriter, r *http.Request) {
 	}
 }
 
-var combocache = cacheNew(cacheOptions{Filler: func(userid int64) ([]string, bool) {
+var combocache = cache.New(cache.Options{Filler: func(userid int64) ([]string, bool) {
 	honkers := gethonkers(userid)
 	var combos []string
 	for _, h := range honkers {