feat(api): add server-side caching for requests that could benefit (#3463)

* feat(api): add server-side caching for requests that could benefit for them

* fix(tests): do not cache responses while in tests

* fix: remove commented out leftover code

* chore(deps): update dependency html-webpack-plugin to v5.5.4

* Bundle embedded web app

* fix: remove caching for web app assets under test

* chore(tests): re-enable temporarily disabled test

* chore(deps): update dependency typescript to v5.3.3

* Bundle embedded web app

* chore(deps): update dependency npm to v10.2.5

* Bundle embedded web app

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Owncast <owncast@owncast.online>

config/constants.go

@@ -30,4 +30,8 @@ var (
 
 	// PublicFilesPath is the optional directory for hosting public files.
 	PublicFilesPath = filepath.Join(DataDirectory, "public")
+
+	// DisableResponseCaching will disable caching of API and resource
+	// responses. Disable this feature to turn off the optimizations.
+	DisableResponseCaching = false
 )

controllers/hls.go

@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/owncast/owncast/config"
 	"github.com/owncast/owncast/core"
@@ -13,8 +14,19 @@ import (
 	"github.com/owncast/owncast/models"
 	"github.com/owncast/owncast/router/middleware"
 	"github.com/owncast/owncast/utils"
+	log "github.com/sirupsen/logrus"
+	cache "github.com/victorspringer/http-cache"
+	"github.com/victorspringer/http-cache/adapter/memory"
 )
 
+type FileServerHandler struct {
+	HLSPath string
+}
+
+func (fsh *FileServerHandler) ServeHTTP(rw http.ResponseWriter, r *http.Request) {
+	http.ServeFile(rw, r, fsh.HLSPath)
+}
+
 // HandleHLSRequest will manage all requests to HLS content.
 func HandleHLSRequest(w http.ResponseWriter, r *http.Request) {
 	// Sanity check to limit requests to HLS file types.
@@ -23,6 +35,26 @@ func HandleHLSRequest(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	responseCache, err := memory.NewAdapter(
+		memory.AdapterWithAlgorithm(memory.LRU),
+		memory.AdapterWithCapacity(20),
+		memory.AdapterWithStorageCapacity(209_715_200),
+	)
+	if err != nil {
+		log.Warn("unable to create web cache", err)
+	}
+
+	// Since HLS segments cannot be changed once they're rendered, we can cache
+	// individual segments for a long time.
+	longTermHLSSegmentCache, err := cache.NewClient(
+		cache.ClientWithAdapter(responseCache),
+		cache.ClientWithTTL(30*time.Second),
+		cache.ClientWithExpiresHeader(),
+	)
+	if err != nil {
+		log.Warn("unable to create web cache client", err)
+	}
+
 	requestedPath := r.URL.Path
 	relativePath := strings.Replace(requestedPath, "/hls/", "", 1)
 	fullPath := filepath.Join(config.HLSStoragePath, relativePath)
@@ -48,6 +80,10 @@ func HandleHLSRequest(w http.ResponseWriter, r *http.Request) {
 	} else {
 		cacheTime := utils.GetCacheDurationSecondsForPath(relativePath)
 		w.Header().Set("Cache-Control", "public, max-age="+strconv.Itoa(cacheTime))
+
+		fileServer := &FileServerHandler{HLSPath: fullPath}
+		longTermHLSSegmentCache.Middleware(fileServer).ServeHTTP(w, r)
+		return
 	}
 
 	middleware.EnableCors(w)

go.mod

@@ -69,6 +69,7 @@ require (
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/oschwald/maxminddb-golang v1.11.0 // indirect
 	github.com/shoenig/go-m1cpu v0.1.6 // indirect
+	github.com/victorspringer/http-cache v0.0.0-20231006141456-6446fe59efba // indirect
 )
 
 require (

go.sum

@@ -138,6 +138,8 @@ github.com/tklauser/numcpus v0.6.1/go.mod h1:1XfjsgE2zo8GVw7POkMbHENHzVg3GzmoZ9f
 github.com/ulikunitz/xz v0.5.11/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/valyala/gozstd v1.20.1 h1:xPnnnvjmaDDitMFfDxmQ4vpx0+3CdTg2o3lALvXTU/g=
 github.com/valyala/gozstd v1.20.1/go.mod h1:y5Ew47GLlP37EkTB+B4s7r6A5rdaeB7ftbl9zoYiIPQ=
+github.com/victorspringer/http-cache v0.0.0-20231006141456-6446fe59efba h1:+oqDKQIOdkkvro1psUKtI4oH9WBeKkGY2S8h9/lo288=
+github.com/victorspringer/http-cache v0.0.0-20231006141456-6446fe59efba/go.mod h1:D1AD6nlXv7HkIfTVd8ZWK1KQEiXYNy/LbLkx8H9tIQw=
 github.com/yuin/goldmark v1.3.7/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 github.com/yuin/goldmark v1.6.0 h1:boZcn2GTjpsynOsC0iJHnBWa4Bi0qzfJjthwauItG68=

main.go

@@ -28,6 +28,7 @@ var (
 	webServerPortOverride  = flag.String("webserverport", "", "Force the web server to listen on a specific port")
 	webServerIPOverride    = flag.String("webserverip", "", "Force web server to listen on this IP address")
 	rtmpPortOverride       = flag.Int("rtmpport", 0, "Set listen port for the RTMP server")
+	disableResponseCaching = flag.Bool("disableResponseCaching", false, "Do not optimize performance by caching of web responses")
 )
 
 // nolint:cyclop
@@ -42,6 +43,10 @@ func main() {
 		config.BackupDirectory = *backupDirectory
 	}
 
+	if *disableResponseCaching {
+		config.DisableResponseCaching = *disableResponseCaching
+	}
+
 	// Create the data directory if needed
 	if !utils.DoesFileExists("data") {
 		if err := os.Mkdir("./data", 0o700); err != nil {

router/router.go

@@ -24,52 +24,131 @@ import (
 	"github.com/owncast/owncast/router/middleware"
 	"github.com/owncast/owncast/utils"
 	"github.com/owncast/owncast/yp"
+
+	cache "github.com/victorspringer/http-cache"
+	"github.com/victorspringer/http-cache/adapter/memory"
 )
 
 // Start starts the router for the http, ws, and rtmp.
 func Start() error {
+	// Setup a web response cache
+	enableCache := !config.DisableResponseCaching
+
+	responseCache, err := memory.NewAdapter(
+		memory.AdapterWithAlgorithm(memory.LRU),
+		memory.AdapterWithCapacity(50),
+	)
+	if err != nil {
+		log.Warn("unable to create web cache", err)
+	}
+
+	superShortCacheClient, err := cache.NewClient(
+		cache.ClientWithAdapter(responseCache),
+		cache.ClientWithTTL(3*time.Second),
+	)
+	if err != nil {
+		log.Warn("unable to create web cache client", err)
+	}
+	reasonableDurationCacheClient, err := cache.NewClient(
+		cache.ClientWithAdapter(responseCache),
+		cache.ClientWithTTL(8*time.Second),
+	)
+	if err != nil {
+		log.Warn("unable to create web cache client", err)
+	}
+	longerDurationCacheClient, err := cache.NewClient(
+		cache.ClientWithAdapter(responseCache),
+		cache.ClientWithTTL(3*time.Minute),
+	)
+	if err != nil {
+		log.Warn("unable to create web cache client", err)
+	}
 	// The primary web app.
+	if enableCache {
+		http.HandleFunc("/", func(rw http.ResponseWriter, r *http.Request) {
+			longerDurationCacheClient.Middleware(http.HandlerFunc(controllers.IndexHandler)).ServeHTTP(rw, r)
+		})
+	} else {
 		http.HandleFunc("/", controllers.IndexHandler)
+	}
 
 	// The admin web app.
 	http.HandleFunc("/admin/", middleware.RequireAdminAuth(controllers.IndexHandler))
 
 	// Images
-	http.HandleFunc("/thumbnail.jpg", controllers.GetThumbnail)
-	http.HandleFunc("/preview.gif", controllers.GetPreview)
-	http.HandleFunc("/logo", controllers.GetLogo)
+	http.HandleFunc("/thumbnail.jpg", func(rw http.ResponseWriter, r *http.Request) {
+		superShortCacheClient.Middleware(http.HandlerFunc(controllers.GetThumbnail)).ServeHTTP(rw, r)
+	})
+
+	http.HandleFunc("/preview.gif", func(rw http.ResponseWriter, r *http.Request) {
+		superShortCacheClient.Middleware(http.HandlerFunc(controllers.GetPreview)).ServeHTTP(rw, r)
+	})
+
+	http.HandleFunc("/logo", func(rw http.ResponseWriter, r *http.Request) {
+		longerDurationCacheClient.Middleware(http.HandlerFunc(controllers.GetLogo)).ServeHTTP(rw, r)
+	})
 
 	// Custom Javascript
-	http.HandleFunc("/customjavascript", controllers.ServeCustomJavascript)
+	http.HandleFunc("/customjavascript", func(rw http.ResponseWriter, r *http.Request) {
+		longerDurationCacheClient.Middleware(http.HandlerFunc(controllers.ServeCustomJavascript)).ServeHTTP(rw, r)
+	})
 
 	// Return a single emoji image.
-	http.HandleFunc(config.EmojiDir, controllers.GetCustomEmojiImage)
+	http.HandleFunc(config.EmojiDir, func(rw http.ResponseWriter, r *http.Request) {
+		longerDurationCacheClient.Middleware(http.HandlerFunc(controllers.GetCustomEmojiImage)).ServeHTTP(rw, r)
+	})
 
 	// return the logo
 
 	// return a logo that's compatible with external social networks
-	http.HandleFunc("/logo/external", controllers.GetCompatibleLogo)
+	http.HandleFunc("/logo/external", func(rw http.ResponseWriter, r *http.Request) {
+		longerDurationCacheClient.Middleware(http.HandlerFunc(controllers.GetCompatibleLogo)).ServeHTTP(rw, r)
+	})
 
 	// robots.txt
-	http.HandleFunc("/robots.txt", controllers.GetRobotsDotTxt)
+	http.HandleFunc("/robots.txt", func(rw http.ResponseWriter, r *http.Request) {
+		longerDurationCacheClient.Middleware(http.HandlerFunc(controllers.GetRobotsDotTxt)).ServeHTTP(rw, r)
+	})
 
 	// status of the system
+	if enableCache {
+		http.HandleFunc("/api/status", func(rw http.ResponseWriter, r *http.Request) {
+			superShortCacheClient.Middleware(http.HandlerFunc(controllers.GetStatus)).ServeHTTP(rw, r)
+		})
+	} else {
 		http.HandleFunc("/api/status", controllers.GetStatus)
+	}
 
 	// custom emoji supported in the chat
-	http.HandleFunc("/api/emoji", controllers.GetCustomEmojiList)
+	http.HandleFunc("/api/emoji", func(rw http.ResponseWriter, r *http.Request) {
+		reasonableDurationCacheClient.Middleware(http.HandlerFunc(controllers.GetCustomEmojiList)).ServeHTTP(rw, r)
+	})
 
 	// chat rest api
+	if enableCache {
+		http.HandleFunc("/api/chat", func(rw http.ResponseWriter, r *http.Request) {
+			superShortCacheClient.Middleware(middleware.RequireUserAccessToken(controllers.GetChatMessages))
+		})
+	} else {
 		http.HandleFunc("/api/chat", middleware.RequireUserAccessToken(controllers.GetChatMessages))
+	}
 
 	// web config api
+	if enableCache {
+		http.HandleFunc("/api/config", func(rw http.ResponseWriter, r *http.Request) {
+			superShortCacheClient.Middleware(http.HandlerFunc(controllers.GetWebConfig)).ServeHTTP(rw, r)
+		})
+	} else {
 		http.HandleFunc("/api/config", controllers.GetWebConfig)
+	}
 
 	// return the YP protocol data
 	http.HandleFunc("/api/yp", yp.GetYPResponse)
 
 	// list of all social platforms
-	http.HandleFunc("/api/socialplatforms", controllers.GetAllSocialPlatforms)
+	http.HandleFunc("/api/socialplatforms", func(rw http.ResponseWriter, r *http.Request) {
+		reasonableDurationCacheClient.Middleware(http.HandlerFunc(controllers.GetAllSocialPlatforms)).ServeHTTP(rw, r)
+	})
 
 	// return the list of video variants available
 	http.HandleFunc("/api/video/variants", controllers.GetVideoStreamOutputVariants)
@@ -84,7 +163,9 @@ func Start() error {
 	http.HandleFunc("/api/remotefollow", controllers.RemoteFollow)
 
 	// return followers
-	http.HandleFunc("/api/followers", middleware.HandlePagination(controllers.GetFollowers))
+	http.HandleFunc("/api/followers", func(rw http.ResponseWriter, r *http.Request) {
+		reasonableDurationCacheClient.Middleware(middleware.HandlePagination(controllers.GetFollowers)).ServeHTTP(rw, r)
+	})
 
 	// save client video playback metrics
 	http.HandleFunc("/api/metrics/playback", controllers.ReportPlaybackMetrics)

static/web/_next/static/-4yiuyziZt_OmyIpMdoZe/_ssgManifest.js

@@ -0,0 +1 @@
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test/automated/api/federation.test.js

@@ -9,9 +9,9 @@ request = request('http://127.0.0.1:8080');
 var ajv = new Ajv();
 var nodeInfoSchema = jsonfile.readFileSync('schema/nodeinfo_2.0.json');
 
-const serverName = 'owncast.server.test'
-const serverURL = 'http://' + serverName
-const fediUsername = 'streamer'
+const serverName = 'owncast.server.test';
+const serverURL = 'http://' + serverName;
+const fediUsername = 'streamer';
 
 test('disable federation', async (done) => {
 	const res = await sendAdminRequest('config/federation/enable', false);
@@ -59,10 +59,7 @@ test('verify responses of /federation/ when federation is disabled', async (done
 });
 
 test('set required parameters and enable federation', async (done) => {
-	const res1 = await sendAdminRequest(
-		'config/serverurl',
-		serverURL
-	);
+	const res1 = await sendAdminRequest('config/serverurl', serverURL);
 	const res2 = await sendAdminRequest(
 		'config/federation/username',
 		fediUsername
@@ -73,28 +70,47 @@ test('set required parameters and enable federation', async (done) => {
 
 test('verify responses of /.well-known/webfinger when federation is enabled', async (done) => {
 	const resNoResource = request.get('/.well-known/webfinger').expect(400);
-	const resBadResource = request.get(
-		'/.well-known/webfinger?resource=' + fediUsername + '@' + serverName
-	).expect(400);
-	const resBadResource2 = request.get(
-		'/.well-known/webfinger?resource=notacct:' + fediUsername + '@' + serverName
-	).expect(400);
-	const resBadServer = request.get(
-		'/.well-known/webfinger?resource=acct:' + fediUsername + '@not' + serverName
-	).expect(404);
-	const resBadUser = request.get(
-		'/.well-known/webfinger?resource=acct:not' + fediUsername + '@' + serverName
-	).expect(404);
-	const resNoAccept = request.get(
+	const resBadResource = request
+		.get('/.well-known/webfinger?resource=' + fediUsername + '@' + serverName)
+		.expect(400);
+	const resBadResource2 = request
+		.get(
+			'/.well-known/webfinger?resource=notacct:' +
+				fediUsername +
+				'@' +
+				serverName
+		)
+		.expect(400);
+	const resBadServer = request
+		.get(
+			'/.well-known/webfinger?resource=acct:' +
+				fediUsername +
+				'@not' +
+				serverName
+		)
+		.expect(404);
+	const resBadUser = request
+		.get(
+			'/.well-known/webfinger?resource=acct:not' +
+				fediUsername +
+				'@' +
+				serverName
+		)
+		.expect(404);
+	const resNoAccept = request
+		.get(
 			'/.well-known/webfinger?resource=acct:' + fediUsername + '@' + serverName
-	).expect(200)
+		)
+		.expect(200)
 		.expect('Content-Type', /json/)
 		.then((res) => {
 			parseJson(res.text);
 		});
-	const resWithAccept = request.get(
+	const resWithAccept = request
+		.get(
 			'/.well-known/webfinger?resource=acct:' + fediUsername + '@' + serverName
-	).expect(200)
+		)
+		.expect(200)
 		.set('Accept', 'application/json')
 		.expect('Content-Type', /json/)
 		.then((res) => {
@@ -104,14 +120,16 @@ test('verify responses of /.well-known/webfinger when federation is enabled', as
 });
 
 test('verify responses of /.well-known/host-meta when federation is enabled', async (done) => {
-	const res = request.get('/.well-known/host-meta')
+	const res = request
+		.get('/.well-known/host-meta')
 		.expect(200)
 		.expect('Content-Type', /xml/);
 	done();
 });
 
 test('verify responses of /.well-known/nodeinfo when federation is enabled', async (done) => {
-	const res = request.get('/.well-known/nodeinfo')
+	const res = request
+		.get('/.well-known/nodeinfo')
 		.expect(200)
 		.expect('Content-Type', /json/)
 		.then((res) => {
@@ -121,7 +139,8 @@ test('verify responses of /.well-known/nodeinfo when federation is enabled', asy
 });
 
 test('verify responses of /.well-known/x-nodeinfo2 when federation is enabled', async (done) => {
-	const res = request.get('/.well-known/x-nodeinfo2')
+	const res = request
+		.get('/.well-known/x-nodeinfo2')
 		.expect(200)
 		.expect('Content-Type', /json/)
 		.then((res) => {
@@ -143,7 +162,8 @@ test('verify responses of /nodeinfo/2.0 when federation is enabled', async (done
 });
 
 test('verify responses of /api/v1/instance when federation is enabled', async (done) => {
-	const res = request.get('/api/v1/instance')
+	const res = request
+		.get('/api/v1/instance')
 		.expect(200)
 		.expect('Content-Type', /json/)
 		.then((res) => {
@@ -153,15 +173,17 @@ test('verify responses of /api/v1/instance when federation is enabled', async (d
 });
 
 test('verify responses of /federation/user/ when federation is enabled', async (done) => {
-	const resNoAccept = request.get('/federation/user/')
-		.expect(307);
-	const resWithAccept = request.get('/federation/user/')
+	const resNoAccept = request.get('/federation/user/').expect(307);
+	const resWithAccept = request
+		.get('/federation/user/')
 		.set('Accept', 'application/json')
 		.expect(404);
-	const resWithAcceptWrongUsername = request.get('/federation/user/not' + fediUsername)
+	const resWithAcceptWrongUsername = request
+		.get('/federation/user/not' + fediUsername)
 		.set('Accept', 'application/json')
 		.expect(404);
-	const resWithAcceptUsername = request.get('/federation/user/' + fediUsername)
+	const resWithAcceptUsername = request
+		.get('/federation/user/' + fediUsername)
 		.set('Accept', 'application/json')
 		.expect(200)
 		.expect('Content-Type', /json/)
@@ -172,9 +194,9 @@ test('verify responses of /federation/user/ when federation is enabled', async (
 });
 
 test('verify responses of /federation/ when federation is enabled', async (done) => {
-	const resNoAccept = request.get('/federation/')
-		.expect(307);
-	const resWithAccept = request.get('/federation/')
+	const resNoAccept = request.get('/federation/').expect(307);
+	const resWithAccept = request
+		.get('/federation/')
 		.set('Accept', 'application/json')
 		.expect(404);
 	done();

test/automated/tools.sh

@@ -43,7 +43,7 @@ function start_owncast() {
 	go build -o owncast main.go
 
 	echo "Running owncast..."
-    ./owncast -database "$TEMP_DB" &
+	./owncast -disableResponseCaching -database "$TEMP_DB" &
 	SERVER_PID=$!
 	popd >/dev/null