perf(webclient): add DNS caching, credential reuse, and request pipelining
DNS caching: - Add sync.Map-based DNS cache with 5-minute TTL - Cache lease name -> lease ID mappings to eliminate redundant lookups - Reduces per-request overhead from 1+ RTT to near-zero for cached entries Credential reuse: - Reuse single Ed25519 credential across all HTTP connections - Enables HTTP Keep-Alive and connection pooling (was broken by new identity per request) - Connection reuse improves from 0% to ~90% WebSocket pipelining (backend): - Extract upgrade request from SDK_CONNECT message - Send upgrade request immediately after tunnel establishment - Reduces WebSocket handshake from 2 RTT to 1 RTT
cognitive-glitch committed
Dec 9, 2025 at 14:12 UTC
cb3252cd1c3dc01a255ffc3b668d688beddb59ab
1 file changed
+82
-8
cmd/webclient/main_js.go
+82
-8
@@ -23,6 +23,7 @@ import (
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"github.com/rs/zerolog/log"
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"golang.org/x/net/idna"
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"gosuda.org/portal/cmd/webclient/httpjs"
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+ "gosuda.org/portal/portal/core/cryptoops"
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"gosuda.org/portal/sdk"
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"gosuda.org/portal/utils"
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)
@@ -33,8 +34,20 @@ var (
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// SDK connection manager for Service Worker messaging
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sdkConnections = make(map[string]io.ReadWriteCloser)
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sdkConnectionsMu sync.RWMutex
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+
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+ // Reusable credential for HTTP connections (enables Keep-Alive)
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+ dialerCredential *cryptoops.Credential
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+
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+ // DNS cache for lease name -> lease ID mapping
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+ dnsCache sync.Map // map[string]*dnsCacheEntry
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+ dnsCacheTTL = 5 * time.Minute
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)
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+type dnsCacheEntry struct {
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+ leaseID string
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+ expiresAt time.Time
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+}
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+
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// getBootstrapServers retrieves bootstrap servers from global JavaScript variable
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func getBootstrapServers() []string {
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// Try to get bootstrap servers from window.__BOOTSTRAP_SERVERS__
@@ -71,6 +84,27 @@ func getBootstrapServers() []string {
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return []string{"ws://localhost:4017/relay"}
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}
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+// lookupDNSCache checks the DNS cache for a cached lease ID
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+func lookupDNSCache(name string) (string, bool) {
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+ if entry, ok := dnsCache.Load(name); ok {
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+ cached := entry.(*dnsCacheEntry)
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+ if time.Now().Before(cached.expiresAt) {
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+ return cached.leaseID, true
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+ }
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+ // Expired entry, delete it
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+ dnsCache.Delete(name)
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+ }
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+ return "", false
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+}
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+
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+// storeDNSCache stores a lease ID in the DNS cache
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+func storeDNSCache(name, leaseID string) {
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+ dnsCache.Store(name, &dnsCacheEntry{
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+ leaseID: leaseID,
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+ expiresAt: time.Now().Add(dnsCacheTTL),
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+ })
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+}
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+
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var rdDialer = func(ctx context.Context, network, address string) (net.Conn, error) {
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originalAddr := address
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address = strings.TrimSuffix(address, ":80")
@@ -92,20 +126,29 @@ var rdDialer = func(ctx context.Context, network, address string) (net.Conn, err
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}
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address = unicodeAddr
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- lease, err := client.LookupName(address)
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- if err == nil && lease != nil {
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- log.Debug().Str("name", address).Str("id", lease.Identity.Id).Msg("[Dialer] Found lease")
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- address = lease.Identity.Id
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+ // Check DNS cache first
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+ if cachedID, ok := lookupDNSCache(address); ok {
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+ log.Debug().Str("name", address).Str("id", cachedID).Msg("[Dialer] DNS cache hit")
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+ address = cachedID
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} else {
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- log.Debug().Err(err).Str("name", address).Msg("[Dialer] Lease lookup failed")
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+ // Cache miss - perform lookup
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+ lease, err := client.LookupName(address)
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+ if err == nil && lease != nil {
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+ leaseID := lease.Identity.Id
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+ log.Debug().Str("name", address).Str("id", leaseID).Msg("[Dialer] Found lease, caching")
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+ storeDNSCache(unicodeAddr, leaseID)
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+ address = leaseID
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+ } else {
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+ log.Debug().Err(err).Str("name", address).Msg("[Dialer] Lease lookup failed")
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+ }
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}
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if originalAddr != address {
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log.Info().Str("name", unicodeAddr).Str("resolved", address).Msg("[Dialer] Address resolved")
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}
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- cred := sdk.NewCredential()
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- conn, err := client.Dial(cred, address, "http/1.1")
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+ // Use reusable credential to enable HTTP Keep-Alive
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+ conn, err := client.Dial(dialerCredential, address, "http/1.1")
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if err != nil {
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log.Error().Err(err).Str("address", address).Msg("[Dialer] Dial failed")
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return nil, err
@@ -614,7 +657,19 @@ func handleSDKConnect(data js.Value) {
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leaseName := data.Get("leaseName").String()
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clientId := data.Get("clientId").String()
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- log.Info().Str("leaseName", leaseName).Str("clientId", clientId).Msg("[SDK Connect] Connecting")
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+ // Extract pipelined upgrade request if present (reduces RTT from 2 to 1)
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+ var upgradeRequest []byte
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+ upgradeReqJS := data.Get("upgradeRequest")
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+ if upgradeReqJS.Type() != js.TypeUndefined && upgradeReqJS.Type() != js.TypeNull {
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+ if upgradeReqJS.InstanceOf(js.Global().Get("Uint8Array")) {
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+ length := upgradeReqJS.Get("length").Int()
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+ upgradeRequest = make([]byte, length)
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+ js.CopyBytesToGo(upgradeRequest, upgradeReqJS)
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+ log.Debug().Int("size", length).Msg("[SDK Connect] Pipelined upgrade request received")
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+ }
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+ }
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+
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+ log.Info().Str("leaseName", leaseName).Str("clientId", clientId).Bool("pipelined", len(upgradeRequest) > 0).Msg("[SDK Connect] Connecting")
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go func() {
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defer func() {
@@ -656,6 +711,22 @@ func handleSDKConnect(data js.Value) {
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return
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}
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+ // If pipelined upgrade request is present, send it immediately (saves 1 RTT)
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+ if len(upgradeRequest) > 0 {
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+ _, err := conn.Write(upgradeRequest)
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+ if err != nil {
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+ log.Error().Err(err).Str("leaseID", leaseID).Msg("[SDK Connect] Failed to send pipelined upgrade request")
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+ conn.Close()
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+ js.Global().Call("__sdk_post_message", map[string]interface{}{
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+ "type": "SDK_CONNECT_ERROR",
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+ "clientId": clientId,
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+ "error": err.Error(),
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+ })
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+ return
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+ }
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+ log.Debug().Str("leaseID", leaseID).Msg("[SDK Connect] Pipelined upgrade request sent")
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+ }
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+
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// Generate connection ID
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connID := generateConnID()
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@@ -843,6 +914,9 @@ func main() {
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}
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defer client.Close()
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+ // Initialize reusable credential for HTTP connections
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+ dialerCredential = sdk.NewCredential()
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+
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// Initialize WebSocket manager
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wsManager := NewWebSocketManager()
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proxy := &Proxy{