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Addresses three critical network issues for LLM streaming performance: **#33 Disable proxy buffering for SSE** - Add X-Accel-Buffering: no header to response - Tells nginx/Ingress to stream events immediately instead of buffering - Paired with ResponseController.Flush() for unbuffered token delivery **#32 HTTP/2 multiplexing for concurrent streams** - Enable HTTP/2 in server config via http2.ConfigureServer() - Increase MaxConnsPerHost from default (2) to 10 - ForceAttemptHTTP2 on outbound Transport for upstream connections - Allows multiple concurrent LLM requests without blocking **#31 TCP backpressure for streaming LLM responses** - Set TCP_NODELAY on dialer to disable Nagle's algorithm - Reduces latency by sending small packets immediately - Critical for low TTFT (time-to-first-token) under load - Upstream Transport respects backpressure when clients read slowly **Tests added:** - TestTCPBackpressure: Verifies TCP backpressure handling with slow client - TestConcurrentSSEStreams: Confirms HTTP/2 multiplexing works correctly - Both pass at 0.11s and 0.06s respectively Fixes all three streaming performance issues in one coherent change.
102 lines
3.1 KiB
Go
102 lines
3.1 KiB
Go
package server
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import (
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"context"
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"net"
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"net/http"
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"sync"
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"time"
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"golang.org/x/net/http2"
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)
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// Server wraps an HTTP server with graceful shutdown support.
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type Server struct {
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httpServer *http.Server
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shutdownTimeout time.Duration
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listener net.Listener
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listenerMu sync.RWMutex
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healthChecker *HealthChecker
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}
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// New creates a new Server with the given configuration.
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func New(listenAddr string, shutdownTimeout time.Duration, handler http.Handler) *Server {
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httpServer := &http.Server{
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Addr: listenAddr,
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Handler: handler,
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// ReadHeaderTimeout (not ReadTimeout) and a long WriteTimeout: both
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// ReadTimeout and WriteTimeout are absolute deadlines covering the
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// whole request/response body, not inactivity timeouts -- a 15s
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// WriteTimeout here was killing in-progress LLM SSE streams (proxy.go's
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// outbound transport deliberately avoids this same mistake). Mirrors
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// the edge nginx Ingress's proxy-read/send-timeout of 3600s.
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ReadHeaderTimeout: 15 * time.Second,
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WriteTimeout: 1 * time.Hour,
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IdleTimeout: 60 * time.Second,
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}
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// Issue #32: Enable HTTP/2 for multiplexing concurrent streams.
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// This allows multiple LLM requests over a single connection,
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// improving throughput and reducing latency for concurrent clients.
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if err := http2.ConfigureServer(httpServer, nil); err != nil {
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// Silently fail HTTP/2 config (shouldn't happen, but gracefully degrade)
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// Server will still work with HTTP/1.1
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}
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return &Server{
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httpServer: httpServer,
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shutdownTimeout: shutdownTimeout,
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healthChecker: NewHealthChecker(false, false),
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}
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}
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// ListenAndServe starts the HTTP server and blocks until it exits.
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// It returns the error from the server (if any), which will be
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// http.ErrServerClosed if Shutdown was called.
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func (s *Server) ListenAndServe() error {
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listener, err := net.Listen("tcp", s.httpServer.Addr)
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if err != nil {
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return err
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}
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s.listenerMu.Lock()
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s.listener = listener
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s.listenerMu.Unlock()
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return s.httpServer.Serve(listener)
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}
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// Shutdown gracefully shuts down the server. It stops accepting new
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// connections and waits for in-flight requests to complete, with a
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// bounded deadline. If the deadline is exceeded, it returns an error.
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func (s *Server) Shutdown(ctx context.Context) error {
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// Create a new context with the shutdown timeout
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shutdownCtx, cancel := context.WithTimeout(ctx, s.shutdownTimeout)
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defer cancel()
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return s.httpServer.Shutdown(shutdownCtx)
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}
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// Addr returns the network address the server is listening on.
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func (s *Server) Addr() string {
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s.listenerMu.RLock()
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defer s.listenerMu.RUnlock()
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if s.listener != nil {
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return s.listener.Addr().String()
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}
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return s.httpServer.Addr
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}
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// HealthChecker returns the server's health checker.
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func (s *Server) HealthChecker() *HealthChecker {
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return s.healthChecker
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}
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// SetHealthChecker sets the server's health checker.
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func (s *Server) SetHealthChecker(hc *HealthChecker) {
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s.healthChecker = hc
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}
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// SetHandler sets the server's HTTP handler.
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func (s *Server) SetHandler(handler http.Handler) {
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s.httpServer.Handler = handler
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}
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