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perf(cloudflared): reuse memory from buffer pool to get better throughput (#161)

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* perf(cloudflared): reuse memory from buffer pool to get better throughput

https://github.com/cloudflare/cloudflared/issues/160
pull/178/head
Rueian 3 years ago committed by GitHub
parent 6488843ac4
commit 464bb53049
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 64 additions and 12 deletions
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29
buffer/pool.go
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@ -0,0 +1,29 @@
package buffer
import (
"sync"
)
type Pool struct {
// A Pool must not be copied after first use.
// https://golang.org/pkg/sync/#Pool
buffers sync.Pool
}
func NewPool(bufferSize int) *Pool {
return &Pool{
buffers: sync.Pool{
New: func() interface{} {
return make([]byte, bufferSize)
},
},
}
}
func (p *Pool) Get() []byte {
return p.buffers.Get().([]byte)
}
func (p *Pool) Put(buf []byte) {
p.buffers.Put(buf)
}

10
origin/supervisor.go
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@ -11,6 +11,7 @@ import (
"github.com/google/uuid"
"github.com/sirupsen/logrus"
"github.com/cloudflare/cloudflared/buffer"
"github.com/cloudflare/cloudflared/connection"
"github.com/cloudflare/cloudflared/edgediscovery"
"github.com/cloudflare/cloudflared/h2mux"
@ -62,6 +63,8 @@ type Supervisor struct {
eventDigestLock *sync.RWMutex
eventDigest []byte
bufferPool *buffer.Pool
}
type resolveResult struct {
@ -96,6 +99,7 @@ func NewSupervisor(config *TunnelConfig, u uuid.UUID) (*Supervisor, error) {
logger: config.Logger.WithField("subsystem", "supervisor"),
jwtLock: &sync.RWMutex{},
eventDigestLock: &sync.RWMutex{},
bufferPool: buffer.NewPool(512 * 1024),
}, nil
}
@ -230,7 +234,7 @@ func (s *Supervisor) startFirstTunnel(ctx context.Context, connectedSignal *sign
return
}
err = ServeTunnelLoop(ctx, s, s.config, addr, thisConnID, connectedSignal, s.cloudflaredUUID)
err = ServeTunnelLoop(ctx, s, s.config, addr, thisConnID, connectedSignal, s.cloudflaredUUID, s.bufferPool)
// If the first tunnel disconnects, keep restarting it.
edgeErrors := 0
for s.unusedIPs() {
@ -253,7 +257,7 @@ func (s *Supervisor) startFirstTunnel(ctx context.Context, connectedSignal *sign
return
}
}
err = ServeTunnelLoop(ctx, s, s.config, addr, thisConnID, connectedSignal, s.cloudflaredUUID)
err = ServeTunnelLoop(ctx, s, s.config, addr, thisConnID, connectedSignal, s.cloudflaredUUID, s.bufferPool)
}
}
@ -272,7 +276,7 @@ func (s *Supervisor) startTunnel(ctx context.Context, index int, connectedSignal
if err != nil {
return
}
err = ServeTunnelLoop(ctx, s, s.config, addr, uint8(index), connectedSignal, s.cloudflaredUUID)
err = ServeTunnelLoop(ctx, s, s.config, addr, uint8(index), connectedSignal, s.cloudflaredUUID, s.bufferPool)
}
func (s *Supervisor) newConnectedTunnelSignal(index int) *signal.Signal {

14
origin/tunnel.go
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@ -20,6 +20,7 @@ import (
log "github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"github.com/cloudflare/cloudflared/buffer"
"github.com/cloudflare/cloudflared/cmd/cloudflared/buildinfo"
"github.com/cloudflare/cloudflared/connection"
"github.com/cloudflare/cloudflared/h2mux"
@ -178,6 +179,7 @@ func ServeTunnelLoop(ctx context.Context,
connectionID uint8,
connectedSignal *signal.Signal,
u uuid.UUID,
bufferPool *buffer.Pool,
) error {
connectionLogger := config.Logger.WithField("connectionID", connectionID)
config.Metrics.incrementHaConnections()
@ -201,6 +203,7 @@ func ServeTunnelLoop(ctx context.Context,
connectedFuse,
&backoff,
u,
bufferPool,
)
if recoverable {
if duration, ok := backoff.GetBackoffDuration(ctx); ok {
@ -223,6 +226,7 @@ func ServeTunnel(
connectedFuse *h2mux.BooleanFuse,
backoff *BackoffHandler,
u uuid.UUID,
bufferPool *buffer.Pool,
) (err error, recoverable bool) {
// Treat panics as recoverable errors
defer func() {
@ -243,7 +247,7 @@ func ServeTunnel(
tags["ha"] = connectionTag
// Returns error from parsing the origin URL or handshake errors
handler, originLocalIP, err := NewTunnelHandler(ctx, config, addr, connectionID)
handler, originLocalIP, err := NewTunnelHandler(ctx, config, addr, connectionID, bufferPool)
if err != nil {
errLog := logger.WithError(err)
switch err.(type) {
@ -500,6 +504,8 @@ type TunnelHandler struct {
connectionID string
logger *log.Logger
noChunkedEncoding bool
bufferPool *buffer.Pool
}
// NewTunnelHandler returns a TunnelHandler, origin LAN IP and error
@ -507,6 +513,7 @@ func NewTunnelHandler(ctx context.Context,
config *TunnelConfig,
addr *net.TCPAddr,
connectionID uint8,
bufferPool *buffer.Pool,
) (*TunnelHandler, string, error) {
originURL, err := validation.ValidateUrl(config.OriginUrl)
if err != nil {
@ -522,6 +529,7 @@ func NewTunnelHandler(ctx context.Context,
connectionID: uint8ToString(connectionID),
logger: config.Logger,
noChunkedEncoding: config.NoChunkedEncoding,
bufferPool: bufferPool,
}
if h.httpClient == nil {
h.httpClient = http.DefaultTransport
@ -642,7 +650,9 @@ func (h *TunnelHandler) serveHTTP(stream *h2mux.MuxedStream, req *http.Request)
} else {
// Use CopyBuffer, because Copy only allocates a 32KiB buffer, and cross-stream
// compression generates dictionary on first write
io.CopyBuffer(stream, response.Body, make([]byte, 512*1024))
buf := h.bufferPool.Get()
defer h.bufferPool.Put(buf)
io.CopyBuffer(stream, response.Body, buf)
}
return response, nil
}

23
originservice/originservice.go
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@ -12,6 +12,7 @@ import (
"strconv"
"strings"
"github.com/cloudflare/cloudflared/buffer"
"github.com/cloudflare/cloudflared/h2mux"
"github.com/cloudflare/cloudflared/hello"
"github.com/cloudflare/cloudflared/log"
@ -33,6 +34,7 @@ type HTTPService struct {
client http.RoundTripper
originURL *url.URL
chunkedEncoding bool
bufferPool *buffer.Pool
}
func NewHTTPService(transport http.RoundTripper, url *url.URL, chunkedEncoding bool) OriginService {
@ -40,6 +42,7 @@ func NewHTTPService(transport http.RoundTripper, url *url.URL, chunkedEncoding b
client: transport,
originURL: url,
chunkedEncoding: chunkedEncoding,
bufferPool: buffer.NewPool(512 * 1024),
}
}
@ -71,7 +74,9 @@ func (hc *HTTPService) Proxy(stream *h2mux.MuxedStream, req *http.Request) (*htt
} else {
// Use CopyBuffer, because Copy only allocates a 32KiB buffer, and cross-stream
// compression generates dictionary on first write
io.CopyBuffer(stream, resp.Body, make([]byte, 512*1024))
buf := hc.bufferPool.Get()
defer hc.bufferPool.Put(buf)
io.CopyBuffer(stream, resp.Body, buf)
}
return resp, nil
}
@ -142,10 +147,11 @@ func (wsc *WebsocketService) Shutdown() {
// HelloWorldService talks to the hello world example origin
type HelloWorldService struct {
client http.RoundTripper
listener net.Listener
originURL *url.URL
shutdownC chan struct{}
client http.RoundTripper
listener net.Listener
originURL *url.URL
shutdownC chan struct{}
bufferPool *buffer.Pool
}
func NewHelloWorldService(transport http.RoundTripper) (OriginService, error) {
@ -164,7 +170,8 @@ func NewHelloWorldService(transport http.RoundTripper) (OriginService, error) {
Scheme: "https",
Host: listener.Addr().String(),
},
shutdownC: shutdownC,
shutdownC: shutdownC,
bufferPool: buffer.NewPool(512 * 1024),
}, nil
}
@ -184,7 +191,9 @@ func (hwc *HelloWorldService) Proxy(stream *h2mux.MuxedStream, req *http.Request
// Use CopyBuffer, because Copy only allocates a 32KiB buffer, and cross-stream
// compression generates dictionary on first write
io.CopyBuffer(stream, resp.Body, make([]byte, 512*1024))
buf := hwc.bufferPool.Get()
defer hwc.bufferPool.Put(buf)
io.CopyBuffer(stream, resp.Body, buf)
return resp, nil
}

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