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perf(dot): implement connection pooling for improved performance

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Implement TCP/TLS connection pooling for DoT resolver to match DoQ
performance. Previously, DoT created a new TCP/TLS connection for every
DNS query, incurring significant TLS handshake overhead. Now connections are
reused across queries, eliminating this overhead for subsequent requests.

The implementation follows the same pattern as DoQ, using parallel dialing
and connection pooling to achieve comparable performance characteristics.
This commit is contained in:
Cuong Manh Le
2026-01-08 20:00:15 +07:00
committed by Cuong Manh Le
parent 2e8a0f00a0
commit acbebcf7c2
6 changed files with 343 additions and 43 deletions
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config.go
+16 -4
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@@ -282,6 +282,9 @@ type UpstreamConfig struct {
doqConnPool *doqConnPool
doqConnPool4 *doqConnPool
doqConnPool6 *doqConnPool
dotClientPool *dotConnPool
dotClientPool4 *dotConnPool
dotClientPool6 *dotConnPool
certPool *x509.CertPool
u *url.URL
fallbackOnce sync.Once
@@ -496,7 +499,7 @@ func (uc *UpstreamConfig) SetupBootstrapIP() {
// ReBootstrap re-setup the bootstrap IP and the transport.
func (uc *UpstreamConfig) ReBootstrap() {
switch uc.Type {
case ResolverTypeDOH, ResolverTypeDOH3, ResolverTypeDOQ:
case ResolverTypeDOH, ResolverTypeDOH3, ResolverTypeDOQ, ResolverTypeDOT:
default:
return
}
@@ -508,11 +511,11 @@ func (uc *UpstreamConfig) ReBootstrap() {
})
}
// SetupTransport initializes the network transport used to connect to upstream server.
// For now, only DoH upstream is supported.
// SetupTransport initializes the network transport used to connect to upstream servers.
// For now, DoH/DoH3/DoQ/DoT upstreams are supported.
func (uc *UpstreamConfig) SetupTransport() {
switch uc.Type {
case ResolverTypeDOH, ResolverTypeDOH3, ResolverTypeDOQ:
case ResolverTypeDOH, ResolverTypeDOH3, ResolverTypeDOQ, ResolverTypeDOT:
default:
return
}
@@ -523,21 +526,26 @@ func (uc *UpstreamConfig) SetupTransport() {
case IpStackV6:
ips = uc.bootstrapIPs6
}
uc.transport = uc.newDOHTransport(ips)
uc.http3RoundTripper = uc.newDOH3Transport(ips)
uc.doqConnPool = uc.newDOQConnPool(ips)
uc.dotClientPool = uc.newDOTClientPool(ips)
if uc.IPStack == IpStackSplit {
uc.transport4 = uc.newDOHTransport(uc.bootstrapIPs4)
uc.http3RoundTripper4 = uc.newDOH3Transport(uc.bootstrapIPs4)
uc.doqConnPool4 = uc.newDOQConnPool(uc.bootstrapIPs4)
uc.dotClientPool4 = uc.newDOTClientPool(uc.bootstrapIPs4)
if HasIPv6() {
uc.transport6 = uc.newDOHTransport(uc.bootstrapIPs6)
uc.http3RoundTripper6 = uc.newDOH3Transport(uc.bootstrapIPs6)
uc.doqConnPool6 = uc.newDOQConnPool(uc.bootstrapIPs6)
uc.dotClientPool6 = uc.newDOTClientPool(uc.bootstrapIPs6)
} else {
uc.transport6 = uc.transport4
uc.http3RoundTripper6 = uc.http3RoundTripper4
uc.doqConnPool6 = uc.doqConnPool4
uc.dotClientPool6 = uc.dotClientPool4
}
}
}
@@ -656,6 +664,10 @@ func (uc *UpstreamConfig) ping() error {
// For DoQ, we just ensure transport is set up by calling doqTransport
// DoQ doesn't use HTTP, so we can't ping it the same way
_ = uc.doqTransport(typ)
case ResolverTypeDOT:
// For DoT, we just ensure transport is set up by calling dotTransport
// DoT doesn't use HTTP, so we can't ping it the same way
_ = uc.dotTransport(typ)
}
}