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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
2026-03-05 16:52:15 +07:00
committed by Cuong Manh Le
parent 8dd90cb354
commit f859c52916
6 changed files with 339 additions and 24 deletions
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config.go
+14 -3
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@@ -288,6 +288,9 @@ type UpstreamConfig struct {
doqConnPool *doqConnPool
doqConnPool4 *doqConnPool
doqConnPool6 *doqConnPool
dotClientPool *dotConnPool
dotClientPool4 *dotConnPool
dotClientPool6 *dotConnPool
certPool *x509.CertPool
u *url.URL
fallbackOnce sync.Once
@@ -510,7 +513,7 @@ func (uc *UpstreamConfig) SetupBootstrapIP(ctx context.Context) {
// ReBootstrap re-setup the bootstrap IP and the transport.
func (uc *UpstreamConfig) ReBootstrap(ctx context.Context) {
switch uc.Type {
case ResolverTypeDOH, ResolverTypeDOH3, ResolverTypeDOQ:
case ResolverTypeDOH, ResolverTypeDOH3, ResolverTypeDOQ, ResolverTypeDOT:
default:
return
}
@@ -524,10 +527,10 @@ func (uc *UpstreamConfig) ReBootstrap(ctx context.Context) {
}
// SetupTransport initializes the network transport used to connect to upstream servers.
// For now, DoH/DoH3/DoQ upstreams are supported.
// For now, DoH/DoH3/DoQ/DoT upstreams are supported.
func (uc *UpstreamConfig) SetupTransport(ctx context.Context) {
switch uc.Type {
case ResolverTypeDOH, ResolverTypeDOH3, ResolverTypeDOQ:
case ResolverTypeDOH, ResolverTypeDOH3, ResolverTypeDOQ, ResolverTypeDOT:
default:
return
}
@@ -541,18 +544,22 @@ func (uc *UpstreamConfig) SetupTransport(ctx context.Context) {
uc.transport = uc.newDOHTransport(ctx, ips)
uc.http3RoundTripper = uc.newDOH3Transport(ctx, ips)
uc.doqConnPool = uc.newDOQConnPool(ctx, ips)
uc.dotClientPool = uc.newDOTClientPool(ctx, ips)
if uc.IPStack == IpStackSplit {
uc.transport4 = uc.newDOHTransport(ctx, uc.bootstrapIPs4)
uc.http3RoundTripper4 = uc.newDOH3Transport(ctx, uc.bootstrapIPs4)
uc.doqConnPool4 = uc.newDOQConnPool(ctx, uc.bootstrapIPs4)
uc.dotClientPool4 = uc.newDOTClientPool(ctx, uc.bootstrapIPs4)
if HasIPv6(ctx) {
uc.transport6 = uc.newDOHTransport(ctx, uc.bootstrapIPs6)
uc.http3RoundTripper6 = uc.newDOH3Transport(ctx, uc.bootstrapIPs6)
uc.doqConnPool6 = uc.newDOQConnPool(ctx, uc.bootstrapIPs6)
uc.dotClientPool6 = uc.newDOTClientPool(ctx, uc.bootstrapIPs6)
} else {
uc.transport6 = uc.transport4
uc.http3RoundTripper6 = uc.http3RoundTripper4
uc.doqConnPool6 = uc.doqConnPool4
uc.dotClientPool6 = uc.dotClientPool4
}
}
}
@@ -674,6 +681,10 @@ func (uc *UpstreamConfig) ping(ctx context.Context) 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(ctx, 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(ctx, typ)
}
}