frostfs-http-gw/server.go

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package main
import (
"context"
"crypto/tls"
"errors"
"fmt"
"net"
"sync"
)
type (
ServerInfo struct {
Address string
TLS ServerTLSInfo
}
ServerTLSInfo struct {
Enabled bool
CertFile string
KeyFile string
}
Server interface {
Address() string
Listener() net.Listener
UpdateCert(certFile, keyFile string) error
}
server struct {
address string
listener net.Listener
tlsProvider *certProvider
}
certProvider struct {
Enabled bool
mu sync.RWMutex
certPath string
keyPath string
cert *tls.Certificate
}
)
func (s *server) Address() string {
return s.address
}
func (s *server) Listener() net.Listener {
return s.listener
}
func (s *server) UpdateCert(certFile, keyFile string) error {
return s.tlsProvider.UpdateCert(certFile, keyFile)
}
func newServer(ctx context.Context, serverInfo ServerInfo) (*server, error) {
var lic net.ListenConfig
ln, err := lic.Listen(ctx, "tcp", serverInfo.Address)
if err != nil {
return nil, fmt.Errorf("could not prepare listener: %w", err)
}
tlsProvider := &certProvider{
Enabled: serverInfo.TLS.Enabled,
}
if serverInfo.TLS.Enabled {
if err = tlsProvider.UpdateCert(serverInfo.TLS.CertFile, serverInfo.TLS.KeyFile); err != nil {
return nil, fmt.Errorf("failed to update cert: %w", err)
}
ln = tls.NewListener(ln, &tls.Config{
GetCertificate: tlsProvider.GetCertificate,
})
}
return &server{
address: serverInfo.Address,
listener: ln,
tlsProvider: tlsProvider,
}, nil
}
func (p *certProvider) GetCertificate(*tls.ClientHelloInfo) (*tls.Certificate, error) {
if !p.Enabled {
return nil, errors.New("cert provider: disabled")
}
p.mu.RLock()
defer p.mu.RUnlock()
return p.cert, nil
}
func (p *certProvider) UpdateCert(certPath, keyPath string) error {
if !p.Enabled {
return fmt.Errorf("tls disabled")
}
cert, err := tls.LoadX509KeyPair(certPath, keyPath)
if err != nil {
return fmt.Errorf("cannot load TLS key pair from certFile '%s' and keyFile '%s': %w", certPath, keyPath, err)
}
p.mu.Lock()
p.certPath = certPath
p.keyPath = keyPath
p.cert = &cert
p.mu.Unlock()
return nil
}
func (p *certProvider) FilePaths() (string, string) {
if !p.Enabled {
return "", ""
}
p.mu.RLock()
defer p.mu.RUnlock()
return p.certPath, p.keyPath
}