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package main
import (
"crypto/tls"
"sync"
)
type CertStorage struct {
certs sync.Map
}
func (tcs *CertStorage) Fetch(hostname string, gen func() (*tls.Certificate, error)) (*tls.Certificate, error) {
var cert tls.Certificate
icert, ok := tcs.certs.Load(hostname)
if ok {
cert = icert.(tls.Certificate)
} else {
certp, err := gen()
if err != nil {
return nil, err
}
// store as concrete implementation
cert = *certp
tcs.certs.Store(hostname, cert)
}
return &cert, nil
}
func NewCertStorage() *CertStorage {
tcs := &CertStorage{}
tcs.certs = sync.Map{}
return tcs
}
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