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Remove timeout/interval from the ACME Provider

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This commit is contained in:
Jean-Baptiste Doumenjou 2019-05-10 09:58:05 +02:00 • committed by Traefiker Bot
parent 8f23243cb8
commit 17141b3589
3 changed files with 62 additions and 200 deletions
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90
pkg/provider/acme/provider.go
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@ -14,7 +14,6 @@ import (
"sync"
"time"
"github.com/cenkalti/backoff"
"github.com/containous/flaeg/parse"
"github.com/containous/traefik/pkg/config"
"github.com/containous/traefik/pkg/log"
@ -66,9 +65,6 @@ type DNSChallenge struct {
DelayBeforeCheck parse.Duration `description:"Assume DNS propagates after a delay in seconds rather than finding and querying nameservers."`
Resolvers types.DNSResolvers `description:"Use following DNS servers to resolve the FQDN authority."`
DisablePropagationCheck bool `description:"Disable the DNS propagation checks before notifying ACME that the DNS challenge is ready. [not recommended]"`
preCheckTimeout time.Duration
preCheckInterval time.Duration
}
// HTTPChallenge contains HTTP challenge Configuration
@ -303,15 +299,6 @@ func (p *Provider) getClient() (*lego.Client, error) {
return nil, err
}
// Same default values than LEGO
p.DNSChallenge.preCheckTimeout = 60 * time.Second
p.DNSChallenge.preCheckInterval = 2 * time.Second
// Set the precheck timeout into the DNSChallenge provider
if challengeProviderTimeout, ok := provider.(challenge.ProviderTimeout); ok {
p.DNSChallenge.preCheckTimeout, p.DNSChallenge.preCheckInterval = challengeProviderTimeout.Timeout()
}
case p.HTTPChallenge != nil && len(p.HTTPChallenge.EntryPoint) > 0:
logger.Debug("Using HTTP Challenge provider.")
@ -440,19 +427,13 @@ func (p *Provider) resolveCertificate(ctx context.Context, domain types.Domain,
return nil, fmt.Errorf("cannot get ACME client %v", err)
}
var cert *certificate.Resource
bundle := true
if p.useCertificateWithRetry(uncheckedDomains) {
cert, err = obtainCertificateWithRetry(ctx, domains, client, p.DNSChallenge.preCheckTimeout, p.DNSChallenge.preCheckInterval, bundle)
} else {
request := certificate.ObtainRequest{
Domains: domains,
Bundle: bundle,
MustStaple: oscpMustStaple,
}
cert, err = client.Certificate.Obtain(request)
request := certificate.ObtainRequest{
Domains: domains,
Bundle: true,
MustStaple: oscpMustStaple,
}
cert, err := client.Certificate.Obtain(request)
if err != nil {
return nil, fmt.Errorf("unable to generate a certificate for the domains %v: %v", uncheckedDomains, err)
}
@ -493,67 +474,6 @@ func (p *Provider) addResolvingDomains(resolvingDomains []string) {
}
}
func (p *Provider) useCertificateWithRetry(domains []string) bool {
// Check if we can use the retry mechanism only if we use the DNS Challenge and if is there are at least 2 domains to check
if p.DNSChallenge != nil && len(domains) > 1 {
rootDomain := ""
for _, searchWildcardDomain := range domains {
// Search a wildcard domain if not already found
if len(rootDomain) == 0 && strings.HasPrefix(searchWildcardDomain, "*.") {
rootDomain = strings.TrimPrefix(searchWildcardDomain, "*.")
if len(rootDomain) > 0 {
// Look for a root domain which matches the wildcard domain
for _, searchRootDomain := range domains {
if rootDomain == searchRootDomain {
// If the domains list contains a wildcard domain and its root domain, we can use the retry mechanism to obtain the certificate
return true
}
}
}
// There is only one wildcard domain in the slice, if its root domain has not been found, the retry mechanism does not have to be used
return false
}
}
}
return false
}
func obtainCertificateWithRetry(ctx context.Context, domains []string, client *lego.Client, timeout, interval time.Duration, bundle bool) (*certificate.Resource, error) {
logger := log.FromContext(ctx)
var cert *certificate.Resource
var err error
operation := func() error {
request := certificate.ObtainRequest{
Domains: domains,
Bundle: bundle,
MustStaple: oscpMustStaple,
}
cert, err = client.Certificate.Obtain(request)
return err
}
notify := func(err error, time time.Duration) {
logger.Errorf("Error obtaining certificate retrying in %s", time)
}
// Define a retry backOff to let LEGO tries twice to obtain a certificate for both wildcard and root domain
ebo := backoff.NewExponentialBackOff()
ebo.MaxElapsedTime = 2 * timeout
ebo.MaxInterval = interval
rbo := backoff.WithMaxRetries(ebo, 2)
err = backoff.RetryNotify(safe.OperationWithRecover(operation), rbo, notify)
if err != nil {
logger.Errorf("Error obtaining certificate: %v", err)
return nil, err
}
return cert, nil
}
func (p *Provider) addCertificateForDomain(domain types.Domain, certificate []byte, key []byte) {
p.certsChan <- &Certificate{Certificate: certificate, Key: key, Domain: domain}
}