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connection.go
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connection.go
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// Copyright 2021 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package provider
import (
"context"
"fmt"
"github.com/juju/errors"
"k8s.io/apimachinery/pkg/labels"
k8sconstants "github.com/juju/juju/caas/kubernetes/provider/constants"
k8sproxy "github.com/juju/juju/caas/kubernetes/provider/proxy"
"github.com/juju/juju/proxy"
)
// ProxyToApplication attempts to construct a Juju proxier for use in proxying
// connections to the specified application. This assume the presence of a
// corresponding service for the application.
func (k *kubernetesClient) ProxyToApplication(appName, remotePort string) (proxy.Proxier, error) {
svc, err := findServiceForApplication(
context.TODO(),
k.client().CoreV1().Services(k.namespace),
appName,
k.IsLegacyLabels())
if err != nil {
return nil, errors.Annotatef(err, "finding service to proxy to for application %s", appName)
}
proxyName := fmt.Sprintf("%s-model-proxy", k.CurrentModel())
err = k8sproxy.EnsureProxyService(
context.Background(),
labels.Set{},
proxyName,
k.clock,
k.client().RbacV1().Roles(k.GetCurrentNamespace()),
k.client().RbacV1().RoleBindings(k.GetCurrentNamespace()),
k.client().CoreV1().ServiceAccounts(k.GetCurrentNamespace()),
k.client().CoreV1().Secrets(k.GetCurrentNamespace()),
)
if err != nil {
return nil, errors.Annotatef(err, "ensuring proxy service for application %s", appName)
}
err = k8sproxy.WaitForProxyService(
context.Background(),
proxyName,
k.client().CoreV1().ServiceAccounts(k.GetCurrentNamespace()),
)
if err != nil {
return nil, errors.Annotatef(err, "waiting for proxy service for application %s", appName)
}
config := k8sproxy.GetProxyConfig{
APIHost: k.k8sCfgUnlocked.Host,
Namespace: k.GetCurrentNamespace(),
RemotePort: remotePort,
Service: svc.Name,
}
return k8sproxy.GetProxy(
proxyName,
config,
k.client().CoreV1().ServiceAccounts(k.GetCurrentNamespace()),
k.client().CoreV1().Secrets(k.GetCurrentNamespace()),
)
}
// ConnectionProxyInfo provides the means for getting a proxier onto a Juju
// controller deployed in this provider.
func (k *kubernetesClient) ConnectionProxyInfo() (proxy.Proxier, error) {
p, err := k8sproxy.GetControllerProxy(
getBootstrapResourceName(k8sconstants.JujuControllerStackName, proxyResourceName),
k.k8sCfgUnlocked.Host,
k.client().CoreV1().ConfigMaps(k.GetCurrentNamespace()),
k.client().CoreV1().ServiceAccounts(k.GetCurrentNamespace()),
k.client().CoreV1().Secrets(k.GetCurrentNamespace()),
)
// If an error occurred return a nil to avoid converting the nil
// *Proxier into a typed nil which allows MarshalYAML to be called
// against a nil value which effectively causes a nil pointer
// dereference.
if err != nil {
return nil, errors.Trace(err)
}
return p, nil
}