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systemnetworkpolicies_conversion.go
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systemnetworkpolicies_conversion.go
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// Copyright (c) 2017 Tigera, Inc. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package resources
import (
"fmt"
"strings"
log "github.com/Sirupsen/logrus"
"github.com/projectcalico/libcalico-go/lib/api"
"github.com/projectcalico/libcalico-go/lib/backend/k8s/thirdparty"
"github.com/projectcalico/libcalico-go/lib/backend/model"
"github.com/projectcalico/libcalico-go/lib/converter"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
// ThirdPartyToSystemNetworkPolicy takes a Kubernetes ThirdPartyResource representation
// of a Calico Policy and returns the equivalent SystemNetworkPolicy object.
func ThirdPartyToSystemNetworkPolicy(t *thirdparty.SystemNetworkPolicy) *model.KVPair {
// Since we are using the Calico API Spec definition to store the Calico
// Policy, use the client conversion helper to convert between KV and API.
policyName := fmt.Sprintf("%s%s", SystemNetworkPolicyNamePrefix, t.Metadata.Name)
r := api.Policy{
Metadata: api.PolicyMetadata{
Name: policyName,
},
Spec: t.Spec,
}
kvp := converter.PolicyConverter{}.ConvertAPIToKVPair(r)
kvp.Revision = t.Metadata.ResourceVersion
return kvp
}
// SystemNetworkPolicyToThirdParty takes a Calico Policy and returns the equivalent
// ThirdPartyResource representation.
func SystemNetworkPolicyToThirdParty(kvp *model.KVPair) *thirdparty.SystemNetworkPolicy {
r := converter.PolicyConverter{}.ConvertKVPairToAPI(kvp)
tprName := systemNetworkPolicyTPRName(kvp.Key)
tpr := thirdparty.SystemNetworkPolicy{
Metadata: metav1.ObjectMeta{
Name: tprName,
},
Spec: r.(*api.Policy).Spec,
}
if kvp.Revision != nil {
tpr.Metadata.ResourceVersion = kvp.Revision.(string)
}
return &tpr
}
// systemNetworkPolicyTPRName converts a Policy (specifically a System Network Policy)
// name to a TPR name.
func systemNetworkPolicyTPRName(key model.Key) string {
// The name should be policed before we get here.
pk := key.(model.PolicyKey)
if !strings.HasPrefix(pk.Name, SystemNetworkPolicyNamePrefix) {
log.WithField("Key", key).Fatal("System Network Policy name is not correctly namespaced")
}
// Trim the namespace and ensure lowercase.
return strings.ToLower(strings.TrimPrefix(pk.Name, SystemNetworkPolicyNamePrefix))
}