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operations.go
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operations.go
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/*
* Copyright 2021 NMPolicy Authors.
*
* 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 nmpolicy
import (
"fmt"
yaml "sigs.k8s.io/yaml"
"github.com/nmstate/nmpolicy/nmpolicy/internal"
internaltypes "github.com/nmstate/nmpolicy/nmpolicy/internal/types"
"github.com/nmstate/nmpolicy/nmpolicy/types"
)
// GenerateState creates a NMPolicy state based on the given input data:
// - NMPolicy spec.
// - NMState state, representing a given current state.
// - Cache state which includes (already resolved) named captures.
//
// GenerateState returns a generated state which includes:
// - Desired State: The NMState state which has been built by the policy.
// - Cache: Named NMState states which have been resolved by the policy.
// Can be saved for use as cache data (passed as input).
// - Meta Info: Extended information about the generated state (e.g. the policy version).
//
// On failure, an error is returned.
func GenerateState(policySpec types.PolicySpec,
currentState []byte, cachedState types.CachedState) (generatedState types.GeneratedState, err error) {
internalPolicySpec, err := toInternalPolicySpec(policySpec)
if err != nil {
return generatedState, fmt.Errorf("failed converting to internal policy spec: %v", err)
}
internalCurrentState, err := toInternalNMState(currentState)
if err != nil {
return generatedState, fmt.Errorf("failed converting to internal current state: %v", err)
}
internalCachedState, err := toInternalCachedState(cachedState)
if err != nil {
return generatedState, fmt.Errorf("failed converting to internal cached state: %v", err)
}
internalGeneratedState, err := internal.GenerateState(internalPolicySpec, internalCurrentState, internalCachedState)
if err != nil {
return generatedState, err
}
generatedState, err = toGeneratedState(internalGeneratedState)
if err != nil {
return generatedState, err
}
return generatedState, nil
}
func toInternalPolicySpec(policySpec types.PolicySpec) (internaltypes.PolicySpec, error) {
internalDesiredState, err := toInternalNMState(policySpec.DesiredState)
if err != nil {
return internaltypes.PolicySpec{}, err
}
return internaltypes.PolicySpec{
DesiredState: internalDesiredState,
Capture: internaltypes.CaptureExpressions(policySpec.Capture),
}, nil
}
func toInternalNMState(nmState []byte) (internaltypes.NMState, error) {
internalNMState := internaltypes.NMState{}
if err := yaml.Unmarshal(nmState, &internalNMState); err != nil {
return nil, fmt.Errorf("failed converting to internal NMState: %w", err)
}
return internalNMState, nil
}
func toNMState(internalNMState internaltypes.NMState) ([]byte, error) {
if len(internalNMState) == 0 {
return nil, nil
}
nmState, err := yaml.Marshal(internalNMState)
if err != nil {
return nil, fmt.Errorf("failed converting from internal NMState: %w", err)
}
return nmState, nil
}
func toInternalCapturedState(capturedState types.CaptureState) (internaltypes.CapturedState, error) {
internalState, err := toInternalNMState(capturedState.State)
if err != nil {
return internaltypes.CapturedState{}, err
}
return internaltypes.CapturedState{
State: internalState,
MetaInfo: capturedState.MetaInfo,
}, nil
}
func toCapturedState(internalCapturedState internaltypes.CapturedState) (types.CaptureState, error) {
state, err := toNMState(internalCapturedState.State)
if err != nil {
return types.CaptureState{}, err
}
return types.CaptureState{
State: state,
MetaInfo: internalCapturedState.MetaInfo,
}, nil
}
func toInternalCachedState(cachedState types.CachedState) (internaltypes.CachedState, error) {
internalCachedState := internaltypes.CachedState{
CapturedStates: internaltypes.CapturedStates{},
}
for captureEntryName, capturedState := range cachedState.Capture {
internalCapturedState, err := toInternalCapturedState(capturedState)
if err != nil {
return internaltypes.CachedState{}, err
}
internalCachedState.CapturedStates[captureEntryName] = internalCapturedState
}
return internalCachedState, nil
}
func toCachedState(internalCachedState internaltypes.CachedState) (types.CachedState, error) {
if len(internalCachedState.CapturedStates) == 0 {
return types.CachedState{}, nil
}
cachedState := types.CachedState{
Capture: map[string]types.CaptureState{},
}
for captureEntryName, internalCapturedState := range internalCachedState.CapturedStates {
capturedState, err := toCapturedState(internalCapturedState)
if err != nil {
return types.CachedState{}, err
}
cachedState.Capture[captureEntryName] = capturedState
}
return cachedState, nil
}
func toGeneratedState(internalGeneratedState internaltypes.GeneratedState) (types.GeneratedState, error) {
desiredState, err := toNMState(internalGeneratedState.DesiredState)
if err != nil {
return types.GeneratedState{}, err
}
cachedState, err := toCachedState(internalGeneratedState.Cache)
if err != nil {
return types.GeneratedState{}, err
}
return types.GeneratedState{
DesiredState: desiredState,
Cache: cachedState,
}, nil
}