mirror of https://github.com/k3s-io/k3s
255 lines
9.2 KiB
Go
255 lines
9.2 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package apply
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import (
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"encoding/json"
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"fmt"
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"io"
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"time"
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"github.com/jonboulle/clockwork"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/jsonmergepatch"
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"k8s.io/apimachinery/pkg/util/mergepatch"
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"k8s.io/apimachinery/pkg/util/strategicpatch"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/cli-runtime/pkg/resource"
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"k8s.io/client-go/dynamic"
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oapi "k8s.io/kube-openapi/pkg/util/proto"
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cmdutil "k8s.io/kubectl/pkg/cmd/util"
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"k8s.io/kubectl/pkg/scheme"
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"k8s.io/kubectl/pkg/util"
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"k8s.io/kubectl/pkg/util/openapi"
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)
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const (
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// maxPatchRetry is the maximum number of conflicts retry for during a patch operation before returning failure
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maxPatchRetry = 5
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// backOffPeriod is the period to back off when apply patch results in error.
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backOffPeriod = 1 * time.Second
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// how many times we can retry before back off
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triesBeforeBackOff = 1
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)
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// Patcher defines options to patch OpenAPI objects.
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type Patcher struct {
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Mapping *meta.RESTMapping
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Helper *resource.Helper
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DynamicClient dynamic.Interface
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Overwrite bool
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BackOff clockwork.Clock
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Force bool
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Cascade bool
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Timeout time.Duration
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GracePeriod int
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ServerDryRun bool
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// If set, forces the patch against a specific resourceVersion
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ResourceVersion *string
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// Number of retries to make if the patch fails with conflict
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Retries int
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OpenapiSchema openapi.Resources
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}
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func newPatcher(o *ApplyOptions, info *resource.Info) (*Patcher, error) {
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var openapiSchema openapi.Resources
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if o.OpenAPIPatch {
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openapiSchema = o.OpenAPISchema
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}
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return &Patcher{
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Mapping: info.Mapping,
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Helper: resource.NewHelper(info.Client, info.Mapping),
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DynamicClient: o.DynamicClient,
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Overwrite: o.Overwrite,
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BackOff: clockwork.NewRealClock(),
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Force: o.DeleteOptions.ForceDeletion,
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Cascade: o.DeleteOptions.Cascade,
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Timeout: o.DeleteOptions.Timeout,
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GracePeriod: o.DeleteOptions.GracePeriod,
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ServerDryRun: o.DryRunStrategy == cmdutil.DryRunServer,
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OpenapiSchema: openapiSchema,
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Retries: maxPatchRetry,
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}, nil
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}
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func (p *Patcher) delete(namespace, name string) error {
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return runDelete(namespace, name, p.Mapping, p.DynamicClient, p.Cascade, p.GracePeriod, p.ServerDryRun)
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}
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func (p *Patcher) patchSimple(obj runtime.Object, modified []byte, source, namespace, name string, errOut io.Writer) ([]byte, runtime.Object, error) {
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// Serialize the current configuration of the object from the server.
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current, err := runtime.Encode(unstructured.UnstructuredJSONScheme, obj)
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if err != nil {
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return nil, nil, cmdutil.AddSourceToErr(fmt.Sprintf("serializing current configuration from:\n%v\nfor:", obj), source, err)
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}
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// Retrieve the original configuration of the object from the annotation.
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original, err := util.GetOriginalConfiguration(obj)
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if err != nil {
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return nil, nil, cmdutil.AddSourceToErr(fmt.Sprintf("retrieving original configuration from:\n%v\nfor:", obj), source, err)
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}
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var patchType types.PatchType
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var patch []byte
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var lookupPatchMeta strategicpatch.LookupPatchMeta
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var schema oapi.Schema
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createPatchErrFormat := "creating patch with:\noriginal:\n%s\nmodified:\n%s\ncurrent:\n%s\nfor:"
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// Create the versioned struct from the type defined in the restmapping
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// (which is the API version we'll be submitting the patch to)
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versionedObject, err := scheme.Scheme.New(p.Mapping.GroupVersionKind)
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switch {
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case runtime.IsNotRegisteredError(err):
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// fall back to generic JSON merge patch
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patchType = types.MergePatchType
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preconditions := []mergepatch.PreconditionFunc{mergepatch.RequireKeyUnchanged("apiVersion"),
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mergepatch.RequireKeyUnchanged("kind"), mergepatch.RequireMetadataKeyUnchanged("name")}
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patch, err = jsonmergepatch.CreateThreeWayJSONMergePatch(original, modified, current, preconditions...)
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if err != nil {
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if mergepatch.IsPreconditionFailed(err) {
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return nil, nil, fmt.Errorf("%s", "At least one of apiVersion, kind and name was changed")
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}
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return nil, nil, cmdutil.AddSourceToErr(fmt.Sprintf(createPatchErrFormat, original, modified, current), source, err)
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}
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case err != nil:
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return nil, nil, cmdutil.AddSourceToErr(fmt.Sprintf("getting instance of versioned object for %v:", p.Mapping.GroupVersionKind), source, err)
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case err == nil:
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// Compute a three way strategic merge patch to send to server.
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patchType = types.StrategicMergePatchType
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// Try to use openapi first if the openapi spec is available and can successfully calculate the patch.
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// Otherwise, fall back to baked-in types.
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if p.OpenapiSchema != nil {
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if schema = p.OpenapiSchema.LookupResource(p.Mapping.GroupVersionKind); schema != nil {
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lookupPatchMeta = strategicpatch.PatchMetaFromOpenAPI{Schema: schema}
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if openapiPatch, err := strategicpatch.CreateThreeWayMergePatch(original, modified, current, lookupPatchMeta, p.Overwrite); err != nil {
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fmt.Fprintf(errOut, "warning: error calculating patch from openapi spec: %v\n", err)
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} else {
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patchType = types.StrategicMergePatchType
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patch = openapiPatch
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}
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}
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}
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if patch == nil {
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lookupPatchMeta, err = strategicpatch.NewPatchMetaFromStruct(versionedObject)
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if err != nil {
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return nil, nil, cmdutil.AddSourceToErr(fmt.Sprintf(createPatchErrFormat, original, modified, current), source, err)
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}
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patch, err = strategicpatch.CreateThreeWayMergePatch(original, modified, current, lookupPatchMeta, p.Overwrite)
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if err != nil {
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return nil, nil, cmdutil.AddSourceToErr(fmt.Sprintf(createPatchErrFormat, original, modified, current), source, err)
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}
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}
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}
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if string(patch) == "{}" {
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return patch, obj, nil
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}
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if p.ResourceVersion != nil {
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patch, err = addResourceVersion(patch, *p.ResourceVersion)
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if err != nil {
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return nil, nil, cmdutil.AddSourceToErr("Failed to insert resourceVersion in patch", source, err)
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}
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}
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patchedObj, err := p.Helper.DryRun(p.ServerDryRun).Patch(namespace, name, patchType, patch, nil)
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return patch, patchedObj, err
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}
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// Patch tries to patch an OpenAPI resource. On success, returns the merge patch as well
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// the final patched object. On failure, returns an error.
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func (p *Patcher) Patch(current runtime.Object, modified []byte, source, namespace, name string, errOut io.Writer) ([]byte, runtime.Object, error) {
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var getErr error
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patchBytes, patchObject, err := p.patchSimple(current, modified, source, namespace, name, errOut)
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if p.Retries == 0 {
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p.Retries = maxPatchRetry
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}
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for i := 1; i <= p.Retries && errors.IsConflict(err); i++ {
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if i > triesBeforeBackOff {
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p.BackOff.Sleep(backOffPeriod)
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}
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current, getErr = p.Helper.Get(namespace, name, false)
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if getErr != nil {
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return nil, nil, getErr
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}
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patchBytes, patchObject, err = p.patchSimple(current, modified, source, namespace, name, errOut)
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}
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if err != nil && (errors.IsConflict(err) || errors.IsInvalid(err)) && p.Force {
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patchBytes, patchObject, err = p.deleteAndCreate(current, modified, namespace, name)
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}
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return patchBytes, patchObject, err
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}
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func (p *Patcher) deleteAndCreate(original runtime.Object, modified []byte, namespace, name string) ([]byte, runtime.Object, error) {
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if err := p.delete(namespace, name); err != nil {
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return modified, nil, err
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}
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// TODO: use wait
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if err := wait.PollImmediate(1*time.Second, p.Timeout, func() (bool, error) {
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if _, err := p.Helper.Get(namespace, name, false); !errors.IsNotFound(err) {
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return false, err
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}
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return true, nil
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}); err != nil {
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return modified, nil, err
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}
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versionedObject, _, err := unstructured.UnstructuredJSONScheme.Decode(modified, nil, nil)
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if err != nil {
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return modified, nil, err
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}
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createdObject, err := p.Helper.DryRun(p.ServerDryRun).Create(namespace, true, versionedObject)
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if err != nil {
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// restore the original object if we fail to create the new one
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// but still propagate and advertise error to user
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recreated, recreateErr := p.Helper.DryRun(p.ServerDryRun).Create(namespace, true, original)
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if recreateErr != nil {
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err = fmt.Errorf("An error occurred force-replacing the existing object with the newly provided one:\n\n%v.\n\nAdditionally, an error occurred attempting to restore the original object:\n\n%v", err, recreateErr)
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} else {
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createdObject = recreated
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}
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}
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return modified, createdObject, err
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}
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func addResourceVersion(patch []byte, rv string) ([]byte, error) {
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var patchMap map[string]interface{}
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err := json.Unmarshal(patch, &patchMap)
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if err != nil {
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return nil, err
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}
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u := unstructured.Unstructured{Object: patchMap}
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a, err := meta.Accessor(&u)
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if err != nil {
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return nil, err
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}
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a.SetResourceVersion(rv)
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return json.Marshal(patchMap)
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}
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