mirror of
https://github.com/ceph/ceph-csi.git
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274 lines
8.5 KiB
Go
274 lines
8.5 KiB
Go
/*
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Copyright 2016 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 kubectl
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import (
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"fmt"
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"io/ioutil"
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"os"
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"path"
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"strings"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/util/validation"
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"k8s.io/kubernetes/pkg/kubectl/util"
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"k8s.io/kubernetes/pkg/kubectl/util/hash"
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)
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// ConfigMapGeneratorV1 supports stable generation of a configMap.
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type ConfigMapGeneratorV1 struct {
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// Name of configMap (required)
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Name string
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// Type of configMap (optional)
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Type string
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// FileSources to derive the configMap from (optional)
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FileSources []string
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// LiteralSources to derive the configMap from (optional)
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LiteralSources []string
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// EnvFileSource to derive the configMap from (optional)
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EnvFileSource string
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// AppendHash; if true, derive a hash from the ConfigMap and append it to the name
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AppendHash bool
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}
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// Ensure it supports the generator pattern that uses parameter injection.
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var _ Generator = &ConfigMapGeneratorV1{}
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// Ensure it supports the generator pattern that uses parameters specified during construction.
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var _ StructuredGenerator = &ConfigMapGeneratorV1{}
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// Generate returns a configMap using the specified parameters.
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func (s ConfigMapGeneratorV1) Generate(genericParams map[string]interface{}) (runtime.Object, error) {
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err := ValidateParams(s.ParamNames(), genericParams)
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if err != nil {
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return nil, err
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}
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delegate := &ConfigMapGeneratorV1{}
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fromFileStrings, found := genericParams["from-file"]
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if found {
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fromFileArray, isArray := fromFileStrings.([]string)
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if !isArray {
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return nil, fmt.Errorf("expected []string, found :%v", fromFileStrings)
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}
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delegate.FileSources = fromFileArray
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delete(genericParams, "from-file")
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}
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fromLiteralStrings, found := genericParams["from-literal"]
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if found {
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fromLiteralArray, isArray := fromLiteralStrings.([]string)
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if !isArray {
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return nil, fmt.Errorf("expected []string, found :%v", fromLiteralStrings)
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}
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delegate.LiteralSources = fromLiteralArray
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delete(genericParams, "from-literal")
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}
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fromEnvFileString, found := genericParams["from-env-file"]
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if found {
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fromEnvFile, isString := fromEnvFileString.(string)
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if !isString {
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return nil, fmt.Errorf("expected string, found :%v", fromEnvFileString)
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}
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delegate.EnvFileSource = fromEnvFile
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delete(genericParams, "from-env-file")
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}
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hashParam, found := genericParams["append-hash"]
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if found {
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hashBool, isBool := hashParam.(bool)
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if !isBool {
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return nil, fmt.Errorf("expected bool, found :%v", hashParam)
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}
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delegate.AppendHash = hashBool
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delete(genericParams, "append-hash")
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}
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params := map[string]string{}
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for key, value := range genericParams {
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strVal, isString := value.(string)
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if !isString {
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return nil, fmt.Errorf("expected string, saw %v for '%s'", value, key)
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}
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params[key] = strVal
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}
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delegate.Name = params["name"]
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delegate.Type = params["type"]
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return delegate.StructuredGenerate()
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}
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// ParamNames returns the set of supported input parameters when using the parameter injection generator pattern.
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func (s ConfigMapGeneratorV1) ParamNames() []GeneratorParam {
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return []GeneratorParam{
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{"name", true},
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{"type", false},
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{"from-file", false},
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{"from-literal", false},
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{"from-env-file", false},
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{"force", false},
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{"hash", false},
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}
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}
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// StructuredGenerate outputs a configMap object using the configured fields.
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func (s ConfigMapGeneratorV1) StructuredGenerate() (runtime.Object, error) {
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if err := s.validate(); err != nil {
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return nil, err
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}
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configMap := &v1.ConfigMap{}
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configMap.Name = s.Name
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configMap.Data = map[string]string{}
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if len(s.FileSources) > 0 {
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if err := handleConfigMapFromFileSources(configMap, s.FileSources); err != nil {
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return nil, err
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}
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}
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if len(s.LiteralSources) > 0 {
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if err := handleConfigMapFromLiteralSources(configMap, s.LiteralSources); err != nil {
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return nil, err
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}
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}
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if len(s.EnvFileSource) > 0 {
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if err := handleConfigMapFromEnvFileSource(configMap, s.EnvFileSource); err != nil {
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return nil, err
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}
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}
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if s.AppendHash {
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h, err := hash.ConfigMapHash(configMap)
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if err != nil {
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return nil, err
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}
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configMap.Name = fmt.Sprintf("%s-%s", configMap.Name, h)
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}
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return configMap, nil
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}
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// validate validates required fields are set to support structured generation.
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func (s ConfigMapGeneratorV1) validate() error {
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if len(s.Name) == 0 {
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return fmt.Errorf("name must be specified")
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}
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if len(s.EnvFileSource) > 0 && (len(s.FileSources) > 0 || len(s.LiteralSources) > 0) {
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return fmt.Errorf("from-env-file cannot be combined with from-file or from-literal")
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}
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return nil
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}
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// handleConfigMapFromLiteralSources adds the specified literal source
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// information into the provided configMap.
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func handleConfigMapFromLiteralSources(configMap *v1.ConfigMap, literalSources []string) error {
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for _, literalSource := range literalSources {
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keyName, value, err := util.ParseLiteralSource(literalSource)
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if err != nil {
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return err
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}
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err = addKeyFromLiteralToConfigMap(configMap, keyName, value)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// handleConfigMapFromFileSources adds the specified file source information
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// into the provided configMap
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func handleConfigMapFromFileSources(configMap *v1.ConfigMap, fileSources []string) error {
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for _, fileSource := range fileSources {
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keyName, filePath, err := util.ParseFileSource(fileSource)
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if err != nil {
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return err
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}
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info, err := os.Stat(filePath)
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if err != nil {
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switch err := err.(type) {
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case *os.PathError:
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return fmt.Errorf("error reading %s: %v", filePath, err.Err)
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default:
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return fmt.Errorf("error reading %s: %v", filePath, err)
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}
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}
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if info.IsDir() {
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if strings.Contains(fileSource, "=") {
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return fmt.Errorf("cannot give a key name for a directory path.")
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}
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fileList, err := ioutil.ReadDir(filePath)
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if err != nil {
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return fmt.Errorf("error listing files in %s: %v", filePath, err)
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}
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for _, item := range fileList {
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itemPath := path.Join(filePath, item.Name())
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if item.Mode().IsRegular() {
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keyName = item.Name()
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err = addKeyFromFileToConfigMap(configMap, keyName, itemPath)
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if err != nil {
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return err
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}
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}
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}
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} else {
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if err := addKeyFromFileToConfigMap(configMap, keyName, filePath); err != nil {
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return err
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}
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}
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}
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return nil
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}
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// handleConfigMapFromEnvFileSource adds the specified env file source information
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// into the provided configMap
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func handleConfigMapFromEnvFileSource(configMap *v1.ConfigMap, envFileSource string) error {
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info, err := os.Stat(envFileSource)
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if err != nil {
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switch err := err.(type) {
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case *os.PathError:
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return fmt.Errorf("error reading %s: %v", envFileSource, err.Err)
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default:
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return fmt.Errorf("error reading %s: %v", envFileSource, err)
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}
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}
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if info.IsDir() {
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return fmt.Errorf("env config file cannot be a directory")
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}
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return addFromEnvFile(envFileSource, func(key, value string) error {
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return addKeyFromLiteralToConfigMap(configMap, key, value)
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})
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}
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// addKeyFromFileToConfigMap adds a key with the given name to a ConfigMap, populating
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// the value with the content of the given file path, or returns an error.
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func addKeyFromFileToConfigMap(configMap *v1.ConfigMap, keyName, filePath string) error {
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data, err := ioutil.ReadFile(filePath)
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if err != nil {
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return err
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}
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return addKeyFromLiteralToConfigMap(configMap, keyName, string(data))
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}
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// addKeyFromLiteralToConfigMap adds the given key and data to the given config map,
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// returning an error if the key is not valid or if the key already exists.
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func addKeyFromLiteralToConfigMap(configMap *v1.ConfigMap, keyName, data string) error {
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// Note, the rules for ConfigMap keys are the exact same as the ones for SecretKeys.
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if errs := validation.IsConfigMapKey(keyName); len(errs) != 0 {
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return fmt.Errorf("%q is not a valid key name for a ConfigMap: %s", keyName, strings.Join(errs, ";"))
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}
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if _, entryExists := configMap.Data[keyName]; entryExists {
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return fmt.Errorf("cannot add key %s, another key by that name already exists: %v.", keyName, configMap.Data)
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}
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configMap.Data[keyName] = data
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return nil
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}
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