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from_reader.go
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from_reader.go
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// Copyright 2022 Namespace Labs 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.
package kubeparser
import (
"bufio"
"bytes"
"fmt"
"io"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
appsv1 "k8s.io/api/apps/v1"
batchv1 "k8s.io/api/batch/v1"
corev1 "k8s.io/api/core/v1"
networkingv1 "k8s.io/api/networking/v1"
rbacv1 "k8s.io/api/rbac/v1"
apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"namespacelabs.dev/foundation/framework/kubernetes/kubedef"
"namespacelabs.dev/foundation/internal/fnerrors"
"sigs.k8s.io/yaml"
)
func MultipleFromReader(description string, r io.Reader) ([]kubedef.Apply, error) {
br := bufio.NewReader(r)
var sections [][]byte
var buf bytes.Buffer
for {
line, err := br.ReadBytes('\n')
// Handle buffered data before returning errors.
if bytes.Equal(line, []byte("---\n")) || err == io.EOF {
copy := make([]byte, buf.Len())
_, _ = buf.Read(copy)
sections = append(sections, copy)
buf.Reset()
} else {
buf.Write(line)
}
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
}
// For simplicity, we do a two pass parse, first we walk through all resource
// types to instantiate the appropriate types, and then we actually parse them.
var actuals []kubedef.Apply
for _, sec := range sections {
p, err := Single(sec)
if err != nil {
return nil, err
}
actuals = append(actuals, kubedef.Apply{
Description: fmt.Sprintf("%s: %s %s", description, p.Kind, p.Name),
Resource: p.Resource,
})
}
return actuals, nil
}
type Parsed struct {
Kind string
Name string
Namespace string
Resource runtime.Object
}
func headerJsonOrYaml(contents []byte) (ObjHeader, error) {
var m ObjHeader
if err := yaml.Unmarshal(contents, &m); err != nil {
return ObjHeader{}, err
}
if m.Kind == "" {
return ObjHeader{}, fnerrors.BadInputError("kind is required")
}
if m.Name == "" {
return ObjHeader{}, fnerrors.BadInputError("name is required")
}
return m, nil
}
func Single(contents []byte) (Parsed, error) {
// For simplicity, we do a two pass parse, first we walk through all resource
// types to instantiate the appropriate types, and then we actually parse them.
m, err := headerJsonOrYaml(contents)
if err != nil {
return Parsed{}, err
}
msg := messageTypeFromKind(m.Kind)
if msg == nil {
return Parsed{}, fnerrors.BadInputError("don't know how to handle %q", m.Kind)
}
parsed := Parsed{
Kind: m.Kind,
Name: m.Name,
Namespace: m.Namespace,
Resource: msg,
}
if err := yaml.Unmarshal(contents, parsed.Resource); err != nil {
return Parsed{}, err
}
return parsed, nil
}
func messageTypeFromKind(kind string) runtime.Object {
switch kind {
case "Namespace":
return &corev1.Namespace{}
case "ServiceAccount":
return &corev1.ServiceAccount{}
case "ConfigMap":
return &corev1.ConfigMap{}
case "ClusterRole":
return &rbacv1.ClusterRole{}
case "ClusterRoleBinding":
return &rbacv1.ClusterRoleBinding{}
case "Role":
return &rbacv1.Role{}
case "RoleBinding":
return &rbacv1.RoleBinding{}
case "Service":
return &corev1.Service{}
case "Secret":
return &corev1.Secret{}
case "Deployment":
return &appsv1.Deployment{}
case "Ingress":
return &networkingv1.Ingress{}
case "IngressClass":
return &networkingv1.IngressClass{}
case "ValidatingWebhookConfiguration":
return &admissionregistrationv1.ValidatingWebhookConfiguration{}
case "CustomResourceDefinition":
return &apiextensionsv1.CustomResourceDefinition{}
case "Job":
return &batchv1.Job{}
}
return nil
}
type ObjHeader struct {
metav1.TypeMeta `json:",inline"`
metav1.ObjectMeta `json:"metadata,omitempty"`
}
func (obj ObjHeader) GetObjectKind() schema.ObjectKind {
return &obj.TypeMeta
}
func (obj ObjHeader) GetName() string {
return obj.Name
}
func (obj ObjHeader) GetNamespace() string {
return obj.Namespace
}