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loader.go
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loader.go
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package nodeup
import (
"bytes"
"encoding/json"
"fmt"
"github.com/golang/glog"
"k8s.io/kops/upup/pkg/api"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/loader"
"k8s.io/kops/upup/pkg/fi/nodeup/nodetasks"
"k8s.io/kops/util/pkg/vfs"
"strings"
"text/template"
)
type Loader struct {
templates []*template.Template
config *NodeUpConfig
cluster *api.Cluster
assets *fi.AssetStore
tasks map[string]fi.Task
tags map[string]struct{}
TemplateFunctions template.FuncMap
}
func NewLoader(config *NodeUpConfig, cluster *api.Cluster, assets *fi.AssetStore, tags map[string]struct{}) *Loader {
l := &Loader{}
l.assets = assets
l.tasks = make(map[string]fi.Task)
l.config = config
l.cluster = cluster
l.TemplateFunctions = make(template.FuncMap)
l.tags = tags
return l
}
func (l *Loader) executeTemplate(key string, d string) (string, error) {
t := template.New(key)
funcMap := make(template.FuncMap)
for k, fn := range l.TemplateFunctions {
funcMap[k] = fn
}
t.Funcs(funcMap)
context := l.cluster.Spec
_, err := t.Parse(d)
if err != nil {
return "", fmt.Errorf("error parsing template %q: %v", key, err)
}
t.Option("missingkey=zero")
var buffer bytes.Buffer
err = t.ExecuteTemplate(&buffer, key, context)
if err != nil {
return "", fmt.Errorf("error executing template %q: %v", key, err)
}
return buffer.String(), nil
}
func ignoreHandler(i *loader.TreeWalkItem) error {
return nil
}
func (l *Loader) Build(baseDir vfs.Path) (map[string]fi.Task, error) {
// First pass: load options
tw := &loader.TreeWalker{
DefaultHandler: ignoreHandler,
Contexts: map[string]loader.Handler{
"files": ignoreHandler,
"disks": ignoreHandler,
"packages": ignoreHandler,
"services": ignoreHandler,
"users": ignoreHandler,
},
Tags: l.tags,
}
err := tw.Walk(baseDir)
if err != nil {
return nil, err
}
// Second pass: load everything else
tw = &loader.TreeWalker{
DefaultHandler: l.handleFile,
Contexts: map[string]loader.Handler{
"files": l.handleFile,
"disks": l.newTaskHandler("disk/", nodetasks.NewMountDiskTask),
"packages": l.newTaskHandler("package/", nodetasks.NewPackage),
"services": l.newTaskHandler("service/", nodetasks.NewService),
"users": l.newTaskHandler("user/", nodetasks.NewUserTask),
},
Tags: l.tags,
}
err = tw.Walk(baseDir)
if err != nil {
return nil, err
}
// If there is a package task, we need an update packages task
for _, t := range l.tasks {
if _, ok := t.(*nodetasks.Package); ok {
glog.Infof("Package task found; adding UpdatePackages task")
l.tasks["UpdatePackages"] = nodetasks.NewUpdatePackages()
break
}
}
if l.tasks["UpdatePackages"] == nil {
glog.Infof("No package task found; won't update packages")
}
return l.tasks, nil
}
type TaskBuilder func(name string, contents string, meta string) (fi.Task, error)
func (r *Loader) newTaskHandler(prefix string, builder TaskBuilder) loader.Handler {
return func(i *loader.TreeWalkItem) error {
contents, err := i.ReadString()
if err != nil {
return err
}
name := i.Name
if strings.HasSuffix(name, ".template") {
name = strings.TrimSuffix(name, ".template")
expanded, err := r.executeTemplate(name, contents)
if err != nil {
return fmt.Errorf("error executing template %q: %v", i.RelativePath, err)
}
contents = expanded
}
task, err := builder(name, contents, i.Meta)
if err != nil {
return fmt.Errorf("error building %s for %q: %v", i.Name, i.Path, err)
}
key := prefix + i.RelativePath
if task != nil {
r.tasks[key] = task
}
return nil
}
}
func (r *Loader) handleFile(i *loader.TreeWalkItem) error {
var task *nodetasks.File
defaultFileType := nodetasks.FileType_File
var err error
if strings.HasSuffix(i.RelativePath, ".template") {
contents, err := i.ReadString()
if err != nil {
return err
}
// TODO: Use template resource here to defer execution?
destPath := "/" + strings.TrimSuffix(i.RelativePath, ".template")
name := strings.TrimSuffix(i.Name, ".template")
expanded, err := r.executeTemplate(name, contents)
if err != nil {
return fmt.Errorf("error executing template %q: %v", i.RelativePath, err)
}
task, err = nodetasks.NewFileTask(name, fi.NewStringResource(expanded), destPath, i.Meta)
} else if strings.HasSuffix(i.RelativePath, ".asset") {
contents, err := i.ReadBytes()
if err != nil {
return err
}
destPath := "/" + strings.TrimSuffix(i.RelativePath, ".asset")
name := strings.TrimSuffix(i.Name, ".asset")
def := &nodetasks.AssetDefinition{}
err = json.Unmarshal(contents, def)
if err != nil {
return fmt.Errorf("error parsing json for asset %q: %v", name, err)
}
asset, err := r.assets.Find(name, def.AssetPath)
if err != nil {
return fmt.Errorf("error trying to locate asset %q: %v", name, err)
}
if asset == nil {
return fmt.Errorf("unable to locate asset %q", name)
}
task, err = nodetasks.NewFileTask(i.Name, asset, destPath, i.Meta)
} else {
var contents fi.Resource
if vfs.IsDirectory(i.Path) {
defaultFileType = nodetasks.FileType_Directory
} else {
contents = fi.NewVFSResource(i.Path)
}
task, err = nodetasks.NewFileTask(i.Name, contents, "/"+i.RelativePath, i.Meta)
}
if task.Type == "" {
task.Type = defaultFileType
}
if err != nil {
return fmt.Errorf("error building task %q: %v", i.RelativePath, err)
}
glog.V(2).Infof("path %q -> task %v", i.Path, task)
if task != nil {
key := "file/" + i.RelativePath
r.tasks[key] = task
}
return nil
}