k3s/pkg/bootstrap/bootstrap.go

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package bootstrap
import (
"encoding/json"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"time"
"github.com/k3s-io/k3s/pkg/daemons/config"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func Handler(bootstrap *config.ControlRuntimeBootstrap) http.Handler {
return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
rw.Header().Set("Content-Type", "application/json")
ReadFromDisk(rw, bootstrap)
})
}
// ReadFromDisk reads the bootstrap data from the files on disk and
// writes their content in JSON form to the given io.Writer.
func ReadFromDisk(w io.Writer, bootstrap *config.ControlRuntimeBootstrap) error {
paths, err := ObjToMap(bootstrap)
if err != nil {
return nil
}
dataMap := make(map[string]File)
for pathKey, path := range paths {
if path == "" {
continue
}
data, err := ioutil.ReadFile(path)
if err != nil {
logrus.Warnf("failed to read %s", path)
continue
}
info, err := os.Stat(path)
if err != nil {
return err
}
dataMap[pathKey] = File{
Timestamp: info.ModTime(),
Content: data,
}
}
return json.NewEncoder(w).Encode(dataMap)
}
// File is a representation of a certificate
// or key file within the bootstrap context that contains
// the contents of the file as well as a timestamp from
// when the file was last modified.
type File struct {
Timestamp time.Time
Content []byte
}
type PathsDataformat map[string]File
// WriteToDiskFromStorage writes the contents of the given reader to the paths
// derived from within the ControlRuntimeBootstrap.
func WriteToDiskFromStorage(files PathsDataformat, bootstrap *config.ControlRuntimeBootstrap) error {
paths, err := ObjToMap(bootstrap)
if err != nil {
return err
}
for pathKey, bsf := range files {
path, ok := paths[pathKey]
if !ok {
continue
}
if err := os.MkdirAll(filepath.Dir(path), 0700); err != nil {
return errors.Wrapf(err, "failed to mkdir %s", filepath.Dir(path))
}
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if err := os.WriteFile(path, bsf.Content, 0600); err != nil {
return errors.Wrapf(err, "failed to write to %s", path)
}
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if err := os.Chtimes(path, bsf.Timestamp, bsf.Timestamp); err != nil {
return errors.Wrapf(err, "failed to update modified time on %s", path)
}
}
return nil
}
func ObjToMap(obj interface{}) (map[string]string, error) {
bytes, err := json.Marshal(obj)
if err != nil {
return nil, err
}
data := map[string]string{}
return data, json.Unmarshal(bytes, &data)
}