483 lines
13 KiB
Go
483 lines
13 KiB
Go
package fetcher
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import (
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"time"
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"github.com/mholt/archiver"
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"github.com/satori/go.uuid"
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k8serr "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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"github.com/fission/fission"
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"github.com/fission/fission/crd"
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storageSvcClient "github.com/fission/fission/storagesvc/client"
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)
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type (
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FetchRequestType int
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FetchRequest struct {
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FetchType FetchRequestType `json:"fetchType"`
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Package metav1.ObjectMeta `json:"package"`
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Url string `json:"url"`
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StorageSvcUrl string `json:"storagesvcurl"`
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Filename string `json:"filename"`
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Secrets []fission.SecretReference `json:"secretList"`
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ConfigMaps []fission.ConfigMapReference `json:"configMapList"`
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}
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// UploadRequest send from builder manager describes which
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// deployment package should be upload to storage service.
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UploadRequest struct {
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Filename string `json:"filename"`
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StorageSvcUrl string `json:"storagesvcurl"`
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}
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// UploadResponse defines the download url of an archive and
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// its checksum.
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UploadResponse struct {
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ArchiveDownloadUrl string `json:"archiveDownloadUrl"`
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Checksum fission.Checksum `json:"checksum"`
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}
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Fetcher struct {
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sharedVolumePath string
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sharedSecretPath string
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sharedConfigPath string
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fissionClient *crd.FissionClient
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kubeClient *kubernetes.Clientset
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}
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)
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const (
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FETCH_SOURCE = iota
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FETCH_DEPLOYMENT
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FETCH_URL // remove this?
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)
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func makeVolumeDir(dirPath string) {
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err := os.MkdirAll(dirPath, os.ModeDir|0700)
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if err != nil {
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log.Fatalf("Error creating %v: %v", dirPath, err)
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}
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}
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func MakeFetcher(sharedVolumePath string, sharedSecretPath string, sharedConfigPath string) (*Fetcher, error) {
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makeVolumeDir(sharedVolumePath)
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makeVolumeDir(sharedSecretPath)
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makeVolumeDir(sharedConfigPath)
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fissionClient, kubeClient, _, err := crd.MakeFissionClient()
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if err != nil {
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return nil, err
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}
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return &Fetcher{
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sharedVolumePath: sharedVolumePath,
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sharedSecretPath: sharedSecretPath,
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sharedConfigPath: sharedConfigPath,
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fissionClient: fissionClient,
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kubeClient: kubeClient,
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}, nil
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}
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func downloadUrl(url string, localPath string) error {
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resp, err := http.Get(url)
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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w, err := os.Create(localPath)
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if err != nil {
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return err
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}
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_, err = io.Copy(w, resp.Body)
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if err != nil {
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return err
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}
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err = os.Chmod(localPath, 0600)
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if err != nil {
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return err
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}
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return nil
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}
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func getChecksum(path string) (*fission.Checksum, error) {
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f, err := os.Open(path)
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if err != nil {
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return nil, err
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}
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defer f.Close()
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hasher := sha256.New()
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_, err = io.Copy(hasher, f)
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if err != nil {
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return nil, err
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}
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c := hex.EncodeToString(hasher.Sum(nil))
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return &fission.Checksum{
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Type: fission.ChecksumTypeSHA256,
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Sum: c,
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}, nil
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}
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func verifyChecksum(path string, checksum *fission.Checksum) error {
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if checksum.Type != fission.ChecksumTypeSHA256 {
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return fission.MakeError(fission.ErrorInvalidArgument, "Unsupported checksum type")
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}
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c, err := getChecksum(path)
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if err != nil {
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return err
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}
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if c.Sum != checksum.Sum {
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return fission.MakeError(fission.ErrorChecksumFail, "Checksum validation failed")
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}
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return nil
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}
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func writeSecretOrConfigMap(dataMap map[string][]byte, dirPath string) error {
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for key, val := range dataMap {
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writeFilePath := filepath.Join(dirPath, key)
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err := ioutil.WriteFile(writeFilePath, val, 0600)
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if err != nil {
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e := fmt.Sprintf("Failed to write file %v: %v", writeFilePath, err)
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log.Printf(e)
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return errors.New(e)
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}
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}
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return nil
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}
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func (fetcher *Fetcher) VersionHandler(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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fmt.Fprintf(w, fission.VersionInfo().String())
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}
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func (fetcher *Fetcher) FetchHandler(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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http.Error(w, "only POST is supported on this endpoint", http.StatusMethodNotAllowed)
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return
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}
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startTime := time.Now()
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defer func() {
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elapsed := time.Since(startTime)
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log.Printf("elapsed time in fetch request = %v", elapsed)
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}()
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// parse request
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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log.Printf("Error reading request body")
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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var req FetchRequest
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err = json.Unmarshal(body, &req)
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if err != nil {
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log.Printf("Error reading request body: %v", err)
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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log.Printf("fetcher received fetch request and started downloading: %v", req)
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code, err := fetcher.Fetch(req)
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if err != nil {
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http.Error(w, err.Error(), code)
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return
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}
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log.Printf("Checking secrets/cfgmaps")
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code, err = fetcher.FetchSecretsAndCfgMaps(req.Secrets, req.ConfigMaps)
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if err != nil {
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http.Error(w, err.Error(), code)
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return
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}
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log.Printf("Completed fetch request")
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// all done
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w.WriteHeader(http.StatusOK)
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}
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// Fetch takes FetchRequest and makes the fetch call
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// It returns the HTTP code and error if any
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func (fetcher *Fetcher) Fetch(req FetchRequest) (int, error) {
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tmpFile := req.Filename + ".tmp"
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tmpPath := filepath.Join(fetcher.sharedVolumePath, tmpFile)
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if req.FetchType == FETCH_URL {
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// fetch the file and save it to the tmp path
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err := downloadUrl(req.Url, tmpPath)
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if err != nil {
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e := fmt.Sprintf("Failed to download url %v: %v", req.Url, err)
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log.Printf(e)
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return 400, errors.New(e)
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}
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} else {
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// get pkg
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pkg, err := fetcher.fissionClient.Packages(req.Package.Namespace).Get(req.Package.Name)
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if err != nil {
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e := fmt.Sprintf("Failed to get package: %v", err)
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log.Printf(e)
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return 500, errors.New(e)
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}
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var archive *fission.Archive
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if req.FetchType == FETCH_SOURCE {
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archive = &pkg.Spec.Source
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} else if req.FetchType == FETCH_DEPLOYMENT {
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archive = &pkg.Spec.Deployment
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}
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// get package data as literal or by url
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if len(archive.Literal) > 0 {
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// write pkg.Literal into tmpPath
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err = ioutil.WriteFile(tmpPath, archive.Literal, 0600)
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if err != nil {
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e := fmt.Sprintf("Failed to write file %v: %v", tmpPath, err)
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log.Printf(e)
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return 500, errors.New(e)
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}
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} else {
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// download and verify
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err = downloadUrl(archive.URL, tmpPath)
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if err != nil {
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e := fmt.Sprintf("Failed to download url %v: %v", req.Url, err)
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log.Printf(e)
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return 400, errors.New(e)
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}
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err = verifyChecksum(tmpPath, &archive.Checksum)
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if err != nil {
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e := fmt.Sprintf("Failed to verify checksum: %v", err)
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log.Printf(e)
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return 400, errors.New(e)
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}
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}
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}
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// check file type here, if the file is a zip file unarchive it.
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if archiver.Zip.Match(tmpPath) {
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// unarchive tmp file to a tmp unarchive path
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tmpUnarchivePath := filepath.Join(fetcher.sharedVolumePath, uuid.NewV4().String())
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err := fetcher.unarchive(tmpPath, tmpUnarchivePath)
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if err != nil {
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log.Println(err.Error())
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return 500, err
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}
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tmpPath = tmpUnarchivePath
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}
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// move tmp file to requested filename
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err := fetcher.rename(tmpPath, filepath.Join(fetcher.sharedVolumePath, req.Filename))
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if err != nil {
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log.Println(err.Error())
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return 500, err
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}
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log.Printf("Successfully placed at %v", filepath.Join(fetcher.sharedVolumePath, req.Filename))
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return 200, nil
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}
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// FetchSecretsAndCfgMaps fetches secrets and configmaps specified by user
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// It returns the HTTP code and error if any
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func (fetcher *Fetcher) FetchSecretsAndCfgMaps(secrets []fission.SecretReference, cfgmaps []fission.ConfigMapReference) (int, error) {
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if len(secrets) > 0 {
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for _, secret := range secrets {
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data, err := fetcher.kubeClient.CoreV1().Secrets(secret.Namespace).Get(secret.Name, metav1.GetOptions{})
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if err != nil {
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e := fmt.Sprintf("Failed to get secret from kubeapi: %v", err)
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log.Printf(e)
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httpCode := http.StatusInternalServerError
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if k8serr.IsNotFound(err) {
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httpCode = http.StatusNotFound
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}
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return httpCode, errors.New(e)
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}
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secretPath := filepath.Join(secret.Namespace, secret.Name)
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secretDir := filepath.Join(fetcher.sharedSecretPath, secretPath)
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err = os.MkdirAll(secretDir, os.ModeDir|0644)
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if err != nil {
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e := fmt.Sprintf("Failed to create directory %v: %v", secretDir, err)
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log.Printf(e)
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return http.StatusInternalServerError, errors.New(e)
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}
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err = writeSecretOrConfigMap(data.Data, secretDir)
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if err != nil {
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return http.StatusInternalServerError, err
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}
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}
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}
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if len(cfgmaps) > 0 {
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for _, config := range cfgmaps {
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data, err := fetcher.kubeClient.CoreV1().ConfigMaps(config.Namespace).Get(config.Name, metav1.GetOptions{})
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if err != nil {
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e := fmt.Sprintf("Failed to get configmap from kubeapi: %v", err)
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log.Printf(e)
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httpCode := http.StatusInternalServerError
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if k8serr.IsNotFound(err) {
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httpCode = http.StatusNotFound
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}
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return httpCode, errors.New(e)
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}
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configPath := filepath.Join(config.Namespace, config.Name)
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configDir := filepath.Join(fetcher.sharedConfigPath, configPath)
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err = os.MkdirAll(configDir, os.ModeDir|0644)
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if err != nil {
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e := fmt.Sprintf("Failed to create directory %v: %v", configDir, err)
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log.Printf(e)
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return http.StatusInternalServerError, errors.New(e)
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}
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configMap := make(map[string][]byte)
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for key, val := range data.Data {
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configMap[key] = []byte(val)
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}
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err = writeSecretOrConfigMap(configMap, configDir)
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if err != nil {
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return http.StatusInternalServerError, err
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}
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}
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}
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return http.StatusOK, nil
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}
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func (fetcher *Fetcher) UploadHandler(w http.ResponseWriter, r *http.Request) {
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if r.Method != "POST" {
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http.Error(w, "only POST is supported on this endpoint", http.StatusMethodNotAllowed)
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return
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}
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startTime := time.Now()
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defer func() {
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elapsed := time.Since(startTime)
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log.Printf("elapsed time in upload request = %v", elapsed)
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}()
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// parse request
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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log.Printf("Error reading request body")
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http.Error(w, err.Error(), http.StatusInternalServerError)
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return
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}
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var req UploadRequest
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err = json.Unmarshal(body, &req)
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if err != nil {
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log.Printf("Error reading request body: %v", err)
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http.Error(w, err.Error(), http.StatusBadRequest)
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return
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}
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log.Printf("fetcher received upload request: %v", req)
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zipFilename := req.Filename + ".zip"
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srcFilepath := filepath.Join(fetcher.sharedVolumePath, req.Filename)
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dstFilepath := filepath.Join(fetcher.sharedVolumePath, zipFilename)
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err = fetcher.archive(srcFilepath, dstFilepath)
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if err != nil {
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e := fmt.Sprintf("Error archiving zip file: %v", err)
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log.Println(e)
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http.Error(w, e, http.StatusInternalServerError)
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return
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}
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log.Println("Starting upload...")
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ssClient := storageSvcClient.MakeClient(req.StorageSvcUrl)
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fileID, err := ssClient.Upload(dstFilepath, nil)
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if err != nil {
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e := fmt.Sprintf("Error uploading zip file: %v", err)
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log.Println(e)
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http.Error(w, e, http.StatusInternalServerError)
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return
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}
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sum, err := getChecksum(dstFilepath)
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if err != nil {
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e := fmt.Sprintf("Error calculating checksum of zip file: %v", err)
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log.Println(e)
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http.Error(w, e, http.StatusInternalServerError)
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return
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}
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resp := UploadResponse{
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ArchiveDownloadUrl: ssClient.GetUrl(fileID),
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Checksum: *sum,
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}
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rBody, err := json.Marshal(resp)
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if err != nil {
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e := fmt.Sprintf("Error encoding upload response: %v", err)
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log.Println(e)
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http.Error(w, e, http.StatusInternalServerError)
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return
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}
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log.Println("Completed upload request")
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w.Header().Add("Content-Type", "application/json")
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w.Write(rBody)
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w.WriteHeader(http.StatusOK)
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}
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func (fetcher *Fetcher) rename(src string, dst string) error {
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err := os.Rename(src, dst)
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if err != nil {
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return errors.New(fmt.Sprintf("Failed to move file: %v", err))
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}
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return nil
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}
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// archive zips the contents of directory at src into a new zip file
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// at dst (note that the contents are zipped, not the directory itself).
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func (fetcher *Fetcher) archive(src string, dst string) error {
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var files []string
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target, err := os.Stat(src)
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if err != nil {
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return errors.New(fmt.Sprintf("Failed to zip file: %v", err))
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}
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if target.IsDir() {
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// list all
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fs, _ := ioutil.ReadDir(src)
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for _, f := range fs {
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files = append(files, filepath.Join(src, f.Name()))
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}
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} else {
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files = append(files, src)
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}
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return archiver.Zip.Make(dst, files)
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}
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// unarchive is a function that unzips a zip file to destination
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func (fetcher *Fetcher) unarchive(src string, dst string) error {
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err := archiver.Zip.Open(src, dst)
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if err != nil {
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return errors.New(fmt.Sprintf("Failed to unzip file: %v", err))
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}
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return nil
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}
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