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uploadserver.go
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uploadserver.go
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/*
* This file is part of the CDI project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2018 Red Hat, Inc.
*
*/
package uploadserver
import (
"compress/gzip"
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"io/ioutil"
"net"
"net/http"
"path/filepath"
"sync"
"github.com/pkg/errors"
"k8s.io/klog"
"kubevirt.io/containerized-data-importer/pkg/common"
"kubevirt.io/containerized-data-importer/pkg/importer"
"kubevirt.io/containerized-data-importer/pkg/util"
)
const (
// UploadContentTypeHeader is the header upload clients may use to set the content type explicitly
UploadContentTypeHeader = "x-cdi-content-type"
// FilesystemCloneContentType is the content type when cloning a filesystem
FilesystemCloneContentType = "filesystem-clone"
// BlockdeviceCloneContentType is the content type when cloning a block device
BlockdeviceCloneContentType = "blockdevice-clone"
healthzPort = 8080
healthzPath = "/healthz"
)
// UploadServer is the interface to uploadServerApp
type UploadServer interface {
Run() error
}
type uploadServerApp struct {
bindAddress string
bindPort int
destination string
tlsKey string
tlsCert string
clientCert string
clientName string
keyFile string
certFile string
imageSize string
mux *http.ServeMux
uploading bool
done bool
doneChan chan struct{}
mutex sync.Mutex
}
// may be overridden in tests
var uploadProcessorFunc = newUploadStreamProcessor
// NewUploadServer returns a new instance of uploadServerApp
func NewUploadServer(bindAddress string, bindPort int, destination, tlsKey, tlsCert, clientCert, clientName, imageSize string) UploadServer {
server := &uploadServerApp{
bindAddress: bindAddress,
bindPort: bindPort,
destination: destination,
tlsKey: tlsKey,
tlsCert: tlsCert,
clientCert: clientCert,
clientName: clientName,
imageSize: imageSize,
mux: http.NewServeMux(),
uploading: false,
done: false,
doneChan: make(chan struct{}),
}
server.mux.HandleFunc(healthzPath, server.healthzHandler)
server.mux.HandleFunc(common.UploadPath, server.uploadHandler)
return server
}
func (app *uploadServerApp) Run() error {
uploadServer, err := app.createUploadServer()
if err != nil {
return errors.Wrap(err, "Error creating upload http server")
}
healthzServer, err := app.createHealthzServer()
if err != nil {
return errors.Wrap(err, "Error creating healthz http server")
}
uploadListener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", app.bindAddress, app.bindPort))
if err != nil {
return errors.Wrap(err, "Error creating upload listerner")
}
healthzListener, err := net.Listen("tcp", fmt.Sprintf(":%d", healthzPort))
if err != nil {
return errors.Wrap(err, "Error creating healthz listerner")
}
errChan := make(chan error)
go func() {
defer uploadListener.Close()
// maybe bind port was 0 (unit tests) assign port here
app.bindPort = uploadListener.Addr().(*net.TCPAddr).Port
if app.keyFile != "" && app.certFile != "" {
errChan <- uploadServer.ServeTLS(uploadListener, app.certFile, app.keyFile)
return
}
// not sure we want to support this code path
errChan <- uploadServer.Serve(uploadListener)
}()
go func() {
defer healthzServer.Close()
errChan <- healthzServer.Serve(healthzListener)
}()
select {
case err = <-errChan:
klog.Errorf("HTTP server returned error %s", err.Error())
case <-app.doneChan:
klog.Info("Shutting down http server after successful upload")
healthzServer.Shutdown(context.Background())
uploadServer.Shutdown(context.Background())
}
return err
}
func (app *uploadServerApp) createUploadServer() (*http.Server, error) {
server := &http.Server{
Handler: app,
}
if app.tlsKey != "" && app.tlsCert != "" {
certDir, err := ioutil.TempDir("", "uploadserver-tls")
if err != nil {
return nil, errors.Wrap(err, "Error creating cert dir")
}
app.keyFile = filepath.Join(certDir, "tls.key")
app.certFile = filepath.Join(certDir, "tls.crt")
err = ioutil.WriteFile(app.keyFile, []byte(app.tlsKey), 0600)
if err != nil {
return nil, errors.Wrap(err, "Error creating key file")
}
err = ioutil.WriteFile(app.certFile, []byte(app.tlsCert), 0600)
if err != nil {
return nil, errors.Wrap(err, "Error creating cert file")
}
}
if app.clientCert != "" {
caCertPool := x509.NewCertPool()
if ok := caCertPool.AppendCertsFromPEM([]byte(app.clientCert)); !ok {
klog.Fatalf("Invalid ca cert file %s", app.clientCert)
}
server.TLSConfig = &tls.Config{
ClientCAs: caCertPool,
ClientAuth: tls.RequireAndVerifyClientCert,
}
}
return server, nil
}
func (app *uploadServerApp) createHealthzServer() (*http.Server, error) {
mux := http.NewServeMux()
mux.HandleFunc(healthzPath, app.healthzHandler)
return &http.Server{Handler: mux}, nil
}
func (app *uploadServerApp) ServeHTTP(w http.ResponseWriter, r *http.Request) {
app.mux.ServeHTTP(w, r)
}
func (app *uploadServerApp) healthzHandler(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "OK")
}
func (app *uploadServerApp) uploadHandler(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
w.WriteHeader(http.StatusNotFound)
return
}
if r.TLS != nil {
found := false
for _, cert := range r.TLS.PeerCertificates {
if cert.Subject.CommonName == app.clientName {
found = true
break
}
}
if !found {
w.WriteHeader(http.StatusUnauthorized)
return
}
} else {
klog.V(3).Infof("Handling HTTP connection")
}
exit := func() bool {
app.mutex.Lock()
defer app.mutex.Unlock()
if app.uploading {
w.WriteHeader(http.StatusServiceUnavailable)
return true
}
if app.done {
w.WriteHeader(http.StatusConflict)
return true
}
app.uploading = true
return false
}()
if exit {
klog.Warning("Got concurrent upload request")
return
}
cdiContentType := r.Header.Get(UploadContentTypeHeader)
klog.Infof("Content type header is %q\n", cdiContentType)
err := uploadProcessorFunc(r.Body, app.destination, app.imageSize, cdiContentType)
app.mutex.Lock()
defer app.mutex.Unlock()
if err != nil {
klog.Errorf("Saving stream failed: %s", err)
w.WriteHeader(http.StatusInternalServerError)
app.uploading = false
return
}
app.uploading = false
app.done = true
close(app.doneChan)
klog.Infof("Wrote data to %s", app.destination)
}
func newUploadStreamProcessor(stream io.ReadCloser, dest, imageSize, contentType string) error {
if contentType == FilesystemCloneContentType {
return filesystemCloneProcessor(stream, common.ImporterVolumePath)
}
uds := importer.NewUploadDataSource(stream)
processor := importer.NewDataProcessor(uds, dest, common.ImporterVolumePath, common.ScratchDataDir, imageSize)
return processor.ProcessData()
}
func filesystemCloneProcessor(stream io.ReadCloser, destDir string) error {
if err := importer.CleanDir(destDir); err != nil {
return errors.Wrapf(err, "error removing contents of %s", destDir)
}
gzr, err := gzip.NewReader(stream)
if err != nil {
return errors.Wrap(err, "error creting gzip reader")
}
if err = util.UnArchiveTar(gzr, destDir); err != nil {
return errors.Wrapf(err, "error unarchiving to %s", destDir)
}
return nil
}