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migrator.go
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/
migrator.go
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package api
import (
"compress/gzip"
"context"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"sync"
"time"
"github.com/go-chi/chi"
"github.com/go-chi/render"
log "github.com/go-pkgz/lgr"
R "github.com/go-pkgz/rest"
"github.com/go-pkgz/rest/cache"
"github.com/pkg/errors"
"github.com/umputun/remark/backend/app/migrator"
"github.com/umputun/remark/backend/app/rest"
)
// Migrator rest with import and export controllers
type Migrator struct {
Cache cache.LoadingCache
NativeImporter migrator.Importer
DisqusImporter migrator.Importer
WordPressImporter migrator.Importer
NativeExporter migrator.Exporter
KeyStore KeyStore
busy map[string]bool
lock sync.Mutex
}
// KeyStore defines sub-interface for consumers needed just a key
type KeyStore interface {
Key() (key string, err error)
}
func (m *Migrator) withRoutes(router chi.Router) chi.Router {
router.Get("/export", m.exportCtrl)
router.Post("/import", m.importCtrl)
router.Post("/import/form", m.importFormCtrl)
router.Get("/import/wait", m.importWaitCtrl)
return router
}
// POST /import?secret=key&site=site-id&provider=disqus|remark|wordpress
// imports comments from post body.
func (m *Migrator) importCtrl(w http.ResponseWriter, r *http.Request) {
siteID := r.URL.Query().Get("site")
if m.isBusy(siteID) {
rest.SendErrorJSON(w, r, http.StatusConflict, errors.New("already running"), "import rejected")
return
}
tmpfile, err := m.saveTemp(r.Body)
if err != nil {
rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "can't save request to temp file")
return
}
go m.runImport(siteID, r.URL.Query().Get("provider"), tmpfile) // import runs in background and sets busy flag for site
render.Status(r, http.StatusAccepted)
render.JSON(w, r, R.JSON{"status": "import request accepted"})
}
// POST /import/form?secret=key&site=site-id&provider=disqus|remark|wordpress
// imports comments from form body.
func (m *Migrator) importFormCtrl(w http.ResponseWriter, r *http.Request) {
siteID := r.URL.Query().Get("site")
if m.isBusy(siteID) {
rest.SendErrorJSON(w, r, http.StatusConflict, errors.New("already running"), "import rejected")
return
}
if err := r.ParseMultipartForm(20 * 1024 * 1024); err != nil { // 20M max memory, if bigger will make a file
rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "can't parse multipart form")
return
}
file, _, err := r.FormFile("file")
if err != nil {
rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "can't get import from the request")
return
}
defer func() { _ = file.Close() }()
tmpfile, err := m.saveTemp(file)
if err != nil {
rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "can't save request to temp file")
return
}
go m.runImport(siteID, r.URL.Query().Get("provider"), tmpfile) // import runs in background and sets busy flag for site
render.Status(r, http.StatusAccepted)
render.JSON(w, r, R.JSON{"status": "import request accepted"})
}
func (m *Migrator) importWaitCtrl(w http.ResponseWriter, r *http.Request) {
siteID := r.URL.Query().Get("site")
timeOut := time.Minute * 15
if v := r.URL.Query().Get("timeout"); v != "" {
if vv, e := time.ParseDuration(v); e == nil {
timeOut = vv
}
}
ctx, cancel := context.WithTimeout(context.Background(), timeOut)
defer cancel()
for {
if !m.isBusy(siteID) {
break
}
select {
case <-ctx.Done():
render.Status(r, http.StatusGatewayTimeout)
render.JSON(w, r, R.JSON{"status": "timeout expired", "site_id": siteID})
return
case <-time.After(100 * time.Millisecond):
}
}
render.Status(r, http.StatusOK)
render.JSON(w, r, R.JSON{"status": "completed", "site_id": siteID})
}
// GET /export?site=site-id&secret=12345&?mode=file|stream
// exports all comments for siteID as gz file
func (m *Migrator) exportCtrl(w http.ResponseWriter, r *http.Request) {
siteID := r.URL.Query().Get("site")
var writer io.Writer = w
if r.URL.Query().Get("mode") == "file" {
exportFile := fmt.Sprintf("%s-%s.json.gz", siteID, time.Now().Format("20060102"))
w.Header().Set("Content-Type", "application/gzip")
w.Header().Set("Content-Disposition", "attachment;filename="+exportFile)
w.WriteHeader(http.StatusOK)
gzWriter := gzip.NewWriter(w)
defer func() {
if e := gzWriter.Close(); e != nil {
log.Printf("[WARN] can't close gzip writer, %s", e)
}
}()
writer = gzWriter
}
if _, err := m.NativeExporter.Export(writer, siteID); err != nil {
rest.SendErrorJSON(w, r, http.StatusInternalServerError, err, "export failed")
return
}
}
// runImport reads from tmpfile and import for given siteID and provider
func (m *Migrator) runImport(siteID string, provider string, tmpfile string) {
m.setBusy(siteID, true)
defer func() {
m.setBusy(siteID, false)
if err := os.Remove(tmpfile); err != nil {
log.Printf("[WARN] failed to remove tmp file %s, %v", tmpfile, err)
}
}()
var importer migrator.Importer
switch provider {
case "disqus":
importer = m.DisqusImporter
case "wordpress":
importer = m.WordPressImporter
default:
importer = m.NativeImporter
}
log.Printf("[DEBUG] import request for site=%s, provider=%s", siteID, provider)
fh, err := os.Open(tmpfile)
if err != nil {
log.Printf("[WARN] import failed, %v", err)
return
}
size, err := importer.Import(fh, siteID)
if err != nil {
log.Printf("[WARN] import failed, %v", err)
return
}
m.Cache.Flush(cache.Flusher(siteID).Scopes(siteID))
log.Printf("[DEBUG] import request completed. site=%s, provider=%s, comments=%d", siteID, provider, size)
}
// saveTemp reads from reader and saves to temp file
func (m *Migrator) saveTemp(r io.Reader) (string, error) {
tmpfile, err := ioutil.TempFile("", "remark42_import")
if err != nil {
return "", errors.Wrap(err, "can't make temp file")
}
if _, err = io.Copy(tmpfile, r); err != nil {
return "", errors.Wrap(err, "can't copy to temp file")
}
if err = tmpfile.Close(); err != nil {
return "", errors.Wrap(err, "can't close temp file")
}
return tmpfile.Name(), nil
}
// isBusy checks busy flag from the map by siteID as key
func (m *Migrator) isBusy(siteID string) bool {
m.lock.Lock()
defer m.lock.Unlock()
if m.busy == nil {
m.busy = map[string]bool{}
}
return m.busy[siteID]
}
// setBusy sets/resets busy flag to the map by siteID as key
func (m *Migrator) setBusy(siteID string, status bool) {
m.lock.Lock()
defer m.lock.Unlock()
if m.busy == nil {
m.busy = map[string]bool{}
}
m.busy[siteID] = status
}