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Unified Diff: golden/go/pdfxform/main.go

Issue 1216483002: golden/pdfxform a pdf rasterization server (Closed) Base URL: https://skia.googlesource.com/buildbot@master
Patch Set: 2015-07-09 (Thursday) 15:12:53 EDT Created 5 years, 5 months ago
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Index: golden/go/pdfxform/main.go
diff --git a/golden/go/pdfxform/main.go b/golden/go/pdfxform/main.go
new file mode 100644
index 0000000000000000000000000000000000000000..6b737e83d9efd335d893e8015ae82f08772378d7
--- /dev/null
+++ b/golden/go/pdfxform/main.go
@@ -0,0 +1,496 @@
+// pdfxform is a server that rasterizes PDF documents into PNG
+package main
+
+import (
+ "bytes"
+ "crypto/md5"
+ "encoding/hex"
+ "encoding/json"
+ "flag"
+ "fmt"
+ "io"
+ "io/ioutil"
+ "net/http"
+ "os"
+ "os/user"
+ "path"
+ "path/filepath"
+ "strings"
+ "time"
+
+ "github.com/skia-dev/glog"
+ "go.skia.org/infra/go/auth"
+ "go.skia.org/infra/go/common"
+ "go.skia.org/infra/go/gs"
+ "go.skia.org/infra/go/pdf"
+ "go.skia.org/infra/go/util"
+ "go.skia.org/infra/perf/go/goldingester"
+ "google.golang.org/api/storage/v1"
+)
+
+////////////////////////////////////////////////////////////////////////////////
+
+const (
+ PNG_EXT = "png"
+ PDF_EXT = "pdf"
+)
+
+////////////////////////////////////////////////////////////////////////////////
+
+// md5OfFile calculates the MD5 checksum of a file.
+func md5OfFile(path string) (string, error) {
+ md5 := md5.New()
+ f, err := os.Open(path)
+ if err != nil {
+ return "", err
+ }
+ defer util.Close(f)
+ if _, err = io.Copy(md5, f); err != nil {
+ return "", err
+ }
+ return hex.EncodeToString(md5.Sum(nil)), nil
+}
+
+// removeIfExists is like util.Remove, but logs no error if the file does not exist.
+func removeIfExists(path string) {
+ if err := os.Remove(path); err != nil {
+ if !os.IsNotExist(err) {
+ glog.Errorf("Failed to Remove(%s): %v", path, err)
+ }
+ }
+}
+
+// isPDF returns true if the path appears to point to a PDF file.
+func isPDF(path string) bool {
+ f, err := os.Open(path)
+ if err != nil {
+ return false
+ }
+ defer util.Close(f)
+ buffer := make([]byte, 4)
+ if n, err := f.Read(buffer); n != 4 || err != nil {
+ return false
+ }
+ return string(buffer) == "%PDF"
+}
+
+// writeTo opens a file and dumps the contents of the reader into it.
+func writeTo(path string, reader *io.ReadCloser) error {
+ defer util.Close(*reader)
+ file, err := os.Create(path)
+ if err == nil {
+ _, err = io.Copy(file, *reader)
+ }
+ return err
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+// storageClient struct is used for uploading to cloud storage
+type storageClient struct {
+ httpClient *http.Client
+ storageService *storage.Service
+}
+
+// getClient returns an authorized storage.Service and the
+// corresponding http.Client; if anything goes wrong, it logs a fatal
+// error.
+func getClient() (storageClient, error) {
+ var client *http.Client
+ var err error
+ if *local {
+ client, err = auth.RunFlow(auth.OAuthConfig(*oauthCacheFile, auth.SCOPE_FULL_CONTROL))
+ // TODO(stephana): Replace auth.RunFlow with auth.NewClient
+ // client, err = auth.NewClient(true, *oauthCacheFile, auth.SCOPE_FULL_CONTROL, auth.SCOPE_GCE)
+ } else {
+ client = auth.GCEServiceAccountClient(&http.Transport{Dial: util.DialTimeout})
+ }
+ if err != nil {
+ return storageClient{}, err
+ }
+ gsService, err := storage.New(client)
+ if err != nil {
+ return storageClient{}, err
+ }
+ return storageClient{httpClient: client, storageService: gsService}, nil
+}
+
+// gsFetch fetch the object's data from google storage
+func gsFetch(object *storage.Object, sc storageClient) (io.ReadCloser, int64, error) {
+ request, err := gs.RequestForStorageURL(object.MediaLink)
+ if err != nil {
+ return nil, -1, err
+ }
+ resp, err := sc.httpClient.Do(request)
+ if err != nil {
+ return nil, -1, err
+ }
+ if resp.StatusCode != 200 {
+ _ = resp.Body.Close()
+ return nil, -1, fmt.Errorf("Failed to retrieve: %s %d %s", object.MediaLink, resp.StatusCode, resp.Status)
+ }
+ return resp.Body, resp.ContentLength, nil
+}
+
+// uploadFile uploads the specified file to the remote dir in Google
+// Storage. It also sets the appropriate ACLs on the uploaded file.
+// If the file already exists on the server, do nothing.
+func uploadFile(sc storageClient, input io.Reader, storageBucket, storagePath, accessControlEntity string) (bool, error) {
+ obj, _ := sc.storageService.Objects.Get(storageBucket, storagePath).Do()
+ if obj != nil {
+ return false, nil // noclobber
+ }
+ fullPath := fmt.Sprintf("gs://%s/%s", storageBucket, storagePath)
+ object := &storage.Object{Name: storagePath}
+ if _, err := sc.storageService.Objects.Insert(storageBucket, object).Media(input).Do(); err != nil {
+ return false, fmt.Errorf("Objects.Insert(%s) failed: %s", fullPath, err)
+ }
+ objectAcl := &storage.ObjectAccessControl{
+ Bucket: storageBucket, Entity: accessControlEntity, Object: storagePath, Role: "READER",
+ }
+ if _, err := sc.storageService.ObjectAccessControls.Insert(storageBucket, storagePath, objectAcl).Do(); err != nil {
+ return false, fmt.Errorf("Could not update ACL of %s: %s", fullPath, err)
+ }
+ return true, nil
+}
+
+////////////////////////////////////////////////////////////////////////////////
+
+var (
+ local = flag.Bool("local", false, "Set to true if not running in prod")
+ oauthCacheFile = flag.String("oauth_cache_file", "oauth_cache.dat", "Path to look for and store an OAuth token")
+ dataDir = flag.String("data_dir", "", "Directory to store data in.")
+ failureImage = flag.String("failure_image", "", "Location of a PNG image; must be set")
+ storageBucket = flag.String("storage_bucket", "chromium-skia-gm", "The bucket for json, pdf, and png files")
+ storageJsonDirectory = flag.String("storage_json_directory", "dm-json-v1", "The directory on bucket for json files.")
+ storageImagesDirectory = flag.String("storage_images_directory", "dm-images-v1", "The directory on bucket for png and pdf files.")
+ accessControlEntity = flag.String("access_control_entity", "domain-google.com", "The entity that has permissions to manage the bucket")
+ graphiteServer = flag.String("graphite_server", "skia-monitoring:2003", "Where the Graphite metrics ingestion server is running")
+)
+
+// The pdfXformer struct holds state
+type pdfXformer struct {
+ client storageClient
+ rasterizers []pdf.Rasterizer
+ results map[string]map[int]string
+ counter int
+ identifier string
+ errorImageMd5 string
+}
+
+// rasterizeOnce applies a single rastetizer to the given pdf file.
+// If the rasterizer fails, use the errorImage. If everything
+// succeeds, upload the PNG.
+func (xformer *pdfXformer) rasterizeOnce(pdfPath string, rasterizerIndex int) (string, error) {
+ rasterizer := xformer.rasterizers[rasterizerIndex]
+ tempdir := filepath.Dir(pdfPath)
+ pngPath := path.Join(tempdir, fmt.Sprintf("%s.%s", rasterizer.String(), PNG_EXT))
+ defer removeIfExists(pngPath)
+ glog.Infof("> > > > rasterizing with %s", rasterizer)
+ err := rasterizer.Rasterize(pdfPath, pngPath)
+ if err != nil {
+ glog.Warningf("rasterizing %s with %s failed: %s", filepath.Base(pdfPath), rasterizer.String(), err)
+ return xformer.errorImageMd5, nil
+ }
+ md5, err := md5OfFile(pngPath)
+ if err != nil {
+ return "", err
+ }
+ f, err := os.Open(pngPath)
+ if err != nil {
+ return "", err
+ }
+ defer util.Close(f)
+ pngUploadPath := fmt.Sprintf("%s/%s.%s", *storageImagesDirectory, md5, PNG_EXT)
+ didUpload, err := uploadFile(xformer.client, f, *storageBucket, pngUploadPath, *accessControlEntity)
+ if err != nil {
+ return "", err
+ }
+ if didUpload {
+ glog.Infof("> > > > uploaded %s", pngUploadPath)
+ }
+ return md5, nil
+}
+
+// makeTmpDir returns a nicely-named directory for temp files in $TMPDIR
+func (xformer *pdfXformer) makeTmpDir() (string, error) {
+ if xformer.identifier == "" {
+ var host, userName string
+ if h, err := os.Hostname(); err == nil {
+ host = h
+ if i := strings.Index(host, "."); i >= 0 {
+ host = host[:i]
+ }
+ }
+ if currentUser, err := user.Current(); err == nil {
+ userName = currentUser.Username
+ }
+ userName = strings.Replace(userName, `\`, "_", -1)
+ xformer.identifier = fmt.Sprintf("%s.%s.%s.tmp.%d.", filepath.Base(os.Args[0]), host, userName, os.Getpid())
+ }
+ return ioutil.TempDir(*dataDir, xformer.identifier)
+}
+
+func newResult(key map[string]string, rasterizerName, digest string) *goldingester.Result {
+ keyCopy := map[string]string{}
+ for k, v := range key {
+ keyCopy[k] = v
+ }
+ keyCopy["rasterizer"] = rasterizerName
+ options := map[string]string{"ext": PNG_EXT}
+ return &goldingester.Result{Key: keyCopy, Digest: digest, Options: options}
+}
+
+// processResult rasterizes a single PDF result and returns a set of new results.
+func (xformer *pdfXformer) processResult(res goldingester.Result) []*goldingester.Result {
+ rasterizedResults := []*goldingester.Result{}
+ resultMap, found := xformer.results[res.Digest]
+ if found {
+ // Skip rasterizion steps: big win.
+ for index, rasterizer := range xformer.rasterizers {
+ digest, ok := resultMap[index]
+ if ok {
+ rasterizedResults = append(rasterizedResults,
+ newResult(res.Key, rasterizer.String(), digest))
+ } else {
+ glog.Errorf("missing rasterizer %s on %s", rasterizer.String(), res.Digest)
+ }
+ }
+ return rasterizedResults
+ }
+
+ tempdir, err := xformer.makeTmpDir()
+ if err != nil {
+ glog.Errorf("error making temp directory: %s", err)
+ return rasterizedResults
+ }
+ defer util.RemoveAll(tempdir)
+ pdfPath := path.Join(tempdir, fmt.Sprintf("%s.pdf", res.Digest))
+ objectName := fmt.Sprintf("%s/%s.pdf", *storageImagesDirectory, res.Digest)
+ storageURL := fmt.Sprintf("gs://%s/%s", *storageBucket, objectName)
+ object, err := xformer.client.storageService.Objects.Get(*storageBucket, objectName).Do()
+ if err != nil {
+ glog.Errorf("unable to find %s: %s", storageURL, err)
+ return []*goldingester.Result{}
+ }
+ pdfData, _, err := gsFetch(object, xformer.client)
+ if err != nil {
+ glog.Errorf("unable to retrieve %s: %s", storageURL, err)
+ return []*goldingester.Result{}
+ }
+ err = writeTo(pdfPath, &pdfData)
+ if err != nil {
+ glog.Errorf("unable to write file %s: %s", pdfPath, err)
+ return []*goldingester.Result{}
+ }
+ if !isPDF(pdfPath) {
+ glog.Errorf("%s is not a PDF", objectName)
+ return []*goldingester.Result{}
+ }
+ resultMap = map[int]string{}
+ for index, rasterizer := range xformer.rasterizers {
+ digest, err := xformer.rasterizeOnce(pdfPath, index)
+ if err != nil {
+ glog.Errorf("rasterizer %s failed on %s.pdf: %s", rasterizer, res.Digest, err)
+ continue
+ }
+ rasterizedResults = append(rasterizedResults,
+ newResult(res.Key, rasterizer.String(), digest))
+ resultMap[index] = digest
+ }
+ xformer.results[res.Digest] = resultMap
+ return rasterizedResults
+}
+
+// processJsonFile reads a json file and produces a new json file
+// with rasterized results.
+func (xformer *pdfXformer) processJsonFile(jsonFileObject *storage.Object) {
+ jsonURL := fmt.Sprintf("gs://%s/%s", *storageBucket, jsonFileObject.Name)
+ if jsonFileObject.Metadata["rasterized"] == "true" {
+ glog.Infof("> > skipping %s (already processed) {%d}", jsonURL, xformer.counter)
+ return
+ }
+ body, length, err := gsFetch(jsonFileObject, xformer.client)
+ if err != nil {
+ glog.Errorf("Failed to fetch %s", jsonURL)
+ return
+ }
+ if 0 == length {
+ util.Close(body)
+ glog.Infof("> > skipping %s (empty file) {%d}", jsonURL, xformer.counter)
+ return
+ }
+ dmstruct := goldingester.DMResults{}
+ err = json.NewDecoder(body).Decode(&dmstruct)
+ util.Close(body)
+ if err != nil {
+ glog.Errorf("Failed to parse %s", jsonURL)
+ return
+ }
+ countPdfResults := 0
+ for _, res := range dmstruct.Results {
+ if res.Options["ext"] == PDF_EXT {
+ countPdfResults++
+ }
+ }
+ if 0 == countPdfResults {
+ glog.Infof("> > 0 PDFs found %s {%d}", jsonURL, xformer.counter)
+ xformer.setRasterized(jsonFileObject)
+ return
+ }
+
+ glog.Infof("> > processing %d pdfs of %d results {%d}", countPdfResults, len(dmstruct.Results), xformer.counter)
+ rasterizedResults := []*goldingester.Result{}
+ i := 0
+ for _, res := range dmstruct.Results {
+ if res.Options["ext"] == PDF_EXT {
+ i++
+ glog.Infof("> > > processing %s.pdf [%d/%d] {%d}", res.Digest, i, countPdfResults, xformer.counter)
+ rasterizedResults = append(rasterizedResults, xformer.processResult(*res)...)
+ }
+ }
+ newDMStruct := goldingester.DMResults{
+ BuildNumber: dmstruct.BuildNumber,
+ GitHash: dmstruct.GitHash,
+ Key: dmstruct.Key,
+ Results: rasterizedResults,
+ }
+ newJson, err := json.Marshal(newDMStruct)
+ if err != nil {
+ glog.Errorf("Unexpected json.Marshal error: %s", err)
+ return
+ }
+
+ now := time.Now()
+ // Change the date; leave most of the rest of the path components.
+ jsonPathComponents := strings.Split(jsonFileObject.Name, "/") // []string
+ if len(jsonPathComponents) < 4 {
+ fmt.Errorf("unexpected number of path components %q", jsonPathComponents)
+ return
+ }
+ jsonPathComponents = jsonPathComponents[len(jsonPathComponents)-4:]
+ jsonPathComponents[1] += "-pdfxformer"
+ jsonUploadPath := fmt.Sprintf("%s/%d/%02d/%02d/%02d/%s",
+ *storageJsonDirectory,
+ now.Year(),
+ int(now.Month()),
+ now.Day(),
+ now.Hour(),
+ strings.Join(jsonPathComponents, "/"))
+
+ _, err = uploadFile(xformer.client, bytes.NewReader(newJson), *storageBucket, jsonUploadPath, *accessControlEntity)
+ glog.Infof("> > wrote gs://%s/%s", *storageBucket, jsonUploadPath)
+ newJsonFileObject, err := xformer.client.storageService.Objects.Get(*storageBucket, jsonUploadPath).Do()
+ if err != nil {
+ glog.Errorf("Failed to find %s: %s", jsonUploadPath, err)
+ } else {
+ xformer.setRasterized(newJsonFileObject)
+ }
+ xformer.setRasterized(jsonFileObject)
+}
+
+// setRasterized sets the rasterized metadata flag of the given storage.Object
+func (xformer *pdfXformer) setRasterized(jsonFileObject *storage.Object) {
+ if nil == jsonFileObject.Metadata {
+ jsonFileObject.Metadata = map[string]string{}
+ }
+ jsonFileObject.Metadata["rasterized"] = "true"
+ _, err := xformer.client.storageService.Objects.Patch(*storageBucket, jsonFileObject.Name, jsonFileObject).Do()
+ if err != nil {
+ glog.Errorf("Failed to update metadata of %s: %s", jsonFileObject.Name, err)
+ } else {
+ glog.Infof("> > Updated metadata of %s", jsonFileObject.Name)
+ }
+}
+
+// processTimeRange calls gs.GetLatestGSDirs to get a list of
+func (xformer *pdfXformer) processTimeRange(start time.Time, end time.Time) {
+ glog.Infof("Processing time range: (%s, %s)", start.Truncate(time.Second), end.Truncate(time.Second))
+ for _, dir := range gs.GetLatestGSDirs(start.Unix(), end.Unix(), *storageJsonDirectory) {
+ glog.Infof("> Reading gs://%s/%s\n", *storageBucket, dir)
+ requestedObjects := xformer.client.storageService.Objects.List(*storageBucket).Prefix(dir).Fields(
+ "nextPageToken", "items/updated", "items/md5Hash", "items/mediaLink", "items/name", "items/metadata")
+ for requestedObjects != nil {
+ responseObjects, err := requestedObjects.Do()
+ if err != nil {
+ glog.Errorf("request %#v failed: %s", requestedObjects, err)
+ } else {
+ for _, jsonObject := range responseObjects.Items {
+ xformer.counter++
+ glog.Infof("> > Processing object: gs://%s/%s {%d}", *storageBucket, jsonObject.Name, xformer.counter)
+ xformer.processJsonFile(jsonObject)
+ }
+ }
+ if len(responseObjects.NextPageToken) > 0 {
+ requestedObjects.PageToken(responseObjects.NextPageToken)
+ } else {
+ requestedObjects = nil
+ }
+ }
+ }
+ glog.Infof("finished time range.")
+}
+
+// uploadErrorImage should be run once to verify that the image is there
+func (xformer *pdfXformer) uploadErrorImage(path string) error {
+ if "" == path {
+ glog.Fatalf("Missing --path argument")
+ }
+ errorImageMd5, err := md5OfFile(path)
+ if err != nil {
+ glog.Fatalf("Bad --path argument")
+ }
+ errorImageFileReader, err := os.Open(path)
+ if err != nil {
+ return err
+ }
+ defer util.Close(errorImageFileReader)
+ errorImagePath := fmt.Sprintf("%s/%s.png", *storageImagesDirectory, errorImageMd5)
+ _, err = uploadFile(xformer.client, errorImageFileReader, *storageBucket, errorImagePath, *accessControlEntity)
+ if err != nil {
+ return err
+ }
+ xformer.errorImageMd5 = errorImageMd5
+ return nil
+}
+
+func main() {
+ flag.Parse()
+ common.InitWithMetrics("pdfxform", graphiteServer)
+
+ client, err := getClient()
+ if err != nil {
+ glog.Fatal(err)
+ }
+ xformer := pdfXformer{
+ client: client,
+ results: map[string]map[int]string{},
+ }
+
+ err = xformer.uploadErrorImage(*failureImage)
+ if err != nil {
+ // If we can't upload this, we can't upload anything.
+ glog.Fatalf("Filed to upload error image: %s", err)
+ }
+
+ for _, rasterizer := range []pdf.Rasterizer{pdf.Pdfium{}, pdf.Poppler{}} {
+ if rasterizer.Enabled() {
+ xformer.rasterizers = append(xformer.rasterizers, rasterizer)
+ } else {
+ glog.Infof("rasterizer %s is disabled", rasterizer.String())
+ }
+ }
+ if len(xformer.rasterizers) == 0 {
+ glog.Fatalf("no rasterizers found")
+ }
+
+ end := time.Now()
+ start := end.Add(-172 * time.Hour)
+ xformer.processTimeRange(start, end)
+ glog.Flush() // Flush before waiting for next tick; it may be a while.
+ for _ = range time.Tick(time.Minute) {
+ start, end = end, time.Now()
+ xformer.processTimeRange(start, end)
+ glog.Flush()
+ }
+}
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