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-rw-r--r--bookpipeline/main.go343
1 files changed, 343 insertions, 0 deletions
diff --git a/bookpipeline/main.go b/bookpipeline/main.go
new file mode 100644
index 0000000..c1fb547
--- /dev/null
+++ b/bookpipeline/main.go
@@ -0,0 +1,343 @@
+package main
+// TODO: have logs go somewhere useful, like email
+// TODO: check if images are prebinarised and if so skip multiple binarisation
+
+import (
+ "errors"
+ "fmt"
+ "log"
+ "os"
+ "os/exec"
+ "path/filepath"
+ "strings"
+ "time"
+
+ "rescribe.xyz/go.git/preproc"
+)
+
+const usage = `Usage: bookpipeline [-v]
+
+Watches the preprocess, ocr and analyse queues for book names. When
+one is found this general process is followed:
+
+- The book name is hidden from the queue, and a 'heartbeat' is
+ started which keeps it hidden (this will time out after 2 minutes
+ if the program is terminated)
+- The necessary files from bookname/ are downloaded
+- The files are processed
+- The resulting files are uploaded to bookname/
+- The heartbeat is stopped
+- The book name is removed from the queue it was taken from, and
+ added to the next queue for future processing
+
+-v verbose
+`
+
+const training = "rescribealphav5" // TODO: allow to set on cmdline
+
+// null writer to enable non-verbose logging to be discarded
+type NullWriter bool
+func (w NullWriter) Write(p []byte) (n int, err error) {
+ return len(p), nil
+}
+
+const PauseBetweenChecks = 3 * time.Minute
+
+type Clouder interface {
+ Init() error
+ ListObjects(bucket string, prefix string) ([]string, error)
+ Download(bucket string, key string, fn string) error
+ Upload(bucket string, key string, path string) error
+ CheckQueue(url string) (Qmsg, error)
+ AddToQueue(url string, msg string) error
+ DelFromQueue(url string, handle string) error
+ QueueHeartbeat(t *time.Ticker, msgHandle string, qurl string) error
+}
+
+type Pipeliner interface {
+ Clouder
+ ListToPreprocess(bookname string) ([]string, error)
+ ListToOCR(bookname string) ([]string, error)
+ DownloadFromInProgress(key string, fn string) error
+ UploadToInProgress(key string, path string) error
+ CheckPreQueue() (Qmsg, error)
+ CheckOCRQueue() (Qmsg, error)
+ CheckAnalyseQueue() (Qmsg, error)
+ AddToOCRQueue(msg string) error
+ AddToAnalyseQueue(msg string) error
+ DelFromPreQueue(handle string) error
+ DelFromOCRQueue(handle string) error
+ PreQueueHeartbeat(t *time.Ticker, msgHandle string) error
+ OCRQueueHeartbeat(t *time.Ticker, msgHandle string) error
+ Logger() *log.Logger
+}
+
+type Qmsg struct {
+ Handle, Body string
+}
+
+func download(dl chan string, process chan string, conn Pipeliner, dir string, errc chan error) {
+ for key := range dl {
+ fn := filepath.Join(dir, filepath.Base(key))
+ err := conn.DownloadFromInProgress(key, fn)
+ if err != nil {
+ close(process)
+ errc <- err
+ return
+ }
+ process <- fn
+ }
+ close(process)
+}
+
+func up(c chan string, done chan bool, conn Pipeliner, bookname string, errc chan error) {
+ for path := range c {
+ name := filepath.Base(path)
+ key := filepath.Join(bookname, name)
+ err := conn.UploadToInProgress(key, path)
+ if err != nil {
+ errc <- err
+ return
+ }
+ }
+
+ done <- true
+}
+
+func preprocess(pre chan string, up chan string, logger *log.Logger, errc chan error) {
+ for path := range pre {
+ logger.Println("Preprocessing", path)
+ done, err := preproc.PreProcMulti(path, []float64{0.1, 0.2, 0.4, 0.5}, "binary", 0, true, 5, 30)
+ if err != nil {
+ close(up)
+ errc <- err
+ return
+ }
+ for _, p := range done {
+ up <- p
+ }
+ }
+ close(up)
+}
+
+// TODO: use Tesseract API rather than calling the executable
+func ocr(toocr chan string, up chan string, logger *log.Logger, errc chan error) {
+ for path := range toocr {
+ logger.Println("OCRing", path)
+ name := strings.Replace(path, ".png", "", 1) // TODO: handle any file extension
+ cmd := exec.Command("tesseract", "-l", training, path, name, "hocr")
+ err := cmd.Run()
+ if err != nil {
+ close(up)
+ errc <- errors.New(fmt.Sprintf("Error ocring %s: %s", path, err))
+ return
+ }
+ up <- name + ".hocr"
+ }
+ close(up)
+}
+
+func preprocBook(msg Qmsg, conn Pipeliner) error {
+ bookname := msg.Body
+
+ t := time.NewTicker(HeartbeatTime * time.Second)
+ go conn.PreQueueHeartbeat(t, msg.Handle)
+
+ d := filepath.Join(os.TempDir(), bookname)
+ err := os.MkdirAll(d, 0755)
+ if err != nil {
+ t.Stop()
+ return errors.New(fmt.Sprintf("Failed to create directory %s: %s", d, err))
+ }
+
+ dl := make(chan string)
+ pre := make(chan string)
+ upc := make(chan string)
+ done := make(chan bool)
+ errc := make(chan error)
+
+ // these functions will do their jobs when their channels have data
+ go download(dl, pre, conn, d, errc)
+ go preprocess(pre, upc, conn.Logger(), errc)
+ go up(upc, done, conn, bookname, errc)
+
+ conn.Logger().Println("Getting list of objects to download")
+ todl, err := conn.ListToPreprocess(bookname)
+ if err != nil {
+ t.Stop()
+ _ = os.RemoveAll(d)
+ return errors.New(fmt.Sprintf("Failed to get list of files for book %s: %s", bookname, err))
+ }
+ for _, d := range todl {
+ dl <- d
+ }
+ close(dl)
+
+ // wait for either the done or errc channel to be sent to
+ select {
+ case err = <-errc:
+ t.Stop()
+ _ = os.RemoveAll(d)
+ return err
+ case <-done:
+ }
+
+ conn.Logger().Println("Sending", bookname, "to OCR queue")
+ err = conn.AddToOCRQueue(bookname)
+ if err != nil {
+ t.Stop()
+ _ = os.RemoveAll(d)
+ return errors.New(fmt.Sprintf("Error adding to ocr queue %s: %s", bookname, err))
+ }
+
+ t.Stop()
+
+ conn.Logger().Println("Deleting original message from preprocessing queue")
+ err = conn.DelFromPreQueue(msg.Handle)
+ if err != nil {
+ _ = os.RemoveAll(d)
+ return errors.New(fmt.Sprintf("Error deleting message from preprocessing queue: %s", err))
+ }
+
+ err = os.RemoveAll(d)
+ if err != nil {
+ return errors.New(fmt.Sprintf("Failed to remove directory %s: %s", d, err))
+ }
+
+ return nil
+}
+
+// TODO: this is very similar to preprocBook; try to at least mostly merge them
+func ocrBook(msg Qmsg, conn Pipeliner) error {
+ bookname := msg.Body
+
+ t := time.NewTicker(HeartbeatTime * time.Second)
+ go conn.OCRQueueHeartbeat(t, msg.Handle)
+
+ d := filepath.Join(os.TempDir(), bookname)
+ err := os.MkdirAll(d, 0755)
+ if err != nil {
+ t.Stop()
+ return errors.New(fmt.Sprintf("Failed to create directory %s: %s", d, err))
+ }
+
+ dl := make(chan string)
+ ocrc := make(chan string)
+ upc := make(chan string)
+ done := make(chan bool)
+ errc := make(chan error)
+
+ // these functions will do their jobs when their channels have data
+ go download(dl, ocrc, conn, d, errc)
+ go ocr(ocrc, upc, conn.Logger(), errc)
+ go up(upc, done, conn, bookname, errc)
+
+ conn.Logger().Println("Getting list of objects to download")
+ todl, err := conn.ListToOCR(bookname)
+ if err != nil {
+ t.Stop()
+ _ = os.RemoveAll(d)
+ return errors.New(fmt.Sprintf("Failed to get list of files for book %s: %s", bookname, err))
+ }
+ for _, a := range todl {
+ dl <- a
+ }
+ close(dl)
+
+ // wait for either the done or errc channel to be sent to
+ select {
+ case err = <-errc:
+ t.Stop()
+ _ = os.RemoveAll(d)
+ return err
+ case <-done:
+ }
+
+ conn.Logger().Println("Sending", bookname, "to analyse queue")
+ err = conn.AddToAnalyseQueue(bookname)
+ if err != nil {
+ t.Stop()
+ _ = os.RemoveAll(d)
+ return errors.New(fmt.Sprintf("Error adding to analyse queue %s: %s", bookname, err))
+ }
+
+ t.Stop()
+
+ conn.Logger().Println("Deleting original message from OCR queue")
+ err = conn.DelFromOCRQueue(msg.Handle)
+ if err != nil {
+ _ = os.RemoveAll(d)
+ return errors.New(fmt.Sprintf("Error deleting message from OCR queue: %s", err))
+ }
+
+ err = os.RemoveAll(d)
+ if err != nil {
+ return errors.New(fmt.Sprintf("Failed to remove directory %s: %s", d, err))
+ }
+
+ return nil
+}
+
+func main() {
+ var verboselog *log.Logger
+ if len(os.Args) > 1 {
+ if os.Args[1] == "-v" {
+ verboselog = log.New(os.Stdout, "", log.LstdFlags)
+ } else {
+ log.Fatal(usage)
+ }
+ } else {
+ var n NullWriter
+ verboselog = log.New(n, "", log.LstdFlags)
+ }
+
+ var conn Pipeliner
+ conn = &awsConn{ region: "eu-west-2", logger: verboselog }
+
+ verboselog.Println("Setting up AWS session")
+ err := conn.Init()
+ if err != nil {
+ log.Fatalln("Error setting up cloud connection:", err)
+ }
+ verboselog.Println("Finished setting up AWS session")
+
+ var checkPreQueue <-chan time.Time
+ var checkOCRQueue <-chan time.Time
+ checkPreQueue = time.After(0)
+ checkOCRQueue = time.After(0)
+
+ for {
+ select {
+ case <- checkPreQueue:
+ msg, err := conn.CheckPreQueue()
+ checkPreQueue = time.After(PauseBetweenChecks)
+ if err != nil {
+ log.Println("Error checking preprocess queue", err)
+ continue
+ }
+ if msg.Handle == "" {
+ verboselog.Println("No message received on preprocess queue, sleeping")
+ continue
+ }
+ err = preprocBook(msg, conn)
+ if err != nil {
+ log.Println("Error during preprocess", err)
+ }
+ case <- checkOCRQueue:
+ msg, err := conn.CheckOCRQueue()
+ checkOCRQueue = time.After(PauseBetweenChecks)
+ if err != nil {
+ log.Println("Error checking OCR queue", err)
+ continue
+ }
+ if msg.Handle == "" {
+ verboselog.Println("No message received on OCR queue, sleeping")
+ continue
+ }
+ err = ocrBook(msg, conn)
+ if err != nil {
+ log.Println("Error during OCR process", err)
+ }
+ }
+ }
+}