Add unstickocr tool, until the heartbeat bug is eliminated

1 files changed, 114 insertions, 0 deletions

diff --git a/cmd/unstickocr/main.go b/cmd/unstickocr/main.go
new file mode 100644
index 0000000..2b0bb24
--- /dev/null
+++ b/cmd/unstickocr/main.go
@@ -0,0 +1,114 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"time"
+
+	"rescribe.xyz/bookpipeline"
+)
+
+const usage = `Usage: unstickocr [-v] bookname
+
+unstickocr deletes a book from the OCR queue and adds it to the
+Analyse queue.
+
+This should be done automatically by the bookpipeline tool once
+the OCR job has completed, but sometimes it isn't, because of a
+nasty bug. Once that bug is squashed, this tool can be deleted.
+`
+
+// 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
+}
+
+type UnstickPipeliner interface {
+	Init() error
+	CheckQueue(url string, timeout int64) (bookpipeline.Qmsg, error)
+	AddToQueue(url string, msg string) error
+	DelFromQueue(url string, handle string) error
+	OCRQueueId() string
+	AnalyseQueueId() string
+}
+
+func main() {
+	verbose := flag.Bool("v", false, "verbose")
+	flag.Usage = func() {
+		fmt.Fprintf(flag.CommandLine.Output(), usage)
+		flag.PrintDefaults()
+	}
+	flag.Parse()
+
+	if flag.NArg() != 1 {
+		flag.Usage()
+		return
+	}
+
+	var verboselog *log.Logger
+	if *verbose {
+		verboselog = log.New(os.Stdout, "", 0)
+	} else {
+		var n NullWriter
+		verboselog = log.New(n, "", 0)
+	}
+
+	var conn UnstickPipeliner
+	conn = &bookpipeline.AwsConn{Region: "eu-west-2", Logger: verboselog}
+
+	err := conn.Init()
+	if err != nil {
+		log.Fatalln("Error setting up cloud connection:", err)
+	}
+
+	book := flag.Arg(0)
+	done := false
+
+	for a := 0; a < 5; a++ {
+		for i := 0; i < 10; i++ {
+			verboselog.Println("Checking OCR queue for", book)
+			msg, err := conn.CheckQueue(conn.OCRQueueId(), 10)
+			if err != nil {
+				log.Fatalln("Error checking OCR queue:", err)
+				continue
+			}
+			if msg.Handle == "" {
+				verboselog.Println("No message received on OCR queue")
+				continue
+			}
+			if msg.Body != book {
+				verboselog.Println("Message received on OCR queue is not the one we're",
+					"looking for, so will try again - found", msg.Body)
+				continue
+			}
+			err = conn.DelFromQueue(conn.OCRQueueId(), msg.Handle)
+			if err != nil {
+				log.Fatalln("Error deleting message from OCR queue:", err)
+			}
+			err = conn.AddToQueue(conn.AnalyseQueueId(), book)
+			if err != nil {
+				log.Fatalln("Error adding message to Analyse queue:", err)
+			}
+			done = true
+			break
+		}
+		if done == true {
+			break
+		}
+		log.Println("No message found yet, sleeping for 30 seconds to try again")
+		time.Sleep(30)
+	}
+
+	if done == true {
+		fmt.Println("Succeeded moving message from OCR queue to Analyse queue.")
+	} else {
+		log.Fatalln("Failed to find message", book, "on OCR queue; is it still being processed?",
+			"It can only be discovered and processed by this tool when it is available.",
+			"Try shutting down any instance that is using it, waiting a few minutes,",
+			"and rerunning this tool.")
+	}
+}