media-sucker/src/reader.py

#! /usr/bin/python3

import os
import threading
import subprocess
import time
import re
import fcntl
import traceback
import json 
import logging
import dvd

CDROM_DRIVE_STATUS = 0x5326
CDS_NO_INFO = 0
CDS_NO_DISC = 1
CDS_TRAY_OPEN = 2
CDS_DRIVE_NOT_READ = 3
CDS_DISC_OK = 4
CDS_STR = ["no info", "no disc", "tray open", "drive not read", "disc ok"]

CDROM_DISC_STATUS = 0x5327
CDS_AUDIO = 100
CDS_DATA_1 = 101
CDS_DATA_2 = 102

CDROM_LOCKDOOR = 0x5329
CDROM_EJECT = 0x5309

class Reader(threading.Thread):
    def __init__(self, device, directory=None, **kwargs):
        self.device = device
        self.directory = directory
        self.status = {
            "type": "reader",
            "state": "idle",
            "device": self.device,
        }
        self.complete = 0
        self.staleness = 0
        self.drive = None
        logging.info("Starting reader on %s" % self.device)
        return super().__init__(**kwargs)

    def reopen(self):
        if (self.staleness > 15) or not self.drive:
            self.drive = None # Close existing
            try:
                self.drive = os.open(self.device, os.O_RDONLY | os.O_NONBLOCK)
                logging.info("Reopened %s" % self.device)
            except FileNotFoundError:
                pass
            self.staleness = 0
        else:
            self.staleness += 1

    def run(self):
        while True:
            self.status["state"] = "idle"
            self.reopen()
            if not self.drive:
                time.sleep(30)
                continue
            rv = fcntl.ioctl(self.drive, CDROM_DRIVE_STATUS)
            if rv == CDS_DISC_OK:
                rv = fcntl.ioctl(self.drive, CDROM_DISC_STATUS)
                try:
                    if rv == CDS_AUDIO:
                        self.handle_audio()
                    elif rv in [CDS_DATA_1, CDS_DATA_2]:
                        self.handle_data()
                    else:
                        logging.info("Can't handle disc type %d" % rv)
                except Exception as e:
                    logging.error("Error in disc handler: %s" % e)
                    logging.error(traceback.format_exc())
                self.eject()
            elif rv == CDS_TRAY_OPEN:
                time.sleep(3)
            else:
                logging.info("CDROM_DRIVE_STATUS: %d (%s)" % (rv, CDS_STR[rv]))
                time.sleep(3)
    
    def eject(self):
        self.status["state"] = "ejecting"

        for i in range(20):
            try:
                fcntl.ioctl(self.drive, CDROM_LOCKDOOR, 0)
                fcntl.ioctl(self.drive, CDROM_EJECT)
                return
            except Exception as e:
                logging.error("Ejecting: %v" % e)
                time.sleep(i * 5)

    def finished(self, **kwargs):
        self.status["state"] = "finished read"
        fn = os.path.join(self.directory, self.status["title"], "sucker.json")
        newfn = fn + ".new"
        with open(newfn, "w") as fout:
            json.dump(obj=self.status, fp=fout)
        os.rename(src=newfn, dst=fn)

    def handle_audio(self):
        pass # XXX

    def handle_data(self):
        self.status["video"] = True
        src = dvd.Copier(self.device, self.status)
        src.copy(self.directory)
        self.finished()

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