#!/usr/bin/python

import os, sys, time
import sql.db
from sql.util import new_cursor, get_dbs, db_backup_pre, db_backup_mkdir
from Queue import Queue, Empty
import threading
import subprocess

MYSQLDUMP_ARGS = ['--compact', '--add-drop-table', '--add-locks',
    '--create-options', '--disable-keys', '--dump-date',
    '--extended-insert', '--quick',
    '--no-autocommit', '--quote-names', '--routines',
    '--single-transaction', '--triggers', '--force']

finished = False
queue = Queue()

def consumer():
    while True:
        try:
            next = queue.get(timeout=3)
            print next[0] + ':',
            log = sql.db.Backup.get_by(db=next[0])
            if not log:
                log = sql.db.Backup(db=next[0])
            log.dump_path = next[1]
            log.dump_date = sql.db.func.now()
            db_backup_mkdir(next[1])
            args = ['mysqldump', next[0]]
            args.extend(MYSQLDUMP_ARGS)
            p0 = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
            p1 = subprocess.Popen(['gzip'], stdin=p0.stdout, stdout=file(next[1], 'w+'))
            p1.wait()
            err = p0.stderr.read()
            if len(err):
                log.dump_errnum = p0.returncode
                log.dump_errstr = err
            else:
                log.dump_errnum = None
                log.dump_errstr = None
            log.save_or_update()
            sql.db.session.flush()
            print 'Done'
        except (KeyboardInterrupt, SystemExit):
            break
        except Empty:
            if finished:
                break

t_consumer = threading.Thread(target=consumer)
t_consumer.start()

def producer():
    c = new_cursor('mysqldump')
    for db in get_dbs(c):
        log = sql.db.Backup.get_by(db=db)
        if not log:
            log = sql.db.Backup(db=db)
        elif log.skip_date:
            if time.mktime(log.skip_date.timetuple()) + 3600 > time.time():
                # never recheck a db skipped in the past hour
                continue
        d = db_backup_pre(c, db)
        if d[0]:
            queue.put((db, d[1]))
            log.skip_reason = None
            log.skip_date = None
        else:
            log.skip_reason = d[1]
            log.skip_date = sql.db.func.now()
        log.save_or_update()
        #sql.db.session.flush()

try:
    producer()
except KeyboardInterrupt:
    sys.exit(1)
finally:
    finished = True