# -*- coding: utf-8 -*-
#!/usr/bin/python

import pymysql
import hashlib
import json
import urllib.request
import base64
import time
import datetime
import redis
import os
import sys
import functools

CONFIG_DIR = './'
context = {
    'channel': 0,
    'dbname_prefix': ''
}

def scanKeys(r, key_prefix, matched_keys):
    scan_key = key_prefix + '*'
    keys = []
    cursor, keys = r.scan(0, scan_key, 1000)
    scan_count = 0
    while cursor != 0 or len(keys) > 0:
        for key in keys:
            matched_keys[key] = key
        #end
        keys = []
        if cursor != 0:
            cursor, keys = r.scan(cursor, scan_key, 1000)
        scan_count += 1
        if scan_count > 10000:
            break
    #end while cursor

def saveKeys(r, keys, curr_file):
    for key in keys:
        data = r.get(key)
        expire = r.ttl(key)
        curr_file.write(json.dumps(
            {
                'cmd': 'set',
                'key': key,
                'data':data
            }
        ) + '\n')
        curr_file.write(json.dumps(
            {
                'cmd': 'expire',
                'key': key,
                'time': expire
            }
        ) + '\n')
        if expire < 0:
            print('[ERROR] ' + key + ' ttl < 0')
        if expire > 3600 * 24:
            print('[ERROR] ' + key + ' ttl > 3600 * 24')

def exportRedis(context, redis_conf, redis_rule_conf):
    curr_file = open(context['out_dir'] + context['channel'] + '.redis', 'w')
    for conf in redis_conf:
        r = redis.Redis(host = conf['host'],
                        port = conf['port'],
                        password = conf['passwd'],
                        decode_responses = True
        )
        for rule in redis_rule_conf:
            matched_keys = {}
            scanKeys(r, rule['key_prefix'], matched_keys)
            saveKeys(r, matched_keys, curr_file)
    #end for conf

def exportMysql(context, db_conf, db_rule_conf):
    dbsh_file = open(context['out_dir'] + context['channel'] + '.sh', 'w')
    for conf in db_conf:
        for rule in db_rule_conf:
            line = ''
            if rule['where'] == '':
                line = 'mysqldump -h %s -P %d -u%s -p%s %s %s > %s.sql' % (
                    conf['host'],
                    conf['port'],
                    conf['user'],
                    conf['passwd'],
                    context['dbname_prefix'] + str(conf['instance_id']),
                    rule['table_name'],
                    rule['table_name']
                )
            else:
                line = 'mysqldump -h %s -P %d -u%s -p%s %s %s --where="%s"> %s.sql' % (
                    conf['host'],
                    conf['port'],
                    conf['user'],
                    conf['passwd'],
                    context['dbname_prefix'] + str(conf['instance_id']),
                    rule['table_name'],
                    rule['where'].replace('$channel', context['channel']),
                    rule['table_name']
                )
            dbsh_file.write(line + "\n")

def main():
    global context
    if not os.path.exists(CONFIG_DIR + 'out/'):
        os.mkdir(CONFIG_DIR + 'out/')
    if not os.path.exists(CONFIG_DIR + 'out/' + context['channel']):
        os.mkdir(CONFIG_DIR + 'out/' + context['channel'])
    context['out_dir'] = CONFIG_DIR + 'out/' + context['channel'] + '/'
    db_conf = json.loads(open(CONFIG_DIR + context['channel'] + '/mysql.json', 'r').read())
    redis_conf = json.loads(open(CONFIG_DIR + context['channel'] + '/redis.json', 'r').read())
    db_rule_conf = json.loads(open(CONFIG_DIR + 'common/mysql_rule.json', 'r').read())
    redis_rule_conf = json.loads(open(CONFIG_DIR + 'common/redis_rule.json', 'r').read())
    exportRedis(context, redis_conf, redis_rule_conf)
    exportMysql(context, db_conf, db_rule_conf)

if __name__ == "__main__":
    context['channel'] = sys.argv[1]
    context['dbname_prefix'] = sys.argv[2]
    main()