#!/usr/bin/env python 
# coding:utf-8 
__author__ = 'John' 
 

import MySQLdb 
import sys 
import datetime 
import time 
 
class ClassMigrate(object): 
  def _get_argv(self): 
    self.usage = """ 
      usage(): 
      python daily_migration.py --source=192.168.1.4:3306/db_name:tab_name/proxy/password \\ 
                    --dest=192.168.1.150:13301/db_name_archive:tab_name_201601/proxy/password \\ 
                    --delete_strategy=delete --primary_key=auto_id --date_col=ut --time_interval=180 
      """ 
    if len(sys.argv) == 1: 
      print self.usage 
      sys.exit(1) 
    elif sys.argv[1] == '--help' or sys.argv[1] == '-h': 
        print self.usage 
        sys.exit() 
    elif len(sys.argv) > 2: 
      for i in sys.argv[1:]: 
        _argv = i.split('=') 
        if _argv[0] == '--source': 
          _list = _argv[1].split('/') 
          self.source_host = _list[0].split(':')[0] 
          self.source_port = int(_list[0].split(':')[1]) 
          self.source_db = _list[1].split(':')[0] 
          self.source_tab = _list[1].split(':')[1] 
          self.source_user = _list[2] 
          self.source_password = _list[3] 
        elif _argv[0] == '--dest': 
          _list = _argv[1].split('/') 
          self.dest_host = _list[0].split(':')[0] 
          self.dest_port = int(_list[0].split(':')[1]) 
          self.dest_db = _list[1].split(':')[0] 
          self.dest_tab = _list[1].split(':')[1] 
          self.dest_user = _list[2] 
          self.dest_password = _list[3] 
        elif _argv[0] == '--delete_strategy': 
          self.deleteStrategy = _argv[1] 
          if self.deleteStrategy not in ('delete', 'drop'): 
            print (self.usage) 
            sys.exit(1) 
        elif _argv[0] == '--primary_key': 
          self.pk = _argv[1] 
        elif _argv[0] == '--date_col': 
          self.date_col = _argv[1] 
        elif _argv[0] == '--time_interval': 
          self.interval = _argv[1] 
        else: 
          print (self.usage) 
          sys.exit(1) 
 
  def __init__(self): 
    self._get_argv() 
## -------------------------------------------------------------------- 
    self.sourcedb_conn_str = MySQLdb.connect(host=self.source_host, port=self.source_port, user=self.source_user, passwd=self.source_password, db=self.source_db, charset='utf8') 
    self.sourcedb_conn_str.autocommit(True) 
    self.destdb_conn_str = MySQLdb.connect(host=self.dest_host, port=self.dest_port, user=self.dest_user, passwd=self.dest_password, db=self.dest_db, charset='utf8') 
    self.destdb_conn_str.autocommit(True) 
## -------------------------------------------------------------------- 
    self.template_tab = self.source_tab + '_template' 
    self.step_size = 20000 
## -------------------------------------------------------------------- 
    self._migCompleteState = False 
    self._deleteCompleteState = False 
## -------------------------------------------------------------------- 
    self.source_cnt = '' 
    self.source_min_id = '' 
    self.source_max_id = '' 
    self.source_checksum = '' 
    self.dest_cn = '' 
## -------------------------------------------------------------------- 
    self.today = time.strftime("%Y-%m-%d") 
    # self.today = '2016-05-30 09:59:40' 

def sourcedb_query(self, sql, sql_type): 
    try: 
      cr = self.sourcedb_conn_str.cursor() 
      cr.execute(sql) 
      if sql_type == 'select': 
        return cr.fetchall() 
      elif sql_type == 'dml': 
        rows = self.sourcedb_conn_str.affected_rows() 
        return rows 
      else: 
        return True 
    except Exception, e: 
      print (str(e) + "<br>") 
      return False 
    finally: 
      cr.close() 

  def destdb_query(self, sql, sql_type, values=''): 
    try: 
      cr = self.destdb_conn_str.cursor() 
      if sql_type == 'select': 
        cr.execute(sql) 
        return cr.fetchall() 
      elif sql_type == 'insertmany': 
        cr.executemany(sql, values) 
        rows = self.destdb_conn_str.affected_rows() 
        return rows 
      else: 
        cr.execute(sql) 
        return True 
    except Exception, e: 
      print (str(e) + "<br>") 
      return False 
    finally: 
      cr.close() 
 
 def create_table_from_source(self): 
    '''''因為tab_name表的數據需要遷移到archive引擎表，所以不適合使用這種方式。 預留作其他用途。''' 
    try: 
      sql = "show create table %s;" % self.source_tab 
      create_str = self.sourcedb_query(sql, 'select')[0][1] 
      create_str = create_str.replace('CREATE TABLE', 'CREATE TABLE IF NOT EXISTS') 
      self.destdb_query(create_str, 'ddl') 
      return True 
    except Exception, e: 
      print (str(e) + "<br>") 
      return False 

  def create_table_from_template(self): 
    try: 
      sql = 'CREATE TABLE IF NOT EXISTS %s like %s;' % (self.dest_tab, self.template_tab) 
      state = self.destdb_query(sql, 'ddl') 
      if state: 
        return True 
      else: 
        return False 
    except Exception, e: 
      print (str(e + "<br>") + "<br>") 
      return False 

  def get_min_max(self): 
    """ 創建目標表、并獲取源表需要遷移的總條數、最小id、最大id """ 
    try: 
      print ("\nStarting Migrate at -- %s <br>") % (datetime.datetime.now().__str__()) 
      sql = """select count(*),IFNULL(min(%s),-1),IFNULL(max(%s),-1) from %s where %s >= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 00:00:00') \ 
           and %s <= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 23:59:59') """ \ 
            % (self.pk, self.pk, self.source_tab, self.date_col, self.today, self.interval, self.date_col, self.today, self.interval) 
      q = self.sourcedb_query(sql, 'select') 
      self.source_cnt = q[0][0] 
      self.source_min_id = q[0][1] 
      self.source_max_id = q[0][2] 
      self.source_checksum = str(self.source_cnt) + '_' + str(self.source_min_id) + '_' + str(self.source_max_id) 
      if self.source_cnt == 0 or self.source_min_id == -1 or self.source_max_id == -1: 
        print ("There is 0 record in source table been matched! <br>") 
        return False 
      else: 
        return True 
    except Exception, e: 
      print (str(e) + "<br>") 
      return False 
 
  def migrate_2_destdb(self): 
    try: 
      get_min_max_id = self.get_min_max() 
      if get_min_max_id: 
        k = self.source_min_id 
        desc_sql = "desc %s;" % self.source_tab 
        # self.filed = [] 
        cols = self.sourcedb_query(desc_sql, 'select') 
        # for j in cols: 
        #   self.filed.append(j[0]) 
        fileds = "%s," * len(cols) # 源表有多少個字段，就拼湊多少個%s，拼接到insert語句 
        fileds = fileds.rstrip(',') 
        while k <= self.source_max_id: 
          sql = """select * from %s where %s >= %d and %s< %d \ 
               and %s >= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 00:00:00') \ 
               and %s <= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 23:59:59') """\ 
             % (self.source_tab, self.pk, k, self.pk, k+self.step_size, self.date_col, self.today, self.interval, self.date_col, self.today, self.interval) 
          print ("\n%s <br>") % sql 
          starttime = datetime.datetime.now() 
          results = self.sourcedb_query(sql, 'select') 
          insert_sql = "insert into " + self.dest_tab + " values (%s)" % fileds 
          rows = self.destdb_query(insert_sql, 'insertmany', results) 
          if rows == False: 
            print ("Insert failed!! <br>") 
          else: 
            print ("Inserted %s rows. <br>") % rows 
          endtime = datetime.datetime.now() 
          timeinterval = endtime - starttime 
          print("Elapsed :" + str(timeinterval.seconds) + '.' + str(timeinterval.microseconds) + " seconds <br>") 
          k += self.step_size 
        print ("\nInsert complete at -- %s <br>") % (datetime.datetime.now().__str__()) 
        return True 
      else: 
        return False 
    except Exception, e: 
      print (str(e) + "<br>") 
      return False 
  
  def verify_total_cnt(self): 
    try: 
      sql = """select count(*),IFNULL(min(%s),-1),IFNULL(max(%s),-1) from %s where %s >= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 00:00:00') \ 
           and %s <= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 23:59:59') """ \ 
            % (self.pk, self.pk, self.dest_tab, self.date_col, self.today, self.interval, self.date_col, self.today, self.interval) 
      dest_result = self.destdb_query(sql, 'select') 
      self.dest_cnt = dest_result[0][0] 
      dest_checksum = str(self.dest_cnt) + '_' + str(dest_result[0][1]) + '_' + str(dest_result[0][2]) 
      print ("source_checksum: %s, dest_checksum: %s <br>") % (self.source_checksum, dest_checksum) 
      if self.source_cnt == dest_result[0][0] and dest_result[0][0] != 0 and self.source_checksum == dest_checksum: 
        self._migCompleteState = True 
        print ("Verify successfully !!<br>") 
      else: 
        print ("Verify failed !!<br>") 
        sys.exit(77) 
    except Exception, e: 
      print (str(e) + "<br>") 
  
  def drop_daily_partition(self): 
    try: 
      if self._migCompleteState: 
        sql = """explain partitions select * from %s where %s >= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 00:00:00') 
               and %s <= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 23:59:59') """\ 
             % (self.source_tab, self.date_col, self.today, self.interval, self.date_col, self.today, self.interval) 
        partition_name = self.sourcedb_query(sql, 'select') 
        partition_name = partition_name[0][3] 
 
 
 
 
        sql = """select count(*),IFNULL(min(%s),-1),IFNULL(max(%s),-1) from %s partition (%s)""" \ 
            % (self.pk, self.pk, self.source_tab, partition_name) 
        q = self.sourcedb_query(sql, 'select') 
        source_cnt = q[0][0] 
        source_min_id = q[0][1] 
        source_max_id = q[0][2] 
        checksum = str(source_cnt) + '_' + str(source_min_id) + '_' + str(source_max_id) 
        if source_cnt == 0 or source_min_id == -1 or source_max_id == -1: 
          print ("There is 0 record in source PARTITION been matched! <br>") 
        else: 
          if checksum == self.source_checksum: 
            drop_par_sql = "alter table %s drop partition %s;" % (self.source_tab, partition_name) 
            droped = self.sourcedb_query(drop_par_sql, 'ddl') 
            if droped: 
              print (drop_par_sql + " <br>") 
              print ("\nDrop partition complete at -- %s <br>") % (datetime.datetime.now().__str__()) 
              self._deleteCompleteState = True 
            else: 
              print (drop_par_sql + " <br>") 
              print ("Drop partition failed.. <br>") 
          else: 
            print ("The partition %s checksum failed !! Drop failed !!") % partition_name 
            sys.exit(77) 
    except Exception, e: 
      print (str(e) + "<br>") 
 
  def delete_data(self): 
    try: 
      if self._migCompleteState: 
        k = self.source_min_id 
        while k <= self.source_max_id: 
          sql = """delete from %s where %s >= %d and %s< %d \ 
               and %s >= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 00:00:00') \ 
               and %s <= CONCAT(DATE_FORMAT(DATE_ADD('%s', INTERVAL -%s day),'%%Y-%%m-%%d'), ' 23:59:59') """ \ 
             % (self.source_tab, self.pk, k, self.pk, k+self.step_size, self.date_col, self.today, self.interval, self.date_col, self.today, self.interval) 
          print ("\n%s <br>") % sql 
          starttime = datetime.datetime.now() 
          rows = self.sourcedb_query(sql, 'dml') 
          if rows == False: 
            print ("Delete failed!! <br>") 
          else: 
            print ("Deleted %s rows. <br>") % rows 
          endtime = datetime.datetime.now() 
          timeinterval = endtime - starttime 
          print("Elapsed :" + str(timeinterval.seconds) + '.' + str(timeinterval.microseconds) + " seconds <br>") 
          time.sleep(1) 
          k += self.step_size 
        print ("\nDelete complete at -- %s <br>") % (datetime.datetime.now().__str__()) 
        self._deleteCompleteState = True 
    except Exception, e: 
      print (str(e) + "<br>") 
       
  def do(self): 
    tab_create = self.create_table_from_template() 
    if tab_create: 
      migration = self.migrate_2_destdb() 
      if migration: 
        self.verify_total_cnt() 
        if self._migCompleteState: 
          if self.deleteStrategy == 'drop': 
            self.drop_daily_partition() 
          else: 
            self.delete_data() 
          print ("\n<br>") 
          print ("====="*5 + '<br>') 
          print ("source_total_cnt: %s <br>") % self.source_cnt 
          print ("dest_total_cnt: %s <br>") % self.dest_cnt 
          print ("====="*5 + '<br>') 
          if self._deleteCompleteState: 
            print ("\nFinal result: Successfully !! <br>") 
            sys.exit(88) 
          else: 
            print ("\nFinal result: Failed !! <br>") 
            sys.exit(254) 
    else: 
      print ("Create table failed ! Exiting. . .") 
      sys.exit(255) 
  
f = ClassMigrate() 
f.do()