实习第一周——UpYunUprSync——Sqlite版本

先用Sqlite做一个版本，Sqlite是一个关系型的嵌入式数据库，可以支持复杂的数据库逻辑，但是，相对的效率也不是很nice，而这里要用到的数据逻辑并不复杂，因此可以使用KV数据库，改进版本是使用了Redies 这一NoSql数据库，但Redies需要在使用机上开启监听端口，因此也不是很适合，最后改用了LevelDB，效率较Sqlite提高了20倍左右。

__author__ = 'glcsnz123'
# -*- coding: utf-8 -*-
import time,os,datetime
import thread,sys,signal
import sqlite3
import logging,atexit
import upyun
import Queue


class EmptyLogger:
 def error(self,st):
 pass

 def debug(self,st):
 pass

 def info(self,st):
 pass

 def warning(self,st):
 pass

#------------LOG CONFIG-----------------
LOGGER = EmptyLogger()
__LOGLEVEL = logging.INFO
LOGFILE = "/tmp/UpYunSync.log"
#--------------------------------------

def InitLogger():
 global LOGGER,LOGFILE,__LOGLEVEL
 if __LOGLEVEL == logging.CRITICAL or not os.access(os.path.dirname(LOGFILE),os.W_OK):
 LOGGER = EmptyLogger()
 return
 LOGGER = logging.getLogger()
 hdlr = logging.FileHandler(LOGFILE)
 formatter = logging.Formatter('%(asctime)s %(levelname)s %(message)s')
 hdlr.setFormatter(formatter)
 LOGGER.addHandler(hdlr)
 LOGGER.setLevel(__LOGLEVEL)


def SetLoggerLevel(loglevel=""):#DEBUG < INFO < WARNING < ERROR < OFF
 global __LOGLEVEL
 if loglevel.upper() == "INFO":
 LOGLEVEL = logging.INFO
 elif loglevel.upper() == "WARNING":
 LOGLEVEL = logging.WARNING
 elif loglevel.upper() == "ERROR":
 LOGLEVEL = logging.ERROR
 elif loglevel.upper() == "DEBUG":
 LOGLEVEL = logging.DEBUG
 elif loglevel.upper() == "OFF":
 LOGLEVEL = logging.CRITICAL
 else:
 LOGLEVEL = logging.NOTSET


def getLastModifyTime(pathname):#获取最后一次修改时间
 if os.path.isfile(pathname) or os.path.isdir(pathname): #如果存在该文件的话
 return (datetime.datetime.fromtimestamp(os.path.getmtime(pathname))).strftime("%F %X")
 return (datetime.datetime.fromtimestamp(0)).strftime("%F %X")


class UpYunUprSync:
 def __init__(self,BUCKETNAME='uprsyncx',USERNAME='admin',PASSWORD='adminadmin',SRC_DIR="/home/glcsnz123/Django-1.5.4",DST_DIR="/zlssasj",DBFILENAME=".UpYunSqlite.db"):
 if SRC_DIR.endswith(os.sep):
 SRC_DIR = SRC_DIR[0:-1:1]
 if DST_DIR.endswith(os.sep):
 DST_DIR = DST_DIR[0:-1:1]

 self.__BUCKETNAME = BUCKETNAME
 self.__USERNAME = USERNAME
 self.__PASSWORD = PASSWORD
 self.__SRC_DIR = SRC_DIR
 self.__DST_DIR = DST_DIR
 self.__HEADERS = {"x-gmkerl-rotate": "180"}
 self.__DBFILENAME = DBFILENAME
 self.__WORKER_LIMIT = 10
 self.__ErrorFileList = []
 self.__mkdirList = []

 # 初始化sqlites
 self.__SQLites = UpYunSqlite(self.__SRC_DIR,self.__DBFILENAME)
 # daemon 配置信息
 self.pidfile = "/tmp/uprsync.pid"
 self.stdout = "/dev/null"
 self.stderr = "/dev/null"

 def setThreadNumLimit(self,T_Limit):
 self.__WORKER_LIMIT = max(1,T_Limit)

 def __getFileList(self,fpath):
 start = datetime.datetime.now()
 if fpath.endswith(os.sep):
 pathStack = [fpath[0:-1:1]]
 else:
 pathStack = [fpath]

 self.__DFS_FINISHED = False
 self.__JobFileList = Queue.Queue(100000) #用来存放需要上传的文件的路径
 self.__JobPathList = Queue.Queue() #用来存放需要创建的目录
 dirList = []
 #初始化目录
 try:
 tmpList = os.listdir(fpath)
 except OSError,e:
 print "[ERROR]Permission Denied!n " + fpath,"n"
 LOGGER.error("[ERROR]Permission Denied!n " + fpath + "nn")
 self.__DFS_FINISHED = True
 return
 if self.__DST_DIR != "":
 self.__CilentUp.mkdir(self.__DST_DIR)
 currentDir = os.sep.join(pathStack)
 SqlPathList = self.__SQLites.getPathFromSQL(currentDir)
 SqlFileList = self.__SQLites.getFileFromSQL(currentDir)
 for filename in tmpList:
 fullname = os.sep.join(pathStack) + os.sep + filename
 if os.path.isdir(fullname):
 if SqlPathList.has_key(filename) == False:
 self.__JobPathList.put(fullname)
 dirList.append(filename)
 elif os.path.islink(fullname):
 print "[WARNING]file:",fullname,"is a symbol link filen"
 LOGGER.warning(fullname.join(["[WARNING]file: "," is a symbol link filenn"]))
 elif filename == self.__DBFILENAME:#数据库文件，不做任何处理！
 continue
 else:
 if SqlFileList.has_key(filename) == False:
 res = 1
 elif SqlFileList[filename] == getLastModifyTime(fullname):
 print "[DEBUG]file:"," is not modifiedn"
 LOGGER.debug(fullname.join(["[DEBUG]file: "," is not modifiednn"]))
 continue
 else:
 res = 0
 self.__JobFileList.put((fullname,res),block=True)

 while dirList.__len__() > 0:
 if dirList[-1] == "":
 pathStack.pop()
 dirList.pop()
 continue
 try:
 tmpList = os.listdir(os.sep.join(pathStack) + os.sep + dirList[-1])
 except:
 print "[ERROR]Permission Denied!n" + os.sep.join(pathStack) + os.sep + dirList[-1] + "n"
 LOGGER.error("[ERROR]Permission Denied!n" + os.sep.join(pathStack) + os.sep + dirList[-1] + "nn")
 continue
 pathStack.append(dirList[-1])
 dirList.pop()
 dirList.append("")
 currentDir = os.sep.join(pathStack)
 SqlPathList = self.__SQLites.getPathFromSQL(currentDir)
 SqlFileList = self.__SQLites.getFileFromSQL(currentDir)
 for filename in tmpList:
 fullname = os.sep.join([currentDir,filename])
 if os.path.isdir(fullname):
 if SqlPathList.has_key(filename) == False:
 self.__JobPathList.put(fullname)
 dirList.append(filename)
 elif os.path.islink(fullname):
 print "[WARNING]file:"," is a symbol link file!n"
 LOGGER.warning(fullname.join(["[WARNING]file: "," is a symbol link filenn"]))
 else:
 if SqlFileList.has_key(filename) == False:
 res = 1
 elif SqlFileList[filename] == getLastModifyTime(fullname):
 print "[DEBUG]file:",block=True)
 #此处代表已经完成了对目录的遍历工作，标记
 self.__DFS_FINISHED = True
 print "[INFO] Finish the dfs after",(datetime.datetime.now() - start).seconds,"sn"
 LOGGER.info("[INFO] Finish the dfs after " + (datetime.datetime.now() - start).seconds.__str__() + " snn")


 def __FileSync(self,fpath):
 try:
 self.__CilentUp.put("".join([self.__DST_DIR,fpath[self.__SRC_DIR.__len__():]]),open(fpath).read())
 print "".join([self.__DST_DIR,fpath[self.__SRC_DIR.__len__():]]) + " okedn"
 LOGGER.debug("".join([self.__DST_DIR,fpath[self.__SRC_DIR.__len__():]]) + " okednn")
 return True
 except upyun.UpYunClientException as ce:
 self.__ErrorFileList.append(fpath)
 print "".join([self.__DST_DIR,fpath[self.__SRC_DIR.__len__():]]) + " failed!n"
 print "Except an UpYunClientException ..."
 print "Error Message: " + ce.msg + "n"
 LOGGER.error("n".join(["".join([self.__DST_DIR,fpath[self.__SRC_DIR.__len__():]]) + " failed!n","Except an UpYunClientException ...","Error Message: " + ce.msg + "nn"]))
 return False
 except upyun.UpYunServiceException as se:
 self.__ErrorFileList.append(fpath)
 print "".join([self.__DST_DIR,fpath[self.__SRC_DIR.__len__():]]) + " failedn"
 print "Except an UpYunServiceException ..."
 print "HTTP Status Code: " + str(se.status)
 print "Error Message: " + se.msg + "n"
 LOGGER.error("n".join(["".join([self.__DST_DIR,fpath[self.__SRC_DIR.__len__():]]) + " failedn","Except an UpYunServiceException ...nHTTP Status Code: " + str(se.status),"Error Message: " + se.msg + "nn"]))
 if se.err:
 print se.err
 LOGGER.error(se.err + "nn")
 return False


 def __Worker(self,pid):
 try:
 waiting = 1
 while True:
 try:
 if self.__DFS_FINISHED == False:
 self.__mkdirList[pid] = self.__JobPathList.get(block=True,timeout=5)
 else:
 self.__mkdirList[pid] = self.__JobPathList.get(block=False)
 fpath = self.__mkdirList[pid]
 while True:
 flag = 0
 for i in range(self.__WORKER_LIMIT):
 if i != pid and self.__mkdirList[i] != "" and fpath.startswith(self.__mkdirList[i]):
 flag = 1
 break
 if flag == 0:
 break
 else:
 time.sleep(2)
 self.__CilentUp.mkdir("".join([self.__DST_DIR,fpath[self.__SRC_DIR.__len__():]]))
 self.__mkdirList[pid] = ""
 self.__SQLites.insertPathToSQL(fpath)
 continue
 except Queue.Empty,efr:
 pass
 except Exception,ex:
 pass
 try:
 fpath = self.__JobFileList.get(block=True,timeout=waiting)
 except Exception,e:
 if self.__DFS_FINISHED:
 return
 else:
 waiting = min(waiting * 2,30)
 continue
 waiting = max(waiting/2,1)
 if os.access(fpath[0],os.R_OK) == False:
 self.__ErrorFileList.append(fpath[0])
 print fpath[0].join(["[ERROR] "," Permission Denied!Need Read accessnn"])
 LOGGER.error(fpath[0].join(["[ERROR] "," Permission Denied!Need Read accessnn"]))
 continue
 res = self.__FileSync(fpath[0])
 #if sync success,update the datebase.
 if res == True:
 if fpath[1] == 1:
 self.__SQLites.insertFileToSQL(fpath[0])
 elif fpath[1] == 0:
 self.__SQLites.updateFileToSQL(fpath[0])
 else:
 print "==============ERROR==================="
 except Exception,e:
 print "[WARNING] a thread died.",e,"n"
 LOGGER.warning("[WARNING] a thread died." + e.__str__() + "nn")
 finally:
 self.__WORKER_NOW -= 1
 self.__mkdirList[pid]=""


 def __InitLogIn(self):
 self.__CilentUp = upyun.UpYun(self.__BUCKETNAME,self.__USERNAME,self.__PASSWORD,timeout=30,endpoint=upyun.ED_AUTO)

 def runMultiThreadSync(self):
 start = datetime.datetime.now()
 self.__WORKER_NOW = self.__WORKER_LIMIT
 self.__mkdirList = [""] * self.__WORKER_LIMIT
 self.__InitLogIn()
 thread.start_new_thread(self.__getFileList,(self.__SRC_DIR,))
 time.sleep(3)
 for i in range(self.__WORKER_LIMIT):
 thread.start_new_thread(self.__Worker,(i,))

 while self.__WORKER_NOW > 0:
 while self.__WORKER_NOW < self.__WORKER_LIMIT and (self.__JobPathList.qsize()>0 or self.__JobFileList.qsize()>0):
 thread.start_new_thread(self.__Worker,())
 self.__WORKER_NOW += 1
 self.__mkdirList.append("")
 print "[INFO] Create a new Thread! n"
 LOGGER.info("[INFO] Create a new Thread! nn")
 # time.sleep(20)
 for i in range(4):
 print self.__JobFileList.qsize(),self.__JobPathList.qsize()
 LOGGER.debug("[INFO]" + str(self.__JobFileList.qsize()) + " files are found and waiting for sync.")
 time.sleep(5)
 self.RollBack()
 print "[INFO]Finish uprsync after " + (datetime.datetime.now() - start).seconds.__str__() + " sn"
 LOGGER.info("[INFO]Finish uprsync after " + (datetime.datetime.now() - start).seconds.__str__() + " snn")

 def RollBack(self):
 for fullname in self.__ErrorFileList:
 print fullname.join(["[WARNING] "," is rolling back!"])
 LOGGER.warning(fullname.join(["[WARNING] "," is rolling back!"]))
 pathname = os.path.dirname(fullname)[self.__SRC_DIR.__len__():]
 while os.path.basename(pathname) != "":
 self.__SQLites.rollBackPathToSQL(pathname)
 pathname = os.path.dirname(pathname)

 #Daemon ------------------------------------------
 def __daemonize(self):
 try:
 pid = os.fork()
 if pid > 0:
 sys.exit(0)
 except OSError,ose:
 sys.stderr.write("[Daemon ERROR]fork #1 failed: %d (%s)n" % (ose.errno,ose.strerror))
 LOGGER.error("[Daemon ERROR]fork #1 failed: %d (%s)nn" % (ose.errno,ose.strerror))
 sys.exit(1)
 #脱离终端
 os.setsid()
 #修改当前工作目录
 os.chdir("/")
 #重设文件创建权限
 os.umask(0)
 #第二次fork，禁止进程重新打开控制终端
 try:
 pid = os.fork()
 if pid > 0:
 sys.exit(0)
 except OSError,e:
 sys.stderr.write("[Daemon ERROR]fork #2 failed: %d (%s)n" % (e.errno,e.strerror))
 LOGGER.error("[Daemon ERROR]fork #2 failed: %d (%s)nn" % (e.errno,e.strerror))
 sys.exit(1)

 sys.stdout.flush()
 sys.stderr.flush()
 so = file(self.stdout,'a+')
 se = file(self.stderr,'a+',0)
 #重定向标准输出/错误
 os.dup2(so.fileno(),sys.stdout.fileno())
 os.dup2(se.fileno(),sys.stderr.fileno())

 #注册程序退出时的函数，即删掉pid文件
 atexit.register(self.__delpid)
 pid = str(os.getpid())
 file(self.pidfile,'w+').write("%sn" % pid)

 def __delpid(self):
 os.remove(self.pidfile)

 def start(self):

 """
 Start the daemon
 """
 print "[Deamon DEBUG]start in Daemonn"
 LOGGER.debug("[Daemon DEBUG]start in Daemonnn")
 # Check for a pidfile to see if the daemon already runs
 try:
 pf = file(self.pidfile,'r')
 pid = int(pf.read().strip())
 pf.close()
 except IOError:
 pid = None

 if pid:
 message = "pidfile %s already exist. Daemon already running?nn"
 sys.stderr.write(message % self.pidfile)
 LOGGER.error("[Daemon ERROR]pidfile %s already exist. Daemon already running?nn" % self.pidfile)
 sys.exit(1)

 # Start the daemon
 self.__daemonize()
 self.__run()

 def stop(self):
 """
 Stop the daemon
 """
 # Get the pid from the pidfile
 print "[Deamon DEBUG]stop in Daemonn"
 LOGGER.debug("[Daemon DEBUG]stop in Daemonnn")
 try:
 pf = file(self.pidfile,'r')
 pid = int(pf.read().strip())
 pf.close()
 except IOError:
 pid = None

 if not pid:
 message = "pidfile %s does not exist. Daemon not running?n"
 sys.stderr.write(message % self.pidfile)
 LOGGER.error("[Daemon ERROR]pidfile %s does not exist. Daemon not running?nn" % self.pidfile)
 return # not an error in a restart
 # Try killing the daemon process
 try:
 while True:
 os.kill(pid,signal.SIGTERM)
 time.sleep(0.1)
 except OSError,err:
 err = str(err)
 if err.find("No such process") > 0:
 if os.path.exists(self.pidfile):
 os.remove(self.pidfile)
 else:
 print str(err)
 sys.exit(1)

 def restart(self):
 """
 Restart the daemon
 """
 self.stop()
 self.start()

 def __run(self):
 self.runMultiThreadSync()

#---------------------------- DB ----------------------------------------
class UpYunSqlite:
 """
 元数据的操作
 """

 def __init__(self,SRC_DIR="/home/glcsnz123",DBFILENAME="example.db"):
 self.SRC_DIR = SRC_DIR
 self.DBFILENAME = DBFILENAME
 self.__InitConnect()
 self.lockSql = thread.allocate_lock()

 def __InitDBFile(self):
 if not os.access(self.SRC_DIR,os.W_OK):
 print "[ERROR]No write access in current directory"
 LOGGER.error("[ERROR]No write access in current directory")
 sys.exit("403")
 conn = sqlite3.connect(os.sep.join([self.SRC_DIR,self.DBFILENAME]))
 cur = conn.cursor()
 cur.execute("CREATE TABLE FileModify(id INTEGER PRIMARY KEY AUTOINCREMENT,filename VARCHAR(256),
 pathname VARCHAR(256),last_modify DATE)")
 cur.execute("CREATE TABLE PathModify(id INTEGER PRIMARY KEY AUTOINCREMENT,pathname VARCHAR(256),
 fatherpath VARCHAR(256),last_modify DATE)")
 cur.close()
 conn.close()

 def __InitConnect(self):
 if os.path.isfile(os.sep.join([self.SRC_DIR,self.DBFILENAME])) == False:
 self.__InitDBFile()
 self.CONN = sqlite3.connect(os.sep.join([self.SRC_DIR,self.DBFILENAME]),check_same_thread=False)
 self.CUR = self.CONN.cursor()

 def getPathFromSQL(self,fapath):
 query = "select pathname,last_modify from PathModify where fatherpath='%s'" % (
 self.__rpQuota(fapath[self.SRC_DIR.__len__():]))
 try:
 self.lockSql.acquire()
 self.CUR.execute(query)
 res = self.CUR.fetchall()
 finally:
 self.lockSql.release()
 resObj = {}
 for i in range(res.__len__()):
 resObj[res[i][0]] = res[i][1]
 return resObj

 def getFileFromSQL(self,fapath):
 query = "select filename,last_modify from FileModify where pathname = '%s'" % (
 self.__rpQuota(fapath[self.SRC_DIR.__len__():]))
 try:
 self.lockSql.acquire()
 self.CUR.execute(query)
 res = self.CUR.fetchall()
 finally:
 self.lockSql.release()
 resObj = {}
 for i in range(res.__len__()):
 resObj[res[i][0]] = res[i][1]
 return resObj

 def updateFileToSQL(self,fpath):
 query = r"update FileModify SET last_modify = '%s' where filename = '%s' AND pathname = '%s'" % (
 getLastModifyTime(fpath),self.__rpQuota(os.path.basename(fpath)),self.__rpQuota(os.path.dirname(fpath)[self.SRC_DIR.__len__():]))
 try:
 self.lockSql.acquire()
 self.CUR.execute(query)
 self.CONN.commit()
 except sqlite3.OperationalError,soe:
 print "[Error] syntax error!nError Query: " + query,"nError Path: " + fpath + 'n'
 LOGGER.error("[Error] syntax error!nError Query: " + query + "nError Path: " + fpath + 'nn')
 finally:
 self.lockSql.release()

 def insertFileToSQL(self,fpath):
 query = r"insert into FileModify(filename,pathname,last_modify) values('%s','%s','%s')" % (
 self.__rpQuota(os.path.basename(fpath)),self.__rpQuota(os.path.dirname(fpath)[self.SRC_DIR.__len__():]),getLastModifyTime(fpath))
 try:
 self.lockSql.acquire()
 self.CUR.execute(query)
 self.CONN.commit()
 except sqlite3.OperationalError,"nError Path: " + fpath + 'n'
 LOGGER.error("[Error] syntax error!nError Query: " + query + "nError Path: " + fpath + 'nn')
 finally:
 self.lockSql.release()

 def updatePathToSQL(self,pathname):
 query = r"update PathModify SET last_modify = '%s' where pathname = '%s' and fatherpath='%s'" % (
 getLastModifyTime(pathname),self.__rpQuota(os.path.basename(pathname)),self.__rpQuota(os.path.dirname(pathname)[self.SRC_DIR.__len__():]))
 try:
 self.lockSql.acquire()
 self.CUR.execute(query)
 self.CONN.commit()
 except sqlite3.OperationalError,soe:
 print "[Error] syntax error!n Error Query: " + query,"nError Path: " + pathname + "n"
 LOGGER.error("[Error] syntax error!n Error Query: " + query + "nError Path: " + pathname + "nn")
 finally:
 self.lockSql.release()

 def rollBackPathToSQL(self,pathname):
 query = r"update PathModify SET last_modify = '%s' where pathname = '%s' and fatherpath='%s'" % (
 getLastModifyTime(""),self.__rpQuota(os.path.dirname(pathname)))

 try:
 self.lockSql.acquire()
 self.CUR.execute(query)
 self.CONN.commit()
 except sqlite3.OperationalError,"nError Path: " + pathname + "n"
 LOGGER.error("[Error] syntax error!n Error Query: " + query + "nError Path: " + pathname + "nn")
 finally:
 self.lockSql.release()

 def insertPathToSQL(self,pathname):
 query = r"insert into PathModify(pathname,fatherpath,'%s')" % (
 self.__rpQuota(os.path.basename(pathname)),self.__rpQuota(os.path.dirname(pathname)[self.SRC_DIR.__len__():]),getLastModifyTime(pathname))
 try:
 self.lockSql.acquire()
 self.CUR.execute(query)
 self.CONN.commit()
 except sqlite3.OperationalError,"nError Path: " + pathname + "n"
 LOGGER.error("[Error] syntax error!n Error Query: " + query + "nError Path: " + pathname + "nn")
 finally:
 self.lockSql.release()

 def __rpQuota(self,st):
 return st.replace("'",r"//")


if __name__ == "__main__":
 InitLogger()
 ups = UpYunUprSync()
 ups.setThreadNumLimit(20)
 ups.runMultiThreadSync()


###############################
# 问题主要出在了数据库的询问上，所以必须减少数据库的访问
# getFileList函数主要的花费是在mkdir和数据库操作上。，数据库操作占了50%的花费
# mkdir大概花了25%的时间代价
#

ReadMe.txt
基本函数接口
初始化日志:
    InitLogger()
    默认日志等级为INFO
    设置日志等级
    SetLoggerLevel(log_level)
    参数log_level 为日志的等级
    可选日志等级有（不区分大小写）：
        "DEBUG"
        "INFO"
        "WARNING"
        "ERROR"
        "OFF"
    其中OFF表示关闭日志功能，另外，如果未初始化日志，日志功能默认是关闭的。
    日志的存放地址默认为/tmp/UpYunSync.log。同时，也可通过以下方法来设定日志文件地址:
        UpYunrSync.LOGFILE = LOG_FILE
    其中参数LOG_FILE 为日志文件的地址


初始化UpYunrSync
    import UpYunrSync
    ups = UpYunrSync.UpYunUprSync(BUCKETNAME,USERNAME,PASSWORD,SRC_DIR,DST_DIR,DBFILENAME)
    其中参数 bucket 为空间名称，username 和 password 分别为授权操作员帐号和密码，SRC_DIR和DST_DIR分别为需要同步的本地目录和服务器目录，必选。
    参数DBFILENAME为存储本地文件元数据的sqlite文件，默认值为.UpYunSqlite.db
设置线程开启个数
    ups.setThreadNumLimit(Thread_Num)
    参数Thread_Num为上传文件的线程个数，线程个数并不是越多越好，应当根据所要上传的目录中文件个数以及大小来确定。
同步目录
    终端直接同步文件形式
        ups.runMultiThreadSync()
        执行文件同步的操作
    后台守护进程同步文件形式
        ups.start()
        ups.stop()
        ups.restart()
        三个方法分别是启动进程、停止进程和重启进程。
    后台进程模式下，分别设置程序标准输出、错误输出和PID文件位置的方法如下：
        ups.stdout = Stdout_File
        ups.stderr = Stderr_File
        ups.pidfile = Pid_File
        其中，参数Stdout_File 和 Stderr_File 分别是标准输出和错误输出的文件地址，默认值为/dev/null。Pid_File为进程的PID文件位置，默认值为/tmp/uprsync.pid

（编辑：李大同）

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