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

import os
import sys
import logging
from threading import Thread
import Queue


logging.basicConfig(format='%(asctime)s %(message)s', level=logging.INFO)

class Worker(Thread):
    def __init__(self, do_work, task_queue, workid):
        Thread.__init__(self)
        self.do_work = do_work
        self.task_queue = task_queue
        self.workid = workid

    def run(self):
        while True:
            try:
                task = self.task_queue.get()
                if task is None:
                    break
                self.do_work(task, self.workid)
            except Exception as e:
                logging.warning('Failed to execute task: %s' % e)
            finally:
                self.task_queue.task_done()

class ThreadPool(object):
    def __init__(self, do_work, nworker=20):
        self.do_work = do_work
        self.nworker = nworker
        self.workid = 0
        self.task_queue = Queue.Queue()

    def start(self):
        for i in xrange(self.nworker):
            self.workid = i
            Worker(self.do_work, self.task_queue, self.workid).start()

    def put_task(self, task):
        self.task_queue.put(task)

    def join(self):
        self.task_queue.join()
        # notify all thread to stop
        for i in xrange(self.nworker):
            self.task_queue.put(None)

class Task(object):
    def __init__(self, repo_id, repo_version, obj_id):
        self.repo_id = repo_id
        self.repo_version = repo_version
        self.obj_id = obj_id

class ObjMigrateWorker(Thread):
    def __init__(self, top_path, stype, dst_pool):
        Thread.__init__(self)
        self.top_path = top_path
        self.stype = stype
        self.dst_pool = dst_pool
        self.thread_pool = ThreadPool(self.do_work)

    def run(self):
        logging.info('Start to migrate [%s] object' % self.stype)
        self.thread_pool.start()
        self.migrate()
        self.thread_pool.join()
        logging.info('Complete migrate [%s] object' % self.stype)

    def do_work(self, task, workid):
        print "workerID:",workid,"--task is:",os.path.join(self.stype,task.repo_id,task.obj_id)

    def migrate(self):
        #put work to queue
        top_path = self.top_path
        for repo_id in os.listdir(top_path):
            repo_path = os.path.join(top_path, repo_id)
            for spath in os.listdir(repo_path):
                obj_path = os.path.join(repo_path, spath)
                for lpath in os.listdir(obj_path):
                    obj_id = spath + lpath
                    task = Task(repo_id, 1, obj_id)
                    self.thread_pool.put_task(task)

def main():
    top_path = sys.argv[1]
    dtypes = {'commits':'commits', 'fs':'fs', 'blocks':'blocks'}
    for stype in dtypes:
        ObjMigrateWorker(os.path.join(top_path,stype), stype, dtypes[stype]).start()

if __name__ == '__main__':
    if sys.argv[0] < 1:
        print "Top storage absolute path is needed."
    main()