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import unittest
import json
import sys
from pyhdfs import HdfsClient
sys.path.append("..")
from trial.hdfsClientUtility import copyFileToHdfs, copyDirectoryToHdfs
import os
import shutil
import random
import string

class HDFSClientUtilityTest(unittest.TestCase):
    '''Unit test for hdfsClientUtility.py'''
    def setUp(self):
        self.hdfs_file_path = '../../.vscode/hdfsInfo.json'
        self.hdfs_config = None
        try:
            with open(self.hdfs_file_path, 'r') as file:
                self.hdfs_config = json.load(file)
        except Exception as exception:
            print(exception)
        
        self.hdfs_client = HdfsClient(hosts='{0}:{1}'.format(self.hdfs_config['host'], '50070'), user_name=self.hdfs_config['userName'])
    
    def get_random_name(self, length):
        return ''.join(random.sample(string.ascii_letters + string.digits, length))

    def test_copy_file_run(self):
        '''test copyFileToHdfs'''
        file_name = self.get_random_name(8)
        file_content = 'hello world!'
        
        with open('./{}'.format(file_name), 'w') as file:
            file.write(file_content)        
        
        result = copyFileToHdfs('./{}'.format(file_name), '/{0}/{1}'.format(self.hdfs_config['userName'], file_name), self.hdfs_client)
        self.assertTrue(result)

        file_list = self.hdfs_client.listdir('/{0}'.format(self.hdfs_config['userName']))
        self.assertIn(file_name, file_list)
        
        hdfs_file_name = self.get_random_name(8)
        self.hdfs_client.copy_to_local('/{0}/{1}'.format(self.hdfs_config['userName'], file_name), './{}'.format(hdfs_file_name))
        self.assertTrue(os.path.exists('./{}'.format(hdfs_file_name)))
        
        with open('./{}'.format(hdfs_file_name), 'r') as file:
            content = file.readline()
            self.assertEqual(file_content, content)
        #clean up
        os.remove('./{}'.format(file_name))
        os.remove('./{}'.format(hdfs_file_name))
        self.hdfs_client.delete('/{0}/{1}'.format(self.hdfs_config['userName'], file_name))
    
    def test_copy_directory_run(self):
        '''test copyDirectoryToHdfs'''
        directory_name = self.get_random_name(8)
        file_name_list = [self.get_random_name(8), self.get_random_name(8)]
        file_content = 'hello world!'
        
        os.makedirs('./{}'.format(directory_name))
        for file_name in file_name_list:
            with open('./{0}/{1}'.format(directory_name, file_name), 'w') as file:
                file.write(file_content)
        
        result = copyDirectoryToHdfs('./{}'.format(directory_name), '/{0}/{1}'.format(self.hdfs_config['userName'], directory_name), self.hdfs_client)
        self.assertTrue(result)
        
        directory_list = self.hdfs_client.listdir('/{0}'.format(self.hdfs_config['userName']))
        self.assertIn(directory_name, directory_list)

        sub_file_list = self.hdfs_client.listdir('/{0}/{1}'.format(self.hdfs_config['userName'], directory_name))
        for file_name in file_name_list:
            self.assertIn(file_name, sub_file_list)
            #clean up
            self.hdfs_client.delete('/{0}/{1}/{2}'.format(self.hdfs_config['userName'], directory_name, file_name))
        self.hdfs_client.delete('/{0}/{1}'.format(self.hdfs_config['userName'], directory_name))
        
        shutil.rmtree('./{}'.format(directory_name))

if __name__ == '__main__':
    unittest.main()