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core.py
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core.py
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from logging import *
from mysql import MySQL
from time import strftime
import os
import shutil
import re
class SimpleDBMigrate(object):
__migration_files_extension = ".migration"
def __init__(self, migrations_dir):
self.__migrations_dir = migrations_dir
def get_all_migration_files(self):
dir_list = os.listdir(self.__migrations_dir)
files = []
for dir_file in dir_list:
if self.is_file_name_valid(dir_file):
files.append(dir_file)
if len(files) == 0:
Log().error_and_exit("no migration files found")
files.sort()
return files
def get_sql_command(self, sql_file, migration_up=True):
f = open(self.__migrations_dir + "/" + sql_file, "r")
exec(f.read())
f.close()
if migration_up:
return SQL_UP
else:
return SQL_DOWN
def get_all_migration_versions(self):
versions = []
migration_files = self.get_all_migration_files()
for each_file in migration_files:
versions.append(self.get_migration_version(each_file))
return versions
def get_all_migration_versions_up_to(self, limit_version):
all_versions = self.get_all_migration_versions()
return [version for version in all_versions if version < limit_version]
def get_migration_version(self, sql_file):
return sql_file[0:sql_file.find("_")]
def check_if_version_exists(self, version):
files = self.get_all_migration_files()
for f in files:
if f.startswith(version):
return True
return False
def get_migration_files_between_versions(self, current_version, destination_version):
#TODO: make it less idiot :)
migration_up = True
if int(current_version) > int(destination_version):
migration_up = False
all_files = self.get_all_migration_files()
if not migration_up:
all_files.reverse()
migration_files = []
for f in all_files:
f_version = self.get_migration_version(f)
if migration_up:
if int(f_version) > int(current_version) and int(f_version) <= int(destination_version):
migration_files.append(f)
else:
if int(f_version) > int(destination_version) and int(f_version) <= int(current_version):
migration_files.append(f)
return migration_files
def latest_schema_version_available(self):
all_files = self.get_all_migration_files()
all_files.sort()
all_files.reverse()
return self.get_migration_version(all_files[0])
def is_file_name_valid(self, file_name):
mask = r"[0-9]{14}\w+%s" % self.__migration_files_extension
match = re.match(mask, file_name, re.IGNORECASE)
return match != None
def create_migration(self, migration_name):
timestamp = strftime("%Y%m%d%H%M%S")
file_name = "%s_%s%s" % (timestamp, migration_name, self.__migration_files_extension)
if not self.is_file_name_valid(file_name):
Log().error_and_exit("invalid migration name; it should contain only letters, numbers and/or underscores ('%s')" % migration_name)
new_file = "%s/%s" % (self.__migrations_dir, file_name)
try:
f = open(new_file, "w")
f.write(MigrationFile.template)
f.close()
except IOError:
Log().error_and_exit("could not create file ('%s')" % new_file)
return file_name
class MigrationFile(object):
template = '''SQL_UP = """
"""
SQL_DOWN = """
"""'''