Another big round of refactoring and cleaning...

roles/sys-cln-bkps-service/files/sys-cln-backups.py

@@ -0,0 +1,153 @@
+import psutil
+import shutil
+import os
+import argparse
+import subprocess
+import time
+
+# Validating arguments
+parser = argparse.ArgumentParser()
+parser.add_argument('--maximum-backup-size-percent', type=int, dest='maximum_backup_size_percent',required=True, choices=range(0,100), help="The directory from which the data should be encrypted.")
+parser.add_argument('--backups-folder-path',type=str,dest='backups_folder_path',required=True, help="The folder in which the backups are stored")
+args = parser.parse_args()
+
+def print_used_disc_space(backups_folder_path):
+    print("%d %% of disk %s are used" % (psutil.disk_usage(backups_folder_path).percent,backups_folder_path))  
+
+def is_directory_used_by_another_process(directory_path):
+    command= "lsof " + directory_path
+    process = subprocess.Popen([command], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+    output, error = process.communicate()
+    # @See https://stackoverflow.com/questions/29841984/non-zero-exit-code-for-lsof
+    if process.wait() > bool(0):
+        return False
+    return True
+
+def isSmallerThenMaximumBackupSize(maximum_backup_size_percent,backups_folder_path):
+    current_disc_usage_percent=psutil.disk_usage(backups_folder_path).percent
+    return current_disc_usage_percent > maximum_backup_size_percent
+
+def isDirectoryDeletable(version, versions, version_path):
+    print("Checking directory %s ..." % (version_path))
+    if version == versions[-1]:
+        print("Directory %s contains the last version of the backup. Skipped." % (version_path))
+        return False
+    
+    if is_directory_used_by_another_process(version_path):
+        print("Directory %s is used by another process. Skipped." % (version_path))
+        return False
+    
+    print(f"Directory {version_path} can be deleted.")
+    return True
+    
+def deleteVersion(version_path, backups_folder_path):
+    print("Deleting %s to free space." % (version_path))
+    current_disc_usage_percent=psutil.disk_usage(backups_folder_path).percent
+    shutil.rmtree(version_path)
+    new_disc_usage_percent=psutil.disk_usage(backups_folder_path).percent
+    difference_percent=current_disc_usage_percent-new_disc_usage_percent
+    print("{:6.2f} %% of drive freed".format(difference_percent))
+
+def count_total_application_directories(backups_folder_path):
+    total_app_directories = 0
+    for host_backup_directory_name in os.listdir(backups_folder_path):
+        host_backup_directory_path = os.path.join(backups_folder_path, host_backup_directory_name)
+        total_app_directories += sum(os.path.isdir(os.path.join(host_backup_directory_path, d)) for d in os.listdir(host_backup_directory_path))
+    return total_app_directories
+
+def count_total_version_folders(backups_folder_path):
+    total_version_folders = 0
+    for host_backup_directory_name in os.listdir(backups_folder_path):
+        host_backup_directory_path = os.path.join(backups_folder_path, host_backup_directory_name)
+        for application_directory in os.listdir(host_backup_directory_path):
+            versions_directory = os.path.join(host_backup_directory_path, application_directory)
+            total_version_folders += sum(os.path.isdir(os.path.join(versions_directory, d)) for d in os.listdir(versions_directory))
+    return total_version_folders
+
+def average_version_directories_per_application(backups_folder_path):
+    total_app_directories = count_total_application_directories(backups_folder_path)
+    total_version_folders = count_total_version_folders(backups_folder_path)
+    
+    if total_app_directories == 0:
+        return 0
+
+    average = total_version_folders / total_app_directories
+    return int(average)
+
+def getAmountOfIteration(versions,average_version_directories_per_application):
+    version_amount=len(versions)
+    amount_of_iterations=(len(versions) +1) - average_version_directories_per_application
+    print(f"Number of existing versions: {version_amount}")
+    print(f"Number of average version directories per application: {average_version_directories_per_application}")
+    print(f"Amount of iterations: {amount_of_iterations}")
+    return amount_of_iterations
+
+def deleteIteration(backups_folder_path,average_version_directories_per_application):
+    for host_backup_directory_name in os.listdir(backups_folder_path):
+        print(f"Iterating over host: {host_backup_directory_name}")
+        host_backup_directory_path = os.path.join(backups_folder_path, host_backup_directory_name)
+        for application_directory in os.listdir(host_backup_directory_path):
+            print(f"Iterating over backup application: {application_directory}")
+            # The directory which contains all backup versions of the application
+            versions_directory = os.path.join(host_backup_directory_path, application_directory) + "/"
+                        
+            versions = os.listdir(versions_directory)
+            versions.sort(reverse=False)
+            version_iteration=0 
+            while version_iteration < getAmountOfIteration(versions,average_version_directories_per_application):
+                print_used_disc_space(backups_folder_path)
+                version = versions[version_iteration]
+                version_path=os.path.join(versions_directory, version)
+                if isDirectoryDeletable(version, versions, version_path):
+                    deleteVersion(version_path, backups_folder_path)
+                version_iteration += 1 
+                     
+def check_time_left(start_time, time_limit):
+    """
+    Checks if there is time left within the given time limit.
+    Prints the start time, the current time, and the remaining time.
+
+    :param start_time: The start time of the process.
+    :param time_limit: The total time limit for the process.
+    :return: True if there is time left, False otherwise.
+    """
+    current_time = time.time()
+    elapsed_time = current_time - start_time
+    remaining_time = time_limit - elapsed_time
+
+    # Convert times to readable format
+    start_time_str      =   time.strftime("%H:%M:%S", time.localtime(start_time))
+    current_time_str    =   time.strftime("%H:%M:%S", time.localtime(current_time))
+    remaining_time_str  =   time.strftime("%H:%M:%S", time.gmtime(remaining_time))
+    is_time_left        =   remaining_time > 0
+
+    print(f"Start time: {start_time_str}")
+    print(f"Current time: {current_time_str}")
+    if is_time_left:
+        print(f"Remaining time: {remaining_time_str}")
+
+    return remaining_time > 0
+
+class TimeLimitExceededException(Exception):
+    """Exception raised when the time limit for the process is exceeded."""
+    def __init__(self, message="Time limit exceeded, terminating the process."):
+        self.message = message
+        super().__init__(self.message)
+
+backups_folder_path=args.backups_folder_path
+maximum_backup_size_percent=args.maximum_backup_size_percent
+start_time = time.time()
+time_limit = 3600
+itteration_counter = 1
+while isSmallerThenMaximumBackupSize(maximum_backup_size_percent, backups_folder_path):
+    print(f"Delete Iteration: {itteration_counter}")
+    if not check_time_left(start_time, time_limit):
+        raise TimeLimitExceededException()
+    
+    average_version_directories = average_version_directories_per_application(backups_folder_path)
+    print(f"Average version directories per application directory: {average_version_directories}")
+    deleteIteration(backups_folder_path, average_version_directories)    
+    itteration_counter += 1
+
+print_used_disc_space(backups_folder_path)            
+print("Cleaning up finished.")