Download data from ftp server with Python

#ftp #python #download #automation

Recently, I needed to download the latest version of software from a ftp server then install it into tested machine.

I think there might be someone would need to know this so today I'm gonna share with you how to download data from ftp server with Python.

The following post might be how to install the app automatically.

I.What is ftp server:

You might want to readthis but basically ftp server is where you store the files

II.FTPlib in Python:

You might want to go to official doc for ftplib inhere

We're gonna use ftplib to interact with ftp server

III.Real world example:
Below is a sample working ftp server

The scenario is this, we need to go to that server, find the latest version of file, and download it.

If the latest version of file is already downloaded, no need to download it again.

1.Store the downloaded version name into yaml file:

Sample configuration file where we have coccoc_dev_version

#configurations.yaml--------coccoc_dev_version:79.0.3945.98jenkins:admin_password:'123456'admin_username:admindomain:http://10.0.12.96:8080

Self-made utils for working with yaml files

classYamlUtils:def__new__(cls):ifnothasattr(cls,'instance'):cls.instance=super(YamlUtils,cls).__new__(cls)returncls.instancedefread_data_from_file(self,file):withopen(file)asstream:try:returnyaml.safe_load(stream)exceptyaml.YAMLErrorasexc:print(exc)defwrite_data_to_file(self,loaded,file):withopen(file,'wb')asstream:try:returnyaml.safe_dump(loaded,stream,default_flow_style=False,explicit_start=True,allow_unicode=True,encoding='utf-8')exceptyaml.YAMLErrorasexc:print(exc)

Override latest version of file to yaml:

yaml_made_utils=YamlUtils()configuration_info=Noneconfiguration_path='/resources/configurations.yaml'defget_configurations_info():ifconfiguration_infoisNone:returnyaml_made_utils.read_data_from_file(os.getcwd()+configuration_path)else:returnconfiguration_infoclassCocCocConfigs:COCCOC_DEV_VERSION=get_configurations_info()['coccoc_dev_version']@staticmethoddefupdate_coccoc_dev_version(coccoc_version):data=get_configurations_info()data['coccoc_dev_version']=coccoc_versionreturnyaml_made_utils.write_data_to_file(data,os.getcwd()+configuration_path)

2.Download the latest version of file if it's not downloaded yet

defdownload_latest_coccoc_dev_installer():coccoc_installer_name="standalone_coccoc_en.exe"fromftplibimportFTPwithFTP('browser3v.dev.itim.vn')asftp:ftp.login('anonymous','')ftp.cwd('corom')folders_list=ftp.nlst()coccoc_download_folder_list=get_list_coccoc_installer_dirs(folders_list)latest_coccoc_download_dir=coccoc_download_folder_list[-1]fromconfigs.yaml_configsimportCocCocConfigsifCocCocConfigs.COCCOC_DEV_VERSIONnotinlatest_coccoc_download_dir:ftp.cwd(f"{latest_coccoc_download_dir}/installers")try:ftp.retrbinary("RETR"+coccoc_installer_name,open(f"C:\\coccoc-dev\\{coccoc_installer_name}",'wb').write)except:print(f"Error download coccoc binary for {coccoc_installer_name}")returnlatest_coccoc_download_direlse:return"Already latest"

Notice we need to provide username and password along with the ftp host name like:

withFTP('browser3v.dev.itim.vn')asftp:ftp.login('anonymous','')

3.Main function to download file, and updated version name into the configurations file:

defmain():coccoc_version=download_latest_coccoc_dev_installer()ifcoccoc_versionnotin"Already latest":CocCocConfigs.update_coccoc_dev_version(coccoc_version)else:passif__name__=="__main__":main()