This post offers an introduction to the FTP/FTPS functionality.
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Zato has had support for FTP/FTPS since its inception. In Zato 3.1+, SFTP is also an option to consider for file transfer, and this post offers an introduction to the functionality.
For build and deployment automation, zato enmasse is the command line tool most convenient to use, but during initial development, SFTP connections can be constructed in web-admin.
The form lets you provide all the default options that apply to each SFTP connection — remote host, what protocol to use, whether file metadata should be preserved during transfer, logging level, bandwidth limit for each connection, SSH identity and config files, as well as additional SSH options — the last one means that any SSH option that man sftp lists can also be used in Zato connections.
The first thing that you can do right after the creation of a new connection is to ping it to check if the server is responding.
Pinging opens a new SFTP connection and runs the ping command — in the screenshot above, it was ls . — a practically no-op command whose sole purpose is to let the connection confirm that commands in fact can be executed, which proves the correctness of the configuration.
This will either return details of why a connection could not be established or the response time if it was successful.
Having validated the configuration by pinging it, we can now execute SFTP commands straight in web-admin from a command shell:
Any SFTP command or even a series of commands can be sent and responses retrieved immediately. It is also possible to increase the logging level for additional SFTP protocol-level details.
This makes it possible to rapidly prototype file transfer functionality as a series of scripts that can be next moved as they are to Python-based services.
For Python services, an extensive API is available. The API can execute transfer commands individually or in batches, but alternatively, it may make use of SFTP scripts previously created in web-admin. Here is how it can be used in practice:
# -*- coding: utf-8 -*- from __future__ import absolute_import, division, print_function, unicode_literals # Zato from zato.server.service import Service class MySFTPService(Service): def handle(self): # Connection to use conn_name = 'My SFTP Connection' # Get a handle to the connection object conn = self.out.sftp[conn_name].conn # Execute an arbitrary script with one or more SFTP commands, like in web-admin my_script = 'ls -la /remote/path' conn.execute(my_script) # Ping a remote server to check if it responds conn.ping() # Download an entry, possibly recursively conn.download('/remote/path', '/local/path') # Like .download but remote path must point to a file (exception otherwise) conn.download_file('/remote/path', '/local/path') # Makes the contents of a remote file available on output out = conn.read('/remote/path') # Uploads a local file or directory to remote path conn.upload('/local/path', '/remote/path') # Writes input data out to a remote file data = 'My data' conn.write(data, '/remote/path') # Create a new directory conn.create_directory('/path/to/new/directory') # Create a new symlink conn.create_symlink('/path/to/new/symlink') # Create a new hard-link conn.create_hardlink('/path/to/new/hardlink') # Delete an entry, possibly recursively, no matter what kind it is conn.delete('/path/to/delete') # Like .delete but path must be a directory conn.delete_directory('/path/to/delete') # Like .delete but path must be a file conn.delete_file('/path/to/delete') # Like .delete but path must be a symlink conn.delete_symlink('/path/to/delete') # Get information about an entry, e.g. modification time, owner, size and more info = conn.get_info('/remote/path') self.logger.info(info.last_modified) self.logger.info(info.owner) self.logger.info(info.size) self.logger.info(info.size_human) self.logger.info(info.permissions_oct) # A boolean flag indicating if path is a directory result = conn.is_directory('/remote/path') # A boolean flag indicating if path is a file result = conn.is_file('/remote/path') # A boolean flag indicating if path is a symlink result = conn.is_symlink('/remote/path') # List contents of a directory - items are in the same format that .get_info uses items = conn.list('/remote/path') # Move (rename) remote files or directories conn.move('/from/path', '/to/path') # An alias to .move conn.rename('/from/path', '/to/path') # Change mode of entry at path conn.chmod('600', '/path/to/entry') # Change owner of entry at path conn.chown('myuser', '/path/to/entry') # Change group of entry at path conn.chgrp('mygroup', '/path/to/entry')
SFTP is a new file transfer option added in Zato 3.1. Users may quickly prototype SFTP scripts in web-admin and employ them in Zato services. Alternatively, a full Python API is available for programmatic access to remote file servers. Combined, the features make it possible to create scalable and reusable file transfer services in a quick and efficient manner.
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