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import os
import subprocess
class BaseDatabaseClient:
"""Encapsulate backend-specific methods for opening a client shell."""
# This should be a string representing the name of the executable
# (e.g., "psql"). Subclasses must override this.
executable_name = None
def __init__(self, connection):
# connection is an instance of BaseDatabaseWrapper.
self.connection = connection
@classmethod
def settings_to_cmd_args_env(cls, settings_dict, parameters):
raise NotImplementedError(
"subclasses of BaseDatabaseClient must provide a "
"settings_to_cmd_args_env() method or override a runshell()."
)
def runshell(self, parameters):
args, env = self.settings_to_cmd_args_env(
self.connection.settings_dict, parameters
)
env = {**os.environ, **env} if env else None
subprocess.run(args, env=env, check=True)
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