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| """ |
| Kerberos Environment Locker class |
| """ |
|
|
| from threading import Lock |
| from os import environ |
| from flask import session, current_app |
|
|
| import config |
| from pgadmin.utils.constants import KERBEROS |
|
|
|
|
| class ConnectionLocker: |
| """Implementing lock while setting/unsetting |
| the Kerberos environ variables.""" |
| lock = Lock() |
|
|
| def __init__(self, _is_kerberos_conn=False): |
| self.is_kerberos_conn = _is_kerberos_conn |
|
|
| def __enter__(self): |
| if config.SERVER_MODE: |
| current_app.logger.info("Waiting for a lock.") |
| self.lock.acquire() |
| current_app.logger.info("Acquired a lock.") |
|
|
| if 'auth_source_manager' in session and \ |
| session['auth_source_manager']['current_source'] == \ |
| KERBEROS and 'KRB5CCNAME' in session \ |
| and self.is_kerberos_conn: |
| environ['KRB5CCNAME'] = session['KRB5CCNAME'] |
| else: |
| environ.pop('KRB5CCNAME', None) |
|
|
| return self |
|
|
| def __exit__(self, type, value, traceback): |
| if config.SERVER_MODE: |
| environ.pop('KRB5CCNAME', None) |
| if self.lock.locked(): |
| current_app.logger.info("Released a lock.") |
| self.lock.release() |
|
|
