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([84.245.121.10]) by smtp.gmail.com with ESMTPSA id q4-20020adfea04000000b003296b488961sm1870143wrm.31.2023.11.23.07.13.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Nov 2023 07:14:00 -0800 (PST) From: =?UTF-8?q?Juraj=20Linke=C5=A1?= To: thomas@monjalon.net, Honnappa.Nagarahalli@arm.com, jspewock@iol.unh.edu, probb@iol.unh.edu, paul.szczepanek@arm.com, yoan.picchi@foss.arm.com, Luca.Vizzarro@arm.com Cc: dev@dpdk.org, =?UTF-8?q?Juraj=20Linke=C5=A1?= Subject: [PATCH v8 11/21] dts: remote session docstring update Date: Thu, 23 Nov 2023 16:13:34 +0100 Message-Id: <20231123151344.162812-12-juraj.linkes@pantheon.tech> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231123151344.162812-1-juraj.linkes@pantheon.tech> References: <20231115130959.39420-1-juraj.linkes@pantheon.tech> <20231123151344.162812-1-juraj.linkes@pantheon.tech> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Format according to the Google format and PEP257, with slight deviations. Signed-off-by: Juraj Linkeš --- dts/framework/remote_session/__init__.py | 39 +++++- .../remote_session/remote_session.py | 130 +++++++++++++----- dts/framework/remote_session/ssh_session.py | 16 +-- 3 files changed, 137 insertions(+), 48 deletions(-) diff --git a/dts/framework/remote_session/__init__.py b/dts/framework/remote_session/__init__.py index 5e7ddb2b05..51a01d6b5e 100644 --- a/dts/framework/remote_session/__init__.py +++ b/dts/framework/remote_session/__init__.py @@ -2,12 +2,14 @@ # Copyright(c) 2023 PANTHEON.tech s.r.o. # Copyright(c) 2023 University of New Hampshire -""" -The package provides modules for managing remote connections to a remote host (node), -differentiated by OS. -The package provides a factory function, create_session, that returns the appropriate -remote connection based on the passed configuration. The differences are in the -underlying transport protocol (e.g. SSH) and remote OS (e.g. Linux). +"""Remote interactive and non-interactive sessions. + +This package provides modules for managing remote connections to a remote host (node). + +The non-interactive sessions send commands and return their output and exit code. + +The interactive sessions open an interactive shell which is continuously open, +allowing it to send and receive data within that particular shell. """ # pylama:ignore=W0611 @@ -26,10 +28,35 @@ def create_remote_session( node_config: NodeConfiguration, name: str, logger: DTSLOG ) -> RemoteSession: + """Factory for non-interactive remote sessions. + + The function returns an SSH session, but will be extended if support + for other protocols is added. + + Args: + node_config: The test run configuration of the node to connect to. + name: The name of the session. + logger: The logger instance this session will use. + + Returns: + The SSH remote session. + """ return SSHSession(node_config, name, logger) def create_interactive_session( node_config: NodeConfiguration, logger: DTSLOG ) -> InteractiveRemoteSession: + """Factory for interactive remote sessions. + + The function returns an interactive SSH session, but will be extended if support + for other protocols is added. + + Args: + node_config: The test run configuration of the node to connect to. + logger: The logger instance this session will use. + + Returns: + The interactive SSH remote session. + """ return InteractiveRemoteSession(node_config, logger) diff --git a/dts/framework/remote_session/remote_session.py b/dts/framework/remote_session/remote_session.py index 719f7d1ef7..2059f9a981 100644 --- a/dts/framework/remote_session/remote_session.py +++ b/dts/framework/remote_session/remote_session.py @@ -3,6 +3,13 @@ # Copyright(c) 2022-2023 PANTHEON.tech s.r.o. # Copyright(c) 2022-2023 University of New Hampshire +"""Base remote session. + +This module contains the abstract base class for remote sessions and defines +the structure of the result of a command execution. +""" + + import dataclasses from abc import ABC, abstractmethod from pathlib import PurePath @@ -15,8 +22,14 @@ @dataclasses.dataclass(slots=True, frozen=True) class CommandResult: - """ - The result of remote execution of a command. + """The result of remote execution of a command. + + Attributes: + name: The name of the session that executed the command. + command: The executed command. + stdout: The standard output the command produced. + stderr: The standard error output the command produced. + return_code: The return code the command exited with. """ name: str @@ -26,6 +39,7 @@ class CommandResult: return_code: int def __str__(self) -> str: + """Format the command outputs.""" return ( f"stdout: '{self.stdout}'\n" f"stderr: '{self.stderr}'\n" @@ -34,13 +48,24 @@ def __str__(self) -> str: class RemoteSession(ABC): - """ - The base class for defining which methods must be implemented in order to connect - to a remote host (node) and maintain a remote session. The derived classes are - supposed to implement/use some underlying transport protocol (e.g. SSH) to - implement the methods. On top of that, it provides some basic services common to - all derived classes, such as keeping history and logging what's being executed - on the remote node. + """Non-interactive remote session. + + The abstract methods must be implemented in order to connect to a remote host (node) + and maintain a remote session. + The subclasses must use (or implement) some underlying transport protocol (e.g. SSH) + to implement the methods. On top of that, it provides some basic services common to all + subclasses, such as keeping history and logging what's being executed on the remote node. + + Attributes: + name: The name of the session. + hostname: The node's hostname. Could be an IP (possibly with port, separated by a colon) + or a domain name. + ip: The IP address of the node or a domain name, whichever was used in `hostname`. + port: The port of the node, if given in `hostname`. + username: The username used in the connection. + password: The password used in the connection. Most frequently empty, + as the use of passwords is discouraged. + history: The executed commands during this session. """ name: str @@ -59,6 +84,16 @@ def __init__( session_name: str, logger: DTSLOG, ): + """Connect to the node during initialization. + + Args: + node_config: The test run configuration of the node to connect to. + session_name: The name of the session. + logger: The logger instance this session will use. + + Raises: + SSHConnectionError: If the connection to the node was not successful. + """ self._node_config = node_config self.name = session_name @@ -79,8 +114,13 @@ def __init__( @abstractmethod def _connect(self) -> None: - """ - Create connection to assigned node. + """Create a connection to the node. + + The implementation must assign the established session to self.session. + + The implementation must except all exceptions and convert them to an SSHConnectionError. + + The implementation may optionally implement retry attempts. """ def send_command( @@ -90,11 +130,24 @@ def send_command( verify: bool = False, env: dict | None = None, ) -> CommandResult: - """ - Send a command to the connected node using optional env vars - and return CommandResult. - If verify is True, check the return code of the executed command - and raise a RemoteCommandExecutionError if the command failed. + """Send `command` to the connected node. + + The :option:`--timeout` command line argument and the :envvar:`DTS_TIMEOUT` + environment variable configure the timeout of command execution. + + Args: + command: The command to execute. + timeout: Wait at most this long in seconds for `command` execution to complete. + verify: If :data:`True`, will check the exit code of `command`. + env: A dictionary with environment variables to be used with `command` execution. + + Raises: + SSHSessionDeadError: If the session isn't alive when sending `command`. + SSHTimeoutError: If `command` execution timed out. + RemoteCommandExecutionError: If verify is :data:`True` and `command` execution failed. + + Returns: + The output of the command along with the return code. """ self._logger.info(f"Sending: '{command}'" + (f" with env vars: '{env}'" if env else "")) result = self._send_command(command, timeout, env) @@ -111,29 +164,38 @@ def send_command( @abstractmethod def _send_command(self, command: str, timeout: float, env: dict | None) -> CommandResult: - """ - Use the underlying protocol to execute the command using optional env vars - and return CommandResult. + """Send a command to the connected node. + + The implementation must execute the command remotely with `env` environment variables + and return the result. + + The implementation must except all exceptions and raise: + + * SSHSessionDeadError if the session is not alive, + * SSHTimeoutError if the command execution times out. """ def close(self, force: bool = False) -> None: - """ - Close the remote session and free all used resources. + """Close the remote session and free all used resources. + + Args: + force: Force the closure of the connection. This may not clean up all resources. """ self._logger.logger_exit() self._close(force) @abstractmethod def _close(self, force: bool = False) -> None: - """ - Execute protocol specific steps needed to close the session properly. + """Protocol specific steps needed to close the session properly. + + Args: + force: Force the closure of the connection. This may not clean up all resources. + This doesn't have to be implemented in the overloaded method. """ @abstractmethod def is_alive(self) -> bool: - """ - Check whether the remote session is still responding. - """ + """Check whether the remote session is still responding.""" @abstractmethod def copy_from( @@ -143,12 +205,12 @@ def copy_from( ) -> None: """Copy a file from the remote Node to the local filesystem. - Copy source_file from the remote Node associated with this remote - session to destination_file on the local filesystem. + Copy `source_file` from the remote Node associated with this remote session + to `destination_file` on the local filesystem. Args: - source_file: the file on the remote Node. - destination_file: a file or directory path on the local filesystem. + source_file: The file on the remote Node. + destination_file: A file or directory path on the local filesystem. """ @abstractmethod @@ -159,10 +221,10 @@ def copy_to( ) -> None: """Copy a file from local filesystem to the remote Node. - Copy source_file from local filesystem to destination_file - on the remote Node associated with this remote session. + Copy `source_file` from local filesystem to `destination_file` on the remote Node + associated with this remote session. Args: - source_file: the file on the local filesystem. - destination_file: a file or directory path on the remote Node. + source_file: The file on the local filesystem. + destination_file: A file or directory path on the remote Node. """ diff --git a/dts/framework/remote_session/ssh_session.py b/dts/framework/remote_session/ssh_session.py index a467033a13..782220092c 100644 --- a/dts/framework/remote_session/ssh_session.py +++ b/dts/framework/remote_session/ssh_session.py @@ -1,6 +1,8 @@ # SPDX-License-Identifier: BSD-3-Clause # Copyright(c) 2023 PANTHEON.tech s.r.o. +"""SSH remote session.""" + import socket import traceback from pathlib import PurePath @@ -26,13 +28,8 @@ class SSHSession(RemoteSession): """A persistent SSH connection to a remote Node. - The connection is implemented with the Fabric Python library. - - Args: - node_config: The configuration of the Node to connect to. - session_name: The name of the session. - logger: The logger used for logging. - This should be passed from the parent OSSession. + The connection is implemented with + `the Fabric Python library `_. Attributes: session: The underlying Fabric SSH connection. @@ -78,6 +75,7 @@ def _connect(self) -> None: raise SSHConnectionError(self.hostname, errors) def is_alive(self) -> bool: + """Overrides :meth:`~.remote_session.RemoteSession.is_alive`.""" return self.session.is_connected def _send_command(self, command: str, timeout: float, env: dict | None) -> CommandResult: @@ -85,7 +83,7 @@ def _send_command(self, command: str, timeout: float, env: dict | None) -> Comma Args: command: The command to execute. - timeout: Wait at most this many seconds for the execution to complete. + timeout: Wait at most this long in seconds for the command execution to complete. env: Extra environment variables that will be used in command execution. Raises: @@ -110,6 +108,7 @@ def copy_from( source_file: str | PurePath, destination_file: str | PurePath, ) -> None: + """Overrides :meth:`~.remote_session.RemoteSession.copy_from`.""" self.session.get(str(destination_file), str(source_file)) def copy_to( @@ -117,6 +116,7 @@ def copy_to( source_file: str | PurePath, destination_file: str | PurePath, ) -> None: + """Overrides :meth:`~.remote_session.RemoteSession.copy_to`.""" self.session.put(str(source_file), str(destination_file)) def _close(self, force: bool = False) -> None: -- 2.34.1