wehub-resource-sync
240 lines
8.4 KiB
Python
240 lines
8.4 KiB
Python
import codecs
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from typing import Optional, Callable, Any, Generator, List, Union, Tuple
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from e2b.envd.rpc import handle_rpc_exception_with_health
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from e2b.envd.process import process_pb2
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from e2b.exceptions import SandboxException
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from e2b.sandbox.commands.command_handle import (
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CommandExitException,
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CommandResult,
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Stderr,
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Stdout,
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PtyOutput,
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)
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class CommandHandle:
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"""
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Command execution handle.
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It provides methods for waiting for the command to finish, retrieving stdout/stderr, and killing the command.
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"""
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@property
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def pid(self):
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"""
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Command process ID.
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"""
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return self._pid
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def __init__(
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self,
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pid: int,
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handle_kill: Callable[[], bool],
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events: Generator[
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Union[process_pb2.StartResponse, process_pb2.ConnectResponse], Any, None
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],
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handle_send_stdin: Optional[
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Callable[[Union[str, bytes], Optional[float]], None]
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] = None,
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handle_close_stdin: Optional[Callable[[Optional[float]], None]] = None,
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check_health: Optional[Callable[[], Optional[bool]]] = None,
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):
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self._pid = pid
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self._handle_kill = handle_kill
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self._handle_send_stdin = handle_send_stdin
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self._handle_close_stdin = handle_close_stdin
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self._check_health = check_health
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self._events = events
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self._stdout_chunks: List[str] = []
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self._stderr_chunks: List[str] = []
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self._stdout_decoder = codecs.getincrementaldecoder("utf-8")(errors="replace")
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self._stderr_decoder = codecs.getincrementaldecoder("utf-8")(errors="replace")
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self._result: Optional[CommandResult] = None
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self._iteration_exception: Optional[Exception] = None
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def __iter__(self):
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"""
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Iterate over the command output.
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:return: Generator of command outputs
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"""
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return self._handle_events()
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def _flush_decoders(
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self,
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) -> List[Union[Tuple[Stdout, None, None], Tuple[None, Stderr, None]]]:
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"""
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Flush any bytes still buffered in the stream decoders.
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Incomplete trailing UTF-8 sequences are emitted as replacement
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characters, matching the per-chunk decoding behavior.
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"""
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events: List[Union[Tuple[Stdout, None, None], Tuple[None, Stderr, None]]] = []
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out = self._stdout_decoder.decode(b"", final=True)
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if out:
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self._stdout_chunks.append(out)
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events.append((out, None, None))
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err = self._stderr_decoder.decode(b"", final=True)
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if err:
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self._stderr_chunks.append(err)
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events.append((None, err, None))
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return events
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def _handle_events(
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self,
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) -> Generator[
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Union[
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Tuple[Stdout, None, None],
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Tuple[None, Stderr, None],
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Tuple[None, None, PtyOutput],
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],
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None,
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None,
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]:
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try:
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for event in self._events:
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if event.event.HasField("data"):
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if event.event.data.stdout:
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out = self._stdout_decoder.decode(event.event.data.stdout)
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if out:
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self._stdout_chunks.append(out)
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yield out, None, None
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if event.event.data.stderr:
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out = self._stderr_decoder.decode(event.event.data.stderr)
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if out:
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self._stderr_chunks.append(out)
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yield None, out, None
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if event.event.data.pty:
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yield None, None, event.event.data.pty
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if event.event.HasField("end"):
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# Flush trailing decoder bytes into the accumulators and
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# record the result before yielding the flushed chunks, so a
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# consumer that stops iterating on the first flushed chunk
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# still observes the exit code.
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flushed = list(self._flush_decoders())
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self._result = CommandResult(
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stdout="".join(self._stdout_chunks),
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stderr="".join(self._stderr_chunks),
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exit_code=event.event.end.exit_code,
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error=event.event.end.error,
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)
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yield from flushed
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# If the stream closed without an end event (e.g. disconnect or a
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# dropped connection), flush any bytes still buffered in the
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# decoders so incomplete trailing sequences surface as replacement
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# characters instead of being silently dropped.
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if self._result is None:
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yield from self._flush_decoders()
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except Exception as e:
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# The stream raised before an end event (e.g. disconnect or RPC
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# failure). Flush any bytes still buffered in the decoders so
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# incomplete trailing sequences surface as replacement characters
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# instead of being silently dropped, then surface the error.
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yield from self._flush_decoders()
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raise handle_rpc_exception_with_health(e, self._check_health)
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def disconnect(self) -> None:
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"""
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Disconnect from the command.
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The command is not killed, but SDK stops receiving events from the command.
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You can reconnect to the command using `sandbox.commands.connect` method.
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"""
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self._events.close()
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def wait(
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self,
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on_pty: Optional[Callable[[PtyOutput], None]] = None,
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on_stdout: Optional[Callable[[str], None]] = None,
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on_stderr: Optional[Callable[[str], None]] = None,
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) -> CommandResult:
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"""
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Wait for the command to finish and returns the result.
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If the command exits with a non-zero exit code, it throws a `CommandExitException`.
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:param on_pty: Callback for pty output
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:param on_stdout: Callback for stdout output
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:param on_stderr: Callback for stderr output
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:return: `CommandResult` result of command execution
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"""
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try:
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for stdout, stderr, pty in self:
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if stdout is not None and on_stdout:
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on_stdout(stdout)
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elif stderr is not None and on_stderr:
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on_stderr(stderr)
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elif pty is not None and on_pty:
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on_pty(pty)
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except StopIteration:
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pass
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except Exception as e:
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self._iteration_exception = handle_rpc_exception_with_health(
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e, self._check_health
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)
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if self._iteration_exception:
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raise self._iteration_exception
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if self._result is None:
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raise Exception("Command ended without an end event")
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if self._result.exit_code != 0:
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raise CommandExitException(
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stdout="".join(self._stdout_chunks),
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stderr="".join(self._stderr_chunks),
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exit_code=self._result.exit_code,
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error=self._result.error,
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)
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return self._result
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def kill(self) -> bool:
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"""
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Kills the command.
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It uses `SIGKILL` signal to kill the command.
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:return: Whether the command was killed successfully
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"""
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return self._handle_kill()
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def send_stdin(
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self,
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data: Union[str, bytes],
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request_timeout: Optional[float] = None,
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) -> None:
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"""
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Send data to the command stdin.
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The command must have been started with `stdin=True`.
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:param data: Data to send to the command
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:param request_timeout: Timeout for the request in **seconds**
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"""
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if self._handle_send_stdin is None:
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raise SandboxException(
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"Sending stdin is not supported for this command handle."
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)
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self._handle_send_stdin(data, request_timeout)
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def close_stdin(self, request_timeout: Optional[float] = None) -> None:
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"""
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Close the command stdin.
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This signals EOF to the command. The command must have been started with `stdin=True`.
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:param request_timeout: Timeout for the request in **seconds**
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"""
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if self._handle_close_stdin is None:
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raise SandboxException(
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"Closing stdin is not supported for this command handle."
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)
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self._handle_close_stdin(request_timeout)
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