| #!/usr/bin/env python3 |
| # |
| # Copyright (C) 2018 Bloomberg LP |
| # |
| # This program is free software; you can redistribute it and/or |
| # modify it under the terms of the GNU Lesser General Public |
| # License as published by the Free Software Foundation; either |
| # version 2 of the License, or (at your option) any later version. |
| # |
| # This library is distributed in the hope that it will be useful, |
| # but WITHOUT ANY WARRANTY; without even the implied warranty of |
| # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| # Lesser General Public License for more details. |
| # |
| # You should have received a copy of the GNU Lesser General Public |
| # License along with this library. If not, see <http://www.gnu.org/licenses/>. |
| # |
| # Authors: |
| # Jim MacArthur <jim.macarthur@codethink.co.uk> |
| |
| import shutil |
| from functools import partial |
| |
| import grpc |
| |
| from ._sandboxreapi import SandboxREAPI |
| from .. import _signals |
| from .._protos.build.bazel.remote.execution.v2 import remote_execution_pb2, remote_execution_pb2_grpc |
| from .._protos.google.rpc import code_pb2 |
| from .._exceptions import BstError, SandboxError |
| from .._protos.google.longrunning import operations_pb2, operations_pb2_grpc |
| from .._cas import CASRemote |
| |
| |
| # SandboxRemote() |
| # |
| # This isn't really a sandbox, it's a stub which sends all the sources and build |
| # commands to a remote server and retrieves the results from it. |
| # |
| class SandboxRemote(SandboxREAPI): |
| def __init__(self, *args, **kwargs): |
| super().__init__(*args, **kwargs) |
| |
| context = self._get_context() |
| specs = context.remote_execution_specs |
| if specs is None: |
| return |
| |
| self.storage_spec = specs.storage_spec |
| self.exec_spec = specs.exec_spec |
| self.action_spec = specs.action_spec |
| self.operation_name = None |
| |
| def run_remote_command(self, channel, action_digest): |
| # Sends an execution request to the remote execution server. |
| # |
| # This function blocks until it gets a response from the server. |
| |
| # Try to create a communication channel to the BuildGrid server. |
| stub = remote_execution_pb2_grpc.ExecutionStub(channel) |
| request = remote_execution_pb2.ExecuteRequest( |
| instance_name=self.exec_spec.instance_name, action_digest=action_digest, skip_cache_lookup=False |
| ) |
| |
| def __run_remote_command(stub, execute_request=None, running_operation=None): |
| try: |
| last_operation = None |
| if execute_request is not None: |
| operation_iterator = stub.Execute(execute_request) |
| else: |
| request = remote_execution_pb2.WaitExecutionRequest(name=running_operation.name) |
| operation_iterator = stub.WaitExecution(request) |
| |
| for operation in operation_iterator: |
| if not self.operation_name: |
| self.operation_name = operation.name |
| if operation.done: |
| return operation |
| else: |
| last_operation = operation |
| |
| except grpc.RpcError as e: |
| status_code = e.code() |
| |
| if status_code in ( |
| grpc.StatusCode.INVALID_ARGUMENT, |
| grpc.StatusCode.FAILED_PRECONDITION, |
| grpc.StatusCode.RESOURCE_EXHAUSTED, |
| grpc.StatusCode.INTERNAL, |
| grpc.StatusCode.DEADLINE_EXCEEDED, |
| grpc.StatusCode.UNAVAILABLE, |
| ): |
| raise SandboxError( |
| "Failed contacting remote execution server at {}." |
| "{}: {}".format(self.exec_spec.url, status_code.name, e.details()) |
| ) |
| |
| if running_operation and status_code == grpc.StatusCode.UNIMPLEMENTED: |
| raise SandboxError( |
| "Failed trying to recover from connection loss: " |
| "server does not support operation status polling recovery." |
| ) |
| |
| return last_operation |
| |
| # Set up signal handler to trigger cancel_operation on SIGTERM |
| operation = None |
| with self._get_context().messenger.timed_activity( |
| "Waiting for the remote build to complete", element_name=self._get_element_name() |
| ), _signals.terminator(partial(self.cancel_operation, channel)): |
| operation = __run_remote_command(stub, execute_request=request) |
| if operation is None: |
| return None |
| elif operation.done: |
| return operation |
| while operation is not None and not operation.done: |
| operation = __run_remote_command(stub, running_operation=operation) |
| |
| return operation |
| |
| def cancel_operation(self, channel): |
| # If we don't have the name can't send request. |
| if self.operation_name is None: |
| return |
| |
| stub = operations_pb2_grpc.OperationsStub(channel) |
| request = operations_pb2.CancelOperationRequest(name=str(self.operation_name)) |
| |
| try: |
| stub.CancelOperation(request) |
| except grpc.RpcError as e: |
| if e.code() == grpc.StatusCode.UNIMPLEMENTED or e.code() == grpc.StatusCode.INVALID_ARGUMENT: |
| pass |
| else: |
| raise SandboxError( |
| "Failed trying to send CancelOperation request: " "{} ({})".format(e.details(), e.code().name) |
| ) |
| |
| def _fetch_missing_blobs(self, vdir): |
| context = self._get_context() |
| cascache = context.get_cascache() |
| |
| # Fetch the file blobs |
| dir_digest = vdir._get_digest() |
| required_blobs = cascache.required_blobs_for_directory(dir_digest) |
| |
| local_missing_blobs = cascache.missing_blobs(required_blobs) |
| if local_missing_blobs: |
| with CASRemote(self.storage_spec, cascache) as casremote: |
| cascache.fetch_blobs(casremote, local_missing_blobs) |
| |
| def _execute_action(self, action, flags): |
| stdout, stderr = self._get_output() |
| |
| context = self._get_context() |
| project = self._get_project() |
| cascache = context.get_cascache() |
| artifactcache = context.artifactcache |
| |
| action_digest = cascache.add_object(buffer=action.SerializeToString()) |
| |
| # check action cache download and download if there |
| action_result = self._check_action_cache(action_digest) |
| |
| if not action_result: |
| with CASRemote(self.storage_spec, cascache) as casremote: |
| try: |
| casremote.init() |
| except grpc.RpcError as e: |
| raise SandboxError( |
| "Failed to contact remote execution CAS endpoint at {}: {}".format(self.storage_spec.url, e) |
| ) from e |
| |
| with self._get_context().messenger.timed_activity( |
| "Uploading input root", element_name=self._get_element_name() |
| ): |
| # Determine blobs missing on remote |
| try: |
| input_root_digest = action.input_root_digest |
| missing_blobs = list(cascache.missing_blobs_for_directory(input_root_digest, remote=casremote)) |
| except grpc.RpcError as e: |
| raise SandboxError("Failed to determine missing blobs: {}".format(e)) from e |
| |
| # Check if any blobs are also missing locally (partial artifact) |
| # and pull them from the artifact cache. |
| try: |
| local_missing_blobs = cascache.missing_blobs(missing_blobs) |
| if local_missing_blobs: |
| artifactcache.fetch_missing_blobs(project, local_missing_blobs) |
| except (grpc.RpcError, BstError) as e: |
| raise SandboxError("Failed to pull missing blobs from artifact cache: {}".format(e)) from e |
| |
| # Add command and action messages to blob list to push |
| missing_blobs.append(action.command_digest) |
| missing_blobs.append(action_digest) |
| |
| # Now, push the missing blobs to the remote. |
| try: |
| cascache.send_blobs(casremote, missing_blobs) |
| except grpc.RpcError as e: |
| raise SandboxError("Failed to push source directory to remote: {}".format(e)) from e |
| |
| # Now request to execute the action |
| channel = self.exec_spec.open_channel() |
| with channel: |
| operation = self.run_remote_command(channel, action_digest) |
| action_result = self._extract_action_result(operation) |
| |
| # Fetch outputs |
| with CASRemote(self.storage_spec, cascache) as casremote: |
| for output_directory in action_result.output_directories: |
| tree_digest = output_directory.tree_digest |
| if tree_digest is None or not tree_digest.hash: |
| raise SandboxError("Output directory structure had no digest attached.") |
| |
| # Now do a pull to ensure we have the full directory structure. |
| cascache.pull_tree(casremote, tree_digest) |
| |
| # Fetch stdout and stderr blobs |
| cascache.fetch_blobs(casremote, [action_result.stdout_digest, action_result.stderr_digest]) |
| |
| # Forward remote stdout and stderr |
| if stdout: |
| if action_result.stdout_digest.hash: |
| with cascache.open(action_result.stdout_digest, "r") as f: |
| shutil.copyfileobj(f, stdout) |
| elif action_result.stdout_raw: |
| stdout.write(str(action_result.stdout_raw, "utf-8", errors="ignore")) |
| if stderr: |
| if action_result.stderr_digest.hash: |
| with cascache.open(action_result.stderr_digest, "r") as f: |
| shutil.copyfileobj(f, stderr) |
| elif action_result.stderr_raw: |
| stderr.write(str(action_result.stderr_raw, "utf-8", errors="ignore")) |
| |
| return action_result |
| |
| def _check_action_cache(self, action_digest): |
| # Checks the action cache to see if this artifact has already been built |
| # |
| # Should return either the action response or None if not found, raise |
| # Sandboxerror if other grpc error was raised |
| if not self.action_spec: |
| return None |
| |
| channel = self.action_spec.open_channel() |
| with channel: |
| request = remote_execution_pb2.GetActionResultRequest( |
| instance_name=self.action_spec.instance_name, action_digest=action_digest |
| ) |
| stub = remote_execution_pb2_grpc.ActionCacheStub(channel) |
| try: |
| result = stub.GetActionResult(request) |
| except grpc.RpcError as e: |
| if e.code() != grpc.StatusCode.NOT_FOUND: |
| raise SandboxError("Failed to query action cache: {} ({})".format(e.code(), e.details())) |
| return None |
| else: |
| context = self._get_context() |
| context.messenger.info("Action result found in action cache", element_name=self._get_element_name()) |
| return result |
| |
| @staticmethod |
| def _extract_action_result(operation): |
| if operation is None: |
| # Failure of remote execution, usually due to an error in BuildStream |
| raise SandboxError("No response returned from server") |
| |
| assert not operation.HasField("error") and operation.HasField("response") |
| |
| execution_response = remote_execution_pb2.ExecuteResponse() |
| # The response is expected to be an ExecutionResponse message |
| assert operation.response.Is(execution_response.DESCRIPTOR) |
| |
| operation.response.Unpack(execution_response) |
| |
| if execution_response.status.code != code_pb2.OK: |
| # An unexpected error during execution: the remote execution |
| # system failed at processing the execution request. |
| if execution_response.status.message: |
| raise SandboxError(execution_response.status.message) |
| # Otherwise, report the failure in a more general manner |
| raise SandboxError("Remote server failed at executing the build request.") |
| |
| return execution_response.result |