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[Notes] [Git][BuildGrid/buildgrid][mablanch/61-bazel-support] 5 commits: client/cas.py: Introduce CAS uploader helper class

Title: GitLab

Martin Blanchard pushed to branch mablanch/61-bazel-support at BuildGrid / buildgrid

Commits:

4 changed files:

Changes:

  • buildgrid/_app/bots/temp_directory.py
    ... ... @@ -19,71 +19,94 @@ import tempfile
    19 19
    20 20 
     from google.protobuf import any_pb2
    21 21
    22 
    -from buildgrid.utils import read_file, create_digest, write_fetch_directory, parse_to_pb2_from_fetch
    23 
    -from buildgrid._protos.build.bazel.remote.execution.v2 import remote_execution_pb2, remote_execution_pb2_grpc
    22 
    +from buildgrid.client.cas import upload
    23 
    +from buildgrid._protos.build.bazel.remote.execution.v2 import remote_execution_pb2
    24 24 
     from buildgrid._protos.google.bytestream import bytestream_pb2_grpc
    25 
    +from buildgrid.utils import write_fetch_directory, parse_to_pb2_from_fetch
    26 
    +from buildgrid.utils import output_file_maker, output_directory_maker
    25 27
    26 28
    27 29 
     def work_temp_directory(context, lease):
    28 
    -    """ Bot downloads directories and files into a temp directory,
    29 
    -    then uploads results back to CAS
    30 
    +    """Executes a lease for a build action, using host tools.
    30 31 
         """
    31 32
    32 
    -    parent = context.parent
    33 33 
         stub_bytestream = bytestream_pb2_grpc.ByteStreamStub(context.cas_channel)
    34 
    +    instance_name = context.parent
    35 
    +    logger = context.logger
    34 36
    35 37 
         action_digest = remote_execution_pb2.Digest()
    36 38 
         lease.payload.Unpack(action_digest)
    37 39
    38 
    -    action = remote_execution_pb2.Action()
    40 
    +    action = parse_to_pb2_from_fetch(remote_execution_pb2.Action(),
    41 
    +                                     stub_bytestream, action_digest, instance_name)
    39 42
    40 
    -    action = parse_to_pb2_from_fetch(action, stub_bytestream, action_digest, parent)
    43 
    +    with tempfile.TemporaryDirectory() as temp_directory:
    44 
    +        command = parse_to_pb2_from_fetch(remote_execution_pb2.Command(),
    45 
    +                                          stub_bytestream, action.command_digest, instance_name)
    41 46
    42 
    -    with tempfile.TemporaryDirectory() as temp_dir:
    47 
    +        write_fetch_directory(temp_directory, stub_bytestream,
    48 
    +                              action.input_root_digest, instance_name)
    43 49
    44 
    -        command = remote_execution_pb2.Command()
    45 
    -        command = parse_to_pb2_from_fetch(command, stub_bytestream, action.command_digest, parent)
    46 
    -
    47 
    -        arguments = "cd {} &&".format(temp_dir)
    50 
    +        environment = os.environ.copy()
    51 
    +        for variable in command.environment_variables:
    52 
    +            if variable.name not in ['PATH', 'PWD']:
    53 
    +                environment[variable.name] = variable.value
    48 54
    55 
    +        command_line = list()
    49 56 
             for argument in command.arguments:
    50 
    -            arguments += " {}".format(argument)
    51 
    -
    52 
    -        context.logger.info(arguments)
    53 
    -
    54 
    -        write_fetch_directory(temp_dir, stub_bytestream, action.input_root_digest, parent)
    55 
    -
    56 
    -        proc = subprocess.Popen(arguments,
    57 
    -                                shell=True,
    58 
    -                                stdin=subprocess.PIPE,
    59 
    -                                stdout=subprocess.PIPE)
    60 
    -
    61 
    -        # TODO: Should return the std_out to the user
    62 
    -        proc.communicate()
    63 
    -
    64 
    -        result = remote_execution_pb2.ActionResult()
    65 
    -        requests = []
    66 
    -        for output_file in command.output_files:
    67 
    -            path = os.path.join(temp_dir, output_file)
    68 
    -            chunk = read_file(path)
    69 
    -
    70 
    -            digest = create_digest(chunk)
    71 
    -
    72 
    -            result.output_files.extend([remote_execution_pb2.OutputFile(path=output_file,
    73 
    -                                                                        digest=digest)])
    74 
    -
    75 
    -            requests.append(remote_execution_pb2.BatchUpdateBlobsRequest.Request(
    76 
    -                digest=digest, data=chunk))
    77 
    -
    78 
    -        request = remote_execution_pb2.BatchUpdateBlobsRequest(instance_name=parent,
    79 
    -                                                               requests=requests)
    80 
    -
    81 
    -        stub_cas = remote_execution_pb2_grpc.ContentAddressableStorageStub(context.cas_channel)
    82 
    -        stub_cas.BatchUpdateBlobs(request)
    83 
    -
    84 
    -        result_any = any_pb2.Any()
    85 
    -        result_any.Pack(result)
    86 
    -
    87 
    -        lease.result.CopyFrom(result_any)
    57 
    +            command_line.append(argument.strip())
    58 
    +
    59 
    +        working_directory = None
    60 
    +        if command.working_directory:
    61 
    +            working_directory = os.path.join(temp_directory,
    62 
    +                                             command.working_directory)
    63 
    +            os.makedirs(working_directory, exist_ok=True)
    64 
    +        else:
    65 
    +            working_directory = temp_directory
    66 
    +
    67 
    +        # Ensure that output files structure exists:
    68 
    +        for output_path in command.output_files:
    69 
    +            directory_path = os.path.join(working_directory,
    70 
    +                                          os.path.dirname(output_path))
    71 
    +            os.makedirs(directory_path, exist_ok=True)
    72 
    +
    73 
    +        logger.debug(' '.join(command_line))
    74 
    +
    75 
    +        process = subprocess.Popen(command_line,
    76 
    +                                   cwd=working_directory,
    77 
    +                                   universal_newlines=True,
    78 
    +                                   env=environment,
    79 
    +                                   stdin=subprocess.PIPE,
    80 
    +                                   stdout=subprocess.PIPE)
    81 
    +        # TODO: Should return the stdout and stderr in the ActionResult.
    82 
    +        process.communicate()
    83 
    +
    84 
    +        action_result = remote_execution_pb2.ActionResult()
    85 
    +
    86 
    +        with upload(context.cas_channel, instance=instance_name) as cas:
    87 
    +            for output_path in command.output_files:
    88 
    +                file_path = os.path.join(working_directory, output_path)
    89 
    +                # Missing outputs should simply be omitted in ActionResult:
    90 
    +                if not os.path.isfile(file_path):
    91 
    +                    continue
    92 
    +
    93 
    +                output_file = output_file_maker(file_path, working_directory, cas=cas)
    94 
    +                action_result.output_files.extend([output_file])
    95 
    +
    96 
    +            for output_path in command.output_directories:
    97 
    +                directory_path = os.path.join(working_directory, output_path)
    98 
    +                # Missing outputs should simply be omitted in ActionResult:
    99 
    +                if not os.path.isdir(directory_path):
    100 
    +                    continue
    101 
    +
    102 
    +                # OutputDirectory.path should be relative to the working direcory:
    103 
    +                output_directory = output_directory_maker(directory_path, working_directory, cas=cas)
    104 
    +
    105 
    +                action_result.output_directories.extend([output_directory])
    106 
    +
    107 
    +        action_result_any = any_pb2.Any()
    108 
    +        action_result_any.Pack(action_result)
    109 
    +
    110 
    +        lease.result.CopyFrom(action_result_any)
    88 111
    89 112 
         return lease

  • buildgrid/client/cas.py
    1 
    +# Copyright (C) 2018 Bloomberg LP
    2 
    +#
    3 
    +# Licensed under the Apache License, Version 2.0 (the "License");
    4 
    +# you may not use this file except in compliance with the License.
    5 
    +# You may obtain a copy of the License at
    6 
    +#
    7 
    +#  <http://www.apache.org/licenses/LICENSE-2.0>
    8 
    +#
    9 
    +# Unless required by applicable law or agreed to in writing, software
    10 
    +# distributed under the License is distributed on an "AS IS" BASIS,
    11 
    +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12 
    +# See the License for the specific language governing permissions and
    13 
    +# limitations under the License.
    14 
    +
    15 
    +
    16 
    +from contextlib import contextmanager
    17 
    +import uuid
    18 
    +import os
    19 
    +
    20 
    +from buildgrid.settings import HASH
    21 
    +from buildgrid._protos.build.bazel.remote.execution.v2 import remote_execution_pb2, remote_execution_pb2_grpc
    22 
    +from buildgrid._protos.google.bytestream import bytestream_pb2, bytestream_pb2_grpc
    23 
    +
    24 
    +
    25 
    +@contextmanager
    26 
    +def upload(channel, instance=None, u_uid=None):
    27 
    +    uploader = Uploader(channel, instance=instance, u_uid=u_uid)
    28 
    +    try:
    29 
    +        yield uploader
    30 
    +    finally:
    31 
    +        uploader.flush()
    32 
    +
    33 
    +
    34 
    +class Uploader:
    35 
    +    """Remote CAS files, directories and messages upload helper.
    36 
    +
    37 
    +    The :class:`Uploader` class comes with a generator factory function that can
    38 
    +    be used together with the `with` statement for context management::
    39 
    +
    40 
    +        with upload(channel, instance='build') as cas:
    41 
    +            cas.upload_file('/path/to/local/file')
    42 
    +
    43 
    +    Attributes:
    44 
    +        FILE_SIZE_THRESHOLD (int): maximum size for a queueable file.
    45 
    +        MAX_REQUEST_SIZE (int): maximum size for a single gRPC request.
    46 
    +    """
    47 
    +
    48 
    +    FILE_SIZE_THRESHOLD = 1 * 1024 * 1024
    49 
    +    MAX_REQUEST_SIZE = 2 * 1024 * 1024
    50 
    +
    51 
    +    def __init__(self, channel, instance=None, u_uid=None):
    52 
    +        """Initializes a new :class:`Uploader` instance.
    53 
    +
    54 
    +        Args:
    55 
    +            channel (grpc.Channel): A gRPC channel to the CAS endpoint.
    56 
    +            instance (str, optional): the targeted instance's name.
    57 
    +            u_uid (str, optional): a UUID for CAS transactions.
    58 
    +        """
    59 
    +        self.channel = channel
    60 
    +
    61 
    +        self.instance_name = instance
    62 
    +        if u_uid is not None:
    63 
    +            self.u_uid = u_uid
    64 
    +        else:
    65 
    +            self.u_uid = str(uuid.uuid4())
    66 
    +
    67 
    +        self.__bytestream_stub = bytestream_pb2_grpc.ByteStreamStub(self.channel)
    68 
    +        self.__cas_stub = remote_execution_pb2_grpc.ContentAddressableStorageStub(self.channel)
    69 
    +
    70 
    +        self.__requests = dict()
    71 
    +        self.__request_size = 0
    72 
    +
    73 
    +    def upload_file(self, file_path, queue=True):
    74 
    +        """Stores a local file into the remote CAS storage.
    75 
    +
    76 
    +        If queuing is allowed (`queue=True`), the upload request **may** be
    77 
    +        defer. An explicit call to :method:`flush` can force the request to be
    78 
    +        send immediately (allong with the rest of the queued batch).
    79 
    +
    80 
    +        Args:
    81 
    +            file_path (str): absolute or relative path to a local file.
    82 
    +            queue (bool, optional): wheter or not the upload request may be
    83 
    +                queued and submitted as part of a batch upload request. Defaults
    84 
    +                to True.
    85 
    +
    86 
    +        Returns:
    87 
    +            :obj:`Digest`: The digest of the file's content.
    88 
    +
    89 
    +        Raises:
    90 
    +            OSError: If `file_path` does not exist or is not readable.
    91 
    +        """
    92 
    +        if not os.path.isabs(file_path):
    93 
    +            file_path = os.path.abspath(file_path)
    94 
    +
    95 
    +        with open(file_path, 'rb') as bytes_steam:
    96 
    +            file_bytes = bytes_steam.read()
    97 
    +
    98 
    +        if not queue or len(file_bytes) > Uploader.FILE_SIZE_THRESHOLD:
    99 
    +            blob_digest = self._send_blob(file_bytes)
    100 
    +        else:
    101 
    +            blob_digest = self._queue_blob(file_bytes)
    102 
    +
    103 
    +        return blob_digest
    104 
    +
    105 
    +    def upload_directory(self, directory, queue=True):
    106 
    +        """Stores a :obj:`Directory` into the remote CAS storage.
    107 
    +
    108 
    +        If queuing is allowed (`queue=True`), the upload request **may** be
    109 
    +        defer. An explicit call to :method:`flush` can force the request to be
    110 
    +        send immediately (allong with the rest of the queued batch).
    111 
    +
    112 
    +        Args:
    113 
    +            directory (:obj:`Directory`): a :obj:`Directory` object.
    114 
    +            queue (bool, optional): wheter or not the upload request may be
    115 
    +                queued and submitted as part of a batch upload request. Defaults
    116 
    +                to True.
    117 
    +
    118 
    +        Returns:
    119 
    +            :obj:`Digest`: The digest of the :obj:`Directory`.
    120 
    +        """
    121 
    +        if not isinstance(directory, remote_execution_pb2.Directory):
    122 
    +            raise TypeError
    123 
    +
    124 
    +        if not queue:
    125 
    +            return self._send_blob(directory.SerializeToString())
    126 
    +        else:
    127 
    +            return self._queue_blob(directory.SerializeToString())
    128 
    +
    129 
    +    def send_message(self, message):
    130 
    +        """Stores a message into the remote CAS storage.
    131 
    +
    132 
    +        Args:
    133 
    +            message (:obj:`Message`): a protobuf message object.
    134 
    +
    135 
    +        Returns:
    136 
    +            :obj:`Digest`: The digest of the message.
    137 
    +        """
    138 
    +        return self._send_blob(message.SerializeToString())
    139 
    +
    140 
    +    def flush(self):
    141 
    +        """Ensures any queued request gets sent."""
    142 
    +        if self.__requests:
    143 
    +            self._send_batch()
    144 
    +
    145 
    +    def _queue_blob(self, blob):
    146 
    +        """Queues a memory block for later batch upload"""
    147 
    +        blob_digest = remote_execution_pb2.Digest()
    148 
    +        blob_digest.hash = HASH(blob).hexdigest()
    149 
    +        blob_digest.size_bytes = len(blob)
    150 
    +
    151 
    +        if self.__request_size + len(blob) > Uploader.MAX_REQUEST_SIZE:
    152 
    +            self._send_batch()
    153 
    +
    154 
    +        update_request = remote_execution_pb2.BatchUpdateBlobsRequest.Request()
    155 
    +        update_request.digest.CopyFrom(blob_digest)
    156 
    +        update_request.data = blob
    157 
    +
    158 
    +        update_request_size = update_request.ByteSize()
    159 
    +        if self.__request_size + update_request_size > Uploader.MAX_REQUEST_SIZE:
    160 
    +            self._send_batch()
    161 
    +
    162 
    +        self.__requests[update_request.digest.hash] = update_request
    163 
    +        self.__request_size += update_request_size
    164 
    +
    165 
    +        return blob_digest
    166 
    +
    167 
    +    def _send_blob(self, blob):
    168 
    +        """Sends a memory block using ByteStream.Write()"""
    169 
    +        blob_digest = remote_execution_pb2.Digest()
    170 
    +        blob_digest.hash = HASH(blob).hexdigest()
    171 
    +        blob_digest.size_bytes = len(blob)
    172 
    +
    173 
    +        if self.instance_name is not None:
    174 
    +            resource_name = '/'.join([self.instance_name, 'uploads', self.u_uid, 'blobs',
    175 
    +                                      blob_digest.hash, str(blob_digest.size_bytes)])
    176 
    +        else:
    177 
    +            resource_name = '/'.join(['uploads', self.u_uid, 'blobs',
    178 
    +                                      blob_digest.hash, str(blob_digest.size_bytes)])
    179 
    +
    180 
    +        def __write_request_stream(resource, content):
    181 
    +            offset = 0
    182 
    +            finished = False
    183 
    +            remaining = len(content)
    184 
    +            while not finished:
    185 
    +                chunk_size = min(remaining, 64 * 1024)
    186 
    +                remaining -= chunk_size
    187 
    +
    188 
    +                request = bytestream_pb2.WriteRequest()
    189 
    +                request.resource_name = resource
    190 
    +                request.data = content[offset:offset + chunk_size]
    191 
    +                request.write_offset = offset
    192 
    +                request.finish_write = remaining <= 0
    193 
    +
    194 
    +                yield request
    195 
    +
    196 
    +                offset += chunk_size
    197 
    +                finished = request.finish_write
    198 
    +
    199 
    +        write_resquests = __write_request_stream(resource_name, blob)
    200 
    +        # TODO: Handle connection loss/recovery using QueryWriteStatus()
    201 
    +        write_response = self.__bytestream_stub.Write(write_resquests)
    202 
    +
    203 
    +        assert write_response.committed_size == blob_digest.size_bytes
    204 
    +
    205 
    +        return blob_digest
    206 
    +
    207 
    +    def _send_batch(self):
    208 
    +        """Sends queued data using ContentAddressableStorage.BatchUpdateBlobs()"""
    209 
    +        batch_request = remote_execution_pb2.BatchUpdateBlobsRequest()
    210 
    +        batch_request.requests.extend(self.__requests.values())
    211 
    +        if self.instance_name is not None:
    212 
    +            batch_request.instance_name = self.instance_name
    213 
    +
    214 
    +        batch_response = self.__cas_stub.BatchUpdateBlobs(batch_request)
    215 
    +
    216 
    +        for response in batch_response.responses:
    217 
    +            assert response.digest.hash in self.__requests
    218 
    +            assert response.status.code is 0
    219 
    +
    220 
    +        self.__requests.clear()
    221 
    +        self.__request_size = 0

  • buildgrid/server/execution/execution_service.py
    ... ... @@ -86,6 +86,11 @@ class ExecutionService(remote_execution_pb2_grpc.ExecutionServicer):
    86 86 
                 yield operations_pb2.Operation()
    87 87
    88 88 
         def _get_instance(self, name):
    89 
    +        # If client does not support multiple instances, it may omit the
    90 
    +        # instance name request parameter, so better map our default:
    91 
    +        if not name and len(self._instances) == 1:
    92 
    +            name = next(iter(self._instances))
    93 
    +
    89 94 
             try:
    90 95 
                 return self._instances[name]
    91 96

  • buildgrid/utils.py
    ... ... @@ -13,6 +13,7 @@
    13 13 
     # limitations under the License.
    14 14
    15 15
    16 
    +from operator import attrgetter
    16 17 
     import os
    17 18
    18 19 
     from buildgrid.settings import HASH
    ... ... @@ -99,7 +100,15 @@ def parse_to_pb2_from_fetch(pb2, stub, digest, instance_name=""):
    99 100
    100 101
    101 102 
     def create_digest(bytes_to_digest):
    102 
    -    """ Creates a hash based on the hex digest and returns the digest
    103 
    +    """Computes the :obj:`Digest` of a piece of data.
    104 
    +
    105 
    +    The :obj:`Digest` of a data is a function of its hash **and** size.
    106 
    +
    107 
    +    Args:
    108 
    +        bytes_to_digest (bytes): byte data to digest.
    109 
    +
    110 
    +    Returns:
    111 
    +        :obj:`Digest`: The gRPC :obj:`Digest` for the given byte data.
    103 112 
         """
    104 113 
         return remote_execution_pb2.Digest(hash=HASH(bytes_to_digest).hexdigest(),
    105 114 
                                            size_bytes=len(bytes_to_digest))
    ... ... @@ -136,6 +145,200 @@ def file_maker(file_path, file_digest):
    136 145 
                                              is_executable=os.access(file_path, os.X_OK))
    137 146
    138 147
    139 
    -def read_file(read):
    140 
    -    with open(read, 'rb') as f:
    141 
    -        return f.read()
    148 
    +def directory_maker(directory_path, child_directories=None, cas=None, upload_directories=True):
    149 
    +    """Creates a :obj:`Directory` from a local directory and possibly upload it.
    150 
    +
    151 
    +    Args:
    152 
    +        directory_path (str): absolute or relative path to a local directory.
    153 
    +        child_directories (list): output list of of children :obj:`Directory`
    154 
    +            objects.
    155 
    +        cas (:obj:`Uploader`): a CAS client uploader.
    156 
    +        upload_directories (bool): wheter or not to upload the :obj:`Directory`
    157 
    +            objects along with the files.
    158 
    +
    159 
    +    Returns:
    160 
    +        :obj:`Directory`, :obj:`Digest`: Tuple of a new gRPC :obj:`Directory`
    161 
    +        for the local directory pointed by `directory_path` and the digest
    162 
    +        for that object.
    163 
    +    """
    164 
    +    if not os.path.isabs(directory_path):
    165 
    +        directory_path = os.path.abspath(directory_path)
    166 
    +
    167 
    +    files, directories, symlinks = list(), list(), list()
    168 
    +    for directory_entry in os.scandir(directory_path):
    169 
    +        # Create a FileNode and corresponding BatchUpdateBlobsRequest:
    170 
    +        if directory_entry.is_file(follow_symlinks=False):
    171 
    +            if cas is not None:
    172 
    +                node_digest = cas.upload_file(directory_entry.path)
    173 
    +            else:
    174 
    +                node_digest = create_digest(read_file(directory_entry.path))
    175 
    +
    176 
    +            node = remote_execution_pb2.FileNode()
    177 
    +            node.name = directory_entry.name
    178 
    +            node.digest.CopyFrom(node_digest)
    179 
    +            node.is_executable = os.access(directory_entry.path, os.X_OK)
    180 
    +
    181 
    +            files.append(node)
    182 
    +
    183 
    +        # Create a DirectoryNode and corresponding BatchUpdateBlobsRequest:
    184 
    +        elif directory_entry.is_dir(follow_symlinks=False):
    185 
    +            _, node_digest = directory_maker(directory_entry.path,
    186 
    +                                             child_directories=child_directories,
    187 
    +                                             upload_directories=upload_directories,
    188 
    +                                             cas=cas)
    189 
    +
    190 
    +            node = remote_execution_pb2.DirectoryNode()
    191 
    +            node.name = directory_entry.name
    192 
    +            node.digest.CopyFrom(node_digest)
    193 
    +
    194 
    +            directories.append(node)
    195 
    +
    196 
    +        # Create a SymlinkNode if necessary;
    197 
    +        elif os.path.islink(directory_entry.path):
    198 
    +            node_target = os.readlink(directory_entry.path)
    199 
    +
    200 
    +            node = remote_execution_pb2.SymlinkNode()
    201 
    +            node.name = directory_entry.name
    202 
    +            node.target = node_target
    203 
    +
    204 
    +            symlinks.append(node)
    205 
    +
    206 
    +    files.sort(key=attrgetter('name'))
    207 
    +    directories.sort(key=attrgetter('name'))
    208 
    +    symlinks.sort(key=attrgetter('name'))
    209 
    +
    210 
    +    directory = remote_execution_pb2.Directory()
    211 
    +    directory.files.extend(files)
    212 
    +    directory.directories.extend(directories)
    213 
    +    directory.symlinks.extend(symlinks)
    214 
    +
    215 
    +    if child_directories is not None:
    216 
    +        child_directories.append(directory)
    217 
    +
    218 
    +    if cas is not None and upload_directories:
    219 
    +        directory_digest = cas.upload_directory(directory)
    220 
    +    else:
    221 
    +        directory_digest = create_digest(directory.SerializeToString())
    222 
    +
    223 
    +    return directory, directory_digest
    224 
    +
    225 
    +
    226 
    +def tree_maker(directory_path, cas=None):
    227 
    +    """Creates a :obj:`Tree` from a local directory and possibly upload it.
    228 
    +
    229 
    +    If `cas` is specified, the local directory content will be uploded/stored
    230 
    +    in remote CAS (the :obj:`Tree` message won't).
    231 
    +
    232 
    +    Args:
    233 
    +        directory_path (str): absolute or relative path to a local directory.
    234 
    +        cas (:obj:`Uploader`): a CAS client uploader.
    235 
    +
    236 
    +    Returns:
    237 
    +        :obj:`Tree`, :obj:`Digest`: Tuple of a new gRPC :obj:`Tree` for the
    238 
    +        local directory pointed by `directory_path` and the digest for that
    239 
    +        object.
    240 
    +    """
    241 
    +    if not os.path.isabs(directory_path):
    242 
    +        directory_path = os.path.abspath(directory_path)
    243 
    +
    244 
    +    child_directories = list()
    245 
    +    directory, _ = directory_maker(directory_path,
    246 
    +                                   child_directories=child_directories,
    247 
    +                                   upload_directories=False,
    248 
    +                                   cas=cas)
    249 
    +
    250 
    +    tree = remote_execution_pb2.Tree()
    251 
    +    tree.children.extend(child_directories)
    252 
    +    tree.root.CopyFrom(directory)
    253 
    +
    254 
    +    if cas is not None:
    255 
    +        tree_digest = cas.send_message(tree)
    256 
    +    else:
    257 
    +        tree_digest = create_digest(tree.SerializeToString())
    258 
    +
    259 
    +    return tree, tree_digest
    260 
    +
    261 
    +
    262 
    +def read_file(file_path):
    263 
    +    """Loads raw file content in memory.
    264 
    +
    265 
    +    Args:
    266 
    +        file_path (str): path to the target file.
    267 
    +
    268 
    +    Returns:
    269 
    +        bytes: Raw file's content until EOF.
    270 
    +
    271 
    +    Raises:
    272 
    +        OSError: If `file_path` does not exist or is not readable.
    273 
    +    """
    274 
    +    with open(file_path, 'rb') as byte_file:
    275 
    +        return byte_file.read()
    276 
    +
    277 
    +
    278 
    +def output_file_maker(file_path, input_path, cas=None):
    279 
    +    """Creates an :obj:`OutputFile` from a local file and possibly upload it.
    280 
    +
    281 
    +    If `cas` is specified, the local file will be uploded/stored in remote CAS
    282 
    +    (the :obj:`OutputFile` message won't).
    283 
    +
    284 
    +    Note:
    285 
    +        `file_path` **must** point inside or be relative to `input_path`.
    286 
    +
    287 
    +    Args:
    288 
    +        file_path (str): absolute or relative path to a local file.
    289 
    +        input_path (str): absolute or relative path to the input root directory.
    290 
    +        cas (:obj:`Uploader`): a CAS client uploader.
    291 
    +
    292 
    +    Returns:
    293 
    +        :obj:`OutputFile`: a new gRPC :obj:`OutputFile` object for the file
    294 
    +        pointed by `file_path`.
    295 
    +    """
    296 
    +    if not os.path.isabs(file_path):
    297 
    +        file_path = os.path.abspath(file_path)
    298 
    +    if not os.path.isabs(input_path):
    299 
    +        input_path = os.path.abspath(input_path)
    300 
    +
    301 
    +    if cas is not None:
    302 
    +        file_digest = cas.upload_file(file_path)
    303 
    +    else:
    304 
    +        file_digest = create_digest(read_file(file_path))
    305 
    +
    306 
    +    output_file = remote_execution_pb2.OutputFile()
    307 
    +    output_file.digest.CopyFrom(file_digest)
    308 
    +    # OutputFile.path should be relative to the working direcory:
    309 
    +    output_file.path = os.path.relpath(file_path, start=input_path)
    310 
    +    output_file.is_executable = os.access(file_path, os.X_OK)
    311 
    +
    312 
    +    return output_file
    313 
    +
    314 
    +
    315 
    +def output_directory_maker(directory_path, working_path, cas=None):
    316 
    +    """Creates an :obj:`OutputDirectory` from a local directory.
    317 
    +
    318 
    +    If `cas` is specified, the local directory content will be uploded/stored
    319 
    +    in remote CAS (the :obj:`OutputDirectory` message won't).
    320 
    +
    321 
    +    Note:
    322 
    +        `directory_path` **must** point inside or be relative to `input_path`.
    323 
    +
    324 
    +    Args:
    325 
    +        directory_path (str): absolute or relative path to a local directory.
    326 
    +        working_path (str): absolute or relative path to the working directory.
    327 
    +        cas (:obj:`Uploader`): a CAS client uploader.
    328 
    +
    329 
    +    Returns:
    330 
    +        :obj:`OutputDirectory`: a new gRPC :obj:`OutputDirectory` for the
    331 
    +        directory pointed by `directory_path`.
    332 
    +    """
    333 
    +    if not os.path.isabs(directory_path):
    334 
    +        directory_path = os.path.abspath(directory_path)
    335 
    +    if not os.path.isabs(working_path):
    336 
    +        working_path = os.path.abspath(working_path)
    337 
    +
    338 
    +    _, tree_digest = tree_maker(directory_path, cas=cas)
    339 
    +
    340 
    +    output_directory = remote_execution_pb2.OutputDirectory()
    341 
    +    output_directory.tree_digest.CopyFrom(tree_digest)
    342 
    +    output_directory.path = os.path.relpath(directory_path, start=working_path)
    343 
    +
    344 
    +    return output_directory

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