-# The MIT License (MIT)
+# SPDX-License-Identifier: MIT
#
-# Copyright (
c) 2019 Philippe Proulx <pproulx@efficios.com>
+# Copyright (
C) 2019 Philippe Proulx <pproulx@efficios.com>
#
-# Permission is hereby granted, free of charge, to any person obtaining a copy
-# of this software and associated documentation files (the "Software"), to deal
-# in the Software without restriction, including without limitation the rights
-# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-# copies of the Software, and to permit persons to whom the Software is
-# furnished to do so, subject to the following conditions:
-#
-# The above copyright notice and this permission notice shall be included in
-# all copies or substantial portions of the Software.
-#
-# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-# THE SOFTWARE.
-import argparse
-import collections.abc
-import logging
+# pyright: strict, reportTypeCommentUsage=false, reportMissingTypeStubs=false
+
import os
-import os.path
import re
+import sys
import socket
import struct
-import sys
+import logging
+import os.path
+import argparse
import tempfile
+from typing import Dict, Union, Iterable, Optional, Sequence, overload
+
+import tjson
+
+# isort: off
+from typing import Any, Callable # noqa: F401
+
+# isort: on
class UnexpectedInput(RuntimeError):
pass
+# An entry within the index of an LTTng data stream.
+class _LttngDataStreamIndexEntry:
+ def __init__(
+ self,
+ offset_bytes: int,
+ total_size_bits: int,
+ content_size_bits: int,
+ timestamp_begin: int,
+ timestamp_end: int,
+ events_discarded: int,
+ stream_class_id: int,
+ ):
+ self._offset_bytes = offset_bytes
+ self._total_size_bits = total_size_bits
+ self._content_size_bits = content_size_bits
+ self._timestamp_begin = timestamp_begin
+ self._timestamp_end = timestamp_end
+ self._events_discarded = events_discarded
+ self._stream_class_id = stream_class_id
+
+ @property
+ def offset_bytes(self):
+ return self._offset_bytes
+
+ @property
+ def total_size_bits(self):
+ return self._total_size_bits
+
+ @property
+ def total_size_bytes(self):
+ return self._total_size_bits // 8
+
+ @property
+ def content_size_bits(self):
+ return self._content_size_bits
+
+ @property
+ def content_size_bytes(self):
+ return self._content_size_bits // 8
+
+ @property
+ def timestamp_begin(self):
+ return self._timestamp_begin
+
+ @property
+ def timestamp_end(self):
+ return self._timestamp_end
+
+ @property
+ def events_discarded(self):
+ return self._events_discarded
+
+ @property
+ def stream_class_id(self):
+ return self._stream_class_id
+
+
+# An entry within the index of an LTTng data stream. While a stream beacon entry
+# is conceptually unrelated to an index, it is sent as a reply to a
+# LttngLiveViewerGetNextDataStreamIndexEntryCommand
+class _LttngDataStreamBeaconIndexEntry:
+ def __init__(self, stream_class_id: int, timestamp: int):
+ self._stream_class_id = stream_class_id
+ self._timestamp = timestamp
+
+ @property
+ def timestamp(self):
+ return self._timestamp
+
+ @property
+ def stream_class_id(self):
+ return self._stream_class_id
+
+
+_LttngIndexEntryT = Union[_LttngDataStreamIndexEntry, _LttngDataStreamBeaconIndexEntry]
+
+
class _LttngLiveViewerCommand:
- def __init__(self, version):
+ def __init__(self, version: int):
self._version = version
@property
class _LttngLiveViewerConnectCommand(_LttngLiveViewerCommand):
- def __init__(self, version, viewer_session_id, major, minor):
+ def __init__(self, version: int, viewer_session_id: int, major: int, minor: int):
super().__init__(version)
self._viewer_session_id = viewer_session_id
self._major = major
return self._minor
-class _LttngLiveViewerConnectReply:
- def __init__(self, viewer_session_id, major, minor):
+class _LttngLiveViewerReply:
+ pass
+
+
+class _LttngLiveViewerConnectReply(_LttngLiveViewerReply):
+ def __init__(self, viewer_session_id: int, major: int, minor: int):
self._viewer_session_id = viewer_session_id
self._major = major
self._minor = minor
class _LttngLiveViewerTracingSessionInfo:
def __init__(
self,
- tracing_session_id,
- live_timer_freq,
- client_count,
- stream_count,
- hostname,
- name,
+ tracing_session_id: int,
+ live_timer_freq: int,
+ client_count: int,
+ stream_count: int,
+ hostname: str,
+ name: str,
):
self._tracing_session_id = tracing_session_id
self._live_timer_freq = live_timer_freq
return self._name
-class _LttngLiveViewerGetTracingSessionInfosReply:
- def __init__(self, tracing_session_infos):
+class _LttngLiveViewerGetTracingSessionInfosReply(_LttngLiveViewerReply):
+ def __init__(
+ self, tracing_session_infos: Sequence[_LttngLiveViewerTracingSessionInfo]
+ ):
self._tracing_session_infos = tracing_session_infos
@property
BEGINNING = 1
LAST = 2
- def __init__(self, version, tracing_session_id, offset, seek_type):
+ def __init__(
+ self, version: int, tracing_session_id: int, offset: int, seek_type: int
+ ):
super().__init__(version)
self._tracing_session_id = tracing_session_id
self._offset = offset
class _LttngLiveViewerStreamInfo:
- def __init__(self, id, trace_id, is_metadata, path, channel_name):
+ def __init__(
+ self, id: int, trace_id: int, is_metadata: bool, path: str, channel_name: str
+ ):
self._id = id
self._trace_id = trace_id
self._is_metadata = is_metadata
return self._channel_name
-class _LttngLiveViewerAttachToTracingSessionReply:
+class _LttngLiveViewerAttachToTracingSessionReply(_LttngLiveViewerReply):
class Status:
OK = 1
ALREADY = 2
SEEK_ERROR = 5
NO_SESSION = 6
- def __init__(self, status, stream_infos):
+ def __init__(self, status: int, stream_infos: Sequence[_LttngLiveViewerStreamInfo]):
self._status = status
self._stream_infos = stream_infos
class _LttngLiveViewerGetNextDataStreamIndexEntryCommand(_LttngLiveViewerCommand):
- def __init__(self, version, stream_id):
+ def __init__(self, version: int, stream_id: int):
super().__init__(version)
self._stream_id = stream_id
return self._stream_id
-class _LttngLiveViewerGetNextDataStreamIndexEntryReply:
+class _LttngLiveViewerGetNextDataStreamIndexEntryReply(_LttngLiveViewerReply):
class Status:
OK = 1
RETRY = 2
INACTIVE = 5
EOF = 6
- def __init__(self, status, index_entry, has_new_metadata, has_new_data_stream):
+ def __init__(
+ self,
+ status: int,
+ index_entry: _LttngIndexEntryT,
+ has_new_metadata: bool,
+ has_new_data_stream: bool,
+ ):
self._status = status
self._index_entry = index_entry
self._has_new_metadata = has_new_metadata
class _LttngLiveViewerGetDataStreamPacketDataCommand(_LttngLiveViewerCommand):
- def __init__(self, version, stream_id, offset, req_length):
+ def __init__(self, version: int, stream_id: int, offset: int, req_length: int):
super().__init__(version)
self._stream_id = stream_id
self._offset = offset
return self._req_length
-class _LttngLiveViewerGetDataStreamPacketDataReply:
+class _LttngLiveViewerGetDataStreamPacketDataReply(_LttngLiveViewerReply):
class Status:
OK = 1
RETRY = 2
ERROR = 3
EOF = 4
- def __init__(self, status, data, has_new_metadata, has_new_data_stream):
+ def __init__(
+ self,
+ status: int,
+ data: bytes,
+ has_new_metadata: bool,
+ has_new_data_stream: bool,
+ ):
self._status = status
self._data = data
self._has_new_metadata = has_new_metadata
class _LttngLiveViewerGetMetadataStreamDataCommand(_LttngLiveViewerCommand):
- def __init__(self, version, stream_id):
+ def __init__(self, version: int, stream_id: int):
super().__init__(version)
self._stream_id = stream_id
return self._stream_id
-class _LttngLiveViewerGetMetadataStreamDataContentReply:
+class _LttngLiveViewerGetMetadataStreamDataContentReply(_LttngLiveViewerReply):
class Status:
OK = 1
NO_NEW = 2
ERROR = 3
- def __init__(self, status, data):
+ def __init__(self, status: int, data: bytes):
self._status = status
self._data = data
class _LttngLiveViewerGetNewStreamInfosCommand(_LttngLiveViewerCommand):
- def __init__(self, version, tracing_session_id):
+ def __init__(self, version: int, tracing_session_id: int):
super().__init__(version)
self._tracing_session_id = tracing_session_id
return self._tracing_session_id
-class _LttngLiveViewerGetNewStreamInfosReply:
+class _LttngLiveViewerGetNewStreamInfosReply(_LttngLiveViewerReply):
class Status:
OK = 1
NO_NEW = 2
ERROR = 3
HUP = 4
- def __init__(self, status, stream_infos):
+ def __init__(self, status: int, stream_infos: Sequence[_LttngLiveViewerStreamInfo]):
self._status = status
self._stream_infos = stream_infos
pass
-class _LttngLiveViewerCreateViewerSessionReply:
+class _LttngLiveViewerCreateViewerSessionReply(_LttngLiveViewerReply):
class Status:
OK = 1
ERROR = 2
- def __init__(self, status):
+ def __init__(self, status: int):
self._status = status
@property
class _LttngLiveViewerDetachFromTracingSessionCommand(_LttngLiveViewerCommand):
- def __init__(self, version, tracing_session_id):
+ def __init__(self, version: int, tracing_session_id: int):
super().__init__(version)
self._tracing_session_id = tracing_session_id
return self._tracing_session_id
-class _LttngLiveViewerDetachFromTracingSessionReply:
+class _LttngLiveViewerDetachFromTracingSessionReply(_LttngLiveViewerReply):
class Status:
OK = 1
UNKNOWN = 2
ERROR = 3
- def __init__(self, status):
+ def __init__(self, status: int):
self._status = status
@property
# An LTTng live protocol codec can convert bytes to command objects and
# reply objects to bytes.
class _LttngLiveViewerProtocolCodec:
- _COMMAND_HEADER_STRUCT_FMT = 'QII'
+ _COMMAND_HEADER_STRUCT_FMT = "QII"
_COMMAND_HEADER_SIZE_BYTES = struct.calcsize(_COMMAND_HEADER_STRUCT_FMT)
def __init__(self):
pass
- def _unpack(self, fmt, data, offset=0):
- fmt = '!' + fmt
+ def _unpack(self, fmt: str, data: bytes, offset: int = 0):
+ fmt = "!" + fmt
return struct.unpack_from(fmt, data, offset)
- def _unpack_payload(self, fmt, data):
+ def _unpack_payload(self, fmt: str, data: bytes):
return self._unpack(
fmt, data, _LttngLiveViewerProtocolCodec._COMMAND_HEADER_SIZE_BYTES
)
- def decode(self, data):
+ def decode(self, data: bytes):
if len(data) < self._COMMAND_HEADER_SIZE_BYTES:
# Not enough data to read the command header
return
self._COMMAND_HEADER_STRUCT_FMT, data
)
logging.info(
- 'Decoded command header: payload-size={}, cmd-type={}, version={}'.format(
+ "Decoded command header: payload-size={}, cmd-type={}, version={}".format(
payload_size, cmd_type, version
)
)
return
if cmd_type == 1:
- viewer_session_id, major, minor, conn_type = self._unpack_payload(
- 'QIII', data
- )
+ viewer_session_id, major, minor, _ = self._unpack_payload("QIII", data)
return _LttngLiveViewerConnectCommand(
version, viewer_session_id, major, minor
)
elif cmd_type == 2:
return _LttngLiveViewerGetTracingSessionInfosCommand(version)
elif cmd_type == 3:
- tracing_session_id, offset, seek_type = self._unpack_payload('QQI', data)
+ tracing_session_id, offset, seek_type = self._unpack_payload("QQI", data)
return _LttngLiveViewerAttachToTracingSessionCommand(
version, tracing_session_id, offset, seek_type
)
elif cmd_type == 4:
- stream_id, = self._unpack_payload('Q', data)
+ (stream_id,) = self._unpack_payload("Q", data)
return _LttngLiveViewerGetNextDataStreamIndexEntryCommand(
version, stream_id
)
elif cmd_type == 5:
- stream_id, offset, req_length = self._unpack_payload('QQI', data)
+ stream_id, offset, req_length = self._unpack_payload("QQI", data)
return _LttngLiveViewerGetDataStreamPacketDataCommand(
version, stream_id, offset, req_length
)
elif cmd_type == 6:
- stream_id, = self._unpack_payload('Q', data)
+ (stream_id,) = self._unpack_payload("Q", data)
return _LttngLiveViewerGetMetadataStreamDataCommand(version, stream_id)
elif cmd_type == 7:
- tracing_session_id, = self._unpack_payload('Q', data)
+ (tracing_session_id,) = self._unpack_payload("Q", data)
return _LttngLiveViewerGetNewStreamInfosCommand(version, tracing_session_id)
elif cmd_type == 8:
return _LttngLiveViewerCreateViewerSessionCommand(version)
elif cmd_type == 9:
- tracing_session_id, = self._unpack_payload('Q', data)
+ (tracing_session_id,) = self._unpack_payload("Q", data)
return _LttngLiveViewerDetachFromTracingSessionCommand(
version, tracing_session_id
)
else:
- raise UnexpectedInput('Unknown command type {}'.format(cmd_type))
+ raise UnexpectedInput("Unknown command type {}".format(cmd_type))
- def _pack(self, fmt, *args):
+ def _pack(self, fmt: str, *args: Any):
# Force network byte order
- return struct.pack('!' + fmt, *args)
+ return struct.pack("!" + fmt, *args)
- def _encode_zero_padded_str(self, string, length):
+ def _encode_zero_padded_str(self, string: str, length: int):
data = string.encode()
- return data.ljust(length, b'\x00')
+ return data.ljust(length, b"\x00")
- def _encode_stream_info(self, info):
- data = self._pack('QQI', info.id, info.trace_id, int(info.is_metadata))
+ def _encode_stream_info(self, info: _LttngLiveViewerStreamInfo):
+ data = self._pack("QQI", info.id, info.trace_id, int(info.is_metadata))
data += self._encode_zero_padded_str(info.path, 4096)
data += self._encode_zero_padded_str(info.channel_name, 255)
return data
- def _get_has_new_stuff_flags(self, has_new_metadata, has_new_data_streams):
+ def _get_has_new_stuff_flags(
+ self, has_new_metadata: bool, has_new_data_streams: bool
+ ):
flags = 0
if has_new_metadata:
return flags
- def encode(self, reply):
+ def encode(
+ self,
+ reply: _LttngLiveViewerReply,
+ ) -> bytes:
if type(reply) is _LttngLiveViewerConnectReply:
data = self._pack(
- 'QIII', reply.viewer_session_id, reply.major, reply.minor, 2
+ "QIII", reply.viewer_session_id, reply.major, reply.minor, 2
)
elif type(reply) is _LttngLiveViewerGetTracingSessionInfosReply:
- data = self._pack('I', len(reply.tracing_session_infos))
+ data = self._pack("I", len(reply.tracing_session_infos))
for info in reply.tracing_session_infos:
data += self._pack(
- 'QIII',
+ "QIII",
info.tracing_session_id,
info.live_timer_freq,
info.client_count,
data += self._encode_zero_padded_str(info.hostname, 64)
data += self._encode_zero_padded_str(info.name, 255)
elif type(reply) is _LttngLiveViewerAttachToTracingSessionReply:
- data = self._pack('II', reply.status, len(reply.stream_infos))
+ data = self._pack("II", reply.status, len(reply.stream_infos))
for info in reply.stream_infos:
data += self._encode_stream_info(info)
elif type(reply) is _LttngLiveViewerGetNextDataStreamIndexEntryReply:
+ index_format = "QQQQQQQII"
entry = reply.index_entry
flags = self._get_has_new_stuff_flags(
reply.has_new_metadata, reply.has_new_data_stream
)
- data = self._pack(
- 'QQQQQQQII',
- entry.offset_bytes,
- entry.total_size_bits,
- entry.content_size_bits,
- entry.timestamp_begin,
- entry.timestamp_end,
- entry.events_discarded,
- entry.stream_class_id,
- reply.status,
- flags,
- )
+ if isinstance(entry, _LttngDataStreamIndexEntry):
+ data = self._pack(
+ index_format,
+ entry.offset_bytes,
+ entry.total_size_bits,
+ entry.content_size_bits,
+ entry.timestamp_begin,
+ entry.timestamp_end,
+ entry.events_discarded,
+ entry.stream_class_id,
+ reply.status,
+ flags,
+ )
+ else:
+ data = self._pack(
+ index_format,
+ 0,
+ 0,
+ 0,
+ 0,
+ entry.timestamp,
+ 0,
+ entry.stream_class_id,
+ reply.status,
+ flags,
+ )
elif type(reply) is _LttngLiveViewerGetDataStreamPacketDataReply:
flags = self._get_has_new_stuff_flags(
reply.has_new_metadata, reply.has_new_data_stream
)
- data = self._pack('III', reply.status, len(reply.data), flags)
+ data = self._pack("III", reply.status, len(reply.data), flags)
data += reply.data
elif type(reply) is _LttngLiveViewerGetMetadataStreamDataContentReply:
- data = self._pack('QI', len(reply.data), reply.status)
+ data = self._pack("QI", len(reply.data), reply.status)
data += reply.data
elif type(reply) is _LttngLiveViewerGetNewStreamInfosReply:
- data = self._pack('II', reply.status, len(reply.stream_infos))
+ data = self._pack("II", reply.status, len(reply.stream_infos))
for info in reply.stream_infos:
data += self._encode_stream_info(info)
elif type(reply) is _LttngLiveViewerCreateViewerSessionReply:
- data = self._pack('I', reply.status)
+ data = self._pack("I", reply.status)
elif type(reply) is _LttngLiveViewerDetachFromTracingSessionReply:
- data = self._pack('I', reply.status)
+ data = self._pack("I", reply.status)
else:
raise ValueError(
- 'Unknown reply object with class `{}`'.format(reply.__class__.__name__)
+ "Unknown reply object with class `{}`".format(reply.__class__.__name__)
)
return data
-# An entry within the index of an LTTng data stream.
-class _LttngDataStreamIndexEntry:
- def __init__(
- self,
- offset_bytes,
- total_size_bits,
- content_size_bits,
- timestamp_begin,
- timestamp_end,
- events_discarded,
- stream_class_id,
- ):
- self._offset_bytes = offset_bytes
- self._total_size_bits = total_size_bits
- self._content_size_bits = content_size_bits
- self._timestamp_begin = timestamp_begin
- self._timestamp_end = timestamp_end
- self._events_discarded = events_discarded
- self._stream_class_id = stream_class_id
-
- @property
- def offset_bytes(self):
- return self._offset_bytes
-
- @property
- def total_size_bits(self):
- return self._total_size_bits
-
- @property
- def total_size_bytes(self):
- return self._total_size_bits // 8
-
- @property
- def content_size_bits(self):
- return self._content_size_bits
+def _get_entry_timestamp_begin(
+ entry: _LttngIndexEntryT,
+):
+ if isinstance(entry, _LttngDataStreamBeaconIndexEntry):
+ return entry.timestamp
+ else:
+ return entry.timestamp_begin
- @property
- def content_size_bytes(self):
- return self._content_size_bits // 8
- @property
- def timestamp_begin(self):
- return self._timestamp_begin
-
- @property
- def timestamp_end(self):
- return self._timestamp_end
+# The index of an LTTng data stream, a sequence of index entries.
+class _LttngDataStreamIndex(Sequence[_LttngIndexEntryT]):
+ def __init__(self, path: str, beacons: Optional[tjson.ArrayVal]):
+ self._path = path
+ self._build()
- @property
- def events_discarded(self):
- return self._events_discarded
+ if beacons:
+ stream_class_id = self._entries[0].stream_class_id
- @property
- def stream_class_id(self):
- return self._stream_class_id
+ beacons_list = [] # type: list[_LttngDataStreamBeaconIndexEntry]
+ for ts in beacons.iter(tjson.IntVal):
+ beacons_list.append(
+ _LttngDataStreamBeaconIndexEntry(stream_class_id, ts.val)
+ )
+ self._add_beacons(beacons_list)
-# The index of an LTTng data stream, a sequence of index entries.
-class _LttngDataStreamIndex(collections.abc.Sequence):
- def __init__(self, path):
- self._path = path
- self._build()
logging.info(
'Built data stream index entries: path="{}", count={}'.format(
path, len(self._entries)
)
def _build(self):
- self._entries = []
+ self._entries = [] # type: list[_LttngIndexEntryT]
assert os.path.isfile(self._path)
- with open(self._path, 'rb') as f:
+ with open(self._path, "rb") as f:
# Read header first
- fmt = '>IIII'
+ fmt = ">IIII"
size = struct.calcsize(fmt)
data = f.read(size)
assert len(data) == size
- magic, index_major, index_minor, index_entry_length = struct.unpack(
- fmt, data
- )
+ magic, _, _, index_entry_length = struct.unpack(fmt, data)
assert magic == 0xC1F1DCC1
# Read index entries
- fmt = '>QQQQQQQ'
+ fmt = ">QQQQQQQ"
size = struct.calcsize(fmt)
while True:
break
assert len(data) == size
- offset_bytes, total_size_bits, content_size_bits, timestamp_begin, timestamp_end, events_discarded, stream_class_id = struct.unpack(
- fmt, data
- )
+ (
+ offset_bytes,
+ total_size_bits,
+ content_size_bits,
+ timestamp_begin,
+ timestamp_end,
+ events_discarded,
+ stream_class_id,
+ ) = struct.unpack(fmt, data)
self._entries.append(
_LttngDataStreamIndexEntry(
# Skip anything else before the next entry
f.seek(index_entry_length - size, os.SEEK_CUR)
- def __getitem__(self, index):
+ def _add_beacons(self, beacons: Iterable[_LttngDataStreamBeaconIndexEntry]):
+ # Assumes entries[n + 1].timestamp_end >= entries[n].timestamp_begin
+ def sort_key(
+ entry: Union[_LttngDataStreamIndexEntry, _LttngDataStreamBeaconIndexEntry],
+ ) -> int:
+ if isinstance(entry, _LttngDataStreamBeaconIndexEntry):
+ return entry.timestamp
+ else:
+ return entry.timestamp_end
+
+ self._entries += beacons
+ self._entries.sort(key=sort_key)
+
+ @overload
+ def __getitem__(self, index: int) -> _LttngIndexEntryT:
+ ...
+
+ @overload
+ def __getitem__(self, index: slice) -> Sequence[_LttngIndexEntryT]: # noqa: F811
+ ...
+
+ def __getitem__( # noqa: F811
+ self, index: Union[int, slice]
+ ) -> Union[_LttngIndexEntryT, Sequence[_LttngIndexEntryT],]:
return self._entries[index]
def __len__(self):
# An LTTng data stream.
class _LttngDataStream:
- def __init__(self, path):
+ def __init__(self, path: str, beacons_json: Optional[tjson.ArrayVal]):
self._path = path
filename = os.path.basename(path)
- match = re.match(r'(.*)_\d+', filename)
+ match = re.match(r"(.*)_\d+", filename)
+ if not match:
+ raise RuntimeError(
+ "Unexpected data stream file name pattern: {}".format(filename)
+ )
+
self._channel_name = match.group(1)
trace_dir = os.path.dirname(path)
- index_path = os.path.join(trace_dir, 'index', filename + '.idx')
- self._index = _LttngDataStreamIndex(index_path)
+ index_path = os.path.join(trace_dir, "index", filename + ".idx")
+ self._index = _LttngDataStreamIndex(index_path, beacons_json)
assert os.path.isfile(path)
- self._file = open(path, 'rb')
+ self._file = open(path, "rb")
logging.info(
'Built data stream: path="{}", channel-name="{}"'.format(
path, self._channel_name
def index(self):
return self._index
- def get_data(self, offset_bytes, len_bytes):
+ def get_data(self, offset_bytes: int, len_bytes: int):
self._file.seek(offset_bytes)
return self._file.read(len_bytes)
+class _LttngMetadataStreamSection:
+ def __init__(self, timestamp: int, data: Optional[bytes]):
+ self._timestamp = timestamp
+ if data is None:
+ self._data = bytes()
+ else:
+ self._data = data
+ logging.info(
+ "Built metadata stream section: ts={}, data-len={}".format(
+ self._timestamp, len(self._data)
+ )
+ )
+
+ @property
+ def timestamp(self):
+ return self._timestamp
+
+ @property
+ def data(self):
+ return self._data
+
+
# An LTTng metadata stream.
class _LttngMetadataStream:
- def __init__(self, path):
- self._path = path
- logging.info('Built metadata stream: path="{}"'.format(path))
+ def __init__(
+ self,
+ metadata_file_path: str,
+ config_sections: Sequence[_LttngMetadataStreamSection],
+ ):
+ self._path = metadata_file_path
+ self._sections = config_sections
+ logging.info(
+ "Built metadata stream: path={}, section-len={}".format(
+ self._path, len(self._sections)
+ )
+ )
@property
def path(self):
return self._path
@property
- def data(self):
- assert os.path.isfile(self._path)
+ def sections(self):
+ return self._sections
+
+
+class LttngMetadataConfigSection:
+ def __init__(self, line: int, timestamp: int, is_empty: bool):
+ self._line = line
+ self._timestamp = timestamp
+ self._is_empty = is_empty
+
+ @property
+ def line(self):
+ return self._line
+
+ @property
+ def timestamp(self):
+ return self._timestamp
+
+ @property
+ def is_empty(self):
+ return self._is_empty
+
+
+def _parse_metadata_sections_config(metadata_sections_json: tjson.ArrayVal):
+ metadata_sections = [] # type: list[LttngMetadataConfigSection]
+ append_empty_section = False
+ last_timestamp = 0
+ last_line = 0
+
+ for section in metadata_sections_json:
+ if isinstance(section, tjson.StrVal):
+ if section.val == "empty":
+ # Found a empty section marker. Actually append the section at the
+ # timestamp of the next concrete section.
+ append_empty_section = True
+ else:
+ raise ValueError("Invalid string value at {}.".format(section.path))
+ elif isinstance(section, tjson.ObjVal):
+ line = section.at("line", tjson.IntVal).val
+ ts = section.at("timestamp", tjson.IntVal).val
+
+ # Sections' timestamps and lines must both be increasing.
+ assert ts > last_timestamp
+ last_timestamp = ts
- with open(self._path, 'rb') as f:
- return f.read()
+ assert line > last_line
+ last_line = line
+
+ if append_empty_section:
+ metadata_sections.append(LttngMetadataConfigSection(line, ts, True))
+ append_empty_section = False
+
+ metadata_sections.append(LttngMetadataConfigSection(line, ts, False))
+ else:
+ raise TypeError(
+ "`{}`: expecting a string or object value".format(section.path)
+ )
+
+ return metadata_sections
+
+
+def _split_metadata_sections(
+ metadata_file_path: str, metadata_sections_json: tjson.ArrayVal
+):
+ metadata_sections = _parse_metadata_sections_config(metadata_sections_json)
+
+ sections = [] # type: list[_LttngMetadataStreamSection]
+ with open(metadata_file_path, "r") as metadata_file:
+ metadata_lines = [line for line in metadata_file]
+
+ metadata_section_idx = 0
+ curr_metadata_section = bytearray()
+
+ for idx, line_content in enumerate(metadata_lines):
+ # Add one to the index to convert from the zero-indexing of the
+ # enumerate() function to the one-indexing used by humans when
+ # viewing a text file.
+ curr_line_number = idx + 1
+
+ # If there are no more sections, simply append the line.
+ if metadata_section_idx + 1 >= len(metadata_sections):
+ curr_metadata_section += bytearray(line_content, "utf8")
+ continue
+
+ next_section_line_number = metadata_sections[metadata_section_idx + 1].line
+
+ # If the next section begins at the current line, create a
+ # section with the metadata we gathered so far.
+ if curr_line_number >= next_section_line_number:
+ # Flushing the metadata of the current section.
+ sections.append(
+ _LttngMetadataStreamSection(
+ metadata_sections[metadata_section_idx].timestamp,
+ bytes(curr_metadata_section),
+ )
+ )
+
+ # Move to the next section.
+ metadata_section_idx += 1
+
+ # Clear old content and append current line for the next section.
+ curr_metadata_section.clear()
+ curr_metadata_section += bytearray(line_content, "utf8")
+
+ # Append any empty sections.
+ while metadata_sections[metadata_section_idx].is_empty:
+ sections.append(
+ _LttngMetadataStreamSection(
+ metadata_sections[metadata_section_idx].timestamp, None
+ )
+ )
+ metadata_section_idx += 1
+ else:
+ # Append line_content to the current metadata section.
+ curr_metadata_section += bytearray(line_content, "utf8")
+
+ # We iterated over all the lines of the metadata file. Close the current section.
+ sections.append(
+ _LttngMetadataStreamSection(
+ metadata_sections[metadata_section_idx].timestamp,
+ bytes(curr_metadata_section),
+ )
+ )
+
+ return sections
+
+
+_StreamBeaconsT = Dict[str, Iterable[int]]
# An LTTng trace, a sequence of LTTng data streams.
-class LttngTrace(collections.abc.Sequence):
- def __init__(self, trace_dir):
+class LttngTrace(Sequence[_LttngDataStream]):
+ def __init__(
+ self,
+ trace_dir: str,
+ metadata_sections_json: Optional[tjson.ArrayVal],
+ beacons_json: Optional[tjson.ObjVal],
+ ):
assert os.path.isdir(trace_dir)
self._path = trace_dir
- self._metadata_stream = _LttngMetadataStream(
- os.path.join(trace_dir, 'metadata')
- )
- self._create_data_streams(trace_dir)
+ self._create_metadata_stream(trace_dir, metadata_sections_json)
+ self._create_data_streams(trace_dir, beacons_json)
logging.info('Built trace: path="{}"'.format(trace_dir))
- def _create_data_streams(self, trace_dir):
- data_stream_paths = []
+ def _create_data_streams(
+ self, trace_dir: str, beacons_json: Optional[tjson.ObjVal]
+ ):
+ data_stream_paths = [] # type: list[str]
for filename in os.listdir(trace_dir):
path = os.path.join(trace_dir, filename)
if not os.path.isfile(path):
continue
- if filename.startswith('.'):
+ if filename.startswith("."):
continue
- if filename == 'metadata':
+ if filename == "metadata":
continue
data_stream_paths.append(path)
data_stream_paths.sort()
- self._data_streams = []
+ self._data_streams = [] # type: list[_LttngDataStream]
for data_stream_path in data_stream_paths:
- self._data_streams.append(_LttngDataStream(data_stream_path))
+ stream_name = os.path.basename(data_stream_path)
+ this_beacons_json = None
+ if beacons_json is not None and stream_name in beacons_json:
+ this_beacons_json = beacons_json.at(stream_name, tjson.ArrayVal)
+
+ self._data_streams.append(
+ _LttngDataStream(data_stream_path, this_beacons_json)
+ )
+
+ def _create_metadata_stream(
+ self, trace_dir: str, metadata_sections_json: Optional[tjson.ArrayVal]
+ ):
+ metadata_path = os.path.join(trace_dir, "metadata")
+ metadata_sections = [] # type: list[_LttngMetadataStreamSection]
+
+ if metadata_sections_json is None:
+ with open(metadata_path, "rb") as metadata_file:
+ metadata_sections.append(
+ _LttngMetadataStreamSection(0, metadata_file.read())
+ )
+ else:
+ metadata_sections = _split_metadata_sections(
+ metadata_path, metadata_sections_json
+ )
+
+ self._metadata_stream = _LttngMetadataStream(metadata_path, metadata_sections)
@property
def path(self):
def metadata_stream(self):
return self._metadata_stream
- def __getitem__(self, index):
+ @overload
+ def __getitem__(self, index: int) -> _LttngDataStream:
+ ...
+
+ @overload
+ def __getitem__(self, index: slice) -> Sequence[_LttngDataStream]: # noqa: F811
+ ...
+
+ def __getitem__( # noqa: F811
+ self, index: Union[int, slice]
+ ) -> Union[_LttngDataStream, Sequence[_LttngDataStream]]:
return self._data_streams[index]
def __len__(self):
# The state of a single data stream.
class _LttngLiveViewerSessionDataStreamState:
- def __init__(self, ts_state, info, data_stream):
+ def __init__(
+ self,
+ ts_state: "_LttngLiveViewerSessionTracingSessionState",
+ info: _LttngLiveViewerStreamInfo,
+ data_stream: _LttngDataStream,
+ metadata_stream_id: int,
+ ):
self._ts_state = ts_state
self._info = info
self._data_stream = data_stream
+ self._metadata_stream_id = metadata_stream_id
self._cur_index_entry_index = 0
fmt = 'Built data stream state: id={}, ts-id={}, ts-name="{}", path="{}"'
logging.info(
return self._data_stream.index[self._cur_index_entry_index]
+ @property
+ def metadata_stream_id(self):
+ return self._metadata_stream_id
+
def goto_next_index_entry(self):
self._cur_index_entry_index += 1
# The state of a single metadata stream.
class _LttngLiveViewerSessionMetadataStreamState:
- def __init__(self, ts_state, info, metadata_stream):
+ def __init__(
+ self,
+ ts_state: "_LttngLiveViewerSessionTracingSessionState",
+ info: _LttngLiveViewerStreamInfo,
+ metadata_stream: _LttngMetadataStream,
+ ):
self._ts_state = ts_state
self._info = info
self._metadata_stream = metadata_stream
+ self._cur_metadata_stream_section_index = 0
+ if len(metadata_stream.sections) > 1:
+ self._next_metadata_stream_section_timestamp = metadata_stream.sections[
+ 1
+ ].timestamp
+ else:
+ self._next_metadata_stream_section_timestamp = None
+
self._is_sent = False
fmt = 'Built metadata stream state: id={}, ts-id={}, ts-name="{}", path="{}"'
logging.info(
)
)
- @property
- def trace_session_state(self):
- return self._trace_session_state
-
@property
def info(self):
return self._info
return self._is_sent
@is_sent.setter
- def is_sent(self, value):
+ def is_sent(self, value: bool):
self._is_sent = value
+ @property
+ def cur_section(self):
+ fmt = "Get current metadata section: section-idx={}"
+ logging.info(fmt.format(self._cur_metadata_stream_section_index))
+ if self._cur_metadata_stream_section_index == len(
+ self._metadata_stream.sections
+ ):
+ return
+
+ return self._metadata_stream.sections[self._cur_metadata_stream_section_index]
+
+ def goto_next_section(self):
+ self._cur_metadata_stream_section_index += 1
+ if self.cur_section:
+ self._next_metadata_stream_section_timestamp = self.cur_section.timestamp
+ else:
+ self._next_metadata_stream_section_timestamp = None
+
+ @property
+ def next_section_timestamp(self):
+ return self._next_metadata_stream_section_timestamp
+
+
+# A tracing session descriptor.
+#
+# In the constructor, `traces` is a list of LTTng traces (`LttngTrace`
+# objects).
+class LttngTracingSessionDescriptor:
+ def __init__(
+ self,
+ name: str,
+ tracing_session_id: int,
+ hostname: str,
+ live_timer_freq: int,
+ client_count: int,
+ traces: Iterable[LttngTrace],
+ ):
+ for trace in traces:
+ if name not in trace.path:
+ fmt = "Tracing session name must be part of every trace path (`{}` not found in `{}`)"
+ raise ValueError(fmt.format(name, trace.path))
+
+ self._traces = traces
+ stream_count = sum([len(t) + 1 for t in traces])
+ self._info = _LttngLiveViewerTracingSessionInfo(
+ tracing_session_id,
+ live_timer_freq,
+ client_count,
+ stream_count,
+ hostname,
+ name,
+ )
+
+ @property
+ def traces(self):
+ return self._traces
+
+ @property
+ def info(self):
+ return self._info
+
# The state of a tracing session.
class _LttngLiveViewerSessionTracingSessionState:
- def __init__(self, tc_descr, base_stream_id):
+ def __init__(self, tc_descr: LttngTracingSessionDescriptor, base_stream_id: int):
self._tc_descr = tc_descr
- self._stream_infos = []
- self._ds_states = {}
- self._ms_states = {}
+ self._stream_infos = [] # type: list[_LttngLiveViewerStreamInfo]
+ self._ds_states = {} # type: dict[int, _LttngLiveViewerSessionDataStreamState]
+ self._ms_states = (
+ {}
+ ) # type: dict[int, _LttngLiveViewerSessionMetadataStreamState]
stream_id = base_stream_id
for trace in tc_descr.traces:
trace_id = stream_id * 1000
+ # Metadata stream -> stream info and metadata stream state
+ info = _LttngLiveViewerStreamInfo(
+ stream_id, trace_id, True, trace.metadata_stream.path, "metadata"
+ )
+ self._stream_infos.append(info)
+ self._ms_states[stream_id] = _LttngLiveViewerSessionMetadataStreamState(
+ self, info, trace.metadata_stream
+ )
+ metadata_stream_id = stream_id
+ stream_id += 1
+
# Data streams -> stream infos and data stream states
for data_stream in trace:
info = _LttngLiveViewerStreamInfo(
)
self._stream_infos.append(info)
self._ds_states[stream_id] = _LttngLiveViewerSessionDataStreamState(
- self, info, data_stream
+ self, info, data_stream, metadata_stream_id
)
stream_id += 1
- # Metadata stream -> stream info and metadata stream state
- info = _LttngLiveViewerStreamInfo(
- stream_id, trace_id, True, trace.metadata_stream.path, 'metadata'
- )
- self._stream_infos.append(info)
- self._ms_states[stream_id] = _LttngLiveViewerSessionMetadataStreamState(
- self, info, trace.metadata_stream
- )
- stream_id += 1
-
self._is_attached = False
fmt = 'Built tracing session state: id={}, name="{}"'
logging.info(fmt.format(tc_descr.info.tracing_session_id, tc_descr.info.name))
return self._is_attached
@is_attached.setter
- def is_attached(self, value):
+ def is_attached(self, value: bool):
self._is_attached = value
+def needs_new_metadata_section(
+ metadata_stream_state: _LttngLiveViewerSessionMetadataStreamState,
+ latest_timestamp: int,
+):
+ if metadata_stream_state.next_section_timestamp is None:
+ return False
+
+ if latest_timestamp >= metadata_stream_state.next_section_timestamp:
+ return True
+ else:
+ return False
+
+
# An LTTng live viewer session manages a view on tracing sessions
# and replies to commands accordingly.
class _LttngLiveViewerSession:
def __init__(
self,
- viewer_session_id,
- tracing_session_descriptors,
- max_query_data_response_size,
+ viewer_session_id: int,
+ tracing_session_descriptors: Iterable[LttngTracingSessionDescriptor],
+ max_query_data_response_size: Optional[int],
):
self._viewer_session_id = viewer_session_id
- self._ts_states = {}
- self._stream_states = {}
+ self._ts_states = (
+ {}
+ ) # type: dict[int, _LttngLiveViewerSessionTracingSessionState]
+ self._stream_states = (
+ {}
+ ) # type: dict[int, _LttngLiveViewerSessionDataStreamState | _LttngLiveViewerSessionMetadataStreamState]
self._max_query_data_response_size = max_query_data_response_size
total_stream_infos = 0
_LttngLiveViewerGetNewStreamInfosCommand: self._handle_get_new_stream_infos_command,
_LttngLiveViewerGetNextDataStreamIndexEntryCommand: self._handle_get_next_data_stream_index_entry_command,
_LttngLiveViewerGetTracingSessionInfosCommand: self._handle_get_tracing_session_infos_command,
- }
+ } # type: dict[type[_LttngLiveViewerCommand], Callable[[Any], _LttngLiveViewerReply]]
@property
def viewer_session_id(self):
return self._viewer_session_id
- def _get_tracing_session_state(self, tracing_session_id):
+ def _get_tracing_session_state(self, tracing_session_id: int):
if tracing_session_id not in self._ts_states:
raise UnexpectedInput(
- 'Unknown tracing session ID {}'.format(tracing_session_id)
+ "Unknown tracing session ID {}".format(tracing_session_id)
)
return self._ts_states[tracing_session_id]
- def _get_stream_state(self, stream_id):
+ def _get_data_stream_state(self, stream_id: int):
+ if stream_id not in self._stream_states:
+ RuntimeError("Unknown stream ID {}".format(stream_id))
+
+ stream = self._stream_states[stream_id]
+ if type(stream) is not _LttngLiveViewerSessionDataStreamState:
+ raise RuntimeError("Stream is not a data stream")
+
+ return stream
+
+ def _get_metadata_stream_state(self, stream_id: int):
if stream_id not in self._stream_states:
- UnexpectedInput('Unknown stream ID {}'.format(stream_id))
+ RuntimeError("Unknown stream ID {}".format(stream_id))
- return self._stream_states[stream_id]
+ stream = self._stream_states[stream_id]
+ if type(stream) is not _LttngLiveViewerSessionMetadataStreamState:
+ raise RuntimeError("Stream is not a metadata stream")
- def handle_command(self, cmd):
+ return stream
+
+ def handle_command(self, cmd: _LttngLiveViewerCommand):
logging.info(
- 'Handling command in viewer session: cmd-cls-name={}'.format(
+ "Handling command in viewer session: cmd-cls-name={}".format(
cmd.__class__.__name__
)
)
if cmd_type not in self._command_handlers:
raise UnexpectedInput(
- 'Unexpected command: cmd-cls-name={}'.format(cmd.__class__.__name__)
+ "Unexpected command: cmd-cls-name={}".format(cmd.__class__.__name__)
)
return self._command_handlers[cmd_type](cmd)
- def _handle_attach_to_tracing_session_command(self, cmd):
+ def _handle_attach_to_tracing_session_command(
+ self, cmd: _LttngLiveViewerAttachToTracingSessionCommand
+ ):
fmt = 'Handling "attach to tracing session" command: ts-id={}, offset={}, seek-type={}'
logging.info(fmt.format(cmd.tracing_session_id, cmd.offset, cmd.seek_type))
ts_state = self._get_tracing_session_state(cmd.tracing_session_id)
if ts_state.is_attached:
raise UnexpectedInput(
- 'Cannot attach to tracing session `{}`: viewer is already attached'.format(
+ "Cannot attach to tracing session `{}`: viewer is already attached".format(
info.name
)
)
status, ts_state.stream_infos
)
- def _handle_detach_from_tracing_session_command(self, cmd):
+ def _handle_detach_from_tracing_session_command(
+ self, cmd: _LttngLiveViewerDetachFromTracingSessionCommand
+ ):
fmt = 'Handling "detach from tracing session" command: ts-id={}'
logging.info(fmt.format(cmd.tracing_session_id))
ts_state = self._get_tracing_session_state(cmd.tracing_session_id)
if not ts_state.is_attached:
raise UnexpectedInput(
- 'Cannot detach to tracing session `{}`: viewer is not attached'.format(
+ "Cannot detach to tracing session `{}`: viewer is not attached".format(
info.name
)
)
status = _LttngLiveViewerDetachFromTracingSessionReply.Status.OK
return _LttngLiveViewerDetachFromTracingSessionReply(status)
- def _handle_get_next_data_stream_index_entry_command(self, cmd):
+ def _handle_get_next_data_stream_index_entry_command(
+ self, cmd: _LttngLiveViewerGetNextDataStreamIndexEntryCommand
+ ):
fmt = 'Handling "get next data stream index entry" command: stream-id={}'
logging.info(fmt.format(cmd.stream_id))
- stream_state = self._get_stream_state(cmd.stream_id)
-
- if type(stream_state) is not _LttngLiveViewerSessionDataStreamState:
- raise UnexpectedInput(
- 'Stream with ID {} is not a data stream'.format(cmd.stream_id)
- )
+ stream_state = self._get_data_stream_state(cmd.stream_id)
+ metadata_stream_state = self._get_metadata_stream_state(
+ stream_state.metadata_stream_id
+ )
if stream_state.cur_index_entry is None:
# The viewer is done reading this stream
status, index_entry, False, False
)
+ timestamp_begin = _get_entry_timestamp_begin(stream_state.cur_index_entry)
+
+ if needs_new_metadata_section(metadata_stream_state, timestamp_begin):
+ metadata_stream_state.is_sent = False
+ metadata_stream_state.goto_next_section()
+
# The viewer only checks the `has_new_metadata` flag if the
# reply's status is `OK`, so we need to provide an index here
has_new_metadata = stream_state.tracing_session_state.has_new_metadata
- status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.OK
+ if isinstance(stream_state.cur_index_entry, _LttngDataStreamIndexEntry):
+ status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.OK
+ else:
+ status = _LttngLiveViewerGetNextDataStreamIndexEntryReply.Status.INACTIVE
+
reply = _LttngLiveViewerGetNextDataStreamIndexEntryReply(
status, stream_state.cur_index_entry, has_new_metadata, False
)
stream_state.goto_next_index_entry()
return reply
- def _handle_get_data_stream_packet_data_command(self, cmd):
+ def _handle_get_data_stream_packet_data_command(
+ self, cmd: _LttngLiveViewerGetDataStreamPacketDataCommand
+ ):
fmt = 'Handling "get data stream packet data" command: stream-id={}, offset={}, req-length={}'
logging.info(fmt.format(cmd.stream_id, cmd.offset, cmd.req_length))
- stream_state = self._get_stream_state(cmd.stream_id)
+ stream_state = self._get_data_stream_state(cmd.stream_id)
data_response_length = cmd.req_length
- if type(stream_state) is not _LttngLiveViewerSessionDataStreamState:
- raise UnexpectedInput(
- 'Stream with ID {} is not a data stream'.format(cmd.stream_id)
- )
-
if stream_state.tracing_session_state.has_new_metadata:
status = _LttngLiveViewerGetDataStreamPacketDataReply.Status.ERROR
return _LttngLiveViewerGetDataStreamPacketDataReply(
status = _LttngLiveViewerGetDataStreamPacketDataReply.Status.OK
return _LttngLiveViewerGetDataStreamPacketDataReply(status, data, False, False)
- def _handle_get_metadata_stream_data_command(self, cmd):
+ def _handle_get_metadata_stream_data_command(
+ self, cmd: _LttngLiveViewerGetMetadataStreamDataCommand
+ ):
fmt = 'Handling "get metadata stream data" command: stream-id={}'
logging.info(fmt.format(cmd.stream_id))
- stream_state = self._get_stream_state(cmd.stream_id)
-
- if type(stream_state) is not _LttngLiveViewerSessionMetadataStreamState:
- raise UnexpectedInput(
- 'Stream with ID {} is not a metadata stream'.format(cmd.stream_id)
- )
+ metadata_stream_state = self._get_metadata_stream_state(cmd.stream_id)
- if stream_state.is_sent:
+ if metadata_stream_state.is_sent:
status = _LttngLiveViewerGetMetadataStreamDataContentReply.Status.NO_NEW
return _LttngLiveViewerGetMetadataStreamDataContentReply(status, bytes())
- stream_state.is_sent = True
+ metadata_stream_state.is_sent = True
status = _LttngLiveViewerGetMetadataStreamDataContentReply.Status.OK
+ metadata_section = metadata_stream_state.cur_section
+ assert metadata_section is not None
+
+ # If we are sending an empty section, ready the next one right away.
+ if len(metadata_section.data) == 0:
+ metadata_stream_state.is_sent = False
+ metadata_stream_state.goto_next_section()
+
+ fmt = 'Replying to "get metadata stream data" command: metadata-size={}'
+ logging.info(fmt.format(len(metadata_section.data)))
return _LttngLiveViewerGetMetadataStreamDataContentReply(
- status, stream_state.metadata_stream.data
+ status, metadata_section.data
)
- def _handle_get_new_stream_infos_command(self, cmd):
+ def _handle_get_new_stream_infos_command(
+ self, cmd: _LttngLiveViewerGetNewStreamInfosCommand
+ ):
fmt = 'Handling "get new stream infos" command: ts-id={}'
logging.info(fmt.format(cmd.tracing_session_id))
status = _LttngLiveViewerGetNewStreamInfosReply.Status.HUP
return _LttngLiveViewerGetNewStreamInfosReply(status, [])
- def _handle_get_tracing_session_infos_command(self, cmd):
+ def _handle_get_tracing_session_infos_command(
+ self, cmd: _LttngLiveViewerGetTracingSessionInfosCommand
+ ):
logging.info('Handling "get tracing session infos" command.')
infos = [
tss.tracing_session_descriptor.info for tss in self._ts_states.values()
infos.sort(key=lambda info: info.name)
return _LttngLiveViewerGetTracingSessionInfosReply(infos)
- def _handle_create_viewer_session_command(self, cmd):
+ def _handle_create_viewer_session_command(
+ self, cmd: _LttngLiveViewerCreateViewerSessionCommand
+ ):
logging.info('Handling "create viewer session" command.')
status = _LttngLiveViewerCreateViewerSessionReply.Status.OK
# An LTTng live TCP server.
#
-# On creation, it binds to `localhost` with an OS-assigned TCP port. It writes
-# the decimal TCP port number to a temporary port file. It renames the
-# temporary port file to `port_filename`.
+# On creation, it binds to `localhost` on the TCP port `port` if not `None`, or
+# on an OS-assigned TCP port otherwise. It writes the decimal TCP port number
+# to a temporary port file. It renames the temporary port file to
+# `port_filename`.
#
# `tracing_session_descriptors` is a list of tracing session descriptors
# (`LttngTracingSessionDescriptor`) to serve.
# returns.
class LttngLiveServer:
def __init__(
- self, port_filename, tracing_session_descriptors, max_query_data_response_size
+ self,
+ port: Optional[int],
+ port_filename: str,
+ tracing_session_descriptors: Iterable[LttngTracingSessionDescriptor],
+ max_query_data_response_size: Optional[int],
):
- logging.info('Server configuration:')
+ logging.info("Server configuration:")
- logging.info(' Port file name: `{}`'.format(port_filename))
+ logging.info(" Port file name: `{}`".format(port_filename))
if max_query_data_response_size is not None:
logging.info(
- ' Maximum response data query size: `{}`'.format(
+ " Maximum response data query size: `{}`".format(
max_query_data_response_size
)
)
self._codec = _LttngLiveViewerProtocolCodec()
# Port 0: OS assigns an unused port
- serv_addr = ('localhost', 0)
+ serv_addr = ("localhost", port if port is not None else 0)
self._sock.bind(serv_addr)
self._write_port_to_file(port_filename)
self._listen()
finally:
self._sock.close()
- logging.info('Closed connection and socket.')
+ logging.info("Closed connection and socket.")
@property
def _server_port(self):
data = bytes()
while True:
- logging.info('Waiting for viewer command.')
+ logging.info("Waiting for viewer command.")
buf = self._conn.recv(128)
if not buf:
- logging.info('Client closed connection.')
+ logging.info("Client closed connection.")
if data:
raise UnexpectedInput(
- 'Client closed connection after having sent {} command bytes.'.format(
+ "Client closed connection after having sent {} command bytes.".format(
len(data)
)
)
return
- logging.info('Received data from viewer: length={}'.format(len(buf)))
+ logging.info("Received data from viewer: length={}".format(len(buf)))
data += buf
try:
cmd = self._codec.decode(data)
except struct.error as exc:
- raise UnexpectedInput('Malformed command: {}'.format(exc)) from exc
+ raise UnexpectedInput("Malformed command: {}".format(exc)) from exc
if cmd is not None:
logging.info(
- 'Received command from viewer: cmd-cls-name={}'.format(
+ "Received command from viewer: cmd-cls-name={}".format(
cmd.__class__.__name__
)
)
return cmd
- def _send_reply(self, reply):
+ def _send_reply(self, reply: _LttngLiveViewerReply):
data = self._codec.encode(reply)
logging.info(
- 'Sending reply to viewer: reply-cls-name={}, length={}'.format(
+ "Sending reply to viewer: reply-cls-name={}, length={}".format(
reply.__class__.__name__, len(data)
)
)
# Create viewer session (arbitrary ID 23)
logging.info(
- 'LTTng live viewer connected: version={}.{}'.format(cmd.major, cmd.minor)
+ "LTTng live viewer connected: version={}.{}".format(cmd.major, cmd.minor)
)
viewer_session = _LttngLiveViewerSession(
23, self._ts_descriptors, self._max_query_data_response_size
self._send_reply(viewer_session.handle_command(cmd))
def _listen(self):
- logging.info('Listening: port={}'.format(self._server_port))
- self._sock.listen()
+ logging.info("Listening: port={}".format(self._server_port))
+ # Backlog must be present for Python version < 3.5.
+ # 128 is an arbitrary number since we expect only 1 connection anyway.
+ self._sock.listen(128)
self._conn, viewer_addr = self._sock.accept()
logging.info(
- 'Accepted viewer: addr={}:{}'.format(viewer_addr[0], viewer_addr[1])
+ "Accepted viewer: addr={}:{}".format(viewer_addr[0], viewer_addr[1])
)
try:
finally:
self._conn.close()
- def _write_port_to_file(self, port_filename):
+ def _write_port_to_file(self, port_filename: str):
# Write the port number to a temporary file.
- with tempfile.NamedTemporaryFile(mode='w', delete=False) as tmp_port_file:
- print(self._server_port, end='', file=tmp_port_file)
+ with tempfile.NamedTemporaryFile(mode="w", delete=False) as tmp_port_file:
+ print(self._server_port, end="", file=tmp_port_file)
# Rename temporary file to real file
- os.rename(tmp_port_file.name, port_filename)
+ os.replace(tmp_port_file.name, port_filename)
logging.info(
'Renamed port file: src-path="{}", dst-path="{}"'.format(
tmp_port_file.name, port_filename
)
-# A tracing session descriptor.
-#
-# In the constructor, `traces` is a list of LTTng traces (`LttngTrace`
-# objects).
-class LttngTracingSessionDescriptor:
- def __init__(
- self, name, tracing_session_id, hostname, live_timer_freq, client_count, traces
- ):
- for trace in traces:
- if name not in trace.path:
- fmt = 'Tracing session name must be part of every trace path (`{}` not found in `{}`)'
- raise ValueError(fmt.format(name, trace.path))
-
- self._traces = traces
- stream_count = sum([len(t) + 1 for t in traces])
- self._info = _LttngLiveViewerTracingSessionInfo(
- tracing_session_id,
- live_timer_freq,
- client_count,
- stream_count,
- hostname,
- name,
- )
+def _session_descriptors_from_path(
+ sessions_filename: str, trace_path_prefix: Optional[str]
+):
+ # File format is:
+ #
+ # [
+ # {
+ # "name": "my-session",
+ # "id": 17,
+ # "hostname": "myhost",
+ # "live-timer-freq": 1000000,
+ # "client-count": 23,
+ # "traces": [
+ # {
+ # "path": "lol"
+ # },
+ # {
+ # "path": "meow/mix",
+ # "beacons": {
+ # "my_stream": [ 5235787, 728375283 ]
+ # },
+ # "metadata-sections": [
+ # {
+ # "line": 1,
+ # "timestamp": 0
+ # }
+ # ]
+ # }
+ # ]
+ # }
+ # ]
+ with open(sessions_filename, "r") as sessions_file:
+ sessions_json = tjson.load(sessions_file, tjson.ArrayVal)
+
+ sessions = [] # type: list[LttngTracingSessionDescriptor]
+
+ for session_json in sessions_json.iter(tjson.ObjVal):
+ name = session_json.at("name", tjson.StrVal).val
+ tracing_session_id = session_json.at("id", tjson.IntVal).val
+ hostname = session_json.at("hostname", tjson.StrVal).val
+ live_timer_freq = session_json.at("live-timer-freq", tjson.IntVal).val
+ client_count = session_json.at("client-count", tjson.IntVal).val
+ traces_json = session_json.at("traces", tjson.ArrayVal)
+
+ traces = [] # type: list[LttngTrace]
+
+ for trace_json in traces_json.iter(tjson.ObjVal):
+ metadata_sections = (
+ trace_json.at("metadata-sections", tjson.ArrayVal)
+ if "metadata-sections" in trace_json
+ else None
+ )
+ beacons = (
+ trace_json.at("beacons", tjson.ObjVal)
+ if "beacons" in trace_json
+ else None
+ )
+ path = trace_json.at("path", tjson.StrVal).val
- @property
- def traces(self):
- return self._traces
+ if not os.path.isabs(path) and trace_path_prefix:
+ path = os.path.join(trace_path_prefix, path)
- @property
- def info(self):
- return self._info
+ traces.append(
+ LttngTrace(
+ path,
+ metadata_sections,
+ beacons,
+ )
+ )
+ sessions.append(
+ LttngTracingSessionDescriptor(
+ name,
+ tracing_session_id,
+ hostname,
+ live_timer_freq,
+ client_count,
+ traces,
+ )
+ )
-def _tracing_session_descriptors_from_arg(string):
- # Format is:
- # NAME,ID,HOSTNAME,FREQ,CLIENTS,TRACEPATH[,TRACEPATH]...
- parts = string.split(',')
- name = parts[0]
- tracing_session_id = int(parts[1])
- hostname = parts[2]
- live_timer_freq = int(parts[3])
- client_count = int(parts[4])
- traces = [LttngTrace(path) for path in parts[5:]]
- return LttngTracingSessionDescriptor(
- name, tracing_session_id, hostname, live_timer_freq, client_count, traces
- )
+ return sessions
-def _loglevel_parser(string):
- loglevels = {'info': logging.INFO, 'warning': logging.WARNING}
+def _loglevel_parser(string: str):
+ loglevels = {"info": logging.INFO, "warning": logging.WARNING}
if string not in loglevels:
msg = "{} is not a valid loglevel".format(string)
raise argparse.ArgumentTypeError(msg)
return loglevels[string]
-if __name__ == '__main__':
- logging.basicConfig(format='# %(asctime)-25s%(message)s')
+if __name__ == "__main__":
+ logging.basicConfig(format="# %(asctime)-25s%(message)s")
parser = argparse.ArgumentParser(
- description='LTTng-live protocol mocker', add_help=False
+ description="LTTng-live protocol mocker", add_help=False
)
parser.add_argument(
- '--log-level',
- default='warning',
- choices=['info', 'warning'],
- help='The loglevel to be used.',
+ "--log-level",
+ default="warning",
+ choices=["info", "warning"],
+ help="The loglevel to be used.",
)
loglevel_namespace, remaining_args = parser.parse_known_args()
logging.getLogger().setLevel(_loglevel_parser(loglevel_namespace.log_level))
parser.add_argument(
- '--port-filename',
- help='The final port file. This file is present when the server is ready to receive connection.',
+ "--port",
+ help="The port to bind to. If missing, use an OS-assigned port..",
+ type=int,
+ )
+ parser.add_argument(
+ "--port-filename",
+ help="The final port file. This file is present when the server is ready to receive connection.",
required=True,
)
parser.add_argument(
- '--max-query-data-response-size',
+ "--max-query-data-response-size",
type=int,
- help='The maximum size of control data response in bytes',
+ help="The maximum size of control data response in bytes",
)
parser.add_argument(
- 'sessions',
- nargs="+",
- metavar="SESSION",
- type=_tracing_session_descriptors_from_arg,
- help='A session configuration. There is no space after comma. Format is: NAME,ID,HOSTNAME,FREQ,CLIENTS,TRACEPATH[,TRACEPATH]....',
+ "--trace-path-prefix",
+ type=str,
+ help="Prefix to prepend to the trace paths of session configurations",
)
parser.add_argument(
- '-h',
- '--help',
- action='help',
+ "--sessions-filename",
+ type=str,
+ help="Path to a session configuration file",
+ )
+ parser.add_argument(
+ "-h",
+ "--help",
+ action="help",
default=argparse.SUPPRESS,
- help='Show this help message and exit.',
+ help="Show this help message and exit.",
)
args = parser.parse_args(args=remaining_args)
try:
- LttngLiveServer(
- args.port_filename, args.sessions, args.max_query_data_response_size
+ sessions_filename = args.sessions_filename # type: str
+ trace_path_prefix = args.trace_path_prefix # type: str | None
+ sessions = _session_descriptors_from_path(
+ sessions_filename,
+ trace_path_prefix,
)
+
+ port = args.port # type: int | None
+ port_filename = args.port_filename # type: str
+ max_query_data_response_size = (
+ args.max_query_data_response_size
+ ) # type: int | None
+ LttngLiveServer(port, port_filename, sessions, max_query_data_response_size)
except UnexpectedInput as exc:
logging.error(str(exc))
print(exc, file=sys.stderr)
projects / babeltrace.git / blobdiff