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First release of the new jeb core library

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Jakob Scheid
2026-03-09 22:17:33 +01:00
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NOTICE
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jCloud Third-Party Notices
===========================
This software uses the following third-party libraries. Full license texts are available in the 'licenses/' directory.
1. config-parser 1.2.1
Author: jCloud Services GbR
License: Apache License 2.0
See licenses/config-parser.txt for full license text.
2. jeb-utils 0.1.4
Author: jCloud Services GbR
License: Apache License 2.0
See licenses/jeb-utils.txt for full license text.
3. cffi 2.0.0
Author: Armin Rigo, Maciej Fijalkowski
License: MIT License
See licenses/cffi.txt for full license text.
4. cryptography 46.0.5
Author: Python Cryptographic Authority
License: Apache License 2.0 or BSD 3-Clause License
URL: https://cryptography.io/
See licenses/cryptography.APACHE.txt or licenses/cryptography.BSD.txt for full license text.
5. pycparser 3.0
Author: Eli Bendersky
License: BSD 3-Clause License
See licenses/pycparser.txt for full license text.
README.md
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# jeb-core
The core for jeb
## Installation
You can install the library using `pip`:
```bash
pip install jeb-core --index-url https://repo.jcloud-services.ddns.net/simple/ --extra-index-url https://pypi.org/simple
```
## Usage
### `JEBCore`
The main class. It has following methods:
- `get_segment_base_timestamp`: Returns the base timestamp of a segment.
- `get_topics`: Returns all topics.
- `mktopic`: Creates a topic.
- `rmtopic`: Removes a topic.
- `mktopicpart`: Creates a partition of a topic.
- `rmtopicpart`: Removes a partition of a topic.
- `check_topic_exists`: Checks whether a topic exists (raises an exception if not).
- `create_record`: Creates a record.
- `fetch_records`: Fetches records from the topic and yields them in chunks.
### `Topic`
A topic.
### `Segment`:
A segment.
For more details, see the function and method docstrings.
## Changelog
### Version 0.1.0
- First release of the new jeb core library
deploy.sh
Executable
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#!/usr/bin/bash
# Copyright 2026 jCloud Services GbR
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
python3 -m build
scp dist/* jcloud@jcloud-services.ddns.net:/srv/data/wwwstatic/repo/simple/jeb-core/
licenses/cffi.txt
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Except when otherwise stated (look for LICENSE files in directories or
information at the beginning of each file) all software and
documentation is licensed as follows:
MIT No Attribution
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.
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.
licenses/config-parser.txt
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Copyright 2026 jCloud Services GbR
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
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"Contributor" shall mean Licensor and any individual or Legal Entity
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or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
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meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
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do not modify the License. You may add Your own attribution
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or as an addendum to the NOTICE text from the Work, provided
that such additional attribution notices cannot be construed
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You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
for use, reproduction, or distribution of Your modifications, or
for any such Derivative Works as a whole, provided Your use,
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any Contribution intentionally submitted for inclusion in the Work
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6. Trademarks. This License does not grant permission to use the trade
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Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
PARTICULAR PURPOSE. You are solely responsible for determining the
appropriateness of using or redistributing the Work and assume any
risks associated with Your exercise of permissions under this License.
8. Limitation of Liability. In no event and under no legal theory,
whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
liable to You for damages, including any direct, indirect, special,
incidental, or consequential damages of any character arising as a
result of this License or out of the use or inability to use the
Work (including but not limited to damages for loss of goodwill,
work stoppage, computer failure or malfunction, or any and all
other commercial damages or losses), even if such Contributor
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the Work or Derivative Works thereof, You may choose to offer,
and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
END OF TERMS AND CONDITIONS
APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
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you may not use this file except in compliance with the License.
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licenses/cryptography.APACHE.txt
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Apache License
Version 2.0, January 2004
https://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
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institute patent litigation against any entity (including a
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granted to You under this License for that Work shall terminate
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stating that You changed the files; and
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of the NOTICE file are for informational purposes only and
do not modify the License. You may add Your own attribution
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You may add Your own copyright statement to Your modifications and
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for use, reproduction, or distribution of Your modifications, or
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this License, without any additional terms or conditions.
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the terms of any separate license agreement you may have executed
with Licensor regarding such Contributions.
6. Trademarks. This License does not grant permission to use the trade
names, trademarks, service marks, or product names of the Licensor,
except as required for reasonable and customary use in describing the
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unless required by applicable law (such as deliberate and grossly
negligent acts) or agreed to in writing, shall any Contributor be
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result of this License or out of the use or inability to use the
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has been advised of the possibility of such damages.
9. Accepting Warranty or Additional Liability. While redistributing
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and charge a fee for, acceptance of support, warranty, indemnity,
or other liability obligations and/or rights consistent with this
License. However, in accepting such obligations, You may act only
on Your own behalf and on Your sole responsibility, not on behalf
of any other Contributor, and only if You agree to indemnify,
defend, and hold each Contributor harmless for any liability
incurred by, or claims asserted against, such Contributor by reason
of your accepting any such warranty or additional liability.
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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
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Copyright (c) Individual contributors.
All rights reserved.
Redistribution and use in source and binary forms, with or without
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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licenses/jeb-utils.txt
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Copyright 2026 jCloud Services GbR
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
and distribution as defined by Sections 1 through 9 of this document.
"Licensor" shall mean the copyright owner or entity authorized by
the copyright owner that is granting the License.
"Legal Entity" shall mean the union of the acting entity and all
other entities that control, are controlled by, or are under common
control with that entity. For the purposes of this definition,
"control" means (i) the power, direct or indirect, to cause the
direction or management of such entity, whether by contract or
otherwise, or (ii) ownership of fifty percent (50%) or more of the
outstanding shares, or (iii) beneficial ownership of such entity.
"You" (or "Your") shall mean an individual or Legal Entity
exercising permissions granted by this License.
"Source" form shall mean the preferred form for making modifications,
including but not limited to software source code, documentation
source, and configuration files.
"Object" form shall mean any form resulting from mechanical
transformation or translation of a Source form, including but
not limited to compiled object code, generated documentation,
and conversions to other media types.
"Work" shall mean the work of authorship, whether in Source or
Object form, made available under the License, as indicated by a
copyright notice that is included in or attached to the work
(an example is provided in the Appendix below).
"Derivative Works" shall mean any work, whether in Source or Object
form, that is based on (or derived from) the Work and for which the
editorial revisions, annotations, elaborations, or other modifications
represent, as a whole, an original work of authorship. For the purposes
of this License, Derivative Works shall not include works that remain
separable from, or merely link (or bind by name) to the interfaces of,
the Work and Derivative Works thereof.
"Contribution" shall mean any work of authorship, including
the original version of the Work and any modifications or additions
to that Work or Derivative Works thereof, that is intentionally
submitted to Licensor for inclusion in the Work by the copyright owner
or by an individual or Legal Entity authorized to submit on behalf of
the copyright owner. For the purposes of this definition, "submitted"
means any form of electronic, verbal, or written communication sent
to the Licensor or its representatives, including but not limited to
communication on electronic mailing lists, source code control systems,
and issue tracking systems that are managed by, or on behalf of, the
Licensor for the purpose of discussing and improving the Work, but
excluding communication that is conspicuously marked or otherwise
designated in writing by the copyright owner as "Not a Contribution."
"Contributor" shall mean Licensor and any individual or Legal Entity
on behalf of whom a Contribution has been received by Licensor and
subsequently incorporated within the Work.
2. Grant of Copyright License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
copyright license to reproduce, prepare Derivative Works of,
publicly display, publicly perform, sublicense, and distribute the
Work and such Derivative Works in Source or Object form.
3. Grant of Patent License. Subject to the terms and conditions of
this License, each Contributor hereby grants to You a perpetual,
worldwide, non-exclusive, no-charge, royalty-free, irrevocable
(except as stated in this section) patent license to make, have made,
use, offer to sell, sell, import, and otherwise transfer the Work,
where such license applies only to those patent claims licensable
by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
granted to You under this License for that Work shall terminate
as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
modifications, and in Source or Object form, provided that You
meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
(b) You must cause any modified files to carry prominent notices
stating that You changed the files; and
(c) You must retain, in the Source form of any Derivative Works
that You distribute, all copyright, patent, trademark, and
attribution notices from the Source form of the Work,
excluding those notices that do not pertain to any part of
the Derivative Works; and
(d) If the Work includes a "NOTICE" text file as part of its
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licenses/pycparser.txt
+27
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@@ -0,0 +1,27 @@
pycparser -- A C parser in Python
Copyright (c) 2008-2022, Eli Bendersky
All rights reserved.
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the names of its contributors may
be used to endorse or promote products derived from this software without
specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
pyproject.toml
+10
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@@ -0,0 +1,10 @@
[build-system]
requires = ["setuptools", "wheel"]
build-backend = "setuptools.build_meta"
[project]
name = "jeb-core"
version = "0.1.0"
description = "The core for jeb"
dependencies = ["config-parser", "jeb-utils"]
license = "Apache-2.0"
src/jeb_core/__init__.py
+24
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# Copyright 2026 jCloud Services GbR
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
'''
The core for jeb
'''
from ._core import *
from ._core import __all__ as _core__all__
__all__ = [
*_core__all__
]
src/jeb_core/_core.py
+517
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@@ -0,0 +1,517 @@
# Copyright 2026 jCloud Services GbR
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from jeb_utils import exceptions, jeb_utils, utils
import os
import dbm
import config_parser
import shutil
import time
import binascii
import warnings
__all__ = [
'JEBCore',
'Segment',
'Topic',
]
def _create_file_if_not_exists(path: str, content: bytes = b''):
'''
Creates a file if it does not exist.
:param path: The file path
:type path: str
:param content: Optional, the content of the file if it is newly created.
:type content: bytes
'''
if not os.path.exists(path):
with open(path, 'wb') as f:
f.write(content)
f.close()
class JEBCore:
def __init__(self, data_dir: str, *, segment_max_size: int = 2 ** 32, fetch_records_chunk_size: int = 1024 ** 2) -> None:
'''
The core for jeb.
:param data_dir: The data directory
:type data_dir: str
:param segment_max_size: The maximum size for segments
:type segment_max_size: int
:param fetch_records_chunk_size: The size of the chunks while fetching the records
:type fetch_records_chunk_size: int
'''
self.data_dir = data_dir
self.segment_max_size = segment_max_size
self.fetch_records_chunk_size = fetch_records_chunk_size
self._log_end_offsets = {}
self._init()
def _init(self) -> None:
self._create_base_segment_files()
self._init_log_end_offsets()
def _create_base_segment_files(self) -> None:
'''
Creates the base segment files.
'''
for topic, v in self.get_topics().items():
partitions = jeb_utils.format_topic_partitions(topic, v['partitions'])
for p in partitions:
_create_file_if_not_exists(f'{self.data_dir}/topics/{p}/' + '0' * 16 + '.log')
_create_file_if_not_exists(f'{self.data_dir}/topics/{p}/' + '0' * 16 + '.index')
_create_file_if_not_exists(f'{self.data_dir}/topics/{p}/' + '0' * 16 + '.timeindex')
def _init_log_end_offsets(self) -> None:
'''
Initializes the log end offsets.
'''
global _log_end_offsets
topics = [f'{t}{jeb_utils.TOPIC_PARTITION_SEPARATOR}{p:02d}' for t, v in self.get_topics().items() for p in v['partitions']]
topic_segments = {t: Topic(t, self).segments for t in topics}
for topic, segments in topic_segments.items():
log_end_offset = 0
for segment in segments:
with open(f'{self.data_dir}/topics/{topic}/{segment.base_offset:016x}.log', 'rb') as logfile:
logfile.seek(0, os.SEEK_END)
file_size = logfile.tell()
logfile.seek(0)
while True:
record_size_bytes = logfile.read(8)
if not record_size_bytes or len(record_size_bytes) < 8:
break
record_size = int.from_bytes(record_size_bytes)
if logfile.tell() + record_size > file_size:
break
logfile.seek(record_size, os.SEEK_CUR)
log_end_offset += 1
logfile.close()
self._log_end_offsets[topic] = log_end_offset
def get_segment_base_timestamp(self, topic: str, segment: int) -> int:
'''
Returns the base timestamp of a segment.
:param topic: The topic
:type topic: str
:param segment: The segment base offset
:type segment: int
:return: The base timestamp (milliseconds since 1970)
:rtype: int
'''
with open(f'{self.data_dir}/topics/{topic}/{segment:016x}.log', 'rb') as logfile:
# go to the topic length
logfile.seek(20)
# skip topic
topic_length = int.from_bytes(logfile.read(2))
logfile.seek(topic_length + 1, os.SEEK_CUR)
timestamp_bytes = logfile.read(8)
if len(timestamp_bytes) < 8:
timestamp = None
else:
timestamp = int.from_bytes(timestamp_bytes)
return timestamp
def get_topics(self) -> dict:
'''
Returns all topics.
:return: The topics
:rtype: dict
'''
with dbm.open(f'{self.data_dir}/conf/topics', 'c') as db:
topics = {k.decode(): config_parser.parse.json.parse_json(v.decode()) for k, v in db.items()}
db.close()
return topics
def mktopic(self, topic_name: str) -> None:
'''
Creates a topic.
:param topic_name: The name of the topic
:type topic_name: str
'''
with dbm.open(f'{self.data_dir}/conf/topics', 'c') as db:
if topic_name.encode() in db.keys():
raise exceptions.TopicExistsError(f'topic \'{topic_name}\' already exists')
db[topic_name] = config_parser.serialize.json.serialize({'partitions': [1]})
db.close()
os.mkdir(f'{self.data_dir}/topics/{topic_name}{jeb_utils.TOPIC_PARTITION_SEPARATOR}01/')
def rmtopic(self, topic_name: str) -> None:
'''
Removes a topic.
:param topic_name: The topic name
:type topic_name: str
:raises TopicNotFoundError: If the topic does not exist.
'''
with dbm.open(f'{self.data_dir}/conf/topics', 'c') as db:
if topic_name.encode() not in db.keys():
raise exceptions.TopicNotFoundError(f'topic \'{topic_name}\' does not exist')
partitions = config_parser.parse.json.parse_json(db[topic_name.encode()].decode())['partitions']
del db[topic_name]
db.close()
partition_dirs = jeb_utils.format_topic_partitions(topic_name, partitions)
for pd in partition_dirs:
try:
shutil.rmtree(f'{self.data_dir}/topics/{pd}/')
except:
pass
def mktopicpart(self, topic_name: str, partition_number: int) -> None:
'''
Creates a partition of a topic.
:param topic_name: The topic name
:type topic_name: str
:param partition_number: The partition number
:type partition_number: int
'''
if partition_number < 1 or partition_number > 99:
raise ValueError('partition number must be between 1 and 99')
formatted_partition_number = f'{(int(partition_number)):02d}'
with dbm.open(f'{self.data_dir}/conf/topics', 'c') as db:
if topic_name.encode() not in db.keys():
raise exceptions.TopicNotFoundError(f'topic \'{topic_name}\' does not exist')
partitions = config_parser.parse.json.parse_json(db[topic_name.encode()].decode())['partitions']
if partition_number in partitions:
raise exceptions.TopicPartitionExistsError(f'partition \'{formatted_partition_number}\' already exists for topic \'{topic_name}\'')
db[topic_name] = config_parser.serialize.json.serialize({'partitions': sorted(list(set(partitions) | {int(formatted_partition_number)}))})
db.close()
os.mkdir(f'{self.data_dir}/topics/{topic_name}{jeb_utils.TOPIC_PARTITION_SEPARATOR}{formatted_partition_number}/')
def rmtopicpart(self, topic_name: str, partition_number: int) -> None:
'''
Removes a partition of a topic.
:param topic_name: The topic name
:type topic_name: str
:param partition_number: The partition number
:type partition_number: int
'''
formatted_partition_number = f'{(int(partition_number)):02d}'
with dbm.open(f'{self.data_dir}/conf/topics', 'c') as db:
if topic_name.encode() not in db.keys():
raise exceptions.TopicNotFoundError(f'topic \'{topic_name}\' does not exist')
partitions = config_parser.parse.json.parse_json(db[topic_name.encode()].decode())['partitions']
if partition_number not in partitions:
raise exceptions.TopicPartitionNotFoundError(f'partition \'{formatted_partition_number}\' does not exist for topic \'{topic_name}\'')
db[topic_name] = config_parser.serialize.json.serialize({'partitions': sorted(list(set(partitions) - {int(formatted_partition_number)}))})
db.close()
shutil.rmtree(f'{self.data_dir}/topics/{topic_name}{jeb_utils.TOPIC_PARTITION_SEPARATOR}{formatted_partition_number}/')
def check_topic_exists(self, topic: str) -> None:
'''
Checks whether a topic exists.
:param topic: The topic name
:type topic: str
:raises TopicNotFoundError: If the topic does not exist
:raises TopicPartitionNotFoundError: If the partition does not exist
'''
topics = self.get_topics()
topic_name, formatted_partition_number = topic.split(jeb_utils.TOPIC_PARTITION_SEPARATOR)
raw_partition_number = int(formatted_partition_number)
if topic_name not in topics:
raise exceptions.TopicNotFoundError(f'topic \'{topic_name}\' does not exist')
if raw_partition_number not in topics[topic_name]['partitions']:
raise exceptions.TopicPartitionNotFoundError(f'partition \'{formatted_partition_number}\' does not exist for topic \'{topic_name}\'')
def create_record(self, topic: str, timestamp: int, record_data: bytes, key: bytes = b'', compression_type: int = 0, headers: dict = {}) -> None:
'''
Creates a record.
:param topic: The topic name
:type topic: str
:param timestamp: The timestamp.
:type timestamp: int
:param record_data: The payload
:type record_data: bytes
:param key: The key
:type key: bytes
:param compression_type: The compression type
:type compression_type: int
:param headers: The header dictionary
:type headers: dict
'''
topic_name, formatted_partition_number = topic.split(jeb_utils.TOPIC_PARTITION_SEPARATOR)
if not jeb_utils.validate_topic_name(topic_name):
raise exceptions.FormatError(f'invalid topic name: \'{topic}\'')
self.check_topic_exists(topic)
topic_dir = f'{self.data_dir}/topics/{topic_name}{jeb_utils.TOPIC_PARTITION_SEPARATOR}{formatted_partition_number}/'
utils.create_file_if_not_exists(topic_dir + '0' * 16 + '.log')
segments = sorted([int(f.split('.')[0], 16) for f in os.listdir(topic_dir) if f.endswith('.log') and utils.is_number(f.split('.')[0], 16) and len(f.split('.')[0]) == 16])
last_segment = max(segments)
if timestamp == 0:
timestamp = int(time.time() * 1000)
timestamp_type = 1
else:
timestamp_type = 0
# Assemble record
record = b''
record += self._log_end_offsets[topic].to_bytes(8) # Offset
record += binascii.crc32(record_data).to_bytes(4) # CRC
record += (len(topic)).to_bytes(2) # Topic name length
record += topic.encode() # Topic
record += jeb_utils.AttributesByte(compression_type, timestamp_type).to_byte() # Attributes
record += timestamp.to_bytes(8) # Timestamp
record += (len(key)).to_bytes(4) # Key Length
record += key # Key
record += (len(record_data)).to_bytes(4) # Content Length
record += record_data # Content
record += (len(headers)).to_bytes(1)
for key, value in headers.items():
record += len(key).to_bytes(4)
record += key
record += len(value).to_bytes(4)
record += value
record = len(record).to_bytes(8) + record # Prepend Record Size
if os.path.getsize(topic_dir + f'{last_segment:016x}.log') + len(record) > self.segment_max_size:
last_segment = self._log_end_offsets[topic]
with open(topic_dir + f'{last_segment:016x}.log', 'ab') as logfile:
logfile.write(record)
logfile.close()
utils.create_file_if_not_exists(topic_dir + f'{last_segment:016x}.index')
utils.create_file_if_not_exists(topic_dir + f'{last_segment:016x}.timeindex')
if self._log_end_offsets[topic] % 1024 == 0:
index = self._log_end_offsets[topic].to_bytes(8) + os.path.getsize(topic_dir + f'{last_segment:016x}.log').to_bytes(4)
timeindex = timestamp.to_bytes(8) + self._log_end_offsets[topic].to_bytes(8)
with open(topic_dir + f'{last_segment:016x}.index', 'ab') as idxfile:
idxfile.write(index)
idxfile.close()
with open(topic_dir + f'{last_segment:016x}.timeindex', 'ab') as timeidxfile:
timeidxfile.write(timeindex)
timeidxfile.close()
self._log_end_offsets[topic] += 1
def fetch_records(self, topic: str, start_type: int, start: int, max_bytes: int):
'''
Fetches records from the topic and yields them in chunks.
:param topic: The topic name
:type topic: str
:param start_type: The start type
:type start_type: int
:param start: The start
:type start: int
:param max_bytes: The maximum of bytes
:type max_bytes: int
'''
topic = Topic(topic, self)
topic_name, formatted_partition_number = topic.topic_name.split(jeb_utils.TOPIC_PARTITION_SEPARATOR)
if not jeb_utils.validate_topic_name(topic_name):
raise exceptions.FormatError(f'invalid topic name: \'{topic.topic_name}\'')
if start_type not in (jeb_utils.FETCH_START_TYPE_OFFSET, jeb_utils.FETCH_START_TYPE_TIMESTAMP):
raise ValueError('invalid start type')
self.check_topic_exists(topic.topic_name)
segments = [int(f.split('.')[0], 16) for f in os.listdir(f'{self.data_dir}/topics/{topic.topic_name}/') if utils.is_number(f.split('.')[0], 16) and len(f.split('.')[0]) == 16 and f.endswith('.log')]
if start_type == jeb_utils.FETCH_START_TYPE_TIMESTAMP:
segment_base_timestamps = {s: s.base_timestamp for s in topic.segments}
s = {v: k for k, v in segment_base_timestamps.items()}[utils.find_nearest_lower_number(list(segment_base_timestamps.values()), start) or min(segment_base_timestamps.values())]
with open(f'{self.data_dir}/topics/{topic.topic_name}/{s.base_offset:016x}.timeindex', 'rb') as f:
timestamps = {}
f.seek(0)
while True:
timestamp_bytes = f.read(8)
if len(timestamp_bytes) < 8:
break
timestamp = int.from_bytes(timestamp_bytes)
offset_bytes = f.read(8)
if len(offset_bytes) < 8:
break
offset = int.from_bytes(offset_bytes)
timestamps[timestamp] = offset
f.close()
start = timestamps[utils.find_nearest_lower_number(timestamps.keys(), start) or min(timestamps.keys())]
if start < 0 or start >= self._log_end_offsets[topic.topic_name]:
# await send_block_function(b'\xb1\x31')
yield b'\xb1\x31'
return
idx_offset = jeb_utils.get_next_lower_index_entry(start)
start_seg = utils.find_nearest_lower_number(segments, start)
with open(f'{self.data_dir}/topics/{topic.topic_name}/' + f'{start_seg:016x}' + '.index', 'rb') as idxfile:
idxfile.seek(0, os.SEEK_END)
file_size = idxfile.tell()
idxfile.seek(idx_offset // 1024 * 12)
index_entry = idxfile.read(12)
idx_entry_pos = int.from_bytes(index_entry[8:])
if int.from_bytes(index_entry[:8]) != idx_offset:
warnings.warn(f'Index entry offset mismatch: expected {idx_offset}, got {int.from_bytes(index_entry[:8])}', jeb_utils.FileCorruptWarning)
idxfile.close()
with open(f'{self.data_dir}/topics/{topic.topic_name}/{start_seg:016x}.log', 'rb') as logfile:
logfile.seek(idx_entry_pos)
offset = idx_offset
record_position = 0
while offset < start:
record_length_bytes = logfile.read(8)
if len(record_length_bytes) < 8:
break
record_length = int.from_bytes(record_length_bytes)
offset_bytes = logfile.read(8)
if len(offset_bytes) < 8:
break
offset = int.from_bytes(offset_bytes)
record_position = logfile.tell() - 16
logfile.seek(record_length - 8, os.SEEK_CUR)
logfile.close()
# await send_block_function(b'\xa0\x30')
yield b'\xa0\x30'
segments = sorted(segments)
bytes_fetched = 0
for i, segment in enumerate(segments[segments.index(start_seg):]):
records_sent = 0
with open(f'{self.data_dir}/topics/{topic.topic_name}/' + f'{segment:016x}' + '.log', 'rb') as logfile:
if i == 0:
logfile.seek(record_position)
else:
logfile.seek(0)
while bytes_fetched <= max_bytes:
record_size_bytes = logfile.read(8)
if len(record_size_bytes) < 8:
break
record_size = int.from_bytes(record_size_bytes)
if bytes_fetched + 8 + record_size > max_bytes:
break
to_send = record_size_bytes
for _ in range(record_size // self.fetch_records_chunk_size):
to_send += logfile.read(self.fetch_records_chunk_size)
# await send_block_function(b'\x01' + to_send)
yield b'\x01' + to_send
to_send = b''
to_send += logfile.read(record_size % self.fetch_records_chunk_size)
# await send_block_function(b'\x01' + to_send)
yield b'\x01' + to_send
bytes_fetched += 8 + record_size
records_sent += 1
logfile.close()
if bytes_fetched >= max_bytes:
break
# await send_block_function(b'\x00') # EOF
yield b'\x00' # EOF
class Segment:
def __init__(self, topic: str, base_offset: int, jeb_core: JEBCore) -> None:
'''
Represents a segment of a topic.
:param topic: The topic name
:type topic: str
:param base_offset: The base offset of the segment
:type base_offset: int
:param jeb_core: The ``JEBCore`` instance
:type jeb_core: JEBCore
'''
self.topic = topic
self.base_offset = base_offset
self.jeb_core = jeb_core
self.base_timestamp = self.get_base_timestamp()
def __repr__(self) -> str:
return f'Segment({self.topic}, {self.base_offset})'
def get_base_timestamp(self) -> int:
'''
Returns the base timestamp of the segment.
:return: The base timestamp (milliseconds since 1970)
:rtype: int
'''
# with open(f'{self.jeb_core.data_dir}/topics/{self.topic}/{self.base_offset:016x}.timeindex', 'rb') as logfile:
# timestamp_bytes = logfile.read(8)
# if len(timestamp_bytes) < 8:
# timestamp = None
# else:
# timestamp = int.from_bytes(timestamp_bytes)
# return timestamp
return self.jeb_core.get_segment_base_timestamp(self.topic, self.base_offset)
class Topic:
def __init__(self, topic_name: str, jeb_core: JEBCore) -> None:
'''
Represents a topic.
:param topic_name: The name of the topic
:type topic_name: str
:param jeb_core: The ``JEBCore`` instance
:type jeb_core: JEBCore
'''
self.topic_name = topic_name
self.jeb_core = jeb_core
def __repr__(self) -> str:
return f'Topic({self.topic_name})'
@property
def segments(self) -> list:
'''
Returns the segments of the topic.
:return: The segments
:rtype: list
'''
return [Segment(self.topic_name, bo, self.jeb_core) for bo in sorted([int(s.split('.')[0], 16) for s in os.listdir(f'{self.jeb_core.data_dir}/topics/{self.topic_name}') if s.endswith('.log') and utils.is_number(s.split('.')[0], 16) and len(s.split('.')[0]) == 16])]