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Posted to commits@streampipes.apache.org by wi...@apache.org on 2020/07/19 13:10:13 UTC
[incubator-streampipes] branch dev updated: [STREAMPIPES-174] Port
current POC to core repository
This is an automated email from the ASF dual-hosted git repository.
wiener pushed a commit to branch dev
in repository https://gitbox.apache.org/repos/asf/incubator-streampipes.git
The following commit(s) were added to refs/heads/dev by this push:
new 3b9ed0c [STREAMPIPES-174] Port current POC to core repository
3b9ed0c is described below
commit 3b9ed0c5675f39db88d5d0477c6304a8701d0944
Author: Patrick Wiener <wi...@fzi.de>
AuthorDate: Sun Jul 19 15:09:50 2020 +0200
[STREAMPIPES-174] Port current POC to core repository
---
.gitignore | 7 +
pom.xml | 1 +
streampipes-wrapper-python/LICENSE | 201 +++++++++++++++++++++
streampipes-wrapper-python/NOTICE | 7 +
streampipes-wrapper-python/README.md | 44 +++++
.../apache_streampipes_python.egg-info/PKG-INFO | 60 ++++++
.../apache_streampipes_python.egg-info/SOURCES.txt | 15 ++
.../dependency_links.txt | 1 +
.../requires.txt | 3 +
.../top_level.txt | 1 +
streampipes-wrapper-python/build-distribution.sh | 38 ++++
streampipes-wrapper-python/pom.xml | 15 ++
streampipes-wrapper-python/requirements.txt | 8 +
streampipes-wrapper-python/setup.py | 52 ++++++
streampipes-wrapper-python/streampipes/__init__.py | 23 +++
streampipes-wrapper-python/streampipes/api.py | 70 +++++++
.../streampipes/configuration.py | 31 ++++
streampipes-wrapper-python/streampipes/core.py | 182 +++++++++++++++++++
streampipes-wrapper-python/streampipes/helper.py | 28 +++
streampipes-wrapper-python/streampipes/manager.py | 72 ++++++++
20 files changed, 859 insertions(+)
diff --git a/.gitignore b/.gitignore
index 1e0981e..c3c60ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -143,3 +143,10 @@ logs/
# Explicit includes
!.idea/runConfigurations
+
+# Python
+venv
+*pyc
+dist/
+*whl
+__pycache__
diff --git a/pom.xml b/pom.xml
index a602ffe..4cdfcab 100644
--- a/pom.xml
+++ b/pom.xml
@@ -859,6 +859,7 @@
<module>streampipes-wrapper-distributed</module>
<module>streampipes-wrapper-flink</module>
<module>streampipes-wrapper-kafka-streams</module>
+ <module>streampipes-wrapper-python</module>
<module>streampipes-wrapper-siddhi</module>
<module>streampipes-wrapper-spark</module>
<module>streampipes-wrapper-standalone</module>
diff --git a/streampipes-wrapper-python/LICENSE b/streampipes-wrapper-python/LICENSE
new file mode 100644
index 0000000..56ee3c8
--- /dev/null
+++ b/streampipes-wrapper-python/LICENSE
@@ -0,0 +1,201 @@
+ 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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+ "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
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+ 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.
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+ "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
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+ communication on electronic mailing lists, source code control systems,
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+ "Contributor" shall mean Licensor and any individual or Legal Entity
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+ 2. Grant of Copyright License. Subject to the terms and conditions of
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+ as of the date such litigation is filed.
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+ 4. Redistribution. You may reproduce and distribute copies of the
+ Work or Derivative Works thereof in any medium, with or without
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+ meet the following conditions:
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+ (a) You must give any other recipients of the Work or
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+ (b) You must cause any modified files to carry prominent notices
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+ (c) You must retain, in the Source form of any Derivative Works
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+ for use, reproduction, or distribution of Your modifications, or
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+ the conditions stated in this License.
+
+ 5. Submission of Contributions. Unless You explicitly state otherwise,
+ any Contribution intentionally submitted for inclusion in the Work
+ by You to the Licensor shall be under the terms and conditions of
+ this License, without any additional terms or conditions.
+ Notwithstanding the above, nothing herein shall supersede or modify
+ 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
+ origin of the Work and reproducing the content of the NOTICE file.
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+ 7. Disclaimer of Warranty. Unless required by applicable law or
+ agreed to in writing, Licensor provides the Work (and each
+ Contributor provides its Contributions) on an "AS IS" BASIS,
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+ whether in tort (including negligence), contract, or otherwise,
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+ APPENDIX: How to apply the Apache License to your work.
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+ boilerplate notice, with the fields enclosed by brackets "[]"
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+ Unless required by applicable law or agreed to in writing, software
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+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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\ No newline at end of file
diff --git a/streampipes-wrapper-python/NOTICE b/streampipes-wrapper-python/NOTICE
new file mode 100644
index 0000000..17b697e
--- /dev/null
+++ b/streampipes-wrapper-python/NOTICE
@@ -0,0 +1,7 @@
+Apache StreamPipes (incubating)
+Copyright 2020 The Apache Software Foundation.
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).
+
+============================================================================
\ No newline at end of file
diff --git a/streampipes-wrapper-python/README.md b/streampipes-wrapper-python/README.md
new file mode 100644
index 0000000..c5dccd8
--- /dev/null
+++ b/streampipes-wrapper-python/README.md
@@ -0,0 +1,44 @@
+# Apache StreamPipes Wrapper for Python
+
+**NOTE**:
+
+THIS IS WIP. IT CURRENTLY ONLY WORKS IN INTERPLAY WITH A JAVA PROCESSOR IMPLEMENTING THE MODEL.
+
+### A minimal example
+#### Define a processor
+```
+from streampipes.core import EventProcessor
+
+
+class HelloWorldProcessor(EventProcessor):
+
+ def on_invocation(self):
+ pass
+
+ def on_event(self, event):
+ event['greeting'] = 'hello world'
+ return event
+
+ def on_detach(self):
+ pass
+```
+This processor received an event `dict` and adds a new `greeting` field including the message `hello world` to it.
+#### Add to processor dict
+````
+from streampipes.core import StandaloneSubmitter
+from streampipes.manager import Declarer
+
+
+def main():
+ processors = {
+ 'org.apache.streampipes.processors.python.helloworld': HelloWorldProcessor,
+ }
+
+ Declarer.add(processors=processors)
+ StandaloneSubmitter.init()
+
+
+if __name__ == '__main__':
+ main()
+````
+Add the newly defined `HelloWorldProcessor` to the processors dictionary including a unique id `org.apache.streampipes.processors.python.helloworld`.
diff --git a/streampipes-wrapper-python/apache_streampipes_python.egg-info/PKG-INFO b/streampipes-wrapper-python/apache_streampipes_python.egg-info/PKG-INFO
new file mode 100644
index 0000000..a34a2c1
--- /dev/null
+++ b/streampipes-wrapper-python/apache_streampipes_python.egg-info/PKG-INFO
@@ -0,0 +1,60 @@
+Metadata-Version: 2.1
+Name: apache-streampipes-python
+Version: 0.67.0-SNAPSHOT
+Summary: Apache StreamPipes Python Wrapper
+Home-page: https://github.com/apache/incubator-streampipes
+Author: Apache Software Foundation
+Author-email: dev@streampipes.apache.org
+License: https://www.apache.org/licenses/LICENSE-2.0
+Description: # Apache StreamPipes Wrapper for Python
+
+ **NOTE**:
+
+ THIS IS WIP. IT CURRENTLY ONLY WORKS IN INTERPLAY WITH A JAVA PROCESSOR IMPLEMENTING THE MODEL.
+
+ ### A minimal example
+ #### Define a processor
+ ```
+ from streampipes.core import EventProcessor
+
+
+ class HelloWorldProcessor(EventProcessor):
+
+ def on_invocation(self):
+ pass
+
+ def on_event(self, event):
+ event['greeting'] = 'hello world'
+ return event
+
+ def on_detach(self):
+ pass
+ ```
+ This processor received an event `dict` and adds a new `greeting` field including the message `hello world` to it.
+ #### Add to processor dict
+ ````
+ from streampipes.core import StandaloneSubmitter
+ from streampipes.manager import Declarer
+
+
+ def main():
+ processors = {
+ 'org.apache.streampipes.processors.python.helloworld': HelloWorldProcessor,
+ }
+
+ Declarer.add(processors=processors)
+ StandaloneSubmitter.init()
+
+
+ if __name__ == '__main__':
+ main()
+ ````
+ Add the newly defined `HelloWorldProcessor` to the processors dictionary including a unique id `org.apache.streampipes.processors.python.helloworld`.
+
+Platform: UNKNOWN
+Classifier: License :: OSI Approved :: Apache Software License
+Classifier: Programming Language :: Python :: 3.5
+Classifier: Programming Language :: Python :: 3.6
+Classifier: Programming Language :: Python :: 3.7
+Requires-Python: >=3.5
+Description-Content-Type: text/markdown
diff --git a/streampipes-wrapper-python/apache_streampipes_python.egg-info/SOURCES.txt b/streampipes-wrapper-python/apache_streampipes_python.egg-info/SOURCES.txt
new file mode 100644
index 0000000..fe3801e
--- /dev/null
+++ b/streampipes-wrapper-python/apache_streampipes_python.egg-info/SOURCES.txt
@@ -0,0 +1,15 @@
+LICENSE
+NOTICE
+README.md
+setup.py
+apache_streampipes_python.egg-info/PKG-INFO
+apache_streampipes_python.egg-info/SOURCES.txt
+apache_streampipes_python.egg-info/dependency_links.txt
+apache_streampipes_python.egg-info/requires.txt
+apache_streampipes_python.egg-info/top_level.txt
+streampipes/__init__.py
+streampipes/api.py
+streampipes/configuration.py
+streampipes/core.py
+streampipes/helper.py
+streampipes/manager.py
\ No newline at end of file
diff --git a/streampipes-wrapper-python/apache_streampipes_python.egg-info/dependency_links.txt b/streampipes-wrapper-python/apache_streampipes_python.egg-info/dependency_links.txt
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/streampipes-wrapper-python/apache_streampipes_python.egg-info/dependency_links.txt
@@ -0,0 +1 @@
+
diff --git a/streampipes-wrapper-python/apache_streampipes_python.egg-info/requires.txt b/streampipes-wrapper-python/apache_streampipes_python.egg-info/requires.txt
new file mode 100644
index 0000000..cb526af
--- /dev/null
+++ b/streampipes-wrapper-python/apache_streampipes_python.egg-info/requires.txt
@@ -0,0 +1,3 @@
+confluent-kafka==1.4.2
+Flask==1.1.2
+waitress==1.4.4
diff --git a/streampipes-wrapper-python/apache_streampipes_python.egg-info/top_level.txt b/streampipes-wrapper-python/apache_streampipes_python.egg-info/top_level.txt
new file mode 100644
index 0000000..d919eee
--- /dev/null
+++ b/streampipes-wrapper-python/apache_streampipes_python.egg-info/top_level.txt
@@ -0,0 +1 @@
+streampipes
diff --git a/streampipes-wrapper-python/build-distribution.sh b/streampipes-wrapper-python/build-distribution.sh
new file mode 100755
index 0000000..32075a7
--- /dev/null
+++ b/streampipes-wrapper-python/build-distribution.sh
@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+
+CURR_DIR=`pwd`
+BASE_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"
+
+###########################
+
+cd ${BASE_DIR}
+
+rm -fr dist
+
+docker run \
+ -v "$BASE_DIR:/app" \
+ --workdir /app \
+ -i python:3.7-alpine \
+ python3 setup.py sdist bdist_wheel
+
+rm -fr streampipes_python.egg-info
+rm -fr build
+
+echo "Built Python SDK wheels and packages at ${BASE_DIR}/dist."
+
+cd ${CURR_DIR}
\ No newline at end of file
diff --git a/streampipes-wrapper-python/pom.xml b/streampipes-wrapper-python/pom.xml
new file mode 100644
index 0000000..608813f
--- /dev/null
+++ b/streampipes-wrapper-python/pom.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+ <parent>
+ <artifactId>streampipes-parent</artifactId>
+ <groupId>org.apache.streampipes</groupId>
+ <version>0.67.0-SNAPSHOT</version>
+ </parent>
+ <modelVersion>4.0.0</modelVersion>
+
+ <artifactId>streampipes-wrapper-python</artifactId>
+
+
+</project>
\ No newline at end of file
diff --git a/streampipes-wrapper-python/requirements.txt b/streampipes-wrapper-python/requirements.txt
new file mode 100644
index 0000000..1008c86
--- /dev/null
+++ b/streampipes-wrapper-python/requirements.txt
@@ -0,0 +1,8 @@
+click==7.1.2
+confluent-kafka==1.4.2
+Flask==1.1.2
+itsdangerous==1.1.0
+Jinja2==2.11.2
+MarkupSafe==1.1.1
+waitress==1.4.4
+Werkzeug==1.0.1
diff --git a/streampipes-wrapper-python/setup.py b/streampipes-wrapper-python/setup.py
new file mode 100644
index 0000000..dcef38c
--- /dev/null
+++ b/streampipes-wrapper-python/setup.py
@@ -0,0 +1,52 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+""""""
+
+from setuptools import setup
+
+import io
+import os
+
+this_directory = os.path.abspath(os.path.dirname(__file__))
+with io.open(os.path.join(this_directory, 'README.md'), 'r', encoding='utf-8') as f:
+ long_description = f.read()
+
+setup(
+ name='apache-streampipes-python',
+ version='0.67.0-SNAPSHOT',
+ packages=["streampipes"],
+ url='https://github.com/apache/incubator-streampipes',
+ license='https://www.apache.org/licenses/LICENSE-2.0',
+ license_files=["LICENSE", "NOTICE"],
+ author='Apache Software Foundation',
+ author_email='dev@streampipes.apache.org',
+ description='Apache StreamPipes Python Wrapper',
+ long_description=long_description,
+ long_description_content_type='text/markdown',
+ install_requires=[
+ 'confluent-kafka==1.4.2',
+ 'Flask==1.1.2',
+ 'waitress==1.4.4',
+ ],
+ tests_require=[],
+ python_requires='>=3.5',
+ classifiers=[
+ 'License :: OSI Approved :: Apache Software License',
+ 'Programming Language :: Python :: 3.5',
+ 'Programming Language :: Python :: 3.6',
+ 'Programming Language :: Python :: 3.7']
+)
\ No newline at end of file
diff --git a/streampipes-wrapper-python/streampipes/__init__.py b/streampipes-wrapper-python/streampipes/__init__.py
new file mode 100644
index 0000000..5cb9710
--- /dev/null
+++ b/streampipes-wrapper-python/streampipes/__init__.py
@@ -0,0 +1,23 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+"""global logging"""
+
+import logging
+
+LOGGING_FORMAT = "%(asctime)s [%(levelname)s] %(name)s — [%(filename)s:%(lineno)s - %(funcName)s()] — %(message)s"
+logging.basicConfig(level=logging.INFO, format=LOGGING_FORMAT)
+logging.getLogger(__name__).addHandler(logging.NullHandler())
\ No newline at end of file
diff --git a/streampipes-wrapper-python/streampipes/api.py b/streampipes-wrapper-python/streampipes/api.py
new file mode 100644
index 0000000..39dbe6e
--- /dev/null
+++ b/streampipes-wrapper-python/streampipes/api.py
@@ -0,0 +1,70 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+""" API endpoints """
+from flask import request, jsonify, Flask
+from waitress import serve
+
+from streampipes.configuration import flask_host, port
+from streampipes.manager import ProcessorDispatcher
+
+
+class EndpointAction(object):
+ def __init__(self, action):
+ self.action = action
+
+ def __call__(self, *args, **kwargs):
+ """ call corresponding handler method """
+ response = self.action(**request.get_json())
+ return jsonify(response)
+
+
+class API(object):
+ """ EventProcessorAPI contains relevant RESTful endpoints to start and stop """
+ app = None
+
+ def __init__(self, name='python-processor'):
+ self.app = Flask(name)
+ self.add_endpoints()
+
+ def run(self):
+ serve(self.app, host=flask_host, port=port)
+
+ def add_endpoints(self):
+ """ define and add event processor API endpoints """
+ self.add_endpoint(endpoint='/invoke', endpoint_name='/invoke', methods=['POST'], handler=self.invoke)
+ self.add_endpoint(endpoint='/detach', endpoint_name='/detach', methods=['POST'], handler=self.detach)
+
+ def add_endpoint(self, endpoint=None, endpoint_name=None, handler=None, methods=None):
+ self.app.add_url_rule(endpoint, endpoint_name, EndpointAction(handler), methods=methods)
+
+ @staticmethod
+ def invoke(**kwargs):
+ """ Receives invocation graph from pipeline management in the backend
+
+ :param json: contains invocation graph.
+ :return: None.
+ """
+ return ProcessorDispatcher.start(app_id=kwargs.get('processor_id'), **kwargs)
+
+ @staticmethod
+ def detach(**kwargs):
+ """ Receives elementId to be terminated from pipeline management in the backend
+
+ :param json: contains elementId to be terminated
+ :return: None.
+ """
+ return ProcessorDispatcher.stop(invocation_id=kwargs.get('invocation_id'))
\ No newline at end of file
diff --git a/streampipes-wrapper-python/streampipes/configuration.py b/streampipes-wrapper-python/streampipes/configuration.py
new file mode 100644
index 0000000..1a6ae11
--- /dev/null
+++ b/streampipes-wrapper-python/streampipes/configuration.py
@@ -0,0 +1,31 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+"""config file"""
+import os
+
+flask_host = os.getenv('FLASK_HOST', '0.0.0.0')
+port = os.getenv('SP_PORT', 5000)
+kafka_thread = 'kafka_thread'
+
+banner="""\
+ _______ __ ______ __
+| __| |_.----.-----.---.-.--------.| __ \__|.-----.-----.-----.
+|__ | _| _| -__| _ | || __/ || _ | -__|__ --|
+|_______|____|__| |_____|___._|__|__|__||___| |__|| __|_____|_____|
+ |__|
+** StreamPipes Pipeline Element Container for Python **
+ """
diff --git a/streampipes-wrapper-python/streampipes/core.py b/streampipes-wrapper-python/streampipes/core.py
new file mode 100644
index 0000000..346e04f
--- /dev/null
+++ b/streampipes-wrapper-python/streampipes/core.py
@@ -0,0 +1,182 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+"""contains relevant base classes"""
+import json
+import logging
+import queue
+import uuid
+from abc import ABC, abstractmethod
+from streampipes.api import API
+from streampipes.configuration import kafka_thread, banner
+from confluent_kafka import Producer, Consumer
+from streampipes.helper import threaded
+
+
+class StandaloneSubmitter(ABC):
+ @classmethod
+ def init(cls):
+ cls._load_banner()
+ cls.api = API()
+ cls.api.run()
+
+ @classmethod
+ def _load_banner(cls):
+ print(banner)
+
+
+class EventProcessor(ABC):
+ _DEFAULT_KAFKA_CONSUMER_CONFIG = {
+ 'bootstrap.servers': 'kafka:9092',
+ 'enable.auto.commit': True,
+ 'auto.commit.interval.ms': 10000,
+ 'session.timeout.ms': 30000,
+ 'fetch.max.bytes': 5000012,
+ 'auto.offset.reset': 'latest',
+ 'group.id': 'streampipes_python_' + str(uuid.uuid4()),
+ }
+
+ _DEFAULT_KAFKA_PRODUCER_CONFIG = {
+ 'bootstrap.servers': 'kafka:9092',
+ 'acks': 'all',
+ 'retries': 0,
+ 'linger.ms': 20,
+ }
+
+ def __init__(self, **kwargs):
+ """initialize EventProcessor with Kafka Prodcuer and Consumer"""
+ self.logger = logging.getLogger(__name__)
+ self._input_topics = kwargs.get('input_topics')
+ self._output_topics = kwargs.get('output_topics')
+ self._invocation_id = kwargs.get('invocation_id')
+ self._bootstrap_servers = kwargs.get('bootstrap_servers')
+ self.static_properties = kwargs.get('static_properties')
+
+ # exchange events via queue - maybe register callback would be better
+ self.queue = queue.Queue(maxsize=0)
+ self._running = False
+ self._threads = {}
+
+ if self._bootstrap_servers is not None:
+ self._DEFAULT_KAFKA_CONSUMER_CONFIG['bootstrap.servers'] = self._bootstrap_servers
+ self._DEFAULT_KAFKA_PRODUCER_CONFIG['bootstrap.servers'] = self._bootstrap_servers
+
+ self._producer = Producer(**self._DEFAULT_KAFKA_PRODUCER_CONFIG)
+ self._consumer = Consumer(**self._DEFAULT_KAFKA_CONSUMER_CONFIG)
+ #self._create_topic(topic=self._output_topics, conf=self._DEFAULT_KAFKA_PRODUCER_CONFIG)
+
+ self.on_invocation()
+
+ def init(self):
+ self.logger.info('start processor {}'.format(self._invocation_id))
+ self._threads[kafka_thread] = self.kafka_thread_main()
+
+ def active_threads(self):
+ return self._threads
+
+ @property
+ def invoke_id(self):
+ return self._invocation_id
+
+ def __del__(self):
+ pass
+
+ @abstractmethod
+ def on_invocation(self):
+ """ on_invocation is called when processor is started """
+
+ @abstractmethod
+ def on_event(self, event):
+ """ on_event receives kafka consumer messages """
+ pass
+
+ @abstractmethod
+ def on_detach(self):
+ """ on_detach is called when processor is stopped """
+ pass
+
+ def _on_event(self, event):
+ result = self.on_event(event)
+
+ if result is not None:
+ self._produce(result)
+
+ @threaded
+ def kafka_thread_main(self):
+ """ start threaded kafka consumer """
+ try:
+ self._consumer_run(self._input_topics)
+ except KeyboardInterrupt:
+ self.logger.info("consumer: aborted by user")
+ self._running = False
+ except Exception as ex:
+ self.logger.fatal("consumer: fatal exception: {}".format(ex))
+ self._running = False
+
+ def _consumer_run(self, topics):
+ """ retrieve events from kafka """
+ self._consumer.subscribe(topics=[topics])
+ self._running = True
+
+ while self._running:
+ # fetch records from kafka and send to
+ msg = self._consumer.poll(timeout=1.0)
+
+ if msg is None:
+ continue
+ elif msg.error():
+ if msg.error().str() != "Broker: No more messages":
+ self.logger.error("Consumer error: {}".format(msg.error()))
+ continue
+ else:
+ try:
+ event = json.loads(msg.value().decode('utf-8'))
+ if isinstance(event, int):
+ self.logger.info("Integer not allowed {}".format(event))
+ continue
+ except ValueError as e:
+ self.logger.info("Not a valid json {}".format(e))
+ continue
+
+ self._on_event(event)
+
+ def _produce(self, result):
+ """ send events to kafka """
+ event = json.dumps(result).encode('utf-8')
+ try:
+ self._producer.produce(self._output_topics, value=event)
+ except BufferError:
+ self._producer.poll(1)
+
+ # def _create_topic(self, topic=None, conf=None):
+ # """ Create the topic if it doesn't exist """
+ # admin = AdminClient(conf)
+ # fs = admin.create_topics([NewTopic(topic, num_partitions=1, replication_factor=1)])
+ # f = fs[topic]
+ # try:
+ # f.result()
+ # except KafkaException as ex:
+ # if ex.args[0].code() == KafkaError.TOPIC_ALREADY_EXISTS:
+ # self.logger.warning("Topic {} already exists: continue".format(topic))
+ # else:
+ # raise
+
+ def stop(self):
+ self.logger.info('stop processor {}'.format(self._invocation_id))
+ self._running = False
+ self._consumer.close()
+ self._producer.flush()
+ self.on_detach()
diff --git a/streampipes-wrapper-python/streampipes/helper.py b/streampipes-wrapper-python/streampipes/helper.py
new file mode 100644
index 0000000..44a6b44
--- /dev/null
+++ b/streampipes-wrapper-python/streampipes/helper.py
@@ -0,0 +1,28 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+"""some helper methods"""
+import threading
+
+
+def threaded(func):
+ def wrapper(*args, **kwargs):
+ thread_name = args[0]._invocation_id
+ thread = threading.Thread(target=func, args=args, kwargs=kwargs, name=thread_name)
+ thread.start()
+ return thread
+
+ return wrapper
\ No newline at end of file
diff --git a/streampipes-wrapper-python/streampipes/manager.py b/streampipes-wrapper-python/streampipes/manager.py
new file mode 100644
index 0000000..d7a2d50
--- /dev/null
+++ b/streampipes-wrapper-python/streampipes/manager.py
@@ -0,0 +1,72 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements. See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+"""Manages processor life cycle"""
+import logging
+from abc import ABC
+from streampipes.configuration import kafka_thread
+
+
+class Declarer(ABC):
+ """ EventProcessorManager holds running processor instances """
+ _processors = {}
+
+ @classmethod
+ def add(cls, processors=None):
+ """ holds dict with <app_id, processor class>"""
+ cls._processors = processors
+
+ @classmethod
+ def get_processor(cls, key):
+ return cls._processors[key]
+
+ @classmethod
+ def get(cls):
+ return cls._processors
+
+
+class ProcessorDispatcher(ABC):
+ _running_instances = {}
+ logger = logging.getLogger(__name__)
+
+ @classmethod
+ def start(cls, processor_id=None, **kwargs):
+ try:
+ processor = Declarer.get_processor(processor_id)(**kwargs)
+ processor.init()
+ cls._running_instances[processor.invoke_id] = processor
+ return {'status': 'success'}
+
+ except KeyError:
+ err = "KeyError. processor_id not found"
+ cls.logger.info('{}: {}'.format(err,processor_id))
+ return {'status': err}
+
+ @classmethod
+ def stop(cls, invocation_id=None):
+ try:
+ processor = cls._running_instances[invocation_id]
+ active_threads = processor.active_threads()
+ processor.stop()
+ active_threads[kafka_thread].join()
+ del processor
+ cls._running_instances.pop(invocation_id)
+ return {'status': 'success'}
+
+ except KeyError:
+ err = "KeyError. invocation_id not found"
+ cls.logger.info('{}: {}'.format(err,invocation_id))
+ return {'status': err}
\ No newline at end of file