150 lines
5.1 KiB
Python
150 lines
5.1 KiB
Python
# Copyright 2016 Hewlett Packard Enterprise Development Company LP
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import abc
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import json
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import logging
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import os
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import six
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log = logging.getLogger(__name__)
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class OffsetSpec(object):
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def __init__(self, app_name=None, topic=None, partition=None,
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from_offset=None, until_offset=None):
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self.app_name = app_name
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self.topic = topic
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self.partition = partition
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self.from_offset = from_offset
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self.until_offset = until_offset
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def get_app_name(self):
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return self.app_name
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def get_topic(self):
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return self.topic
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def get_partition(self):
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return self.partition
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def get_from_offset(self):
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return self.from_offset
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def get_until_offset(self):
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return self.until_offset
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@six.add_metaclass(abc.ABCMeta)
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class OffsetSpecs(object):
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"""Class representing offset specs to help recover.
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From where processing should pick up in case of failure
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"""
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@abc.abstractmethod
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def add(self, app_name, topic, partition,
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from_offset, until_offset):
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raise NotImplementedError(
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"Class %s doesn't implement add(self, app_name, topic, "
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"partition, from_offset, until_offset)"
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% self.__class__.__name__)
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@abc.abstractmethod
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def get_kafka_offsets(self):
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raise NotImplementedError(
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"Class %s doesn't implement get_kafka_offsets()"
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% self.__class__.__name__)
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@abc.abstractmethod
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def delete_all_kafka_offsets(self):
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raise NotImplementedError(
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"Class %s doesn't implement delete_all_kafka_offsets()"
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% self.__class__.__name__)
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class JSONOffsetSpecs(OffsetSpecs):
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def __init__(self, path=None, filename=None):
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self.kafka_offset_spec_file = os.path.join(
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(path or "/tmp/"), (filename or 'kafka_offset_specs.json'))
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self._kafka_offsets = {}
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if os.path.exists(self.kafka_offset_spec_file):
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try:
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f = open(self.kafka_offset_spec_file)
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kafka_offset_dict = json.load(f)
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for key, value in kafka_offset_dict.items():
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log.info("Found offset %s: %s", key, value)
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self._kafka_offsets[key] = OffsetSpec(
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app_name=value.get('app_name'),
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topic=value.get('topic'),
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until_offset=value.get('until_offset'),
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from_offset=value.get('from_offset'),
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partition=value.get('partition')
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)
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except Exception:
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log.info('Invalid or corrupts offsets file found at %s,'
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' starting over' % self.kafka_offset_spec_file)
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else:
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log.info('No kafka offsets found at startup')
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def _save(self):
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"""get the specs of last run time of offset
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"""
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log.info("Saving json offsets: %s", self._kafka_offsets)
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with open(self.kafka_offset_spec_file, 'w') as offset_file:
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offset_file.write('{')
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# json_values = []
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# for key, value in self._kafka_offsets.items():
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# json_values.append({key: })
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offset_file.write(','.join(
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['\"%s\": %s' % (key, json.dumps(self.as_dict(value)))
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for key, value in self._kafka_offsets.items()]))
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offset_file.write('}')
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@staticmethod
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def as_dict(offset_value):
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return {"app_name": offset_value.get_app_name(),
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"topic": offset_value.get_topic(),
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"partition": offset_value.get_partition(),
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"from_offset": offset_value.get_from_offset(),
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"until_offset": offset_value.get_until_offset()}
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def add(self, app_name, topic, partition,
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from_offset, until_offset):
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key_name = "%s_%s_%s" % (
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app_name, topic, partition)
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offset = OffsetSpec(
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app_name=app_name,
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topic=topic,
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partition=partition,
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from_offset=from_offset,
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until_offset=until_offset
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)
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log.info('Adding offset %s for key %s to current offsets: %s' %
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(offset, key_name, self._kafka_offsets))
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self._kafka_offsets[key_name] = offset
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log.info('Added so kafka offset is now %s', self._kafka_offsets)
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self._save()
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def get_kafka_offsets(self):
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return self._kafka_offsets
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def delete_all_kafka_offsets(self):
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log.info("Deleting json offsets file: %s", self.kafka_offset_spec_file)
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os.remove(self.kafka_offset_spec_file)
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