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How to use log_group_exists method in localstack

Best Python code snippet using localstack_python

loggers.py

Source:loggers.py

1import datetime2import logging3import boto34from dagster import Field, check, logger, seven5from dagster.core.log_manager import coerce_valid_log_level6# The maximum batch size is 1,048,576 bytes, and this size is calculated as the sum of all event7# messages in UTF-8, plus 26 bytes for each log event.8MAXIMUM_BATCH_SIZE = 10485769OVERHEAD = 2610EPOCH = datetime.datetime(1970, 1, 1)11# For real12def millisecond_timestamp(dt):13    td = dt - EPOCH14    microsecond_timestamp = (15        td.days * 24 * 60 * 60 * 1000000 + td.seconds * 1000000 + td.microseconds16    )17    return int(microsecond_timestamp / 1000)18class CloudwatchLogsHandler(logging.Handler):19    def __init__(20        self,21        log_group_name,22        log_stream_name,23        aws_region=None,24        aws_secret_access_key=None,25        aws_access_key_id=None,26    ):27        self.client = boto3.client(28            'logs',29            region_name=aws_region,30            aws_access_key_id=aws_access_key_id,31            aws_secret_access_key=aws_secret_access_key,32        )33        self.log_group_name = check.str_param(log_group_name, 'log_group_name')34        # Maybe we should make this optional, and default to the run_id35        self.log_stream_name = check.str_param(log_stream_name, 'log_stream_name')36        self.overhead = OVERHEAD37        self.maximum_batch_size = MAXIMUM_BATCH_SIZE38        self.sequence_token = None39        self.check_log_group()40        self.check_log_stream()41        super(CloudwatchLogsHandler, self).__init__()42    def check_log_group(self):43        # Check that log group exists44        log_group_exists = False45        next_token = None46        while not log_group_exists:47            describe_log_group_kwargs = {'logGroupNamePrefix': self.log_group_name}48            if next_token is not None:49                describe_log_group_kwargs['nextToken'] = next_token50            res = self.client.describe_log_groups(**describe_log_group_kwargs)51            if self.log_group_name in (log_group['logGroupName'] for log_group in res['logGroups']):52                log_group_exists = True53                break54            else:55                next_token = res.get('nextToken')56                if next_token is None:57                    break58        if not log_group_exists:59            raise Exception(60                'Failed to initialize Cloudwatch logger: Could not find log group with name '61                '{log_group_name}'.format(log_group_name=self.log_group_name)62            )63    def check_log_stream(self):64        # Check that log stream exists65        log_stream_exists = False66        next_token = None67        while not log_stream_exists:68            describe_log_stream_kwargs = {69                'logGroupName': self.log_group_name,70                'logStreamNamePrefix': self.log_stream_name,71            }72            if next_token is not None:73                describe_log_stream_kwargs['nextToken'] = next_token74            res = self.client.describe_log_streams(**describe_log_stream_kwargs)75            for log_stream in res['logStreams']:76                if self.log_stream_name == log_stream['logStreamName']:77                    log_stream_exists = True78                    self.sequence_token = log_stream.get('uploadSequenceToken')79                break80            else:81                next_token = res.get('nextToken')82                if next_token is None:83                    break84        if not log_stream_exists:85            raise Exception(86                'Failed to initialize Cloudwatch logger: Could not find log stream with name '87                '{log_stream_name}'.format(log_stream_name=self.log_stream_name)88            )89    def log_error(self, record, exc):90        logging.critical('Error while logging!')91        try:92            logging.error(93                'Attempted to log: {record}'.format(record=seven.json.dumps(record.__dict__))94            )95        except Exception:  # pylint: disable=broad-except96            pass97        logging.exception(str(exc))98    def emit(self, record):99        self._emit(record, retry=False)100    def retry(self, record):101        self._emit(record, retry=True)102    def _emit(self, record, retry=False):103        message = seven.json.dumps(record.__dict__)104        timestamp = millisecond_timestamp(105            datetime.datetime.strptime(record.dagster_meta['log_timestamp'], '%Y-%m-%dT%H:%M:%S.%f')106        )107        params = {108            'logGroupName': self.log_group_name,109            'logStreamName': self.log_stream_name,110            'logEvents': [{'timestamp': timestamp, 'message': message}],111        }112        if self.sequence_token is not None:113            params['sequenceToken'] = self.sequence_token114        try:115            res = self.client.put_log_events(**params)116            self.sequence_token = res['nextSequenceToken']117            log_events_rejected = res.get('rejectedLogEventsInfo')118            if log_events_rejected is not None:119                logging.error('Cloudwatch logger: log events rejected: {res}'.format(res=res))120        except self.client.exceptions.InvalidSequenceTokenException as exc:121            if not retry:122                self.check_log_stream()123                self.retry(record)124            else:125                self.log_error(record, exc)126        except self.client.exceptions.DataAlreadyAcceptedException as exc:127            logging.error('Cloudwatch logger: log events already accepted: {res}'.format(res=res))128        except self.client.exceptions.InvalidParameterException as exc:129            logging.error(130                'Cloudwatch logger: Invalid parameter exception while logging: {res}'.format(131                    res=res132                )133            )134        except self.client.exceptions.ResourceNotFoundException as exc:135            logging.error(136                'Cloudwatch logger: Resource not found. Check that the log stream or log group '137                'was not deleted: {res}'.format(res=res)138            )139        except self.client.exceptions.ServiceUnavailableException as exc:140            if not retry:141                self.retry(record)142            else:143                logging.error('Cloudwatch logger: Service unavailable: {res}'.format(res=res))144        except self.client.exceptions.ServiceUnavailableException as exc:145            if not retry:146                self.retry(record)147            else:148                logging.error(149                    'Cloudwatch logger: Unrecognized client. Check your AWS access key id and '150                    'secret key: {res}'.format(res=res)151                )152@logger(153    {154        'log_level': Field(str, is_optional=True, default_value='INFO'),155        'name': Field(str, is_optional=True, default_value='dagster'),156        'log_group_name': Field(str),157        'log_stream_name': Field(str),158        'aws_region': Field(str, is_optional=True),159        'aws_secret_access_key': Field(str, is_optional=True),160        'aws_access_key_id': Field(str, is_optional=True),161    },162    description='The default colored console logger.',163)164def cloudwatch_logger(init_context):165    level = coerce_valid_log_level(init_context.logger_config['log_level'])166    name = init_context.logger_config['name']167    klass = logging.getLoggerClass()168    logger_ = klass(name, level=level)169    logger_.addHandler(170        CloudwatchLogsHandler(171            init_context.logger_config['log_group_name'],172            init_context.logger_config['log_stream_name'],173            aws_region=init_context.logger_config.get('aws_region'),174            aws_secret_access_key=init_context.logger_config.get('aws_secret_access_key'),175            aws_access_key_id=init_context.logger_config.get('aws_access_key_id'),176        )177    )...

cloudwatchlogs.py

Source:cloudwatchlogs.py

1import boto32from botocore.exceptions import ClientError3class LogStatus:4    def __init__(self, log_group, log_stream):5        self.log_group = log_group6        self.log_stream = log_stream7        self.log_group_exists = None8        self.log_stream_exists = None9        self.upload_token = None10class CloudWatchLogs:11    def __init__(self, client=boto3.client('logs')):12        self.client = client13    def put_log_events(self, request, sequence_token_cache):14        try:15            return self._put_log_events(request, sequence_token_cache)16        except ClientError as e:17            if e.response.get("Error", {}).get("Code") != 'ResourceNotFoundException':18                raise e19            self.prepare(request['logGroupName'], request['logStreamName'])20            return self._put_log_events(request, sequence_token_cache)21    def _put_log_events(self, request, sequence_token_cache):22        cache_key = f"{request['logGroupName']}.{request['logStreamName']}"23        try:24            if cache_key in sequence_token_cache:25                sequence_token = sequence_token_cache[cache_key]26                response = self.client.put_log_events(27                    logGroupName=request['logGroupName'],28                    logStreamName=request['logStreamName'],29                    logEvents=request['logEvents'],30                    sequenceToken=sequence_token31                )32            else:33                response = self.client.put_log_events(34                    logGroupName=request['logGroupName'],35                    logStreamName=request['logStreamName'],36                    logEvents=request['logEvents'],37                )38            print(f"{request['logGroupName']}: put {len(request['logEvents'])} log events, next sequence token is {response['nextSequenceToken']}")39        except ClientError as e:40            error_code = e.response.get("Error", {}).get("Code")41            if error_code not in {'InvalidSequenceTokenException', 'DataAlreadyAcceptedException'}:42                raise e43            correct_sequence_token = str(e).split(' ')[-1]44            print(f"{request['logGroupName']}: handling {error_code}, new token is {correct_sequence_token}.")45            if correct_sequence_token != 'null':46                sequence_token_cache[cache_key] = correct_sequence_token47            else:48                sequence_token_cache.pop(cache_key, None)49            response = self._put_log_events(request, sequence_token_cache)50        sequence_token_cache[cache_key] = response['nextSequenceToken']51        return response52    def prepare(self, log_group, log_stream):53        status = LogStatus(log_group=log_group, log_stream=log_stream)54        status = self._get_upload_token_if_possible(status)55        status = self._create_log_group_if_needed(status)56        status = self._create_log_stream_if_needed(status)57        return status.upload_token58    def _get_upload_token_if_possible(self, status):59        if status.upload_token:60            return status61        return self._update_status(status)62    def _create_log_group_if_needed(self, status):63        if status.log_group_exists:64            print(f"Log group/stream exists, obtained sequence token: ${status.upload_token}")65            return status66        self.client.create_log_group(logGroupName=status.log_group)67        return status68    def _create_log_stream_if_needed(self, status):69        if status.log_stream_exists:70            return status71        try:72            self.client.create_log_stream(73                logGroupName=status.log_group,74                logStreamName=status.log_stream,75            )76            status.log_stream_exists = True77            status.upload_token = None78            return status79        except ClientError as e:80            if e.response.get("Error", {}).get("Code") != 'ResourceAlreadyExistsException':81                raise e82            print(f"${status.log_stream}: stream already existed, retrieving sequence token.")83            return self._update_status(status)84    def _update_status(self, status):85        try:86            pages = self.client.get_paginator('describe_log_streams').paginate(87                logGroupName=status.log_group,88                logStreamNamePrefix=status.log_stream89            )90            for page in pages:91                for stream in page:92                    if stream['logStreamName'] == status.log_stream:93                        status.log_group_exists = True94                        status.log_stream_exists = True95                        status.upload_token = stream['uploadSequenceToken']96                        return status97            print(f"{status.log_group}: Log group/stream exists!")98            return status99        except ClientError as e:100            if e.response.get("Error", {}).get("Code") != 'ResourceNotFoundException':101                raise e102            print(f"{status.log_group}: Log group/stream does not exist!")103            status.log_group_exists = False104            status.log_stream_exists = False...

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