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Update cluster when config file changes (#205)
Move the code that expands the config file template to a separate lambda and custom resource so we can get its sha512 hash and use it to determine when the cluster needs to be updated. Resolves #202
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131 changes: 131 additions & 0 deletions
131
source/resources/lambdas/CreateParallelClusterConfig/CreateParallelClusterConfig.py
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|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| """ | ||
| Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| SPDX-License-Identifier: MIT-0 | ||
| 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. | ||
| """ | ||
|
|
||
| ''' | ||
| Create/update/delete ParallelCluster cluster config file and save to S3 as json and yaml. | ||
| ''' | ||
| import boto3 | ||
| import cfnresponse | ||
| from hashlib import sha512 | ||
| from jinja2 import Template as Template | ||
| import json | ||
| import logging | ||
| from os import environ as environ | ||
| import pcluster.lib as pc | ||
| from pcluster.api.errors import BadRequestException, UpdateClusterBadRequestException | ||
| from time import sleep | ||
| import yaml | ||
|
|
||
| logger=logging.getLogger(__file__) | ||
| logger_formatter = logging.Formatter('%(levelname)s: %(message)s') | ||
| logger_streamHandler = logging.StreamHandler() | ||
| logger_streamHandler.setFormatter(logger_formatter) | ||
| logger.addHandler(logger_streamHandler) | ||
| logger.setLevel(logging.INFO) | ||
| logger.propagate = False | ||
|
|
||
| def lambda_handler(event, context): | ||
| try: | ||
| logger.info(f"event:\n{json.dumps(event, indent=4)}") | ||
| cluster_name = None | ||
| requestType = event['RequestType'] | ||
| properties = event['ResourceProperties'] | ||
| required_properties = [ | ||
| 'ParallelClusterConfigTemplateYamlHash' | ||
| ] | ||
| error_message = "" | ||
| for property in required_properties: | ||
| try: | ||
| value = properties[property] | ||
| except: | ||
| error_message += f"Missing {property} property. " | ||
| if error_message: | ||
| logger.info(error_message) | ||
| if requestType == 'Delete': | ||
| cfnresponse.send(event, context, cfnresponse.SUCCESS, {}, physicalResourceId=cluster_name) | ||
| return | ||
| else: | ||
| raise KeyError(error_message) | ||
|
|
||
| s3_client = boto3.client('s3') | ||
|
|
||
| yaml_template_key = environ['ParallelClusterConfigYamlTemplateS3Key'] | ||
| yaml_template_s3_url = f"s3://{environ['ParallelClusterConfigS3Bucket']}/{yaml_template_key}" | ||
|
|
||
| yaml_key = f"{environ['ParallelClusterConfigYamlS3Key']}" | ||
| yaml_s3_url = f"s3://{environ['ParallelClusterConfigS3Bucket']}/{yaml_key}" | ||
|
|
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| parallel_cluster_config_hash = sha512() | ||
|
|
||
| if requestType == 'Delete': | ||
| logger.info(f"Deleting Parallel Cluster yaml config template in {yaml_template_s3_url}") | ||
| try: | ||
| s3_client.delete_object( | ||
| Bucket = environ['ParallelClusterConfigS3Bucket'], | ||
| Key = yaml_template_key | ||
| ) | ||
| except: | ||
| pass | ||
|
|
||
| logger.info(f"Deleting Parallel Cluster yaml config in {yaml_s3_url}") | ||
| try: | ||
| s3_client.delete_object( | ||
| Bucket = environ['ParallelClusterConfigS3Bucket'], | ||
| Key = yaml_key | ||
| ) | ||
| except: | ||
| pass | ||
| else: # Create or Update | ||
| parallel_cluster_config_yaml_template = Template( | ||
| s3_client.get_object( | ||
| Bucket = environ['ParallelClusterConfigS3Bucket'], | ||
| Key = yaml_template_key | ||
| )['Body'].read().decode('utf-8')) | ||
|
|
||
| template_vars = {} | ||
| for template_var in environ: | ||
| template_vars[template_var] = environ[template_var] | ||
| logger.info(f"template_vars:\n{json.dumps(template_vars, indent=4, sort_keys=True)}") | ||
| parallel_cluster_config_yaml = parallel_cluster_config_yaml_template.render(**template_vars) | ||
|
|
||
| parallel_cluster_config_hash.update(bytes(parallel_cluster_config_yaml, 'utf-8')) | ||
| logger.info(f"Config hash: {parallel_cluster_config_hash.hexdigest()}") | ||
|
|
||
| parallel_cluster_config = yaml.load(parallel_cluster_config_yaml, Loader=yaml.FullLoader) | ||
| logger.info(f"HeadNode config:\n{json.dumps(parallel_cluster_config['HeadNode'], indent=4)}") | ||
|
|
||
| logger.info(f"Saving Parallel Cluster yaml config in {yaml_s3_url}") | ||
| s3_client.put_object( | ||
| Bucket = environ['ParallelClusterConfigS3Bucket'], | ||
| Key = yaml_key, | ||
| Body = parallel_cluster_config_yaml | ||
| ) | ||
|
|
||
| except Exception as e: | ||
| logger.exception(str(e)) | ||
| cfnresponse.send(event, context, cfnresponse.FAILED, {'error': str(e)}, physicalResourceId=cluster_name) | ||
| sns_client = boto3.client('sns') | ||
| sns_client.publish( | ||
| TopicArn = environ['ErrorSnsTopicArn'], | ||
| Subject = f"{cluster_name} CreateParallelClusterConfig failed", | ||
| Message = str(e) | ||
| ) | ||
| logger.info(f"Published error to {environ['ErrorSnsTopicArn']}") | ||
| raise | ||
|
|
||
| cfnresponse.send(event, context, cfnresponse.SUCCESS, {'ConfigTemplateYamlS3Url': yaml_template_s3_url, 'ConfigYamlS3Url': yaml_s3_url, 'ConfigYamlHash': parallel_cluster_config_hash.hexdigest()}, physicalResourceId=cluster_name) |
1 change: 1 addition & 0 deletions
1
source/resources/lambdas/CreateParallelClusterConfig/cfnresponse.py
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| ../cfnresponse.py |