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from airflow.hooks.postgres_hook import PostgresHook
from airflow.hooks.S3_hook import S3Hook
from airflow.models import BaseOperator
from airflow.utils.decorators import apply_defaults
[docs]class S3ToRedshiftTransfer(BaseOperator):
"""
Executes an COPY command to load files from s3 to Redshift
:param schema: reference to a specific schema in redshift database
:type schema: str
:param table: reference to a specific table in redshift database
:type table: str
:param s3_bucket: reference to a specific S3 bucket
:type s3_bucket: str
:param s3_key: reference to a specific S3 key
:type s3_key: str
:param redshift_conn_id: reference to a specific redshift database
:type redshift_conn_id: str
:param aws_conn_id: reference to a specific S3 connection
:type aws_conn_id: str
:param verify: Whether or not to verify SSL certificates for S3 connection.
By default SSL certificates are verified.
You can provide the following values:
- ``False``: do not validate SSL certificates. SSL will still be used
(unless use_ssl is False), but SSL certificates will not be
verified.
- ``path/to/cert/bundle.pem``: A filename of the CA cert bundle to uses.
You can specify this argument if you want to use a different
CA cert bundle than the one used by botocore.
:type verify: bool or str
:param copy_options: reference to a list of COPY options
:type copy_options: list
"""
@apply_defaults
def __init__(
self,
schema,
table,
s3_bucket,
s3_key,
redshift_conn_id='redshift_default',
aws_conn_id='aws_default',
verify=None,
copy_options=tuple(),
autocommit=False,
parameters=None,
*args, **kwargs):
super(S3ToRedshiftTransfer, self).__init__(*args, **kwargs)
self.schema = schema
self.table = table
self.s3_bucket = s3_bucket
self.s3_key = s3_key
self.redshift_conn_id = redshift_conn_id
self.aws_conn_id = aws_conn_id
self.verify = verify
self.copy_options = copy_options
self.autocommit = autocommit
self.parameters = parameters
[docs] def execute(self, context):
self.hook = PostgresHook(postgres_conn_id=self.redshift_conn_id)
self.s3 = S3Hook(aws_conn_id=self.aws_conn_id, verify=self.verify)
credentials = self.s3.get_credentials()
copy_options = '\n\t\t\t'.join(self.copy_options)
copy_query = """
COPY {schema}.{table}
FROM 's3://{s3_bucket}/{s3_key}/{table}'
with credentials
'aws_access_key_id={access_key};aws_secret_access_key={secret_key}'
{copy_options};
""".format(schema=self.schema,
table=self.table,
s3_bucket=self.s3_bucket,
s3_key=self.s3_key,
access_key=credentials.access_key,
secret_key=credentials.secret_key,
copy_options=copy_options)
self.log.info('Executing COPY command...')
self.hook.run(copy_query, self.autocommit)
self.log.info("COPY command complete...")