Source code for airflow.providers.snowflake.transfers.s3_to_snowflake

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"""This module contains AWS S3 to Snowflake operator."""
from typing import Any, Optional, Sequence

from airflow.models import BaseOperator
from airflow.providers.snowflake.hooks.snowflake import SnowflakeHook
from airflow.providers.snowflake.utils.common import enclose_param


[docs]class S3ToSnowflakeOperator(BaseOperator):
    """
    Executes an COPY command to load files from s3 to Snowflake

    .. seealso::
        For more information on how to use this operator, take a look at the guide:
        :ref:`howto/operator:S3ToSnowflakeOperator`

    :param s3_keys: reference to a list of S3 keys
    :param table: reference to a specific table in snowflake database
    :param schema: name of schema (will overwrite schema defined in
        connection)
    :param stage: reference to a specific snowflake stage. If the stage's schema is not the same as the
        table one, it must be specified
    :param prefix: cloud storage location specified to limit the set of files to load
    :param file_format: reference to a specific file format
    :param warehouse: name of warehouse (will overwrite any warehouse
        defined in the connection's extra JSON)
    :param database: reference to a specific database in Snowflake connection
    :param columns_array: reference to a specific columns array in snowflake database
    :param pattern: regular expression pattern string specifying the file names and/or paths to match.
        Note: regular expression will be automatically enclose in single quotes
        and all single quotes in expression will replace by two single quotes.
    :param snowflake_conn_id: Reference to
        :ref:`Snowflake connection id<howto/connection:snowflake>`
    :param role: name of role (will overwrite any role defined in
        connection's extra JSON)
    :param authenticator: authenticator for Snowflake.
        'snowflake' (default) to use the internal Snowflake authenticator
        'externalbrowser' to authenticate using your web browser and
        Okta, ADFS or any other SAML 2.0-compliant identify provider
        (IdP) that has been defined for your account
        'https://<your_okta_account_name>.okta.com' to authenticate
        through native Okta.
    :param session_parameters: You can set session-level parameters at
        the time you connect to Snowflake
    """

[docs]    template_fields: Sequence[str] = ("s3_keys",)
[docs]    template_fields_renderers = {"s3_keys": "json"}

    def __init__(
        self,
        *,
        s3_keys: Optional[list] = None,
        table: str,
        stage: str,
        prefix: Optional[str] = None,
        file_format: str,
        schema: Optional[str] = None,
        columns_array: Optional[list] = None,
        pattern: Optional[str] = None,
        warehouse: Optional[str] = None,
        database: Optional[str] = None,
        autocommit: bool = True,
        snowflake_conn_id: str = 'snowflake_default',
        role: Optional[str] = None,
        authenticator: Optional[str] = None,
        session_parameters: Optional[dict] = None,
        **kwargs,
    ) -> None:
        super().__init__(**kwargs)
        self.s3_keys = s3_keys
        self.table = table
        self.warehouse = warehouse
        self.database = database
        self.stage = stage
        self.prefix = prefix
        self.file_format = file_format
        self.schema = schema
        self.columns_array = columns_array
        self.pattern = pattern
        self.autocommit = autocommit
        self.snowflake_conn_id = snowflake_conn_id
        self.role = role
        self.authenticator = authenticator
        self.session_parameters = session_parameters

[docs]    def execute(self, context: Any) -> None:
        snowflake_hook = SnowflakeHook(
            snowflake_conn_id=self.snowflake_conn_id,
            warehouse=self.warehouse,
            database=self.database,
            role=self.role,
            schema=self.schema,
            authenticator=self.authenticator,
            session_parameters=self.session_parameters,
        )

        if self.schema:
            into = f"{self.schema}.{self.table}"
        else:
            into = self.table
        if self.columns_array:
            into = f"{into}({','.join(self.columns_array)})"

        sql_parts = [
            f"COPY INTO {into}",
            f"FROM @{self.stage}/{self.prefix or ''}",
        ]
        if self.s3_keys:
            files = ", ".join(map(enclose_param, self.s3_keys))
            sql_parts.append(f"files=({files})")
        sql_parts.append(f"file_format={self.file_format}")
        if self.pattern:
            sql_parts.append(f"pattern={enclose_param(self.pattern)}")
        copy_query = "\n".join(sql_parts)

        self.log.info('Executing COPY command...')
        snowflake_hook.run(copy_query, self.autocommit)
        self.log.info("COPY command completed")