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airflow.providers.amazon.aws.hooks.s3

Interact with AWS S3, using the boto3 library.

Module Contents

airflow.providers.amazon.aws.hooks.s3.T

airflow.providers.amazon.aws.hooks.s3.provide_bucket_name(func: T) → T

Function decorator that provides a bucket name taken from the connection

in case no bucket name has been passed to the function.

airflow.providers.amazon.aws.hooks.s3.unify_bucket_name_and_key(func: T) → T

Function decorator that unifies bucket name and key taken from the key

in case no bucket name and at least a key has been passed to the function.

class airflow.providers.amazon.aws.hooks.s3.S3Hook(*args, **kwargs)

Bases: airflow.providers.amazon.aws.hooks.base_aws.AwsBaseHook

Interact with AWS S3, using the boto3 library.

Additional arguments (such as aws_conn_id) may be specified and are passed down to the underlying AwsBaseHook.

See also

AwsBaseHook

conn_type = s3

hook_name = S3

static parse_s3_url(s3url: str)

Parses the S3 Url into a bucket name and key.

Parameters

s3url -- The S3 Url to parse.

Rtype s3url

str

Returns

the parsed bucket name and key

Return type

tuple of str

check_for_bucket(self, bucket_name: Optional[str] = None)

Check if bucket_name exists.

Parameters

bucket_name (str) -- the name of the bucket

Returns

True if it exists and False if not.

Return type

bool

get_bucket(self, bucket_name: Optional[str] = None)

Returns a boto3.S3.Bucket object

Parameters

bucket_name (str) -- the name of the bucket

Returns

the bucket object to the bucket name.

Return type

boto3.S3.Bucket

create_bucket(self, bucket_name: Optional[str] = None, region_name: Optional[str] = None)

Creates an Amazon S3 bucket.

Parameters

• bucket_name (str) -- The name of the bucket

• region_name (str) -- The name of the aws region in which to create the bucket.

check_for_prefix(self, prefix: str, delimiter: str, bucket_name: Optional[str] = None)

Checks that a prefix exists in a bucket

Parameters

• bucket_name (str) -- the name of the bucket

• prefix (str) -- a key prefix

• delimiter (str) -- the delimiter marks key hierarchy.

Returns

False if the prefix does not exist in the bucket and True if it does.

Return type

bool

list_prefixes(self, bucket_name: Optional[str] = None, prefix: Optional[str] = None, delimiter: Optional[str] = None, page_size: Optional[int] = None, max_items: Optional[int] = None)

Lists prefixes in a bucket under prefix

Parameters

• bucket_name (str) -- the name of the bucket

• prefix (str) -- a key prefix

• delimiter (str) -- the delimiter marks key hierarchy.

• page_size (int) -- pagination size

• max_items (int) -- maximum items to return

Returns

a list of matched prefixes

Return type

list

list_keys(self, bucket_name: Optional[str] = None, prefix: Optional[str] = None, delimiter: Optional[str] = None, page_size: Optional[int] = None, max_items: Optional[int] = None)

Lists keys in a bucket under prefix and not containing delimiter

Parameters

• bucket_name (str) -- the name of the bucket

• prefix (str) -- a key prefix

• delimiter (str) -- the delimiter marks key hierarchy.

• page_size (int) -- pagination size

• max_items (int) -- maximum items to return

Returns

a list of matched keys

Return type

list

check_for_key(self, key: str, bucket_name: Optional[str] = None)

Checks if a key exists in a bucket

Parameters

• key (str) -- S3 key that will point to the file

• bucket_name (str) -- Name of the bucket in which the file is stored

Returns

True if the key exists and False if not.

Return type

bool

get_key(self, key: str, bucket_name: Optional[str] = None)

Returns a boto3.s3.Object

Parameters

• key (str) -- the path to the key

• bucket_name (str) -- the name of the bucket

Returns

the key object from the bucket

Return type

boto3.s3.Object

read_key(self, key: str, bucket_name: Optional[str] = None)

Reads a key from S3

Parameters

• key (str) -- S3 key that will point to the file

• bucket_name (str) -- Name of the bucket in which the file is stored

Returns

the content of the key

Return type

str

select_key(self, key: str, bucket_name: Optional[str] = None, expression: Optional[str] = None, expression_type: Optional[str] = None, input_serialization: Optional[Dict[str, Any]] = None, output_serialization: Optional[Dict[str, Any]] = None)

Reads a key with S3 Select.

Parameters

• key (str) -- S3 key that will point to the file

• bucket_name (str) -- Name of the bucket in which the file is stored

• expression (str) -- S3 Select expression

• expression_type (str) -- S3 Select expression type

• input_serialization (dict) -- S3 Select input data serialization format

• output_serialization (dict) -- S3 Select output data serialization format

Returns

retrieved subset of original data by S3 Select

Return type

str

See also

For more details about S3 Select parameters: http://boto3.readthedocs.io/en/latest/reference/services/s3.html#S3.Client.select_object_content

check_for_wildcard_key(self, wildcard_key: str, bucket_name: Optional[str] = None, delimiter: str = '')

Checks that a key matching a wildcard expression exists in a bucket

Parameters

• wildcard_key (str) -- the path to the key

• bucket_name (str) -- the name of the bucket

• delimiter (str) -- the delimiter marks key hierarchy

Returns

True if a key exists and False if not.

Return type

bool

get_wildcard_key(self, wildcard_key: str, bucket_name: Optional[str] = None, delimiter: str = '')

Returns a boto3.s3.Object object matching the wildcard expression

Parameters

• wildcard_key (str) -- the path to the key

• bucket_name (str) -- the name of the bucket

• delimiter (str) -- the delimiter marks key hierarchy

Returns

the key object from the bucket or None if none has been found.

Return type

boto3.s3.Object

load_file(self, filename: str, key: str, bucket_name: Optional[str] = None, replace: bool = False, encrypt: bool = False, gzip: bool = False, acl_policy: Optional[str] = None)

Loads a local file to S3

Parameters

• filename (str) -- name of the file to load.

• key (str) -- S3 key that will point to the file

• bucket_name (str) -- Name of the bucket in which to store the file

• replace (bool) -- A flag to decide whether or not to overwrite the key if it already exists. If replace is False and the key exists, an error will be raised.

• encrypt (bool) -- If True, the file will be encrypted on the server-side by S3 and will be stored in an encrypted form while at rest in S3.

• gzip (bool) -- If True, the file will be compressed locally

• acl_policy (str) -- String specifying the canned ACL policy for the file being uploaded to the S3 bucket.

load_string(self, string_data: str, key: str, bucket_name: Optional[str] = None, replace: bool = False, encrypt: bool = False, encoding: Optional[str] = None, acl_policy: Optional[str] = None)

Loads a string to S3

This is provided as a convenience to drop a string in S3. It uses the boto infrastructure to ship a file to s3.

Parameters

• string_data (str) -- str to set as content for the key.

• key (str) -- S3 key that will point to the file

• bucket_name (str) -- Name of the bucket in which to store the file

• replace (bool) -- A flag to decide whether or not to overwrite the key if it already exists

• encrypt (bool) -- If True, the file will be encrypted on the server-side by S3 and will be stored in an encrypted form while at rest in S3.

• encoding (str) -- The string to byte encoding

• acl_policy (str) -- The string to specify the canned ACL policy for the object to be uploaded

load_bytes(self, bytes_data: bytes, key: str, bucket_name: Optional[str] = None, replace: bool = False, encrypt: bool = False, acl_policy: Optional[str] = None)

Loads bytes to S3

This is provided as a convenience to drop a string in S3. It uses the boto infrastructure to ship a file to s3.

Parameters

• bytes_data (bytes) -- bytes to set as content for the key.

• key (str) -- S3 key that will point to the file

• bucket_name (str) -- Name of the bucket in which to store the file

• replace (bool) -- A flag to decide whether or not to overwrite the key if it already exists

• encrypt (bool) -- If True, the file will be encrypted on the server-side by S3 and will be stored in an encrypted form while at rest in S3.

• acl_policy (str) -- The string to specify the canned ACL policy for the object to be uploaded

load_file_obj(self, file_obj: BytesIO, key: str, bucket_name: Optional[str] = None, replace: bool = False, encrypt: bool = False, acl_policy: Optional[str] = None)

Loads a file object to S3

Parameters

• file_obj (file-like object) -- The file-like object to set as the content for the S3 key.

• key (str) -- S3 key that will point to the file

• bucket_name (str) -- Name of the bucket in which to store the file

• replace (bool) -- A flag that indicates whether to overwrite the key if it already exists.

• encrypt (bool) -- If True, S3 encrypts the file on the server, and the file is stored in encrypted form at rest in S3.

• acl_policy (str) -- The string to specify the canned ACL policy for the object to be uploaded

_upload_file_obj(self, file_obj: BytesIO, key: str, bucket_name: Optional[str] = None, replace: bool = False, encrypt: bool = False, acl_policy: Optional[str] = None)

copy_object(self, source_bucket_key: str, dest_bucket_key: str, source_bucket_name: Optional[str] = None, dest_bucket_name: Optional[str] = None, source_version_id: Optional[str] = None, acl_policy: Optional[str] = None)

Creates a copy of an object that is already stored in S3.

Note: the S3 connection used here needs to have access to both source and destination bucket/key.

Parameters

• source_bucket_key (str) --

  The key of the source object.

  It can be either full s3:// style url or relative path from root level.

  When it's specified as a full s3:// url, please omit source_bucket_name.

• dest_bucket_key (str) --

  The key of the object to copy to.

  The convention to specify dest_bucket_key is the same as source_bucket_key.

• source_bucket_name (str) --

  Name of the S3 bucket where the source object is in.

  It should be omitted when source_bucket_key is provided as a full s3:// url.

• dest_bucket_name (str) --

  Name of the S3 bucket to where the object is copied.

  It should be omitted when dest_bucket_key is provided as a full s3:// url.

• source_version_id (str) -- Version ID of the source object (OPTIONAL)

• acl_policy (str) -- The string to specify the canned ACL policy for the object to be copied which is private by default.

delete_bucket(self, bucket_name: str, force_delete: bool = False)

To delete s3 bucket, delete all s3 bucket objects and then delete the bucket.

Parameters

• bucket_name (str) -- Bucket name

• force_delete (bool) -- Enable this to delete bucket even if not empty

Returns

None

Return type

None

delete_objects(self, bucket: str, keys: Union[str, list])

Delete keys from the bucket.

Parameters

• bucket (str) -- Name of the bucket in which you are going to delete object(s)

• keys (str or list) --

  The key(s) to delete from S3 bucket.

  When keys is a string, it's supposed to be the key name of the single object to delete.

  When keys is a list, it's supposed to be the list of the keys to delete.

download_file(self, key: str, bucket_name: Optional[str] = None, local_path: Optional[str] = None)

Downloads a file from the S3 location to the local file system.

Parameters

• key (str) -- The key path in S3.

• bucket_name (Optional[str]) -- The specific bucket to use.

• local_path (Optional[str]) -- The local path to the downloaded file. If no path is provided it will use the system's temporary directory.

Returns

the file name.

Return type

str

generate_presigned_url(self, client_method: str, params: Optional[dict] = None, expires_in: int = 3600, http_method: Optional[str] = None)

Generate a presigned url given a client, its method, and arguments

Parameters

• client_method (str) -- The client method to presign for.

• params (dict) -- The parameters normally passed to ClientMethod.

• expires_in (int) -- The number of seconds the presigned url is valid for. By default it expires in an hour (3600 seconds).

• http_method (str) -- The http method to use on the generated url. By default, the http method is whatever is used in the method's model.

Returns

The presigned url.

Return type

str

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