`tsdat.io.storage`¶

Module Contents¶

Classes¶

`DatastreamStorage`	DatastreamStorage is the base class for providing
`DisposableLocalTempFile`	DisposableLocalTempFile is a context manager wrapper class for a temp file on
`DisposableLocalTempFileList`	Provides a context manager wrapper class for a list of
`DisposableStorageTempFileList`	Provides is a context manager wrapper class for a list of
`TemporaryStorage`	Each DatastreamStorage should contain a corresponding

Functions¶

`_is_image`(x)
`_is_raw`(x)

tsdat.io.storage._is_image(x)¶

tsdat.io.storage._is_raw(x)¶

class tsdat.io.storage.DatastreamStorage(parameters: Union[Dict, None] = None)¶

Bases: abc.ABC

DatastreamStorage is the base class for providing access to processed data files in a persistent archive. DatastreamStorage provides shortcut methods to find files based upon date, datastream name, file type, etc. This is the class that should be used to save and retrieve processed data files. Use the DatastreamStorage.from_config() method to construct the appropriate subclass instance based upon a storage config file.

default_file_type¶

file_filters¶

output_file_extensions¶

static from_config(storage_config_file: str)¶

Load a yaml config file which provides the storage constructor parameters.

Parameters: storage_config_file (str) – The path to the config file to load
Returns: A subclass instance created from the config file.
Return type: DatastreamStorage

property tmp(self)¶

Each subclass should define the tmp property, which provides access to a TemporaryStorage object that is used to efficiently handle reading/writing temporary files used during the processing pipeline, or to perform fileystem actions on files other than processed datastream files that reside in the same filesystem as the DatastreamStorage. Is is not intended to be used outside of the pipeline.

Raises: NotImplementedError – [description]

abstract find(self, datastream_name: str, start_time: str, end_time: str, filetype: str = None) → List[str]¶

Finds all files of the given type from the datastream store with the given datastream_name and timestamps from start_time (inclusive) up to end_time (exclusive). Returns a list of paths to files that match the criteria.

Parameters

datastream_name (str) – The datastream_name as defined by ME Data Standards.
start_time (str) – The start time or date to start searching for data (inclusive). Should be like “20210106.000000” to search for data beginning on or after January 6th, 2021.
end_time (str) – The end time or date to stop searching for data (exclusive). Should be like “20210108.000000” to search for data ending before January 8th, 2021.
filetype (str, optional) – A file type from the DatastreamStorage.file_filters keys If no type is specified, all files will be returned. Defaults to None.

Returns

A list of paths in datastream storage in ascending order

Return type

List[str]

abstract fetch(self, datastream_name: str, start_time: str, end_time: str, local_path: str = None, filetype: int = None)¶

Fetches files from the datastream store using the datastream_name, start_time, and end_time to specify the file(s) to retrieve. If the local path is not specified, it is up to the subclass to determine where to put the retrieved file(s).

Parameters

datastream_name (str) – The datastream_name as defined by ME Data Standards.
start_time (str) – The start time or date to start searching for data (inclusive). Should be like “20210106” to search for data beginning on or after January 6th, 2021.
end_time (str) – The end time or date to stop searching for data (exclusive). Should be like “20210108” to search for data ending before January 8th, 2021.
local_path (str, optional) – The path to the directory where the data should be stored. Defaults to None.
filetype (int, optional) – A file type from the DatastreamStorage.file_filters keys If no type is specified, all files will be returned. Defaults to None.

Returns

A list of paths where the retrieved files were stored in local storage. This is a context manager class, so it this method should be called via the ‘with’ statement and all files referenced by the list will be cleaned up when it goes out of scope.

Return type

DisposableLocalTempFileList:

save(self, dataset_or_path: Union[str, xarray.Dataset], new_filename: str = None) → List[Any]¶

Saves a local file to the datastream store.

Parameters

dataset_or_path (Union[str, xr.Dataset]) – The dataset or local path to the file to save. The file should be named according to ME Data Standards naming conventions so that this method can automatically parse the datastream, date, and time from the file name.
new_filename (str, optional) – If provided, the new filename to save as. This parameter should ONLY be provided if using a local path for dataset_or_path. Must also follow ME Data Standards naming conventions. Defaults to None.

Returns

A list of paths where the saved files were stored in storage. Path type is dependent upon the specific storage subclass.

Return type

List[Any]

abstract save_local_path(self, local_path: str, new_filename: str = None) → Any¶

Given a path to a local file, save that file to the storage.

Parameters

local_path (str) – Local path to the file to save. The file should be named according to ME Data Standards naming conventions so that this method can automatically parse the datastream, date, and time from the file name.
new_filename (str, optional) – If provided, the new filename to save as. This parameter should ONLY be provided if using a local path for dataset_or_path. Must also follow ME Data Standards naming conventions. Defaults to None.

Returns

The path where this file was stored in storage. Path type is dependent upon the specific storage subclass.

Return type

Any

abstract exists(self, datastream_name: str, start_time: str, end_time: str, filetype: str = None) → bool¶

Checks if any data exists in the datastream store for the provided datastream and time range.

Parameters

datastream_name (str) – The datastream_name as defined by ME Data Standards.
start_time (str) – The start time or date to start searching for data (inclusive). Should be like “20210106” to search for data beginning on or after January 6th, 2021.
end_time (str) – The end time or date to stop searching for data (exclusive). Should be like “20210108” to search for data ending before January 8th, 2021.
filetype (str, optional) – A file type from the DatastreamStorage.file_filters keys. If none specified, all files will be checked. Defaults to None.

Returns

True if data exists, False otherwise.

Return type

bool

abstract delete(self, datastream_name: str, start_time: str, end_time: str, filetype: str = None) → None¶

Deletes datastream data in the datastream store in between the specified time range.

Parameters

datastream_name (str) – The datastream_name as defined by ME Data Standards.
start_time (str) – The start time or date to start searching for data (inclusive). Should be like “20210106” to search for data beginning on or after January 6th, 2021.
end_time (str) – The end time or date to stop searching for data (exclusive). Should be like “20210108” to search for data ending before January 8th, 2021.
filetype (str, optional) – A file type from the DatastreamStorage.file_filters keys. If no type is specified, all files will be deleted. Defaults to None.

class tsdat.io.storage.DisposableLocalTempFile(filepath: str, disposable=True)¶

DisposableLocalTempFile is a context manager wrapper class for a temp file on the LOCAL FILESYSTEM. It will ensure that the file is deleted when it goes out of scope.

Parameters

filepath (str) – Path to a local temp file that could be deleted when it goes out of scope.
disposable (bool, optional) – True if this file should be automatically deleted when it goes out of scope. Defaults to True.

__enter__(self)¶

__exit__(self, type, value, traceback)¶

class tsdat.io.storage.DisposableLocalTempFileList(filepath_list: List[str], delete_on_exception=False, disposable=True)¶

Bases: list

Provides a context manager wrapper class for a list of temp files on the LOCAL FILESYSTEM. It ensures that if specified, the files will be auto-deleted when the list goes out of scope.

Parameters

filepath_list (List[str]) – A list of local temp files
delete_on_exception (bool, optional) – Should the local temp files be deleted if an error was thrown when processing. Defaults to False.
disposable (bool, optional) – Should the local temp files be auto-deleted when they go out of scope. Defaults to True.

__enter__(self)¶

__exit__(self, type, value, traceback)¶

class tsdat.io.storage.DisposableStorageTempFileList(filepath_list: List[str], storage, disposable_files: Union[List, None] = None)¶

Bases: list

Provides is a context manager wrapper class for a list of temp files on the STORAGE FILESYSTEM. It will ensure that the specified files are deleted when the list goes out of scope.

Parameters

filepath_list (List[str]) – A list of files in temporary storage area
storage (TemporaryStorage) – The temporary storage service used to clean up temporary files.
disposable_files (list, optional) – Which of the files from the filepath_list should be auto-deleted when the list goes out of scope. Defaults to []

__enter__(self)¶

__exit__(self, type, value, traceback)¶

class tsdat.io.storage.TemporaryStorage(storage: DatastreamStorage)¶

Bases: abc.ABC

Each DatastreamStorage should contain a corresponding TemporaryStorage class which provides access to a TemporaryStorage object that is used to efficiently handle reading/writing temporary files used during the processing pipeline, or to perform fileystem actions on files other than processed datastream files that reside in the same filesystem as the DatastreamStorage.

TemporaryStorage methods return a context manager so that the created temporary files can be automatically removed when they go out of scope.

TemporaryStorage is a helper class intended to be used in the internals of pipeline implementations only. It is not meant as an external API for interacting with files in DatastreamStorage.

TODO: rename to a more intuitive name…

Parameters: storage (DatastreamStorage) – A reference to the corresponding DatastreamStorage

property local_temp_folder(self) → str¶

Default method to get a local temporary folder for use when retrieving files from temporary storage. This method should work for all filesystems, but can be overridden if needed by subclasses.

Returns: Path to local temp folder
Return type: str

clean(self)¶

Clean any extraneous files from the temp working dirs. Temp files could be in two places:

the local temp folder - used when fetching files from the store

the storage temp folder - used when extracting zip files in some stores (e.g., AWS)

This method removes the local temp folder. Child classes can extend this method to clean up their respective storage temp folders.

ignore_zip_check(self, filepath: str) → bool¶

Return true if this file should be excluded from the zip file check. We need this for Office documents, since they are actually zip files under the hood, so we don’t want to try to unzip them.

Parameters: filepath (str) – the file we are potentially extracting
Returns: whether we should check if it is a zip or not
Return type: bool

get_temp_filepath(self, filename: str = None, disposable: bool = True) → DisposableLocalTempFile ¶

Construct a filepath for a temporary file that will be located in the storage-approved local temp folder and will be deleted when it goes out of scope.

Parameters

filename (str, optional) – The filename to use for the temp file. If no filename is provided, one will be created. Defaults to None
disposable (bool, optional) – If true, then wrap in DisposableLocalTempfile so that the file will be removed when it goes out of scope. Defaults to True.

Returns

Path to the local file. The file will be automatically deleted when it goes out of scope.

Return type

DisposableLocalTempFile

create_temp_dir(self) → str¶

Create a new, temporary directory under the local tmp area managed by TemporaryStorage.

Returns: Path to the local dir.
Return type: str

abstract extract_files(self, file_path: Union[str, List[str]]) → DisposableStorageTempFileList ¶

If provided a path to an archive file, this function will extract the archive into a temp directory IN THE SAME FILESYSTEM AS THE STORAGE. This means, for example that if storage was in an s3 bucket ,then the files would be extracted to a temp dir in that s3 bucket. This is to prevent local disk limitations when running via Lambda.

If the file is not an archive, then the same file will be returned.

This method supports zip, tar, and tar.g file formats.

Parameters: file_path (Union[str, List[str]]) – The path of a file or a list of files that should be processed together, located in the same filesystem as the storage.
Returns: A list of paths to the files that were extracted. Files will be located in the temp area of the storage filesystem.
Return type: DisposableStorageTempFileList

abstract fetch(self, file_path: str, local_dir=None, disposable=True) → Union[DisposableLocalTempFile, str]¶

Fetch a file from temp storage to a local temp folder. If disposable is True, then a DisposableLocalTempFile will be returned so that it can be used with a context manager.

Parameters

file_path (str) – The path of a file located in the same filesystem as the storage.
local_dir ([type], optional) – The destination folder for the file. If not specified, it will be created int the storage-approved local temp folder. defaults to None.
disposable (bool, optional) – True if this file should be auto-deleted when it goes out of scope. Defaults to True.

Returns

If disposable, return a DisposableLocalTempFile, otherwise return the path to the local file.

Return type

Union[DisposableLocalTempFile, str]

abstract fetch_previous_file(self, datastream_name: str, start_time: str) → DisposableLocalTempFile ¶

Look in DatastreamStorage for the first processed file before the given date.

Parameters

datastream_name (str) – The datastream_name as defined by ME Data Standards.
start_time (str) – The start time or date to start searching for data (inclusive). Should be like “20210106” to search for data beginning on or after January 6th, 2021.

Returns

If a previous file was found, return the local path to the fetched file. Otherwise return None. (Return value wrapped in DisposableLocalTempFile so it can be auto-deleted if needed.)

Return type

DisposableLocalTempFile

abstract delete(self, file_path: str)¶

Remove a file from storage temp area if the file exists. If the file does not exist, this method will NOT raise an exception.

Parameters: file_path (str) – The path of a file located in the same filesystem as the storage.

tsdat.io.storage¶

Module Contents¶

Classes¶

Functions¶

`tsdat.io.storage`¶