quilt3.Package

Package(self)

In-memory representation of a package

manifest

Provides a generator of the dicts that make up the serialized package.

top_hash

Returns the top hash of the package.

Note that physical keys are not hashed because the package has the same semantics regardless of where the bytes come from.

Returns

A string that represents the top hash of the package

Package.__repr__(self, max_lines=20)

String representation of the Package.

Package.install(name, registry=None, top_hash=None, dest=None, dest_registry=None)

Installs a named package to the local registry and downloads its files.

Arguments

• name(str): Name of package to install.

• registry(str): Registry where package is located.

  Defaults to the default remote registry.

• top_hash(str): Hash of package to install. Defaults to latest.

• dest(str): Local path to download files to.

• dest_registry(str): Registry to install package to. Defaults to local registry.

Returns

A new Package that points to files on your local machine.

Package.resolve_hash(registry, hash_prefix)

Find a hash that starts with a given prefix. Arguments

• registry(string): location of registry

• hash_prefix(string): hash prefix with length between 6 and 64 characters

Package.browse(name, registry=None, top_hash=None)

Load a package into memory from a registry without making a local copy of the manifest. Arguments

• name(string): name of package to load

• registry(string): location of registry to load package from

• top_hash(string): top hash of package version to load

Package.__contains__(self, logical_key)

Checks whether the package contains a specified logical_key.

Returns

True or False

Package.__getitem__(self, logical_key)

Filters the package based on prefix, and returns either a new Package or a PackageEntry.

Arguments

• prefix(str): prefix to filter on

Returns

PackageEntry if prefix matches a logical_key exactly otherwise Package

Package.fetch(self, dest='./')

Copy all descendants to dest. Descendants are written under their logical names relative to self.

Arguments

• dest: where to put the files (locally)

Returns

None

Package.keys(self)

Returns logical keys in the package.

Package.walk(self)

Generator that traverses all entries in the package tree and returns tuples of (key, entry), with keys in alphabetical order.

Package.load(readable_file)

Loads a package from a readable file-like object.

Arguments

• readable_file: readable file-like object to deserialize package from

Returns

A new Package object

Raises

file not found json decode error invalid package exception

Package.set_dir(self, lkey, path=None, meta=None)

Adds all files from path to the package.

Recursively enumerates every file in path, and adds them to the package according to their relative location to path.

Arguments

• lkey(string): prefix to add to every logical key,

  use '/' for the root of the package.

• path(string): path to scan for files to add to package.

  If None, lkey will be substituted in as the path.

• meta(dict): user level metadata dict to attach to lkey directory entry.

Returns

self

Raises

When path doesn't exist

Package.get(self, logical_key)

Gets object from logical_key and returns its physical path. Equivalent to self[logical_key].get().

Arguments

• logical_key(string): logical key of the object to get

Returns

Physical path as a string.

Raises

• KeyError: when logical_key is not present in the package

• ValueError: if the logical_key points to a Package rather than PackageEntry.

Package.readme(self)

Returns the README PackageEntry

The README is the entry with the logical key 'README.md' (case-sensitive). Will raise a QuiltException if no such entry exists.

Package.set_meta(self, meta)

Sets user metadata on this Package.

Package.build(self, name, registry=None, message=None)

Serializes this package to a registry.

Arguments

• name: optional name for package

• registry: registry to build to

    defaults to local registry

• message: the commit message of the package

Returns

The top hash as a string.

Package.dump(self, writable_file)

Serializes this package to a writable file-like object.

Arguments

• writable_file: file-like object to write serialized package.

Returns

None

Raises

fail to create file fail to finish write

Package.set(self, logical_key, entry=None, meta=None, serialization_location=None, serialization_format_opts=None)

Returns self with the object at logical_key set to entry.

Arguments

• logical_key(string): logical key to update

• entry(PackageEntry OR string OR object): new entry to place at logical_key in the package.

  If entry is a string, it is treated as a URL, and an entry is created based on it.

  If entry is None, the logical key string will be substituted as the entry value.

  If entry is an object and quilt knows how to serialize it, it will immediately be serialized and written

  to disk, either to serialization_location or to a location managed by quilt. List of types that Quilt

  can serialize is available by calling quilt3.formats.FormatRegistry.all_supported_formats()

• meta(dict): user level metadata dict to attach to entry

• serialization_format_opts(dict): Optional. If passed in, only used if entry is an object. Options to help

  Quilt understand how the object should be serialized. Useful for underspecified file formats like csv

  when content contains confusing characters. Will be passed as kwargs to the FormatHandler.serialize()

  function. See docstrings for individual FormatHandlers for full list of options -

• https: //github.com/quiltdata/quilt/blob/master/api/python/quilt3/formats.py

• serialization_location(string): Optional. If passed in, only used if entry is an object. Where the

  serialized object should be written, e.g. "./mydataframe.parquet"

Returns

self

Package.delete(self, logical_key)

Returns the package with logical_key removed.

Returns

self

Raises

• KeyError: when logical_key is not present to be deleted

Package.push(self, name, registry=None, dest=None, message=None, selector_fn= at 0x10d02aa70>)

Copies objects to path, then creates a new package that points to those objects. Copies each object in this package to path according to logical key structure, then adds to the registry a serialized version of this package with physical keys that point to the new copies.

Note that push is careful to not push data unnecessarily. To illustrate, imagine you have a PackageEntry: pkg["entry_1"].physical_key = "/tmp/package_entry_1.json"

If that entry would be pushed to s3://bucket/prefix/entry_1.json, but s3://bucket/prefix/entry_1.json already contains the exact same bytes as '/tmp/package_entry_1.json', quilt3 will not push the bytes to s3, no matter what selector_fn('entry_1', pkg["entry_1"]) returns.

However, selector_fn will dictate whether the new package points to the local file or to s3:

If selector_fn('entry_1', pkg["entry_1"]) == False, new_pkg["entry_1"] = ["/tmp/package_entry_1.json"]

If selector_fn('entry_1', pkg["entry_1"]) == True, new_pkg["entry_1"] = ["s3://bucket/prefix/entry_1.json"]

Arguments

• name: name for package in registry

• dest: where to copy the objects in the package

• registry: registry where to create the new package

• message: the commit message for the new package

• selector_fn: An optional function that determines which package entries should be copied to S3. The function

         takes in two arguments, logical_key and package_entry, and should return False if that
         PackageEntry should be skipped during push. If for example you have a package where the files
         are spread over multiple buckets and you add a single local file, you can use selector_fn to
         only push the local file to s3 (instead of pushing all data to the destination bucket).

Returns

A new package that points to the copied objects.

Package.rollback(name, registry, top_hash)

Set the "latest" version to the given hash.

Arguments

• name(str): Name of package to rollback.

• registry(str): Registry where package is located.

• top_hash(str): Hash to rollback to.

Package.diff(self, other_pkg)

Returns three lists -- added, modified, deleted.

Added: present in other_pkg but not in self. Modified: present in both, but different. Deleted: present in self, but not other_pkg.

Arguments

• other_pkg: Package to diff

Returns

added, modified, deleted (all lists of logical keys)

Package.map(self, f, include_directories=False)

Performs a user-specified operation on each entry in the package.

Arguments

• f(x, y): function

  The function to be applied to each package entry.

  It should take two inputs, a logical key and a PackageEntry.

• include_directories: bool

  Whether or not to include directory entries in the map.

Returns: list The list of results generated by the map.

Package.filter(self, f, include_directories=False)

Applies a user-specified operation to each entry in the package, removing results that evaluate to False from the output.

Arguments

• f(x, y): function

  The function to be applied to each package entry.

  It should take two inputs, a logical key and a PackageEntry.

  This function should return a boolean.

• include_directories: bool

  Whether or not to include directory entries in the map.

Returns

A new package with entries that evaluated to False removed

Package.verify(self, src, extra_files_ok=False)

Check if the contents of the given directory matches the package manifest.

Arguments

• src(str): URL of the directory

• extra_files_ok(bool): Whether extra files in the directory should cause a failure.

  Returns

True if the package matches the directory; False otherwise.

PackageEntry(self, physical_key, size, hash_obj, meta)

Represents an entry at a logical key inside a package.

__init__

Creates an entry.

Arguments

• physical_key: a URI (either s3:// or file://)

• size(number): size of object in bytes

• hash({'type': string, 'value': string}): hash object

• for example: {'type': 'SHA256', 'value': 'bb08a...'}

• meta(dict): metadata dictionary

Returns

a PackageEntry

slots

Built-in mutable sequence.

If no argument is given, the constructor creates a new empty list. The argument must be an iterable if specified.

physical_keys

Deprecated

PackageEntry.as_dict(self)

Returns dict representation of entry.

PackageEntry.set_meta(self, meta)

Sets the user_meta for this PackageEntry.

PackageEntry.set(self, path=None, meta=None)

Returns self with the physical key set to path.

Arguments

• logical_key(string): logical key to update

• path(string): new path to place at logical_key in the package

  Currently only supports a path on local disk

• meta(dict): metadata dict to attach to entry. If meta is provided, set just

  updates the meta attached to logical_key without changing anything

  else in the entry

Returns

self

PackageEntry.get(self)

Returns the physical key of this PackageEntry.

PackageEntry.get_cached_path(self)

Returns a locally cached physical key, if available.

PackageEntry.get_bytes(self, use_cache_if_available=True)

Returns the bytes of the object this entry corresponds to. If 'use_cache_if_available'=True, will first try to retrieve the bytes from cache.

PackageEntry.get_as_json(self, use_cache_if_available=True)

Returns a JSON file as a dict. Assumes that the file is encoded using utf-8.

If 'use_cache_if_available'=True, will first try to retrieve the object from cache.

PackageEntry.get_as_string(self, use_cache_if_available=True)

Return the object as a string. Assumes that the file is encoded using utf-8.

If 'use_cache_if_available'=True, will first try to retrieve the object from cache.

PackageEntry.deserialize(self, func=None, **format_opts)

Returns the object this entry corresponds to.

Arguments

• func: Skip normal deserialization process, and call func(bytes),

  returning the result directly.

• **format_opts: Some data formats may take options. Though

  normally handled by metadata, these can be overridden here.

  Returns

The deserialized object from the logical_key

Raises

physical key failure hash verification fail when deserialization metadata is not present

PackageEntry.fetch(self, dest=None)

Gets objects from entry and saves them to dest.

Arguments

• dest: where to put the files

  Defaults to the entry name

Returns

None

PackageEntry.__call__(self, func=None, **kwargs)

Shorthand for self.deserialize()