swh.model.model module

Implementation of Software Heritage’s data model

See Data model for an overview of the data model.

The classes defined in this module are immutable attrs objects and enums.

All classes define a from_dict class method and a to_dict method to convert between them and msgpack-serializable objects.

exception swh.model.model.MissingData

Bases: Exception

Raised by Content.with_data when it has no way of fetching the data (but not when fetching the data fails).

swh.model.model.KeyType

The type returned by BaseModel.unique_key().

alias of Union[Dict[str, str], Dict[str, bytes], bytes]

swh.model.model.freeze_optional_dict(d: Union[None, Dict[swh.model.model.KT, swh.model.model.VT], swh.model.collections.ImmutableDict[swh.model.model.KT, swh.model.model.VT]]) → Optional[swh.model.collections.ImmutableDict[swh.model.model.KT, swh.model.model.VT]]

swh.model.model.dictify(value)

Helper function used by BaseModel.to_dict()

class swh.model.model.BaseModel

Bases: object

Base class for SWH model classes.

Provides serialization/deserialization to/from Python dictionaries, that are suitable for JSON/msgpack-like formats.

to_dict()

Wrapper of attr.asdict that can be overridden by subclasses that have special handling of some of the fields.

classmethod from_dict(d)

Takes a dictionary representing a tree of SWH objects, and recursively builds the corresponding objects.

anonymize() → Optional[swh.model.model.ModelType]

Returns an anonymized version of the object, if needed.

If the object model does not need/support anonymization, returns None.

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

Returns a unique key for this object, that can be used for deduplication.

class swh.model.model.HashableObject

Bases: object

Mixin to automatically compute object identifier hash when the associated model is instantiated.

id: bytes

abstract compute_hash() → bytes

Derived model classes must implement this to compute the object hash.

This method is called by the object initialization if the id attribute is set to an empty value.

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

class swh.model.model.Person(fullname: bytes, name: Optional[bytes], email: Optional[bytes])

Bases: swh.model.model.BaseModel

Represents the author/committer of a revision or release.

Method generated by attrs for class Person.

object_type: typing_extensions.Final = 'person'

fullname

name

email

classmethod from_fullname(fullname: bytes)

Returns a Person object, by guessing the name and email from the fullname, in the name <email> format.

The fullname is left unchanged.

anonymize() → swh.model.model.Person

Returns an anonymized version of the Person object.

Anonymization is simply a Person which fullname is the hashed, with unset name or email.

classmethod from_dict(d)

If the fullname is missing, construct a fullname using the following heuristics: if the name value is None, we return the email in angle brackets, else, we return the name, a space, and the email in angle brackets.

class swh.model.model.Timestamp(seconds: int, microseconds: int)

Bases: swh.model.model.BaseModel

Represents a naive timestamp from a VCS.

Method generated by attrs for class Timestamp.

object_type: typing_extensions.Final = 'timestamp'

seconds

microseconds

check_seconds(attribute, value)

Check that seconds fit in a 64-bits signed integer.

check_microseconds(attribute, value)

Checks that microseconds are positive and < 1000000.

class swh.model.model.TimestampWithTimezone(timestamp: swh.model.model.Timestamp, offset: int, negative_utc: bool)

Bases: swh.model.model.BaseModel

Represents a TZ-aware timestamp from a VCS.

Method generated by attrs for class TimestampWithTimezone.

object_type: typing_extensions.Final = 'timestamp_with_timezone'

timestamp

offset

negative_utc

check_offset(attribute, value)

Checks the offset is a 16-bits signed integer (in theory, it should always be between -14 and +14 hours).

check_negative_utc(attribute, value)

classmethod from_dict(time_representation: Union[Dict, datetime.datetime, int])

Builds a TimestampWithTimezone from any of the formats accepted by swh.model.normalize_timestamp().

classmethod from_datetime(dt: datetime.datetime)

to_datetime() → datetime.datetime

Convert to a datetime (with a timezone set to the recorded fixed UTC offset)

Beware that this conversion can be lossy: the negative_utc flag is not taken into consideration (since it cannot be represented in a datetime). Also note that it may fail due to type overflow.

classmethod from_iso8601(s)

Builds a TimestampWithTimezone from an ISO8601-formatted string.

class swh.model.model.Origin(url: str, id: bytes = b'')

Bases: swh.model.model.HashableObject, swh.model.model.BaseModel

Represents a software source: a VCS and an URL.

Method generated by attrs for class Origin.

object_type: typing_extensions.Final = 'origin'

url

id

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

Returns a unique key for this object, that can be used for deduplication.

compute_hash() → bytes

Derived model classes must implement this to compute the object hash.

This method is called by the object initialization if the id attribute is set to an empty value.

swhid() → swh.model.swhids.ExtendedSWHID

Returns a SWHID representing this origin.

class swh.model.model.OriginVisit(origin: str, date: datetime.datetime, type: str, visit: Optional[int] = None)

Bases: swh.model.model.BaseModel

Represents an origin visit with a given type at a given point in time, by a SWH loader.

Method generated by attrs for class OriginVisit.

object_type: typing_extensions.Final = 'origin_visit'

origin

date

type

Should not be set before calling ‘origin_visit_add()’.

visit

check_date(attribute, value)

Checks the date has a timezone.

to_dict()

Serializes the date as a string and omits the visit id if it is None.

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

Returns a unique key for this object, that can be used for deduplication.

class swh.model.model.OriginVisitStatus(origin: str, visit: int, date: datetime.datetime, status: str, snapshot: Optional[bytes], type: Optional[str] = None, metadata: Union[None, Dict[swh.model.model.KT, swh.model.model.VT], swh.model.collections.ImmutableDict[swh.model.model.KT, swh.model.model.VT]] = None)

Bases: swh.model.model.BaseModel

Represents a visit update of an origin at a given point in time.

Method generated by attrs for class OriginVisitStatus.

object_type: typing_extensions.Final = 'origin_visit_status'

origin

visit

date

status

snapshot

type

metadata

check_date(attribute, value)

Checks the date has a timezone.

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

Returns a unique key for this object, that can be used for deduplication.

class swh.model.model.TargetType(value)

Bases: enum.Enum

The type of content pointed to by a snapshot branch. Usually a revision or an alias.

CONTENT = 'content'

DIRECTORY = 'directory'

REVISION = 'revision'

RELEASE = 'release'

SNAPSHOT = 'snapshot'

ALIAS = 'alias'

class swh.model.model.ObjectType(value)

Bases: enum.Enum

The type of content pointed to by a release. Usually a revision

CONTENT = 'content'

DIRECTORY = 'directory'

REVISION = 'revision'

RELEASE = 'release'

SNAPSHOT = 'snapshot'

class swh.model.model.SnapshotBranch(target: bytes, target_type: swh.model.model.TargetType)

Bases: swh.model.model.BaseModel

Represents one of the branches of a snapshot.

Method generated by attrs for class SnapshotBranch.

object_type: typing_extensions.Final = 'snapshot_branch'

target

target_type

check_target(attribute, value)

Checks the target type is not an alias, checks the target is a valid sha1_git.

classmethod from_dict(d)

class swh.model.model.Snapshot(branches: Union[None, Dict[swh.model.model.KT, swh.model.model.VT], swh.model.collections.ImmutableDict[swh.model.model.KT, swh.model.model.VT]], id: bytes = b'')

Bases: swh.model.model.HashableObject, swh.model.model.BaseModel

Represents the full state of an origin at a given point in time.

Method generated by attrs for class Snapshot.

object_type: typing_extensions.Final = 'snapshot'

branches

id

compute_hash() → bytes

Derived model classes must implement this to compute the object hash.

This method is called by the object initialization if the id attribute is set to an empty value.

classmethod from_dict(d)

swhid() → swh.model.swhids.CoreSWHID

Returns a SWHID representing this object.

class swh.model.model.Release(name: bytes, message: Optional[bytes], target: Optional[bytes], target_type: swh.model.model.ObjectType, synthetic: bool, author: Optional[swh.model.model.Person] = None, date: Optional[swh.model.model.TimestampWithTimezone] = None, metadata: Union[None, Dict[swh.model.model.KT, swh.model.model.VT], swh.model.collections.ImmutableDict[swh.model.model.KT, swh.model.model.VT]] = None, id: bytes = b'')

Bases: swh.model.model.HashableObject, swh.model.model.BaseModel

Method generated by attrs for class Release.

object_type: typing_extensions.Final = 'release'

name

message

target

target_type

synthetic

author

date

metadata

id

compute_hash() → bytes

Derived model classes must implement this to compute the object hash.

This method is called by the object initialization if the id attribute is set to an empty value.

check_author(attribute, value)

If the author is None, checks the date is None too.

to_dict()

Wrapper of attr.asdict that can be overridden by subclasses that have special handling of some of the fields.

classmethod from_dict(d)

swhid() → swh.model.swhids.CoreSWHID

Returns a SWHID representing this object.

anonymize() → swh.model.model.Release

Returns an anonymized version of the Release object.

Anonymization consists in replacing the author with an anonymized Person object.

class swh.model.model.RevisionType(value)

Bases: enum.Enum

An enumeration.

GIT = 'git'

TAR = 'tar'

DSC = 'dsc'

SUBVERSION = 'svn'

MERCURIAL = 'hg'

CVS = 'cvs'

BAZAAR = 'bzr'

swh.model.model.tuplify_extra_headers(value: Iterable)

class swh.model.model.Revision(message: Optional[bytes], author: swh.model.model.Person, committer: swh.model.model.Person, date: Optional[swh.model.model.TimestampWithTimezone], committer_date: Optional[swh.model.model.TimestampWithTimezone], type: swh.model.model.RevisionType, directory: bytes, synthetic: bool, metadata: Union[None, Dict[swh.model.model.KT, swh.model.model.VT], swh.model.collections.ImmutableDict[swh.model.model.KT, swh.model.model.VT]] = None, parents: Tuple[bytes, ...] = (), id: bytes = b'', extra_headers: Iterable = ())

Bases: swh.model.model.HashableObject, swh.model.model.BaseModel

Method generated by attrs for class Revision.

object_type: typing_extensions.Final = 'revision'

message

author

committer

date

committer_date

type

directory

synthetic

metadata

parents

id

extra_headers

compute_hash() → bytes

Derived model classes must implement this to compute the object hash.

This method is called by the object initialization if the id attribute is set to an empty value.

classmethod from_dict(d)

swhid() → swh.model.swhids.CoreSWHID

Returns a SWHID representing this object.

anonymize() → swh.model.model.Revision

Returns an anonymized version of the Revision object.

Anonymization consists in replacing the author and committer with an anonymized Person object.

class swh.model.model.DirectoryEntry(name: bytes, type: str, target: bytes, perms: int)

Bases: swh.model.model.BaseModel

Method generated by attrs for class DirectoryEntry.

object_type: typing_extensions.Final = 'directory_entry'

name

type

target

perms

Usually one of the values of swh.model.from_disk.DentryPerms.

class swh.model.model.Directory(entries: Tuple[swh.model.model.DirectoryEntry, ...], id: bytes = b'')

Bases: swh.model.model.HashableObject, swh.model.model.BaseModel

Method generated by attrs for class Directory.

object_type: typing_extensions.Final = 'directory'

entries

id

compute_hash() → bytes

Derived model classes must implement this to compute the object hash.

This method is called by the object initialization if the id attribute is set to an empty value.

classmethod from_dict(d)

swhid() → swh.model.swhids.CoreSWHID

Returns a SWHID representing this object.

class swh.model.model.BaseContent(status: str)

Bases: swh.model.model.BaseModel

Method generated by attrs for class BaseContent.

status

classmethod from_dict(d, use_subclass=True)

get_hash(hash_name)

hashes() → Dict[str, bytes]

Returns a dictionary {hash_name: hash_value}

class swh.model.model.Content(sha1: bytes, sha1_git: bytes, sha256: bytes, blake2s256: bytes, length: int, status: str = 'visible', data: Optional[bytes] = None, ctime: Optional[datetime.datetime] = None)

Bases: swh.model.model.BaseContent

Method generated by attrs for class Content.

object_type: typing_extensions.Final = 'content'

sha1

sha1_git

sha256

blake2s256

length

status

data

ctime

check_length(attribute, value)

Checks the length is positive.

check_ctime(attribute, value)

Checks the ctime has a timezone.

to_dict()

Wrapper of attr.asdict that can be overridden by subclasses that have special handling of some of the fields.

classmethod from_data(data, status='visible', ctime=None) → swh.model.model.Content

Generate a Content from a given data byte string.

This populates the Content with the hashes and length for the data passed as argument, as well as the data itself.

classmethod from_dict(d)

with_data() → swh.model.model.Content

Loads the data attribute; meaning that it is guaranteed not to be None after this call.

This call is almost a no-op, but subclasses may overload this method to lazy-load data (eg. from disk or objstorage).

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

Returns a unique key for this object, that can be used for deduplication.

swhid() → swh.model.swhids.CoreSWHID

Returns a SWHID representing this object.

class swh.model.model.SkippedContent(sha1: Optional[bytes], sha1_git: Optional[bytes], sha256: Optional[bytes], blake2s256: Optional[bytes], length: Optional[int], status: str, reason: Optional[str] = None, origin: Optional[str] = None, ctime: Optional[datetime.datetime] = None)

Bases: swh.model.model.BaseContent

Method generated by attrs for class SkippedContent.

object_type: typing_extensions.Final = 'skipped_content'

sha1

sha1_git

sha256

blake2s256

length

status

reason

origin

ctime

check_reason(attribute, value)

Checks the reason is full if status != absent.

check_length(attribute, value)

Checks the length is positive or -1.

check_ctime(attribute, value)

Checks the ctime has a timezone.

to_dict()

Wrapper of attr.asdict that can be overridden by subclasses that have special handling of some of the fields.

classmethod from_data(data: bytes, reason: str, ctime: Optional[datetime.datetime] = None) → swh.model.model.SkippedContent

Generate a SkippedContent from a given data byte string.

This populates the SkippedContent with the hashes and length for the data passed as argument.

You can use attr.evolve on such a generated content to nullify some of its attributes, e.g. for tests.

classmethod from_dict(d)

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

Returns a unique key for this object, that can be used for deduplication.

class swh.model.model.MetadataAuthorityType(value)

Bases: enum.Enum

An enumeration.

DEPOSIT_CLIENT = 'deposit_client'

FORGE = 'forge'

REGISTRY = 'registry'

class swh.model.model.MetadataAuthority(type: swh.model.model.MetadataAuthorityType, url: str, metadata: Union[None, Dict[swh.model.model.KT, swh.model.model.VT], swh.model.collections.ImmutableDict[swh.model.model.KT, swh.model.model.VT]] = None)

Bases: swh.model.model.BaseModel

Represents an entity that provides metadata about an origin or software artifact.

Method generated by attrs for class MetadataAuthority.

object_type: typing_extensions.Final = 'metadata_authority'

type

url

metadata

to_dict()

Wrapper of attr.asdict that can be overridden by subclasses that have special handling of some of the fields.

classmethod from_dict(d)

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

Returns a unique key for this object, that can be used for deduplication.

class swh.model.model.MetadataFetcher(name: str, version: str, metadata: Union[None, Dict[swh.model.model.KT, swh.model.model.VT], swh.model.collections.ImmutableDict[swh.model.model.KT, swh.model.model.VT]] = None)

Bases: swh.model.model.BaseModel

Represents a software component used to fetch metadata from a metadata authority, and ingest them into the Software Heritage archive.

Method generated by attrs for class MetadataFetcher.

object_type: typing_extensions.Final = 'metadata_fetcher'

name

version

metadata

to_dict()

Wrapper of attr.asdict that can be overridden by subclasses that have special handling of some of the fields.

unique_key() → Union[Dict[str, str], Dict[str, bytes], bytes]

Returns a unique key for this object, that can be used for deduplication.

swh.model.model.normalize_discovery_date(value: Any) → datetime.datetime

class swh.model.model.RawExtrinsicMetadata(target: swh.model.swhids.ExtendedSWHID, discovery_date: Any, authority: swh.model.model.MetadataAuthority, fetcher: swh.model.model.MetadataFetcher, format: str, metadata: bytes, origin: Optional[str] = None, visit: Optional[int] = None, snapshot: Optional[swh.model.swhids.CoreSWHID] = None, release: Optional[swh.model.swhids.CoreSWHID] = None, revision: Optional[swh.model.swhids.CoreSWHID] = None, path: Optional[bytes] = None, directory: Optional[swh.model.swhids.CoreSWHID] = None, id: bytes = b'')

Bases: swh.model.model.HashableObject, swh.model.model.BaseModel

Method generated by attrs for class RawExtrinsicMetadata.

object_type: typing_extensions.Final = 'raw_extrinsic_metadata'

target

discovery_date

authority

fetcher

format

metadata

origin

visit

snapshot

release

revision

path

directory

id

compute_hash() → bytes

Derived model classes must implement this to compute the object hash.

This method is called by the object initialization if the id attribute is set to an empty value.

check_origin(attribute, value)

check_visit(attribute, value)

check_snapshot(attribute, value)

check_release(attribute, value)

check_revision(attribute, value)

check_path(attribute, value)

check_directory(attribute, value)

to_dict()

Wrapper of attr.asdict that can be overridden by subclasses that have special handling of some of the fields.

classmethod from_dict(d)

swhid() → swh.model.swhids.ExtendedSWHID

Returns a SWHID representing this RawExtrinsicMetadata object.

class swh.model.model.ExtID(extid_type: str, extid: bytes, target: swh.model.swhids.CoreSWHID, extid_version: int = 0, id: bytes = b'')

Bases: swh.model.model.HashableObject, swh.model.model.BaseModel

Method generated by attrs for class ExtID.

object_type: typing_extensions.Final = 'extid'

extid_type

extid

target

extid_version

id

classmethod from_dict(d)

compute_hash() → bytes

Derived model classes must implement this to compute the object hash.

This method is called by the object initialization if the id attribute is set to an empty value.