dag

type Definition struct {
	// the name of the entity (bug, pull-request, ...), for human consumption
	Typename string
	// the Namespace in git references (bugs, prs, ...)
	Namespace string
	// a function decoding a JSON message into an Operation
	OperationUnmarshaler func(author identity.Interface, raw json.RawMessage, resolver identity.Resolver) (Operation, error)
	// the expected format version number, that can be used for data migration/upgrade
	FormatVersion uint
}

type Entity struct {
	Definition
	// contains filtered or unexported fields
}

type Operation interface {
	// Id return the Operation identifier
	//
	// Some care need to be taken to define a correct Id derivation and enough entropy in the data used to avoid
	// collisions. Notably:
	// - the Id of the first Operation will be used as the Id of the Entity. Collision need to be avoided across entities
	//   of the same type (example: no collision within the "bug" namespace).
	// - collisions can also happen within the set of Operations of an Entity. Simple Operation might not have enough
	//   entropy to yield unique Ids (example: two "close" operation within the same second, same author).
	//   If this is a concern, it is recommended to include a piece of random data in the operation's data, to guarantee
	//   a minimal amount of entropy and avoid collision.
	//
	//   Author's note: I tried to find a clever way around that inelegance (stuffing random useless data into the stored
	//   structure is not exactly elegant) but I failed to find a proper way. Essentially, anything that would reuse some
	//   other data (parent operation's Id, lamport clock) or the graph structure (depth) impose that the Id would only
	//   make sense in the context of the graph and yield some deep coupling between Entity and Operation. This in turn
	//   make the whole thing even less elegant.
	//
	// A common way to derive an Id will be to use the entity.DeriveId() function on the serialized operation data.
	Id() entity.Id
	// Validate check if the Operation data is valid
	Validate() error
	// Author returns the author of this operation
	Author() identity.Interface
}

type OperationWithFiles interface {
	Operation

	// GetFiles return the files needed by this operation
	// This implies that the Operation maintain and store internally the references to those files. This is how
	// this information is read later, when loading from storage.
	// For example, an operation that has a text value referencing some files would maintain a mapping (text ref -->
	// hash).
	GetFiles() []repository.Hash
}

type PGPKeyring []*identity.Key

type StreamedEntity struct {
	Entity *Entity
	Err    error
}