conex 0.9.2 · OCaml Package

Persistent data: on wire and record types

Every resource in conex is a piece of data (or metadata), and has its own purpose. Resources stored on disk consists of a common header: a name, a type, a counter, a wraparound counter, and a creation timestamp. There are broadly three kinds of resources: those containing identities (Team and Author), those regulating access to packages (Authorisation), and those with the digests of the opam repository data (Package and Release).

Names and identifiers

type name = string

The name of resources, used e.g. for package names.

val pp_name : name Conex_utils.fmt

pp_name name is a pretty printer for name.

val name_equal : name -> name -> bool

name_equal a b is the result of a case insensitive comparison of a and b.

type identifier = string

The type of identifiers.

val pp_id : identifier Conex_utils.fmt

pp_id id is a pretty printer for identifier.

val id_equal : identifier -> identifier -> bool

id_equal a b is the result of a case insensitive comparison of a and b.

Wire format

module Wire : sig ... end

The wire encoding is abstract here, one suitable decoding and encoding engine is Conex_opam_encoding. The wire encoding is used for digest computations, and persistent storage on disk.

Resource types

type typ = [

| `Signature
| `Key
| `Account
| `Author
| `Wrap
| `Team
| `Authorisation
| `Package
| `Release

]

The sum type of all possible resources.

val typ_to_string : typ -> string

resource_to_string res is the string representation of res.

val string_to_typ : string -> typ option

string_to_resource str is either Some resource or None.

val pp_typ : typ Conex_utils.fmt

pp_resource pp is a pretty printer for resource.

val typ_equal : typ -> typ -> bool

resource_equal a b is true if they are the same, otherwise false.

val typ_of_wire : Wire.s -> (typ, string) Stdlib.result

module Header : sig ... end

Common header on disk

Asymmetric key types

module Key : sig ... end

Cryptographic signatures

module Signature : sig ... end

Digests

module Digest : sig ... end

Author

module Author : sig ... end

An author contains a list of approved resources (name, typ, digest). It also contains a list of key and signature pairs, and a list of accounts. Keys have to be approved by a quorum of janitors, but the resource list is modified only by the author themselves.

Team

module Team : sig ... end

A team consists of a group of authors. Team members can dynamically join and leave.

Authorisation

module Authorisation : sig ... end

An authorisation contains the information who is authorised to modify a package. There is always a single authorisation file per package, approved by a quorum of janitors.

Package

module Package : sig ... end

A package lists all releases of a given package. There is one package resource for each package.

Release

module Release : sig ... end

A release contains a map of all files in the repository relevant for this release and their digests.

package conex