Reynir Björnsson
bde3baec46
Each migration is, for the most part, a module that exposes expected database version numbers, command identifier and documentation. This results in all information about the migration and rollback are found in the module itself, and builder_migrations.ml only has to reference the module. Some migrations require foreign keys constraints are disabled. It is not possible to enable or disable foreign key constraints inside a transaction.
50 lines
1.6 KiB
OCaml
50 lines
1.6 KiB
OCaml
let old_version = 1L
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let new_version = 2L
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let identifier = "2021-02-16"
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let migrate_doc = "change to scrypt hashed passwords (NB: destructive!!)"
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let rollback_doc = "rollback scrypt hashed passwords (NB: destructive!!)"
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let drop_user =
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Caqti_request.exec ~oneshot:true
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Caqti_type.unit
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"DROP TABLE user"
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let new_user =
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Caqti_request.exec ~oneshot:true
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Caqti_type.unit
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{| CREATE TABLE user (
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id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
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username VARCHAR(255) NOT NULL UNIQUE,
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password_hash BLOB NOT NULL,
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password_salt BLOB NOT NULL,
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scrypt_n INTEGER NOT NULL,
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scrypt_r INTEGER NOT NULL,
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scrypt_p INTEGER NOT NULL
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)
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|}
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let old_user =
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Caqti_request.exec
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Caqti_type.unit
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{| CREATE TABLE user (
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id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
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username VARCHAR(255) NOT NULL UNIQUE,
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password_hash BLOB NOT NULL,
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password_salt BLOB NOT NULL,
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password_iter INTEGER NOT NULL
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)
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|}
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let migrate _datadir (module Db : Caqti_blocking.CONNECTION) =
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let open Rresult.R.Infix in
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Grej.check_version ~user_version:old_version (module Db) >>= fun () ->
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Db.exec drop_user () >>= fun () ->
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Db.exec new_user () >>= fun () ->
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Db.exec (Grej.set_version new_version) ()
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let rollback _datadir (module Db : Caqti_blocking.CONNECTION) =
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let open Rresult.R.Infix in
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Grej.check_version ~user_version:new_version (module Db) >>= fun () ->
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Db.exec drop_user () >>= fun () ->
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Db.exec old_user () >>= fun () ->
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Db.exec (Grej.set_version old_version) ()
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