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M20220509 changes

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* Do not depend on the uuid representation in Builder_db.Rep; instead
  copy the custom caqti type so the migration doesn't break if
  Builder_db.Rep changes
* We don't need to recreate any indices since we don't change the
  schema: The uuid column was erroneously VARCHAR(36) before as well(!)
This commit is contained in:
Reynir Björnsson 2022-05-17 12:14:39 +02:00
parent bfc4e5e64f
commit da2aa77b53
1 changed files with 10 additions and 12 deletions
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22
bin/migrations/m20220509.ml
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@ -13,6 +13,14 @@ let old_uuid_rep =
in
Caqti_type.custom ~encode ~decode Caqti_type.string
let new_uuid_rep =
let encode uuid = Ok (Uuidm.to_string uuid) in
let decode s =
Uuidm.of_string s
|> Option.to_result ~none:"failed to decode uuid"
in
Caqti_type.custom ~encode ~decode Caqti_type.string
let uuids_byte_encoded_q =
Caqti_type.unit ->*
Caqti_type.tup2 (Builder_db.Rep.id (`build : [`build])) old_uuid_rep @@
@ -20,11 +28,11 @@ let uuids_byte_encoded_q =
let uuids_hex_encoded_q =
Caqti_type.unit ->*
Caqti_type.tup2 (Builder_db.Rep.id (`build : [`build])) Builder_db.Rep.uuid @@
Caqti_type.tup2 (Builder_db.Rep.id (`build : [`build])) new_uuid_rep @@
"SELECT id, uuid FROM build"
let migrate_q =
Caqti_type.tup2 (Builder_db.Rep.id (`build : [`build])) Builder_db.Rep.uuid ->.
Caqti_type.tup2 (Builder_db.Rep.id (`build : [`build])) new_uuid_rep ->.
Caqti_type.unit @@
"UPDATE build SET uuid = $2 WHERE id = $1"
@ -33,20 +41,11 @@ let rollback_q =
Caqti_type.unit @@
"UPDATE build SET uuid = $2 WHERE id = $1"
let create_index =
Caqti_type.unit ->. Caqti_type.unit @@
"CREATE INDEX idx_build_uuid ON build(uuid);"
let drop_index =
Caqti_type.unit ->. Caqti_type.unit @@
"DROP INDEX idx_build_uuid;"
let migrate _datadir (module Db : Caqti_blocking.CONNECTION) =
let open Grej.Infix in
Grej.check_version ~user_version:old_version (module Db) >>= fun () ->
Db.collect_list uuids_byte_encoded_q () >>= fun old_uuids ->
Grej.list_iter_result (Db.exec migrate_q) old_uuids >>= fun () ->
Db.exec create_index () >>= fun () ->
Db.exec (Grej.set_version new_version) ()
let rollback _datadir (module Db : Caqti_blocking.CONNECTION) =
@ -54,5 +53,4 @@ let rollback _datadir (module Db : Caqti_blocking.CONNECTION) =
Grej.check_version ~user_version:new_version (module Db) >>= fun () ->
Db.collect_list uuids_hex_encoded_q () >>= fun new_uuids ->
Grej.list_iter_result (Db.exec rollback_q) new_uuids >>= fun () ->
Db.exec drop_index () >>= fun () ->
Db.exec (Grej.set_version old_version) ()