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module Db = struct
type t = {
db : Sqlite3.db;
begin_transaction : Sqlite3.stmt;
commit : Sqlite3.stmt;
rollback : Sqlite3.stmt;
}
let create ?mode database =
let db = Sqlite3.db_open ?mode database in
Sqlite3.busy_timeout db 1000;
let begin_transaction = Sqlite3.prepare db "BEGIN TRANSACTION" in
let commit = Sqlite3.prepare db "COMMIT" in
let rollback = Sqlite3.prepare db "ROLLBACK" in
{ db; begin_transaction; commit; rollback }
let close t = Sqlite3.db_close t.db
let or_fail db ~cmd res =
match res with
| Sqlite3.Rc.OK -> ()
| err ->
let msg =
Printf.sprintf "Sqlite3 driver: [or_fail] [%s] %s (executing %S)"
(Sqlite3.Rc.to_string err) (Sqlite3.errmsg db) cmd
in
failwith msg
let no_callback _ =
failwith "Sqlite3 driver: [no_callback] exec used with a query!"
let exec_stmt t ?(cb = no_callback) stmt =
let rec loop () =
match Sqlite3.step stmt with
| Sqlite3.Rc.DONE -> ()
| Sqlite3.Rc.ROW ->
let cols = Sqlite3.data_count stmt in
cb (List.init cols (fun i -> Sqlite3.column stmt i));
loop ()
| err ->
let msg =
Printf.sprintf "Sqlite3 driver: [exec_stmt] [%s] %s"
(Sqlite3.Rc.to_string err) (Sqlite3.errmsg t.db)
in
failwith msg
in
loop ()
let bind t stmt values =
Sqlite3.reset stmt |> or_fail t.db ~cmd:"reset";
List.iteri
(fun i v -> Sqlite3.bind stmt (i + 1) v |> or_fail t.db ~cmd:"bind")
values
let exec t stmt values =
bind t stmt values;
exec_stmt t stmt
let query t stmt values =
bind t stmt values;
let results = ref [] in
let cb row = results := row :: !results in
exec_stmt t ~cb stmt;
List.rev !results
let with_transaction t fn =
exec t t.begin_transaction [];
match fn () with
| x ->
exec t t.commit [];
x
| exception exn ->
exec t t.rollback [];
raise exn
end
module T = struct
let migrations_table = "schema_migrations"
let quote_statement s = "\"" ^ s ^ "\""
let to_opt_pair x y =
match (x, y) with Some x, Some y -> Some (x, y) | _ -> None
let database_exists database =
let open Lwt.Syntax in
let* () = Logs_lwt.debug (fun m -> m "Querying existing databases") in
Lwt.catch
(fun () ->
let+ st = Lwt_unix.stat database in
match st with Unix.{ st_kind = S_REG; _ } -> true | _ -> false)
(function
| Unix.Unix_error (Unix.ENOENT, _, _) -> Lwt.return_false
| exn -> Lwt.fail exn)
let delete_database database = Lwt_unix.unlink database
let ensure_version_table_exists t =
let open Lwt.Syntax in
let* () =
Logs_lwt.info (fun m -> m "Creating the migration table if not exists")
in
let stmt =
Sqlite3.prepare t.Db.db
("CREATE TABLE IF NOT EXISTS "
^ quote_statement migrations_table
^ "(version bigint NOT NULL, dirty boolean NOT NULL, CONSTRAINT \
schema_migrations_pkey PRIMARY KEY (version));")
in
Db.with_transaction t (fun () -> Db.exec t stmt []) |> Lwt.return
let up ~host:_ ?port:_ ?user:_ ?password:_ ~database migration =
let open Lwt.Syntax in
let t = Db.create ~mode:`NO_CREATE database in
Db.with_transaction t (fun () ->
let version = migration.Omigrate.Migration.version in
let* () =
Logs_lwt.info (fun m -> m "Applying up migration %Ld" version)
in
let _ =
let stmt = Sqlite3.prepare t.Db.db migration.Omigrate.Migration.up in
Db.query t stmt []
in
let* () =
Logs_lwt.debug (fun m ->
m "Inserting version %Ld in migration table" version)
in
let () =
let stmt =
Sqlite3.prepare t.db
("DELETE FROM " ^ quote_statement migrations_table ^ ";")
in
Db.exec t stmt []
in
let () =
let stmt =
Sqlite3.prepare t.db
("INSERT INTO "
^ quote_statement migrations_table
^ " (version, dirty) VALUES (?, ?);")
in
Db.exec t stmt
[
Sqlite3.Data.opt_int64 (Some version);
Sqlite3.Data.opt_bool (Some false);
]
in
Lwt.return_unit)
let down ~host:_ ?port:_ ?user:_ ?password:_ ~database ?previous migration =
let open Lwt.Syntax in
let t = Db.create ~mode:`NO_CREATE database in
Db.with_transaction t (fun () ->
let version = migration.Omigrate.Migration.version in
let* () =
Logs_lwt.info (fun m -> m "Applying down migration %Ld" version)
in
let _ =
let stmt =
Sqlite3.prepare t.Db.db migration.Omigrate.Migration.down
in
Db.query t stmt []
in
let* () =
Logs_lwt.debug (fun m ->
m "Removing version %Ld in migration table" version)
in
let () =
let stmt =
Sqlite3.prepare t.db
("DELETE FROM " ^ quote_statement migrations_table ^ ";")
in
Db.exec t stmt []
in
match previous with
| None ->
let* () =
Logs_lwt.debug (fun m -> m "Migration table left empty")
in
Lwt.return_unit
| Some previous ->
let previous_version = previous.Omigrate.Migration.version in
let* () =
Logs_lwt.debug (fun m ->
m "Shifting migration table version to %Ld" previous_version)
in
let () =
let stmt =
Sqlite3.prepare t.db
("INSERT INTO "
^ quote_statement migrations_table
^ " (version, dirty) VALUES (?, ?);")
in
Db.exec t stmt
[
Sqlite3.Data.opt_int64 (Some previous_version);
Sqlite3.Data.opt_bool (Some false);
]
in
Lwt.return_unit)
let create ~host:_ ?port:_ ?user:_ ?password:_ database =
let open Lwt.Syntax in
let* exists = database_exists database in
let t = ref None in
let* () =
if exists then Logs_lwt.info (fun m -> m "Database already exists")
else
let* () = Logs_lwt.info (fun m -> m "Creating the database") in
t := Some (Db.create database);
Lwt.return_unit
in
let t = Option.value !t ~default:(Db.create ~mode:`NO_CREATE database) in
ensure_version_table_exists t
let drop ~host:_ ?port:_ ?user:_ ?password:_ database =
let open Lwt.Syntax in
let* exist = database_exists database in
if not exist then Logs_lwt.info (fun m -> m "Database does not exist")
else
let* () = Logs_lwt.info (fun m -> m "Deleting the database") in
delete_database database
let version ~host:_ ?port:_ ?user:_ ?password:_ ~database () =
let open Lwt.Syntax in
let* () = Logs_lwt.debug (fun m -> m "Querying all versions") in
let t = Db.create ~mode:`NO_CREATE database in
let stmt =
Sqlite3.prepare t.Db.db
("SELECT version, dirty FROM "
^ quote_statement migrations_table
^ "ORDER BY version DESC LIMIT 1;")
in
match Db.query t stmt [] with
| [ [ version; dirty ] ] ->
let version = Sqlite3.Data.to_int64 version in
let dirty = Sqlite3.Data.to_bool dirty in
to_opt_pair version dirty |> Lwt.return
| _ -> Lwt.return_none
let parse_uri s =
let module Omigrate_error = Omigrate.Error in
let module Connection = Omigrate.Driver.Connection in
let uri = Uri.of_string s in
let host = Uri.host_with_default uri in
let user = Uri.user uri in
let pass = Uri.password uri in
let port = Uri.port uri in
let db_result =
match Uri.path uri with
| "/" -> Error (Omigrate_error.bad_uri s)
| path -> Ok path
in
Result.map (fun db -> Connection.{ host; user; pass; port; db }) db_result
end
let () = Omigrate.Driver.register "sqlite3" (module T)