package caqti-driver-postgresql
PostgreSQL driver for Caqti based on C bindings
Install
Dune Dependency
Authors
Maintainers
Sources
caqti-v1.2.3.tbz
sha256=2fc68b60d90281e11a3272fa0e760cc22282a317b734778ab0bf987ed08a2f72
sha512=c0f214776bd2eda73f54ab0f64b89a90d12afc0b793308ee21374d70fc096073a24ae66fe0516304a4dc5da8ac5b98cd7df2d2eb88b002f616ef788105c1ec64
doc/src/caqti-driver-postgresql/caqti_driver_postgresql.ml.html
Source file caqti_driver_postgresql.ml
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(* Copyright (C) 2017--2020 Petter A. Urkedal <paurkedal@gmail.com> * * This library is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as published by * the Free Software Foundation, either version 3 of the License, or (at your * option) any later version, with the OCaml static compilation exception. * * This library is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public * License for more details. * * You should have received a copy of the GNU Lesser General Public License * along with this library. If not, see <http://www.gnu.org/licenses/>. *) open Caqti_common_priv open Printf module Pg = Postgresql let ( |>? ) r f = match r with Ok x -> f x | Error _ as r -> r module Int_hashable = struct type t = int let equal (i : int) (j : int) = i = j let hash (i : int) = Hashtbl.hash i end module Int_hashtbl = Hashtbl.Make (Int_hashable) let start_req = Caqti_request.exec Caqti_type.unit "BEGIN" let commit_req = Caqti_request.exec Caqti_type.unit "COMMIT" let rollback_req = Caqti_request.exec Caqti_type.unit "ROLLBACK" type Caqti_error.msg += Pg_msg of Pg.error let () = let pp ppf = function | Pg_msg error -> Format.pp_print_string ppf (Pg.string_of_error error) | _ -> assert false in Caqti_error.define_msg ~pp [%extension_constructor Pg_msg] let driver_info = Caqti_driver_info.create ~uri_scheme:"postgresql" ~dialect_tag:`Pgsql ~parameter_style:(`Indexed (fun i -> "$" ^ string_of_int (succ i))) ~can_pool:true ~can_concur:true ~can_transact:true ~describe_has_typed_params:true ~describe_has_typed_fields:true () module Pg_ext = struct let bool_of_string = function | "t" -> true | "f" -> false | _ -> invalid_arg "Pg_ext.bool_of_string" let string_of_bool = function true -> "t" | false -> "f" let query_string (db : Pg.connection) templ = let buf = Buffer.create 64 in let rec loop = function | Caqti_query.L s -> Buffer.add_string buf s | Caqti_query.Q s -> Buffer.add_char buf '\''; Buffer.add_string buf (db#escape_string s); Buffer.add_char buf '\'' | Caqti_query.P i -> bprintf buf "$%d" (i + 1) | Caqti_query.S frags -> List.iter loop frags in loop templ; Buffer.contents buf let escaped_connvalue s = let buf = Buffer.create (String.length s) in let aux = function | '\\' -> Buffer.add_string buf {|\\|} | '\'' -> Buffer.add_string buf {|\'|} | ch -> Buffer.add_char buf ch in String.iter aux s; Buffer.contents buf let parse_uri uri = (match Uri.get_query_param uri "notice_processing" with | None -> Ok (`Quiet, uri) | Some "quiet" -> Ok (`Quiet, Uri.remove_query_param uri "notice_processing") | Some "stderr" -> Ok (`Stderr, Uri.remove_query_param uri "notice_processing") | Some _ -> let msg = Caqti_error.Msg "Invalid argument for notice_processing." in Error (Caqti_error.connect_rejected ~uri msg)) |>? fun (notice_processing, uri') -> let conninfo = if Uri.host uri <> None then Uri.to_string uri' else let mkparam k v = k ^ " = '" ^ escaped_connvalue v ^ "'" in let mkparams (k, vs) = List.map (mkparam k) vs in String.concat " " (List.flatten (List.map mkparams (Uri.query uri'))) in Ok (conninfo, notice_processing) let string_of_ptime_span t = let is_neg = Ptime.Span.compare t Ptime.Span.zero < 0 in let d, ps = Ptime.Span.(to_d_ps (abs t ))in let buf = Buffer.create 32 in if d <> 0 then bprintf buf "%d days " (if is_neg then -d else d); let s, ps = Int64.(div ps 1_000_000_000_000L |> to_int, rem ps 1_000_000_000_000L) in let hour, s = s / 3600, s mod 3600 in let minute, s = s / 60, s mod 60 in if is_neg then Buffer.add_char buf '-'; bprintf buf "%02d:%02d:%02d" hour minute s; if ps <> 0L then bprintf buf ".%06Ld" (Int64.div ps 1_000_000L); Buffer.contents buf let ps_of_decimal s = try (match String.length s with | 2 -> Ok (Int64.(mul (of_string s) 1_000_000_000_000L)) | n when n < 2 -> Error "Missing digits in seconds of interval string." | _ when s.[2] <> '.' -> Error "Expected period after seconds in interval string." | n -> let buf = Bytes.make 14 '0' in Bytes.blit_string s 0 buf 0 2; Bytes.blit_string s 3 buf 2 (min 12 (n - 3)); Ok (Int64.of_string (Bytes.to_string buf))) with Failure _ -> Error "Seconds in interval string is not numeric." let ps_of_hms s = (match String.split_on_char ':' s with | [hours; minutes; seconds] -> (try let hour = int_of_string hours in let minute = int_of_string minutes in (match ps_of_decimal seconds with | Ok ps -> let hm = Int64.of_int (abs hour * 60 + minute) in let ps = Int64.(add ps (mul hm 60_000_000_000_000L)) in Ok (if s.[0] = '-' then Int64.neg ps else ps) | Error msg -> Error msg) with Failure _ -> Error "Non-integer hour or minute in interval string.") | _ -> Error "Expected HH:MM:SS[.F] in interval string.") let ptime_span_of_string s = let span_of_d_ps (d, ps) = let d, ps = if Int64.compare ps Int64.zero >= 0 then (d, ps) else (d - 1, Int64.add ps 86_400_000_000_000_000L) in (match Ptime.Span.of_d_ps (d, ps) with | Some t -> Ok t | None -> Error "Out for range for Ptime.span.") in try (match String.split_on_char ' ' s with | [d; "days"] -> span_of_d_ps (int_of_string d, 0L) | [d; "days"; hms] -> ps_of_hms hms |>? fun ps -> span_of_d_ps (int_of_string d, ps) | [hms] -> ps_of_hms hms |>? fun ps -> span_of_d_ps (0, ps) | _ -> Error "Unhandled interval format.") with Failure _ -> Error "Non-integer days in interval string." end let is_binary_param : type a. a Caqti_type.field -> bool = function | Caqti_type.Octets -> true | _ -> false let rec set_binary_params : type a. bool array -> a Caqti_type.t -> int -> int = fun bp -> function | Caqti_type.Unit -> fun i -> i | Caqti_type.Field ft -> fun i -> bp.(i) <- is_binary_param ft; i + 1 | Caqti_type.Option t -> set_binary_params bp t | Caqti_type.Tup2 (t0, t1) -> set_binary_params bp t0 %> set_binary_params bp t1 | Caqti_type.Tup3 (t0, t1, t2) -> set_binary_params bp t0 %> set_binary_params bp t1 %> set_binary_params bp t2 | Caqti_type.Tup4 (t0, t1, t2, t3) -> set_binary_params bp t0 %> set_binary_params bp t1 %> set_binary_params bp t2 %> set_binary_params bp t3 | Caqti_type.Custom {rep; _} -> set_binary_params bp rep module type STRING_ENCODER = sig val encode_string : string -> string val encode_octets : string -> string end module Make_encoder (String_encoder : STRING_ENCODER) = struct open String_encoder let rec encode_field : type a. uri: Uri.t -> a Caqti_type.field -> a -> (string, _) result = fun ~uri field_type x -> (match field_type with | Caqti_type.Bool -> Ok (Pg_ext.string_of_bool x) | Caqti_type.Int -> Ok (string_of_int x) | Caqti_type.Int32 -> Ok (Int32.to_string x) | Caqti_type.Int64 -> Ok (Int64.to_string x) | Caqti_type.Float -> Ok (sprintf "%.17g" x) | Caqti_type.String -> Ok (encode_string x) | Caqti_type.Octets -> Ok (encode_octets x) | Caqti_type.Pdate -> Ok (iso8601_of_pdate x) | Caqti_type.Ptime -> Ok (Ptime.to_rfc3339 ~space:true ~tz_offset_s:0 ~frac_s:6 x) | Caqti_type.Ptime_span -> Ok (Pg_ext.string_of_ptime_span x) | _ -> (match Caqti_type.Field.coding driver_info field_type with | None -> Error (Caqti_error.encode_missing ~uri ~field_type ()) | Some (Caqti_type.Field.Coding {rep; encode; _}) -> (match encode x with | Ok y -> encode_field ~uri rep y | Error msg -> let msg = Caqti_error.Msg msg in let typ = Caqti_type.field field_type in Error (Caqti_error.encode_rejected ~uri ~typ msg)))) let rec encode' : type a. uri: Uri.t -> string array -> a Caqti_type.t -> a -> int -> (int, _) result = fun ~uri params t x -> (match t, x with | Caqti_type.Unit, () -> fun i -> Ok i | Caqti_type.Field ft, fv -> fun i -> (match encode_field ~uri ft fv with | Ok s -> params.(i) <- s; Ok (i + 1) | Error _ as r -> r) | Caqti_type.Option t, None -> fun i -> Ok (i + Caqti_type.length t) | Caqti_type.Option t, Some x -> encode' ~uri params t x | Caqti_type.Tup2 (t0, t1), (x0, x1) -> encode' ~uri params t0 x0 %>? encode' ~uri params t1 x1 | Caqti_type.Tup3 (t0, t1, t2), (x0, x1, x2) -> encode' ~uri params t0 x0 %>? encode' ~uri params t1 x1 %>? encode' ~uri params t2 x2 | Caqti_type.Tup4 (t0, t1, t2, t3), (x0, x1, x2, x3) -> encode' ~uri params t0 x0 %>? encode' ~uri params t1 x1 %>? encode' ~uri params t2 x2 %>? encode' ~uri params t3 x3 | Caqti_type.Custom {rep; encode = encode_custom; _}, x -> fun i -> (match encode_custom x with | Ok y -> encode' ~uri params rep y i | Error msg -> let msg = Caqti_error.Msg msg in Error (Caqti_error.encode_rejected ~uri ~typ:t msg))) let encode ~uri params t x = (match encode' ~uri params t x 0 with | Ok n -> assert (n = Array.length params); Ok () | Error _ as r -> r) end module Param_encoder = Make_encoder (struct let encode_string s = s let encode_octets s = s end) let rec decode_field : type a. uri: Uri.t -> a Caqti_type.field -> string -> (a, _) result = fun ~uri field_type s -> let conv f s = try Ok (f s) with _ -> let msg = Caqti_error.Msg (sprintf "Invalid value %S." s) in let typ = Caqti_type.field field_type in Error (Caqti_error.decode_rejected ~uri ~typ msg) in (match field_type with | Caqti_type.Bool -> conv Pg_ext.bool_of_string s | Caqti_type.Int -> conv int_of_string s | Caqti_type.Int32 -> conv Int32.of_string s | Caqti_type.Int64 -> conv Int64.of_string s | Caqti_type.Float -> conv float_of_string s | Caqti_type.String -> Ok s | Caqti_type.Octets -> Ok (Postgresql.unescape_bytea s) | Caqti_type.Pdate -> (match pdate_of_iso8601 s with | Ok _ as r -> r | Error msg -> let msg = Caqti_error.Msg msg in let typ = Caqti_type.field field_type in Error (Caqti_error.decode_rejected ~uri ~typ msg)) | Caqti_type.Ptime -> (* TODO: Improve parsing. *) (match ptime_of_rfc3339_utc s with | Ok _ as r -> r | Error msg -> let msg = Caqti_error.Msg msg in let typ = Caqti_type.field field_type in Error (Caqti_error.decode_rejected ~uri ~typ msg)) | Caqti_type.Ptime_span -> (match Pg_ext.ptime_span_of_string s with | Ok _ as r -> r | Error msg -> let msg = Caqti_error.Msg msg in let typ = Caqti_type.field field_type in Error (Caqti_error.decode_rejected ~uri ~typ msg)) | _ -> (match Caqti_type.Field.coding driver_info field_type with | None -> Error (Caqti_error.decode_missing ~uri ~field_type ()) | Some (Caqti_type.Field.Coding {rep; decode; _}) -> (match decode_field ~uri rep s with | Ok y -> (match decode y with | Ok _ as r -> r | Error msg -> let msg = Caqti_error.Msg msg in let typ = Caqti_type.field field_type in Error (Caqti_error.decode_rejected ~uri ~typ msg)) | Error _ as r -> r))) let rec decode_row' : type b. uri: Uri.t -> Pg.result * int -> b Caqti_type.t -> int -> (int * b, _) result = fun ~uri ((resp, i) as row) t -> (match t with | Caqti_type.Unit -> fun j -> Ok (j, ()) | Caqti_type.Field ft -> fun j -> (match decode_field ~uri ft (resp#getvalue i j) with | Ok y -> Ok (j + 1, y) | Error _ as r -> r) | Caqti_type.Option t -> fun j -> let j' = j + Caqti_type.length t in let rec null_only k = k = j' || (resp#getisnull i j && null_only (k + 1)) in if null_only j then Ok (j', None) else (match decode_row' ~uri row t j with | Ok (j'', y) -> assert (j' = j''); Ok (j'', Some y) | Error _ as r -> r) | Caqti_type.Tup2 (t0, t1) -> fun j -> decode_row' ~uri row t0 j |>? fun (j, y0) -> decode_row' ~uri row t1 j |>? fun (j, y1) -> Ok (j, (y0, y1)) | Caqti_type.Tup3 (t0, t1, t2) -> fun j -> decode_row' ~uri row t0 j |>? fun (j, y0) -> decode_row' ~uri row t1 j |>? fun (j, y1) -> decode_row' ~uri row t2 j |>? fun (j, y2) -> Ok (j, (y0, y1, y2)) | Caqti_type.Tup4 (t0, t1, t2, t3) -> fun j -> decode_row' ~uri row t0 j |>? fun (j, y0) -> decode_row' ~uri row t1 j |>? fun (j, y1) -> decode_row' ~uri row t2 j |>? fun (j, y2) -> decode_row' ~uri row t3 j |>? fun (j, y3) -> Ok (j, (y0, y1, y2, y3)) | Caqti_type.Custom {rep; decode; _} as typ -> fun j -> (match decode_row' ~uri row rep j with | Ok (j, y) -> (match decode y with | Ok z -> Ok (j, z) | Error msg -> let msg = Caqti_error.Msg msg in Error (Caqti_error.decode_rejected ~uri ~typ msg)) | Error _ as r -> r)) let decode_row ~uri resp row_type = (match decode_row' ~uri resp row_type 0 with | Ok (j, y) -> assert (j = Caqti_type.length row_type); Ok y | Error _ as r -> r) type prepared = { query: string; param_length: int; binary_params: bool array; } module Connect_functor (System : Caqti_driver_sig.System_unix) = struct open System module H = Caqti_connection.Make_helpers (System) let (>>=?) m mf = m >>= (function Ok x -> mf x | Error _ as r -> return r) let (>|=?) m f = m >|= (function Ok x -> f x | Error _ as r -> r) let driver_info = driver_info module Pg_io = struct let communicate db step = let aux fd = let rec loop = function | Pg.Polling_reading -> Unix.poll ~read:true fd >>= fun _ -> (match step () with | exception Pg.Error msg -> return (Error msg) | ps -> loop ps) | Pg.Polling_writing -> Unix.poll ~write:true fd >>= fun _ -> (match step () with | exception Pg.Error msg -> return (Error msg) | ps -> loop ps) | Pg.Polling_failed | Pg.Polling_ok -> return (Ok ()) in loop Pg.Polling_writing in (match db#socket with | exception Pg.Error msg -> return (Error msg) | socket -> Unix.wrap_fd aux (Obj.magic socket)) let get_next_result ~uri ~query db = let rec retry fd = db#consume_input; if db#is_busy then Unix.poll ~read:true fd >>= (fun _ -> retry fd) else return (Ok db#get_result) in try Unix.wrap_fd retry (Obj.magic db#socket) with Pg.Error msg -> return (Error (Caqti_error.request_failed ~uri ~query (Pg_msg msg))) let get_result ~uri ~query ?(ensure_single_result=true) db = get_next_result ~uri ~query db >>= (function | Ok None -> let msg = Caqti_error.Msg "No response received after send." in return (Error (Caqti_error.request_failed ~uri ~query msg)) | Ok (Some result) -> if ensure_single_result then get_next_result ~uri ~query db >>= (function | Ok None -> return (Ok result) | Ok (Some _) -> let msg = Caqti_error.Msg "More than one response received." in return (Error (Caqti_error.response_rejected ~uri ~query msg)) | Error _ as r -> return r) else return (Ok result) | Error _ as r -> return r) let check_query_result ~uri ~query result mult = let reject msg = let msg = Caqti_error.Msg msg in Error (Caqti_error.response_rejected ~uri ~query msg) in let fail msg = let msg = Caqti_error.Msg msg in Error (Caqti_error.request_failed ~uri ~query msg) in (match result#status with | exception Pg.Error msg -> Error (Caqti_error.request_failed ~uri ~query (Pg_msg msg)) | Pg.Command_ok -> (match Caqti_mult.expose mult with | `Zero -> Ok () | (`One | `Zero_or_one | `Zero_or_more) -> reject "Tuples expected for this query.") | Pg.Tuples_ok -> (match Caqti_mult.expose mult with | `Zero -> if result#ntuples = 0 then Ok () else reject "No tuples expected for this query." | `One -> if result#ntuples = 1 then Ok () else ksprintf reject "Received %d tuples, expected one." result#ntuples | `Zero_or_one -> if result#ntuples <= 1 then Ok () else ksprintf reject "Received %d tuples, expected at most one." result#ntuples | `Zero_or_more -> Ok ()) | Pg.Empty_query -> fail "The query was empty." | Pg.Bad_response -> reject result#error | Pg.Fatal_error -> fail result#error | Pg.Nonfatal_error -> Ok () (* TODO: Log *) | Pg.Copy_out | Pg.Copy_in | Pg.Copy_both -> reject "Received unexpected copy response." | Pg.Single_tuple -> reject "Received unexpected single-tuple response.") let check_command_result ~uri ~query result = check_query_result ~uri ~query result Caqti_mult.zero let get_and_check_result ~uri ~query db = get_result ~uri ~query db >|=? check_command_result ~uri ~query end (* Driver Interface *) module type CONNECTION = Caqti_connection_sig.S with type 'a future := 'a System.future and type ('a, 'err) stream := ('a, 'err) System.Stream.t module Make_connection_base (Db : sig val uri : Uri.t val db : Pg.connection end) = struct open Db module Copy_encoder = Make_encoder (struct let encode_string s = "\"" ^ (String.concat "\"\"" (String.split_on_char '"' s)) ^ "\"" let encode_octets s = db#escape_bytea s end) let using_db_ref = ref false let using_db f = H.assert_single_use ~what:"PostgreSQL connection" using_db_ref f let in_transaction = ref false let prepare_cache : prepared Int_hashtbl.t = Int_hashtbl.create 19 let query_name_of_id = sprintf "_caq%d" let wrap_pg ~query f = try Ok (f ()) with | Postgresql.Error err -> Error (Caqti_error.request_failed ~uri ~query (Pg_msg err)) let send_query ?params ?binary_params query = wrap_pg ~query @@ fun () -> db#send_query ?params ?binary_params query let send_prepare query_id query = wrap_pg ~query @@ fun () -> db#send_prepare (query_name_of_id query_id) query let send_query_prepared ?params ?binary_params ~query ~query_id = wrap_pg ~query @@ fun () -> db#send_query_prepared ?params ?binary_params (query_name_of_id query_id) let reset () = Log.warn (fun p -> p "Lost connection to <%a>, reconnecting." Caqti_error.pp_uri uri) >>= fun () -> in_transaction := false; (match db#reset_start with | exception Pg.Error _ -> return false | true -> Int_hashtbl.clear prepare_cache; Pg_io.communicate db (fun () -> db#reset_poll) >|= (function | Error _ -> false | Ok () -> (try db#status = Pg.Ok with Pg.Error _ -> false)) | false -> return false) let rec retry_on_connection_error ?(n = 1) f = if !in_transaction then f () else (f () : (_, [> Caqti_error.call]) result future) >>= (function | Ok _ as r -> return r | Error (`Request_failed {Caqti_error.msg = Pg_msg (Postgresql.Connection_failure _); _}) as r when n > 0 -> reset () >>= fun reset_ok -> if reset_ok then retry_on_connection_error ~n:(n - 1) f else return r | Error _ as r -> return r) let query_oneshot ?params ?binary_params ?ensure_single_result query = retry_on_connection_error begin fun () -> return (send_query ?params ?binary_params query) end >>= function | Error _ as r -> return r | Ok () -> Pg_io.get_result ~uri ~query ?ensure_single_result db let query_prepared query_id prepared params = let {query; binary_params; _} = prepared in retry_on_connection_error begin fun () -> begin if Int_hashtbl.mem prepare_cache query_id then return (Ok()) else (match send_prepare query_id query with | Ok () -> Pg_io.get_result ~uri ~query db >|= (function | Ok result -> Pg_io.check_command_result ~uri ~query result | Error _ as r -> r) | Error _ as r -> return r) >|=? fun () -> Ok (Int_hashtbl.add prepare_cache query_id prepared) end >|=? fun () -> send_query_prepared ~params ~binary_params ~query ~query_id end >>=? fun () -> Pg_io.get_result ~uri ~query db module Response = struct type ('b, 'm) t = {row_type: 'b Caqti_type.t; result: Pg.result} let returned_count {result; _} = return (Ok result#ntuples) let affected_count {result; _} = return (Ok (int_of_string result#cmd_tuples)) let exec _ = return (Ok ()) let find {row_type; result} = return (decode_row ~uri (result, 0) row_type) let find_opt {row_type; result} = return begin if result#ntuples = 0 then Ok None else (match decode_row ~uri (result, 0) row_type with | Ok y -> Ok (Some y) | Error _ as r -> r) end let fold f {row_type; result} acc = let n = result#ntuples in let rec loop i acc = if i = n then Ok acc else (match decode_row ~uri (result, i) row_type with | Ok y -> loop (i + 1) (f y acc) | Error _ as r -> r) in return (loop 0 acc) let fold_s f {row_type; result} acc = let n = result#ntuples in let rec loop i acc = if i = n then return (Ok acc) else (match decode_row ~uri (result, i) row_type with | Ok y -> f y acc >>=? loop (i + 1) | Error _ as r -> return r) in loop 0 acc let iter_s f {row_type; result} = let n = result#ntuples in let rec loop i () = if i = n then return (Ok ()) else (match decode_row ~uri (result, i) row_type with | Ok y -> f y >>=? loop (i + 1) | Error _ as r -> return r) in loop 0 () let to_stream {row_type; result} = let n = result#ntuples in let rec f i () = if i = n then return Stream.Nil else (match decode_row ~uri (result, i) row_type with | Ok y -> return @@ Stream.Cons (y, f (i + 1)) | Error err -> return @@ Stream.Error err) in f 0 end let call ~f req param = using_db @@ fun () -> (* Prepare, if requested, and send the query. *) let param_type = Caqti_request.param_type req in (match Caqti_request.query_id req with | None -> let templ = Caqti_request.query req driver_info in let query = Pg_ext.query_string Db.db templ in let param_length = Caqti_type.length param_type in let binary_params = Array.make param_length false in let nbp = set_binary_params binary_params param_type 0 in assert (nbp = param_length); let params = Array.make param_length Pg.null in (match Param_encoder.encode ~uri params param_type param with | Ok () -> query_oneshot ~params ~binary_params query >|=? fun result -> Ok (query, result) | Error _ as r -> return r) | Some query_id -> let prepared = try Int_hashtbl.find prepare_cache query_id with | Not_found -> let templ = Caqti_request.query req driver_info in let query = Pg_ext.query_string Db.db templ in let param_length = Caqti_type.length param_type in let binary_params = Array.make param_length false in let nbp = set_binary_params binary_params param_type 0 in assert (nbp = param_length); {query; param_length; binary_params} in let params = Array.make prepared.param_length Pg.null in (match Param_encoder.encode ~uri params param_type param with | Ok () -> query_prepared query_id prepared params >|=? fun result -> Ok (prepared.query, result) | Error _ as r -> return r)) >>=? fun (query, result) -> (* Fetch and process the result. *) let row_type = Caqti_request.row_type req in let row_mult = Caqti_request.row_mult req in (match Pg_io.check_query_result ~uri ~query result row_mult with | Ok () -> f Response.{row_type; result} | Error _ as r -> return r) let deallocate req = (match Caqti_request.query_id req with | Some query_id -> if Int_hashtbl.mem prepare_cache query_id then begin let query = sprintf "DEALLOCATE _caq%d" query_id in query_oneshot query >|=? fun result -> Int_hashtbl.remove prepare_cache query_id; Pg_io.check_query_result ~uri ~query result Caqti_mult.zero end else return (Ok ()) | None -> failwith "deallocate called on oneshot request") let disconnect () = using_db @@ fun () -> try db#finish; return () with Pg.Error err -> Log.warn (fun p -> p "While disconnecting from <%a>: %s" Caqti_error.pp_uri uri (Pg.string_of_error err)) let validate () = using_db @@ fun () -> if (try db#status = Pg.Ok with Pg.Error _ -> false) then return true else reset () let check f = f (try db#status = Pg.Ok with Pg.Error _ -> false) let exec q p = call ~f:Response.exec q p let start () = exec start_req () >|=? fun () -> Ok (in_transaction := true) let commit () = in_transaction := false; exec commit_req () let rollback () = in_transaction := false; exec rollback_req () let populate ~table ~columns row_type data = let query = sprintf "COPY %s (%s) FROM STDIN WITH CSV" table (String.concat "," columns) in let param_length = Caqti_type.length row_type in let binary_params = Array.make param_length false in let nbp = set_binary_params binary_params row_type 0 in assert (nbp = param_length); let fail msg = return (Error (Caqti_error.request_failed ~uri ~query (Caqti_error.Msg msg))) in let pg_error msg = return (Error (Caqti_error.request_failed ~uri ~query (Pg_msg msg))) in let put_copy_data data = let rec loop fd = match db#put_copy_data data with | Pg.Put_copy_error -> fail "Unable to put copy data" | Pg.Put_copy_queued -> return (Ok ()) | Pg.Put_copy_not_queued -> Unix.poll ~write:true fd >>= fun _ -> loop fd in (match db#socket with | exception Pg.Error msg -> pg_error msg | socket -> Unix.wrap_fd loop (Obj.magic socket)) in let copy_row row = let params = Array.make param_length Pg.null in (match Copy_encoder.encode ~uri params row_type row with | Ok () -> return (Ok (String.concat "," (Array.to_list params))) | Error _ as r -> return r) >>=? fun param_string -> put_copy_data (param_string ^ "\n") in begin (* Send the copy command to start the transfer. * Skip checking that there is only a single result: while in copy mode * we can repeatedly get the latest result and it will always be * Copy_in, so checking for a single result would trigger an error. *) query_oneshot ~ensure_single_result:false query >>=? fun result -> (* We expect the Copy_in response only - turn other success responses * into errors, and delegate error handling. *) (match result#status with | Pg.Copy_in -> return (Ok ()) | Pg.Command_ok -> fail "Received Command_ok when expecting Copy_in" | _ -> return (Pg_io.check_command_result ~uri ~query result)) >>=? fun () -> System.Stream.iter_s ~f:copy_row data >>=? fun () -> (* End the copy *) let rec copy_end_loop fd = match db#put_copy_end () with | Pg.Put_copy_error -> fail "Unable to finalize copy" | Pg.Put_copy_not_queued -> Unix.poll ~write:true fd >>= fun _ -> copy_end_loop fd | Pg.Put_copy_queued -> return (Ok ()) in (match db#socket with | exception Pg.Error msg -> pg_error msg | socket -> Unix.wrap_fd copy_end_loop (Obj.magic socket)) >>=? fun () -> (* After ending the copy, there will be a new result for the initial * query. *) Pg_io.get_and_check_result ~uri ~query db end end let connect uri = return (Pg_ext.parse_uri uri) >>=? fun (conninfo, notice_processing) -> (match new Pg.connection ~conninfo () with | exception Pg.Error msg -> return (Error (Caqti_error.connect_failed ~uri (Pg_msg msg))) | db -> Pg_io.communicate db (fun () -> db#connect_poll) >|= (function | Error msg -> Error (Caqti_error.connect_failed ~uri (Pg_msg msg)) | Ok () -> (match db#status <> Pg.Ok with | exception Pg.Error msg -> Error (Caqti_error.connect_failed ~uri (Pg_msg msg)) | true -> let msg = db#error_message in Error (Caqti_error.connect_failed ~uri (Caqti_error.Msg msg)) | false -> db#set_notice_processing notice_processing; let module B = Make_connection_base (struct let uri = uri let db = db end) in let module Connection = struct let driver_info = driver_info include B include Caqti_connection.Make_convenience (System) (B) end in Ok (module Connection : CONNECTION)))) end let () = Caqti_connect.define_unix_driver "postgres" (module Connect_functor); Caqti_connect.define_unix_driver "postgresql" (module Connect_functor)
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