Source

amall / src / dbi / dbi_pg.ml

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open Am_All;
open Dbi_common;

module P = Postgresql;



type sql_u =
  [= `Null
  |  `String of string
  |  `Binary of string
  ]
;


type timestamptz = string
;


type sql_t =
  [= sql_u

  |  `Void

  |  `Bool of bool
  |  `Int of int      (* smallint *)
  |  `Int32 of int32  (* int, serial *)
  |  `Int64 of int64  (* bigint, bigserial *)
  |  `Num of Decimal.t  (* numeric, decimal *)

  |  `Date of string
  |  `Time of string
  |  `TimeTZ of string
  |  `Timestamp of string
  |  `TimestampTZ of timestamptz
  ]
;


type ident = string
;

type colnum = int
;

type rownum = int
;

type record =
  { rres : P.result
  ; rrow : rownum
  }
;

type record_type = P.result
;

type field_type = P.ftype
;

exception Efield of string
;

(* Etype of "expected type" and "got (type|null)" *)
exception Etype of string and string
;

type uncomp_getter 'a = Af2.af2 record_type record 'a
;

type comp_getter 'a = Af.af record 'a
;

type comp_typer 'a = int -> comp_getter 'a
;

type c_typeerror_wanted = [ CTW_Null | CTW_Not_null ]
;

type comp_typer2 'a =
  { c_notnull : comp_typer 'a
  ; c_nullable : comp_typer (option 'a)
  ; c_typeerror : c_typeerror_wanted -> ~got:string -> unit
  }
;

(*
type result_status =
  [= `Ok of [= `Cmd | `Data ]
  |  `Error of exn
  ]
;
*)


module G
 =
  struct

    value string x = x
    ;

    value number pres ~col =
      let fmod = pres#fmod col in
      if fmod = -1 then failwith "number: fmod = -1  =>  heeeelp!" else
      let (* _total_digits = (fmod lsr 16) land 0xFFFF
      and *) after_point_digits_4 = fmod land 0xFFFF in
      let scale = after_point_digits_4 - 4 in
      (* let () = failwith "WC.number: str=%S, scale=%i" str scale in *)
      fun str -> Decimal.of_string_scale str scale
    ;

    value int64 str =
      try
        Int64.of_string str
      with
      [ Failure "int_of_string" -> raise (Etype "int64" str)
      ]
    ;

    value int32 str =
      try
        Int32.of_string str
      with
      [ Failure "int_of_string" -> raise (Etype "int32" str)
      ]
    ;

    value int ty str =
      try
        int_of_string str
      with
      [ Failure "int_of_string" -> raise (Etype ty str)
      ]
    ;

    value bool str =
      match str with
      [ "t" -> True
      | "f" -> False
      | _ -> failwith "Dbi_pg: expected bool (t/f), found %S" str
      ]
    ;

  end
;


module C
 :
  sig
    value string : comp_typer2 string;
    value number : comp_typer2 Decimal.t;
    value int64 : comp_typer2 int64;
    value timestamptz : comp_typer2 timestamptz;
    value bool : comp_typer2 bool;
  end
 =
  struct

    value common get_it ~want_ftype =
      let want_ftype_notnull = want_ftype ^ " (not null)" in
      let typeerror ctw ~got =
        raise
          (Etype
             (match ctw with
              [ CTW_Null -> want_ftype
              | CTW_Not_null -> want_ftype_notnull
              ]
             )
             got
          )
      in
        { c_notnull = fun col -> fun record ->
            let pres = record.rres
            and row = record.rrow in
            if pres#getisnull row col
            then
              typeerror CTW_Not_null ~got:"NULL"
            else
              get_it pres ~row ~col
        ; c_nullable = fun col -> fun record ->
            let pres = record.rres
            and row = record.rrow in
            if pres#getisnull row col
            then
              None
            else
              Some (get_it pres ~row ~col)
        ; c_typeerror = typeerror
        }
    ;

    value get_as_string pres ~row ~col =
      G.string (pres#getvalue row col)
    ;

    value string = common
      ~want_ftype:"string"
      get_as_string
    ;

    value number = common
      ~want_ftype:"number (numeric, decimal)"
      (fun pres ~row ~col ->
         G.number pres ~col (pres#getvalue row col)
      )
    ;

    value int64 = common
      ~want_ftype:"int64 (bigint, bigserial)"
      (fun pres ~row ~col ->
         G.int64 (pres#getvalue row col)
      )
    ;

    value timestamptz = common
      ~want_ftype:"timestamp with time zone"
      get_as_string
    ;

    value bool = common
      ~want_ftype:"boolean"
      (fun pres ~row ~col ->
         G.bool (pres#getvalue row col)
      )
    ;

  end
;


value ( ( <*> ) :
  uncomp_getter ('a -> 'b) ->
  uncomp_getter 'a ->
  uncomp_getter 'b
  ) = Af2.( ( <*> ) )
;

value ( ( <$> ) :
  ('a -> 'b) ->
  uncomp_getter 'a ->
  uncomp_getter 'b
  ) = Af2.( ( <$> ) )
;

value pure = Af2.pure
;


value get_index record_type ident =
  try
    record_type#fnumber ident
  with
  [ Not_found ->
      raise (Efield (sprintf "by name: %s" ident))
  ]
;


value check_index record_type index =
  if index < 0 || index >= record_type#nfields
  then
    raise (Efield (sprintf "by index: %i" index))
  else
    index
;


type uncomp_typer2 'a =
  { utn : ident -> uncomp_getter 'a
  ; utno : ident -> uncomp_getter (option 'a)
  ; uti : int -> uncomp_getter 'a
  ; utio : int -> uncomp_getter (option 'a)
  }
;

value common compiled ~check_ftype =
  let
    { c_notnull = c_notnull
    ; c_nullable = c_nullable
    ; c_typeerror = c_typeerror
    } =
        compiled
  in
  let check_ty ctw record_type index =
    let ty = record_type#ftype index in
    if not (check_ftype ty)
    then
      c_typeerror ctw ~got:(P.string_of_ftype ty)
    else
      ()
  in
  { utn = fun ident -> fun record_type ->
      let index = get_index record_type ident in
      ( check_ty CTW_Not_null record_type index
      ; c_notnull index
      )
  ; utno = fun ident -> fun record_type ->
      let index = get_index record_type ident in
      ( check_ty CTW_Null record_type index
      ; c_nullable index
      )

  ; uti = fun index -> fun record_type ->
      let index = check_index record_type index in
      ( check_ty CTW_Not_null record_type index
      ; c_notnull index
      )
  ; utio = fun index -> fun record_type ->
      let index = check_index record_type index in
      ( check_ty CTW_Null record_type index
      ; c_nullable index
      )
  }
;

value string_check ftype =
  ftype = P.CHAR || ftype = P.TEXT || ftype = P.NAME || ftype = P.VARCHAR
(*
  match ftype with
  [ P.CHAR | P.TEXT | P.NAME | P.VARCHAR -> True
  | _ -> False
  ]
*)
;



(**************************************************************************)

value
  { utn = nstring ; utno = nstring_opt
  ; uti = istring ; utio = istring_opt
  } =
  common C.string ~check_ftype: string_check
;

value
  { utn = nnumber ; utno = nnumber_opt
  ; uti = inumber ; utio = inumber_opt
  } =
  common C.number ~check_ftype: ( (=) P.NUMERIC )
;

value
  { utn = nint64 ; utno = nint64_opt
  ; uti = iint64 ; utio = iint64_opt
  } =
  common C.int64 ~check_ftype: ( (=) P.INT8 )
;

value
  { utn = ntimestamptz ; utno = ntimestamptz_opt
  ; uti = itimestamptz ; utio = itimestamptz_opt
  } =
  common C.timestamptz ~check_ftype: ( (=) P.TIMESTAMPTZ )
;

value
  { utn = nbool ; utno = nbool_opt
  ; uti = ibool ; utio = ibool_opt
  } =
  common C.bool ~check_ftype: ( (=) P.BOOL )
;



(*
value (sql_t : record -> ~col:int -> sql_t) record ~col =
  let pres = record.rres in
  let row = record.rrow in
  if pres#getisnull row col
  then `Null
  else
    match record.rres#ftype col with
    [ P.CHAR | P.TEXT | P.NAME | P.VARCHAR ->
        `String (WC.string.c_notnull col record)
(*
    | P.BYTEA -> `Binary x
    | P.INT8 -> `Int64 (Int64.of_string x)
    | P.INT2 -> `Int (int_of_string x)
    | P.INT4 -> `Int32 (Int32.of_string x)
    | P.NUMERIC -> `Num ( (*Num.num_of_string x*) raise Exit )
    | P.VARCHAR -> `String x
    | P.DATE -> `Date x
    | P.TIME -> `Time x
    | P.TIMESTAMP -> `Timestamp x
    | P.TIMESTAMPTZ -> `TimestampTZ x
    | P.TIMETZ -> `TimeTZ x
    | P.BOOL -> `Bool
        (match x with
         [ "t" -> True | "f" -> False
         | _ -> failwith "bad boolean" ])
*)
    | P.BYTEA
    | P.CHAR
    | P.INT8
    | P.INT2
    | P.INT4
    | P.TEXT
    | P.NAME
    | P.NUMERIC
    | P.VARCHAR
    | P.DATE
    | P.TIME
    | P.TIMESTAMP
    | P.TIMESTAMPTZ
    | P.TIMETZ
    | P.BOOL

    | P.FLOAT8
    | P.INT2VECTOR
    | P.REGPROC
    | P.OID
    | P.TID
    | P.XID
    | P.CID
    | P.OIDVECTOR
    | P.POINT
    | P.LSEG
    | P.PATH
    | P.BOX
    | P.POLYGON
    | P.LINE
    | P.FLOAT4
    | P.ABSTIME
    | P.RELTIME
    | P.TINTERVAL
    | P.UNKNOWN
    | P.CIRCLE
    | P.CASH
    | P.MACADDR
    | P.INET
    | P.CIDR
    | P.ACLITEM
    | P.BPCHAR
    | P.INTERVAL
    | P.BIT
    | P.VARBIT
    | P.ANYELEMENT
    | P.OPAQUE
    | P.INTERNAL
    | P.LANGUAGE_HANDLER
    | P.TRIGGER
    | P.VOID
    | P.ANYARRAY
    | P.ANY
    | P.CSTRING
    | P.RECORD
    | P.REGTYPE
    | P.REGCLASS
    | P.REGOPERATOR
    | P.REGOPER
    | P.REGPROCEDURE
    | P.REFCURSOR

        as ty -> raise (Etype "get_t-supported" (P.string_of_ftype ty))
    ]
;
*)

(**************************************************************************)



value (compile_getter : record_type -> uncomp_getter 'a -> comp_getter 'a)
  rt ucg = Af2.run1 ucg rt
;



(**********************************************************************)


value nvl opt_new old =
  match opt_new with
  [ None -> old
  | Some the_new -> the_new
  ]
;


class conn_info
  ?host ?port ?dbname ?user ?password
  ?options ?requiressl ?tty
  ?conninfo
  ()
 =
  object (self)
    inherit Dbi.conn_info ?host ?port ?dbname ?user ?password ();

    method options : option string = options;
    method conninfo : option string = conninfo;
    method requiressl : option string = requiressl;
    method tty : option string = tty;

    method copy
      ?host ?port ?dbname ?user ?password
      ?options ?requiressl ?tty
      ?conninfo
      ()
     =
      new conn_info
        ?host:(nvl host self#host)
        ?port:(nvl port self#port)
        ?dbname:(nvl dbname self#dbname)
        ?user:(nvl user self#user)
        ?password:(nvl password self#password)
        ?options:(nvl options self#options)
        ?requiressl:(nvl requiressl self#requiressl)
        ?tty:(nvl tty self#tty)
        ?conninfo:(nvl conninfo self#conninfo)
        ()
    ;

  end
;


open Printf
;

open Am_Ops
;

exception Edbi = Dbi.Edbi
;

exception Prepare of string;
exception Bad_result_status of P.result_status;
exception Error_status of P.result_status and string;
exception Type_error of string and string;  (* typename and error *)

value string_of_dbd_error e =
  match e with
  [ P.Error error -> P.string_of_error error
  | Prepare msg -> msg
  | Bad_result_status rs -> "Bad result_status: " ^ P.result_status rs
  | Error_status rs msg ->
      sprintf "Error: %s: %s"
        (P.result_status rs)
        msg
  | Type_error tyname msg ->
      sprintf "Dbi_pg: error with type %S: %s" tyname msg
  | e ->   "Not a postgresql exception: "
         ^ Printexc.to_string e
         ^ "  (why is it here? possible internal error.)"
  ]
;


value (error : exn -> exn) e =
  Dbi.error (e, string_of_dbd_error)
;

value (perror : P.error -> exn) e = error & P.Error e
;

value (prepare_error : string -> exn) msg = error & Prepare msg
;

value (bad_result_status : P.result_status -> exn) rs =
  error & Bad_result_status rs
;

value (error_status : P.result_status -> string -> exn) rs msg =
  error & Error_status rs msg
;

value error_type tyname msg =
  error & Type_error tyname msg
;

value (error_type_not_sup : string -> exn) tyname =
  error_type tyname "not supported by bindings"
;

value error_type_conv tyname v msg =
  error_type tyname & sprintf "can't convert %S to this type: %s" v msg
;


(* засёк, 5 минут времени ровно. *)

value dump_sql_u = fun
  [  `Null -> "NULL"
  |  `String x -> sprintf "String %S" x
  |  `Binary x -> sprintf "Binary %S" x
  ]
;

value dump_sql_t = fun
  [  #sql_u as u -> dump_sql_u u
  |  `Bool x -> sprintf "Bool %b" x
  |  `Int x -> sprintf "Int %i" x
  |  `Int32 x -> sprintf "Int32 %li" x
  |  `Int64 x -> sprintf "Int64 %Li" x
  |  `Num x -> sprintf "Num %s" (Decimal.to_string x)
  |  `Date x -> sprintf "Date %S" x
  |  `Time x -> sprintf "Time %S" x
  |  `TimeTZ x -> sprintf "TimeTZ %S" x
  |  `Timestamp x -> sprintf "Timestamp %S" x
  |  `TimestampTZ x -> sprintf "TimestampTZ %S" x
  ]
;


value error_type_get tyname v =
  error_type tyname & sprintf "can't res#get_%s, column has value %s"
    tyname (dump_sql_t v)
;


value string_of_dbi_error = Dbi.string_of_dbi_error
;


value ok_cmd = `Ok `Cmd
  and ok_data = `Ok `Data
;


(*
type ident = string
;


type record_signature = P.result
;


type record =
  { rres : P.result
  ; rrow : int
  }
;


type colnum = int
;


type typer 'a 'r = record -> colnum -> ('a -> 'r) -> 'r
;
*)


(*
value entype_t' _presult _row _col : sql_t =
 let ftype = raise Exit and x = raise Exit and isnull = raise Exit in
  try
    let () = dbg "entype: %s = %S (is null = %b)"
      (P.string_of_ftype ftype) x isnull
    in
    if isnull then `Null else
    match ftype with
    [ P.BYTEA -> `Binary x
    | P.CHAR -> `String x
    | P.INT8 -> `Int64 (Int64.of_string x)
    | P.INT2 -> `Int (int_of_string x)
    | P.INT4 -> `Int32 (Int32.of_string x)
    | P.TEXT -> `String x
    | P.NAME -> `String x
    | P.NUMERIC -> `Num ( (*Num.num_of_string x*) raise Exit )
    | P.VARCHAR -> `String x
    | P.DATE -> `Date x
    | P.TIME -> `Time x
    | P.TIMESTAMP -> `Timestamp x
    | P.TIMESTAMPTZ -> `TimestampTZ x
    | P.TIMETZ -> `TimeTZ x
    | P.BOOL -> `Bool
        (match x with
         [ "t" -> True | "f" -> False
         | _ -> failwith "bad boolean"
         ]
        )
    | P.VOID -> `Void

    | P.FLOAT8
    | P.INT2VECTOR
    | P.REGPROC
    | P.OID
    | P.TID
    | P.XID
    | P.CID
    | P.OIDVECTOR
    | P.POINT
    | P.LSEG
    | P.PATH
    | P.BOX
    | P.POLYGON
    | P.LINE
    | P.FLOAT4
    | P.ABSTIME
    | P.RELTIME
    | P.TINTERVAL
    | P.UNKNOWN
    | P.CIRCLE
    | P.CASH
    | P.MACADDR
    | P.INET
    | P.CIDR
    | P.ACLITEM
    | P.BPCHAR
    | P.INTERVAL
    | P.BIT
    | P.VARBIT
    | P.ANYELEMENT
    | P.OPAQUE
    | P.INTERNAL
    | P.LANGUAGE_HANDLER
    | P.TRIGGER
    | P.ANYARRAY
    | P.ANY
    | P.CSTRING
    | P.RECORD
    | P.REGTYPE
    | P.REGCLASS
    | P.REGOPERATOR
    | P.REGOPER
    | P.REGPROCEDURE
    | P.REFCURSOR
        as ftype
        -> raise & error_type_not_sup & P.string_of_ftype ftype
    ]
  with
  [ (Type_error _ _) as te -> raise te
  | e -> raise & error_type_conv (P.string_of_ftype ftype) x &
           Printexc.to_string e
  ]
;


*)

value detype_t (v : sql_t) : sql_u =
  match v with
  [ (`Binary _) | (`String _) | `Null
      as v -> v

  | ( `Date x | `Time x | `Timestamp x
    | `TimestampTZ x | `TimeTZ x
    )
      -> `String x

  | `Void ->
      `String ""
         (* http://comments.gmane.org/gmane.comp.db.postgresql.
            devel.general/161403 *)

  | `Int64 i -> `String (Int64.to_string i)
  | `Int i -> `String (string_of_int i)
  | `Int32 i -> `String (Int32.to_string i)
  | `Num n -> `String (Decimal.to_string n)
  | `Bool b -> if b then `String "t" else `String "f"
  ]
;




value memo_last ?(cmp=Pervasives.compare) f =
  let last = ref None in
  fun x ->
    let recalc x =
      let v = f x in
      ( last.val := Some (x, v)
      ; v
      )
    in
    match last.val with
    [ None -> recalc x
    | Some (last_x, last_res) ->
        if cmp last_x x = 0
        then last_res
        else recalc x
    ]
;


class result_data
  (presult : P.result) =
  let names_lazy = lazy presult#get_fnames in
  let nrows = presult#ntuples in
  let some_nrows = Some nrows in
  object (self)
(*
    inherit Dbi.result ['v];
*)

    value mutable v_current_nrow = 0;

    method nrows = some_nrows;
    method names = Lazy.force names_lazy;
    method ncols = presult#nfields;

(*
    method enum_records it =
      .
    ;
*)

(*
    method current_nrow = v_current_nrow;
    method current_row = memd_row v_current_nrow
    ;
    method is_eor = (v_current_nrow >= presult#ntuples)
    ;

(*
    method next_row () =
      if self#is_eor
      then
        False
      else
        ( v_current_nrow := v_current_nrow + 1
        ; not self#is_eor
        )
    ;

    method current_row_typed = memd_row_typed v_current_nrow
    ;

    method! fetchrow_array () : array 'v =
      if self#is_eor
      then
        Dbi.error_eor ()
      else
        let res = self#current_row_typed in
        let _ : bool = self#next_row () in
        res
    ;
*)

    method private get_t colnum =
     if self#is_eor
     then
      Dbi.error_eor ()
     else
      let row = self#current_row_typed in
      let len = Array.length row in
      if colnum < 0 || colnum >= len
      then Dbi.error_column & sprintf
        "tried to get column %i while there are %i columns"
        colnum len
      else row.(colnum)
    ;

    method get_int64 colnum =
      match self#get_t colnum with
      [ `Int64 x -> x
      | x -> raise & error_type_get "int64" x
      ]
    ;

    method get_string colnum =
      match self#get_t colnum with
      [ `String x -> x
      | x -> raise & error_type_get "string" x
      ]
    ;
*)

    method iter_uc ug =
      let record_type = presult in
      let cg = compile_getter record_type ug in
      let ntup = presult#ntuples in
      let rec inner i =
        if i = ntup
        then ()
        else
          let record = { rres = presult ; rrow = i } in
          ( let () = Af.run cg record in inner (i + 1) )
      in
        inner 0
    ;


    method map_to_list : !'a. uncomp_getter 'a -> list 'a = fun f ->
      let rev_acc = ref [] in
      let () = self#iter_uc
        ( Af2.(<$>)
          (fun r -> rev_acc.val := [r :: rev_acc.val])
          f
        ) in
      List.rev rev_acc.val
    ;


    method iter_t : (array sql_t -> unit) -> unit = fun f ->
      let ntup = presult#ntuples in
      if ntup = 0
      then
        ()
      else
        let nfields = presult#nfields in
        let mappers = Array.init nfields
          (fun i ->
             match presult#ftype i with
             [ P.BYTEA -> fun x -> `Binary x
             | P.CHAR
             | P.TEXT
             | P.NAME
             | P.VARCHAR
                 -> fun x -> `String x
             | P.INT8 -> fun x -> `Int64 (G.int64 x)
             | P.INT2 -> fun x -> `Int (G.int "int2" x)
             | P.INT4 -> fun x -> `Int32 (G.int32 x)
             | P.NUMERIC ->
                 let f = G.number presult ~col:i
                 in fun x -> `Num (f x)
             | P.DATE -> fun x -> `Date x
             | P.TIME -> fun x -> `Time x
             | P.TIMESTAMP -> fun x -> `Timestamp x
             | P.TIMESTAMPTZ -> fun x -> `TimestampTZ x
             | P.TIMETZ -> fun x -> `TimeTZ x
             | P.BOOL -> fun x -> `Bool (G.bool x)
             | P.VOID -> fun _ -> `Void

             | P.FLOAT8
             | P.INT2VECTOR
             | P.REGPROC
             | P.OID
             | P.TID
             | P.XID
             | P.CID
             | P.OIDVECTOR
             | P.POINT
             | P.LSEG
             | P.PATH
             | P.BOX
             | P.POLYGON
             | P.LINE
             | P.FLOAT4
             | P.ABSTIME
             | P.RELTIME
             | P.TINTERVAL
             | P.UNKNOWN
             | P.CIRCLE
             | P.CASH
             | P.MACADDR
             | P.INET
             | P.CIDR
             | P.ACLITEM
             | P.BPCHAR
             | P.INTERVAL
             | P.BIT
             | P.VARBIT
             | P.ANYELEMENT
             | P.OPAQUE
             | P.INTERNAL
             | P.LANGUAGE_HANDLER
             | P.TRIGGER
             | P.ANYARRAY
             | P.ANY
             | P.CSTRING
             | P.RECORD
             | P.REGTYPE
             | P.REGCLASS
             | P.REGOPERATOR
             | P.REGOPER
             | P.REGPROCEDURE
             | P.REFCURSOR
                 as ftype
                 -> raise & error_type_not_sup & P.string_of_ftype ftype
             ]
          )
        in
        let getvalue = presult#getvalue
        and getisnull = presult#getisnull
        in
        let rec inner i =
          if i = ntup
          then ()
          else
            let record = Array.mapi
              (fun j mapper ->
                 if getisnull i j
                 then `Null
                 else mapper (getvalue i j)
              )
              mappers
            in
            let () = f record in
            inner (i + 1)
        in
          inner 0
    ;


    method map_t_to_list : !'a. (array sql_t -> 'a) -> list 'a = fun f ->
      let rev_acc = ref [] in
      let () = self#iter_t
        (fun row ->
          rev_acc.val := [(f row) :: rev_acc.val]
        )
      in
      List.rev rev_acc.val
    ;


(*
    method fetchall_array () : array (array sql_t) = [| [|  |] |];
    method fetchall_list () : list (array sql_t) = [ [| |] ];
    method fetchrow sql_t = [| |];
*)

  end
;


class result_cmd (presult : P.result) =
  object (_self)
    method affected = presult#cmd_tuples;
  end
;


type result =
  [= `Data of result_data
  |  `Cmd of result_cmd
  |  `Error of exn
  ]
;

value expect_result_data
 : result -> result_data
 = fun
  [ `Data d -> d
  | `Cmd _ -> failwith "Dbi_pg.expect_result_data: result is `Cmd"
  | `Error e -> raise e
  ]
;


value make_result presult : result =
  match presult#status with
  [ P.Command_ok -> `Cmd (new result_cmd presult)
  | P.Tuples_ok -> `Data (new result_data presult)
  | ( P.Fatal_error | P.Nonfatal_error ) as rs ->
      `Error (error_status rs (presult#error))
  | ( P.Empty_query | P.Copy_in | P.Copy_out | P.Bad_response
    ) as rs ->
      `Error (bad_result_status rs)
  ]
;


value cmd_ok r =
  match r with
  [ `Cmd _ -> ()
  | `Data _ -> failwith "cmd_ok: unexpected data result"
  | `Error e -> raise e
  ]
;


value convert_in_params
(params : array sql_t) =
  let len = Array.length params in
  let string_params = Array.make len ""
  and binary_params = Array.make len True in
  let () =
    for i = 0 to len-1
    do
      match detype_t params.(i) with
      [ `Null ->
           ( string_params.(i) := P.null
           ; binary_params.(i) := False
           )
      | `String str ->
           ( string_params.(i) := str
           ; binary_params.(i) := False
           )
      | `Binary str ->
           ( string_params.(i) := (*pcon#escape_bytea*) str
           ; binary_params.(i) := True
           )
      ]
    done
  in
    (string_params, binary_params)
;


class connection_gen conn_info =
  object (self)
(*
    inherit Dbi.connection
      [sql_t, sql_t, s-tatement sql_t sql_t result, result]
      (conn_info :> Dbi.conn_info) as super;
*)

    value mutable con =
      try
        some & new P.connection
          ?host : conn_info#host
          ?port : conn_info#port
          ?dbname : conn_info#dbname
          ?user : conn_info#user
          ?password : conn_info#password
          ?options : conn_info#options
          ?tty : conn_info#tty
          ?requiressl : conn_info#requiressl
          ?conninfo : conn_info#conninfo
          ()
      with
      [ P.Error e -> raise & perror e ]
    ;

    method private with_con : !'a. (P.connection -> 'a) -> 'a =
     fun func ->
      match con with
      [ None -> Dbi.error_connection_closed "postgresql"
      | Some con -> func con
      ]
    ;

    method disconnect () =
      self#with_con & fun pcon ->
      try
        ( pcon#finish
        ; con := None
        )
      with
      [ P.Error e -> raise & perror e ]
    ;

    value next_stm_name =
      let c = ref 0 in fun () ->
      ( incr c
      ; Printf.sprintf "stm%i" c.val
      )
    ;

    method prepare sql = self#with_con & fun pcon ->
      let stm_name = next_stm_name () in
      let presult = pcon#prepare stm_name sql in
      if presult#status <> P.Command_ok
      then
        raise & prepare_error presult#error
      else
        new statement stm_name self#with_con
    ;

    (* _p = positional bindings *)
    method execute_p sql params = self#with_con & fun pcon ->
      let (string_params, binary_params) =
        convert_in_params params in
      make_result (pcon#exec
        ~params:string_params ~binary_params sql)
    ;

    (* no bindings, typed results *)
    method execute sql = self#with_con & fun pcon ->
      make_result (pcon#exec sql)
    ;

    method start () = cmd_ok & self#execute "start transaction";

    method commit () = cmd_ok & self#execute "commit";

    method rollback () = cmd_ok & self#execute "rollback";

    method quote str = self#with_con & fun con ->
      "'" ^ con#escape_string ~pos:0 str ^ "'"
    ;

    method quote_ident str = self#with_con & fun con ->
      con#escape_string ~pos:0 str
    ;

  end

and

statement
(stm_name : string) meth_with_con =
  object

(*
    inherit Dbi.statement ['v, 'p, 'res];
*)

    method execute () =
      ( (meth_with_con : (P.connection -> 'q) -> 'q) & fun pcon ->
           make_result (pcon#exec_prepared stm_name)
      )
    ;

    (* execute prepared statement with "_p"ositional parameters *)
    method execute_p params =
      ( meth_with_con & fun pcon ->
          let (string_params, binary_params) =
            convert_in_params params in
          make_result (pcon#exec_prepared
            ~params:string_params ~binary_params stm_name)
      )
    ;

    (* will be implemented as "cleaning prepared statement"
       when postgresql-ocaml will provide such functionality. *)
    method finish () = ()
    ;

  end
;


class connection conn_info =
  connection_gen conn_info
;


value with_connection conn_info func =
  let con = new connection conn_info in
  let finally () =
    try con#disconnect () with [ _ -> () ] in
  try
    let r = func con in
    ( finally ()
    ; r
    )
  with
  [ e -> (finally (); raise e)
  ]
;


value pgpass_escape field =
  let buf = Buffer.create 8 in
  ( for i = 0 to String.length field - 1
    do
      let c = field.[i] in
      ( if c = ':' || c = '\\'
        then Buffer.add_char buf '\\'
        else ()
      ; Buffer.add_char buf c
      )
    done
  ; Buffer.contents buf
  )
;


exception Pgpass of string
;


open Res
;


value pgpass_line conn_info =
  let f title opt_val =
    match opt_val with
    [ None -> fail & sprintf "field %S not defined" title
    | Some x -> return x
    ]
  and fany opt_val =
    return &
    match opt_val with
    [ None -> "*"
    | Some x -> x
    ]
  in
  catch (fun () ->
    f "host" conn_info#host >>= fun host ->
    f "port" conn_info#port >>= fun port ->
    fany conn_info#dbname >>= fun dbname ->
    f "user" conn_info#user >>= fun user ->
    f "password" conn_info#password >>= fun password ->
    let e () str = pgpass_escape str in
      return &
        sprintf "%a:%a:%a:%a:%a"
          e host e port e dbname e user e password
  )
  (fun e -> fail &
     sprintf "can't make .pgpass-line: %s" e
  )
;


value pgpass_fname () =
  match Sys.os_type with
  [ "Unix" ->
      return &
      ( Filename.concat
          (Sys.getenv "HOME")
          ".pgpass"
      , None
      )
  | "Win32" ->
      return &
        let dir =
          Filename.concat
            (Sys.getenv "APPDATA")
            "postgresql"
        in
        let fn = Filename.concat dir "pgpass.conf" in
        (fn, Some dir)
  | o ->
      fail (Pgpass (sprintf "pgpass_fname: os_type %S not supported" o))
  ]  
;


value append_to_pgpass_line line =
  pgpass_fname () >>= fun (fname, opt_dir) ->
  res_exn & fun () ->
    ( match opt_dir with
      [ None -> ()
      | Some dir ->
          match 
            try some & Sys.is_directory dir with [ Sys_error _ -> None ]
          with
          [ None ->  (* no file / no dir *)
              Unix.mkdir dir 0o600
          | Some True ->  (* directory *)
              ()
          | Some False ->  (* file *)
              failwith "%S shouldn't be a file" dir
          ]
      ]
    ;
      Filew.with_file_out_gen
        [Open_append; Open_creat; Open_binary] 0o600 fname &
      fun outch ->
        fprintf outch "%s\n%!" line
    )
;


value append_to_pgpass (conn_info : conn_info) =
  map_err (fun msg -> Pgpass msg)
  (pgpass_line conn_info)
  >>= fun line ->
  append_to_pgpass_line line
;


(***********************************************************)

(*
module Record_typing
 =
  struct
    open Af2;

    type record_processor 'a = af2 record_signature (array string) 'a;

  end
;
*)


value connection_eq (c1 : connection) (c2 : connection) = (c1 == c2)
;


open WithM.WithI
;

value withres_stmt : withres (connection * string) (statement)
=
  { cons = fun (conn, sql) -> conn#prepare sql
  ; fin = fun stmt -> stmt#finish ()
  }
;
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Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.