2022-09-20 11:13:46 +00:00
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module Store = Git.Mem.Make(Digestif.SHA1)
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module Sync = Git.Mem.Sync(Store)
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module Search = Git.Search.Make(Digestif.SHA1)(Store)
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module Git_commit = Git.Commit.Make(Store.Hash)
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type t = {
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ctx : Mimic.ctx ;
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edn : Smart_git.Endpoint.t;
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branch : Git.Reference.t ;
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store : Store.t ;
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mutable head : Store.hash option ;
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}
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let init_store () =
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let open Lwt.Infix in
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Store.v (Fpath.v ".") >|= fun r ->
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Result.map_error
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(fun e -> `Msg (Fmt.str "error setting up store %a" Store.pp_error e))
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r
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let main = Git.Reference.v "refs/heads/main"
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let capabilities =
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[ `Side_band_64k; `Multi_ack_detailed; `Ofs_delta; `Thin_pack; `Report_status ]
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let to_invalid = function
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| Ok x -> x
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| Error `Msg m -> invalid_arg m
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let split_url s =
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match String.split_on_char '#' s with
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| [ edn; branch ] ->
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Smart_git.Endpoint.of_string edn |> to_invalid,
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Git.Reference.of_string branch |> to_invalid
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| _ ->
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Smart_git.Endpoint.of_string s |> to_invalid, main
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let pull t =
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let open Lwt.Infix in
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Sync.fetch ~capabilities ~ctx:t.ctx t.edn t.store ~deepen:(`Depth 1) `All >>= fun r ->
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let data =
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Result.map_error
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(fun e -> `Msg (Fmt.str "error fetching: %a" Sync.pp_error e))
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r
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in
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match data with
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| Error _ as e -> Lwt.return e
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| Ok None -> Lwt.return (Ok [])
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| Ok Some (_, _) ->
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Store.Ref.resolve t.store t.branch >>= fun r ->
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let head =
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Result.map_error
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(fun e -> `Msg (Fmt.str "error resolving branch %s: %a"
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(Git.Reference.to_string t.branch)
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Store.pp_error e))
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r |> to_invalid
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in
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t.head <- Some head;
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Lwt.return (Ok [])
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let connect ctx endpoint =
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let open Lwt.Infix in
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init_store () >>= fun store ->
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let store = to_invalid store in
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let edn, branch = split_url endpoint in
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let t = { ctx ; edn ; branch ; store ; head = None } in
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pull t >>= fun r ->
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let _r = to_invalid r in
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Lwt.return t
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type key = Mirage_kv.Key.t
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type change = [
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| `Add of key
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| `Remove of key
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| `Change of key
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]
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let pull _ = assert false
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type error = Mirage_kv.error
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let pp_error ppf = Mirage_kv.pp_error ppf
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let disconnect _t = Lwt.return_unit
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let to_octets t =
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(* TODO maybe preserve edn and branch as well? *)
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let open Lwt.Infix in
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match t.head with
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| None -> Lwt.return ""
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| Some head ->
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Store.read_exn t.store head >|= function
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| Commit c ->
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let l = Encore.to_lavoisier Git_commit.format in
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Encore.Lavoisier.emit_string c l
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| _ -> assert false
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let of_octets ctx ~remote data =
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(* TODO maybe recover edn and branch from data as well? *)
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let open Lwt_result.Infix in
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let l = Encore.to_angstrom Git_commit.format in
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Lwt.return
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(Result.map_error (fun e -> `Msg e)
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(Angstrom.parse_string ~consume:All l data)) >>= fun head ->
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let head = Git_commit.tree head in
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init_store () >|= fun store ->
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let edn, branch = split_url remote in
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{ ctx ; edn ; branch ; store ; head = Some head }
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let exists _t _key =
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(* Search.find t.store t.head (`Path (Mirage_kv.Key.segments key)) >>= function *)
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(* ([`Value | `Dictionary] option, error) result Lwt.t *)
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assert false
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let get t key =
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let open Lwt.Infix in
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match t.head with
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| None -> Lwt.return (Error (`Not_found key))
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| Some head ->
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Search.find t.store head (`Path (Mirage_kv.Key.segments key)) >>= function
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| None -> Lwt.return (Error (`Not_found key))
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| Some blob ->
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Store.read_exn t.store blob >|= function
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| Blob b -> Ok (Git.Blob.to_string b)
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| _ -> assert false
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let get_partial t key ~offset ~length =
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let open Lwt_result.Infix in
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get t key >|= fun data ->
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if String.length data < offset then
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""
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else
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let l = min length (String.length data - offset) in
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String.sub data offset l
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let list _t _key =
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(* ((string * [`Value | `Dictionary]) list, error) result Lwt.t *)
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assert false
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let last_modified t key =
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let open Lwt.Infix in
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Option.fold
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~none:(Lwt.return (Error (`Not_found key)))
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~some:(fun head ->
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Store.read_exn t.store head >|= function
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| Commit c ->
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let author = Git_commit.author c in
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let secs, tz_offset = author.Git.User.date in
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let secs =
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Option.fold ~none:secs
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~some:(fun { Git.User.sign ; hours ; minutes } ->
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let tz_off = Int64.(mul (add (mul (of_int hours) 60L) (of_int minutes)) 60L) in
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match sign with
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| `Plus -> Int64.(sub secs tz_off)
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| `Minus -> Int64.(add secs tz_off))
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tz_offset
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in
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let ts =
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Option.fold ~none:Ptime.epoch ~some:Fun.id (Ptime.of_float_s (Int64.to_float secs))
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in
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Ok (Ptime.(Span.to_d_ps (to_span ts)))
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| _ -> assert false)
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t.head
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let digest t key =
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Option.fold
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~none:(Error (`Not_found key))
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~some:(fun x -> Ok (Store.Hash.to_hex x))
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t.head |> Lwt.return
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let size t key =
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let open Lwt_result.Infix in
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get t key >|= fun data ->
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String.length data
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