Source file store.ml
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open! Import
include Store_intf
module Maker (Config : Conf.S) = struct
type endpoint = unit
include Pack_key.Store_spec
module Make (Schema : Irmin.Schema.Extended) = struct
open struct
module P = Schema.Path
module M = Schema.Metadata
module C = Schema.Contents
module B = Schema.Branch
end
module H = Schema.Hash
module Io = Io.Unix
module Index = Pack_index.Make (H)
module Errs = Io_errors.Make (Io)
module File_manager = File_manager.Make (Io) (Index) (Errs)
module Dict = File_manager.Dict
module Dispatcher = Dispatcher.Make (File_manager)
module XKey = Pack_key.Make (H)
module X = struct
module Hash = H
type 'a value = { hash : H.t; kind : Pack_value.Kind.t; v : 'a }
[@@deriving irmin]
module Contents = struct
module Pack_value = Pack_value.Of_contents (Config) (H) (XKey) (C)
module CA =
Pack_store.Make (File_manager) (Dispatcher) (H) (Pack_value) (Errs)
include Irmin.Contents.Store_indexable (CA) (H) (C)
end
module Node = struct
module Value = Schema.Node (XKey) (XKey)
module CA = struct
module Inter =
Irmin_pack.Inode.Make_internal (Config) (H) (XKey) (Value)
module Pack' =
Pack_store.Make (File_manager) (Dispatcher) (H) (Inter.Raw) (Errs)
include Inode.Make_persistent (H) (Value) (Inter) (Pack')
end
include
Irmin.Node.Generic_key.Store (Contents) (CA) (H) (CA.Val) (M) (P)
end
module Node_portable = Node.CA.Val.Portable
module Schema = struct
include Schema
module Node = Node
end
module Commit = struct
module Value = struct
include Schema.Commit (Node.Key) (XKey)
module Info = Schema.Info
type hash = Hash.t [@@deriving irmin]
end
module Pack_value = Pack_value.Of_commit (H) (XKey) (Value)
module CA =
Pack_store.Make (File_manager) (Dispatcher) (H) (Pack_value) (Errs)
include
Irmin.Commit.Generic_key.Store (Schema.Info) (Node) (CA) (H) (Value)
end
module Commit_portable = struct
module Hash_key = Irmin.Key.Of_hash (Hash)
include Schema.Commit (Hash_key) (Hash_key)
let of_commit : Commit.Value.t -> t =
fun t ->
let info = Commit.Value.info t
and node = Commit.Value.node t |> XKey.to_hash
and parents = Commit.Value.parents t |> List.map XKey.to_hash in
v ~info ~node ~parents
module Info = Schema.Info
type hash = Hash.t [@@deriving irmin]
end
module Branch = struct
module Key = B
module Val = XKey
module AW = Atomic_write.Make_persistent (Io) (Key) (Val)
include Atomic_write.Closeable (AW)
let v ?fresh ?readonly path =
AW.v ?fresh ?readonly path >|= make_closeable
end
module Slice = Irmin.Backend.Slice.Make (Contents) (Node) (Commit)
module Remote = Irmin.Backend.Remote.None (Commit.Key) (B)
module Gc = Gc.Make (struct
module Async = Async.Unix
module Fm = File_manager
module Errs = Errs
module Dict = Dict
module Dispatcher = Dispatcher
module Hash = Schema.Hash
module Contents_store = Contents.CA
module Node_value = Node.CA.Inter.Val
module Node_store = Node.CA
module Commit_value = Commit.Value
module Commit_store = Commit.CA
type hash = Node_value.hash
type key = Node_value.node_key [@@deriving irmin]
end)
module Repo = struct
type running_gc = { gc : Gc.t; use_auto_finalisation : bool }
type t = {
lru : Lru.t;
config : Irmin.Backend.Conf.t;
contents : read Contents.CA.t;
node : read Node.CA.t;
commit : read Commit.CA.t;
branch : Branch.t;
fm : File_manager.t;
dict : Dict.t;
dispatcher : Dispatcher.t;
mutable during_batch : bool;
mutable running_gc : running_gc option;
}
let pp_key = Irmin.Type.pp XKey.t
let contents_t t : 'a Contents.t = t.contents
let node_t t : 'a Node.t = (contents_t t, t.node)
let commit_t t : 'a Commit.t = (node_t t, t.commit)
let branch_t t = t.branch
let config t = t.config
let v config =
let root = Irmin_pack.Conf.root config in
let fresh = Irmin_pack.Conf.fresh config in
let fm =
let readonly = Irmin_pack.Conf.readonly config in
if readonly then File_manager.open_ro config |> Errs.raise_if_error
else
match (Io.classify_path root, fresh) with
| `No_such_file_or_directory, _ ->
File_manager.create_rw ~overwrite:false config
|> Errs.raise_if_error
| `Directory, true ->
File_manager.create_rw ~overwrite:true config
|> Errs.raise_if_error
| `Directory, false ->
File_manager.open_rw config |> Errs.raise_if_error
| (`File | `Other), _ -> Errs.raise_error (`Not_a_directory root)
in
let dict = File_manager.dict fm in
let dispatcher = Dispatcher.v fm |> Errs.raise_if_error in
let lru = Lru.create config in
let contents = Contents.CA.v ~config ~fm ~dict ~dispatcher ~lru in
let node = Node.CA.v ~config ~fm ~dict ~dispatcher ~lru in
let commit = Commit.CA.v ~config ~fm ~dict ~dispatcher ~lru in
let+ branch =
let root = Conf.root config in
let fresh = Conf.fresh config in
let readonly = Conf.readonly config in
let path = Irmin_pack.Layout.V4.branch ~root in
Branch.v ~fresh ~readonly path
in
let during_batch = false in
let running_gc = None in
{
config;
contents;
node;
commit;
branch;
fm;
dict;
during_batch;
running_gc;
dispatcher;
lru;
}
let flush t = File_manager.flush ?hook:None t.fm |> Errs.raise_if_error
let fsync t = File_manager.fsync t.fm |> Errs.raise_if_error
let reload t = File_manager.reload t.fm |> Errs.raise_if_error
module Gc = struct
let is_allowed { fm; _ } = File_manager.gc_allowed fm
let behaviour { fm; _ } = File_manager.gc_behaviour fm
let cancel t =
match t.running_gc with
| Some { gc; _ } ->
let cancelled = Gc.cancel gc in
t.running_gc <- None;
cancelled
| None -> false
let direct_commit_key t key =
let state : _ Pack_key.state = Pack_key.inspect key in
match state with
| Direct _ -> Ok key
| Indexed h -> (
match Commit.CA.index_direct_with_kind t.commit h with
| None ->
Error
(`Commit_key_is_dangling
(Irmin.Type.to_string XKey.t key))
| Some (k, _kind) -> Ok k)
let start ~unlink ~use_auto_finalisation ~output t commit_key =
let open Result_syntax in
[%log.info "GC: Starting on %a" pp_key commit_key];
let* () =
if t.during_batch then Error `Gc_forbidden_during_batch else Ok ()
in
let* commit_key = direct_commit_key t commit_key in
let root = Conf.root t.config in
let* () =
if not (is_allowed t) then
Error (`Gc_disallowed "Store does not support GC")
else Ok ()
in
let current_generation = File_manager.generation t.fm in
let next_generation = current_generation + 1 in
let lower_root = Conf.lower_root t.config in
let* gc =
Gc.v ~root ~lower_root ~generation:next_generation ~unlink
~dispatcher:t.dispatcher ~fm:t.fm ~contents:t.contents
~node:t.node ~commit:t.commit ~output commit_key
in
t.running_gc <- Some { gc; use_auto_finalisation };
Ok ()
let start_exn ?(unlink = true) ?(output = `Root)
~use_auto_finalisation t commit_key =
match t.running_gc with
| Some _ ->
[%log.info "Repo is alreadying running GC. Skipping."];
Lwt.return false
| None -> (
let result =
start ~unlink ~use_auto_finalisation ~output t commit_key
in
match result with
| Ok _ -> Lwt.return true
| Error e -> Errs.raise_error e)
let finalise_exn ?(wait = false) t =
let* result =
match t.running_gc with
| None -> Lwt.return_ok `Idle
| Some { gc; _ } ->
if t.during_batch then
Lwt.return_error `Gc_forbidden_during_batch
else Gc.finalise ~wait gc
in
match result with
| Ok (`Finalised _ as x) ->
t.running_gc <- None;
Lwt.return x
| Ok waited -> Lwt.return waited
| Error e ->
t.running_gc <- None;
Errs.raise_error e
let is_finished t = Option.is_none t.running_gc
let on_finalise t f =
match t.running_gc with
| None -> ()
| Some { gc; _ } -> Gc.on_finalise gc f
let try_auto_finalise_exn t =
match t.running_gc with
| None | Some { use_auto_finalisation = false; _ } ->
Lwt.return_unit
| Some { use_auto_finalisation = true; _ } ->
let* _ = finalise_exn ~wait:false t in
Lwt.return_unit
let latest_gc_target t =
let pl = File_manager.(Control.payload (control t.fm)) in
match pl.status with
| From_v1_v2_post_upgrade _ | Used_non_minimal_indexing_strategy
| No_gc_yet ->
None
| T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9 | T10 | T11 | T12 | T13
| T14 | T15 ->
assert false
| Gced { latest_gc_target_offset = offset; _ }
when offset = Int63.zero ->
None
| Gced { latest_gc_target_offset = offset; _ } -> (
let entry =
Commit.CA.read_and_decode_entry_prefix ~off:offset
t.dispatcher
in
match Commit.CA.Entry_prefix.total_entry_length entry with
| None ->
assert false
| Some length ->
let key = Pack_key.v_direct ~offset ~length entry.hash in
Some key)
let create_one_commit_store t commit_key path =
let () =
match Io.classify_path path with
| `Directory -> ()
| `No_such_file_or_directory ->
Io.mkdir path |> Errs.raise_if_error
| _ -> Errs.raise_error `Invalid_layout
in
let commit_key =
direct_commit_key t commit_key |> Errs.raise_if_error
in
let* launched =
start_exn ~use_auto_finalisation:false ~output:(`External path) t
commit_key
in
let () =
if not launched then Errs.raise_error `Forbidden_during_gc
in
let* gced =
match t.running_gc with
| None -> assert false
| Some { gc; _ } -> Gc.finalise_without_swap gc
in
let config = Irmin.Backend.Conf.add t.config Conf.Key.root path in
let () =
File_manager.create_one_commit_store t.fm config gced commit_key
|> Errs.raise_if_error
in
let branch_path = Irmin_pack.Layout.V4.branch ~root:path in
let* branch_store =
Branch.v ~fresh:true ~readonly:false branch_path
in
let* () = Branch.close branch_store in
Lwt.return_unit
end
let is_split_allowed = Gc.is_allowed
let split t =
let open Result_syntax in
let readonly = Irmin_pack.Conf.readonly t.config in
let* () =
if not (is_split_allowed t) then Error `Split_disallowed else Ok ()
in
let* () = if readonly then Error `Ro_not_allowed else Ok () in
let* () =
if t.during_batch then Error `Split_forbidden_during_batch
else Ok ()
in
File_manager.split t.fm
let split_exn repo = split repo |> Errs.raise_if_error
let add_volume_exn t =
let () =
if Irmin_pack.Conf.readonly t.config then
Errs.raise_error `Ro_not_allowed;
if Gc.is_finished t = false then
Errs.raise_error `Add_volume_forbidden_during_gc
in
File_manager.add_volume t.fm |> Errs.raise_if_error
let batch t f =
[%log.debug "[pack] batch start"];
let readonly = Irmin_pack.Conf.readonly t.config in
if readonly then Errs.raise_error `Ro_not_allowed
else
let c0 = Mtime_clock.counter () in
let try_finalise () = Gc.try_auto_finalise_exn t in
let* _ = try_finalise () in
t.during_batch <- true;
let contents = Contents.CA.cast t.contents in
let node = Node.CA.Pack.cast t.node in
let commit = Commit.CA.cast t.commit in
let contents : 'a Contents.t = contents in
let node : 'a Node.t = (contents, node) in
let commit : 'a Commit.t = (node, commit) in
let on_success res =
let s = Mtime_clock.count c0 |> Mtime.span_to_s in
[%log.info "[pack] batch completed in %.6fs" s];
t.during_batch <- false;
File_manager.flush t.fm |> Errs.raise_if_error;
let* _ = try_finalise () in
Lwt.return res
in
let on_fail exn =
t.during_batch <- false;
[%log.info
"[pack] batch failed. calling flush. (%s)"
(Printexc.to_string exn)];
let () =
match File_manager.flush t.fm with
| Ok () -> ()
| Error err ->
[%log.err
"[pack] batch failed and flush failed. Silencing flush \
fail. (%a)"
(Irmin.Type.pp Errs.t) err]
in
raise exn
in
Lwt.try_bind (fun () -> f contents node commit) on_success on_fail
let close t =
let _ = Gc.cancel t in
let () = File_manager.close t.fm |> Errs.raise_if_error in
Branch.close t.branch >>= fun () ->
Contents.CA.close (contents_t t) >>= fun () ->
Node.CA.close (snd (node_t t)) >>= fun () ->
Commit.CA.close (snd (commit_t t))
end
end
include Irmin.Of_backend (X)
module Integrity_checks = Checks.Integrity_checks (XKey) (X) (Index)
let integrity_check_inodes ?heads t =
let* heads =
match heads with None -> Repo.heads t | Some m -> Lwt.return m
in
let hashes = List.map (fun x -> `Commit (Commit.key x)) heads in
let iter ~pred_node ~node ~commit t =
Repo.iter ~cache_size:1_000_000 ~min:[] ~max:hashes ~pred_node ~node
~commit t
in
let nodes = X.Repo.node_t t |> snd in
let check = X.Node.CA.integrity_check_inodes nodes in
let pred = Repo.default_pred_node in
Integrity_checks.check_inodes ~iter ~pred ~check t
let integrity_check_always ?ppf ~auto_repair t =
let contents = X.Repo.contents_t t in
let nodes = X.Repo.node_t t |> snd in
let commits = X.Repo.commit_t t |> snd in
let check ~kind ~offset ~length k =
match kind with
| `Contents -> X.Contents.CA.integrity_check ~offset ~length k contents
| `Node -> X.Node.CA.integrity_check ~offset ~length k nodes
| `Commit -> X.Commit.CA.integrity_check ~offset ~length k commits
in
let index = File_manager.index t.fm in
Integrity_checks.check_always ?ppf ~auto_repair ~check index
let integrity_check_minimal ?ppf ?heads t =
let* heads =
match heads with None -> Repo.heads t | Some m -> Lwt.return m
in
let hashes = List.map (fun x -> `Commit (Commit.key x)) heads in
let iter ~contents ~node ~pred_node ~pred_commit repo =
Repo.iter ~cache_size:1_000_000 ~min:[] ~max:hashes ~contents ~node
~pred_node ~pred_commit repo
in
let contents = X.Repo.contents_t t in
let pred = X.Node.CA.Val.pred in
let recompute_hash = X.Node.CA.Val.recompute_hash in
let check ~offset ~length k =
X.Contents.CA.integrity_check ~offset ~length k contents
in
Integrity_checks.check_minimal ?ppf ~pred ~iter ~check ~recompute_hash t
let integrity_check ?ppf ?heads ~auto_repair t =
let is_minimal =
t.X.Repo.config
|> Conf.indexing_strategy
|> Irmin_pack.Indexing_strategy.is_minimal
in
let result =
if is_minimal then integrity_check_minimal ?ppf ?heads t
else integrity_check_always ?ppf ~auto_repair t |> Lwt.return
in
result
module Stats_computation = struct
let pp_key = Irmin.Type.pp XKey.t
let traverse_inodes ~dump_blob_paths_to commit repo =
let module Stats = Checks.Stats (struct
type nonrec step = step
let step_t = step_t
module Hash = Hash
end) in
let t = Stats.v () in
let pred_node repo k =
X.Node.find (X.Repo.node_t repo) k >|= function
| None -> Fmt.failwith "key %a not found" pp_key k
| Some v ->
let width = X.Node.Val.length v in
let nb_children = X.Node.CA.Val.nb_children v in
let preds = X.Node.CA.Val.pred v in
let () =
preds
|> List.map (function
| s, `Contents h -> (s, `Contents (XKey.to_hash h))
| s, `Inode h -> (s, `Inode (XKey.to_hash h))
| s, `Node h -> (s, `Node (XKey.to_hash h)))
|> Stats.visit_node t (XKey.to_hash k) ~width ~nb_children
in
List.rev_map
(function
| s, `Inode x ->
assert (s = None);
`Node x
| _, `Node x -> `Node x
| _, `Contents x -> `Contents x)
preds
in
let pred_commit repo k =
X.Commit.find (X.Repo.commit_t repo) k >|= function
| None -> []
| Some c ->
let node = X.Commit.Val.node c in
Stats.visit_commit t (XKey.to_hash node);
[ `Node node ]
in
let pred_contents _repo k =
Stats.visit_contents t (XKey.to_hash k);
Lwt.return []
in
let* () =
Repo.breadth_first_traversal ~cache_size:0 ~pred_node ~pred_commit
~pred_contents ~max:[ commit ] repo
in
Stats.pp_results ~dump_blob_paths_to t;
Lwt.return_unit
let run ~dump_blob_paths_to ~commit repo =
Printexc.record_backtrace true;
let key = `Commit (Commit.key commit) in
traverse_inodes ~dump_blob_paths_to key repo
end
let stats = Stats_computation.run
let reload = X.Repo.reload
let flush = X.Repo.flush
let fsync = X.Repo.fsync
let is_split_allowed = X.Repo.is_split_allowed
let split = X.Repo.split_exn
let add_volume = X.Repo.add_volume_exn
let create_one_commit_store = X.Repo.Gc.create_one_commit_store
module Gc = struct
type msg = [ `Msg of string ]
type process_state =
[ `Idle | `Running | `Finalised of Stats.Latest_gc.stats ]
let catch_errors context error =
let err =
match error with
| Errors.Pack_error error ->
Fmt.str "Pack_error: %a" Errors.pp_base_error error
| Irmin.Closed -> "Irmin.Closed"
| Irmin_pack.RO_not_allowed -> "Irmin_pack.RO_not_allowed"
| Unix.Unix_error (err, s1, s2) ->
let pp = Irmin.Type.pp Io.misc_error_t in
Fmt.str "Unix_error: %a" pp (err, s1, s2)
| exn -> raise exn
in
let error_msg = Fmt.str "[%s] resulted in error: %s" context err in
Lwt.return_error (`Msg error_msg)
let map_errors context (error : Errs.t) =
let err_msg =
Fmt.str "[%s] resulted in error: %a" context (Irmin.Type.pp Errs.t)
error
in
`Msg err_msg
let finalise_exn = X.Repo.Gc.finalise_exn
let start_exn ?unlink t =
X.Repo.Gc.start_exn ?unlink ~use_auto_finalisation:false t
let start repo commit_key =
try
let* started =
X.Repo.Gc.start_exn ~unlink:true ~use_auto_finalisation:true repo
commit_key
in
Lwt.return_ok started
with exn -> catch_errors "Start GC" exn
let is_finished = X.Repo.Gc.is_finished
let behaviour = X.Repo.Gc.behaviour
let wait repo =
try
let* result = finalise_exn ~wait:true repo in
match result with
| `Running ->
assert false
| `Idle -> Lwt.return_ok None
| `Finalised stats -> Lwt.return_ok @@ Some stats
with exn -> catch_errors "Wait for GC" exn
let run ?(finished = fun _ -> Lwt.return_unit) repo commit_key =
let* started = start repo commit_key in
match started with
| Ok r ->
if r then
X.Repo.Gc.on_finalise repo (fun finalisation_r ->
match finalisation_r with
| Ok _ as stats -> finished stats
| Error err ->
let err_msg = map_errors "Finalise GC" err in
finished @@ Error err_msg);
Lwt.return_ok r
| Error _ as e -> Lwt.return e
let is_allowed = X.Repo.Gc.is_allowed
let cancel repo = X.Repo.Gc.cancel repo
let latest_gc_target = X.Repo.Gc.latest_gc_target
end
module Traverse_pack_file = Traverse_pack_file.Make (struct
module File_manager = File_manager
module Dispatcher = Dispatcher
module Hash = H
module Index = Index
module Inode = X.Node.CA
module Dict = Dict
module Contents = X.Contents.Pack_value
module Commit = X.Commit.Pack_value
end)
let traverse_pack_file = Traverse_pack_file.run
let test_traverse_pack_file = Traverse_pack_file.test
module Snapshot = struct
include X.Node.CA.Snapshot
type t = Inode of inode | Blob of Backend.Contents.Val.t
[@@deriving irmin]
module S = Snapshot.Make (struct
module Hash = H
module Inode = X.Node.CA
module Contents_pack = X.Contents.CA
module Fm = File_manager
module Dispatcher = Dispatcher
end)
include S
module Export = struct
let iter ?on_disk repo f ~root_key =
[%log.debug "Iterate over a tree"];
let contents = X.Repo.contents_t repo in
let nodes = X.Repo.node_t repo |> snd in
let export = S.Export.v repo.config contents nodes in
let f_contents x = f (Blob x) in
let f_nodes x = f (Inode x) in
match root_key with
| `Contents _ -> Fmt.failwith "[root_key] cannot be of type contents"
| `Node key ->
let* total =
Export.run ?on_disk export f_contents f_nodes
(key, Pack_value.Kind.Inode_v2_root)
in
Export.close export |> Errs.raise_if_error;
Lwt.return total
end
let export = Export.iter
module Import = struct
type process = Import.t
let v ?on_disk repo =
let contents = X.Repo.contents_t repo in
let nodes = X.Repo.node_t repo |> snd in
let log_size = Conf.index_log_size repo.config in
Import.v ?on_disk log_size contents nodes
let save_elt process elt =
match elt with
| Blob x -> Import.save_contents process x
| Inode x -> Import.save_inodes process x
let close process repo =
flush repo;
fsync repo;
Import.close process
end
end
module Internal = struct
module Io = Io
module Errs = Errs
module Index = Index
module File_manager = File_manager
let file_manager (repo : X.Repo.t) = repo.fm
module Dict = Dict
let dict (repo : X.Repo.t) = repo.dict
module Dispatcher = Dispatcher
let dispatcher (repo : X.Repo.t) = repo.dispatcher
module XKey = XKey
let suffix_commit_mem repo key =
X.Commit.CA.unsafe_find ~check_integrity:false
(snd (X.Repo.commit_t repo))
key
|> Option.is_some
let suffix_node_mem repo key =
X.Node.CA.unsafe_find ~check_integrity:false
(snd (X.Repo.node_t repo))
key
|> Option.is_some
let suffix_contents_mem repo key =
X.Contents.CA.unsafe_find ~check_integrity:false
(X.Repo.contents_t repo) key
|> Option.is_some
let kill_gc (repo : X.Repo.t) =
match (repo.running_gc : X.Repo.running_gc option) with
| None -> false
| Some { gc; _ } -> (
try X.Gc.cancel gc
with Unix.Unix_error (Unix.ESRCH, "kill", _) -> false)
end
end
end