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only download stuff that is not present

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This commit is contained in:
Hannes Mehnert 2022-08-26 15:34:20 +02:00
parent a61f944d4f
commit cd3294ebe3
1 changed files with 45 additions and 13 deletions
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40
mirage/unikernel.ml
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@ -356,22 +356,45 @@ module Make
else
Lwt.return_unit
let read t h v =
let find_key t h v =
match hex_of_string v with
| Error `Msg msg ->
Logs.err (fun m -> m "error %s while decoding hex %s" msg v);
Lwt.return (Error `Bad_request)
Error `Bad_request
| Ok bin ->
match
match h with
| `MD5 -> SM.find_opt bin t.md5s
| `SHA512 -> SM.find_opt bin t.sha512s
| `SHA256 -> Some bin
| _ -> None
with
| None ->
Logs.err (fun m -> m "couldn't find %s" v);
Lwt.return (Error `Not_found)
| Some x ->
Error `Not_found
| Some x -> Ok x
let exists t h v =
match find_key t h v with
| Error _ -> Lwt.return false
| Ok x ->
KV.exists t.dev (Mirage_kv.Key.v x) >|= function
| Ok Some `Value -> true
| Ok Some `Dictionary ->
Logs.err (fun m -> m "unexpected dictionary for %s %s"
(hash_to_string h) (hex_to_string v));
false
| Ok None -> false
| Error e ->
Logs.err (fun m -> m "exists %s %s returned %a"
(hash_to_string h) (hex_to_string v)
KV.pp_error e);
false
let read t h v =
match find_key t h v with
| Error _ as e -> Lwt.return e
| Ok x ->
KV.get t.dev (Mirage_kv.Key.v x) >|= function
| Ok data -> Ok data
| Error e ->
@ -443,6 +466,15 @@ module Make
end
in
Lwt_list.iter_p (fun (url, csums) ->
HM.fold (fun h v r ->
r >>= function
| true -> Disk.exists disk h v
| false -> Lwt.return false)
csums (Lwt.return true) >>= function
| true ->
Logs.info (fun m -> m "ignoring %s (already present)" url);
Lwt.return_unit
| false ->
follow 20 url >>= function
| Some str -> Disk.write disk str csums
| None -> Lwt.return_unit)