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%%% Copyright (c) 2017, NORDUnet A/S.
%%% See LICENSE for licensing information.
-module(merge_util).
-export([sendlog/5, sendentries/4, missingentries/2]).
-export([request/3, request/5]).
-export([readfile/1, nfetched/0]).
request(DebugTag, URL, NodeName) ->
request(DebugTag, URL, NodeName, [], <<>>).
request(DebugTag, URL, NodeName, Headers, RequestBody) ->
case plop_httputil:request(DebugTag, URL, Headers, RequestBody) of
{error, Err} ->
statusreport:report_multi("merge_errors", NodeName, "http_error", list_to_binary(io_lib:format("~w", [Err]))),
throw({request_error, request, DebugTag, Err});
{failure, {none, StatusCode, none}, _RespHeaders, _Body} ->
statusreport:report_multi("merge_errors", NodeName, "http_error", StatusCode),
throw({request_error, failure, DebugTag, StatusCode});
{success, {_, StatusCode, _}, _, Body} when StatusCode == 200 ->
case (catch mochijson2:decode(Body)) of
{error, Err} ->
statusreport:report_multi("merge_errors", NodeName, "http_error", list_to_binary(Err)),
throw({request_error, decode, DebugTag, Err});
{struct, PropList} ->
statusreport:report_multi("merge_errors", NodeName, "http_error", 200),
{proplists:get_value(<<"result">>, PropList), PropList}
end
end.
sendlog(NodeAddress, NodeName, Start, Hashes, Chunksize) ->
lager:debug("sending log: start=~B, N=~B, chunksize=~B", [Start, length(Hashes), Chunksize]),
sendlog_chunk(NodeAddress, NodeName, Start, lists:split(min(Chunksize, length(Hashes)), Hashes), Chunksize).
sendlog_chunk(_, _, _, {[], _}, _) ->
ok;
sendlog_chunk(NodeAddress, NodeName, Start, {Chunk, Rest}, Chunksize) ->
lager:debug("sending log chunk: start=~B, N=~B", [Start, length(Chunk)]),
ok = sendlog_request(NodeAddress, NodeName, Start, Chunk),
sendlog_chunk(NodeAddress, NodeName, Start + length(Chunk),
lists:split(min(Chunksize, length(Rest)), Rest), Chunksize).
sendlog_request(NodeAddress, NodeName, Start, Hashes) ->
DebugTag = io_lib:format("sendlog ~B:~B", [Start, length(Hashes)]),
URL = NodeAddress ++ "sendlog",
Headers = [{"Content-Type", "text/json"}],
EncodedHashes = [base64:encode(H) || H <- Hashes],
RequestBody = list_to_binary(mochijson2:encode({[{"start", Start},
{"hashes", EncodedHashes}]})),
case request(DebugTag, URL, NodeName, Headers, RequestBody) of
{<<"ok">>, _} ->
ok;
Err ->
throw({request_error, result, DebugTag, Err})
end.
missingentries(NodeAddress, NodeName) ->
DebugTag = "missingentries",
URL = NodeAddress ++ "missingentries",
case request(DebugTag, URL, NodeName) of
{<<"ok">>, PropList} ->
{ok, proplists:get_value(<<"entries">>, PropList)};
Err ->
throw({request_error, result, DebugTag, Err})
end.
sendentries(NodeAddress, NodeName, Hashes, Chunksize) ->
lager:debug("sending entries: N=~B, chunksize=~B", [length(Hashes), Chunksize]),
{ChunkOfHashes, RestOfHashes} = lists:split(min(Chunksize, length(Hashes)), Hashes),
sendentries_chunk(NodeAddress, NodeName, {ChunkOfHashes, RestOfHashes}, Chunksize).
sendentries_chunk(_, _, {[], _}, _) ->
ok;
sendentries_chunk(NodeAddress, NodeName, {Chunk, Rest}, Chunksize) ->
lager:debug("sending entries chunk: N=~B", [length(Chunk)]),
HashesAndEntries = lists:zip(Chunk, lists:map(fun db:entry_for_leafhash/1, Chunk)),
case lists:keysearch(noentry, 2, HashesAndEntries) of
false ->
ok = sendentries_request(NodeAddress, NodeName, HashesAndEntries),
sendentries_chunk(NodeAddress, NodeName,
lists:split(min(Chunksize, length(Rest)), Rest),
Chunksize);
Missing ->
lager:error("Entries not in db: ~p", [Missing]),
{error, entrynotindb}
end.
sendentries_request(NodeAddress, NodeName, HashesAndEntries) ->
DebugTag = io_lib:format("sendentry ~B", [length(HashesAndEntries)]),
URL = NodeAddress ++ "sendentry",
Headers = [{"Content-Type", "text/json"}],
L = mochijson2:encode([[{"entry", base64:encode(E)}, {"treeleafhash", base64:encode(H)}] || {H, E} <- HashesAndEntries]),
RequestBody = list_to_binary(L),
case request(DebugTag, URL, NodeName, Headers, RequestBody) of
{<<"ok">>, _} ->
ok;
Err ->
throw({request_error, result, DebugTag, Err})
end.
readfile(FileInConfig) ->
case application:get_env(plop, FileInConfig) of
{ok, File} ->
case atomic:readfile(File) of
noentry ->
noentry;
Contents ->
mochijson2:decode(Contents)
end;
undefined ->
noentry
end.
nfetched() ->
{Index, Hash} = read_fetched(),
case Index >= 0 of
true ->
ok = verify_logorder_entry(Index, binary_to_list(Hash));
false ->
ok
end,
Index + 1.
read_fetched() ->
case merge_util:readfile(fetched_path) of
noentry ->
{-1, <<>>};
{struct, PropList} ->
{proplists:get_value(<<"index">>, PropList),
proplists:get_value(<<"hash">>, PropList)}
end.
verify_logorder_entry(Index, HashAsString) ->
case hex:bin_to_hexstr(index:get(logorder, Index)) of
HashAsString ->
ok;
Mismatch ->
lager:error("hash in fetched file ~p doesn't match logorder[~B]=~p",
[HashAsString, Index, Mismatch]),
mismatch
end.
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