machi/test/machi_merkle_tree_test.erl

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2015-10-24 03:59:23 +00:00
%% -------------------------------------------------------------------
%%
%% Copyright (c) 2007-2015 Basho Technologies, Inc. All Rights Reserved.
%%
%% This file is provided to you under the Apache License,
%% Version 2.0 (the "License"); you may not use this file
%% except in compliance with the License. You may obtain
%% a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing,
%% software distributed under the License is distributed on an
%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
%% KIND, either express or implied. See the License for the
%% specific language governing permissions and limitations
%% under the License.
%%
%% -------------------------------------------------------------------
-module(machi_merkle_tree_test).
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-compile([export_all]).
-include_lib("eunit/include/eunit.hrl").
-include_lib("kernel/include/file.hrl").
-define(TESTFILE, "yza^4c784dc2-19bf-4ac6-91f6-58bbe5aa88e0^1").
-define(GAP_CHANCE, 0.10).
choose_filename() ->
random_from_list([
"def^c5ea7511-d649-47d6-a8c3-2b619379c237^1",
"jkl^b077eff7-b2be-4773-a73f-fea4acb8a732^1",
"stu^553fa47a-157c-4fac-b10f-2252c7d8c37a^1",
"vwx^ae015d68-7689-4c9f-9677-926c6664f513^1",
"yza^4c784dc2-19bf-4ac6-91f6-58bbe5aa88e0^1"
]).
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make_csum_file(DataDir, Filename, Offsets) ->
Path = machi_util:make_checksum_filename(DataDir, Filename),
filelib:ensure_dir(Path),
{ok, MC} = machi_csum_table:open(Path, []),
lists:foreach(fun({Offset, Size, Checksum}) ->
machi_csum_table:write(MC, Offset, Size, Checksum) end,
Offsets),
machi_csum_table:close(MC).
choose_int(Factor) ->
random:uniform(1024*Factor).
small_int() ->
choose_int(10).
medium_int() ->
choose_int(1024).
large_int() ->
choose_int(4096).
make_offsets(Filename) ->
{ok, Info} = file:read_file_info(Filename),
Filesize = Info#file_info.size,
{ok, FH} = file:open(Filename, [read, raw, binary]),
Offsets = generate_offsets(FH, Filesize, 1024, []),
file:close(FH),
Offsets.
random_from_list(L) ->
N = random:uniform(length(L)),
lists:nth(N, L).
choose_size() ->
F = random_from_list([fun small_int/0, fun medium_int/0, fun large_int/0]),
F().
maybe_gap(Chance) when Chance < ?GAP_CHANCE ->
choose_size();
maybe_gap(_) -> 0.
generate_offsets(FH, Filesize, Current, Acc) when Current < Filesize ->
Length0 = choose_size(),
Length = case Length0 + Current > Filesize of
false -> Length0;
true -> Filesize - Current
end,
{ok, Data} = file:pread(FH, Current, Length),
Checksum = machi_util:make_tagged_csum(client_sha, machi_util:checksum_chunk(Data)),
Gap = maybe_gap(random:uniform()),
generate_offsets(FH, Filesize, Current + Length + Gap, [ {Current, Length, Checksum} | Acc ]);
generate_offsets(_FH, _Filesize, _Current, Acc) ->
lists:reverse(Acc).
test() ->
test(100).
test(N) ->
{ok, F} = file:open("results.txt", [raw, write]),
lists:foreach(fun(X) -> format_and_store(F, run_test(X)) end, lists:seq(1, N)).
format_and_store(F, {OffsetNum, {MTime, MSize}, {NTime, NSize}}) ->
S = io_lib:format("~w\t~w\t~w\t~w\t~w\n", [OffsetNum, MTime, MSize, NTime, NSize]),
ok = file:write(F, S).
run_test(C) ->
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random:seed(os:timestamp()),
OffsetFn = "test/" ++ choose_filename(),
O = make_offsets(OffsetFn),
Fn = "csum_" ++ integer_to_list(C),
make_csum_file(".", Fn, O),
Osize = length(O),
{MTime, {ok, M}} = timer:tc(fun() -> machi_merkle_tree:open(Fn, ".", merklet) end),
{NTime, {ok, N}} = timer:tc(fun() -> machi_merkle_tree:open(Fn, ".", naive) end),
?assertEqual(Fn, machi_merkle_tree:filename(M)),
?assertEqual(Fn, machi_merkle_tree:filename(N)),
MTree = machi_merkle_tree:tree(M),
MSize = byte_size(term_to_binary(MTree)),
NTree = machi_merkle_tree:tree(N),
NSize = byte_size(term_to_binary(NTree)),
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?assertEqual(same, machi_merkle_tree:diff(N, N)),
?assertEqual(same, machi_merkle_tree:diff(M, M)),
{Osize, {MTime, MSize}, {NTime, NSize}}.