[couchdb] branch prototype/fdb-layer-get-dbs-info updated (9719a75 -> 9f83233)

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 discard 9719a75  fixup: add size tests
     new 9f83233  fixup: add size tests

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Summary of changes:
 src/fabric/test/fabric2_doc_size_tests.erl | 55 ++++++++++++++----------------
 1 file changed, 26 insertions(+), 29 deletions(-)

[couchdb] 01/01: fixup: add size tests

[da...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

davisp pushed a commit to branch prototype/fdb-layer-get-dbs-info
in repository https://gitbox.apache.org/repos/asf/couchdb.git

commit 9f83233b76457a1b8793242dbd34c167583d70ca
Author: Paul J. Davis <pa...@gmail.com>
AuthorDate: Mon Feb 10 16:41:42 2020 -0600

    fixup: add size tests
---
 src/fabric/test/fabric2_doc_size_tests.erl | 135 +++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)

diff --git a/src/fabric/test/fabric2_doc_size_tests.erl b/src/fabric/test/fabric2_doc_size_tests.erl
new file mode 100644
index 0000000..9a3c832
--- /dev/null
+++ b/src/fabric/test/fabric2_doc_size_tests.erl
@@ -0,0 +1,135 @@
+% Licensed 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(fabric2_doc_size_tests).
+
+
+-include_lib("couch/include/couch_db.hrl").
+-include_lib("eunit/include/eunit.hrl").
+
+
+% Doc body size calculations
+% ID: size(Doc#doc.id)
+% Rev: size(erlfdb_tuple:encode(Start)) + size(Rev) % where Rev is usually 16
+% Deleted: 1 % (binary value is one byte)
+% Body: couch_ejson_size:external_size(Body) % Where empty is {} which is 2)
+
+
+-define(DOC_IDS, [
+    {0, <<>>},
+    {1, <<"a">>},
+    {3, <<"foo">>},
+    {6, <<"foobar">>},
+    {32, <<"af196ae095631b020eedf8f69303e336">>}
+]).
+
+-define(REV_STARTS, [
+    {1, 0},
+    {2, 1},
+    {2, 255},
+    {3, 256},
+    {3, 65535},
+    {4, 65536},
+    {4, 16777215},
+    {5, 16777216},
+    {5, 4294967295},
+    {6, 4294967296},
+    {6, 1099511627775},
+    {7, 1099511627776},
+    {7, 281474976710655},
+    {8, 281474976710656},
+    {8, 72057594037927935},
+    {9, 72057594037927936},
+    {9, 18446744073709551615},
+
+    % The jump from 9 to 11 bytes is because when we
+    % spill over into the bigint range of 9-255
+    % bytes we have an extra byte that encodes the
+    % length of the bigint.
+    {11, 18446744073709551616}
+]).
+
+-define(REVS, [
+    {0, <<>>},
+    {8, <<"foobarba">>},
+    {16, <<"foobarbazbambang">>}
+]).
+
+-define(DELETED, [
+    {1, true},
+    {1, false}
+]).
+
+-define(BODIES, [
+    {2, {[]}},
+    {13, {[{<<"foo">>, <<"bar">>}]}},
+    {28, {[{<<"b">>, <<"a">>}, {<<"c">>, [true, null, []]}]}}
+]).
+
+
+empty_doc_test() ->
+    ?assertEqual(4, fabric2_util:rev_size(#doc{})).
+
+
+docid_size_test() ->
+    lists:foreach(fun({Size, DocId}) ->
+        ?assertEqual(4 + Size, fabric2_util:rev_size(#doc{id = DocId}))
+    end, ?DOC_IDS).
+
+
+rev_size_test() ->
+    lists:foreach(fun({StartSize, Start}) ->
+        lists:foreach(fun({RevSize, Rev}) ->
+            Doc = #doc{
+                revs = {Start, [Rev]}
+            },
+            ?assertEqual(3 + StartSize + RevSize, fabric2_util:rev_size(Doc))
+        end, ?REVS)
+    end, ?REV_STARTS).
+
+
+deleted_size_test() ->
+    lists:foreach(fun({Size, Deleted}) ->
+        ?assertEqual(3 + Size, fabric2_util:rev_size(#doc{deleted = Deleted}))
+    end, ?DELETED).
+
+
+body_size_test() ->
+    lists:foreach(fun({Size, Body}) ->
+        ?assertEqual(2 + Size, fabric2_util:rev_size(#doc{body = Body}))
+    end, ?BODIES).
+
+
+combinatorics_test() ->
+    Elements = [
+        {?DOC_IDS, fun(Doc, DocId) -> Doc#doc{id = DocId} end},
+        {?REV_STARTS, fun(Doc, RevStart) ->
+            #doc{revs = {_, RevIds}} = Doc,
+            Doc#doc{revs = {RevStart, RevIds}}
+        end},
+        {?REVS, fun(Doc, Rev) ->
+           #doc{revs = {Start, _}} = Doc,
+           Doc#doc{revs = {Start, [Rev]}}
+        end},
+        {?DELETED, fun(Doc, Deleted) -> Doc#doc{deleted = Deleted} end},
+        {?BODIES, fun(Doc, Body) -> Doc#doc{body = Body} end}
+    ],
+    combine(Elements, 0, #doc{}).
+
+
+combine([], TotalSize, Doc) ->
+    ?assertEqual(TotalSize, fabric2_util:rev_size(Doc));
+
+combine([{Elems, UpdateFun} | Rest], TotalSize, Doc) ->
+    lists:foreach(fun({Size, Elem}) ->
+        combine(Rest, TotalSize + Size, UpdateFun(Doc, Elem))
+    end, Elems).