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lets/test/qc/qc_leveldb.erl
Joseph Wayne Norton e3c129b105 Add support to use async thread pool for driver backend 
Enhance driver implementation to optionally use Erlang's asynchronous
driver thread pool for all LevelDB operations with the intention to
avoid blocking of Erlang's scheduler threads.
2011-11-06 23:42:47 +09:00

321 lines
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Erlang
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%%% The MIT License
%%%
%%% Copyright (C) 2011 by Joseph Wayne Norton <norton@alum.mit.edu>
%%%
%%% Permission is hereby granted, free of charge, to any person obtaining a copy
%%% of this software and associated documentation files (the "Software"), to deal
%%% in the Software without restriction, including without limitation the rights
%%% to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
%%% copies of the Software, and to permit persons to whom the Software is
%%% furnished to do so, subject to the following conditions:
%%%
%%% The above copyright notice and this permission notice shall be included in
%%% all copies or substantial portions of the Software.
%%%
%%% THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
%%% IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
%%% FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
%%% AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
%%% LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
%%% OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
%%% THE SOFTWARE.
-module(qc_leveldb).
%% API
-export([%% test
setup/0
, teardown/0
, is_db/1
%% lets
, open/0, open/1
, reopen/0, reopen/1
, destroy/0, destroy/1
, repair/0, repair/1
, close/1
, put/2, put/3
, delete/2, delete/3
, get/2, get/3
, first/1, first/2
, last/1, last/2
, next/2, next/3
]).
%%%===================================================================
%%% API
%%%===================================================================
setup() ->
Options = [{c_src,"../c_src/leveldb/include/leveldb/c.h"},
{additional_files, ["../c_src/leveldb/lib/libleveldb.a", "../c_src/snappy/lib/libsnappy.a"]},
{cflags, "-lstdc++ -lpthread"}],
DebugOptions = [%% verbose
%% valgrind , {exec_command_line, fun(Exe) -> {os:find_executable("valgrind"), [Exe]} end}
],
eqc_c:start(leveldb, Options ++ DebugOptions).
%% eqc_c:start(leveldb, Options).
teardown() ->
os:cmd("rm -rf " ++ ?MODULE_STRING).
is_db({ptr, {struct, leveldb_t}, _}) ->
true;
is_db(_) ->
false.
open() ->
Options = leveldb:leveldb_options_create(),
try
leveldb:leveldb_options_set_create_if_missing(Options, 1),
leveldb:leveldb_options_set_error_if_exists(Options, 1),
open(Options)
after
leveldb:leveldb_options_destroy(Options)
end.
open(Options) ->
ErrPtr = errptr(),
try
case leveldb:leveldb_open(Options, ?MODULE_STRING, ErrPtr) of
{ptr, {struct, leveldb_t}, 0} ->
read_errptr(ErrPtr);
{ptr, {struct, leveldb_t}, _}=Db ->
Db
end
after
free_ptr(ErrPtr)
end.
reopen() ->
Options = leveldb:leveldb_options_create(),
try
reopen(Options)
after
leveldb:leveldb_options_destroy(Options)
end.
reopen(Options) ->
ErrPtr = errptr(),
try
case leveldb:leveldb_open(Options, ?MODULE_STRING, ErrPtr) of
{ptr, {struct, leveldb_t}, 0} ->
read_errptr(ErrPtr);
{ptr, {struct, leveldb_t}, _}=Db ->
Db
end
after
free_ptr(ErrPtr)
end.
destroy() ->
Options = leveldb:leveldb_options_create(),
try
destroy(Options)
after
leveldb:leveldb_options_destroy(Options)
end.
destroy(Options) ->
ErrPtr = errptr(),
try
leveldb:leveldb_destroy(Options, ?MODULE_STRING, ErrPtr),
read_errptr(ErrPtr)
after
free_ptr(ErrPtr)
end.
repair() ->
Options = leveldb:leveldb_options_create(),
try
repair(Options)
after
leveldb:leveldb_options_repair(Options)
end.
repair(Options) ->
ErrPtr = errptr(),
try
leveldb:leveldb_repair(Options, ?MODULE_STRING, ErrPtr),
read_errptr(ErrPtr)
after
free_ptr(ErrPtr)
end.
close(Db) ->
ok == leveldb:leveldb_close(Db).
put(Db, Obj) ->
Options = leveldb:leveldb_writeoptions_create(),
try
put(Db, Options, Obj)
after
leveldb:leveldb_writeoptions_destroy(Options)
end.
put(Db, Options, {obj,Key,Val}) ->
ErrPtr = errptr(),
try
leveldb:leveldb_put(Db, Options, binary_to_list(Key), byte_size(Key), binary_to_list(Val), byte_size(Val), ErrPtr),
read_errptr(ErrPtr)
after
free_ptr(ErrPtr)
end.
delete(Db, Key) ->
Options = leveldb:leveldb_writeoptions_create(),
try
delete(Db, Options, Key)
after
leveldb:leveldb_writeoptions_destroy(Options)
end.
delete(Db, Options, Key) ->
ErrPtr = errptr(),
try
leveldb:leveldb_delete(Db, Options, binary_to_list(Key), byte_size(Key), ErrPtr),
read_errptr(ErrPtr)
after
free_ptr(ErrPtr)
end.
get(Db, Key) ->
Options = leveldb:leveldb_readoptions_create(),
try
get(Db, Options, Key)
after
leveldb:leveldb_readoptions_destroy(Options)
end.
get(Db, Options, Key) ->
ErrPtr = errptr(),
LenPtr = lenptr(),
try
case leveldb:leveldb_get(Db, Options, binary_to_list(Key), byte_size(Key), LenPtr, ErrPtr) of
0 ->
read_errptr(ErrPtr);
ValPtr ->
read_binary(ValPtr, LenPtr)
end
after
free_ptr(ErrPtr),
free_ptr(LenPtr)
end.
first(Db) ->
Options = leveldb:leveldb_readoptions_create(),
try
first(Db, Options)
after
leveldb:leveldb_readoptions_destroy(Options)
end.
first(Db, Options) ->
Iter = leveldb:leveldb_create_iterator(Db, Options),
LenPtr = lenptr(),
try
leveldb:leveldb_iter_seek_to_first(Iter),
case leveldb:leveldb_iter_valid(Iter) of
0 ->
true;
1 ->
KeyPtr = leveldb:leveldb_iter_key(Iter, LenPtr),
read_binary(KeyPtr, LenPtr)
end
after
leveldb:leveldb_iter_destroy(Iter),
free_ptr(LenPtr)
end.
last(Db) ->
Options = leveldb:leveldb_readoptions_create(),
try
last(Db, Options)
after
leveldb:leveldb_readoptions_destroy(Options)
end.
last(Db, Options) ->
Iter = leveldb:leveldb_create_iterator(Db, Options),
LenPtr = lenptr(),
try
leveldb:leveldb_iter_seek_to_last(Iter),
case leveldb:leveldb_iter_valid(Iter) of
0 ->
true;
1 ->
KeyPtr = leveldb:leveldb_iter_key(Iter, LenPtr),
read_binary(KeyPtr, LenPtr)
end
after
leveldb:leveldb_iter_destroy(Iter),
free_ptr(LenPtr)
end.
next(Db, Key) ->
Options = leveldb:leveldb_readoptions_create(),
try
next(Db, Key, Options)
after
leveldb:leveldb_readoptions_destroy(Options)
end.
next(Db, Key, Options) ->
Iter = leveldb:leveldb_create_iterator(Db, Options),
LenPtr = lenptr(),
LenPtr1 = lenptr(),
try
leveldb:leveldb_iter_seek(Iter, binary_to_list(Key), byte_size(Key)),
case leveldb:leveldb_iter_valid(Iter) of
0 ->
true;
1 ->
KeyPtr = leveldb:leveldb_iter_key(Iter, LenPtr),
K = read_binary(KeyPtr, LenPtr),
if K =/= Key ->
K;
true ->
leveldb:leveldb_iter_next(Iter),
case leveldb:leveldb_iter_valid(Iter) of
0 ->
true;
1 ->
KeyPtr1 = leveldb:leveldb_iter_key(Iter, LenPtr1),
read_binary(KeyPtr1, LenPtr1)
end
end
end
after
leveldb:leveldb_iter_destroy(Iter),
free_ptr(LenPtr),
free_ptr(LenPtr1)
end.
%%%===================================================================
%%% Internal
%%%===================================================================
errptr() ->
eqc_c:alloc({ptr, char}, [0]).
lenptr() ->
eqc_c:alloc(unsigned_long, 0).
free_ptr(Ptr) ->
eqc_c:free(Ptr).
read_errptr(ErrPtr) ->
case eqc_c:read_string(eqc_c:deref(ErrPtr)) of
[] ->
true;
Err ->
Err
end.
read_lenptr(LenPtr) ->
eqc_c:deref(LenPtr).
read_binary({ptr, char, 0}, _LenPtr) ->
true;
read_binary(ValPtr, LenPtr) ->
list_to_binary(eqc_c:read_array(ValPtr, read_lenptr(LenPtr))).
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