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-%% @author Bob Ippolito <bob@mochimedia.com>
-%% @copyright 2010 Mochi Media, Inc.
-
-%% @doc Write newline delimited log files, ensuring that if a truncated
-%% entry is found on log open then it is fixed before writing. Uses
-%% delayed writes and raw files for performance.
--module(mochilogfile2).
--author('bob@mochimedia.com').
-
--export([open/1, write/2, close/1, name/1]).
-
-%% @spec open(Name) -> Handle
-%% @doc Open the log file Name, creating or appending as necessary. All data
-%% at the end of the file will be truncated until a newline is found, to
-%% ensure that all records are complete.
-open(Name) ->
- {ok, FD} = file:open(Name, [raw, read, write, delayed_write, binary]),
- fix_log(FD),
- {?MODULE, Name, FD}.
-
-%% @spec name(Handle) -> string()
-%% @doc Return the path of the log file.
-name({?MODULE, Name, _FD}) ->
- Name.
-
-%% @spec write(Handle, IoData) -> ok
-%% @doc Write IoData to the log file referenced by Handle.
-write({?MODULE, _Name, FD}, IoData) ->
- ok = file:write(FD, [IoData, $\n]),
- ok.
-
-%% @spec close(Handle) -> ok
-%% @doc Close the log file referenced by Handle.
-close({?MODULE, _Name, FD}) ->
- ok = file:sync(FD),
- ok = file:close(FD),
- ok.
-
-fix_log(FD) ->
- {ok, Location} = file:position(FD, eof),
- Seek = find_last_newline(FD, Location),
- {ok, Seek} = file:position(FD, Seek),
- ok = file:truncate(FD),
- ok.
-
-%% Seek backwards to the last valid log entry
-find_last_newline(_FD, N) when N =< 1 ->
- 0;
-find_last_newline(FD, Location) ->
- case file:pread(FD, Location - 1, 1) of
- {ok, <<$\n>>} ->
- Location;
- {ok, _} ->
- find_last_newline(FD, Location - 1)
- end.
-
-%%
-%% Tests
-%%
--include_lib("eunit/include/eunit.hrl").
--ifdef(TEST).
-name_test() ->
- D = mochitemp:mkdtemp(),
- FileName = filename:join(D, "open_close_test.log"),
- H = open(FileName),
- ?assertEqual(
- FileName,
- name(H)),
- close(H),
- file:delete(FileName),
- file:del_dir(D),
- ok.
-
-open_close_test() ->
- D = mochitemp:mkdtemp(),
- FileName = filename:join(D, "open_close_test.log"),
- OpenClose = fun () ->
- H = open(FileName),
- ?assertEqual(
- true,
- filelib:is_file(FileName)),
- ok = close(H),
- ?assertEqual(
- {ok, <<>>},
- file:read_file(FileName)),
- ok
- end,
- OpenClose(),
- OpenClose(),
- file:delete(FileName),
- file:del_dir(D),
- ok.
-
-write_test() ->
- D = mochitemp:mkdtemp(),
- FileName = filename:join(D, "write_test.log"),
- F = fun () ->
- H = open(FileName),
- write(H, "test line"),
- close(H),
- ok
- end,
- F(),
- ?assertEqual(
- {ok, <<"test line\n">>},
- file:read_file(FileName)),
- F(),
- ?assertEqual(
- {ok, <<"test line\ntest line\n">>},
- file:read_file(FileName)),
- file:delete(FileName),
- file:del_dir(D),
- ok.
-
-fix_log_test() ->
- D = mochitemp:mkdtemp(),
- FileName = filename:join(D, "write_test.log"),
- file:write_file(FileName, <<"first line good\nsecond line bad">>),
- F = fun () ->
- H = open(FileName),
- write(H, "test line"),
- close(H),
- ok
- end,
- F(),
- ?assertEqual(
- {ok, <<"first line good\ntest line\n">>},
- file:read_file(FileName)),
- file:write_file(FileName, <<"first line bad">>),
- F(),
- ?assertEqual(
- {ok, <<"test line\n">>},
- file:read_file(FileName)),
- F(),
- ?assertEqual(
- {ok, <<"test line\ntest line\n">>},
- file:read_file(FileName)),
- ok.
-
--endif.