machi/src/machi_flu1.erl

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%% -------------------------------------------------------------------
%%
%% 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.
%%
%% -------------------------------------------------------------------
%% @doc The Machi FLU file server + file location sequencer.
%%
%% This module implements only the Machi FLU file server and its
%% implicit sequencer.
%% Please see the EDoc "Overview" for details about the FLU as a
%% primitive file server process vs. the larger Machi design of a FLU
%% as a sequencer + file server + chain manager group of processes.
%%
%% For the moment, this module also implements a rudimentary TCP-based
%% protocol as the sole supported access method to the server,
%% sequencer, and projection store. Conceptually, those three
%% services are independent and ought to have their own protocols. As
%% a practical matter, there is no need for wire protocol
%% compatibility. Furthermore, from the perspective of failure
%% detection, it is very convenient that all three FLU-related
%% services are accessed using the same single TCP port.
%%
%% The FLU is named after the CORFU server "FLU" or "FLash Unit" server.
%%
%% TODO There is a major missing feature in this FLU implementation:
%% there is no "write-once" enforcement for any position in a Machi
%% file. At the moment, we rely on correct behavior of the client
%% & the sequencer to avoid overwriting data. In the Real World,
%% however, all Machi file data is supposed to be exactly write-once
%% to avoid problems with bugs, wire protocol corruption, malicious
%% clients, etc.
%%
%% TODO The per-file metadata tuple store is missing from this implementation.
%%
%% TODO Section 4.1 ("The FLU") of the Machi design doc suggests that
%% the FLU keep track of the epoch number of the last file write (and
%% perhaps last metadata write), as an optimization for inter-FLU data
%% replication/chain repair.
%%
%% TODO Section 4.2 ("The Sequencer") says that the sequencer must
%% change its file assignments to new & unique names whenever we move
%% to wedge state. This is not yet implemented. In the current
%% Erlang process scheme (which will probably be changing soon), a
%% simple implementation would stop all existing processes that are
%% running run_seq_append_server().
-module(machi_flu1).
-include_lib("kernel/include/file.hrl").
-include("machi.hrl").
-include("machi_projection.hrl").
-define(SERVER_CMD_READ_TIMEOUT, 600*1000).
-export([start_link/1, stop/1,
update_wedge_state/3]).
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-export([make_listener_regname/1, make_projection_server_regname/1]).
-record(state, {
flu_name :: atom(),
proj_store :: pid(),
append_pid :: pid(),
tcp_port :: non_neg_integer(),
data_dir :: string(),
wedged = true :: boolean(),
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etstab :: ets:tid(),
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epoch_id :: 'undefined' | pv1_epoch(),
dbg_props = [] :: list(), % proplist
props = [] :: list() % proplist
}).
start_link([{FluName, TcpPort, DataDir}|Rest])
when is_atom(FluName), is_integer(TcpPort), is_list(DataDir) ->
{ok, spawn_link(fun() -> main2(FluName, TcpPort, DataDir, Rest) end)}.
stop(Pid) ->
case erlang:is_process_alive(Pid) of
true ->
Pid ! killme,
ok;
false ->
error
end.
update_wedge_state(PidSpec, Boolean, EpochId)
when (Boolean == true orelse Boolean == false), is_tuple(EpochId) ->
PidSpec ! {wedge_state_change, Boolean, EpochId}.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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ets_table_name(FluName) when is_atom(FluName) ->
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list_to_atom(atom_to_list(FluName) ++ "_epoch").
%% ets_table_name(FluName) when is_binary(FluName) ->
%% list_to_atom(binary_to_list(FluName) ++ "_epoch").
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main2(FluName, TcpPort, DataDir, Rest) ->
{Props, DbgProps} = case proplists:get_value(dbg, Rest) of
undefined ->
{Rest, []};
DPs ->
{lists:keydelete(dbg, 1, Rest), DPs}
end,
{SendAppendPidToProj_p, ProjectionPid} =
case proplists:get_value(projection_store_registered_name, Rest) of
undefined ->
RN = make_projection_server_regname(FluName),
{ok, PP} =
machi_projection_store:start_link(RN, DataDir, undefined),
{true, PP};
RN ->
{false, whereis(RN)}
end,
InitialWedged_p = proplists:get_value(initial_wedged, DbgProps),
ProjRes = machi_projection_store:read_latest_projection(ProjectionPid,
private),
{Wedged_p, EpochId} =
if InitialWedged_p == undefined,
is_tuple(ProjRes), element(1, ProjRes) == ok ->
{ok, Proj} = ProjRes,
{false, {Proj#projection_v1.epoch_number,
Proj#projection_v1.epoch_csum}};
InitialWedged_p == false ->
{false, ?DUMMY_PV1_EPOCH};
true ->
{true, undefined}
end,
S0 = #state{flu_name=FluName,
proj_store=ProjectionPid,
tcp_port=TcpPort,
data_dir=DataDir,
wedged=Wedged_p,
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etstab=ets_table_name(FluName),
epoch_id=EpochId,
dbg_props=DbgProps,
props=Props},
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AppendPid = start_append_server(S0, self()),
receive
append_server_ack -> ok
end,
if SendAppendPidToProj_p ->
machi_projection_store:set_wedge_notify_pid(ProjectionPid,
AppendPid);
true ->
ok
end,
S1 = S0#state{append_pid=AppendPid},
ListenPid = start_listen_server(S1),
Config_e = machi_util:make_config_filename(DataDir, "unused"),
ok = filelib:ensure_dir(Config_e),
{_, Data_e} = machi_util:make_data_filename(DataDir, "unused"),
ok = filelib:ensure_dir(Data_e),
Projection_e = machi_util:make_projection_filename(DataDir, "unused"),
ok = filelib:ensure_dir(Projection_e),
put(flu_flu_name, FluName),
put(flu_append_pid, AppendPid),
put(flu_projection_pid, ProjectionPid),
put(flu_listen_pid, ListenPid),
receive killme -> ok end,
(catch exit(AppendPid, kill)),
(catch exit(ProjectionPid, kill)),
(catch exit(ListenPid, kill)),
ok.
start_listen_server(S) ->
proc_lib:spawn_link(fun() -> run_listen_server(S) end).
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start_append_server(S, AckPid) ->
FluPid = self(),
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proc_lib:spawn_link(fun() -> run_append_server(FluPid, AckPid, S) end).
%% start_projection_server(S) ->
%% spawn_link(fun() -> run_projection_server(S) end).
run_listen_server(#state{flu_name=FluName, tcp_port=TcpPort}=S) ->
register(make_listener_regname(FluName), self()),
SockOpts = [{reuseaddr, true},
{mode, binary}, {active, false}, {packet, line}],
{ok, LSock} = gen_tcp:listen(TcpPort, SockOpts),
listen_server_loop(LSock, S).
run_append_server(FluPid, AckPid, #state{flu_name=Name,
wedged=Wedged_p,epoch_id=EpochId}=S) ->
%% Reminder: Name is the "main" name of the FLU, i.e., no suffix
register(Name, self()),
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TID = ets:new(ets_table_name(Name),
[set, protected, named_table, {read_concurrency, true}]),
%% InitialWedged = proplists:get_value(initial_wedged, DbgProps, true),
%% ets:insert(TID, {epoch, {InitialWedged, {-65, <<"bogus epoch, yo">>}}}),
ets:insert(TID, {epoch, {Wedged_p, EpochId}}),
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AckPid ! append_server_ack,
append_server_loop(FluPid, S#state{etstab=TID}).
listen_server_loop(LSock, S) ->
{ok, Sock} = gen_tcp:accept(LSock),
spawn_link(fun() -> net_server_loop(Sock, S) end),
listen_server_loop(LSock, S).
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append_server_loop(FluPid, #state{data_dir=DataDir,wedged=Wedged_p}=S) ->
AppendServerPid = self(),
receive
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{seq_append, From, _Prefix, _Chunk, _CSum, _Extra} when Wedged_p ->
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From ! wedged,
append_server_loop(FluPid, S);
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{seq_append, From, Prefix, Chunk, CSum, Extra} ->
spawn(fun() -> append_server_dispatch(From, Prefix,
Chunk, CSum, Extra,
DataDir, AppendServerPid) end),
append_server_loop(FluPid, S);
{wedge_state_change, Boolean, EpochId} ->
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true = ets:insert(S#state.etstab, {epoch, {Boolean, EpochId}}),
append_server_loop(FluPid, S#state{wedged=Boolean,
epoch_id=EpochId});
{wedge_status, FromPid} ->
#state{wedged=Wedged_p, epoch_id=EpochId} = S,
FromPid ! {wedge_status_reply, Wedged_p, EpochId},
append_server_loop(FluPid, S);
Else ->
io:format(user, "append_server_loop: WHA? ~p\n", [Else]),
append_server_loop(FluPid, S)
end.
-define(EpochIDSpace, ((4*2)+(20*2))). % hexencodingwhee!
decode_epoch_id(EpochIDHex) ->
<<EpochNum:(4*8)/big, EpochCSum/binary>> =
machi_util:hexstr_to_bin(EpochIDHex),
{EpochNum, EpochCSum}.
net_server_loop(Sock, #state{flu_name=FluName, data_dir=DataDir}=S) ->
ok = inet:setopts(Sock, [{packet, line}]),
%% TODO: Add testing control knob to adjust this timeout and/or inject
%% timeout condition.
case gen_tcp:recv(Sock, 0, ?SERVER_CMD_READ_TIMEOUT) of
{ok, Line} ->
%% machi_util:verb("Got: ~p\n", [Line]),
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PrefixLenLF = byte_size(Line) - 2 - ?EpochIDSpace - 8 -8 - 1,
FileLenLF = byte_size(Line) - 2 - ?EpochIDSpace - 16 - 8 - 1,
CSumFileLenLF = byte_size(Line) - 2 - ?EpochIDSpace - 1,
WriteFileLenLF = byte_size(Line) - 7 - ?EpochIDSpace - 16 - 8 - 1,
DelFileLenLF = byte_size(Line) - 14 - ?EpochIDSpace - 1,
case Line of
%% For normal use
<<"A ",
EpochIDHex:(?EpochIDSpace)/binary,
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LenHex:8/binary, ExtraHex:8/binary,
Prefix:PrefixLenLF/binary, "\n">> ->
_EpochID = decode_epoch_id(EpochIDHex),
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do_net_server_append(FluName, Sock, LenHex, ExtraHex,
Prefix);
<<"R ",
EpochIDHex:(?EpochIDSpace)/binary,
OffsetHex:16/binary, LenHex:8/binary,
File:FileLenLF/binary, "\n">> ->
EpochID = decode_epoch_id(EpochIDHex),
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do_net_server_read(Sock, OffsetHex, LenHex, File, DataDir,
EpochID, S);
<<"L ", EpochIDHex:(?EpochIDSpace)/binary, "\n">> ->
_EpochID = decode_epoch_id(EpochIDHex),
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do_net_server_listing(Sock, DataDir, S);
<<"C ",
EpochIDHex:(?EpochIDSpace)/binary,
File:CSumFileLenLF/binary, "\n">> ->
_EpochID = decode_epoch_id(EpochIDHex),
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do_net_server_checksum_listing(Sock, File, DataDir, S);
<<"QUIT\n">> ->
catch gen_tcp:close(Sock),
exit(normal);
<<"QUIT\r\n">> ->
catch gen_tcp:close(Sock),
exit(normal);
%% For "internal" replication only.
<<"W-repl ",
EpochIDHex:(?EpochIDSpace)/binary,
OffsetHex:16/binary, LenHex:8/binary,
File:WriteFileLenLF/binary, "\n">> ->
_EpochID = decode_epoch_id(EpochIDHex),
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do_net_server_write(Sock, OffsetHex, LenHex, File, DataDir,
<<"fixme1">>, false, <<"fixme2">>);
%% For data migration only.
<<"DEL-migration ",
EpochIDHex:(?EpochIDSpace)/binary,
File:DelFileLenLF/binary, "\n">> ->
_EpochID = decode_epoch_id(EpochIDHex),
do_net_server_delete_migration_only(Sock, File, DataDir);
%% For erasure coding hackityhack
<<"TRUNC-hack--- ",
EpochIDHex:(?EpochIDSpace)/binary,
File:DelFileLenLF/binary, "\n">> ->
_EpochID = decode_epoch_id(EpochIDHex),
do_net_server_truncate_hackityhack(Sock, File, DataDir);
<<"PROJ ", LenHex:8/binary, "\n">> ->
do_projection_command(Sock, LenHex, S);
<<"WEDGE-STATUS\n">> ->
do_wedge_status(FluName, Sock);
_ ->
machi_util:verb("Else Got: ~p\n", [Line]),
io:format(user, "TODO: Else Got: ~p\n", [Line]),
gen_tcp:send(Sock, "ERROR SYNTAX\n"),
catch gen_tcp:close(Sock),
exit(normal)
end,
net_server_loop(Sock, S);
_ ->
catch gen_tcp:close(Sock),
exit(normal)
end.
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append_server_dispatch(From, Prefix, Chunk, CSum, Extra, DataDir, LinkPid) ->
Pid = write_server_get_pid(Prefix, DataDir, LinkPid),
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Pid ! {seq_append, From, Prefix, Chunk, CSum, Extra},
exit(normal).
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do_net_server_append(FluName, Sock, LenHex, ExtraHex, Prefix) ->
%% TODO: robustify against other invalid path characters such as NUL
case sanitize_file_string(Prefix) of
ok ->
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do_net_server_append2(FluName, Sock, LenHex, ExtraHex, Prefix);
_ ->
ok = gen_tcp:send(Sock, <<"ERROR BAD-ARG">>)
end.
sanitize_file_string(Str) ->
case re:run(Str, "/") of
nomatch ->
ok;
_ ->
error
end.
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do_net_server_append2(FluName, Sock, LenHex, ExtraHex, Prefix) ->
<<Len:32/big>> = machi_util:hexstr_to_bin(LenHex),
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<<Extra:32/big>> = machi_util:hexstr_to_bin(ExtraHex),
ok = inet:setopts(Sock, [{packet, raw}]),
{ok, Chunk} = gen_tcp:recv(Sock, Len, 60*1000),
CSum = machi_util:checksum_chunk(Chunk),
try
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FluName ! {seq_append, self(), Prefix, Chunk, CSum, Extra}
catch error:badarg ->
error_logger:error_msg("Message send to ~p gave badarg, make certain server is running with correct registered name\n", [?MODULE])
end,
receive
{assignment, Offset, File} ->
OffsetHex = machi_util:bin_to_hexstr(<<Offset:64/big>>),
Out = io_lib:format("OK ~s ~s\n", [OffsetHex, File]),
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ok = gen_tcp:send(Sock, Out);
wedged ->
ok = gen_tcp:send(Sock, <<"ERROR WEDGED\n">>)
after 10*1000 ->
ok = gen_tcp:send(Sock, "TIMEOUT\n")
end.
do_wedge_status(FluName, Sock) ->
FluName ! {wedge_status, self()},
Reply = receive
{wedge_status_reply, Bool, EpochId} ->
BoolHex = if Bool == false -> <<"00">>;
Bool == true -> <<"01">>
end,
case EpochId of
undefined ->
EpochHex = machi_util:int_to_hexstr(0, 32),
CSumHex = machi_util:bin_to_hexstr(<<0:(20*8)/big>>);
{Epoch, EpochCSum} ->
EpochHex = machi_util:int_to_hexstr(Epoch, 32),
CSumHex = machi_util:bin_to_hexstr(EpochCSum)
end,
[<<"OK ">>, BoolHex, 32, EpochHex, 32, CSumHex, 10]
after 30*1000 ->
<<"give_it_up\n">>
end,
ok = gen_tcp:send(Sock, Reply).
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do_net_server_read(Sock, OffsetHex, LenHex, FileBin, DataDir,
EpochID, S) ->
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{Wedged_p, CurrentEpochId} = ets:lookup_element(S#state.etstab, epoch, 2),
DoItFun = fun(FH, Offset, Len) ->
case file:pread(FH, Offset, Len) of
{ok, Bytes} when byte_size(Bytes) == Len ->
gen_tcp:send(Sock, ["OK\n", Bytes]);
{ok, Bytes} ->
machi_util:verb("ok read but wanted ~p got ~p: ~p @ offset ~p\n",
[Len, size(Bytes), FileBin, Offset]),
ok = gen_tcp:send(Sock, "ERROR PARTIAL-READ\n");
eof ->
perhaps_do_net_server_ec_read(Sock, FH);
_Else2 ->
machi_util:verb("Else2 ~p ~p ~P\n",
[Offset, Len, _Else2, 20]),
ok = gen_tcp:send(Sock, "ERROR BAD-READ\n")
end
end,
do_net_server_readwrite_common(Sock, OffsetHex, LenHex, FileBin, DataDir,
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[read, binary, raw], DoItFun,
EpochID, Wedged_p, CurrentEpochId).
do_net_server_readwrite_common(Sock, OffsetHex, LenHex, FileBin, DataDir,
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FileOpts, DoItFun,
EpochID, Wedged_p, CurrentEpochId) ->
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case {Wedged_p, sanitize_file_string(FileBin)} of
{false, ok} ->
do_net_server_readwrite_common2(Sock, OffsetHex, LenHex, FileBin,
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DataDir, FileOpts, DoItFun,
EpochID, Wedged_p, CurrentEpochId);
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{true, _} ->
ok = gen_tcp:send(Sock, <<"ERROR WEDGED\n">>);
{_, __} ->
ok = gen_tcp:send(Sock, <<"ERROR BAD-ARG\n">>)
end.
do_net_server_readwrite_common2(Sock, OffsetHex, LenHex, FileBin, DataDir,
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FileOpts, DoItFun,
EpochID, Wedged_p, CurrentEpochId) ->
<<Offset:64/big>> = machi_util:hexstr_to_bin(OffsetHex),
<<Len:32/big>> = machi_util:hexstr_to_bin(LenHex),
{_, Path} = machi_util:make_data_filename(DataDir, FileBin),
OptsHasWrite = lists:member(write, FileOpts),
case file:open(Path, FileOpts) of
{ok, FH} ->
try
DoItFun(FH, Offset, Len)
after
file:close(FH)
end;
{error, enoent} when OptsHasWrite ->
do_net_server_readwrite_common(
Sock, OffsetHex, LenHex, FileBin, DataDir,
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FileOpts, DoItFun,
EpochID, Wedged_p, CurrentEpochId);
_Else ->
%%%%%% keep?? machi_util:verb("Else ~p ~p ~p ~p\n", [Offset, Len, Path, _Else]),
ok = gen_tcp:send(Sock, <<"ERROR BAD-IO\n">>)
end.
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do_net_server_write(Sock, OffsetHex, LenHex, FileBin, DataDir,
EpochID, Wedged_p, CurrentEpochId) ->
CSumPath = machi_util:make_checksum_filename(DataDir, FileBin),
case file:open(CSumPath, [append, raw, binary, delayed_write]) of
{ok, FHc} ->
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do_net_server_write2(Sock, OffsetHex, LenHex, FileBin, DataDir, FHc,
EpochID, Wedged_p, CurrentEpochId);
{error, enoent} ->
ok = filelib:ensure_dir(CSumPath),
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do_net_server_write(Sock, OffsetHex, LenHex, FileBin, DataDir,
EpochID, Wedged_p, CurrentEpochId)
end.
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do_net_server_write2(Sock, OffsetHex, LenHex, FileBin, DataDir, FHc,
EpochID, Wedged_p, CurrentEpochId) ->
DoItFun = fun(FHd, Offset, Len) ->
ok = inet:setopts(Sock, [{packet, raw}]),
{ok, Chunk} = gen_tcp:recv(Sock, Len),
CSum = machi_util:checksum_chunk(Chunk),
case file:pwrite(FHd, Offset, Chunk) of
ok ->
CSumHex = machi_util:bin_to_hexstr(CSum),
CSum_info = [OffsetHex, 32, LenHex, 32, CSumHex, 10],
ok = file:write(FHc, CSum_info),
ok = file:close(FHc),
gen_tcp:send(Sock, <<"OK\n">>);
_Else3 ->
machi_util:verb("Else3 ~p ~p ~p\n",
[Offset, Len, _Else3]),
ok = gen_tcp:send(Sock, "ERROR BAD-PWRITE\n")
end
end,
do_net_server_readwrite_common(Sock, OffsetHex, LenHex, FileBin, DataDir,
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[write, read, binary, raw], DoItFun,
EpochID, Wedged_p, CurrentEpochId).
perhaps_do_net_server_ec_read(Sock, FH) ->
case file:pread(FH, 0, ?MINIMUM_OFFSET) of
{ok, Bin} when byte_size(Bin) == ?MINIMUM_OFFSET ->
decode_and_reply_net_server_ec_read(Sock, Bin);
{ok, _AnythingElse} ->
ok = gen_tcp:send(Sock, "ERROR PARTIAL-READ2\n");
_AnythingElse ->
ok = gen_tcp:send(Sock, "ERROR BAD-PREAD\n")
end.
decode_and_reply_net_server_ec_read(Sock, <<"a ", Rest/binary>>) ->
decode_and_reply_net_server_ec_read_version_a(Sock, Rest);
decode_and_reply_net_server_ec_read(Sock, <<0:8, _/binary>>) ->
ok = gen_tcp:send(Sock, <<"ERROR NOT-ERASURE\n">>).
decode_and_reply_net_server_ec_read_version_a(Sock, Rest) ->
%% <<BodyLenHex:4/binary, " ", StripeWidthHex:16/binary, " ",
%% OrigFileLenHex:16/binary, " ", _/binary>> = Rest,
HdrLen = 80 - 2 - 4 - 1,
<<BodyLenHex:4/binary, " ", Hdr:HdrLen/binary, Rest2/binary>> = Rest,
<<BodyLen:16/big>> = machi_util:hexstr_to_bin(BodyLenHex),
<<Body:BodyLen/binary, _/binary>> = Rest2,
ok = gen_tcp:send(Sock, ["ERASURE ", BodyLenHex, " ", Hdr, Body]).
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do_net_server_listing(Sock, DataDir, S) ->
{Wedged_p, _CurrentEpochId} = ets:lookup_element(S#state.etstab, epoch, 2),
if Wedged_p ->
ok = gen_tcp:send(Sock, <<"ERROR WEDGED\n">>);
true ->
do_net_server_listing2(Sock, DataDir)
end.
do_net_server_listing2(Sock, DataDir) ->
{_, WildPath} = machi_util:make_data_filename(DataDir, ""),
Files = filelib:wildcard("*", WildPath),
Out = ["OK\n",
[begin
{ok, FI} = file:read_file_info(WildPath ++ "/" ++ File),
Size = FI#file_info.size,
SizeBin = <<Size:64/big>>,
[machi_util:bin_to_hexstr(SizeBin), <<" ">>,
list_to_binary(File), <<"\n">>]
end || File <- Files],
".\n"
],
ok = gen_tcp:send(Sock, Out).
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do_net_server_checksum_listing(Sock, File, DataDir, S) ->
{Wedged_p, _CurrentEpochId} = ets:lookup_element(S#state.etstab, epoch, 2),
case {Wedged_p, sanitize_file_string(File)} of
{true, _} ->
ok = gen_tcp:send(Sock, <<"ERROR WEDGED\n">>);
{false, ok} ->
do_net_server_checksum_listing2(Sock, File, DataDir);
_ ->
ok = gen_tcp:send(Sock, <<"ERROR BAD-ARG\n">>)
end.
do_net_server_checksum_listing2(Sock, File, DataDir) ->
ok = sync_checksum_file(File),
CSumPath = machi_util:make_checksum_filename(DataDir, File),
case file:open(CSumPath, [read, raw, binary]) of
{ok, FH} ->
{ok, FI} = file:read_file_info(CSumPath),
Len = FI#file_info.size,
LenHex = list_to_binary(machi_util:bin_to_hexstr(<<Len:64/big>>)),
%% Client has option of line-by-line with "." terminator,
%% or using the offset in the OK message to slurp things
%% down by exact byte size.
ok = gen_tcp:send(Sock, [<<"OK ">>, LenHex, <<"\n">>]),
do_net_copy_bytes(FH, Sock),
ok = file:close(FH),
ok = gen_tcp:send(Sock, ".\n");
{error, enoent} ->
ok = gen_tcp:send(Sock, "ERROR NO-SUCH-FILE\n");
_ ->
ok = gen_tcp:send(Sock, "ERROR\n")
end.
sync_checksum_file(File) ->
Prefix = re:replace(File, "\\..*", "", [{return, binary}]),
case write_server_find_pid(Prefix) of
undefined ->
ok;
Pid ->
Ref = make_ref(),
Pid ! {sync_stuff, self(), Ref},
receive
{sync_finished, Ref} ->
ok
after 5000 ->
case write_server_find_pid(Prefix) of
undefined ->
ok;
Pid2 when Pid2 /= Pid ->
ok;
_Pid2 ->
error
end
end
end.
do_net_copy_bytes(FH, Sock) ->
case file:read(FH, 1024*1024) of
{ok, Bin} ->
ok = gen_tcp:send(Sock, Bin),
do_net_copy_bytes(FH, Sock);
eof ->
ok
end.
do_net_server_delete_migration_only(Sock, File, DataDir) ->
case sanitize_file_string(File) of
ok ->
do_net_server_delete_migration_only2(Sock, File, DataDir);
_ ->
ok = gen_tcp:send(Sock, <<"ERROR BAD-ARG\n">>)
end.
do_net_server_delete_migration_only2(Sock, File, DataDir) ->
{_, Path} = machi_util:make_data_filename(DataDir, File),
case file:delete(Path) of
ok ->
ok = gen_tcp:send(Sock, "OK\n");
{error, enoent} ->
ok = gen_tcp:send(Sock, "ERROR NO-SUCH-FILE\n");
_ ->
ok = gen_tcp:send(Sock, "ERROR\n")
end.
do_net_server_truncate_hackityhack(Sock, File, DataDir) ->
case sanitize_file_string(File) of
ok ->
do_net_server_truncate_hackityhack2(Sock, File, DataDir);
_ ->
ok = gen_tcp:send(Sock, <<"ERROR BAD-ARG\n">>)
end.
do_net_server_truncate_hackityhack2(Sock, File, DataDir) ->
{_, Path} = machi_util:make_data_filename(DataDir, File),
case file:open(Path, [read, write, binary, raw]) of
{ok, FH} ->
try
{ok, ?MINIMUM_OFFSET} = file:position(FH, ?MINIMUM_OFFSET),
ok = file:truncate(FH),
ok = gen_tcp:send(Sock, "OK\n")
after
file:close(FH)
end;
{error, enoent} ->
ok = gen_tcp:send(Sock, "ERROR NO-SUCH-FILE\n");
_ ->
ok = gen_tcp:send(Sock, "ERROR\n")
end.
write_server_get_pid(Prefix, DataDir, LinkPid) ->
case write_server_find_pid(Prefix) of
undefined ->
start_seq_append_server(Prefix, DataDir, LinkPid),
timer:sleep(1),
write_server_get_pid(Prefix, DataDir, LinkPid);
Pid ->
Pid
end.
write_server_find_pid(Prefix) ->
FluName = machi_util:make_regname(Prefix),
whereis(FluName).
start_seq_append_server(Prefix, DataDir, AppendServerPid) ->
proc_lib:spawn_link(fun() ->
%% The following is only necessary to
%% make nice process relationships in
%% 'appmon' and related tools.
put('$ancestors', [AppendServerPid]),
put('$initial_call', {x,y,3}),
link(AppendServerPid),
run_seq_append_server(Prefix, DataDir)
end).
run_seq_append_server(Prefix, DataDir) ->
true = register(machi_util:make_regname(Prefix), self()),
run_seq_append_server2(Prefix, DataDir).
run_seq_append_server2(Prefix, DataDir) ->
FileNum = machi_util:read_max_filenum(DataDir, Prefix) + 1,
case machi_util:increment_max_filenum(DataDir, Prefix) of
ok ->
machi_util:increment_max_filenum(DataDir, Prefix),
machi_util:info_msg("start: ~p server at file ~w\n",
[Prefix, FileNum]),
seq_append_server_loop(DataDir, Prefix, FileNum);
Else ->
error_logger:error_msg("start: ~p server at file ~w: ~p\n",
[Prefix, FileNum, Else]),
exit(Else)
end.
-spec seq_name_hack() -> string().
seq_name_hack() ->
lists:flatten(io_lib:format("~.36B~.36B",
[element(3,now()),
list_to_integer(os:getpid())])).
seq_append_server_loop(DataDir, Prefix, FileNum) ->
SequencerNameHack = seq_name_hack(),
{File, FullPath} = machi_util:make_data_filename(
DataDir, Prefix, SequencerNameHack, FileNum),
{ok, FHd} = file:open(FullPath,
[write, binary, raw]),
%% [write, binary, raw, delayed_write]),
CSumPath = machi_util:make_checksum_filename(
DataDir, Prefix, SequencerNameHack, FileNum),
{ok, FHc} = file:open(CSumPath, [append, raw, binary, delayed_write]),
seq_append_server_loop(DataDir, Prefix, File, {FHd,FHc}, FileNum,
?MINIMUM_OFFSET).
seq_append_server_loop(DataDir, Prefix, _File, {FHd,FHc}, FileNum, Offset)
when Offset > ?MAX_FILE_SIZE ->
ok = file:close(FHd),
ok = file:close(FHc),
machi_util:info_msg("rollover: ~p server at file ~w offset ~w\n",
[Prefix, FileNum, Offset]),
run_seq_append_server2(Prefix, DataDir);
seq_append_server_loop(DataDir, Prefix, File, {FHd,FHc}=FH_, FileNum, Offset) ->
receive
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{seq_append, From, Prefix, Chunk, CSum, Extra} ->
if Chunk /= <<>> ->
ok = file:pwrite(FHd, Offset, Chunk);
true ->
ok
end,
From ! {assignment, Offset, File},
Len = byte_size(Chunk),
OffsetHex = machi_util:bin_to_hexstr(<<Offset:64/big>>),
LenHex = machi_util:bin_to_hexstr(<<Len:32/big>>),
CSumHex = machi_util:bin_to_hexstr(CSum),
CSum_info = [OffsetHex, 32, LenHex, 32, CSumHex, 10],
ok = file:write(FHc, CSum_info),
seq_append_server_loop(DataDir, Prefix, File, FH_,
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FileNum, Offset + Len + Extra);
{sync_stuff, FromPid, Ref} ->
file:sync(FHc),
FromPid ! {sync_finished, Ref},
seq_append_server_loop(DataDir, Prefix, File, FH_,
FileNum, Offset)
after 30*1000 ->
ok = file:close(FHd),
ok = file:close(FHc),
machi_util:info_msg("stop: ~p server ~p at file ~w offset ~w\n",
[Prefix, self(), FileNum, Offset]),
exit(normal)
end.
do_projection_command(Sock, LenHex, S) ->
try
Len = machi_util:hexstr_to_int(LenHex),
ok = inet:setopts(Sock, [{packet, raw}]),
{ok, ProjCmdBin} = gen_tcp:recv(Sock, Len),
ok = inet:setopts(Sock, [{packet, line}]),
ProjCmd = binary_to_term(ProjCmdBin),
put(hack, ProjCmd),
Res = handle_projection_command(ProjCmd, S),
ResBin = term_to_binary(Res),
ResLenHex = machi_util:int_to_hexbin(byte_size(ResBin), 32),
ok = gen_tcp:send(Sock, [<<"OK ">>, ResLenHex, <<"\n">>, ResBin])
catch
What:Why ->
io:format(user, "OOPS ~p\n", [get(hack)]),
io:format(user, "OOPS ~p ~p ~p\n", [What, Why, erlang:get_stacktrace()]),
WHA = list_to_binary(io_lib:format("TODO-YOLO.~w:~w-~w",
[What, Why, erlang:get_stacktrace()])),
_ = (catch gen_tcp:send(Sock, [<<"ERROR ">>, WHA, <<"\n">>]))
end.
handle_projection_command({get_latest_epochid, ProjType},
#state{proj_store=ProjStore}) ->
machi_projection_store:get_latest_epochid(ProjStore, ProjType);
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handle_projection_command({read_latest_projection, ProjType},
#state{proj_store=ProjStore}) ->
machi_projection_store:read_latest_projection(ProjStore, ProjType);
handle_projection_command({read_projection, ProjType, Epoch},
#state{proj_store=ProjStore}) ->
machi_projection_store:read(ProjStore, ProjType, Epoch);
handle_projection_command({write_projection, ProjType, Proj},
#state{proj_store=ProjStore}) ->
machi_projection_store:write(ProjStore, ProjType, Proj);
handle_projection_command({get_all_projections, ProjType},
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#state{proj_store=ProjStore}) ->
machi_projection_store:get_all_projections(ProjStore, ProjType);
handle_projection_command({list_all_projections, ProjType},
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#state{proj_store=ProjStore}) ->
machi_projection_store:list_all_projections(ProjStore, ProjType);
handle_projection_command(Else, _S) ->
{error, unknown_cmd, Else}.
make_listener_regname(BaseName) ->
list_to_atom(atom_to_list(BaseName) ++ "_listener").
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%% This is the name of the projection store that is spawned by the
%% *flu*, for use primarily in testing scenarios. In normal use, we
%% ought to be using the OTP style of managing processes, via
%% supervisors, namely via machi_flu_psup.erl, which uses a
%% *different* naming convention for the projection store name that it
%% registers.
make_projection_server_regname(BaseName) ->
list_to_atom(atom_to_list(BaseName) ++ "_pstore2").