2015-04-03 08:10:52 +00:00
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%% -------------------------------------------------------------------
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%%
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%% Copyright (c) 2007-2015 Basho Technologies, Inc. All Rights Reserved.
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%%
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%% This file is provided to you under the Apache License,
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%% Version 2.0 (the "License"); you may not use this file
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%% except in compliance with the License. You may obtain
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%% a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing,
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%% software distributed under the License is distributed on an
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%% "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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%% KIND, either express or implied. See the License for the
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%% specific language governing permissions and limitations
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%% under the License.
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%%
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%% -------------------------------------------------------------------
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-module(machi_projection_store).
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-include("machi_projection.hrl").
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%% API
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-export([
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start_link/3,
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get_latest_epoch/2, get_latest_epoch/3,
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2015-04-03 09:37:09 +00:00
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read_latest_projection/2, read_latest_projection/3,
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2015-04-03 08:55:35 +00:00
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read/3, read/4,
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write/3, write/4,
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get_all/2, get_all/3,
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list_all/2, list_all/3
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2015-04-03 08:10:52 +00:00
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]).
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%% gen_server callbacks
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-export([init/1, handle_call/3, handle_cast/2, handle_info/2,
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terminate/2, code_change/3]).
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-record(state, {
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public_dir = "" :: string(),
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private_dir = "" :: string(),
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wedged = true :: boolean(),
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wedge_notify_pid :: pid() | atom(),
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max_public_epoch = -1 :: -1 | non_neg_integer(),
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max_private_epoch = -1 :: -1 | non_neg_integer()
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}).
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start_link(RegName, DataDir, NotifyWedgeStateChanges) ->
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gen_server:start_link({local, RegName},
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?MODULE, [DataDir, NotifyWedgeStateChanges], []).
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2015-04-03 08:55:35 +00:00
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get_latest_epoch(PidSpec, ProjType) ->
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get_latest_epoch(PidSpec, ProjType, infinity).
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get_latest_epoch(PidSpec, ProjType, Timeout)
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when ProjType == 'public' orelse ProjType == 'private' ->
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g_call(PidSpec, {get_latest_epoch, ProjType}, Timeout).
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read_latest_projection(PidSpec, ProjType) ->
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read_latest_projection(PidSpec, ProjType, infinity).
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read_latest_projection(PidSpec, ProjType, Timeout)
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when ProjType == 'public' orelse ProjType == 'private' ->
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g_call(PidSpec, {read_latest_projection, ProjType}, Timeout).
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read(PidSpec, ProjType, Epoch) ->
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read(PidSpec, ProjType, Epoch, infinity).
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read(PidSpec, ProjType, Epoch, Timeout)
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when ProjType == 'public' orelse ProjType == 'private',
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is_integer(Epoch), Epoch >= 0 ->
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g_call(PidSpec, {read, ProjType, Epoch}, Timeout).
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write(PidSpec, ProjType, Proj) ->
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write(PidSpec, ProjType, Proj, infinity).
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write(PidSpec, ProjType, Proj, Timeout)
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when ProjType == 'public' orelse ProjType == 'private',
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is_record(Proj, projection_v1),
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is_integer(Proj#projection_v1.epoch_number),
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Proj#projection_v1.epoch_number >= 0 ->
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g_call(PidSpec, {write, ProjType, Proj}, Timeout).
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get_all(PidSpec, ProjType) ->
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get_all(PidSpec, ProjType, infinity).
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get_all(PidSpec, ProjType, Timeout)
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when ProjType == 'public' orelse ProjType == 'private' ->
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g_call(PidSpec, {get_all, ProjType}, Timeout).
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list_all(PidSpec, ProjType) ->
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list_all(PidSpec, ProjType, infinity).
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list_all(PidSpec, ProjType, Timeout)
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when ProjType == 'public' orelse ProjType == 'private' ->
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g_call(PidSpec, {list_all, ProjType}, Timeout).
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%%%%%%%%%%%%%%%%%%%%%%%%%%%
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g_call(PidSpec, Arg, Timeout) ->
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LC1 = lclock_get(),
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{Res, LC2} = gen_server:call(PidSpec, {Arg, LC1}, Timeout),
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lclock_update(LC2),
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Res.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%
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init([DataDir, NotifyWedgeStateChanges]) ->
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lclock_init(),
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PublicDir = machi_util:make_projection_filename(DataDir, "public"),
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PrivateDir = machi_util:make_projection_filename(DataDir, "private"),
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ok = filelib:ensure_dir(PublicDir ++ "/ignored"),
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ok = filelib:ensure_dir(PrivateDir ++ "/ignored"),
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MaxPublicEpoch = find_max_epoch(PublicDir),
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MaxPrivateEpoch = find_max_epoch(PrivateDir),
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{ok, #state{public_dir=PublicDir,
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private_dir=PrivateDir,
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wedged=true,
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wedge_notify_pid=NotifyWedgeStateChanges,
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max_public_epoch=MaxPublicEpoch,
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max_private_epoch=MaxPrivateEpoch}}.
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handle_call({{get_latest_epoch, ProjType}, LC1}, _From, S) ->
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LC2 = lclock_update(LC1),
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Epoch = if ProjType == public -> S#state.max_public_epoch;
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ProjType == private -> S#state.max_private_epoch
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end,
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{reply, {{ok, Epoch}, LC2}, S};
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handle_call({{read_latest_projection, ProjType}, LC1}, _From, S) ->
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LC2 = lclock_update(LC1),
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Epoch = if ProjType == public -> S#state.max_public_epoch;
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ProjType == private -> S#state.max_private_epoch
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end,
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{Reply, NewS} = do_proj_read(ProjType, Epoch, S),
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{reply, {Reply, LC2}, NewS};
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handle_call({{read, ProjType, Epoch}, LC1}, _From, S) ->
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LC2 = lclock_update(LC1),
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{Reply, NewS} = do_proj_read(ProjType, Epoch, S),
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{reply, {Reply, LC2}, NewS};
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handle_call({{write, ProjType, Proj}, LC1}, _From, S) ->
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LC2 = lclock_update(LC1),
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{Reply, NewS} = do_proj_write(ProjType, Proj, S),
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{reply, {Reply, LC2}, NewS};
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handle_call({{get_all, ProjType}, LC1}, _From, S) ->
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LC2 = lclock_update(LC1),
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Dir = pick_path(ProjType, S),
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Epochs = find_all(Dir),
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All = [begin
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{{ok, Proj}, _} = do_proj_read(ProjType, Epoch, S),
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Proj
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end || Epoch <- Epochs],
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{reply, {{ok, All}, LC2}, S};
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handle_call({{list_all, ProjType}, LC1}, _From, S) ->
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LC2 = lclock_update(LC1),
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Dir = pick_path(ProjType, S),
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{reply, {{ok, find_all(Dir)}, LC2}, S};
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handle_call(_Request, _From, S) ->
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Reply = whaaaaaaaaaaaaa,
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{reply, Reply, S}.
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handle_cast(_Msg, S) ->
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{noreply, S}.
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handle_info(_Info, S) ->
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{noreply, S}.
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terminate(_Reason, _S) ->
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ok.
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code_change(_OldVsn, S, _Extra) ->
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{ok, S}.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%
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do_proj_read(_ProjType, Epoch, S) when Epoch < 0 ->
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{{error, not_written}, S};
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do_proj_read(ProjType, Epoch, S) ->
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Dir = pick_path(ProjType, S),
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Path = filename:join(Dir, epoch2name(Epoch)),
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case file:read_file(Path) of
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{ok, Bin} ->
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%% TODO and if Bin is corrupt? (even if binary_to_term() succeeds)
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{{ok, binary_to_term(Bin)}, S};
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{error, enoent} ->
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{{error, not_written}, S};
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{error, Else} ->
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{{error, Else}, S}
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end.
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do_proj_write(ProjType, #projection_v1{epoch_number=Epoch}=Proj, S) ->
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%% TODO: We probably ought to check the projection checksum for sanity, eh?
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Dir = pick_path(ProjType, S),
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Path = filename:join(Dir, epoch2name(Epoch)),
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case file:read_file_info(Path) of
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{ok, _FI} ->
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{{error, written}, S};
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{error, enoent} ->
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{ok, FH} = file:open(Path, [write, raw, binary]),
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ok = file:write(FH, term_to_binary(Proj)),
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ok = file:sync(FH),
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ok = file:close(FH),
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NewS = if ProjType == public, Epoch > S#state.max_public_epoch ->
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io:format(user, "TODO: tell ~p we are wedged by epoch ~p\n", [S#state.wedge_notify_pid, Epoch]),
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S#state{max_public_epoch=Epoch, wedged=true};
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ProjType == private, Epoch > S#state.max_private_epoch ->
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io:format(user, "TODO: tell ~p we are unwedged by epoch ~p\n", [S#state.wedge_notify_pid, Epoch]),
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S#state{max_private_epoch=Epoch, wedged=false};
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true ->
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S
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end,
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{ok, NewS};
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{error, Else} ->
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{{error, Else}, S}
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end.
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pick_path(public, S) ->
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S#state.public_dir;
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pick_path(private, S) ->
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S#state.private_dir.
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epoch2name(Epoch) ->
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machi_util:int_to_hexstr(Epoch, 32).
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name2epoch(Name) ->
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machi_util:hexstr_to_int(Name).
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2015-04-03 09:37:09 +00:00
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find_all(Dir) ->
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Fs = filelib:wildcard("*", Dir),
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lists:sort([name2epoch(F) || F <- Fs]).
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2015-04-03 08:10:52 +00:00
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find_max_epoch(Dir) ->
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Fs = lists:sort(filelib:wildcard("*", Dir)),
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if Fs == [] ->
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-1;
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true ->
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name2epoch(lists:last(Fs))
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end.
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%%%%%%%%%%%%%%%%%%%%%%%%%%%
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-ifdef(TEST).
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lclock_init() ->
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lamport_clock:init().
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lclock_get() ->
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lamport_clock:get().
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lclock_update(LC) ->
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lamport_clock:update(LC).
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-else. % TEST
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lclock_init() ->
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ok.
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lclock_get() ->
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ok.
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lclock_update(_LC) ->
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ok.
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-endif. % TEST
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