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Configure FLUs and chains with "rc.d" style configuration #56

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slfritchie merged 43 commits from slf/flu-config-rcd-style into master 2015-12-18 06:46:05 +00:00
Conversation 6 Commits 43 Files changed 32 +64 -13
1 changed files with 64 additions and 13 deletions
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src/machi_lifecycle_mgr.erl
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@ -499,7 +499,7 @@ process_pending_chains(P_Chains, S) ->
lists:foldl(fun process_pending_chain/2, S, P_Chains).
process_pending_chain({File, CD}, S) ->
#chain_def_v1{full=Full, witnesses=Witnesses} = CD,
#chain_def_v1{name=Name, full=Full, witnesses=Witnesses} = CD,
case sanitize_chain_def_records([CD]) of
[CD] ->
RunningFLUs = get_local_running_flus(),
@ -507,11 +507,34 @@ process_pending_chain({File, CD}, S) ->
case ordsets:intersection(ordsets:from_list(AllNames),
ordsets:from_list(RunningFLUs)) of
[] ->
lager:error("Pending chain config file ~s "
"has no local FLUs on this machine, rejected\n",
[File]),
_ = move_to_rejected(File, S),
S;
%% TODO: hahahah, /me cries ... so, there's a problem if
%% we crash at the end of process_pending_chain2(), then
%% we don't delete the pending #chain_def_v1{} file ... so
%% we'll come to this same path the next time, and
%% get_current_chain_for_running_flus() may tell us that
%% there are zero FLUs running for this chain ... because
%% they were stopped before the crash. Silly.
%%
%% TODO: fix this gap by adding another field to
%% #chain_def_v1{} that specifies what *policy*
%% believes/states/defines/THE_TRUTH about which
%% FLUs in the chain are configured on this machine.
%% Then always use exactly that truth to guide us.
case get_current_chain_for_running_flus(CD, RunningFLUs) of
[] ->
lager:error("Pending chain config file ~s has no "
"FLUs on this machine, rejected\n",
[File]),
_ = move_to_rejected(File, S),
S;
RemovedFLUs ->
lager:info("Pending chain config file ~s creates "
"chain ~w of length 0, "
"stopping FLUS: ~w\n",
[File, Name, RemovedFLUs]),
process_pending_chain2(File, CD, RemovedFLUs,
delete, S)
end;
[FLU|_] ->
%% TODO: Between the successful chain change inside of
%% bootstrap_chain() (and before it returns to us!) and
@ -519,7 +542,8 @@ process_pending_chain({File, CD}, S) ->
%% window if this process crashes.
case bootstrap_chain(CD, FLU) of
{ok, _AddedFLUs, RemovedFLUs} ->
process_pending_chain2(File, CD, RemovedFLUs, S);
process_pending_chain2(File, CD, RemovedFLUs,
move, S);
Else ->
lager:error("Pending chain config file ~s "
"has failed (~w), rejected\n",
@ -535,7 +559,7 @@ process_pending_chain({File, CD}, S) ->
S
end.
process_pending_chain2(File, CD, RemovedFLUs, S) ->
process_pending_chain2(File, CD, RemovedFLUs, ChainConfigAction, S) ->
LocalRemovedFLUs = [FLU || FLU <- RemovedFLUs,
flu_config_exists(FLU, S)],
case LocalRemovedFLUs of
@ -556,15 +580,25 @@ process_pending_chain2(File, CD, RemovedFLUs, S) ->
MyPreserveDir = PreserveDir ++ "/" ++ FLU_str ++ "." ++ Suffix,
ok = filelib:ensure_dir(MyPreserveDir ++ "/unused"),
_ = file:make_dir(MyPreserveDir),
_ = file:rename(ConfigDir ++ "/" ++ FLU_str,
MyPreserveDir ++ "/" ++ FLU_str ++ ".config"),
_ = file:rename(FluDataDir ++ "/" ++ FLU_str,
MyPreserveDir ++ "/" ++ FLU_str ++ ".data"),
Src1 = ConfigDir ++ "/" ++ FLU_str,
Dst1 = MyPreserveDir ++ "/" ++ FLU_str ++ ".config",
lager:info("Stopped FLU ~w: rename ~s ~s\n",
[FLU, Src1, Dst1]),
_ = file:rename(Src1, Dst1),
Src2 = FluDataDir ++ "/" ++ FLU_str,
Dst2 = MyPreserveDir ++ "/" ++ FLU_str ++ ".data",
lager:info("Stopped FLU ~w: rename ~s ~s\n",
[FLU, Src2, Dst2]),
_ = file:rename(Src2, Dst2),
ok
end || FLU <- LocalRemovedFLUs]
end,
#chain_def_v1{name=Name} = CD,
_ = move_to_chain_config(Name, File, S),
if ChainConfigAction == move ->
_ = move_to_chain_config(Name, File, S);
ChainConfigAction == delete ->
_ = delete_chain_config(Name, File, S)
end,
S.
process_bad_files(Files, S) ->
@ -591,3 +625,20 @@ move_to_chain_config(Name, File, S) ->
Dst = get_chain_config_dir(S),
ok = file:rename(File, Dst ++ "/" ++ atom_to_list(Name)),
S.
delete_chain_config(Name, File, S) ->
lager:info("Deleting chain config file ~w for chain ~w\n", [File, Name]),
Dst = get_chain_config_dir(S),
ok = file:delete(Dst ++ "/" ++ atom_to_list(Name)),
S.
get_current_chain_for_running_flus(#chain_def_v1{name=Name}, RunningFLUs) ->
FLU_CurChs = [begin
PStore = machi_flu1:make_projection_server_regname(FLU),
{ok, #projection_v1{chain_name=Ch}} =
machi_projection_store:read_latest_projection(
PStore, private),
{FLU, Ch}
end || FLU <- RunningFLUs],
[FLU || {FLU, CurChain} <- FLU_CurChs,
CurChain == Name].