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mgt: persist domain data into khepri #177

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Aug 15, 2024
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mgt: persist domain data into khepri #177

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93 changes: 42 additions & 51 deletions apps/virtuerl/src/virtuerl_mgt.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,8 @@
handle_continue/2]).

-include_lib("kernel/include/logger.hrl").
-include_lib("khepri/include/khepri.hrl").
-include_lib("khepri/src/khepri_error.hrl").

-define(SERVER, ?MODULE).
-define(APPLICATION, virtuerl).
Expand Down Expand Up @@ -87,16 +89,13 @@ start_link() ->


init([]) ->
{ok, Table} = dets:open_file(domains, [{file, filename:join(home_path(), "domains.dets")}]),
%% virtuerl_ipam:ipam_put_net({default, <<192:8, 168:8, 10:8, 0:8>>, 28}),
%% application:ensure_all_started(grpcbox),
net_kernel:monitor_nodes(true),
{ok, #state{table = Table, idmap = #{}}, {continue, sync_domains}}.
%% {ok, {Table}}.
{ok, #state{idmap = #{}}, {continue, sync_domains}}.


handle_continue(sync_domains, #state{table = Table, idmap = IdMap} = State) ->
Domains = dets:match_object(Table, '_'),
handle_continue(sync_domains, #state{idmap = IdMap} = State) ->
{ok, DomainsMap} = khepri:get_many([domain, ?KHEPRI_WILDCARD_STAR]),
Domains = [ {Id, Dom} || #{id := Id} = Dom <- maps:values(DomainsMap) ],
TargetDomains = maps:from_list(
[ {Id, case maps:get(host, Domain, localhost) of localhost -> node(); Else -> Else end}
|| {Id, Domain} <- Domains,
Expand Down Expand Up @@ -145,7 +144,6 @@ generate_unique_tap_name(TapNames) ->


handle_call({domain_create, Conf}, _From, State) ->
#state{table = Table} = State,
DomainID = virtuerl_util:uuid4(),
Domain0 = maps:merge(#{
id => DomainID,
Expand All @@ -163,8 +161,7 @@ handle_call({domain_create, Conf}, _From, State) ->
#{os_type := "windows"} ->
maps:merge(#{setup_iso => "Win11_23H2_EnglishInternational_x64v2_noprompt.iso"}, Domain0)
end,
dets:insert_new(Table, {DomainID, Domain}),
dets:sync(Table),
ok = khepri:create([domain, DomainID], Domain),
?LOG_NOTICE(#{event => domain_requested, domain => Domain}),

#{network_id := NetworkID} = Domain,
Expand Down Expand Up @@ -201,7 +198,8 @@ handle_call({domain_create, Conf}, _From, State) ->
Ipv4Addr = maps:get(ipv4_addr, AddressesMap, undefined),
Ipv6Addr = maps:get(ipv6_addr, AddressesMap, undefined),

Domains = dets:match_object(Table, '_'),
{ok, DomainsMap} = khepri:get_many([domain, ?KHEPRI_WILDCARD_STAR]),
Domains = maps:values(DomainsMap),
TapNames = sets:from_list([ Tap || #{tap_name := Tap} <- Domains ]),
TapName = generate_unique_tap_name(TapNames), % TODO: TapName should be generated on a per-deployment basis
<<A:5, _:3, B:40>> = <<(rand:uniform(16#ffffffffffff)):48>>,
Expand All @@ -215,8 +213,7 @@ handle_call({domain_create, Conf}, _From, State) ->
cidrs => IpCidrs,
tap_name => TapName
},
dets:insert(Table, {DomainID, DomainWithIps}),
dets:sync(Table),
ok = khepri:put([domain, DomainID], DomainWithIps),
?LOG_NOTICE(#{event => domain_ready, domain => DomainWithIps}),
virtuerl_pubsub:send({domain_created, DomainID}),

Expand All @@ -225,55 +222,49 @@ handle_call({domain_create, Conf}, _From, State) ->
maps:map(fun(_, V) -> iolist_to_binary(virtuerl_net:format_ip(V)) end, AddressesMap))},
State,
{continue, sync_domains}};
handle_call({domain_update, #{id := DomainID} = DomainUpdate0}, _From, #state{table = Table} = State) ->
handle_call({domain_update, #{id := DomainID} = DomainUpdate0}, _From, State) ->
DomainUpdate = maps:remove(id, DomainUpdate0),
Reply = case dets:lookup(Table, DomainID) of
[{_, Domain}] ->
ok = dets:insert(Table, {DomainID, maps:merge(Domain, DomainUpdate)}),
ok = dets:sync(Table),
Reply = case khepri:get([domain, DomainID]) of
{ok, Domain} ->
ok = khepri:put([domain, DomainID], maps:merge(Domain, DomainUpdate)),
virtuerl_pubsub:send({domain_updated, DomainID}),
ok;
[] -> {error, notfound}
_ -> {error, notfound}
end,
{reply, Reply, State, {continue, sync_domains}};
handle_call({add_port_fwd, DomId, PortFwd}, _From, #state{table = Table} = State) ->
Reply = case dets:lookup(Table, DomId) of
[{_, Domain}] ->
handle_call({add_port_fwd, DomId, PortFwd}, _From, State) ->
Reply = case khepri:get([domain, DomId]) of
{ok, Domain} ->
NewFwds = case Domain of
#{port_fwds := Fwds} -> Fwds;
_ -> []
end,
DomainUpdate = #{port_fwds => [PortFwd | NewFwds]},
ok = dets:insert(Table, {DomId, maps:merge(Domain, DomainUpdate)}),
ok = dets:sync(Table),
ok = khepri:put([domain, DomId], maps:merge(Domain, DomainUpdate)),
virtuerl_pubsub:send({domain_updated, DomId}),
ok;
[] -> {error, notfound}
_ -> {error, notfound}
end,
{reply, Reply, State, {continue, sync_domains}};
handle_call(domains_list, _From, State) ->
#state{table = Table} = State,
Domains = dets:match_object(Table, '_'),
{reply, [ maps:merge(#{host => localhost, state => running, name => Id, vcpu => 1, memory => 512}, Domain) || {Id, Domain} <- Domains ], State};
{ok, DomainsMap} = khepri:get_many([domain, ?KHEPRI_WILDCARD_STAR]),
Domains = maps:values(DomainsMap),
{reply, [ maps:merge(#{host => localhost, state => running, name => Id, vcpu => 1, memory => 512}, Domain) || #{id := Id} = Domain <- Domains ], State};
handle_call({domain_get, #{id := DomainID}}, _From, State) ->
#state{table = Table} = State,
Reply = case dets:lookup(Table, DomainID) of
[{_, #{mac_addr := MacAddr, tap_name := TapName} = Domain}] ->
Reply = case khepri:get([domain, DomainID]) of
{ok, #{mac_addr := MacAddr, tap_name := TapName} = Domain} ->
DomRet = Domain#{
mac_addr := binary:encode_hex(MacAddr),
tap_name := iolist_to_binary(TapName)
},
{ok, maps:merge(#{host => localhost, state => running, name => DomainID, vcpu => 1, memory => 512}, DomRet)};
[] -> notfound
_ -> notfound
end,
{reply, Reply, State};
handle_call({domain_delete, #{id := DomainID}}, _From, State) ->
#state{table = Table} = State,
Res = case dets:lookup(Table, DomainID) of
[] -> {error, notfound};
[{_, Domain}] ->
dets:insert(Table, {DomainID, Domain#{state => deleting}}),
dets:sync(Table),
Res = case khepri:get([domain, DomainID]) of
{ok, Domain} ->
ok = khepri:put([domain, DomainID], Domain#{state => deleting}),
spawn_link(fun() ->
TargetNode = case Domain of
#{host := localhost} -> node();
Expand All @@ -290,16 +281,17 @@ handle_call({domain_delete, #{id := DomainID}}, _From, State) ->
% TODO: we don't really have to delete unused tap here as they will be deleted before the next domain is created
% however, it's of course cleaner to do so here, so consider adding it back
% ok = gen_server:call(virtuerl_net, {net_update}),
dets:delete(Table, DomainID),
ok = khepri:delete([domain, DomainID]),
virtuerl_pubsub:send({domain_deleted, DomainID})
end),
ok
ok;
_ -> {error, notfound}

end,
{reply, Res, State};
handle_call({image_from_domain, #{id := DomainID, image_name := ImageName}}, _From, #state{table = Table} = State) ->
case dets:lookup(Table, DomainID) of
[] -> gen_server:reply(_From, {error, notfound});
[{_, Domain}] ->
handle_call({image_from_domain, #{id := DomainID, image_name := ImageName}}, _From, State) ->
case khepri:get([domain, DomainID]) of
{ok, Domain} ->
spawn(fun() ->
#{state := DomState} = Domain,
case DomState of
Expand All @@ -320,7 +312,8 @@ handle_call({image_from_domain, #{id := DomainID, image_name := ImageName}}, _Fr
end,

gen_server:reply(_From, ok)
end)
end);
_ -> gen_server:reply(_From, {error, notfound})
end,
{noreply, State}.

Expand All @@ -333,12 +326,11 @@ handle_info({nodedown, _Node}, State) ->
{noreply, State};
handle_info({nodeup, _Node}, State) ->
{noreply, State, {continue, sync_domains}};
handle_info({'DOWN', _, process, Pid, normal}, #state{table = Table, idmap = IdMap} = State) ->
handle_info({'DOWN', _, process, Pid, normal}, #state{idmap = IdMap} = State) ->
NewIdMap = case IdMap of
#{Pid := DomId} ->
[{DomId, Domain}] = dets:lookup(Table, DomId), % TODO: this is empty for a deleted domain
ok = dets:insert(Table, {DomId, Domain#{state => stopped}}),
ok = dets:sync(Table),
{ok, Domain} = khepri:get([domain, DomId]), % TODO: this is empty for a deleted domain
ok = khepri:put([domain, DomId], Domain#{state => stopped}),
maps:remove(Pid, IdMap);
#{} ->
?LOG_WARNING(#{module => ?MODULE, msg => "process down but not in registry", pid => Pid}),
Expand All @@ -350,8 +342,7 @@ handle_info(Info, State) ->
{noreply, State}.


terminate(_Reason, #state{table = Table}) ->
dets:close(Table),
terminate(_Reason, _State) ->
ok.


Expand Down