diff options
Diffstat (limited to 'components/dlink_sms/src/dlink_sms_rpc.erl')
| -rw-r--r-- | components/dlink_sms/src/dlink_sms_rpc.erl | 773 |
1 files changed, 773 insertions, 0 deletions
diff --git a/components/dlink_sms/src/dlink_sms_rpc.erl b/components/dlink_sms/src/dlink_sms_rpc.erl new file mode 100644 index 0000000..78630ae --- /dev/null +++ b/components/dlink_sms/src/dlink_sms_rpc.erl @@ -0,0 +1,773 @@ +%% +%% Copyright (C) 2014, Jaguar Land Rover +%% +%% This program is licensed under the terms and conditions of the +%% Mozilla Public License, version 2.0. The full text of the +%% Mozilla Public License is at https://www.mozilla.org/MPL/2.0/ +%% + + +-module(dlink_sms_rpc). +-behavior(gen_server). + +-export([handle_rpc/2]). +-export([handle_notification/2]). +-export([handle_sms/4]). +-export([handle_sms/5]). + +-export([start_link/0]). +-export([init/1, handle_call/3, handle_cast/2, handle_info/2, + terminate/2, code_change/3]). + +-export([start_json_server/0]). +-export([start_connection_manager/0]). + +%% Invoked by service discovery +%% FIXME: Should be rvi_service_discovery behavior +-export([service_available/3, + service_unavailable/3]). + +-export([setup_data_link/3, + disconnect_data_link/2, + send_data/5]). + + +-include_lib("lager/include/log.hrl"). +-include_lib("rvi_common/include/rvi_common.hrl"). +-include_lib("rvi_common/include/rvi_dlink.hrl"). +-include_lib("gsms/include/gsms.hrl"). + +-define(PERSISTENT_CONNECTIONS, persistent_connections). +-define(SERVER_OPTS, server_opts). +-define(DEFAULT_SMS_PORT, 0). +-define(DEFAULT_RECONNECT_INTERVAL, 5000). +-define(DEFAULT_SMS_ADDRESS, ""). +-define(DEFAULT_PING_INTERVAL, 300000). %% Five minutes +-define(SERVER, ?MODULE). +-define(DLINK_SMS_VERSION, "1.0"). + +-define(CONNECTION_TABLE, rvi_dlink_sms_connections). +-define(SERVICE_TABLE, rvi_dlink_sms_services). + +%% Multiple registrations of the same service, each with a different connection, +%% is possible. +-record(service_entry, { + service = [], %% Name of service + connections = undefined %% PID of connection that can reach this service + }). + +-record(connection_entry, { + connection = undefined, %% PID of connection that has a set of services. + services = [] %% List of service names available through this connection + }). + +-record(st, { + cs = #component_spec{} + }). + + +start_link() -> + gen_server:start_link({local, ?SERVER}, ?MODULE, [], []). + +init([]) -> + ?info("dlink_sms:init(): Called"), + gsms:subscribe([{reg_exp, "RVI:{.*\"cmd\":[[:space:]]*\"au\""}]), + %% Dig out the bert rpc server setup + + ets:new(?SERVICE_TABLE, [ set, public, named_table, + { keypos, #service_entry.service }]), + + ets:new(?CONNECTION_TABLE, [ set, public, named_table, + { keypos, #connection_entry.connection }]), + + CS = rvi_common:get_component_specification(), + service_discovery_rpc:subscribe(CS, ?MODULE), + + {ok, #st { + cs = CS + } + }. + +start_json_server() -> + rvi_common:start_json_rpc_server(data_link, ?MODULE, dlink_sms_sup). + + +start_connection_manager() -> + CompSpec = rvi_common:get_component_specification(), + ?info("dlink_sms:init_rvi_component(~p): Starting listener.", [self()]), + sms_connection_manager:start_link(), + ?info("dlink_sms:init_rvi_component(): Setting up persistent connections."), + {ok, PersistentConnections } = + rvi_common:get_module_config(data_link, + ?MODULE, + ?PERSISTENT_CONNECTIONS, + [], + CompSpec), + setup_persistent_connections_(PersistentConnections, CompSpec), + ok. + +setup_persistent_connections_([], _CompSpec) -> + ok; +setup_persistent_connections_([NetworkAddress|T], CompSpec) -> + ?debug("~p: Will persistently connect connect : ~p", + [self(), NetworkAddress]), + Addr = case string:tokens(NetworkAddress, ":") of + [A] -> A; + [A, _Port] -> A + end, + connect_and_retry_remote(Addr, CompSpec), + setup_persistent_connections_(T, CompSpec), + ok. + +service_available(CompSpec, SvcName, DataLinkModule) -> + rvi_common:notification(data_link, ?MODULE, + service_available, + [{ service, SvcName }, + { data_link_module, DataLinkModule }], + CompSpec). + +service_unavailable(CompSpec, SvcName, DataLinkModule) -> + rvi_common:notification(data_link, ?MODULE, + service_unavailable, + [{ service, SvcName }, + { data_link_module, DataLinkModule }], + CompSpec). + + +setup_data_link(CompSpec, Service, Opts) -> + rvi_common:request(data_link, ?MODULE, setup_data_link, + [ { service, Service }, + { opts, Opts }], + [status, timeout], CompSpec). + +disconnect_data_link(CompSpec, NetworkAddress) -> + rvi_common:request(data_link, ?MODULE, disconnect_data_link, + [ {network_address, NetworkAddress} ], + [status], CompSpec). + + +send_data(CompSpec, ProtoMod, Service, DataLinkOpts, Data) -> + rvi_common:request(data_link, ?MODULE, send_data, + [ { proto_mod, ProtoMod }, + { service, Service }, + { data, Data }, + { opts, DataLinkOpts } + ], + [status], CompSpec). + + +%% End of behavior + +%% +%% Connect to a remote RVI node. +%% +connect_remote(Addr, CompSpec) -> + ?info("connect_remote(~p)~n", [Addr]), + case sms_connection_manager:find_connection_by_address(Addr) of + { ok, _Pid } -> + already_connected; + + not_found -> + %% Setup a new outbound connection + ?info("dlink_sms:connect_remote(): Connecting ~p", + [Addr]), + + %% We don't actually connect, since SMS is not session-based + %% Set up a genserver around the new connection. + {ok, Pid } = setup_connection(Addr, CompSpec), + %% Send authorize + LocalAddr = rvi_common:node_msisdn(), + sms_connection:send_auth( + Pid, + term_to_json( + {struct, [{ ?DLINK_ARG_TRANSACTION_ID, 1 }, + { ?DLINK_ARG_CMD, ?DLINK_CMD_AUTHORIZE }, + { ?DLINK_ARG_ADDRESS, LocalAddr }, + { ?DLINK_ARG_VERSION, ?DLINK_SMS_VERSION }, + { ?DLINK_ARG_CERTIFICATES, + {array, get_certificates(CompSpec)} }, + { ?DLINK_ARG_SIGNATURE, get_authorize_jwt(CompSpec) } + ]})), + ok; + {error, Err } -> + ?info("dlink_sms:connect_remote(): Failed ~p: ~p", + [Addr, Err]), + not_available + end. + +setup_connection(Addr, CompSpec) -> + setup_connection(Addr, [], CompSpec). + +setup_connection(Addr, Msgs, CompSpec) -> + sms_connection:setup(Addr, Msgs, ?MODULE, handle_sms, [CompSpec]). + +connect_and_retry_remote(Addr, CompSpec) -> + ?info("dlink_sms:connect_and_retry_remote(): ~p", + [Addr]), + + case connect_remote(Addr, CompSpec) of + ok -> ok; + + Err -> %% Failed to connect. Sleep and try again + ?notice("dlink_sms:connect_and_retry_remote(~p): Failed: ~p", + [Addr, Err]), + + ?notice("dlink_sms:connect_and_retry_remote(~p): Will try again in ~p sec", + [Addr, ?DEFAULT_RECONNECT_INTERVAL]), + + setup_reconnect_timer(?DEFAULT_RECONNECT_INTERVAL, Addr, CompSpec), + + not_available + end. + + +announce_local_service_(_CompSpec, [], _Service, _Availability) -> + ok; + +announce_local_service_(CompSpec, + [ConnPid | T], + Service, Availability) -> + + [ ok, JWT ] = authorize_rpc:sign_message( + CompSpec, availability_msg(Availability, [Service])), + Res = sms_connection:send( + ConnPid, + term_to_json( + {struct, + [ { ?DLINK_ARG_TRANSACTION_ID, 1 }, + { ?DLINK_ARG_CMD, ?DLINK_CMD_SERVICE_ANNOUNCE }, + { ?DLINK_ARG_SIGNATURE, JWT } + ]})), + + ?debug("dlink_sms:announce_local_service(~p: ~p) -> ~p Res: ~p", + [ Availability, Service, ConnPid, Res]), + + %% Move on to next connection. + announce_local_service_(CompSpec, + T, + Service, Availability). + +announce_local_service_(CompSpec, Service, Availability) -> + announce_local_service_(CompSpec, + get_connections(), + Service, Availability). + +%% We lost the socket connection. +%% Unregister all services that were routed to the remote end that just died. +handle_sms(FromPid, Addr, closed, [CompSpec]) -> + ?info("dlink_sms:closed(): Address: ~p", [Addr]), + + %% Get all service records associated with the given connection + LostSvcNameList = get_services_by_connection(FromPid), + + delete_connection(FromPid), + + %% Check if this was our last connection supporting each given service. + lists:map( + fun(SvcName) -> + case get_connections_by_service(SvcName) of + [] -> + service_discovery_rpc: + unregister_services(CompSpec, + [SvcName], + ?MODULE); + _ -> ok + end + end, LostSvcNameList), + + {ok, PersistentConnections } = rvi_common:get_module_config(data_link, + ?MODULE, + persistent_connections, + [], + CompSpec), + %% Check if this is a static node. If so, setup a timer for a reconnect + case lists:member(Addr, PersistentConnections) of + true -> + ?info("dlink_sms:closed(): Reconnect address: ~p", [Addr]), + ?info("dlink_sms:closed(): Reconnect interval: ~p", [ ?DEFAULT_RECONNECT_INTERVAL ]), + setup_reconnect_timer(?DEFAULT_RECONNECT_INTERVAL, + Addr, CompSpec); + false -> ok + end, + ok; + +handle_sms(_FromPid, Addr, error, _ExtraArgs) -> + ?info("dlink_sms:socket_error(): Address: ~p", [Addr]), + ok. + +handle_sms(FromPid, Addr, data, Payload, [CompSpec]) -> + + ?debug("dlink_sms:data(): Payload ~p", [Payload ]), + {ok, {struct, Elems}} = exo_json:decode_string(Payload), + + ?debug("dlink_sms:data(): Got ~p", [ Elems ]), + + case opt(?DLINK_ARG_CMD, Elems, undefined) of + ?DLINK_CMD_AUTHORIZE -> + [ TransactionID, + RemoteAddress, + ProtoVersion, + CertificatesTmp, + Signature ] = + opts([?DLINK_ARG_TRANSACTION_ID, + ?DLINK_ARG_ADDRESS, + ?DLINK_ARG_VERSION, + ?DLINK_ARG_CERTIFICATES, + ?DLINK_ARG_SIGNATURE], + Elems, undefined), + + Certificates = + case CertificatesTmp of + {array, C} -> C; + undefined -> [] + end, + process_authorize(FromPid, Addr, TransactionID, RemoteAddress, + ProtoVersion, Signature, Certificates, CompSpec); + + ?DLINK_CMD_SERVICE_ANNOUNCE -> + [ TransactionID, + ProtoVersion, + Signature ] = + opts([?DLINK_ARG_TRANSACTION_ID, + ?DLINK_ARG_VERSION, + ?DLINK_ARG_SIGNATURE], + Elems, undefined), + + Conn = {Addr, 0}, + case authorize_rpc:validate_message(CompSpec, Signature, Conn) of + [ok, Msg] -> + process_announce(Msg, FromPid, Addr, + TransactionID, ProtoVersion, CompSpec); + _ -> + ?debug("Couldn't validate availability msg from ~p", [Conn]) + end; + + ?DLINK_CMD_RECEIVE -> + [ _TransactionID, + ProtoMod, + Data ] = + opts([?DLINK_ARG_TRANSACTION_ID, + ?DLINK_ARG_MODULE, + ?DLINK_ARG_DATA], + Elems, undefined), + process_data(FromPid, Addr, ProtoMod, Data, CompSpec); + + ?DLINK_CMD_PING -> + ?info("dlink_sms:ping(): Pinged from: ~p", [Addr]), + ok; + + undefined -> + ?warning("dlink_sms:data() cmd undefined, ~p", [Elems]), + ok + end. + +%% JSON-RPC entry point +%% CAlled by local exo http server +handle_notification("service_available", Args) -> + {ok, SvcName} = rvi_common:get_json_element(["service"], Args), + {ok, DataLinkModule} = rvi_common:get_json_element(["data_link_module"], Args), + + gen_server:cast(?SERVER, { rvi, service_available, + [ SvcName, + DataLinkModule ]}), + + ok; +handle_notification("service_unavailable", Args) -> + {ok, SvcName} = rvi_common:get_json_element(["service"], Args), + {ok, DataLinkModule} = rvi_common:get_json_element(["data_link_module"], Args), + + gen_server:cast(?SERVER, { rvi, service_unavailable, + [ SvcName, + DataLinkModule ]}), + + ok; + +handle_notification(Other, _Args) -> + ?info("dlink_sms:handle_notification(~p): unknown", [ Other ]), + ok. + +handle_rpc("setup_data_link", Args) -> + { ok, Service } = rvi_common:get_json_element(["service"], Args), + + { ok, Opts } = rvi_common:get_json_element(["opts"], Args), + + [ Res, Timeout ] = gen_server:call(?SERVER, { rvi, setup_data_link, + [ Service, Opts ] }), + + {ok, [ {status, rvi_common:json_rpc_status(Res)} , { timeout, Timeout }]}; + +handle_rpc("disconnect_data_link", Args) -> + { ok, NetworkAddress} = rvi_common:get_json_element(["network_address"], Args), + [Res] = gen_server:call(?SERVER, { rvi, disconnect_data_link, [NetworkAddress]}), + {ok, [ {status, rvi_common:json_rpc_status(Res)} ]}; + +handle_rpc("send_data", Args) -> + { ok, ProtoMod } = rvi_common:get_json_element(["proto_mod"], Args), + { ok, Service } = rvi_common:get_json_element(["service"], Args), + { ok, Data } = rvi_common:get_json_element(["data"], Args), + { ok, DataLinkOpts } = rvi_common:get_json_element(["opts"], Args), + [ Res ] = gen_server:call(?SERVER, { rvi, send_data, [ProtoMod, Service, Data, DataLinkOpts]}), + {ok, [ {status, rvi_common:json_rpc_status(Res)} ]}; + + +handle_rpc(Other, _Args) -> + ?info("dlink_sms:handle_rpc(~p): unknown", [ Other ]), + { ok, [ { status, rvi_common:json_rpc_status(invalid_command)} ] }. + + +handle_cast( {rvi, service_available, [SvcName, local]}, St) -> + ?debug("dlink_sms:service_available(): ~p (local)", [ SvcName ]), + announce_local_service_(St#st.cs, SvcName, available), + {noreply, St}; + + +handle_cast( {rvi, service_available, [SvcName, Mod]}, St) -> + ?debug("dlink_sms:service_available(): ~p (~p) ignored", [ SvcName, Mod ]), + %% We don't care about remote services available through + %% other data link modules + {noreply, St}; + + +handle_cast( {rvi, service_unavailable, [SvcName, local]}, St) -> + announce_local_service_(St#st.cs, SvcName, unavailable), + {noreply, St}; + +handle_cast( {rvi, service_unavailable, [_SvcName, _]}, St) -> + %% We don't care about remote services available through + %% other data link modules + {noreply, St}; + + +handle_cast(Other, St) -> + ?warning("dlink_sms:handle_cast(~p): unknown", [ Other ]), + {noreply, St}. + + +handle_call({rvi, setup_data_link, [ Service, Opts ]}, _From, St) -> + %% Do we already have a connection that support service? + ?info("dlink_sms: setup_data_link (~p, ~p)~n", [Service, Opts]), + case get_connections_by_service(Service) of + [] -> %% Nop[e + case proplists:get_value(target, Opts, undefined) of + undefined -> + ?info("dlink_sms:setup_data_link(~p) Failed: no target given in options.", + [Service]), + { reply, [ok, -1 ], St }; + + Addr -> + case connect_remote(Addr, St#st.cs) of + ok -> + { reply, [ok, 2000], St }; %% 2 second timeout + + already_connected -> %% We are already connected + { reply, [already_connected, -1], St }; + + Err -> + { reply, [Err, 0], St } + end + end; + + _ -> %% Yes - We do have a connection that knows of service + { reply, [already_connected, -1], St } + end; + + +handle_call({rvi, disconnect_data_link, [Address] }, _From, St) -> + Res = sms_connection:terminate_connection(Address), + { reply, [ Res ], St }; + + +handle_call({rvi, send_data, [ProtoMod, Service, Data, _DataLinkOpts]}, _From, St) -> + + %% Resolve connection pid from service + case get_connections_by_service(Service) of + [] -> + { reply, [ no_route ], St}; + + %% FIXME: What to do if we have multiple connections to the same service? + [ConnPid | _T] -> + Res = sms_connection:send(ConnPid, {receive_data, ProtoMod, Data}), + { reply, [ Res ], St} + end; + + + + +handle_call({setup_initial_ping, Address, Pid}, _From, St) -> + %% Create a timer to handle periodic pings. + {ok, ServerOpts } = rvi_common:get_module_config(data_link, + ?MODULE, + ?SERVER_OPTS, [], + St#st.cs), + Timeout = proplists:get_value( + ping_interval, ServerOpts, ?DEFAULT_PING_INTERVAL), + ?info("dlink_sms:setup_ping(): ~p will be pinged every ~p msec", + [Address, Timeout]), + erlang:send_after(Timeout, self(), {rvi_ping, Pid, Address, Timeout}), + {reply, ok, St}; + +handle_call(Other, _From, St) -> + ?warning("dlink_sms:handle_rpc(~p): unknown", [Other]), + {reply, {ok, [{status, rvi_common:json_rpc_status(invalid_command)}]}, St}. + +%% Ping time +handle_info({rvi_ping, Pid, Address, Timeout}, St) -> + %% Check that connection is up + case sms_connection:is_connection_up(Pid) of + true -> + ?info("dlink_sms:ping(): Pinging: ~p", [Address]), + sms_connection:send(Pid, ping), + erlang:send_after(Timeout, self(), + {rvi_ping, Pid, Address, Timeout}); + false -> + ok + end, + {noreply, St}; + +%% Setup static nodes +handle_info({ rvi_setup_persistent_connection, Addr, CompSpec }, St) -> + ?info("rvi_setup_persistent_connection, ~p~n", [Addr]), + connect_and_retry_remote(Addr, CompSpec), + {noreply, St}; + +handle_info({gsms, _Ref, #gsms_deliver_pdu{ + addr = #gsms_addr{addr = Addr}}} = Msg, + #st{cs = CompSpec} = St) -> + case sms_connection_manager:find_connection_by_address(Addr) of + not_found -> + {ok, _} = setup_connection(Addr, [Msg], CompSpec); + Pid when is_pid(Pid) -> + ignore %% connection should have its own subscription + end, + {noreply, St}; + +handle_info(Info, St) -> + ?notice("dlink_sms(): Unknown message: ~p", [ Info]), + {noreply, St}. + +terminate(_Reason, _St) -> + ok. +code_change(_OldVsn, St, _Extra) -> + {ok, St}. + +setup_reconnect_timer(MSec, Addr, CompSpec) -> + erlang:send_after(MSec, ?MODULE, + { rvi_setup_persistent_connection, + Addr, CompSpec }), + ok. + +get_services_by_connection(ConnPid) -> + case ets:lookup(?CONNECTION_TABLE, ConnPid) of + [ #connection_entry { services = SvcNames } ] -> + SvcNames; + [] -> [] + end. + + +get_connections_by_service(Service) -> + case ets:lookup(?SERVICE_TABLE, Service) of + [ #service_entry { connections = Connections } ] -> + Connections; + [] -> [] + end. + + +add_services(SvcNameList, ConnPid) -> + %% Create or replace existing connection table entry + %% with the sum of new and old services. + ets:insert(?CONNECTION_TABLE, + #connection_entry { + connection = ConnPid, + services = SvcNameList ++ get_services_by_connection(ConnPid) + }), + + %% Add the connection to the service entry for each servic. + [ ets:insert(?SERVICE_TABLE, + #service_entry { + service = SvcName, + connections = [ConnPid | get_connections_by_service(SvcName)] + }) || SvcName <- SvcNameList ], + ok. + + +delete_services(ConnPid, SvcNameList) -> + ets:insert(?CONNECTION_TABLE, + #connection_entry { + connection = ConnPid, + services = get_services_by_connection(ConnPid) -- SvcNameList + }), + + %% Loop through all services and update the conn table + %% Update them with a new version where ConnPid has been removed + [ ets:insert(?SERVICE_TABLE, + #service_entry { + service = SvcName, + connections = get_connections_by_service(SvcName) -- [ConnPid] + }) || SvcName <- SvcNameList ], + ok. + +availability_msg(Availability, Services) -> + {struct, [{ ?DLINK_ARG_STATUS, status_string(Availability) }, + { ?DLINK_ARG_SERVICES, {array, Services} }]}. + +status_string(available ) -> ?DLINK_ARG_AVAILABLE; +status_string(unavailable) -> ?DLINK_ARG_UNAVAILABLE. + +process_authorize(FromPid, PeerAddr, TransactionID, RemoteAddress, + ProtoVersion, Signature, Certificates, CompSpec) -> + ?info("dlink_sms:authorize(): Peer Address: ~p" , [PeerAddr]), + ?info("dlink_sms:authorize(): Remote Address: ~p" , [RemoteAddress]), + ?info("dlink_sms:authorize(): Protocol Ver: ~p" , [ProtoVersion]), + ?debug("dlink_sms:authorize(): TransactionID: ~p", [TransactionID]), + ?debug("dlink_sms:authorize(): Signature: ~p", [Signature]), + + Conn = {PeerAddr, 0}, % add dummy port (necessary?) + case validate_auth_jwt(Signature, Certificates, Conn, CompSpec) of + true -> + connection_authorized(FromPid, Conn, CompSpec); + false -> + %% close connection (how?) + false + end. + +send_authorize(Pid, CompSpec) -> + LocalAddr = rvi_common:node_msisdn(), + sms_connection:send_auth( + Pid, + term_to_json( + {struct, + [ { ?DLINK_ARG_TRANSACTION_ID, 1 }, + { ?DLINK_ARG_CMD, ?DLINK_CMD_AUTHORIZE }, + { ?DLINK_ARG_ADDRESS, LocalAddr }, + { ?DLINK_ARG_VERSION, ?DLINK_SMS_VERSION }, + { ?DLINK_ARG_CERTIFICATES, {array, get_certificates(CompSpec)} }, + { ?DLINK_ARG_SIGNATURE, get_authorize_jwt(CompSpec) } ]})). + +connection_authorized(FromPid, {RemoteAddr, 0} = Conn, CompSpec) -> + %% If FromPid (the genserver managing the socket) is not yet registered + %% with the conneciton manager, this is an incoming connection + %% from the client. We should respond with our own authorize followed by + %% a service announce + case sms_connection:is_auth_sent(FromPid) of + false -> + ?debug("dlink_sms:authorize(): Sending authorize."), + Res = send_authorize(FromPid, CompSpec), + ?debug("dlink_sms:authorize(): Sending authorize: ~p", [ Res]), + ok; + true -> ok + end, + + %% Send our own servide announcement to the remote server + %% that just authorized to us. + [ok, LocalServices] = service_discovery_rpc:get_services_by_module(CompSpec, local), + + [ok, FilteredServices] = authorize_rpc:filter_by_destination( + CompSpec, LocalServices, Conn), + + %% Send an authorize back to the remote node + ?info("dlink_sms:authorize(): Announcing local services: ~p to remote ~p", + [FilteredServices, RemoteAddr]), + + [ok, JWT] = authorize_rpc:sign_message( + CompSpec, availability_msg(available, FilteredServices)), + sms_connection:send(FromPid, + term_to_json( + {struct, + [ { ?DLINK_ARG_TRANSACTION_ID, 1 }, + { ?DLINK_ARG_CMD, ?DLINK_CMD_SERVICE_ANNOUNCE }, + { ?DLINK_ARG_SIGNATURE, JWT } ]})), + + %% Setup ping interval + gen_server:call(?SERVER, {setup_initial_ping, RemoteAddr, FromPid }), + ok. + +process_data(_FromPid, RemoteAddr, ProtocolMod, Data, CompSpec) -> + ?debug("dlink_sms:receive_data(): RemoteAddr: ~p", [RemoteAddr]), + ?debug("dlink_sms:receive_data(): ~p:receive_message(~p)", [ ProtocolMod, Data ]), + Proto = list_to_existing_atom(ProtocolMod), + Proto:receive_message(CompSpec, RemoteAddr, + base64:decode_to_string(Data)). + +process_announce({struct, Elems}, FromPid, Addr, TID, _Vsn, CompSpec) -> + [ Avail, + {array, Svcs} ] = + opts([ ?DLINK_ARG_STATUS, ?DLINK_ARG_SERVICES ], Elems, undefined), + ?debug("dlink_sms:service_announce(~p): Address: ~p", [Avail,Addr]), + ?debug("dlink_sms:service_announce(~p): TransactionID: ~p", [Avail,TID]), + ?debug("dlink_sms:service_announce(~p): Services: ~p", [Avail,Svcs]), + case Avail of + ?DLINK_ARG_AVAILABLE -> + add_services(Svcs, FromPid), + service_discovery_rpc:register_services(CompSpec, Svcs, ?MODULE); + ?DLINK_ARG_UNAVAILABLE -> + delete_services(FromPid, Svcs), + service_discovery_rpc:unregister_services(CompSpec, Svcs, ?MODULE) + end, + ok. + +delete_connection(Conn) -> + %% Create or replace existing connection table entry + %% with the sum of new and old services. + SvcNameList = get_services_by_connection(Conn), + + %% Replace each existing connection entry that has + %% SvcName with a new one where the SvcName is removed. + lists:map(fun(SvcName) -> + Existing = get_connections_by_service(SvcName), + ets:insert(?SERVICE_TABLE, # + service_entry { + service = SvcName, + connections = Existing -- [ Conn ] + }) + end, SvcNameList), + + %% Delete the connection + ets:delete(?CONNECTION_TABLE, Conn), + ok. + +get_connections('$end_of_table', Acc) -> + Acc; + +get_connections(Key, Acc) -> + get_connections(ets:next(?CONNECTION_TABLE, Key), [ Key | Acc ]). + +get_connections() -> + get_connections(ets:first(?CONNECTION_TABLE), []). + +get_authorize_jwt(CompSpec) -> + case authorize_rpc:get_authorize_jwt(CompSpec) of + [ok, JWT] -> + JWT; + [not_found] -> + ?error("No authorize JWT~n", []), + error(cannot_authorize) + end. + +get_certificates(CompSpec) -> + case authorize_rpc:get_certificates(CompSpec) of + [ok, Certs] -> + Certs; + [not_found] -> + ?error("No certificate found~n", []), + error(no_certificate_found) + end. + +validate_auth_jwt(JWT, Certs, Conn, CompSpec) -> + case authorize_rpc:validate_authorization(CompSpec, JWT, Certs, Conn) of + [ok] -> + true; + [not_found] -> + false + end. + +term_to_json(Term) -> + binary_to_list(iolist_to_binary(exo_json:encode(Term))). + +opt(K, L, Def) -> + case lists:keyfind(K, 1, L) of + {_, V} -> V; + false -> Def + end. + +opts(Keys, Elems, Def) -> + [ opt(K, Elems, Def) || K <- Keys]. |