Merge pull request 'Add client name to connect msg, more descriptive 'disconnected' event' (#20) from uw-restart-logic into master

Reviewed-on: #20

.gitignore

@@ -19,7 +19,7 @@ VERSION
 *.aes~
 *.config~
 *.args~
-data/mnesia
+data/*
 _checkouts*/
 tmp/
 rebar3.crashdump

Makefile

@@ -0,0 +1,10 @@
+
+BUILD=_build/default/lib/gmhive_client
+SCHEMA_OUT=$(BUILD)/priv/gmhc_schema.json
+
+schema:
+	ERL_LIBS=_build/default/lib \
+	erl -run gmhc_config_schema export $(SCHEMA_OUT) -run init stop
+	scripts/update_readme_json.sh "README.md" "$(SCHEMA_OUT)"
+
+

README.md

@@ -82,6 +82,20 @@ only does this inform the client of the network for which the client should
 mine, but it also changes what URL the client will use to find the hive
 server. (For `"testnet"` this will be `"test.gajumining.com"`.)
 
+### Caching of connection data
+
+The client retrieves the Hive Server connection info from gajumining.com.
+This information is account-specific, and may change over time.
+
+To speed up the reconnecting process, should the Hive Server restart,
+this connection information is cached locally for up to 24 hours.
+The normal place for the cached data would be
+`$ZOMP_DIR//var/uwiger/gmhive_client/Vsn/setup.data/mainnet/gmhc_eureka.XXXXXXXX.cache`,
+where `Vsn` is the current version of `gmhive_client`, and `XXXXXXXX` is a fragment
+of the current account ID. The data location can be changed with the command-line
+option `-setup data_dir Dir`.
+
+
 ## JSON Schema
 
 ```json
@@ -89,6 +103,10 @@ server. (For `"testnet"` this will be `"test.gajumining.com"`.)
     "$schema": "http://json-schema.org/draft-04/schema#",
     "additionalProperties": false,
     "properties": {
+        "cache_dir": {
+            "description": "Location of cache, default is 'setup:data_dir()'",
+            "type": "string"
+        },
         "extra_pubkeys": {
             "default": [],
             "description": "Additional worker pubkeys, sharing rewards",
@@ -155,6 +173,16 @@ server. (For `"testnet"` this will be `"test.gajumining.com"`.)
             "pattern": "^ak_[1-9A-HJ-NP-Za-km-z]*$",
             "type": "string"
         },
+        "report": {
+            "default": "silent",
+            "description": "Progress reporting",
+            "enum": [
+                "debug",
+                "progress",
+                "silent"
+            ],
+            "type": "string"
+        },
         "type": {
             "default": "worker",
             "description": "monitor mode can be used to see if a pool is alive",
@@ -174,7 +202,7 @@ server. (For `"testnet"` this will be `"test.gajumining.com"`.)
                 "properties": {
                     "executable": {
                         "default": "mean29-generic",
-                        "description": "Executable binary of the worker. Can be a fully qualified path, but the software may apply default logic to locate a plain basename.",
+                        "description": "Executable binary of the worker. Can be a fully qualified path, \nbut the software may apply default logic to locate a plain basename.",
                         "type": "string"
                     },
                     "extra_args": {

ebin/gmhive_client.app

@@ -1,6 +1,6 @@
 {application,gmhive_client,
              [{description,"Gajumaru Hive Client"},
-              {vsn,"0.6.1"},
+              {vsn,"0.10.0"},
               {registered,[]},
               {applications,[kernel,stdlib,sasl,gproc,inets,ssl,enoise,
                              gmconfig,gmhive_protocol,gmhive_worker]},

gmhc_config-testnet-local.eterm

@@ -1,4 +1,5 @@
 #{ pubkey => <<"ak_zjyvDmMbXafMADYrxDs4uMiYM5zEVJBqWgv619NUQ37Gkwt7z">>
+ , report => <<"progress">>
  , pool_admin => #{url => <<"local">>}
  , pool => #{id => <<"ct_26xqeE3YKmZV8jrks57JSgZRCHSuG4RGzpnvdz6AAiSSTVbJRM">>,
              host => <<"127.0.0.1">>}

gmhc_config.eterm

@@ -1,5 +1,5 @@
 #{ pubkey => <<"ak_2KAcA2Pp1nrR8Wkt3FtCkReGzAi8vJ9Snxa4PcmrthVx8AhPe8">>
  , pool => #{id => <<"ct_LRbi65kmLtE7YMkG6mvG5TxAXTsPJDZjAtsPuaXtRyPA7gnfJ">>}
- , mining =>
+ , workers =>
        [#{executable => <<"mean15-generic">>}]
  }.

priv/gmhc_schema.json

@@ -0,0 +1,139 @@
+{
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "additionalProperties": false,
+    "properties": {
+        "cache_dir": {
+            "description": "Location of cache, default is 'setup:data_dir()'",
+            "type": "string"
+        },
+        "extra_pubkeys": {
+            "default": [],
+            "description": "Additional worker pubkeys, sharing rewards",
+            "items": {
+                "pattern": "^ak_[1-9A-HJ-NP-Za-km-z]*$",
+                "type": "string"
+            },
+            "type": "array"
+        },
+        "network": {
+            "default": "mainnet",
+            "type": "string"
+        },
+        "pool": {
+            "additionalProperties": false,
+            "properties": {
+                "host": {
+                    "default": "127.0.0.1",
+                    "description": "Hostname of hive server",
+                    "example": "0.0.0.0",
+                    "type": "string"
+                },
+                "id": {
+                    "description": "Pool contract id",
+                    "pattern": "^ct_[1-9A-HJ-NP-Za-km-z]*$",
+                    "type": "string"
+                },
+                "port": {
+                    "default": 17888,
+                    "description": "Hive server listen port",
+                    "minimum": 1,
+                    "type": "integer"
+                }
+            },
+            "type": "object"
+        },
+        "pool_admin": {
+            "additionalProperties": false,
+            "properties": {
+                "default_per_network": {
+                    "additionalProperties": false,
+                    "properties": {
+                        "mainnet": {
+                            "default": "https://gajumining.com/api/workers/{CLIENT_ID}",
+                            "type": "string"
+                        },
+                        "testnet": {
+                            "default": "https://test.gajumining.com/api/workers/{CLIENT_ID}",
+                            "type": "string"
+                        }
+                    },
+                    "type": "object"
+                },
+                "url": {
+                    "default": "https://test.gajumining.com/api/workers/{CLIENT_ID}",
+                    "description": "URL of Eureka worker api",
+                    "type": "string"
+                }
+            },
+            "type": "object"
+        },
+        "pubkey": {
+            "description": "Primary client pubkey",
+            "pattern": "^ak_[1-9A-HJ-NP-Za-km-z]*$",
+            "type": "string"
+        },
+        "report": {
+            "default": "silent",
+            "description": "Progress reporting",
+            "enum": [
+                "debug",
+                "progress",
+                "silent"
+            ],
+            "type": "string"
+        },
+        "type": {
+            "default": "worker",
+            "description": "monitor mode can be used to see if a pool is alive",
+            "enum": [
+                "worker",
+                "monitor"
+            ],
+            "type": "string"
+        },
+        "workers": {
+            "default": [
+                { "executable": "mean29-generic" }
+            ],
+            "description": "Definitions of workers' configurations. If no worker are configured one worker is used as default, i.e. 'mean29-generic' executable without any extra args.",
+            "items": {
+                "additionalProperties": false,
+                "properties": {
+                    "executable": {
+                        "default": "mean29-generic",
+                        "description": "Executable binary of the worker. Can be a fully qualified path, \nbut the software may apply default logic to locate a plain basename.",
+                        "type": "string"
+                    },
+                    "extra_args": {
+                        "default": "",
+                        "description": "Extra arguments to pass to the worker executable binary. The safest choice is specifying no arguments i.e. empty string.",
+                        "type": "string"
+                    },
+                    "hex_encoded_header": {
+                        "default": false,
+                        "description": "Hexadecimal encode the header argument that is send to the worker executable. CUDA executables expect hex encoded header.",
+                        "type": "boolean"
+                    },
+                    "instances": {
+                        "description": "Instances used by the worker in case of Multi-GPU mining. Numbers on the configuration list represent GPU devices that are to be addressed by the worker.",
+                        "example": [0,1,2,3],
+                        "items": { "type": "integer" },
+                        "minItems": 1,
+                        "type": "array"
+                    },
+                    "repeats": {
+                        "default": 1,
+                        "description": "Number of tries to do in each worker context - WARNING: it should be set so the worker process runs for 3-5s or else the node risk missing out on new micro blocks.",
+                        "type": "integer"
+                    }
+                },
+                "required": [
+                    "executable"
+                ],
+                "type": "object"
+            },
+            "type": "array"
+        }
+    },
+    "type": "object"
+}

rebar.config

@@ -5,11 +5,13 @@
 {erl_opts, [debug_info]}.
 {plugins, [rebar3_hex]}.
 
+{post_hooks, [{compile, "make schema"}]}.
+
 {deps, [
         {enoise, {git, "https://git.qpq.swiss/QPQ-AG/enoise.git", {ref, "029292817e"}}},
         {gmhive_protocol,
          {git, "https://git.qpq.swiss/QPQ-AG/gmhive_protocol.git",
-          {ref, "818ce33"}}},
+          {ref, "8d4652a"}}},
         {gmhive_worker, {git, "https://git.qpq.swiss/QPQ-AG/gmhive_worker", {ref, "cabd104114"}}},
         {gmconfig, {git, "https://git.qpq.swiss/QPQ-AG/gmconfig.git",
                     {ref, "38620ff9e2"}}},

rebar.lock

@@ -25,7 +25,7 @@
   1},
  {<<"gmhive_protocol">>,
   {git,"https://git.qpq.swiss/QPQ-AG/gmhive_protocol.git",
-       {ref,"818ce33cc1dec74c020515be48fb548a5207befd"}},
+       {ref,"8d4652a79a2ad8f51e1fe560c15c698d4c92485c"}},
   0},
  {<<"gmhive_worker">>,
   {git,"https://git.qpq.swiss/QPQ-AG/gmhive_worker",

scripts/update_readme_json.sh

@@ -0,0 +1,51 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+README="$1"
+SCHEMA="$2"
+
+if [[ ! -f "$README" || ! -f "$SCHEMA" ]]; then
+  echo "Usage: $0 README.md schema.json"
+  exit 1
+fi
+
+tmpfile=$(mktemp)
+
+awk -v schema_file="$SCHEMA" '
+  BEGIN {
+    in_json_block = 0
+    in_schema_section = 0
+  }
+
+  /^##[[:space:]]+JSON[[:space:]]+Schema/ {
+    in_schema_section = 1
+    print
+    next
+  }
+
+  /^##[[:space:]]+/ && in_schema_section {
+    # Another section starts, end the schema section
+    in_schema_section = 0
+  }
+
+  in_schema_section && /^```json/ {
+    print "```json"
+    while ((getline line < schema_file) > 0) print line
+    close(schema_file)
+    in_json_block = 1
+    next
+  }
+
+  in_json_block && /^```$/ {
+    print "```"
+    in_json_block = 0
+    next
+  }
+
+  !(in_schema_section && in_json_block) {
+    print
+  }
+' "$README" > "$tmpfile"
+
+mv "$tmpfile" "$README"
+echo "✅ Updated JSON schema block in $README"

src/gmhc_app.erl

@@ -1,6 +1,6 @@
 %% -*- mode: erlang; erlang-indent-level: 4; indent-tabs-mode: nil -*-
 -module(gmhc_app).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -behaviour(application).
 
@@ -17,11 +17,11 @@
 -spec start([{atom(), any()}]) -> {ok, [atom()]} | {error, any()}.
 start(Opts) ->
     application:load(gmhive_client),
-    {error,_} = application:stop(gmhive_client),
+    _ = application:stop(gmhive_client),
     _ = lists:foreach(fun({K, V}) ->
                               application:set_env(gmhive_client, K, V)
                       end, Opts),
-    application:ensure_all_started(gmhive_client).
+    application:ensure_all_started(gmhive_client, permanent).
 
 start(_StartType, _StartArgs) ->
     set_things_up(),
@@ -45,6 +45,7 @@ stop(_State) ->
     ok.
 
 set_things_up() ->
+    maybe_add_logger_handler(),
     gmhc_counters:initialize(),
     gmhc_config:load_config(),
     logger:set_module_level([gmhw_pow_cuckoo], notice),
@@ -59,3 +60,16 @@ set_things_up() ->
         _ -> ok
     end,
     ok.
+
+maybe_add_logger_handler() ->
+    case is_headless() orelse application:get_env(gmhive_client, tty_logger, false) of
+        true ->
+            Level = application:get_env(gmhive_client, tty_logger_level, error),
+            io:fwrite("Adding logger handler: ~p~n", [Level]),
+            logger:add_handler(gmhc_tty, logger_std_h, #{level => Level});
+        false ->
+            ok
+    end.
+
+is_headless() ->
+    undefined == application:get_key(gajumine, vsn).

src/gmhc_config.erl

@@ -1,5 +1,5 @@
 -module(gmhc_config).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -export([ load_config/0
         , get_config/1
@@ -14,8 +14,20 @@ load_config() ->
     gmconfig:apply_os_env(),
     gmconfig:process_plain_args(),
     check_application_env(),
+    check_final_config(),
     ok.
 
+check_final_config() ->
+    ExtraPubkeys = get_config([<<"extra_pubkeys">>]),
+    AllKeys = [get_config([<<"pubkey">>]) | ExtraPubkeys],
+    case AllKeys -- lists:usort(AllKeys) of
+        [] ->
+            ok;
+        Duplicates ->
+            ?LOG_ERROR("Duplicate account ids found: ~p", [Duplicates]),
+            error({duplicate_account_ids, Duplicates})
+    end.
+
 instrument_gmconfig() ->
     gmconfig:set_gmconfig_env(gmconfig_env()).
 

src/gmhc_config_schema.erl

@@ -1,8 +1,9 @@
 -module(gmhc_config_schema).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -export([ schema/0
-        , to_json/0 ]).
+        , to_json/0
+        , export/1 ]).
 
 -import(gmconfig_schema_helpers,
         [ str/1
@@ -22,6 +23,17 @@
 to_json() ->
     json:encode(schema()).
 
+export(ToFile) ->
+    case file:open(ToFile, [write]) of
+        {ok, Fd} ->
+            try ok = io:put_chars(Fd, json:format(schema(), #{indent => 4}))
+            after
+                file:close(Fd)
+            end;
+        {error, _} = Error ->
+            Error
+    end.
+
 schema() ->
     obj(schema_init(),
         #{
@@ -39,6 +51,7 @@ schema() ->
          , pool => pool()
          , pool_admin => pool_admin()
          , workers => workers()
+         , cache_dir => str(#{description => <<"Location of cache, default is 'setup:data_dir()'">>})
          , report => str(#{ enum  => [<<"debug">>, <<"progress">>, <<"silent">>]
                           , default => <<"silent">>
                           , description => <<"Progress reporting">> })

src/gmhc_connector.erl

@@ -1,5 +1,5 @@
 -module(gmhc_connector).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -behaviour(gen_server).
 
@@ -56,7 +56,11 @@
               id :: non_neg_integer()
             , auto_connect = true :: boolean()
             , econn
+            , connected = false :: boolean()
+            , status = disconnected :: disconnected | connecting | connected
+            , reconnect = true :: boolean()
             , reconnect_timer :: timer_ref() | 'undefined'
+            , recache_timer   :: reference() | 'undefined'
             , awaiting_connect = [] :: list()
             , protocol   :: binary() | 'undefined'
             , version    :: binary() | 'undefined'
@@ -141,6 +145,9 @@ init(#{id := Id} = Opts) when is_map(Opts) ->
                     {ok, S} ->
                         ?LOG_DEBUG("Initial connect succeeded", []),
                         S;
+                    {error, rejected} ->
+                        ?LOG_WARNING("Connection rejected; will not retry", []),
+                        S0#st{econn = undefined, reconnect = false};
                     {error, _} = Error ->
                         ?LOG_WARNING("Could not connect to core server: ~p", [Error]),
                         start_reconnect_timer(S0#st{econn = undefined})
@@ -179,6 +186,7 @@ handle_call({connect, Opts}, From, #st{awaiting_connect = Waiters} = S) ->
                                end,
                     S1 = start_reconnect_timer(
                            S#st{ auto_connect = true
+                               , reconnect = true
                                , awaiting_connect = Waiters1 }, Opts),
                     {noreply, S1};
                 false ->
@@ -239,12 +247,21 @@ handle_info({timeout, TRef, {reconnect, Opts}}, #st{ reconnect_timer = {TRef, _,
     end;
 handle_info({tcp_closed, _Port}, #st{} = S) ->
     ?LOG_DEBUG("got tcp_closed", []),
-    disconnected(S#st.id),
+    S1 = disconnected(S#st.id, S),
-    S1 = case S#st.auto_connect of
+    S2 = case S1#st.auto_connect of
-             true  -> start_reconnect_timer(S#st{econn = undefined});
+             true  -> start_reconnect_timer(S1#st{econn = undefined});
-             false -> S#st{econn = undefined}
+             false -> S1#st{econn = undefined}
          end,
-    {noreply, S1};
+    {noreply, S2};
+handle_info({timeout, _, recache}, #st{opts = Opts, econn = EConn} = S0) ->
+    S = S0#st{recache_timer = undefined},
+    case (EConn =/= undefined) andalso S#st.connected of
+        false ->
+            {noreply, S};
+        true ->
+            cache_eureka_info(Opts),
+            {noreply, ensure_recache_timer(S)}
+    end;
 handle_info(Msg, S) ->
     ?LOG_DEBUG("Discarding msg (auto_connect=~p): ~p", [S#st.auto_connect, Msg]),
     {noreply, S}.
@@ -264,6 +281,8 @@ code_change(_FromVsn, S, _Extra) ->
 try_connect(Opts, S) ->
     try try_connect_(Opts, S)
     catch
+        error:rejected:_ ->
+            {error, rejected};
         error:E:T ->
             ?LOG_ERROR("Unexpected error connecting: ~p / ~p", [E, T]),
             {error, E}
@@ -277,8 +296,9 @@ try_connect_(Opts0, S) ->
             case try_noise_connect(maps:merge(Opts0, PoolOpts)) of
                 {ok, EConn, Opts1} ->
                     S1 = protocol_connect(Opts1, S#st{ econn = EConn
+                                                     , status = connecting
                                                      , reconnect_timer = undefined }), 
-                    {ok, S1};
+                    {ok, S1#st{status = connected}};
                 {error, _} = Error ->
                     Error
             end
@@ -286,12 +306,12 @@ try_connect_(Opts0, S) ->
 
 eureka_get_host_port() ->
     case gmhc_eureka:get_pool_address() of
-        #{<<"address">> := Host,
+        {ok, #{host    := Host,
-          <<"port">>    := Port,
+               port    := Port,
-          <<"pool_id">> := PoolId} ->
+               pool_id := PoolId}} ->
-            #{host => binary_to_list(Host),
+            #{host => unicode:characters_to_list(Host),
               port => Port,
-              pool_id => binary_to_list(PoolId)};
+              pool_id => unicode:characters_to_list(PoolId)};
         {error, _} = Error ->
             Error
     end.
@@ -333,6 +353,8 @@ default_tcp_opts() ->
 enoise_opts() ->
     [{noise, <<"Noise_NN_25519_ChaChaPoly_BLAKE2b">>}].
 
+start_reconnect_timer(#st{reconnect = false} = S) ->
+    S;
 start_reconnect_timer(#st{} = S) ->
     start_reconnect_timer(S, #{}).
 
@@ -344,11 +366,18 @@ start_reconnect_timer(#st{} = S, Opts) ->
         false ->
             ?LOG_DEBUG("starting reconnect timer ...", []),
             TRef = start_timer(1000, Opts),
-            S#st{reconnect_timer = {TRef, 10, 1000, Opts}}
+            S#st{reconnect_timer = {TRef, 10, 8000 + gmhc_lib:rand(3000), Opts}}
     end.
 
+restart_reconnect_timer(#st{reconnect = false} = S) ->
+    cancel_reconnect_timer(S);
 restart_reconnect_timer(#st{reconnect_timer = {_, 0, T, Opts}} = S) ->
-    NewT = max(T * 2, ?MAX_RETRY_INTERVAL),
+    NewT = max(T + 5000 + gmhc_lib:rand(1000), ?MAX_RETRY_INTERVAL),
+    if (NewT > T andalso NewT =:= ?MAX_RETRY_INTERVAL) ->
+            gmhc_eureka:invalidate_cache();
+       true ->
+            ok
+    end,
     TRef = start_timer(NewT, Opts),
     S#st{reconnect_timer = {TRef, 10, NewT, Opts}};
 restart_reconnect_timer(#st{reconnect_timer = {_, N, T, Opts}} = S) ->
@@ -373,11 +402,25 @@ notify_deadline(D, #st{awaiting_connect = Waiters} = S) ->
                     end, [], Waiters),
     S#st{awaiting_connect = Waiters1}.
 
-notify_connected(#st{id = Id, awaiting_connect = Waiters} = S) ->
+cache_eureka_info(Opts) ->
+    gmhc_eureka:cache_good_address(maps:with([host, port, pool_id], Opts)).
+
+notify_connected(#st{id = Id, awaiting_connect = Waiters, opts = Opts} = S) ->
     gmhc_events:publish(connected, #{id => Id}),
     [gen_server:reply(From, ok) || {From, _} <- Waiters],
     gmhc_handler:pool_connected(S#st.id, S#st.opts),
-    S#st{awaiting_connect = []}.
+    cache_eureka_info(Opts),
+    gmhc_connectors_sup:add_restart_info(Id, Opts),
+    ensure_recache_timer(S#st{awaiting_connect = []}).
+
+ensure_recache_timer(#st{recache_timer = T} = S) ->
+    case T of
+        undefined ->
+            TRef = erlang:start_timer(1*60*1000, self(), recache),
+            S#st{recache_timer = TRef};
+        _ when is_reference(T) ->
+            S
+    end.
 
 cancel_reconnect_timer(#st{reconnect_timer = T} = S) ->
     case T of
@@ -401,17 +444,32 @@ protocol_connect(Opts, #st{econn = EConn} = S) ->
     Type   = to_atom(opt(type, Opts, [<<"type">>])),
     RId = erlang:unique_integer(),
     Vsns = gmhp_msgs:versions(),
+    Client = client_name(),
     Protocols = gmhp_msgs:protocols(hd(Vsns)),
     ConnectReq = #{ protocols => Protocols
                   , versions  => Vsns
                   , pool_id => PoolId
                   , pubkey => Pubkey
                   , extra_pubkeys => Extra
+                  , client => Client
                   , type => Type
                   , nonces => gmhc_server:total_nonces()
                   , signature => ""},
     ?LOG_DEBUG("ConnectReq = ~p", [ConnectReq]),
-    Msg = gmhp_msgs:encode_connect(ConnectReq, RId),
+    try gmhp_msgs:encode_connect(ConnectReq, RId) of
+        Msg ->
+            send_connect(EConn, RId, Msg, ConnectReq, Opts, S)
+    catch error:Error ->
+            ErrMsg = unicode:characters_to_binary(io_lib:fwrite("~p", [Error])),
+            disconnected(S#st.id, #{error =>
+                                        #{code    => gmhp_msgs:error_code(invalid_input),
+                                          message => ErrMsg}}, S)
+    end.
+
+send_connect(EConn, RId, Msg, #{pubkey        := Pubkey,
+                                extra_pubkeys := Extra,
+                                pool_id       := PoolId,
+                                type          := Type}, Opts, S) ->
     enoise:send(EConn, Msg),
     receive
         {noise, EConn, Data} ->
@@ -420,20 +478,41 @@ protocol_connect(Opts, #st{econn = EConn} = S) ->
                             , result := #{connect_ack := #{ protocol := P
                                                           , version  := V }}
                             }} ->
-                    connected(S#st.id, Type),
+                    S1 = connected(S#st.id, Type, S),
                     Opts1 = Opts#{ pubkey  => Pubkey
                                  , extra   => Extra
                                  , pool_id => PoolId
                                  , type    => Type },
-                    notify_connected(S#st{protocol = P, version = V, opts = Opts1});
+                    notify_connected(S1#st{protocol = P, version = V, opts = Opts1});
-                #{error := #{message := Msg}} ->
+                #{error := #{code := _, message := ErrMsg}} = ErrReply ->
-                    ?LOG_ERROR("Connect error: ~s", [Msg]),
+                    ?LOG_ERROR("Connect error: ~s", [ErrMsg]),
-                    error(protocol_connect)
+                    %% TODO: fix the flow so that we send one disconnected event,
+                    %% and set the reconnect in the right place. For now, stuff
+                    %% the `reconnect = false`.
+                    disconnected(S#st.id, ErrReply, S#st{reconnect = false}),
+                    gmhc_eureka:invalidate_cache(),
+                    error(rejected)
             end
     after 10000 ->
+            gmhc_eureka:invalidate_cache(),
             error(protocol_connect_timeout)
     end.
 
+client_name() ->
+    MyStr = app_string(gmhive_client),
+    case app_string(gajumine) of
+        <<>>  -> MyStr;
+        GMStr -> <<MyStr/binary,",",GMStr/binary>>
+    end.
+
+app_string(App) ->
+    case application:get_key(App, vsn) of
+        undefined ->
+            <<>>;
+        {ok, Vsn} ->
+            unicode:characters_to_binary([atom_to_binary(App),"-",Vsn])
+    end.
+
 to_bin(A) when is_atom(A) ->
     atom_to_binary(A, utf8);
 to_bin(S) ->
@@ -443,12 +522,18 @@ to_atom(A) when is_atom(A) -> A;
 to_atom(S) ->
     binary_to_existing_atom(iolist_to_binary(S), utf8).
 
-connected(Id, Type) when Type==worker; Type==monitor ->
+connected(Id, Type, S) when Type==worker; Type==monitor ->
-    gmhc_server:connected(Id, Type).
+    gmhc_server:connected(Id, Type),
+    S#st{connected = true}.
 
-disconnected(Id) ->
+disconnected(Id, S) ->
-    gmhc_events:publish(disconnected, #{id => Id}),
+    disconnected(Id, #{}, S).
-    gmhc_server:disconnected(Id).
+
+disconnected(_, _, #st{status = disconnected} = S) -> S;
+disconnected(Id, Msg, #st{reconnect = Bool} = S) ->
+    gmhc_events:publish(disconnected, Msg#{id => Id, reconnecting => Bool}),
+    gmhc_server:disconnected(Id),
+    S#st{connected = false, status = disconnected}.
 
 opt_autoconnect(#{auto_connect := Bool}) when is_boolean(Bool) ->
     Bool;

src/gmhc_connectors_sup.erl

@@ -1,15 +1,37 @@
 -module(gmhc_connectors_sup).
--vsn("0.6.1").
+-vsn("0.8.3").
 -behavior(supervisor).
 
 -export([ start_link/0
         , init/1 ]).
 
 -export([ start_first_connector/0
-        , start_connector/1]).
+        , start_connector/1
+        , add_restart_info/2 ]).
+
+-export([ sort_restart_info/1 ]).
+
+-include_lib("kernel/include/logger.hrl").
 
 start_link() ->
-    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+    case supervisor:start_link({local, ?MODULE}, ?MODULE, []) of
+        {ok, _} = Ok ->
+            RI0 = gmhc_watchdog:get_restart_info(),
+            ?LOG_ERROR("Restart info: ~p", [RI0]),
+            RI = sort_restart_info(RI0),
+            RemoveIds = maps:keys(maps:without(maps:keys(RI), RI0)),
+            gmhc_watchdog:remove_restart_info(RemoveIds),
+            ?LOG_ERROR("Sorted restart info: ~p", [RI]),
+            maps:foreach(fun restart_connector/2, RI),
+            Ok;
+        Other ->
+            Other
+    end.
+
+restart_connector({?MODULE, _}, Opts) ->
+    start_connector(Opts);
+restart_connector(_, _) ->
+    ok.
 
 start_first_connector() ->
     start_connector(#{}).
@@ -21,11 +43,14 @@ start_connector(Opts0) ->
            end,
     supervisor:start_child(?MODULE, [Opts]).
 
+add_restart_info(Id, Opts) ->
+    gmhc_watchdog:note_started({?MODULE, Id}, Opts).
+
 init([]) ->
     Mod = gmhc_connector,
     SupFlags = #{ strategy => simple_one_for_one
-                , intensity => 3
+                , intensity => 5
-                , period => 10 },
+                , period => 60 },
     ChildSpecs = [ #{ id => Mod
                     , start => {Mod, start_link, []}
                     , type => worker
@@ -33,3 +58,13 @@ init([]) ->
                     , shutdown => 5000
                     , modules => [Mod] } ],
     {ok, {SupFlags, ChildSpecs}}.
+
+sort_restart_info(RI) ->
+    L = lists:sort(
+          [{Id, {T,H,P}, I}
+           || {{?MODULE,_} = Id, #{type := T, host := H, port := P} = I} <- maps:to_list(RI)]),
+    ConnTypes = [CT || {_, CT, _} <- lists:ukeysort(2, L)],
+    lists:foldl(fun(CT, Acc) ->
+                        {Id, _, I} = lists:keyfind(CT, 2, L),
+                        Acc#{Id => I}
+                end, #{}, ConnTypes).

src/gmhc_counters.erl

@@ -1,5 +1,5 @@
 -module(gmhc_counters).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -export([ initialize/0 ]).
 

src/gmhc_eureka.erl

@@ -1,20 +1,136 @@
 -module(gmhc_eureka).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -export([get_pool_address/0]).
+-export([cache_good_address/1,
+         invalidate_cache/0,
+         cached_address/0,
+         cache_filename/0,
+         cache_dir/0]).
 
 -include_lib("kernel/include/logger.hrl").
 -include("gmhc_events.hrl").
 
 get_pool_address() ->
+    case cached_address() of
+        {ok, _} = Ok -> Ok;
+        {error, _} ->
+            get_pool_address_()
+    end.
+
+cached_address() ->
+    I0 = cache_info(),
+    CacheF = cache_filename(I0),
+    ?LOG_DEBUG("Eureka cache filename: ~p", [CacheF]),
+    case file:read_file(CacheF) of
+        {ok, Bin} ->
+            NowTS = erlang:system_time(seconds),
+            OldestTS = NowTS - 24*60*60,
+            try binary_to_term(Bin) of
+                #{ ts      := TS
+                 , network := N
+                 , pubkey  := PK
+                 , host    := _
+                 , port    := _
+                 , pool_id := _} = Map when N  == map_get(network, I0),
+                                            PK == map_get(pubkey, I0) ->
+                    if TS >= OldestTS ->
+                            Result = maps:remove(ts, Map),
+                            ?LOG_DEBUG("Cached eureka info: ~p", [Result]),
+                            {ok, Result};
+                       true ->
+                            {error, outdated}
+                    end;
+                Other ->
+                    {error, {invalid_cache_term, Other}}
+            catch
+                error:E ->
+                    {error, {invalid_cache_data, E}}
+            end;
+        {error, _} = Err ->
+            Err
+    end.
+
+cache_good_address(#{host := _,
+                     port := _,
+                     pool_id := _} = I0) ->
+    CacheInfo = cache_info(I0),
+    CacheF = cache_filename(CacheInfo),
+    
+    ToCache = CacheInfo#{ts => erlang:system_time(seconds)},
+    case filelib:ensure_dir(CacheF) of
+        ok ->
+            case file:write_file(CacheF, term_to_binary(ToCache)) of
+                ok ->
+                    {ok, ToCache};
+                {error, _} = Err ->
+                    ?LOG_DEBUG("Couldn't cache eureka in ~p: ~p", [CacheF, Err]),
+                    Err
+            end;
+        {error, _} = Err ->
+            ?LOG_ERROR("Cannot save cached info to ~s", [CacheF]),
+            Err
+    end.
+
+invalidate_cache() ->
+    CacheF = cache_filename(),
+    case file:delete(CacheF) of
+        ok ->
+            ?LOG_DEBUG("Eureka cache file removed (~p)", [CacheF]),
+            ok;
+        {error, _} = Err ->
+            ?LOG_DEBUG("Couldn't remove Eureka cache (~p): ~p", [CacheF, Err]),
+            Err
+    end.
+
+cache_info(#{ host := Addr
+            , port := Port
+            , pool_id := PoolId }) ->
+    I0 = cache_info(),
+    I0#{ host => unicode:characters_to_binary(Addr)
+       , port => Port
+       , pool_id => unicode:characters_to_binary(PoolId)}.
+
+cache_info() ->
+    Pubkey = gmhc_config:get_config([<<"pubkey">>]),
+    Network = gmhc_config:get_config([<<"network">>]),
+    #{ pubkey => Pubkey
+     , network => Network }.
+
+cache_filename() ->
+    cache_filename(cache_info()).
+
+cache_filename(#{network := Network, pubkey := Pubkey}) ->
+    Path = filename:join(cache_dir(), Network),
+    <<"ak_", PKShort:8/binary, _/binary>> = Pubkey,
+    filename:join(Path, "gmhc_eureka." ++ binary_to_list(PKShort) ++ ".cache").
+
+cache_dir() ->
+    case gmconfig:find_config([<<"cache_dir">>]) of
+        {ok, D} ->
+            D;
+        undefined ->
+            case setup_zomp:is_zomp_context() of
+                true ->
+                    cache_dir_zomp();
+                false ->
+                    filename:join(setup:data_dir(), "gmhive.cache")
+            end
+    end.
+
+cache_dir_zomp() ->
+    #{package_id := {Realm, App, _}} = zx_daemon:meta(),
+    filename:join(zx_lib:ppath(var, {Realm, App}), "gmhive.cache").
+
+get_pool_address_() ->
     case gmconfig:find_config([<<"pool_admin">>, <<"url">>], [user_config]) of
         {ok, URL0} ->
             case expand_url(URL0) of
                 <<"local">> ->
-                    #{<<"address">> => <<"127.0.0.1">>,
+                    {ok, #{host    => <<"127.0.0.1">>,
-                      <<"port">>    => gmconfig:get_config(
+                           port    => gmconfig:get_config(
                                         [<<"pool">>, <<"port">>], [schema_default]),
-                      <<"pool_id">> => gmhc_config:get_config([<<"pool">>, <<"id">>]) };
+                           pool_id => gmhc_config:get_config([<<"pool">>, <<"id">>]) }};
                 URL ->
                     ?LOG_INFO("Trying to connect to ~p", [URL]),
                     connect1(URL)
@@ -49,9 +165,13 @@ connect1(URL0) ->
             Error
     end.
 
-get_host_port(Data) ->
+get_host_port(#{ <<"address">> := Addr
+               , <<"port">>    := Port
+               , <<"pool_id">> := PoolId } = Data) ->
     ?LOG_DEBUG("Data = ~p", [Data]),
-    maps:with([<<"address">>, <<"port">>, <<"pool_id">>], Data).
+    {ok, #{ host => Addr
+          , port => Port
+          , pool_id => PoolId }}.
 
 request(get, URL) ->
     case request(get, URL, []) of

src/gmhc_events.erl

@@ -1,5 +1,5 @@
 -module(gmhc_events).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -export([subscribe/1,
          ensure_subscribed/1,

src/gmhc_handler.erl

@@ -1,5 +1,5 @@
 -module(gmhc_handler).
--vsn("0.6.1").
+-vsn("0.8.3").
 -behavior(gen_server).
 
 -export([ start_link/0
@@ -28,7 +28,7 @@
 
 -record(st, {pools = [], opts = #{}}).
 
--define(CALL_TIMEOUT, 5000).
+-define(CALL_TIMEOUT, 10_000).
 
 -include_lib("kernel/include/logger.hrl").
 

src/gmhc_lib.erl

@@ -0,0 +1,9 @@
+-module(gmhc_lib).
+-vsn("0.8.3").
+
+-export([ rand/1 ]).
+
+
+rand(Range) ->
+    <<Rx:32>> = crypto:strong_rand_bytes(4),
+    Range - (Rx rem Range).

src/gmhc_server.erl

@@ -1,5 +1,5 @@
 -module(gmhc_server).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -behaviour(gen_server).
 
@@ -92,7 +92,9 @@ handle_call({connected, Id, Type}, {Pid,_}, #st{connected = Conn} = S) ->
              monitor ->
                  stop_workers(S1#st.workers),   % shouldn't be any running
                  S1#st{workers = [], working = false};
-             worker  -> S1#st{working = true}
+             worker  ->
+                 gmhc_watchdog:watch(5*60_000, 1),    %% 5 minutes, one-shot
+                 S1#st{working = true}
          end,
     {reply, ok, S2};
 handle_call(_Req, _From, S) ->
@@ -126,6 +128,7 @@ handle_cast({from_pool, #{via := Connector,
 handle_cast({disconnected, Id}, #st{connected = Conn} = S) ->
     ?LOG_DEBUG("disconnected: ~p", [Id]),
     Conn1 = maps:remove(Id, Conn),
+    gmhc_watchdog:unwatch(),
     S1 = if map_size(Conn1) == 0 ->
                  Ws = stop_workers(S#st.workers),
                  S#st{connected = Conn1, workers = Ws};
@@ -162,16 +165,11 @@ handle_info({'EXIT', Pid, Reason}, #st{ workers = Workers
             {noreply, S}
     end;
 handle_info({timeout, _, check_workers}, #st{workers = Workers} = S) ->
-    case [W || #worker{cand = undefined} = W <- Workers] of
-        [] ->
-            {noreply, S};
-        Idle ->
     S1 = maybe_request_nonces(S),
     S2 = lists:foldl(fun(W, Sx) ->
                              maybe_restart_worker(W, Sx)
-                             end, S1, Idle),
+                     end, S1, Workers),
-            {noreply, S2}
+    {noreply, S2};
-    end;
 handle_info(Msg, St) ->
     ?LOG_DEBUG("Unknown msg: ~p", [Msg]),
     {noreply, St}.
@@ -216,7 +214,6 @@ maybe_request_nonces(#st{ candidate = #{via := Via, seq := Seq, nonces := Nonces
                         , nonces = N} = S) when ?CONNECTED(S) ->
     case Nonces == [] of
         true ->
-            %% ?LOG_DEBUG("Request more nonces, Seq = ~p, N = ~p", [Seq, N]),
             Res = gmhc_handler:call(#{via => Via,
                                        get_nonces => #{ seq => Seq
                                                       , n   => N }}),
@@ -230,7 +227,7 @@ maybe_request_nonces(S) ->
 nonces_result(#{nonces := #{seq := Seq, nonces := Nonces}}, Seq0, S) ->
     case Seq == Seq0 of
         true ->
-            %% ?LOG_DEBUG("Got nonces = ~p", [Nonces]),
+            wd_ping(),
             #st{candidate = Cand} = S,
             S#st{candidate = Cand#{nonces => Nonces}};
         false ->
@@ -240,10 +237,21 @@ nonces_result(#{nonces := #{seq := Seq, nonces := Nonces}}, Seq0, S) ->
 nonces_result({error, Reason}, Seq0, S) ->
     ?LOG_DEBUG("Got error on nonce request: ~p", [Reason]),
     Workers = stop_workers_for_seq(Seq0, S#st.workers),
+    case Reason of
+        {timeout, _} ->
+            Timeout = retry_timeout(1000, 3000),
+            erlang:start_timer(Timeout, self(), check_workers);
+        _ ->
+            ok
+    end,
     S#st{workers = Workers}.
 
+retry_timeout(Floor, Range) ->
+    Floor + gmhc_lib:rand(Range).
+
 handle_worker_result({worker_result, Result}, W, S) ->
     %% ?LOG_DEBUG("worker result: ~p", [Result]),
+    wd_ping(),
     case Result of
         {solutions, Solutions} ->
             {Cont, S1} = report_solutions_(Solutions, W, S),
@@ -435,3 +443,6 @@ worker_result(Pid, Result) ->
 decode_candidate_hash(#{candidate := C} = Cand) ->
     {ok, Hash} = gmser_api_encoder:safe_decode(bytearray, C),
     Cand#{candidate := Hash}.
+
+wd_ping() ->
+    gmhc_watchdog:ping().

src/gmhc_sup.erl

@@ -1,6 +1,6 @@
 %% -*- mode: erlang; erlang-indent-level: 4; indent-tabs-mode: nil -*-
 -module(gmhc_sup).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -behaviour(supervisor).
 
@@ -15,12 +15,13 @@ start_link() ->
     supervisor:start_link({local, ?MODULE}, ?MODULE, []).
 
 init([]) ->
-    ChildSpecs = [ worker(gmhc_server)
+    ChildSpecs = [ worker(gmhc_watchdog)
+                 , worker(gmhc_server)
                  , worker(gmhc_handler)
                  , supervisor(gmhc_connectors_sup) ],
-    SupFlags = #{ strategy      => one_for_one
+    SupFlags = #{ strategy      => rest_for_one
-                , intensity     => 1
+                , intensity     => 5             %% We really want the hive client to sort itself out
-                , period        => 5
+                , period        => 5*60          %% Timemout issues can happen infrequently
                 , auto_shutdown => never },
     {ok, {SupFlags, ChildSpecs}}.
 

src/gmhc_watchdog.erl

@@ -0,0 +1,167 @@
+-module(gmhc_watchdog).
+-behavior(gen_server).
+
+-export([ watch/2
+        , unwatch/0
+        , ping/0 ]).
+
+-export([ note_started/2
+        , remove_restart_info/1
+        , get_restart_info/0 ]).
+
+-export([ start_link/0
+        , init/1
+        , handle_call/3
+        , handle_cast/2
+        , handle_info/2
+        , terminate/2
+        , code_change/3 ]).
+
+-record(st, {services = #{}}).
+-record(svc, { n = 5           :: pos_integer()
+             , n0 = 5          :: pos_integer()
+             , interval = 5000 :: pos_integer()
+             , tref            :: reference()
+             , mref            :: reference()
+             }).
+
+-include_lib("kernel/include/logger.hrl").
+
+watch(Interval, N) ->
+    gen_server:call(?MODULE, {watch, self(), Interval, N}).
+
+unwatch() ->
+    gen_server:cast(?MODULE, {unwatch, self()}).
+
+ping() ->
+    gen_server:cast(?MODULE, {ping, self()}).
+
+note_started(Id, Info) ->
+    gen_server:call(?MODULE, {note_started, Id, Info}).
+
+get_restart_info() ->
+    gen_server:call(?MODULE, get_restart_info).
+
+remove_restart_info([]) ->
+    ok;
+remove_restart_info(IDs) ->
+    gen_server:call(?MODULE, {remove_restart_info, IDs}).
+
+start_link() ->
+    gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
+
+init([]) ->
+    {ok, #st{}}.
+
+handle_call({note_started, Id, Info}, _From, S) ->
+    update_pt(Id, Info),
+    {reply, ok, S};
+handle_call({remove_restart_info, IDs}, _From, S) ->
+    remove_restart_info_(IDs),
+    {reply, ok, S};
+handle_call(get_restart_info, _From, S) ->
+    {reply, get_pt(), S};
+handle_call({watch, Pid, Interval, N}, _From, S) ->
+    {reply, ok, add_watch(Pid, Interval, N, S)};
+handle_call(_Req, _From, S) ->
+    {reply, {error, unknown_method}, S}.
+
+handle_cast({ping, Pid}, S) ->
+    {noreply, reset_watch(Pid, S)};
+handle_cast({unwatch, Pid}, S) ->
+    {noreply, delete_watch(Pid, S)};
+handle_cast(Msg, S) ->
+    ?LOG_DEBUG("Unknown cast: ~p", [Msg]),
+    {noreply, S}.
+
+handle_info({timeout, TRef, Pid}, S) ->
+    ?LOG_INFO("Timeout for pid ~p", [Pid]),
+    {noreply, ping_timeout(Pid, TRef, S)};
+handle_info({'DOWN', _, process, Pid, _}, S) ->
+    {noreply, delete_watch(Pid, S)};
+handle_info(Msg, S) ->
+    ?LOG_DEBUG("Unknown msg: ~p", [Msg]),
+    {noreply, S}.
+
+terminate(_, _) ->
+    ok.
+
+code_change(_FromVsn, S, _Extra) ->
+    {ok, S}.
+
+add_watch(Pid, Interval, N, #st{services = Svcs} = S) ->
+    MRef = erlang:monitor(process, Pid),
+    Svc0 = #svc{ interval = Interval
+               , mref     = MRef
+               , n        = N
+               , n0       = N},
+    Svc = start_timer(Pid, Svc0),
+    S#st{services = Svcs#{Pid => Svc}}.
+
+reset_watch(Pid, #st{services = Svcs} = S) ->
+    case maps:find(Pid, Svcs) of
+        {ok, #svc{ n0 = N0 } = Svc} ->
+            Svc1 = restart_timer(Pid, Svc#svc{n = N0}),
+            S#st{services = Svcs#{Pid := Svc1}};
+        error ->
+            S
+    end.
+
+delete_watch(Pid, #st{services = Svcs} = S) ->
+    case maps:find(Pid, Svcs) of
+        {ok, #svc{tref = TRef, mref = MRef}} ->
+            erlang:cancel_timer(TRef),
+            erlang:demonitor(MRef),
+            S#st{services = maps:remove(Pid, Svcs)};
+        error ->
+            S
+    end.
+
+ping_timeout(Pid, TRef, #st{services = Svcs} = S) ->
+    case maps:find(Pid, Svcs) of
+        {ok, #svc{ n = N, tref = TRef} = Svc} ->
+            N1 = N-1,
+            if N1 =< 0 ->
+                    ?LOG_ERROR("Will exit Pid ~p", [Pid]),
+                    exit(Pid, kill),
+                    S#st{services = maps:remove(Pid, Svcs)};
+               true ->
+                    Svc1 = restart_timer(Pid, Svc#svc{n = N1}),
+                    S#st{services = Svcs#{Pid := Svc1}}
+            end;
+        {ok, _} ->
+            ?LOG_DEBUG("Timeout didn't match TRef - ignoring", []),
+            S;
+        _ ->
+            S
+    end.
+
+start_timer(Pid, #svc{interval = T} = Svc) ->
+    TRef = erlang:start_timer(T, self(), Pid),
+    Svc#svc{tref = TRef}.
+
+restart_timer(Pid, #svc{tref = TRef} = Svc) ->
+    erlang:cancel_timer(TRef),
+    start_timer(Pid, Svc#svc{tref = undefined}).
+
+update_pt(Id, Info) ->
+    Pt = get_pt(),
+    put_pt(Pt#{Id => Info}).
+
+remove_restart_info_(IDs) ->
+    RI = get_pt(),
+    case maps:without(IDs, RI) of
+        RI ->
+            ok;
+        NewRI ->
+            put_pt(NewRI)
+    end.
+
+get_pt() ->
+    persistent_term:get(pt_key(), #{}).
+
+put_pt(Pt) ->
+    persistent_term:put(pt_key(), Pt).
+
+pt_key() ->
+    {?MODULE, restart_info}.

src/gmhc_workers.erl

@@ -8,7 +8,7 @@
 %%%-------------------------------------------------------------------
 
 -module(gmhc_workers).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -export([
           get_worker_configs/0

src/gmhive_client.erl

@@ -1,5 +1,5 @@
 -module(gmhive_client).
--vsn("0.6.1").
+-vsn("0.8.3").
 
 -export([ connect/1
         , disconnect/1

zomp.meta

@@ -4,13 +4,13 @@
 {prefix,"gmhc"}.
 {author,"Ulf Wiger, QPQ AG"}.
 {desc,"Gajumaru Hive Client"}.
-{package_id,{"uwiger","gmhive_client",{0,6,1}}}.
+{package_id,{"uwiger","gmhive_client",{0,10,0}}}.
-{deps,[{"uwiger","gmhive_worker",{0,5,1}},
+{deps,[{"uwiger","gmhive_protocol",{0,3,1}},
+       {"uwiger","gmhive_worker",{0,5,1}},
        {"uwiger","gmcuckoo",{1,2,4}},
        {"otpr","eblake2",{1,0,1}},
        {"otpr","base58",{0,1,1}},
        {"otpr","gmserialization",{0,1,3}},
-       {"uwiger","gmhive_protocol",{0,1,1}},
        {"uwiger","setup",{2,2,4}},
        {"uwiger","gproc",{1,0,1}},
        {"uwiger","gmconfig",{0,1,2}},

zompify.sh

@@ -38,5 +38,12 @@ rm "$IGNORE_TEMP"
 cp "$PWD/zomp.meta" "$DST/"
 cp "$PWD/Emakefile" "$DST/"
 
+# copy generated schema
+SCHEMA="$SRC/priv/gmhc_schema.json"
+if [ -e "$SCHEMA" ]; then
+    mkdir -p "$DST/priv"
+    cp -a "$SCHEMA" "$DST/priv/$(basename "$SCHEMA")"
+fi
+
 # Clean up beam files just in case
 [ -d "$DST/ebin" ] && find "$DST/ebin" -name '*.beam' -exec rm -f {} + || true