Network specific cache filename + more sanity checks

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

ebin/gmhive_client.app

@@ -1,6 +1,6 @@
 {application,gmhive_client,
              [{description,"Gajumaru Hive Client"},
-              {vsn,"0.8.0"},
+              {vsn,"0.8.1"},
               {registered,[]},
               {applications,[kernel,stdlib,sasl,gproc,inets,ssl,enoise,
                              gmconfig,gmhive_protocol,gmhive_worker]},

src/gmhc_eureka.erl

@@ -16,7 +16,8 @@ get_pool_address() ->
     end.
 
 cached_address() ->
-    CacheF = cache_filename(),
+    I0 = cache_info(),
+    CacheF = cache_filename(I0),
     ?LOG_DEBUG("Eureka cache filename: ~p", [CacheF]),
     case file:read_file(CacheF) of
         {ok, Bin} ->
@@ -24,9 +25,12 @@ cached_address() ->
             OldestTS = NowTS - 24*60*60,
             try binary_to_term(Bin) of
                 #{ ts      := TS
+                 , network := N
+                 , pubkey  := PK
                  , host    := _
                  , port    := _
-                 , pool_id := _} = Map ->
+                 , 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]),
@@ -44,14 +48,15 @@ cached_address() ->
             Err
     end.
 
-cache_good_address(#{host := Addr,
+cache_good_address(#{host := _,
-                     port := Port,
+                     port := _,
-                     pool_id := PoolId}) ->
+                     pool_id := _} = I0) ->
-    CacheF = cache_filename(),
+    CacheInfo = cache_info(I0),
-    ToCache = #{ host => unicode:characters_to_binary(Addr)
+    CacheF = cache_filename(CacheInfo),
-               , port => Port
+    
-               , pool_id => unicode:characters_to_binary(PoolId)
+    ToCache = CacheInfo#{ts => erlang:system_time(seconds)},
-               , ts => erlang:system_time(seconds)},
+    case filelib:ensure_dir(CacheF) of
+        ok ->
             case file:write_file(CacheF, term_to_binary(ToCache)) of
                 ok ->
                     ?LOG_DEBUG("Cached eureka info in: ~p", [CacheF]),
@@ -59,6 +64,10 @@ cache_good_address(#{host := Addr,
                 {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() ->
@@ -72,9 +81,27 @@ invalidate_cache() ->
             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() ->
-    <<"ak_", PKShort:8/binary, _/binary>> = gmhc_config:get_config([<<"pubkey">>]),
+    cache_filename(cache_info()).
-    filename:join(setup:data_dir(), "gmhc_eureka." ++ binary_to_list(PKShort) ++ ".cache").
+
+cache_filename(#{network := Network, pubkey := Pubkey}) ->
+    Path = filename:join(setup:data_dir(), Network),
+    <<"ak_", PKShort:8/binary, _/binary>> = Pubkey,
+    filename:join(Path, "gmhc_eureka." ++ binary_to_list(PKShort) ++ ".cache").
 
 get_pool_address_() ->
     case gmconfig:find_config([<<"pool_admin">>, <<"url">>], [user_config]) of

zomp.meta

@@ -4,7 +4,7 @@
 {prefix,"gmhc"}.
 {desc,"Gajumaru Hive Client"}.
 {author,"Ulf Wiger, QPQ AG"}.
-{package_id,{"uwiger","gmhive_client",{0,8,0}}}.
+{package_id,{"uwiger","gmhive_client",{0,8,1}}}.
 {deps,[{"uwiger","gmhive_protocol",{0,2,0}},
        {"uwiger","gmhive_worker",{0,5,1}},
        {"uwiger","gmcuckoo",{1,2,4}},