src/hz.erl

@@ -66,6 +66,7 @@
          contract_create/8,
          prepare_contract/1,
          prepare_aaci/1,
+         cache_aaci/2,
          aaci_lookup_spec/2,
          contract_call/5,
          contract_call/6,
@@ -1073,7 +1074,7 @@ contract_create2(CreatorID, Nonce, Amount, TTL, Gas, GasPrice, Source, Options,
          InitArgs  :: [string()],
          Result    :: {ok, CreateTX} | {error, Reason},
          CreateTX  :: binary(),
-         Reason    :: file:posix() | term().
+         Reason    :: file:posix() | bad_fun_name | aaci_not_found | term().
 %% @doc
 %% This function takes the compiler output (instead of starting from source),
 %% and returns the unsigned create contract call data with default values.
@@ -2207,17 +2208,35 @@ zip_record_field({Name, Type}, {Remaining, Missing}) ->
            {missing, {Remaining, [Name | Missing]}}
     end.
 
+
+-spec cache_aaci(Label, AACI) -> ok
+    when Label :: term(),
+         AACI  :: aaci().
+%% @doc
+%% Caches an AACI for future reference in calls that would otherwise require
+%% the AACI as an argument. Once cached, a pre-built AACI can be referenced in
+%% later calls by substituting the AACI argument with `{aaci, Label}'.
+
+cache_aaci(Label, AACI) ->
+    hz_man:cache_aaci(Label, AACI).
+
+
 -spec aaci_lookup_spec(AACI, Fun) -> {ok, Type} | {error, Reason}
     when AACI   :: aaci(),
          Fun    :: binary() | string(),
          Type   :: {term(), term()}, % FIXME
-         Reason :: bad_fun_name.
+         Reason :: bad_fun_name | aaci_not_found.
 
 %% @doc
 %% Look up the type information of a given function, in the AACI provided by
 %% prepare_contract/1. This type information, particularly the return type, is
 %% useful for calling decode_bytearray/2.
 
+aaci_lookup_spec({aaci, Label}, Fun) ->
+    case hz_man:lookup_aaci(Label) of
+        {ok, AACI} -> aaci_lookup_spec(AACI, Fun);
+        error      -> {error, aaci_not_found}
+    end;
 aaci_lookup_spec({aaci, _, FunDefs, _}, Fun) ->
     case maps:find(Fun, FunDefs) of
         A = {ok, _} -> A;
@@ -2248,10 +2267,15 @@ min_gas() ->
     200000.
 
 
+encode_call_data({aaci, Label}, Fun, Args) ->
+    case hz_man:lookup_aaci(Label) of
+        {ok, AACI} -> encode_call_data(AACI, Fun, Args);
+        error      -> {error, aaci_not_found}
+    end;
 encode_call_data({aaci, _ContractName, FunDefs, _TypeDefs}, Fun, Args) ->
     case maps:find(Fun, FunDefs) of
         {ok, {ArgDef, _ResultDef}} -> encode_call_data2(ArgDef, Fun, Args);
-        error        -> {error, bad_fun_name}
+        error                      -> {error, bad_fun_name}
     end.
 
 encode_call_data2(ArgDef, Fun, Args) ->

src/hz_man.erl

@@ -20,6 +20,9 @@
          chain_nodes/0, chain_nodes/1,
          timeout/0,     timeout/1]).
 
+%% Contract caching
+-export([cache_aaci/2,  lookup_aaci/1]).
+
 %% The whole point of this module:
 -export([request_sticky/1, request_sticky/2, request/1, request/2]).
 
@@ -44,7 +47,8 @@
          chain_nodes = {[], []} :: {[hz:chain_node()], [hz:chain_node()]},
          sticky      = none     :: none | hz:chain_node(),
          fetchers    = []       :: [#fetcher{}],
-         timeout     = 5000     :: pos_integer()}).
+         timeout     = 5000     :: pos_integer(),
+         cache       = #{}      :: #{Label :: term() := AACI :: hz:aaci()}}).
 
 
 -type state()   :: #s{}.
@@ -94,6 +98,22 @@ timeout(Value) when 0 < Value, Value =< 120000 ->
     gen_server:cast(?MODULE, {timeout, Value}).
 
 
+-spec cache_aaci(Label, AACI) -> ok
+    when Label :: term(),
+         AACI  :: hz:aaci().
+
+cache_aaci(Label, AACI) ->
+    gen_server:call(?MODULE, {cache, Label, AACI}).
+
+
+-spec lookup_aaci(Label) -> Result
+    when Label  :: term(),
+         Result :: {ok, hz:aaci()} | error.
+
+lookup_aaci(Label) ->
+    gen_server:call(?MODULE, {lookup, Label}).
+
+
 -spec request_sticky(Path) -> {ok, Value} | {error, Reason}
     when Path   :: unicode:charlist(),
          Value  :: map(),
@@ -167,6 +187,12 @@ handle_call({request, Request}, From, State) ->
 handle_call({request_sticky, Request}, From, State) ->
     NewState = do_request_sticky(Request, From, State),
     {noreply, NewState};
+handle_call({lookup, Label}, _, State) ->
+    Result = do_lookup(Label, State),
+    {reply, Result, State};
+handle_call({cache, Label, AACI}, _, State) ->
+    NewState = do_cache_aaci(Label, AACI, State),
+    {reply, ok, NewState};
 handle_call(tls, _, State = #s{tls = TLS}) ->
     {reply, TLS, State};
 handle_call(chain_nodes, _, State) ->
@@ -265,6 +291,15 @@ do_tls(_, State) ->
     State.
 
 
+do_cache_aaci(Label, AACI, State = #s{cache = Cache}) ->
+    NewCache = maps:put(Label, AACI, Cache),
+    State#s{cache = NewCache}.
+
+
+do_lookup(Label, #s{cache = Cache}) ->
+    maps:find(Label, Cache).
+
+
 do_request_sticky(_, From, State = #s{sticky = none}) ->
     ok = gen_server:reply(From, {error, no_nodes}),
     State;