8000 Fix `kvstore_client` (update for API changes) by danielfinke · Pull Request #9 · WhatsApp/waraft · GitHub
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Fix kvstore_client (update for API changes) #9

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Fix kvstore_client (update for API changes) #9

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23 changes: 16 additions & 7 deletions examples/kvstore/src/kvstore_client.erl
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Original file line number Diff line number Diff line change
Expand Up @@ -15,32 +15,41 @@
delete/1
]).

-export_type([
read_result/0,
commit_result/0
]).

-include_lib("kernel/include/logger.hrl").

-define(CALL_TIMEOUT, 5000).
-define(TABLE, kvstore).
-define(NUM_PARTITIONS, 4).
-define(PARTITION(P), list_to_atom(lists:concat(["raft_acceptor_", ?TABLE, "_" , P]))).

-type read_result() :: {ok, term()} | not_found | wa_raft_acceptor:read_error() | wa_raft_acceptor:call_error().
-type commit_result() :: ok | wa_raft_acceptor:commit_error() | wa_raft_acceptor:call_error().

%% Read value for a given key. It's a blocking call.
-spec read(term()) -> {ok, {term(), map(), number()}} | {error, term()}.
-spec read(term()) -> read_result().
read(Key) ->
execute(Key, {read, ?TABLE, Key}).
Partition = ?PARTITION(partition(Key)),
wa_raft_acceptor:read(Partition, {read, ?TABLE, Key}, ?CALL_TIMEOUT).

%% Write a key/value pair to storage. It's a blocking call.
-spec write(term(), term()) -> {ok, number()} | {error, term()}.
-spec write(term(), term()) -> commit_result().
write(Key, Value) ->
execute(Key, {write, ?TABLE, Key, Value}).

%% Delete a key/value pair. It's a blocking call.
-spec delete(term()) -> ok | {error, term()}.
-spec delete(term()) -> commit_result().
delete(Key) ->
execute(Key, {delete, ?TABLE, Key}).

-spec execute(term(), term()) -> term().
-spec execute(term(), term()) -> commit_result().
execute(Key, Command) ->
Partition = ?PARTITION(partition(Key)),
gen_server:call(Partition, {commit, {make_ref(), Command}}, ?CALL_TIMEOUT).
Partition = ?PARTITION(partition(Key)),
wa_raft_acceptor:commit(Partition, {make_ref(), Command}, ?CALL_TIMEOUT).

-spec partition(term()) -> number().
partition(Key) ->
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