riakc_pb_socket错误：start_link（）使用rebar3和Erlang

Question

我使用cowboy rest http处理程序创建了一个erlang应用程序。应用程序将数据存储在riv kv中。但是我无法连接到我的riak节点来为其余api返回数据。

当我打电话给riakc_pb_socket：start_link（“127.0.0.1”，8087）时，出现错误。

以下是我打电话给riak的代码片段。

get_json(Req, State) -> 
    {ok, Pid} = riakc_pb_socket:start_link("127.0.0.1", 8087), 
    Body = riakc_pb_socket:is_connected(Pid), 
    {Body, Req, State}. 

以下是发生错误时的堆栈跟踪。

=ERROR REPORT==== 28-Dec-2016::00:15:52 === 
    Error in process <0.359.0> on node 'paddylenderapi@PaddyLender-2' with 
    exit value: 
    {[{reason,undef}, 
    {mfa,{paddylenderapi_rest_handler,get_json,2}}, 
    {stacktrace, 
    [{riakc_pb_socket,start_link,["127.0.0.1",8087],[]}, 
    {paddylenderapi_rest_handler,get_json,2, 
     [{file, 
      "/home/oladipo/Projects/Erlang/PaddyLender/paddylenderapi 
    /_build/prod/lib/paddylenderapi/src/paddylenderapi_rest_handler.erl"}, 
     {line,37}]}, 
    {cowboy_rest,call,3, 
     [{file, 
      "/home/oladipo/Projects/Erlang/PaddyLender/paddylenderapi 
    /_build/default/lib/cowboy/src/cowboy_rest.erl"}, 
     {line,972}]}, 
    {cowboy_rest,set_resp_body,2, 
     [{file, 
      "/home/oladipo/Projects/Erlang/PaddyLender/paddylenderapi 
    /_build/default/lib/cowboy/src/cowboy_rest.erl"}, 
     {line,854}]}, 
    {cowboy_protocol,execute,4, 
     [{file, 
      "/home/oladipo/Projects/Erlang/PaddyLender/paddylenderapi 
    /_build/default/lib/cowboy/src/cowboy_protocol.erl"}, 
     {line,442}]}]}, 

见下面我rebar.config内容：

{erl_opts, [debug_info]}. 
     {deps, [ 
     {cowboy, {git, "git://github.com/ninenines/cowboy.git", {tag, "1.0.1"}}}, 
     {riakc, "2.5.*", {git, "https://github.com/basho/riak-erlang-client", {tag, "2.5.1"}}}, 
     {riak_pb, {git, "https://github.com/basho/riak_pb", {tag, "2.1.4.2"}}} 
    ] 
    }. 

    {plugins, [ 
     rebar3_run 
    ] 
}. 


{relx, [ 
     {release, {paddylenderapi, "0.0.1"},[paddylenderapi]}, 
     {dev_mode, true}, 
     {include_erts, false}, 
     {extended_start_script, true} 
    ] 
}. 

{overrides, 
[ 
    {override, rebar3_protobuffs_plugin, [{deps, [ {protobuffs, {git, "https://github.com/basho/erlang_protobuffs.git", {tag, "0.9.0"}}}]}]}, 

    {override, riak_pb, [ 
         {plugins, [{riak_pb_msgcodegen, 
            {git, "https://github.com/tsloughter/riak_pb_msgcodegen.git", 
            {ref, "dc51330"}}}, 
            {rebar3_protobuffs_plugin, 
            {git, "https://github.com/cmkarlsson/rebar3_protobuffs_plugin", 
            {tag, "0.1.1"}}}]}, 
         {provider_hooks, [{pre, [{compile, {protobuffs, compile}}, 
               {compile, riak_pb_msgcodegen}]}]}]} 
    ] 
}. 

Answer 1

我建议你不要在 '应用程序' 在您的paddylenderapi.app.src部分riak_kv。这就是为什么这个应用程序不在发布lib文件夹中的原因。所以你得到了undef错误。