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POThrift: Python Server, Erlang Client Errors... {thrift_socket_server,244,{child_error,function_clause,[]}}
 

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    <p>This is actually my first question on stackoverflow, but I've been having a problem that I can't really seem to solve. I'm making a Python server that calls an erlang client through thrift. The only function I've made in thrift is one called bar, which takes in an integer and prints bar (integer). Heres the Python Client, its not too complicated:</p> <pre><code>#!/usr/bin/env python import sys sys.path.append('../gen-py') from foo import Foo from foo.ttypes import * from foo.constants import * from thrift import Thrift from thrift.transport import TSocket from thrift.transport import TTransport from thrift.protocol import TBinaryProtocol try: # Make socket transport = TSocket.TSocket('localhost', 9999) # Buffering is critical. Raw sockets are very slow transport = TTransport.TBufferedTransport(transport) # Wrap in a protocol protocol = TBinaryProtocol.TBinaryProtocol(transport) # Create a client to use the protocol encoder client = Foo.Client(protocol) # Connect! transport.open() msg = client.bar(1452) print msg transport.close() except Thrift.TException, tx: print "%s" % (tx.message) </code></pre> <p>Here is my thrift client, which is listening on port 9999:</p> <pre><code>-module(foo_service). -include("foo_thrift.hrl"). -include("foo_types.hrl"). -export([start_link/0, stop/1, handle_function/2, % Thrift implementations % FILL IN HERE bar/1]). %%%%% EXTERNAL INTERFACE %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% start_link() -&gt; thrift_socket_server:start ([{port, get_port()}, {name, ?MODULE}, {service, foo_thrift}, {handler, ?MODULE}, {framed, true}, {socket_opts, [{recv_timeout, 60*60*1000}]}]). stop(_Server) -&gt; thrift_socket_server:stop (?MODULE), ok. %%%%% THRIFT INTERFACE %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% handle_function(Function, Args) when is_atom(Function), is_tuple(Args) -&gt; case apply(?MODULE, Function, tuple_to_list(Args)) of ok -&gt; ok; Reply -&gt; {reply, Reply} end. %%%%% HELPER FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% get_port() -&gt; {ok, Result} = application:get_env(foo, service_port), Result. %% ADD THRIFT FUNCTIONS HERE bar(I) -&gt; io:format("bar (~p)~n", [I]). </code></pre> <p>So I start up the thrift client, and from the python server I call client.bar(1452), and unfortunately get a child error:</p> <pre><code>=CRASH REPORT==== 5-Jul-2013::08:34:32 === crasher: initial call: thrift_socket_server:acceptor_loop/1 pid: &lt;0.51.0&gt; registered_name: [] exception error: no function clause matching thrift_socket_transport:read({data,#Port&lt;0.1067&gt;,3600000}, -2147418111) (src/thrift_socket_transport.erl, line 53) in function thrift_transport:read/2 (src/thrift_transport.erl, line 67) in call from thrift_framed_transport:read/2 (src/thrift_framed_transport.erl, line 79) in call from thrift_transport:read/2 (src/thrift_transport.erl, line 67) in call from thrift_binary_protocol:read_data/2 (src/thrift_binary_protocol.erl, line 315) in call from thrift_binary_protocol:read/2 (src/thrift_binary_protocol.erl, line 286) in call from thrift_binary_protocol:read/2 (src/thrift_binary_protocol.erl, line 175) in call from thrift_protocol:read_specific/2 (src/thrift_protocol.erl, line 186) ancestors: [foo_service,foo_sup,&lt;0.46.0&gt;] messages: [] links: [&lt;0.48.0&gt;,#Port&lt;0.1067&gt;] dictionary: [] trap_exit: false status: running heap_size: 987 stack_size: 27 reductions: 513 neighbours: =ERROR REPORT==== 5-Jul-2013::08:34:32 === {thrift_socket_server,244,{child_error,function_clause,[]}} </code></pre> <p>Any Ideas? Thanks for any help!</p>
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    1. COA recommendation: Keep the hell away from thrift. If you must have encoding, the protocol buffers client in Erlang is much better. The thrift client is a study in how not to write one :)
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    2. COI'm curious as to what you would change with the Erlang Thrift client/server? One thing that thrift provides which protocol buffers do not is the RPC layer of services, and functions on those services. We've used it for years to talk Erlang to Java and Java to Erlang in very high volume services (hundreds of thousands to millions of requests per second) without much issue.
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