I have a server application made in Erlang. In it I have an mnesia table that store some information on photos. In the spirit of "everything is a process" I decided to wrap that table in a gen_server module, so that the gen_server module is the only one that directly accesses the table. Querying and adding information to that table is ...
I am building an ejabberd module. I require this module to perform RPC calls to another node on the same LAN (sname). From what I understand, ejabberd configures it owns "cookie" which, of course, will differ from the cookie I use for my other nodes. Is there a way to force ejabberd to use another cookie? EDIT: ejabberd starts its dae...
I've browsed the module development documentation but I can't find an API that would help me determine if 'user' (i.e. identified through a JID) is allowed administrative access. I understand there is the module 'acl' which looks promising (or probably the answer altogether) but no public API is documented. Should I just assume that th...
Recommendations for languages with native (so no FSM generation tools) support for state machine development and execution and passing of messages/signals. This is for telecoms, e.g implementation of FSMs of this level of complexity. I have considered Erlang, but would love some feedback, suggestions, pointer to tutorials, alternatives,...
Is it possible to implement a closure in Erlang? For example, how would I translate this snippet from Scheme? (define (make-adder n) (lamdba (x) (+ x n))) I've tried the following, but I'm clearly missing something. make_adder(n) -> fun (x) -> x + n end. Compiling this gives the error Warning: this expression will fail with...
I am new to Erlang and wondering what the best open source projects are out there with good documentation. I completed reading both the books Erlang Programming (Francesco) and Programming Erlang (Joe). From what I can see ErlyWeb (Yariv's web framework) and Mochiweb seems to have good documentation. Given my basic knowledge, are there a...
Non-blocking TCP server on trapexit.org explains how to build server based on tcp_gen, but i want to modify this example and make it work with ssl. For now i have completely no idea how to replace {ok, Ref} = prim_inet:async_accept(Listen_socket, -1) ...
I'm looking for an Erlang library function that will return the index of a particular element in a list. So, if X=[10,30,50,70] then lists:index_of(30, X) would return 1, etc., just like java.util.List's indexOf() method. Does such a method exist in the Erlang standard lib? I tried looking in the lists module but no luck. Or shou...
Hi, I have a website built with PHP. I have an Erlang application running as a daemon on the same server. I need to call functions on the Erlang application from PHP and get back the result. I've found PHP/Erlang and over PHP modules but I can't install a PHP module on this server, I can only use PHP code. The only way I know to solve...
I'm using Exuberant ctags to index Erlang files. The "tags" file contains functions, but they do not have module qualifiers; so I can't search for "module:function", only "function", which may give several results. Do you know a way to get ctags to include module qualifiers in the tags file? Thanks. ...
I've parsed an HTML page with mochiweb_html and want to parse the following text fragment 0 1 Basically I want to split the string on the spaces and dash character and extract the numbers in the first characters. Now the string above is represented as the following Erlang list [48,32,226,128,147,32,49] I'm trying to split it using...
So following on from this question: http://stackoverflow.com/questions/1459152/erlang-listsindexof-function I have the following code which works just fine: -module(test_index_of). -compile(export_all). index_of(Q)-> N=length(Q), Qs=lists:zip(lists:sort(Q), lists:seq(1, N)), IndexFn=fun(X)-> {_, {_, I}}=lists...
Is there a way to query the name table that epmd daemon manages? The nodes() function isn't very helpful on that front. NOTE: I am looking for an API aside from parsing the output generated through stdout. ...
Is there a way to access UNIX domain sockets (e.g. /var/run/dbus/system_bus_socket ) directly from Erlang without resorting to a third-party driver? ...
Hi there, I made a comet chat server with Erlang and Mochiweb. And I run the "./start-dev.sh" to start the server. But after about 1 month I got the following error: =ERROR REPORT==== 26-Sep-2009::09:21:06 === {mochiweb_socket_server,235, {child_error, {badmatch, {error, [70,97,105,108,101,100,32...
Hi, Just to get it straight in my head. Consider this example bit of Erlang code: test() -> receive {From, whatever} -> %% do something test(); {From, somethingelse} -> %% do something else test(); end. Isn't the test() call, just a goto? I ask ...
I think using ets will still introduce similar side effects. ...
I am trying to use *ei_get_type()* (ei) but I am having trouble finding where the 'type' field is documented. I've looked in ei.h but all I could find was a list of constants starting with "ERL_". #define ERL_SMALL_INTEGER_EXT 'a' #define ERL_INTEGER_EXT 'b' #define ERL_FLOAT_EXT 'c' #define ERL_ATOM_EXT 'd' #defi...
Hello - I am attempting to run BeepBeep through Mochiweb on Port 80. It works if I type sudo ./start_server.sh. Are there any security risks with running Mochiweb like this? If so how to remedy? Thanks! ...
Hi I am a newbie in the Erlang world. When I think of how we need to solve the following problem (and there are a long list of similar ones), I think it's really inefficient because we are speaking of a lot of recursion. Apprently, language like C/Java would not need the clumsy recursion to solve this problem, but with Erlang (I guess ot...