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[leon at scarlet-intern...]

Hi,

I wanted to try out the mod_erlang_event module. I have Erlang R12B5
compiled and it's in the same location as the Makefile specifies (/usr/
local/lib/erlang/...), but running make in the src/mod/event_handlers/
mod_erlang_event goes wrong:

Compiling handle_msg.c...
cc1: warnings being treated as errors
handle_msg.c: In function 'handle_msg_sendmsg':
handle_msg.c:429: warning: the address of 'uuid' will always evaluate
as 'true'
handle_msg.c: In function 'handle_msg_handlecall':
handle_msg.c:541: warning: the address of 'uuid_str' will always
evaluate as 'true'
make[1]: *** [handle_msg.o] Error 1
make: *** [all] Error 1

At line 429 in handle_msg.c it says:

if (!switch_strlen_zero(uuid) && (session =
switch_core_session_locate(uuid))) {

(at line 541 is the same problem)

Is this a bug ? I tried removing the first part "!
switch_strlen_zero(uuid) &&" after which it compiles fine, but since I
don't fully understand what's going on, I'm sure this is not the
solution.. Also, after this, FS goes haywire after loading the module
and spews out these messages continuously:

2009-02-20 14:15:48 [ERR] mod_erlang_event.c:1417
mod_erlang_event_runtime() Failed to start empd manually
2009-02-20 14:15:48 [DEBUG] mod_erlang_event.c:1401
mod_erlang_event_runtime() Socket up listening on 127.0.0.1:8031
2009-02-20 14:15:48 [WARNING] mod_erlang_event.c:1415
mod_erlang_event_runtime() Failed to publish port to empd, trying to
start empd manually
2009-02-20 14:15:48 [ERR] mod_erlang_event.c:1417
mod_erlang_event_runtime() Failed to start empd manually
2009-02-20 14:15:48 [DEBUG] mod_erlang_event.c:1401
mod_erlang_event_runtime() Socket up listening on 127.0.0.1:8031
2009-02-20 14:15:48 [WARNING] mod_erlang_event.c:1415
mod_erlang_event_runtime() Failed to publish port to empd, trying to
start empd manually
etc..

Can someone help me and point out what's wrong ?

thanks & kind regards,

Leon de Rooij


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[andrew at hijacked.us]

On Fri, Feb 20, 2009 at 05:19:25PM +0100, Leon de Rooij wrote:

[leon at scarlet-intern...]

Hi Andrew,

Thanks! it compiles fine now.. Also thanks for the tip about empd, got
it running without errors now

regards,

Leon


On Feb 20, 2009, at 8:08 PM, Andrew Thompson wrote:

[leon at scarlet-intern...]

Hi Andrew,

Thanks for your help so far, I hope you can help me a bit further as I
don't get any reply from the FS erlang node, or so it seems.. Here is
what I've done:

- The erlang_event.conf.xml is unchanged:

<configuration name="erlang_event.conf" description="Erlang Socket
Client">
<settings>
<param name="listen-ip" value="127.0.0.1"/>
<param name="listen-port" value="8031"/>
<param name="nodename" value="freeswitch"/>
<param name="cookie" value="ClueCon"/>
<param name="shortname" value="true"/>
<param name="encoding" value="string"/>
</settings>
</configuration>

- mod_erlang_event is not loaded in FS.

- First I start "epmd -d -d"

epmd: Sat Feb 21 13:12:56 2009: epmd running - daemon = 0
epmd: Sat Feb 21 13:12:56 2009: try to initiate listening port 4369
epmd: Sat Feb 21 13:12:56 2009: starting
epmd: Sat Feb 21 13:12:56 2009: entering the main select() loop

- After that I "load mod_erlang_event" in FS:

2009-02-21 13:13:36 [DEBUG] mod_erlang_event.c:1324
mod_erlang_event_load() sections 16
2009-02-21 13:13:36 [CONSOLE] switch_loadable_module.c:858
switch_loadable_module_load_file() Successfully Loaded
[mod_erlang_event]
2009-02-21 13:13:36 [NOTICE] switch_loadable_module.c:240
switch_loadable_module_process() Adding Application 'erlang'
2009-02-21 13:13:36 [NOTICE] switch_loadable_module.c:260
switch_loadable_module_process() Adding API Function 'erlang'
2009-02-21 13:13:36 [DEBUG] mod_erlang_event.c:1401
mod_erlang_event_runtime() Socket up listening on 127.0.0.1:8031
2009-02-21 13:13:36 [DEBUG] mod_erlang_event.c:1426
mod_erlang_event_runtime() Connected and published erlang cnode at
freeswitch@erlyfs

- For which epmd gives the following output:

epmd: Sat Feb 21 13:13:36 2009: opening connection on file descriptor 4
epmd: Sat Feb 21 13:13:36 2009: got 25 bytes
***** 00000000 00 17 78 1f 5f 68 00 00 05 00 01 00 0a 66 72 65
|..x._h.......fre|
***** 00000010 65 73 77 69 74 63 68 00 00 |
eswitch..|
epmd: Sat Feb 21 13:13:36 2009: ** got ALIVE2_REQ
epmd: Sat Feb 21 13:13:36 2009: registering 'freeswitch:1', port 8031
epmd: Sat Feb 21 13:13:36 2009: type 104 proto 0 highvsn 5 lowvsn 1
epmd: Sat Feb 21 13:13:36 2009: got 4 bytes
***** 00000000 79 00 00 01 |y...|
epmd: Sat Feb 21 13:13:36 2009: ** sent ALIVE2_RESP for "freeswitch"

- Then I start an erl shell on that same machine with "erl -sname ldr -
setcookie ClueCon". Output of epmd:

epmd: Sat Feb 21 13:16:24 2009: opening connection on file descriptor 5
epmd: Sat Feb 21 13:16:24 2009: got 18 bytes
***** 00000000 00 10 78 8e 2c 4d 00 00 05 00 05 00 03 6c 64 72
|..x.,M.......ldr|
***** 00000010 00 00 |..|
epmd: Sat Feb 21 13:16:24 2009: ** got ALIVE2_REQ
epmd: Sat Feb 21 13:16:24 2009: registering 'ldr:1', port 36396
epmd: Sat Feb 21 13:16:24 2009: type 77 proto 0 highvsn 5 lowvsn 5
epmd: Sat Feb 21 13:16:24 2009: got 4 bytes
***** 00000000 79 00 00 01 |y...|
epmd: Sat Feb 21 13:16:24 2009: ** sent ALIVE2_RESP for "ldr"

As far as I understand the freeswitch@erlyfs node cannot be seen with
nodes() ? So does that mean that I also cannot net_adm:ping() it ?

Anyway, I tried sending some tuples as is shown on the wiki, but I get
no reply:

(ldr@erlyfs)1> {foo, freeswitch@erlyfs} ! {api, status, ""}, receive X
-> X after 1000 -> timeout end.
timeout
(ldr@erlyfs)2>

- Epmd gives some logs:

epmd: Sat Feb 21 13:19:09 2009: opening connection on file descriptor 6
epmd: Sat Feb 21 13:19:09 2009: got 13 bytes
***** 00000000 00 0b 7a 66 72 65 65 73 77 69 74 63 68
|..zfreeswitch|
epmd: Sat Feb 21 13:19:09 2009: ** got PORT2_REQ
epmd: Sat Feb 21 13:19:09 2009: got 23 bytes
***** 00000000 77 00 1f 5f 68 00 00 05 00 01 00 0a 66 72 65 65 |
w.._h.......free|
***** 00000010 73 77 69 74 63 68 00 |
switch.|
epmd: Sat Feb 21 13:19:09 2009: ** sent PORT2_RESP (ok) for "freeswitch"
epmd: Sat Feb 21 13:19:09 2009: closing connection on file descriptor 6

- And in tcpdump on lo, I see that epmd is contacted after which some
traffic was sent to FS:

13:19:09.535293 IP 172.31.0.13.34678 > 172.31.0.13.4369: S
2875169966:2875169966(0) win 32792 <mss 16396,sackOK,timestamp
17946545 0,nop,wscale 6>
...
13:19:09.536834 IP 172.31.0.13.4369 > 172.31.0.13.34678: . ack 15 win
512 <nop,nop,timestamp 17946546 17946546>
13:19:09.536923 IP 172.31.0.13.47054 > 172.31.0.13.8031: S
2868322908:2868322908(0) win 32792 <mss 16396,sackOK,timestamp
17946546 0,nop,wscale 6>
13:19:09.536935 IP 172.31.0.13.8031 > 172.31.0.13.47054: R 0:0(0) ack
2868322909 win 0

Shouldn't FS then send a message back to the process in my erl shell ?

I tried logging all events in fs_cli, by entering "/event plain all",
but I see no events at all coming from erlang, just some heartbeats..

Also, I recompiled the module with EI_DEBUG defined as suggested on
the wiki. Still I don't see anything in the CLI when set to debug
logging.

Thanks again,

Leon


On Feb 20, 2009, at 8:08 PM, Andrew Thompson wrote:

[andrew at hijacked.us]

On Sat, Feb 21, 2009 at 03:42:24PM +0100, Leon de Rooij wrote:

[andrew at hijacked.us]

Leon,

I can't replicate your issue, at the very least I'd expect you to see
the "Ignorable error in ei_accept - probable bad client version, bad
cookie or bad nodename" warning. What OS/Erlang version are you using?

Andrew

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[leon at scarlet-intern...]

Hi Andrew,

Everything is running on an Ubuntu Hardy Xen domu with kernel
2.6.24-23-xen.

Erlang is version R12B5 and was compiled from source with options --
enable-hipe, --enable-smp-support en --enable-threads.

FS is trunk version 12197.

I did copy the configuration file to ~freeswitch/conf/autoload_configs

Also, I just checked the 'empd -names', after both FS and an erl shell
have been started:

root@erlyfs:~# epmd -names
epmd: up and running on port 4369 with data:
name ldr at port 57114
name freeswitch at port 8031

So that should be fine..

I also tried loading mod_erlang_event from modules.conf, and
starting FS as root, but - not surprisingly - that didn't make any
difference.

I've been looking in wireshark, what exactly is going over the line,
and the strange thing is, that erl opens a TCP connection, a SYN
packet is sent to FS, after which FS immediately returns an RST/ACK
packet and thus closes the connection.. I still don't see anything in
the FS CLI.

Is there anything I can do to get more verbose output from FS - esp
info about why the connection was closed ?

thanks,

Leon

On Feb 23, 2009, at 1:12 AM, Andrew Thompson wrote:

[andrew at hijacked.us]

On Mon, Feb 23, 2009 at 11:09:28AM +0100, Leon de Rooij wrote:

[andrew at hijacked.us]

Leon,

I think I found the problem. I shouldn't have been defaulting to binding
to 127.0.0.1, instead the default should be 0.0.0.0. I've patched the
module to actually bind to 0.0.0.0 correctly and made it the default in
the config file. Erlang nodes by default bind to 0.0.0.0, so I decided
to make mod_erlang_event follow suit.

Please give that a shot and see if it fixes things.

Andrew

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[leon at scarlet-intern...]

Andrew,

I think you're right, packets are indeed sent to 172.31.0.13 while
mod_erlang_event is listening at 127.0.0.1 ! Why didn't I see that !

Will test it now and let you know how it goes..

regards,

Leon

On Feb 24, 2009, at 1:22 AM, Andrew Thompson wrote:

[leon at scarlet-intern...]

Well, this works, I feel a bit stupid now :-] Now it's time to play
with it..

Thanks a lot !

kind regards,

Leon


On Feb 24, 2009, at 1:22 AM, Andrew Thompson wrote:

[andrew at hijacked.us]

On Tue, Feb 24, 2009 at 10:49:24AM +0100, Leon de Rooij wrote: