We also supply a C ESL lib that handles the encoding and also solves potential race conditions on the socket. On Wed, Oct 28, 2015 at 8:48 AM, Martyn Davies <martyn@magiccow.co.uk> wrote:
Andrew,
I just wanted to to add that I used an open library called JSMN ('jasmine') to decode JSON messages in a "C" application. This wasn't at all painful to use with the Freeswitch JSON-formatted events. This is another way of solving the problem.
Regards, Martyn
On 26 October 2015 at 21:37, Andrew Keil <andrew.keil@visytel.com> wrote:
Nathan,
Thanks for your response. I have since implemented a simple parser that converts any %xx to the ASCII character (which you are correct with my aim to simply make it more readable). I have tested this and it works fine. So if, in a future FreeSWITCH version, no %xx characters are used inside the values it will just work anyway.
I take your point about the newline character.
Andrew
-----Original Message----- From: freeswitch-users-bounces@lists.freeswitch.org [mailto: freeswitch-users-bounces@lists.freeswitch.org] On Behalf Of Nathan Neulinger Sent: Monday, 26 October 2015 2:16 PM To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org> Subject: Re: [Freeswitch-users] Re- Hex values inside ESL "plain" event messages?
A plain message couldn't safely (for parsing purposes) include all of the characters that would be completely valid in json.
Take a newline for example. That would simply encode to \n in the text of a json message, but would completely screw up the plain format one.
As for the selection of which characters get encoded, that I don't have any info on. Below I see colons and spaces inconsistently encoded. While probably not critical, it seems like a relatively safe choice.
Simple matter - since the plain message can't possibly cover the entire character set - you have to support decoding, at which point, it shouldn't matter which ones are encoded for anything other than human readability.
-- Nathan
On 10/25/2015 05:24 PM, Andrew Keil wrote:
To FreeSWITCH users,
I just wanted to check if there is a reason why hex values are included inside the ESL "plain" event messages, since when I use JSON event messages they are correctly converted to the correct ASCII character. I would prefer to use the plain messages since it is quicker for my back-end in "C" to work with, however obviously I need to switch the hex characters back to ASCII (which is easy I know), however I wondered if this is just a historic thing kept in or whether it should be changed to output the ASCII values?
Any feedback will be of interest.
For example (HEARTBEAT) from a simple TELNET session to FreeSWITCH:
event plain HEARTBEAT
Content-Type: command/reply
Reply-Text: +OK event listener enabled plain
Content-Length: 901
Content-Type: text/event-plain
Event-Name: HEARTBEAT
Core-UUID: 92575721-6081-4b86-baed-c44e3bf0f3c8
FreeSWITCH-Hostname: visytel-laptop
FreeSWITCH-Switchname: visytel-laptop
FreeSWITCH-IPv4: 192.168.15.13
FreeSWITCH-IPv6: 2001%3A0%3A5ef5%3A79fd%3A2cd4%3A4228%3A876a%3Aad51
Event-Date-Local: 2015-10-26%2009%3A09%3A44
Event-Date-GMT: Sun,%2025%20Oct%202015%2022%3A09%3A44%20GMT
Event-Date-Timestamp: 1445810984231200
Event-Calling-File: switch_core.c
Event-Calling-Function: send_heartbeat
Event-Calling-Line-Number: 70
Event-Sequence: 512
Event-Info: System%20Ready
Up-Time: 0%20years,%200%20days,%200%20hours,%201%20minute,%200%20seconds,%2019% 20milliseconds,%20180%20microseconds
FreeSWITCH-Version: 1.5.15b~64bit
Uptime-msec: 60019
Session-Count: 0
Max-Sessions: 1000
Session-Per-Sec: 30
Session-Per-Sec-Max: 0
Session-Per-Sec-FiveMin: 0
Session-Since-Startup: 0
Session-Peak-Max: 0
Session-Peak-FiveMin: 0
Idle-CPU: 99.583980
Regards,
Andrew Keil
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-- ------------------------------------------------------------ Nathan Neulinger nneul@mst.edu Missouri S&T Information Technology (573) 612-1412 System Administrator - Architect
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