28 Jun
2017
28 Jun
'17
9:39 a.m.
### Description
I have a json string stored in a variable, and I want to iterate over the values in it.
This works if there are integer values in the json string. But if it consists only of
string values, jansson_get throws an error.
According to jsonlint, all my json strings are valid.
### Troubleshooting
#### Reproduction
This is the part of kamailio.cfg leading to the error:
```
# Integer json array
$var(myIntList) = '[2,3,4,5]';
xlog("L_INFO", "Integer json string is >>>> $var(myIntList)
<<<<");
jansson_get('[0]', $var(myIntList), "$var(intValue)");
xlog("L_INFO", "First Int Element: >> $var(intValue)
<<");
jansson_get('[1]', $var(myIntList), "$var(intValue)");
xlog("L_INFO", "Second Int Element: >> $var(intValue)
<<");
# String json array
$var(myStringList) = '["foo", "bar", "baz"]';
xlog("L_INFO", "String json string is >>>> $var(myStringList)
<<<<");
jansson_get('[0]', $var(myStrList), "$var(strValue)");
xlog("L_INFO", "First Str Element: >> $var(strValue)
<<");
jansson_get('[1]', $var(myStrList), "$var(strValue)");
xlog("L_INFO", "Second Str Element: >> $var(strValue)
<<");
# Mixed json array
$var(myMixedList) = '[2, "bar"]';
xlog("L_INFO", "Mixed json string (int first) is >>>>
$var(myMixedList) <<<<");
jansson_get('[0]', $var(myMixedList), "$var(mixedValue)");
xlog("L_INFO", "First Mixed Element: >> $var(mixedValue)
<<");
jansson_get('[1]', $var(myMixedList), "$var(mixedValue)");
xlog("L_INFO", "Second Mixed Element: >> $var(mixedValue)
<<");
$var(myMixedList) = '["bar", 2]';
xlog("L_INFO", "Mixed json string (string first) is >>>>
$var(myMixedList) <<<<");
jansson_get('[0]', $var(myMixedList), "$var(mixedValue)");
xlog("L_INFO", "First Mixed Element: >> $var(mixedValue)
<<");
jansson_get('[1]', $var(myMixedList), "$var(mixedValue)");
xlog("L_INFO", "Second Mixed Element: >> $var(mixedValue)
<<");
```
#### Log Messages
This is the output generated by the above kamailio.cfg snippet.
```
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: Integer json string
is >>>> [2,3,4,5] <<<<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: First Int Element:
>> 2 <<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: Second Int Element:
>> 3 <<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: String json string
is >>>> ["foo", "bar", "baz"] <<<<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: ERROR: jansson [jansson_funcs.c:59]:
janssonmod_get(): failed to parse: 0
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: ERROR: jansson [jansson_funcs.c:61]:
janssonmod_get(): json error at line 1: '[' or '{' expected near
'0'
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: First Str Element:
>> 0 <<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: ERROR: jansson [jansson_funcs.c:59]:
janssonmod_get(): failed to parse: 0
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: ERROR: jansson [jansson_funcs.c:61]:
janssonmod_get(): json error at line 1: '[' or '{' expected near
'0'
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: Second Str Element:
>> 0 <<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: Mixed json string
(int first) is >>>> [2, "bar"] <<<<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: First Mixed
Element: >> 2 <<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: Second Mixed
Element: >> bar <<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: Mixed json string
(string first) is >>>> ["bar", 2] <<<<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: First Mixed
Element: >> bar <<
Jun 28 15:31:12 busch /usr/sbin/kamailio[29961]: INFO: <script>: Second Mixed
Element: >> 2 <<
```
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.0.2 (x86_64/linux)
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST,
DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC,
DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER,
USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024,
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 4.9.2
```
* **Operating System**:
Debian Jessie
```
Linux busch.domain 3.16.0-4-amd64 #1 SMP Debian 3.16.39-1+deb8u1 (2017-02-22) x86_64
GNU/Linux
```
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