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#### Description
If the query failed, the result set should not be parsed and used. This results in an
empty result set which will most likely lead to unwanted behavior.
Background: While troubleshooting, we detected that domain.reload actually replaces
domains with an empty result set if mongodb connectivity fails.
```
DEBUG: db_mongodb [mongodb_dbase.c:849]: db_mongodb_store_result(): An error occurred: No
suitable servers found (`serverSelectionTryOnce` set): [connection timeout calling
ismaster on 'pdb-iop1-wrmg-2:27017'] [connection timeout calling ismaster
on 'pdb-iop1-wrmg-1:27017']
DEBUG: domain [domain.c:365]: reload_tables(): number of rows in domain_attrs table: 0
DEBUG: <core> [db_res.c:79]: db_free_columns(): freeing 0 columns
DEBUG: <core> [db_res.c:138]: db_free_result(): freeing result set at
0x7fb0c9811848
DEBUG: db_mongodb [mongodb_dbase.c:973]: db_mongodb_query(): query to collection
[domains]
DEBUG: db_mongodb [mongodb_dbase.c:1007]: db_mongodb_query(): query filter: { }
DEBUG: db_mongodb [mongodb_dbase.c:1043]: db_mongodb_query(): columns filter: {
"projection" : { "domain" : 1, "did"
: 1 } }
```
You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/3996
-- Commit Summary --
* mongodb: fix cursor error resulting empty result set
-- File Changes --
M src/modules/db_mongodb/mongodb_dbase.c (1)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/3996.patch
https://github.com/kamailio/kamailio/pull/3996.diff
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