mongoc_topology_description_has_writable_server()

bool
mongoc_topology_description_has_writable_server (mongoc_topology_description_t *td);

Determines if the topology has a writable server available, such as a primary, mongos, or standalone. This function uses the driver's current knowledge of the state of the MongoDB server or servers it is connected to; it does no I/O and it does not block.

True if there is a known writable server.

Introduction to Application Performance Monitoring