mongoc_client_get_handshake_description − mongoc_client_get_handshake_description()
mongoc_server_description_t * mongoc_client_get_handshake_description (mongoc_client_t *client, uint32_t server_id, bson_t *opts, bson_error_t *error) BSON_GNUC_WARN_UNUSED_RESULT;
Returns a description constructed from the initial handshake response to a server.
mongoc_client_get_handshake_description() is distinct from mongoc_client_get_server_description(). mongoc_client_get_server_description() returns a server description constructed from monitoring, which may differ from the server description constructed from the connection handshake.
mongoc_client_get_handshake_description() will attempt to establish a connection to the server if a connection was not already established. It will perform the MongoDB handshake and authentication if required.
Use this function only for building a language driver that wraps the C Driver. When writing applications in C, higher−level functions automatically select a suitable server.
Single−threaded clients only have one active connection to each server. The one connection is used for both monitoring and application operations. However, the server description returned by mongoc_client_get_handshake_description() may still differ from the server description returned by mongoc_client_get_server_description(). Notably, if connected to a load balanced cluster, the server description returned by mongoc_client_get_server_description() will describe the load balancer server (mongoc_server_description_type() will return "LoadBalancer"). And the server description returned by mongoc_client_get_handshake_description() will describe the backing server.
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client: A mongoc_client_t. | ||
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server_id: The ID of the server. This can be obtained from the server description of mongoc_client_select_server(). | ||
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opts: Unused. Pass NULL. | ||
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error: An optional location for a bson_error_t or NULL. |
A mongoc_server_description_t that must be freed with mongoc_server_description_destroy(). If a connection has not been successfully established to a server, returns NULL and error is filled out.
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mongoc_client_select_server() To select a server from read preferences. | ||
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mongoc_client_get_server_description() To obtain the server description from monitoring for a server. | ||
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mongoc_server_description_type() To obtain the type of server from a server description. |
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