CDRIVER-2875 spawning and logging

- add bypass_cooldown for single threaded clients

Author: kevinAlbs

src/libmongoc/doc/mongoc_auto_encryption_opts_set_extra.rst

@@ -19,6 +19,15 @@ Parameters
 * ``opts``: The :symbol:`mongoc_auto_encryption_opts_t`
 * ``extra``: A :symbol:`bson_t` of additional options.
 
+``extra`` is a :symbol:`bson_t` containing any of the following optional fields:
+
+* ``mongocryptdURI`` set to a URI to connect to the mongocryptd process (default is "mongodb://localhost:27027").
+* ``mongocryptdBypassSpawn`` set to true to prevent the driver from spawning the mongocryptd process (default behavior is to spawn).
+* ``mongocryptdSpawnPath`` set to a path (with trailing slash) to search for mongocryptd (defaults to empty string and uses default system paths).
+* ``mongocryptdSpawnArgs`` set to an array of string arguments to pass to ``mongocryptd`` when spawning (defaults to ``[ "--idleShutdownTimeoutSecs=60" ]``).
+
+For more information, see the `Client-Side Encryption specification <https://github.com/mongodb/specifications/blob/master/source/client-side-encryption/client-side-encryption.rst#extraoptions>`_.
+
 See also
 --------
 

src/libmongoc/src/mongoc/mongoc-client-side-encryption-private.h

@@ -46,4 +46,9 @@ _mongoc_cse_enable_auto_encryption (
    mongoc_auto_encryption_opts_t *opts /* may be NULL */,
    bson_error_t *error);
 
+bool
+_mongoc_fle_spawn_mongocryptd (const char *mongocryptd_spawn_path,
+                               const bson_iter_t *mongocryptd_spawn_args,
+                               bson_error_t *error);
+
 #endif /* MONGOC_CLIENT_SIDE_ENCRYPTION_PRIVATE_H */