I’m pleased to announce version 1.9.0 of libbson and libmongoc, the libraries constituting the MongoDB C Driver.

libbson

It is my pleasure to announce Libbson-1.9.0.

New features and bugfixes:

• Fix Autotools syntax for OpenBSD and any platform lacking stdint.h.
• Fix Android NDK incompatibilities.
• Fix a one-byte write past the end of a buffer in bson_decimal128_to_string.
• Avoid reading past the end of a string that contains UTF-8 multibyte NIL.
• Fix some pedantic warnings in C99 mode.

libmongoc

It is my pleasure to announce mongo-c-driver 1.9.0. This version drops support for MongoDB 2.4 and adds support for MongoDB 3.6 features:

• New struct mongoc_change_stream_t to watch a collection for changes.
• New struct mongoc_client_session_t represents a MongoDB 3.6 session, which supports causal consistency: you are guaranteed to read your writes and to perform monotonic reads, even when reading from secondaries or in a sharded cluster.
• New functions that accept flexible options as a BSON document. These accept a “sessionId” option and any future options. In addition, the two new “update” functions accept the “arrayFilters” option that is new in MongoDB 3.6:
  • mongoc_collection_insert_one
  • mongoc_collection_insert_many
  • mongoc_collection_update_one
  • mongoc_collection_update_many
  • mongoc_collection_replace_one
  • mongoc_collection_delete_one
  • mongoc_collection_delete_many
  • mongoc_client_command_with_opts
  • mongoc_database_command_with_opts
  • mongoc_collection_command_with_opts
  • mongoc_client_find_databases_with_opts
  • mongoc_client_get_database_names_with_opts
  • mongoc_collection_create_bulk_operation_with_opts
  • mongoc_collection_find_indexes_with_opts
  • mongoc_database_find_collections_with_opts
  • mongoc_database_get_collection_names_with_opts
• New URI option “retryWrites=true” safely and automatically retries certain write operations if the server is a MongoDB 3.6 replica set or sharded cluster.
• Support for MongoDB OP_MSG wire protocol.

Additional changes not specific to MongoDB 3.6:

• Support for mongodb+srv URIs to query DNS for SRV and TXT records that configure the connection to MongoDB.
• Support LibreSSL with CMake build
• The “minPoolSize” URI option is deprecated: it’s confusing and not useful.

Bug fixes:

• mongoc_bulk_operation_execute did not always initialize “reply”.
• Fix C99 pedantic warnings.

Links:

• libbson-1.9.0.tar.gz
• libmongoc-1.9.0.tar.gz
• All the issues resolved in 1.9.0
• Documentation

Thanks to everyone who contributed to this release.

• A. Jesse Jiryu Davis
• Hannes Magnusson
• Jeremy Mikola
• Kevin Albertson
• Jeroen Ooms
• Iulian Rotaru
• Derick Rethans
• Graham Whitted
• Brian Moss
• Alex Masterov
• Michael Kuhn
• Sriharsha Vardhan
• Jean-Marc Le Roux
• Dimitri Gence

Peace,
A. Jesse Jiryu Davis

Image: the frigate USS Constitution, in Nouveau dictionnaire encyclopédique universel illustré, circa 1885