Mongo load balanced - #2890
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…nitoring, primary write-routing Reworks the MongoDB driver onto a Server Discovery and Monitoring (SDAM) foundation: single-pass topology discovery, background health monitoring, writes routed to the primary, per-query read preferences, and read-preference tag server selection. Adds the wire/codec and topology infrastructure (serverdescription, monitor, wire, wireversion, compression, commands, clustertime) and reworks connection/client/collection/database/cursor onto it. Base of a stacked series: client sessions, multi-document transactions and retryable writes follow in the next PR, and the self-contained MongoDB 8 features (change streams, client bulkWrite, GridFS, CSFLE, Stable API, mongodb+srv, load-balancer mode) as PRs on top of that. Closes vibe-d#2845, vibe-d#2847, vibe-d#2848, vibe-d#2849, vibe-d#2851
…writes Adds client session support (logical session ids backed by a server session pool), multi-document transactions (start/commit/abort), and retryable writes — including write retry when the primary steps down — on top of the SDAM core. Stacked on mongo-driver-core-improvements. Closes vibe-d#2850, vibe-d#2854, vibe-d#2855, vibe-d#2856
Adds change streams via watch() on MongoClient (whole deployment), MongoDatabase (all collections), and MongoCollection. The returned ChangeStream input range tracks resume tokens and automatically resumes on transient/resumable errors; requires a replica set or sharded cluster. Stacked on mongo-sessions-and-transactions. Closes vibe-d#2860
Adds MongoClient.bulkWrite() — the MongoDB 8.0 server-level bulkWrite command spanning multiple collections and databases in a single request. Builds the command, drains the result cursor via getMore (killing it on a mid-drain failure), and parses the summary plus per-operation verbose results; honours ordered/verboseResults/writeConcern and surfaces partial results on error. Stacked on mongo-change-streams. Closes vibe-d#2861
Adds GridFS support via GridFSBucket for storing and retrieving large files as chunked documents: upload/download, chunk split and assembly, and the files/chunks collection bookkeeping with their indexes. Stacked on mongo-client-bulkwrite. Closes vibe-d#2862 Merge after vibe-d#2861
Adds the CSFLE configuration and data model: AutoEncryptionOptions, ClientEncryption with a key-vault integration, a MongoCryptProvider seam, KeyVault for managing data encryption keys, and EncryptOptions/DataKeyOptions — plus a MongoClientSettings.autoEncryption field to opt in. Stacked on mongo-gridfs. Closes vibe-d#2863 Merge after vibe-d#2862
Adds MongoDB Stable API support: a serverApi configuration (apiVersion / apiStrict / apiDeprecationErrors) parsed from the connection string into MongoClientSettings.serverApi and applied to every command — including the handshake hello — by the connection. Stacked on mongo-csfle. Closes vibe-d#2858 Merge after vibe-d#2863
Adds load-balancer mode (loadBalanced=true): the driver fixes the topology to the single configured host without SDAM probing, advertises loadBalanced in the handshake, enforces the server-provided serviceId, and infers MONGODB-X509 auth from a client-cert-without-password configuration. Stacked on mongo-stable-api. Closes vibe-d#2864 Merge after vibe-d#2858
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Hey @s-ludwig! This builds on the Stable API PR and adds load-balancer mode for connecting through a MongoDB load balancer (e.g. Atlas Serverless / mongos behind an LB).
When loadBalanced=true, the driver fixes the topology to the single configured host without running SDAM discovery, advertises loadBalanced: true in the connection handshake, and enforces the server-provided serviceId. It also infers MONGODB-X509 authentication from a client-certificate-without-password configuration.
It's stacked on mongo-stable-api; the diff here is just the load-balancer feature (the settings field + validation, the handshake/serviceId/X509 hooks in the connection, the fixed-topology path in the client, and an integration test).
Builds clean and all unit tests pass.
Closes #2864
Merge after #2858