Mongo change streams - #2884
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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
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Hey @s-ludwig! This builds on the sessions/transactions PR and adds change stream support to the MongoDB driver.
It introduces watch() at all three levels — on the client (a change stream over the whole deployment), on a database (all its collections), and on a single collection. The returned ChangeStream is an input range that tracks resume tokens and automatically resumes on transient or resumable server errors. As usual for change streams, it needs a replica set or a sharded cluster.
It's stacked on mongo-sessions-and-transactions, so please review that one first; the diff here is just the change-stream feature (one new module, the three watch() methods, and an integration test).
Builds clean and all unit tests pass.
Closes #2860
Merge after #2883
Thanks for taking a look!