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@sarcio/server-hmr

v0.2.0

Published

22 days ago

Applies approved Sarcio code fixes to a running Node.js service, with canary rollout and rollback.

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@sarcio/server-hmr

Applies an approved Sarcio code fix to a running Node.js service without a restart, and lets a tester try the fix on their own traffic before everyone else gets it.

Setup guides and the full reference are in the Sarcio docs.

Install

npm install @sarcio/server-hmr

startStickyCluster({ workers, port }) runs your service as a cluster in which a tester's requests (marked by the sarcio_canary cookie or the x-sarcio-canary header) go to one dedicated worker, and everyone else stays on the others.
handle.seedCanary(payloads) gives the fix to that tester only; handle.rollout(payloads) gives it to every worker; handle.rollback(ids) puts the original code back.
attachSarcioWorker(server, registry) and createNodeRegistry() are the worker side.

The integrity of every fix is checked before it is applied, and again in each worker.

License

Business Source License 1.1: production use to connect your own applications to a Sarcio subscription or trial is granted; offering a competing service is not. Each version converts to Apache-2.0 four years after its release.