jschoubben
371abdaad1
A settle and the fortnight end are keys of wakes whose time to live is the wait, heard on expiry; attempts and would keep each key a week by its own time to live. Rearm stays only for a settle that expired while no instance watched. Pins mesh-sdk bc6c8a6.
46 lines
2.9 KiB
Markdown
46 lines
2.9 KiB
Markdown
# mesh-healers
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Holds the seat `mesh-healers` (novox/hq ADR 0564 §7, §8): the mesh's healers, moved out of the controller. Go, one
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binary (`cmd/mesh-healers`), served by a runtime of its own on its own bus account (`runs-as`).
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## What it does
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It hears the condition keeper's `condition-raised` and `condition-changed` (seat `mesh-conditions`) on a durable
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consumer. A condition whose kind a healer answers is acted on within the healer's budget, its settle and the mesh-wide
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brake (twelve acts an hour). A repair is a call of the seat or tool that owns the act: H3 asks the grants part's
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`grants_assert` for the module whose consumer is gone. H4 (the controller's own consumer) and H5 (the provider's own
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repair) are registered and run elsewhere.
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Each act is begun by a create of its key in `attempts` before it is made and finished after, so a holder that dies
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mid-act has spent it and a second instance cannot begin it again. The condition keeper writes the condition's
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`tried`, resolver and escalation from `attempts`; a healer writes no condition.
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**Only once the controller's lease names no controller.** Until the write that hands the lease away, each act it would
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take is written to `would`, never to `attempts`: it counts for no budget, settle or brake and reaches no condition.
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Each key of `attempts` and `would` lives a week from its last write, its own time to live (the buckets are declared
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`key-ttl`): nothing else deletes `would`, and once the lease is handed away nothing is written there. The healers' waits
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are keys of `wakes` whose time to live is the wait: `settle.<condition key>` ends with a settle and judges the condition
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again, `fortnight` ends when S15's oldest counted act leaves the fortnight and counts again. The watch of `wakes` hears
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each expiry; no timer runs in the process. A wait still running is on the bus across a restart; one that expired while
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no instance watched is judged at the start, once the lease is first read.
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S15: it watches the controller's hand-act log and writes `healer-wanted` for a cause repaired by hand twice within a
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fortnight; a drill and a person's decision by design never count.
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## What it keeps
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- `mesh-healers_attempts`: every act and escalation, each key kept a week.
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- `mesh-healers_would`: the newest act it would take per healer and condition while the controller holds the lease,
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each key kept a week.
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- `mesh-healers_findings`: the brake, its own blindness, and S15.
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- `mesh-healers_wakes`: the waits, each key living as long as it waits.
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## Its verbs and tools
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- `mesh-healers.healers`: the registry, the acts of the last days, the would-acts, the brake, whether it acts and why;
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`recount=true` counts the hand-act log again.
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- `mesh-healers.heal`: one act now on an open condition, by key and why.
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- `mesh-healers.drill`: refused until the hand-act log's home is delivered (issue 1953), naming `mesh-controller.drill`.
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- `healers_findings`, `healers_would`, `healers_wakes`: the reads of its buckets.
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