# mesh-healers

Holds the seat `mesh-healers` (novox/hq ADR 0564 §7, §8): the mesh's healers, moved out of the controller. Go, one
binary (`cmd/mesh-healers`), served by a runtime of its own on its own bus account (`runs-as`).

## What it does

It hears the condition keeper's `condition-raised` and `condition-changed` (seat `mesh-conditions`) on a durable
consumer. A condition whose kind a healer answers is acted on within the healer's budget, its settle and the mesh-wide
brake (twelve acts an hour). A repair is a call of the seat or tool that owns the act. No healer acts here today: H3
(a lost consumer) and H4 (a consumer far behind) ended with the controller (issue 1126), since nobody raises their kinds
any more; the grants part makes a missing account consumer itself and raises `mesh-grants.consumer-behind` of its own.
H5 (the provider's own repair) is registered and runs in the provider.

Each act is begun by a create of its key in `attempts` before it is made and finished after, so a holder that dies
mid-act has spent it and a second instance cannot begin it again. The condition keeper writes the condition's
`tried`, resolver and escalation from `attempts`; a healer writes no condition.

**They act, and no lease turns it** (issue 1126): the controller ended by its unassignment. While it ran, each act a
healer would take was written to `would`, never to `attempts`; nothing writes `would` any more.

Each key of `attempts` and `would` lives a week from its last write, its own time to live (the buckets are declared
`key-ttl`): nothing else deletes `would`. The healers' waits
are keys of `wakes` whose time to live is the wait: `settle.<condition key>` ends with a settle and judges the condition
again, `fortnight` ends when S15's oldest counted act leaves the fortnight and counts again. The watch of `wakes` hears
each expiry; no timer runs in the process. A wait still running is on the bus across a restart; one that expired while
no instance watched is judged at the start.

S15: it hears the seat mesh-hand-acts' `act-recorded` and watches the controller's hand-act log and writes `healer-wanted` for a cause repaired by hand twice within a
fortnight; a drill and a person's decision by design never count.

## What it keeps

- `mesh-healers_attempts`: every act and escalation, each key kept a week.
- `mesh-healers_would`: the newest act it would take per healer and condition while the controller ran, each key
  kept a week; nothing writes it any more.
- `mesh-healers_findings`: the brake, its own blindness, and S15.
- `mesh-healers_wakes`: the waits, each key living as long as it waits.

## Its verbs and tools

- `mesh-healers.healers`: the registry, the acts of the last days, the would-acts, the brake, whether it acts and why;
  `recount=true` counts the hand-act log again.
- `mesh-healers.heal`: one act now on an open condition, by key and why.
- `mesh-healers.drill`: records a drill in the hand-act log of the seat `mesh-hand-acts` as `hand-act drill`; with
  no holder of that seat it is refused. S15 never counts a drill.
- `healers_findings`, `healers_would`, `healers_wakes`: the reads of its buckets.