jschoubben
4d94b0b9e4
A watch of the node-engine's manifest-reads-changed subscribed the flat subject, which no engine says, so its consumer would hear nothing. mesh-sdk is pinned by a local replace to the group's head while developing. Claude-Session: https://claude.ai/code/session_01JG73KG7AfSdh6FP8VrBqCn
85 lines
4.7 KiB
Go
85 lines
4.7 KiB
Go
package buscompose
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import (
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"git.novox.be/novox/mesh-sdk/go/asks"
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"git.novox.be/novox/mesh-sdk/go/catalogue"
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"git.novox.be/novox/mesh-sdk/go/delivery"
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"git.novox.be/novox/mesh-sdk/go/provisions"
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)
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// The node seat node-engine (novox/hq ADR 0563 §1): every node's engine holds it on its own bus account, and no module
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// claims it. Its verbs and events are the catalogue's (catalogue.EngineVerbs), read here rather than copied.
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// EngineSeat is the seat.
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const EngineSeat = catalogue.EngineSeat
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// EngineModule is the node-engine's manifest's module name, and EngineActsState its state the acts asked through the
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// node seat and its own asks are kept in (ADR 0563 §2, §3: "the engine's own state"): the bucket mesh-host_acts, keys
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// `<node>.act.<id>`, `<node>.open.<act>.<digest>` and `<node>.ask.<id>`, each written by that node's engine alone.
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const (
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EngineModule = "mesh-host"
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EngineActsState = "acts"
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)
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// EngineActsBucket is that state's bucket.
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var EngineActsBucket = BucketName(EngineModule, EngineActsState)
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// EnginePackagesBucket is the engine's state of its node's declared packages (novox/hq ADR 0565 clause 6): one key, the
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// node's name, written by that node's engine alone.
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var EnginePackagesBucket = BucketName(EngineModule, delivery.EnginePackagesState)
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// EngineDataBucket is the engine's state of its node's placed modules' data items (novox/hq ADR 0577 clause 1): one
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// key `<node>.<module>` per module, written by that node's engine alone.
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var EngineDataBucket = delivery.EngineDataBucket
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// EnginePackagesGrants is what a node's engine publishes to keep its node's key of the packages bucket: the key alone,
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// and its read.
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func EnginePackagesGrants(node string) []string {
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return append([]string{"$KV." + EnginePackagesBucket + "." + node}, readGrants(EnginePackagesBucket, node)...)
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}
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// engineGrants is what a node's engine is granted to hold its node seat and to ask the operator (ADR 0563 §1, §3): it
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// answers its own node's verbs (the caller-named subjects are added beside them with every principal's), says the
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// seat's events about its node, answers discovery for the seat, asks who answers what (the login shell's execute, ADR
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// 0563 §6), and asks the operator under asks.EngineAsker(node) on the router's seat as its holder declares it, as any
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// user of that seat is granted.
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//
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// Its verbs and events are granted as any verb and any event of the seat on its own node, not as the contract's list:
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// the list is compiled into whichever mesh-sdk the grants part pins, so a verb the engine gained before the grants part
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// was released was refused on every node and the engine reopened its link every few minutes (2026-10-31, the optional
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// verb composition of mesh-host #184). As a module answers `mesh.mod.<module>.tool.>`, nothing is given away: no other
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// principal may subscribe this seat's subjects of this node, and a caller is still granted each verb by name.
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func engineGrants(p Principal) (pub, sub []string) {
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sub = append(sub, "mesh.seat."+EngineSeat+".tool.*."+p.Node)
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// Any event of the seat about its own node, by the one rule a watcher of it is composed by (machineEvent).
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every, _ := machineEvent(Seat{Name: EngineSeat, Scope: "node", HeldByTheEngine: true}, "*")
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pub = append(pub, seatSubject(Seat{Name: EngineSeat}, "event", onMachine(every, p.Node)))
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sub = append(sub, announcing(EngineSeat)...)
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pub = append(pub, discovering()...)
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tp, ts := seatTrafficGrants(SeatTrafficOf(asks.EngineAsker(p.Node), nil, p.Uses, nil))
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// And its acts and asks, under its own node's keys alone; never the bucket's creation, which is the grants part's.
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if own, err := NodeKeysGrants(EngineActsBucket, p.Node); err == nil {
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pub = append(pub, own...)
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}
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// And the provisions its node's modules consume, its own node's keys alone, read (novox/hq ADR 0570 clause 6: the
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// consuming engine checks the vault's name and generation of what it is handed).
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if safeSubject.MatchString(p.Node) {
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pub = append(pub, readGrants(provisions.ProvisionsBucket, p.Node+".>")...)
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}
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// And its node's own health report, its key `<node>` alone (issue 774, the operator's alert table): what the watchman
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// reads for the machine's alerts.
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if safeSubject.MatchString(p.Node) {
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pub = append(pub, append([]string{"$KV." + delivery.NodeHealthBucket + "." + p.Node},
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readGrants(delivery.NodeHealthBucket, p.Node)...)...)
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}
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// And its node's placed modules' data items, its own node's keys alone (ADR 0577 clause 1).
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if own, err := NodeKeysGrants(EngineDataBucket, p.Node); err == nil {
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pub = append(pub, own...)
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}
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// And its node's declared packages, its own key alone (ADR 0565 clause 6).
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if safeSubject.MatchString(p.Node) {
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pub = append(pub, EnginePackagesGrants(p.Node)...)
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}
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return append(pub, tp...), append(sub, ts...)
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}
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