53 lines
2.6 KiB
Go
53 lines
2.6 KiB
Go
package broker
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// The bus account of one process of a module that declares bus (novox/hq ADR 0436 §1, §2, §3, §5).
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//
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// **Never the module's own account's grants, never the tool runner's.** A process's authority is read
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// straight from its bus declaration — its emits, its queue's consumer, its state, whether it reads the
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// records of its module's own asks, and the tools and seat verbs it calls — and nothing else: it holds no
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// seat, serves no tool, hears no module stream, and answers nothing a caller asked (§3). Modelled on
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// provisionerGrants, the other kind of process account the mesh mints (ADR 0349 clauses 6 and 11).
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// processGrants is one process's whole authority: to publish, and to subscribe.
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func processGrants(p Principal) (pub, sub []string, err error) {
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// 1. Its own events, under its module's own namespace — the same subjects the module's own principal
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// would publish them on, had it declared them there instead (novox/hq ADR 0436 §1).
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own := "mesh.mod." + p.Module
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for _, e := range p.Emits {
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pub = append(pub, own+".event."+e)
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}
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// 2. The one durable consumer of each work-queue stream its bus names (novox/hq ADR 0436 §1, §2, §6):
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// asked about, pulled from and acknowledged, by the same name ConsumersOf composes the consumer under
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// (queueConsumer) — and no other stream's.
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for _, q := range p.Queues {
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consumer := p.Node + "_" + p.Module + "_" + q.Process
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pub = append(pub,
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"$JS.API.CONSUMER.INFO."+q.Stream+"."+consumer,
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"$JS.API.CONSUMER.MSG.NEXT."+q.Stream+"."+consumer,
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"$JS.ACK."+q.Stream+"."+consumer+".>")
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}
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// 3. Its module's own state, by the local names its bus names alone — never the whole of what the
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// module keeps (novox/hq ADR 0436 §1), read and written as stateGrants gives any module's own bucket.
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pub = append(pub, stateGrants(stateAccess{Module: p.Module, Node: p.Node, Keeps: p.State})...)
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// 4. The router's records of its module's own asks (novox/hq ADR 0436 §1, ADR 0259 §3): the same
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// direct-get subjects a module's own principal reads for the seats its Uses names that keep them —
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// read here from the one list, so the two cannot disagree.
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if p.Asks {
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pub = append(pub, SeatTrafficOf(p.Module, nil, p.Uses, nil).Records...)
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}
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// 5. The tools and seat verbs it calls (novox/hq ADR 0152, ADR 0436 §1): the same derivation a
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// module's own principal's invokes takes, so `callerNamed` (applied to every non-controller principal)
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// adds the caller-named `call` variants for it exactly as it would for a module.
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invoked, err := invokedSubjects(p.Invokes)
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if err != nil {
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return nil, nil, err
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}
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pub = append(pub, invoked...)
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return pub, sub, nil
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}
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