mesh-controller/internal/catalogue/delivery_seat.go

package catalogue

// The delivery's owner (novox/hq ADR 0239, to-be 47): one holder for the mesh, the module mesh-delivery,
// which owns a delivery — one commit in one repository, from its pull request's head to every machine —
// and a delivery group, and asks the controller for every act. A seat of the mesh's own, so the role has
// one name whoever holds it, and the controller can tell whether anything holds it: while nothing does,
// the controller starts every walk itself, as it did before there was a delivery to own.

// DeliverySeat is the seat mesh-delivery holds.
const DeliverySeat = "mesh-delivery"

// deliveryVerbs are the delivery seat's tools: five that read, and the acts of a person and of healer H2.
func deliveryVerbs() []Verb {
	return []Verb{
		{Name: "deliveries", Description: "Every delivery not final, and those that ended in the last day, one line " +
			"each: its id (owner/repository@commit), its state, its group, what it waits for and since when. Narrowed " +
			"by state, repository or group.",
			Input: schema(map[string]string{"state": "one state, e.g. delivering or held",
				"repository": "owner/repository", "group": "a group's id (its branch name)",
				"all": "\"true\": the final ones of the last thirty days too"}, nil, "all")},
		{Name: "show", Description: "One delivery or group whole: its delivery plan (what it builds, what each " +
			"machine receives, what is not an ordinary send), every transition with when and why, the machine " +
			"steps of its walk, its group and its order.",
			Input: schema(map[string]string{"id": "a delivery's id, or a group's"}, []string{"id"})},
		{Name: "groups", Description: "Every delivery group: its members in order, why each pair is ordered " +
			"(declared, built by, version skew, engine before controller, by name), its composed check and its " +
			"state, derived from its members.",
			Input: schema(map[string]string{"all": "\"true\": the groups that ended too"}, nil, "all")},
		{Name: "what-if", Description: "The delivery plan a change would have, asked of the controller's planner " +
			"and kept nowhere: the modules it moves and their dependents in tiers, what each machine would receive, " +
			"the steps that are not an ordinary send.",
			Input: schema(map[string]string{"repository": "owner/repository",
				"paths": "the files it changes, comma-separated, from the repository's root",
				"base":  "the branch it merges into (default main)"}, []string{"repository", "paths"})},
		{Name: "table", Description: "The state table every delivery runs by: each transition with its guard, " +
			"each state's bound and what healer H2 may do once it has passed; and the machine steps' table.",
			Input: schema(map[string]string{}, nil)},
		{Name: "stalled", Description: "Every delivery held past its state's bound, with the transition the table " +
			"lets healer H2 take for it, or none.",
			Input: schema(map[string]string{}, nil)},
		{Name: "recheck", Description: "Check a rejected or ready delivery again: it goes back to proposed and the " +
			"controller is asked for its check. With why.",
			Input: schema(map[string]string{"id": "the delivery's id", "why": "why, kept with the transition"},
				[]string{"id", "why"})},
		{Name: "release", Description: "A person's word that a held delivery goes on: it starts delivering. With why.",
			Input: schema(map[string]string{"id": "the delivery's id", "why": "why, kept with the transition"},
				[]string{"id", "why"})},
		{Name: "stop", Description: "Stop a delivery that is not final, with why; its walk is ended through the " +
			"controller, and in a group every member after it is stopped too, naming it.",
			Input: schema(map[string]string{"id": "the delivery's id", "why": "why, kept with the transition"},
				[]string{"id", "why"})},
		{Name: "close", Description: "Healer H2's verb: take the one transition the table names for a delivery held " +
			"past its bound. Refused for any other.",
			Input: schema(map[string]string{"id": "the delivery's id", "why": "the condition it answers"},
				[]string{"id", "why"})},
	}
}

// SeatSays is whether a consumed `<seat>.<event>` names one of the seat's own events: the seat emits it,
// exactly or by one of its patterns (`log.*`). A consumed name whose emitter is a seat and whose event the
// seat does not emit is the event of the module of that name (novox/hq ADR 0239): mesh-delivery is a seat
// and the module holding it, and what the module says it says as itself, through the runtime that launches
// it — read as the seat's, a consumer would subscribe a subject nothing may publish.
func SeatSays(emits []string, event string) bool {
	for _, e := range emits {
		if e == event || topicMatches(e, event) {
			return true
		}
	}
	return false
}

// topicMatches is whether an event's name matches a declared pattern, `*` one dot-separated segment and
// `>` or `**` the rest.
func topicMatches(pattern, event string) bool {
	p, e := splitDots(pattern), splitDots(event)
	for i, part := range p {
		if part == ">" || part == "**" {
			return len(e) > i
		}
		if i >= len(e) || (part != "*" && part != e[i]) {
			return false
		}
	}
	return len(p) == len(e)
}

func splitDots(s string) []string {
	var out []string
	start := 0
	for i := 0; i < len(s); i++ {
		if s[i] == '.' {
			out = append(out, s[start:i])
			start = i + 1
		}
	}
	return append(out, s[start:])
}