jschoubben
3ca1f5d26a
A tier whose module a later tier is built by waited for the machines running it to report after the build — and relied on the catalogue's moved event to send them. A rebuild from the same source commit is not a move the catalogue announces: the build machine rebuilt for a controller change kept its commit, nothing sent it, and the plan waited on a report that would never come (2026-10-01, 19:45Z). The plan now sends the machines running a gated module once, records when, and waits for the reports after that.
635 lines
18 KiB
Go
635 lines
18 KiB
Go
package main
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import (
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"context"
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"flag"
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"fmt"
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"sort"
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"strings"
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"time"
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"github.com/novox/mesh-controller/internal/inventory"
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"github.com/novox/mesh-controller/internal/link"
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)
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// A merge produces a tiered plan the mesh keeps (novox/hq ADR 0162).
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//
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// The handler that hears the merge computes the plan from the catalogue's one dependency relation,
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// writes it to the store, asks the first tier and returns — the receive loop is never held by a
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// build. Every outcome taken in advances the plan it belongs to; a ticker advances what outcomes
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// alone cannot (a tier waiting for machines to report); a controller replaced mid-plan finds the
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// plan where it left it.
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// planWaitBound is how long a plan may wait on one thing before `status` names it red.
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const planWaitBound = 30 * time.Minute
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// tiersOf sorts a set of modules into tiers along the ordering edges among them: tier 0 depends
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// on nothing else in the set, tier 1 only on tier 0, and so on. An edge to a module outside the set says
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// nothing about the order inside it. A cycle — which the catalogue should never produce — puts
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// what remains in one last tier rather than losing it, and is said by the caller.
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func tiersOf(set []string, edges []inventory.Edge) [][]string {
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in := map[string]bool{}
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for _, m := range set {
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in[m] = true
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}
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deps := map[string]map[string]bool{}
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for _, m := range set {
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deps[m] = map[string]bool{}
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}
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for _, e := range edges {
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// A code dependency — B packages A's source — rebuilds B with A, in the same tier: B's
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// build needs nothing of A's first. The other kinds order: stands-on and declared after
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// the base is built, built-by after the build machine is built and running — except for
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// what the build machine itself stands on. The runtime image is built by the builder and
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// the builder is built on the runtime image; the image comes first, built by the builder
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// that is running, which is the only one there could be.
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if !in[e.From] || !in[e.To] || e.From == e.To || e.Kind == inventory.EdgePackages {
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continue
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}
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if e.Kind == inventory.EdgeBuiltBy && isBaseOf(e.From, e.To, edges, in) {
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continue
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}
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deps[e.From][e.To] = true
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}
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placed := map[string]bool{}
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var tiers [][]string
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for len(placed) < len(set) {
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var tier []string
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for _, m := range set {
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if placed[m] {
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continue
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}
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free := true
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for d := range deps[m] {
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if !placed[d] {
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free = false
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break
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}
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}
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if free {
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tier = append(tier, m)
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}
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}
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if len(tier) == 0 {
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// A cycle: everything left, together, and the caller says so.
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for _, m := range set {
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if !placed[m] {
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tier = append(tier, m)
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}
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}
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}
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sort.Strings(tier)
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for _, m := range tier {
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placed[m] = true
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}
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tiers = append(tiers, tier)
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}
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return tiers
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}
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// isBaseOf says whether `to` stands on `base`, directly or through other bases in the set, along
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// the build edges alone.
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func isBaseOf(base, to string, edges []inventory.Edge, in map[string]bool) bool {
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seen := map[string]bool{}
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var walk func(string) bool
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walk = func(m string) bool {
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if m == base {
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return true
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}
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if seen[m] {
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return false
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}
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seen[m] = true
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for _, e := range edges {
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if e.From == m && in[e.To] && (e.Kind == inventory.EdgeStandsOn || e.Kind == inventory.EdgeDeclared) && walk(e.To) {
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return true
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}
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}
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return false
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}
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return walk(to)
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}
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// reachableFrom is the moved modules plus everything that depends on them, through every layer:
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// what a merge rebuilds. Along the code and build edges only: a module *built by* the build machine
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// is not changed by a new build machine, so a built-by edge orders and gates a plan and never
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// widens it — the first plan of 2026-10-01 took the whole catalogue along for a controller change.
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func reachableFrom(moved []string, edges []inventory.Edge) []string {
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in := map[string]bool{}
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for _, m := range moved {
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in[m] = true
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}
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for grew := true; grew; {
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grew = false
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for _, e := range edges {
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if e.Kind == inventory.EdgeBuiltBy {
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continue
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}
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if in[e.To] && !in[e.From] {
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in[e.From] = true
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grew = true
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}
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}
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}
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out := make([]string, 0, len(in))
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for m := range in {
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out = append(out, m)
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}
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sort.Strings(out)
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return out
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}
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// hasCycle says whether the tiers' last tier holds modules that still depend on each other.
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func hasCycle(tiers [][]string, edges []inventory.Edge) bool {
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if len(tiers) == 0 {
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return false
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}
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last := map[string]bool{}
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for _, m := range tiers[len(tiers)-1] {
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last[m] = true
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}
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for _, e := range edges {
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if last[e.From] && last[e.To] {
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return true
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}
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}
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return false
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}
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// planFor is the plan a merge produces: the moved modules and everything reachable from them,
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// tiered, with the merge it answers.
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func planOfMerge(m link.SourceMoved, moved []string, edges []inventory.Edge) inventory.Plan {
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set := reachableFrom(moved, edges)
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tiers := tiersOf(set, edges)
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modules := map[string]*inventory.PlanModule{}
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for _, name := range set {
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modules[name] = &inventory.PlanModule{}
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}
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return inventory.Plan{
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ID: fmt.Sprintf("plan-%d", time.Now().UnixNano()),
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Repository: m.Owner + "/" + m.Repo,
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Commit: m.Commit,
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Created: time.Now().UTC(),
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State: inventory.PlanBuilding,
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Tiers: tiers,
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Modules: modules,
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}
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}
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// gates is what the next tier needs running from this one: a module of the tier that a later
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// tier is built by — the runtime dependency — and whose policy rolls it out, must be applied by
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// the machines running it before the next tier is asked. A base an image stands on need only be
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// built; a source another module packages need not even be that.
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func gates(p inventory.Plan, edges []inventory.Edge, rollsOut func(string) bool) []string {
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if p.Tier >= len(p.Tiers) {
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return nil
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}
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inTier := map[string]bool{}
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all := map[string]bool{}
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for _, tier := range p.Tiers {
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for _, m := range tier {
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all[m] = true
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}
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}
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for _, m := range p.Tiers[p.Tier] {
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inTier[m] = true
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}
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later := map[string]bool{}
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for _, tier := range p.Tiers[p.Tier+1:] {
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for _, m := range tier {
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later[m] = true
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}
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}
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seen := map[string]bool{}
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var out []string
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for _, e := range edges {
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if later[e.From] && inTier[e.To] && e.Kind == inventory.EdgeBuiltBy && !seen[e.To] && rollsOut(e.To) &&
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!isBaseOf(e.From, e.To, edges, all) {
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seen[e.To] = true
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out = append(out, e.To)
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}
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}
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sort.Strings(out)
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return out
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}
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// applied says whether every machine running the module has reported since the module was built.
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func applied(module string, builtAt time.Time, running []string, reports []inventory.Reported) (bool, []string) {
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at := map[string]*time.Time{}
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for _, r := range reports {
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at[r.Node] = r.At
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}
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var waiting []string
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for _, n := range running {
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if t := at[n]; t == nil || t.Before(builtAt) {
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waiting = append(waiting, n)
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}
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}
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return len(waiting) == 0, waiting
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}
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// askTier asks the build machine for every module of the tier, and marks each asked. A module
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// the catalogue no longer holds, or whose ask could not be made, is a failure of the plan: a tier
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// half asked is a tier that will never complete.
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func askTier(ctx context.Context, inv *inventory.Inventory, p *inventory.Plan) error {
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entries, err := inv.Catalogued(ctx)
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if err != nil {
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return err
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}
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byName := map[string]inventory.Entry{}
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for _, e := range entries {
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byName[e.Manifest.Module] = e
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}
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now := time.Now().UTC()
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for _, name := range p.Tiers[p.Tier] {
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state := p.Modules[name]
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if state == nil {
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state = &inventory.PlanModule{}
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p.Modules[name] = state
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}
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e, known := byName[name]
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if !known {
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state.State = "failed"
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state.Why = "no longer in the catalogue"
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p.State = inventory.PlanFailed
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p.Note = name + " is no longer in the catalogue"
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continue
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}
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source := buildSource{Repository: e.Source.Repository, Seat: e.Source.Seat}
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fmt.Printf(" tier %d: ", p.Tier)
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if err := buildOne(ctx, source, e.Source.Path, e.Source.Ref, 0); err != nil {
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state.State = "failed"
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state.Why = err.Error()
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p.State = inventory.PlanFailed
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p.Note = fmt.Sprintf("%s could not be asked for: %v", name, err)
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continue
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}
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state.State = "asked"
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state.AskedAt = &now
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}
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return nil
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}
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// planBuilt marks a module built (or failed) in every open plan whose current tier holds it, and
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// advances what that completes. Called from the daemon's take-in of every outcome.
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func planBuilt(ctx context.Context, open *stores, module, commit, failed string) {
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inv := open.inventory
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plans, err := inv.OpenPlans(ctx)
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if err != nil {
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fmt.Printf("plans: cannot read them: %v\n", err)
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return
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}
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now := time.Now().UTC()
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for i := range plans {
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p := &plans[i]
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if p.Tier >= len(p.Tiers) {
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continue
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}
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inTier := false
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for _, m := range p.Tiers[p.Tier] {
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if m == module {
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inTier = true
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}
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}
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if !inTier {
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continue
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}
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state := p.Modules[module]
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if state == nil {
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state = &inventory.PlanModule{}
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p.Modules[module] = state
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}
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if failed != "" {
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state.State = "failed"
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state.Why = failed
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p.State = inventory.PlanFailed
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p.Note = fmt.Sprintf("%s failed to build in tier %d", module, p.Tier)
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} else {
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state.State = "built"
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state.BuiltAt = &now
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state.Commit = commit
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}
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if err := inv.SavePlan(ctx, *p); err != nil {
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fmt.Printf("%s: cannot keep the plan: %v\n", p.ID, err)
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continue
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}
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if p.State == inventory.PlanFailed {
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fmt.Printf("%s: %s; the tiers after it are not asked\n", p.ID, p.Note)
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}
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}
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advancePlans(ctx, open)
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}
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// advancePlans moves every open plan as far as the facts allow: a tier whose modules are all built
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// and whose gates are applied gives way to the next; the last tier done is the plan done. Called
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// after every outcome and on a timer, so a plan waiting on a machine's report moves when it comes.
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func advancePlans(ctx context.Context, open *stores) {
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inv := open.inventory
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plans, err := inv.OpenPlans(ctx)
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if err != nil {
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fmt.Printf("plans: cannot read them: %v\n", err)
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return
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}
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if len(plans) == 0 {
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return
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}
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edges, err := inv.Dependencies(ctx)
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if err != nil {
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fmt.Printf("plans: cannot read the dependencies: %v\n", err)
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return
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}
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rollsOut := func(module string) bool {
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u, err := inv.UpgradeOf(ctx, module)
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return err == nil && u.RollOut
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}
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for i := range plans {
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p := &plans[i]
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for p.Open() {
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moved, err := advanceOnce(ctx, open, p, edges, rollsOut)
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if err != nil {
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fmt.Printf("%s: %v\n", p.ID, err)
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break
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}
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if err := inv.SavePlan(ctx, *p); err != nil {
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fmt.Printf("%s: cannot keep the plan: %v\n", p.ID, err)
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break
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}
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if !moved {
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break
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}
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}
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}
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}
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// advanceOnce takes one step of one plan and says whether anything changed.
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func advanceOnce(ctx context.Context, open *stores, p *inventory.Plan,
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edges []inventory.Edge, rollsOut func(string) bool) (bool, error) {
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inv := open.inventory
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if p.Tier >= len(p.Tiers) {
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p.State = inventory.PlanDone
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fmt.Printf("%s: done — %s at %s, %d tier(s)\n", p.ID, p.Repository, short(p.Commit), len(p.Tiers))
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return true, nil
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}
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tier := p.Tiers[p.Tier]
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// Not yet asked: ask.
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unasked := 0
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for _, m := range tier {
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if s := p.Modules[m]; s == nil || s.State == "" {
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unasked++
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}
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}
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if unasked == len(tier) {
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if err := askTier(ctx, inv, p); err != nil {
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return false, err
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}
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return true, nil
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}
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// Asked: wait for every build.
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var latest time.Time
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for _, m := range tier {
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s := p.Modules[m]
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if s == nil || s.State != "built" {
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return false, nil
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}
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if s.BuiltAt != nil && s.BuiltAt.After(latest) {
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latest = *s.BuiltAt
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}
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}
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// Built: wait for what the next tier needs running.
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needed := gates(*p, edges, rollsOut)
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if len(needed) > 0 {
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reports, err := inv.LastReports(ctx)
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if err != nil {
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return false, err
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}
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var waiting []string
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for _, m := range needed {
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running, err := inv.Running(ctx, m)
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if err != nil {
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return false, err
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}
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state := p.Modules[m]
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if state == nil {
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state = &inventory.PlanModule{}
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p.Modules[m] = state
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}
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// The plan sends what it waits for. A rebuild from the same source commit is not a
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// move the catalogue announces — the build machine rebuilt for a controller change
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// is one — so the roll-out that opens this gate is the plan's to make, once, and
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// the reports that open it are the ones after the send.
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if state.SentAt == nil && len(running) > 0 {
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if err := sendTo(ctx, open, running); err != nil {
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return false, fmt.Errorf("sending %s to %s so tier %d can be built by it: %w",
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m, strings.Join(running, ", "), p.Tier+1, err)
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}
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now := time.Now().UTC()
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state.SentAt = &now
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fmt.Printf("%s: tier %d built; sent %s to %s, and tier %d waits until it is applied\n",
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p.ID, p.Tier, m, strings.Join(running, ", "), p.Tier+1)
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return true, nil
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}
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since := latest
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if state.BuiltAt != nil {
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since = *state.BuiltAt
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}
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if state.SentAt != nil && state.SentAt.After(since) {
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since = *state.SentAt
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}
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if ok, on := applied(m, since, running, reports); !ok {
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waiting = append(waiting, fmt.Sprintf("%s on %s", m, strings.Join(on, ", ")))
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}
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}
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if len(waiting) > 0 {
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note := "tier " + fmt.Sprint(p.Tier) + " built; waiting for " + strings.Join(waiting, "; ") + " to be applied"
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changed := p.State != inventory.PlanRolling || p.Note != note
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p.State = inventory.PlanRolling
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p.Note = note
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return changed, nil
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}
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}
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p.Tier++
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p.State = inventory.PlanBuilding
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p.Note = ""
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if p.Tier < len(p.Tiers) {
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fmt.Printf("%s: tier %d done; asking tier %d: %s\n", p.ID, p.Tier-1, p.Tier, strings.Join(p.Tiers[p.Tier], ", "))
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}
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return true, nil
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}
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// planTicker advances open plans on a timer, for the steps outcomes alone cannot take.
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func planTicker(ctx context.Context, open *stores) {
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advancePlans(ctx, open)
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tick := time.NewTicker(30 * time.Second)
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defer tick.Stop()
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for {
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select {
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case <-ctx.Done():
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return
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case <-tick.C:
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advancePlans(ctx, open)
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}
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}
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}
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// planLine is one plan as `status` says it.
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func planLine(p inventory.Plan, now time.Time) string {
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where := fmt.Sprintf("tier %d of %d", min(p.Tier+1, len(p.Tiers)), len(p.Tiers))
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switch p.State {
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case inventory.PlanDone:
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return fmt.Sprintf("%s %s done, %d tier(s)", p.Repository, short(p.Commit), len(p.Tiers))
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case inventory.PlanFailed:
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return fmt.Sprintf("%s %s FAILED at %s: %s", p.Repository, short(p.Commit), where, p.Note)
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}
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since := now.Sub(p.Updated).Round(time.Minute)
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late := ""
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if since > planWaitBound {
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|
late = " — LATE"
|
|
}
|
|
what := "building"
|
|
if p.State == inventory.PlanRolling {
|
|
what = p.Note
|
|
}
|
|
return fmt.Sprintf("%s %s %s, %s for %s%s", p.Repository, short(p.Commit), where, what, since, late)
|
|
}
|
|
|
|
// planFailedBuild marks the module a failed build was for when the result names no module: by the
|
|
// repository and path the plan's modules were asked at.
|
|
func planFailedBuild(ctx context.Context, open *stores, result link.BuildResult) {
|
|
entries, err := open.inventory.Catalogued(ctx)
|
|
if err != nil {
|
|
return
|
|
}
|
|
for _, e := range entries {
|
|
if repositoryMatches(e.Source.Repository, result.Repository) && e.Source.Path == result.Path {
|
|
planBuilt(ctx, open, e.Manifest.Module, result.Commit, result.Failed)
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
func repositoryMatches(a, b string) bool {
|
|
trim := func(s string) string { return strings.ToLower(strings.TrimSuffix(s, ".git")) }
|
|
return trim(a) == trim(b) || strings.HasSuffix(trim(a), "/"+trim(b)) || strings.HasSuffix(trim(b), "/"+trim(a))
|
|
}
|
|
|
|
// planStatus is one plan as `status --json` says it.
|
|
type planStatus struct {
|
|
ID string `json:"id"`
|
|
Repository string `json:"repository"`
|
|
Commit string `json:"commit"`
|
|
State string `json:"state"`
|
|
Tier int `json:"tier"`
|
|
Tiers int `json:"tiers"`
|
|
Waiting string `json:"waiting,omitempty"`
|
|
Since time.Time `json:"since"`
|
|
Late bool `json:"late"`
|
|
}
|
|
|
|
func planStatuses(plans []inventory.Plan, now time.Time) []planStatus {
|
|
out := make([]planStatus, 0, len(plans))
|
|
for _, p := range plans {
|
|
ps := planStatus{ID: p.ID, Repository: p.Repository, Commit: p.Commit, State: p.State,
|
|
Tier: p.Tier, Tiers: len(p.Tiers), Since: p.Updated}
|
|
if p.Open() {
|
|
ps.Waiting = p.Note
|
|
if ps.Waiting == "" {
|
|
ps.Waiting = "builds of tier " + fmt.Sprint(p.Tier)
|
|
}
|
|
ps.Late = now.Sub(p.Updated) > planWaitBound
|
|
}
|
|
out = append(out, ps)
|
|
}
|
|
return out
|
|
}
|
|
|
|
// openPlans is the open plans among the recent ones, and how many have waited past the bound.
|
|
func openPlans(plans []inventory.Plan) ([]inventory.Plan, int) {
|
|
var open []inventory.Plan
|
|
late := 0
|
|
for _, p := range plans {
|
|
if p.Open() {
|
|
open = append(open, p)
|
|
if time.Since(p.Updated) > planWaitBound {
|
|
late++
|
|
}
|
|
}
|
|
}
|
|
return open, late
|
|
}
|
|
|
|
// plansCommand says what the last merges produced and where each stands; given an id, one plan
|
|
// tier by tier with every module's state.
|
|
func plansCommand(ctx context.Context, args []string) error {
|
|
set := flag.NewFlagSet("plans", flag.ContinueOnError)
|
|
limit := set.Int("n", 10, "how many to show")
|
|
positionals, err := parseAround(set, args)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
open, err := openStores(ctx)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer open.Close()
|
|
inv := open.inventory
|
|
now := time.Now()
|
|
if len(positionals) == 1 {
|
|
p, err := inv.PlanByID(ctx, positionals[0])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
fmt.Printf("%s — %s\n", p.ID, planLine(p, now))
|
|
for i, tier := range p.Tiers {
|
|
marker := " "
|
|
if i == p.Tier && p.Open() {
|
|
marker = ">"
|
|
}
|
|
fmt.Printf("%s tier %d\n", marker, i)
|
|
for _, m := range tier {
|
|
s := p.Modules[m]
|
|
state := "not yet asked"
|
|
if s != nil && s.State != "" {
|
|
state = s.State
|
|
if s.Commit != "" {
|
|
state += " from " + short(s.Commit)
|
|
}
|
|
if s.Why != "" {
|
|
state += ": " + s.Why
|
|
}
|
|
}
|
|
fmt.Printf(" %-22s %s\n", m, state)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
if len(positionals) == 2 && positionals[0] == "stop" {
|
|
p, err := inv.PlanByID(ctx, positionals[1])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !p.Open() {
|
|
return fmt.Errorf("%s is already %s", p.ID, p.State)
|
|
}
|
|
p.State = inventory.PlanFailed
|
|
p.Note = "stopped by hand at tier " + fmt.Sprint(p.Tier)
|
|
if err := inv.SavePlan(ctx, p); err != nil {
|
|
return err
|
|
}
|
|
fmt.Printf("%s stopped at tier %d of %d; what was asked still builds and registers, nothing further is asked\n",
|
|
p.ID, p.Tier, len(p.Tiers))
|
|
return nil
|
|
}
|
|
plans, err := inv.RecentPlans(ctx, *limit)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(plans) == 0 {
|
|
fmt.Println("no merge has produced a plan yet")
|
|
return nil
|
|
}
|
|
for _, p := range plans {
|
|
fmt.Printf("%-28s %s\n", p.ID, planLine(p, now))
|
|
}
|
|
return nil
|
|
}
|