mesh-tools
97a2d841c7
The controller plans config, templates and moved providers' provisions, hands bus accounts to the vault and judges the new manifest words, on the feature's SDK and node-engine validator (feature 57, config and provisioning).
292 lines
12 KiB
Go
292 lines
12 KiB
Go
package catalogue
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import (
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"fmt"
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"regexp"
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"strings"
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)
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// A module contributes to a seat it does not hold (novox/hq ADR 0212).
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//
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// ADR 0210 made a tool's configuration its seat holder's, and every other module's way in a
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// contribution to the seat. The environment, the shell's slots and the power moments each became a
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// field of their own; this is the general form, so a new seat that takes contributions is a row in
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// the seat table rather than a change to the manifest: a contribution names a seat, a kind that
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// seat receives, and text in the tool's own grammar, which the controller never reads.
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// HotkeysSeat is the machine's hotkey daemon (novox/hq ADR 0212 §5).
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const HotkeysSeat = "node-hotkeys"
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// MessageBusSeat is the machine's D-Bus (novox/hq ADR 0215).
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const MessageBusSeat = "node-message-bus"
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// BackupSeat is the machine's backups (novox/hq ADR 0214, to-be 43).
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const BackupSeat = "node-backup"
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// SeatContribution is one piece of configuration a module gives a seat's holder to place.
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type SeatContribution struct {
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// Seat is the seat whose holder places it.
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Seat string `json:"seat"`
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// Kind is which of the seat's receivable kinds it is.
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Kind string `json:"kind"`
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// Content is the text, in the tool's own grammar. Never interpreted.
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Content string `json:"content,omitempty"`
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// Data is the piece in the seat's own shape, for a kind the seat receives as data (novox/hq ADR
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// 0255): the holder renders it with its template, and Content is then empty.
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Data map[string]any `json:"data,omitempty"`
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// IfCapability names a capability the machine must report for this contribution to be placed
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// there (novox/hq ADR 0255): a battery's block only where the node-engine found a battery. The
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// composition decides, from the machine's facts, not the tool at run time.
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IfCapability string `json:"if-capability,omitempty"`
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}
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// ofContribution is where a holder places a kind: ${contribution:<seat>:<kind>}. Loose inside the
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// braces, so a misspelt seat or kind is found and refused rather than written out as text.
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var ofContribution = regexp.MustCompile(`\$\{contribution:([^}]*)\}`)
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// receivable is what a seat receives of a kind, with the seat's canonical name; false when the seat
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// is unknown or does not receive it.
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func receivable(seat, kind string) (Seat, Receivable, bool) {
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s, known := SeatNamed(seat)
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if !known {
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return Seat{}, Receivable{}, false
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}
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for _, r := range s.Receives {
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if r.Kind == kind {
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return s, r, true
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}
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}
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return s, Receivable{}, false
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}
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// kindsOf names a seat's receivable kinds for a refusal.
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func kindsOf(s Seat) string {
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if len(s.Receives) == 0 {
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return "it receives no contributions"
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}
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var kinds []string
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for _, r := range s.Receives {
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kinds = append(kinds, r.Kind)
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}
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return "it receives " + strings.Join(kinds, ", ")
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}
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// seatContributionProblems is what is wrong with this module's contributions, from the manifest
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// alone (novox/hq ADR 0212 §2).
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func (m Manifest) seatContributionProblems() []string {
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var problems []string
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for i, c := range m.Contributions {
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s, r, ok := receivable(c.Seat, c.Kind)
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// A directory a contribution names must be one of this module's own, here rather than on the
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// machine — where a `${dir:x}` nobody declared would reach the holder as the literal text.
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if ok && r.Dirs {
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declared := map[string]string{}
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for _, res := range m.Resources {
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if fmt.Sprint(res["type"]) == "directory" {
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declared[fmt.Sprint(res["id"])] = ""
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}
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}
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if _, err := dirFill(c.Content, declared, m.Module); err != nil {
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problems = append(problems, fmt.Sprintf("%s's contribution %d: %v", m.Module, i+1, err))
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}
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}
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switch {
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case s.Name == "":
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problems = append(problems, fmt.Sprintf(
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"%s's contribution %d is to the seat %q, which the mesh does not define", m.Module, i+1, c.Seat))
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case !ok:
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problems = append(problems, fmt.Sprintf(
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"%s's contribution %d to %s is of the kind %q; %s (novox/hq ADR 0212)",
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m.Module, i+1, s.Name, c.Kind, kindsOf(s)))
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}
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// Only on a kind the seat offers (novox/hq ADR 0255): a piece shown where the hardware is. On a
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// kind a holder depends on — what a backup keeps, a key's trigger — a machine missing the
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// capability would lose the piece without a word.
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if c.IfCapability != "" {
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switch {
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case !capabilityName.MatchString(c.IfCapability):
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problems = append(problems, fmt.Sprintf("%s's contribution %d is if-capability %q, which is not a "+
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"capability's name", m.Module, i+1, c.IfCapability))
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case !oneOf(KnownCapabilities, c.IfCapability):
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problems = append(problems, fmt.Sprintf("%s's contribution %d is if-capability %q, which no machine "+
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"reports; the node-engine detects %s", m.Module, i+1, c.IfCapability, strings.Join(KnownCapabilities, ", ")))
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case ok && !r.Offered:
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problems = append(problems, fmt.Sprintf("%s's contribution %d to %s (%s) is if-capability %s; only a "+
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"kind the seat offers may be left out where a machine lacks something (novox/hq ADR 0255)",
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m.Module, i+1, s.Name, c.Kind, c.IfCapability))
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}
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}
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switch {
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case ok && r.Shape != nil:
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problems = append(problems, shapedProblems(m.Module, i, r, c)...)
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problems = append(problems, ownStateProblems(m, i, r, c)...)
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case len(c.Data) > 0:
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problems = append(problems, fmt.Sprintf("%s's contribution %d has data; %s receives %s as text, "+
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"given as `content`", m.Module, i+1, s.Name, c.Kind))
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case strings.TrimSpace(c.Content) == "":
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problems = append(problems, fmt.Sprintf("%s's contribution %d has no content", m.Module, i+1))
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}
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}
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return problems
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}
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// seatPlaceholderProblems is what is wrong with one resource's ${contribution:…}: placed only in a
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// file's content, naming a seat and a kind it receives, and only by a module that claims that seat
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// — another would be a second writer of a file there is one of (novox/hq ADR 0212 §3).
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func seatPlaceholderProblems(m Manifest, r map[string]any) []string {
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var problems []string
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for _, field := range sortedKeys(r) {
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v, ok := r[field].(string)
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if !ok {
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continue
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}
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found := ofContribution.FindAllStringSubmatch(v, -1)
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if len(found) == 0 {
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continue
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}
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if field != "content" {
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problems = append(problems, fmt.Sprintf(
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"%s's resource %v names %s in its %s; contributions are placed only in a file's content",
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m.Module, r["id"], found[0][0], field))
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continue
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}
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for _, f := range found {
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seat, rest, two := strings.Cut(f[1], ":")
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// A kind received as data may be narrowed by its shape's placing fields (novox/hq ADR 0255).
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kind, where, _ := strings.Cut(rest, ":")
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s, rcv, ok := receivable(seat, kind)
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if two && ok {
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if _, err := placeholderWhere(rcv, where); err != nil {
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problems = append(problems, fmt.Sprintf("%s's resource %v names %s: %v", m.Module, r["id"], f[0], err))
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}
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}
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if !two || !ok {
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detail := "the mesh defines no seat " + fmt.Sprintf("%q", seat)
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if s.Name != "" {
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detail = s.Name + ": " + kindsOf(s)
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}
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problems = append(problems, fmt.Sprintf(
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"%s's resource %v names %s; a contribution is ${contribution:<seat>:<kind>} (%s)",
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m.Module, r["id"], f[0], detail))
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continue
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}
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if !m.ClaimsSeat(s.Name) {
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problems = append(problems, fmt.Sprintf(
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"%s's resource %v names %s and %s does not claim %s; every module's contributions to a "+
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"seat are placed by its holder alone (novox/hq ADR 0212)",
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m.Module, r["id"], f[0], m.Module, s.Name))
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}
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}
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}
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return problems
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}
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// seatContributions is every module's contribution of one kind to one seat (novox/hq ADR 0212 §3):
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// in module order, each module's pieces in the order it declared them, each module's preceded by a
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// comment line naming it in the tool's grammar, and empty when nothing is contributed. A kind that
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// takes directories has each contributor's `${dir:<id>}` filled with where that module's directory
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// is on this machine (novox/hq to-be 43).
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//
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// A directory placed in a person's home is named `${machine:account-home}/…` (novox/hq to-be 29); in a
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// kind that takes directories that is filled from the machine's facts as well, so the holder reads a
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// path, never a placeholder (novox/hq ADR 0233: an item in the operator's home is backed up too).
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//
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// A kind received as data is rendered through the holder's template instead, narrowed by where
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// (novox/hq ADR 0255); and a contribution naming a capability this machine did not report is left
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// out, of either form.
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//
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// What it could not render is answered as unplaced, each naming its module and why, and left out: one
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// piece the holder's template does not know is that piece's fault, not the machine's.
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func seatContributions(modules []Manifest, holder Manifest, placeholder string, with Rendering, facts map[string]string, caps map[string]bool) (string, []string, error) {
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seat, rest, _ := strings.Cut(placeholder, ":")
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kind, whereText, _ := strings.Cut(rest, ":")
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s, r, ok := receivable(seat, kind)
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if !ok {
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return "", nil, nil
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}
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if r.Shape != nil {
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where, err := placeholderWhere(r, whereText)
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if err != nil {
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return "", nil, err
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}
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return shapedContributions(modules, holder, facts["name"], facts, s, r, where, caps)
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}
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var failed error
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var unplacedLines []string
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var blocks []textBlock
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for _, m := range inModuleOrder(modules) {
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var old strings.Builder
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// A left-out module's lines are best effort (novox/hq ADR 0262): what cannot be placed is said,
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// and the machine is declared without it. A placement setting that does not read is not
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// replaced by the definition's own path, which may not be where the data is.
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if m.bestEffort && r.Dirs {
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if _, err := Places(m, with.Settings[m.Module]); err != nil {
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unplacedLines = append(unplacedLines, fmt.Sprintf("%s's %s for %s, kept while it is left out, "+
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"is not placed: its placement setting does not read (%v)", m.Module, kind, s.Name, err))
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continue
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}
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}
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for _, c := range m.allContributions() {
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if c.Kind != kind || !capable(c, caps) {
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continue
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}
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if cs, known := SeatNamed(c.Seat); !known || cs.Name != s.Name {
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continue
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}
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content := c.Content
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var lineFailed error
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if r.Dirs {
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filled, err := dirFill(content, dirsFor(m, with), m.Module)
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if err != nil && lineFailed == nil {
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lineFailed = err
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}
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// An operator's path the module was given, as an item of data on it (novox/hq ADR 0233).
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if accessRef.MatchString(filled) {
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_, byID, err := accessesFor(m, with.Settings[m.Module])
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if err == nil {
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filled, err = accessFill(filled, byID, m.Module)
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}
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if err != nil && lineFailed == nil {
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lineFailed = err
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}
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}
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for _, key := range machineUsed(filled) {
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value, has := facts[key]
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if !has {
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if lineFailed == nil {
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lineFailed = fmt.Errorf("%s's %s for %s says ${machine:%s}, and this machine says %s",
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m.Module, kind, s.Name, key, orNothing(namesOfFacts(facts)))
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}
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continue
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}
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filled = strings.ReplaceAll(filled, "${machine:"+key+"}", value)
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}
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content = filled
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}
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if lineFailed != nil {
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if m.bestEffort {
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unplacedLines = append(unplacedLines, fmt.Sprintf("%s's %s for %s, kept while it is left "+
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"out, is not placed: %v", m.Module, kind, s.Name, lineFailed))
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continue
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}
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if failed == nil {
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failed = lineFailed
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}
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}
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if old.Len() == 0 {
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fmt.Fprintf(&old, "%s %s\n", r.Comment, m.Module)
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}
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old.WriteString(content)
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if !strings.HasSuffix(content, "\n") {
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old.WriteString("\n")
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}
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}
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var held []heldItem
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if !r.Dirs {
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held = heldItems(m, "contribution:"+s.Name+":"+kind, nil, facts, caps)
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}
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blocks = append(blocks, moduleBlocks(m, r.Comment, old.String(), held)...)
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}
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return joinBlocks(blocks), unplacedLines, failed
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}
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