54 lines
2.2 KiB
Go
54 lines
2.2 KiB
Go
package catalogue
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import (
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"fmt"
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"regexp"
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)
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// What the machine's modules back up is placement (design 57 L3, issue 794). The holder of node-backup names it as
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// `${backup:lines}` (what to run and which paths to keep) and `${backup:data}` (every item with its class and
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// protection): the text `${contribution:node-backup:backup}` and `${contribution:node-backup:data}` render, from the
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// same function, derived from each placed module's declared data (novox/hq ADR 0233). A handed holder has the text in
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// its plan's placement for its client to fill; one not handed has the controller fill it where it stands.
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// BackupNamespace is the placeholder kind of the machine's backup lines and data.
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const BackupNamespace = "backup"
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// ofBackup is where a holder places them: ${backup:<key>}. Loose inside the braces, so a misspelt key is found and
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// refused rather than written out as text.
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var ofBackup = regexp.MustCompile(`\$\{backup:([^}]*)\}`)
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// backupKinds is the contribution kind each key of the backup placement renders.
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var backupKinds = map[string]string{"lines": BackupKindBackup, "data": BackupKindData}
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// backupPlacer is the machine's modules the backup placement is composed over, as the old contributions are.
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type backupPlacer struct {
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modules []Manifest
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with Rendering
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facts map[string]string
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caps map[string]bool
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unplaced *[]string
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}
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// placed is the text of one key for a holder, or what is wrong with naming it.
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func (b backupPlacer) placed(holder Manifest, key string, item bool) (string, string) {
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kind, known := backupKinds[key]
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switch {
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case item:
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return "", "an item is kept per item; the machine's backup lines are placed only in a file"
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case !known:
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return "", fmt.Sprintf("the backup placement has `lines` and `data`, not %q", key)
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case !holder.ClaimsSeat(BackupSeat):
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return "", fmt.Sprintf("%s does not claim %s; the machine's backup lines are placed by its holder alone "+
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"(novox/hq ADR 0212)", holder.Module, BackupSeat)
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}
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text, left, err := seatContributions(b.modules, holder, BackupSeat+":"+kind, b.with, b.facts, b.caps)
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if b.unplaced != nil {
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*b.unplaced = append(*b.unplaced, left...)
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}
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if err != nil {
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return "", err.Error()
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}
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return text, ""
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}
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