363 lines
11 KiB
Go
363 lines
11 KiB
Go
package engine
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import (
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"slices"
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"gitea.maximumdirect.net/eric/ConfigKit/internal/document"
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)
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// resolutionInput is the immutable entry-state provenance available to a
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// resolution callback. It owns detached metadata and source records so later
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// resolution updates cannot change the entry view.
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type resolutionInput struct {
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metadata Metadata
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sources map[string]SourceInfo
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contexts map[string]ResourceContext
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}
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func newResolutionInput(metadata Metadata, final *document.Node, sources []SourceInfo, contexts ...map[string]ResourceContext) resolutionInput {
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frozen := Metadata{
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fields: make(map[string]FieldInfo, len(metadata.fields)),
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effectivePaths: effectivePathIndex(final),
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}
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for pointer, info := range metadata.fields {
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frozen.fields[pointer] = cloneFieldInfo(info)
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}
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indexed := make(map[string]SourceInfo, len(sources))
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for _, source := range sources {
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if source.ID == "" {
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panic("configkit: source identity is missing")
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}
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if _, exists := indexed[source.ID]; exists {
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panic("configkit: source identity is duplicated")
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}
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indexed[source.ID] = cloneSourceInfo(source)
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}
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result := resolutionInput{metadata: frozen, sources: indexed}
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if len(contexts) != 0 {
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result.contexts = cloneResourceContexts(contexts[0])
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}
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return result
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}
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func (input resolutionInput) lookup(path Path) (FieldInfo, bool) {
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return input.metadata.Lookup(path)
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}
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func (input resolutionInput) source(id string) (SourceInfo, bool) {
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source, ok := input.sources[id]
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if !ok {
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return SourceInfo{}, false
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}
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return cloneSourceInfo(source), true
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}
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func (input resolutionInput) sourceContext(id string) (ResourceContext, bool) {
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context, ok := input.contexts[id]
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return context, ok
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}
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func metadataFromDecoded(decoded decodedConfiguration) Metadata {
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metadata := Metadata{
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fields: make(map[string]FieldInfo),
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history: make(map[string][]Change),
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}
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baseline := make(map[string]*document.Node)
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indexDocument(decoded.baseline, Path{}, baseline)
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for pointer := range baseline {
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path, err := ParsePath(pointer)
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if err != nil {
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continue
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}
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metadata.history[pointer] = append(metadata.history[pointer], Change{
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Path: path, Origin: Origin{Layer: LayerDefault},
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})
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}
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for pointer := range decoded.presence {
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path, err := ParsePath(pointer)
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if err != nil {
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continue
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}
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origin := cloneOrigin(decoded.origins[pointer])
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change := Change{Path: path, Origin: origin}
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if _, ok := baseline[pointer]; ok {
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change.Previous = []Origin{{Layer: LayerDefault}}
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}
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metadata.history[pointer] = append(metadata.history[pointer], change)
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}
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collectFieldInfo(decoded.final, Path{}, decoded, metadata.fields)
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return metadata
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}
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func applyOverlayMetadata(metadata *Metadata, records []overlayRecord) {
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baseline := make(map[string][]Change, len(metadata.history))
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for pointer, history := range metadata.history {
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for _, change := range history {
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if change.Origin.Layer == LayerDefault {
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baseline[pointer] = append(baseline[pointer], cloneChange(change))
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}
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}
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}
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events := make(map[string][]Change)
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for _, record := range records {
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exact := false
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for _, displaced := range record.displaced {
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pointer := displaced.path.String()
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appendInputOriginEvent(events, baseline, pointer, displaced.path, displaced.origin)
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appendInputChangeEvent(events, baseline, pointer, record.change)
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if pointer == record.change.Path.String() {
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exact = true
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}
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}
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if !exact {
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pointer := record.change.Path.String()
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for _, previous := range record.change.Previous {
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appendInputOriginEvent(events, baseline, pointer, record.change.Path, previous)
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}
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appendInputChangeEvent(events, baseline, pointer, record.change)
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}
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}
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for pointer, info := range metadata.fields {
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if !info.Explicit {
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continue
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}
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path, err := ParsePath(pointer)
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if err != nil {
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continue
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}
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appendInputOriginEvent(events, baseline, pointer, path, info.Origin)
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}
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metadata.history = make(map[string][]Change, len(baseline)+len(events))
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for pointer, history := range baseline {
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metadata.history[pointer] = cloneChanges(history)
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}
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for pointer, history := range events {
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metadata.history[pointer] = append(metadata.history[pointer], cloneChanges(history)...)
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}
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}
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func appendInputOriginEvent(events map[string][]Change, baseline map[string][]Change, pointer string, path Path, origin Origin) {
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if origin.Layer == "" {
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return
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}
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history := events[pointer]
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if len(history) != 0 && originRepresentedByChange(path, origin, history[len(history)-1]) {
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return
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}
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appendInputChangeEvent(events, baseline, pointer, Change{Path: path.clone(), Origin: cloneOrigin(origin)})
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}
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func originRepresentedByChange(path Path, origin Origin, change Change) bool {
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if change.Path.String() == path.String() {
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return originContainedBy(origin, change.Origin)
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}
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if !pathContains(change.Path, path) || origin.Layer != change.Origin.Layer || origin.Operation != change.Origin.Operation {
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return false
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}
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// A subtree replacement already records its descendants' contributions.
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// Their coordinates differ from the container's, but their sources must be
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// covered by the operation; matching only the precedence role is insufficient.
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for _, location := range origin.Locations {
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found := false
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for _, recorded := range change.Origin.Locations {
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if location.SourceID == recorded.SourceID {
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found = true
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break
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}
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}
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if !found {
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return false
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}
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}
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return true
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}
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func appendInputChangeEvent(events map[string][]Change, baseline map[string][]Change, pointer string, value Change) {
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change := cloneChange(value)
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history := events[pointer]
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if len(history) != 0 {
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change.Previous = []Origin{cloneOrigin(history[len(history)-1].Origin)}
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} else if defaults := baseline[pointer]; len(defaults) != 0 {
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change.Previous = []Origin{cloneOrigin(defaults[len(defaults)-1].Origin)}
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} else {
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change.Previous = nil
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}
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events[pointer] = append(history, change)
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}
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func originContainedBy(candidate, container Origin) bool {
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if candidate.Layer != container.Layer || candidate.Operation != container.Operation {
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return false
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}
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for _, location := range candidate.Locations {
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found := false
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for _, available := range container.Locations {
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if location == available {
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found = true
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break
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}
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}
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if !found {
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return false
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}
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}
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return true
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}
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func cloneChanges(changes []Change) []Change {
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cloned := make([]Change, len(changes))
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for index, change := range changes {
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cloned[index] = cloneChange(change)
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}
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return cloned
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}
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func collectFieldInfo(node *document.Node, path Path, decoded decodedConfiguration, fields map[string]FieldInfo) {
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pointer := path.String()
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_, explicit := decoded.presence[pointer]
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fields[pointer] = FieldInfo{
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Explicit: explicit,
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Null: node.Kind == document.Null,
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Origin: cloneOrigin(decoded.origins[pointer]),
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}
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switch node.Kind {
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case document.Mapping:
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for _, entry := range node.Mapping {
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collectFieldInfo(entry.Value, path.Key(entry.Key), decoded, fields)
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}
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case document.Sequence:
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for index, child := range node.Sequence {
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collectFieldInfo(child, path.Index(index), decoded, fields)
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}
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}
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}
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func cloneMetadata(metadata Metadata) Metadata {
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if metadata.fields == nil && metadata.history == nil {
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return Metadata{}
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}
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cloned := Metadata{
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fields: make(map[string]FieldInfo, len(metadata.fields)),
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history: make(map[string][]Change, len(metadata.history)),
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}
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cloned.effectivePaths = make(map[string]Path, len(metadata.effectivePaths))
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for pointer, path := range metadata.effectivePaths {
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cloned.effectivePaths[pointer] = path.clone()
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}
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cloned.historicalPaths = make(map[string][]Path, len(metadata.historicalPaths))
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for pointer, paths := range metadata.historicalPaths {
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cloned.historicalPaths[pointer] = clonePaths(paths)
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}
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for path, info := range metadata.fields {
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cloned.fields[path] = cloneFieldInfo(info)
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}
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for path, changes := range metadata.history {
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clonedChanges := make([]Change, len(changes))
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for index, change := range changes {
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clonedChanges[index] = cloneChange(change)
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}
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cloned.history[path] = clonedChanges
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}
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return cloned
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}
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func applyResolutionMetadata(metadata *Metadata, resolved resolutionResult) {
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for _, snapshot := range resolved.snapshots {
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pointer := snapshot.change.Path.String()
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change := cloneChange(snapshot.change)
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if info, ok := metadata.fields[pointer]; ok {
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change.Previous = []Origin{cloneOrigin(info.Origin)}
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info.Origin = cloneOrigin(change.Origin)
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metadata.fields[pointer] = info
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}
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metadata.history[pointer] = append(metadata.history[pointer], change)
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}
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appendResolutionDescendantHistory(metadata, resolved)
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for _, delta := range resolved.deltas {
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record := coveringResolutionSnapshot(resolved.snapshots, delta.path)
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if record == nil {
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continue
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}
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for pointer, info := range metadata.fields {
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path, err := ParsePath(pointer)
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if err != nil || !pathContains(delta.path, path) {
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continue
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}
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info.Origin = cloneOrigin(record.change.Origin)
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metadata.fields[pointer] = info
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}
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}
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refreshResolutionFields(metadata.fields, resolved.final, resolved.snapshots)
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}
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func appendResolutionDescendantHistory(metadata *Metadata, resolved resolutionResult) {
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finalPaths := make(map[string]*document.Node)
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indexDocument(resolved.final, Path{}, finalPaths)
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for _, delta := range resolved.deltas {
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record := coveringResolutionSnapshot(resolved.snapshots, delta.path)
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if record == nil {
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continue
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}
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affected := make(map[string]bool)
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for pointer := range metadata.history {
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if path, err := ParsePath(pointer); err == nil && pathContains(delta.path, path) {
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affected[pointer] = true
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}
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}
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for pointer := range finalPaths {
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if path, err := ParsePath(pointer); err == nil && pathContains(delta.path, path) {
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affected[pointer] = true
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}
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}
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pointers := make([]string, 0, len(affected))
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for pointer := range affected {
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if pointer != record.change.Path.String() {
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pointers = append(pointers, pointer)
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}
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}
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slices.Sort(pointers)
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for _, pointer := range pointers {
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change := cloneChange(record.change)
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if info, ok := metadata.fields[pointer]; ok {
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change.Previous = []Origin{cloneOrigin(info.Origin)}
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}
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metadata.history[pointer] = append(metadata.history[pointer], change)
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}
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}
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}
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func coveringResolutionSnapshot(snapshots []resolutionSnapshot, path Path) *resolutionSnapshot {
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var covering *resolutionSnapshot
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for index := range snapshots {
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snapshot := &snapshots[index]
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if pathContains(snapshot.change.Path, path) && (covering == nil || len(snapshot.change.Path.segments) > len(covering.change.Path.segments)) {
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covering = snapshot
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}
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}
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return covering
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}
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func refreshResolutionFields(fields map[string]FieldInfo, final *document.Node, snapshots []resolutionSnapshot) {
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finalPaths := make(map[string]*document.Node)
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indexDocument(final, Path{}, finalPaths)
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for pointer := range fields {
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if _, ok := finalPaths[pointer]; !ok {
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delete(fields, pointer)
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}
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}
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for pointer, node := range finalPaths {
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if info, ok := fields[pointer]; ok {
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info.Null = node.Kind == document.Null
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fields[pointer] = info
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continue
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}
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origin := Origin{Layer: LayerResolution}
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if path, err := ParsePath(pointer); err == nil {
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if covering := coveringResolutionSnapshot(snapshots, path); covering != nil {
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origin = cloneOrigin(covering.change.Origin)
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}
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}
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fields[pointer] = FieldInfo{Null: node.Kind == document.Null, Origin: origin}
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}
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}
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