542 lines
23 KiB
Go
542 lines
23 KiB
Go
package engine
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import (
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"bytes"
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"errors"
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"io/fs"
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"strconv"
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"gitea.maximumdirect.net/eric/ConfigKit/internal/document"
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yamladapter "gitea.maximumdirect.net/eric/ConfigKit/internal/yaml"
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)
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type importAdmissionOutcome uint8
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const (
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importAdmissionReady importAdmissionOutcome = iota
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importAdmissionOptionalMissing
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)
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type admittedImport struct {
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canonical string
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identity resourceIdentity
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nodeKey importNodeKey
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source SourceInfo
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sourceIndex int
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payload *document.Node
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declarations []importDeclarationSpec
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sequenceDeclarations []sequenceDeclarationSpec
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processing *sourceVersionProcessingResult
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}
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type importAdmissionResult struct {
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outcome importAdmissionOutcome
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source admittedImport
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}
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func acquireImportedInput(request importAcquisitionRequest, policy *acquisitionPolicy, state *acquisitionState, tier *tierAcquisitionState) (*composedDocument, []SourceInfo, *resolvedFilesystemContext, []Diagnostic) {
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source := request.input.input.source
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context := request.input.input.filesystem
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main := request.main
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resolved, diagnostic := resolveFilesystemContext(source, context, main, tier.hostToken)
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if diagnostic != nil {
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return nil, sourceInfos(main.source), nil, []Diagnostic{*diagnostic}
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}
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if resolved.native == nil {
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if diagnostic := validateResolvedFilesystemDirectories(resolved); diagnostic != nil {
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return nil, sourceInfos(main.source), nil, []Diagnostic{*diagnostic}
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}
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}
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access, err := openResolvedFilesystemAccess(resolved)
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if err != nil {
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diagnostic := globFilesystemDiagnostic(err, "configuration root could not be opened", Location{})
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diagnostic.Primary = nil
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return nil, sourceInfos(main.source), nil, []Diagnostic{diagnostic}
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}
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composition, sources, diagnostics := acquireImportedWithAccess(request, policy, state, tier, access, resolved)
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if len(diagnostics) != 0 {
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return composition, sources, nil, diagnostics
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}
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return composition, sources, &resolved, nil
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}
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func acquireImportedWithAccess(request importAcquisitionRequest, policy *acquisitionPolicy, loadState *acquisitionState, tier *tierAcquisitionState, access *filesystemAccess, resolved resolvedFilesystemContext) (*composedDocument, []SourceInfo, []Diagnostic) {
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closed := false
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closeAccess := func() error {
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if closed {
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return nil
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}
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closed = true
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return access.close()
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}
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defer func() { _ = closeAccess() }()
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main := request.main
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destination := request.input.input.destination
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limits := policy.importLimits
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accounting := loadState.accounting
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versionState := loadState.versionState
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processing := request.processing
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basePath, mainPath := resolved.basePath, resolved.mainPath
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if tier.visited == nil {
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tier.visited = make(map[resourceIdentity]importRoute)
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}
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visited := tier.visited
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if !access.contains(basePath) || (mainPath != "" && !access.contains(mainPath)) {
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_ = closeAccess()
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return nil, sourceInfos(main.source), []Diagnostic{importDiagnostic(CodeImportOutsideRoot, "selected source and import base must stay inside the configuration root", nil)}
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}
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for _, directory := range []string{access.rootPath, basePath} {
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info, err := access.stat(directory)
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if err != nil || !info.IsDir() {
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_ = closeAccess()
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return nil, sourceInfos(main.source), []Diagnostic{importDiagnostic(CodeImportInvalid, "configuration root and import base must be directories", nil)}
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}
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}
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mainInfo := cloneSourceInfo(*main.source)
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mainInfo.Destination = destination.clone()
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mainIsItem := main.source.placementMode == placementModeSequenceItem
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if mainPath != "" {
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mainInfo.Path = mainPath
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}
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mainResource := access.identity(mainPath)
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mainNodeKey := importKeyFor(access, mainPath, mainPath == "")
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if mainPath == "" {
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mainResource = access.syntheticIdentity()
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}
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if previous, repeated := visited[mainResource]; repeated {
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_ = closeAccess()
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return nil, sourceInfos(main.source), []Diagnostic{importRepeatedDiagnostic(Location{SourceID: main.source.ID}, previous, importRoute{})}
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}
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accounting.sources++
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accounting.bytes += main.bytes
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accounting.nodes += countInputNodes(main.document)
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directiveContext := request.input.directiveContext
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if directiveContext == 0 {
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directiveContext = rootDirectiveContextImportsOnly
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}
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if processing != nil && processing.directiveContext != 0 {
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directiveContext = processing.directiveContext
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}
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request.input.directiveContext = directiveContext
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state := importTraversal{
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access: access, request: request, policy: policy, state: loadState, tier: tier,
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scope: acquisitionScope{owner: mainNodeKey, destination: destination.clone()},
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sources: []SourceInfo{mainInfo},
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active: make(map[resourceIdentity]int),
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importGraph: newImportInclusionGraph(),
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}
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if mainIsItem {
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state.itemScope = true
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state.itemPrefix = destination.clone()
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state.itemFallback = destination.clone()
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state.scope.destination = Path{}
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state.sources[0] = cloneSourceInfo(mainInfo)
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}
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if diagnostic := state.checkInitialLimits(); diagnostic != nil {
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_ = closeAccess()
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return nil, cloneSourceInfos(state.sources), []Diagnostic{*diagnostic}
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}
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mainIdentity := mainPath
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if mainIdentity == "" {
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mainIdentity = "<selected-source>"
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}
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mainRoute := importRoute{canonical: mainIdentity}
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state.importGraph.addNode(importGraphNode{key: mainNodeKey, canonical: mainIdentity, sourceID: mainInfo.ID, role: importRoleMain})
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mainRoute.key = mainNodeKey
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state.active[mainResource] = 0
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tier.visited[mainResource] = mainRoute
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state.stack = append(state.stack, mainRoute)
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var body *document.Node
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var declarations []importDeclarationSpec
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var sequenceDeclarations []sequenceDeclarationSpec
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var diagnostics []Diagnostic
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if processing != nil {
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body = processing.payload
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declarations = processing.imports
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sequenceDeclarations = cloneSequenceDeclarations(processing.sequences)
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} else {
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body, declarations, diagnostics = splitImportDirectives(main.document)
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}
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if len(diagnostics) == 0 {
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if mainIsItem {
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state.scope.contributions = append(state.scope.contributions, acquiredContribution{
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source: cloneSourceInfo(mainInfo), identity: mainNodeKey, role: importRoleMain,
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scopeOwner: mainNodeKey, payload: body, document: body, processing: processing,
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sequenceDeclarations: cloneSequenceDeclarations(sequenceDeclarations),
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})
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diagnostics = state.walkDeclarations(basePath, declarations, 0, Path{}, 0)
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} else {
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_, placed, err := placeDocument(body, destination, body.Location, maxDocumentDepth, maxDocumentNodes)
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placementNodes := destinationWrapperNodeCount(destination)
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if err != nil {
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diagnostics = []Diagnostic{sourceDiagnostic(CodeSourceLimitExceeded, main.source.ID, "configuration exceeds the source depth or node limit after destination placement")}
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} else if accounting.nodes+placementNodes > limits.nodes {
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diagnostics = []Diagnostic{importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the aggregate node limit", nil)}
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} else {
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accounting.nodes += placementNodes
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state.scope.contributions = append(state.scope.contributions, acquiredContribution{
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source: cloneSourceInfo(mainInfo), payload: body, document: placed,
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identity: mainNodeKey, role: importRoleMain, scopeOwner: mainNodeKey,
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destination: destination.clone(), processing: processing,
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sequenceDeclarations: cloneSequenceDeclarations(sequenceDeclarations),
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})
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diagnostics = state.walkDeclarations(basePath, declarations, 0, destination, 0)
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}
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}
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}
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if len(diagnostics) == 0 {
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scheduleAcquisitionScopes(&state.scope, indexImportDependencies(state.importGraph))
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}
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closeErr := closeAccess()
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if len(diagnostics) != 0 {
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if mainIsItem {
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diagnostics = prependCompositionDiagnosticPaths(diagnostics, destination.Index(0))
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}
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return nil, cloneSourceInfos(state.sources), diagnostics
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}
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if closeErr != nil {
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return nil, cloneSourceInfos(state.sources), []Diagnostic{importDiagnostic(CodeImportRead, "configuration root could not be closed", nil)}
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}
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acquisition := state.scope
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if mainIsItem {
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localScope := state.scope
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acquisition = acquisitionScope{
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owner: mainNodeKey, destination: destination.clone(),
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contributions: []acquiredContribution{{
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source: cloneSourceInfo(mainInfo), payload: body, identity: mainNodeKey,
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role: importRoleMain, scopeOwner: mainNodeKey, destination: destination.clone(),
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processing: processing, sequenceDeclarations: cloneSequenceDeclarations(sequenceDeclarations), pendingItem: &localScope,
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}},
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}
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}
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if request.input.deferAssembly {
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if diagnostic := reservePendingItemPlacements(&acquisition, limits, accounting); diagnostic != nil {
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return nil, cloneSourceInfos(state.sources), []Diagnostic{*diagnostic}
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}
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return &composedDocument{
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acquisition: []acquisitionScope{cloneAcquisitionScope(acquisition)},
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importGraph: state.importGraph.clone(), inputBytes: accounting.bytes, inputNodes: accounting.nodes,
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}, cloneSourceInfos(state.sources), nil
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}
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acquired := &composedDocument{
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acquisition: []acquisitionScope{cloneAcquisitionScope(acquisition)},
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importGraph: state.importGraph.clone(), inputBytes: accounting.bytes, inputNodes: accounting.nodes,
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}
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input := assembledInput{
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parsed: main, composition: acquired, acquisition: cloneAcquisitionScopes(acquired.acquisition),
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sources: state.sources, versionState: versionState, accounting: accounting,
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}
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composed, diagnostics := composeAcquiredInputWithPolicies(input, collectionPolicyScope{}, policy.sequencePolicy)
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return composed, cloneSourceInfos(state.sources), diagnostics
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}
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func (s *importTraversal) checkInitialLimits() *Diagnostic {
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if s.state.accounting.sources > s.policy.importLimits.sources {
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value := importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the source-count limit", nil)
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return &value
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}
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if s.state.accounting.bytes > s.policy.importLimits.bytes {
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value := importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the aggregate byte limit", nil)
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return &value
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}
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if s.state.accounting.nodes > s.policy.importLimits.nodes {
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value := importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the aggregate node limit", nil)
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return &value
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}
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return nil
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}
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func (s *importTraversal) walkDeclarations(basePath string, declarations []importDeclarationSpec, depth int, parentDestination Path, sourceIndex int) []Diagnostic {
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policies := make([]resolvedImportPolicy, len(declarations))
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for index, spec := range declarations {
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policy, diagnostics := resolveImportPolicy(spec, s.policy.importDefaults)
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if len(diagnostics) != 0 {
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return diagnostics
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}
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if policy.placement == placementModeSequenceItem && len(appendDestination(parentDestination, policy.destination).segments) == 0 {
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site := spec.fieldSites["placement"]
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return []Diagnostic{{Code: CodeImportInvalid, Severity: SeverityError, Path: site.path.clone(), Message: "sequence-item placement requires a nonempty destination", Primary: cloneLocation(&site.location)}}
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}
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policies[index] = policy
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}
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for index, spec := range declarations {
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policy := policies[index]
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var selection importSelection
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var diagnostics []Diagnostic
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switch spec.selector {
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case importSelectorPath:
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selection, diagnostics = selectNamedImportCandidates(s.access, basePath, spec, policy)
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case importSelectorDirectory:
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selection, diagnostics = selectDirectoryImportCandidates(s.access, basePath, spec, policy, s.policy.importLimits, s.state.accounting)
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case importSelectorGlob:
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selection, diagnostics = selectGlobImportCandidates(s.access, basePath, spec, policy, s.policy.importLimits, s.state.accounting)
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default:
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location := spec.location
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return []Diagnostic{importDiagnostic(CodeImportInvalid, "import selector is invalid", &location)}
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}
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if len(diagnostics) != 0 {
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return diagnostics
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}
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childDestination := appendDestination(parentDestination, policy.destination)
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// Count admitted records rather than lexical candidates: optional missing
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// paths are omitted during admission, and a partially present list is not empty.
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sourcesBefore := len(s.sources)
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for _, candidate := range selection.candidates {
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if diagnostics := s.visitPath(candidate, spec, policy, childDestination, policy.destination, depth+1); len(diagnostics) != 0 {
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return diagnostics
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}
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}
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if !policy.required && len(s.sources) == sourcesBefore {
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s.recordEmptyImportSelection(sourceIndex, spec)
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}
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}
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return nil
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}
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func (s *importTraversal) recordEmptyImportSelection(sourceIndex int, spec importDeclarationSpec) {
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// The declaring source's position survives descendant appends and optional
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// missing-source rollback, unlike a pointer into the source slice.
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s.sources[sourceIndex].importSelections = append(s.sources[sourceIndex].importSelections, importSelectionEvidence{
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path: spec.path.clone(), location: spec.location,
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selector: spec.selector, outcome: importSelectionNone,
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})
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}
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func (s *importTraversal) admitImportSource(canonical string, identity resourceIdentity, nodeKey importNodeKey, candidate selectedImportCandidate, policy resolvedImportPolicy, destination Path, location Location) (importAdmissionResult, []Diagnostic) {
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sourceID := "source-" + strconv.Itoa(s.state.accounting.sources+1)
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kind := SourceKindFile
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label := candidate.label
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if label == "" {
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label = candidate.path
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}
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if s.access.native != nil {
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kind = SourceKindFilesystem
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label = s.access.label + "/" + canonical
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}
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info := SourceInfo{ID: sourceID, Label: label, Path: canonical, Destination: s.sourceDestination(destination), Layer: LayerBase, Kind: kind, ImportedFrom: &location}
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if policy.placement == placementModeSequenceItem {
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info.placementMode = placementModeSequenceItem
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}
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// A source's own item placement still has an exact sequence-container
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// destination. Only an unresolved enclosing item index makes the path a
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// fallback container for this snapshot.
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info.destinationUnresolved = s.itemScope
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if kind == SourceKindFilesystem {
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info.namespace = s.access.token
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}
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sourceIndex := len(s.sources)
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s.sources = append(s.sources, info)
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data, skipped, diagnostic := s.readImport(canonical, sourceID, policy.required)
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if diagnostic != nil {
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return importAdmissionResult{}, []Diagnostic{*diagnostic}
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}
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if skipped {
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s.sources = s.sources[:len(s.sources)-1]
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return importAdmissionResult{outcome: importAdmissionOptionalMissing}, nil
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}
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s.state.accounting.sources++
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root, issues := yamladapter.Parse(bytes.NewReader(data), sourceID, yamladapter.Limits{
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Depth: maxDocumentDepth, Nodes: maxDocumentNodes,
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})
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if len(issues) != 0 {
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return importAdmissionResult{}, parserDiagnostics(sourceID, issues)
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}
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nodeCount := countInputNodes(root)
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if s.state.accounting.nodes+nodeCount > s.policy.importLimits.nodes {
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value := importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the aggregate node limit", &location)
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return importAdmissionResult{}, []Diagnostic{value}
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}
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s.state.accounting.nodes += nodeCount
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directiveContext := s.request.input.directiveContext
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if directiveContext == 0 {
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directiveContext = rootDirectiveContextImportsOnly
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}
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versionDestination := destination
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if s.itemScope {
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versionDestination = appendDestination(s.itemPrefix.Index(0), destination)
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}
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var processing sourceVersionProcessingResult
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if s.state.versionState != nil && s.state.versionState.mode != sourceVersionModeDefault {
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processed, failures := s.state.versionState.processWithDirectiveContext(root, sourceVersionContribution, versionDestination, sourceID, policy.placement, directiveContext)
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if len(failures) != 0 {
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return importAdmissionResult{}, failures
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}
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processing = processed
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} else {
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processed := processSourceVersionWithDirectiveContext(root, s.request.input.protectionRule, sourceVersionContribution, versionDestination, sourceVersionModeDefault, directiveContext)
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if len(processed.diagnostics) != 0 {
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return importAdmissionResult{}, processed.diagnostics
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}
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processing = processed
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}
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return importAdmissionResult{source: admittedImport{
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canonical: canonical, identity: identity, nodeKey: nodeKey,
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source: cloneSourceInfo(info), sourceIndex: sourceIndex, payload: processing.payload,
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declarations: processing.imports,
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sequenceDeclarations: cloneSequenceDeclarations(processing.sequences),
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processing: &processing,
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}}, nil
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}
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func (s *importTraversal) visitPath(candidate selectedImportCandidate, spec importDeclarationSpec, policy resolvedImportPolicy, destination, relativeDestination Path, depth int) []Diagnostic {
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location := candidate.site.location
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if location.SourceID == "" && location.Line == 0 && location.Column == 0 {
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location = spec.location
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}
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if !s.access.contains(candidate.accessPath) {
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return []Diagnostic{importDiagnostic(CodeImportOutsideRoot, "import target is outside the configuration root", &location)}
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}
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canonical, err := s.access.canonical(candidate.accessPath)
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if err != nil {
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if !policy.required && errors.Is(err, fs.ErrNotExist) {
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return nil
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}
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code := CodeImportInvalid
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message := "import target could not be canonicalized"
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if errors.Is(err, fs.ErrNotExist) {
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code, message = CodeImportMissing, "required import target does not exist"
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} else if errors.Is(err, fs.ErrPermission) {
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message = "import target cannot be accessed"
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}
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return []Diagnostic{importDiagnostic(code, message, &location)}
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}
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if !s.access.contains(canonical) {
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return []Diagnostic{importDiagnostic(CodeImportOutsideRoot, "import target resolves outside the configuration root", &location)}
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}
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if depth > s.policy.importLimits.depth {
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return []Diagnostic{importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the active import-depth limit", &location)}
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}
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currentRoute := s.currentRoute(location)
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identity := s.access.identity(canonical)
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nodeKey := importKeyFor(s.access, canonical, false)
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importerKey := s.currentImportNode()
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if activeIndex, ok := s.active[identity]; ok {
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closingEdge := s.importGraph.addEdge(importerKey, nodeKey, location)
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if diagnostic, ok := s.importGraph.scheduleCycle(closingEdge, location); ok {
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return []Diagnostic{diagnostic}
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}
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cycle := append([]importRoute(nil), s.stack[activeIndex:]...)
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return []Diagnostic{importCycleDiagnostic(canonical, location, cycle)}
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}
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if previous, ok := s.tier.visited[identity]; ok {
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s.importGraph.addEdge(importerKey, nodeKey, location)
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return []Diagnostic{importRepeatedDiagnostic(location, previous, currentRoute)}
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}
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if s.state.accounting.sources+1 > s.policy.importLimits.sources {
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return []Diagnostic{importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the source-count limit", &location)}
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}
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if _, err := s.access.relative(canonical); err != nil {
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return []Diagnostic{importDiagnostic(CodeImportOutsideRoot, "import target could not be addressed inside the configuration root", &location)}
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}
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admission, diagnostics := s.admitImportSource(canonical, identity, nodeKey, candidate, policy, destination, location)
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if len(diagnostics) != 0 {
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return diagnostics
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}
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if admission.outcome == importAdmissionOptionalMissing {
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return nil
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}
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admitted := admission.source
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placementDestination := destination
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mode := placementModeMapping
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if policy.placement == placementModeSequenceItem {
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mode = placementModeSequenceItem
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}
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role := importRoleMapping
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if mode == placementModeSequenceItem {
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role = importRoleItem
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}
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s.importGraph.addNode(importGraphNode{key: admitted.nodeKey, canonical: admitted.canonical, sourceID: admitted.source.ID, role: role})
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s.importGraph.addEdge(importerKey, admitted.nodeKey, location)
|
|
if mode == placementModeSequenceItem {
|
|
route := importRoute{canonical: admitted.canonical, locations: currentRoute.locations, key: admitted.nodeKey}
|
|
s.active[admitted.identity] = len(s.stack)
|
|
s.tier.visited[admitted.identity] = route
|
|
s.stack = append(s.stack, route)
|
|
diagnostics := s.visitItemSource(admitted, destination, relativeDestination, depth)
|
|
delete(s.active, admitted.identity)
|
|
s.stack = s.stack[:len(s.stack)-1]
|
|
return diagnostics
|
|
}
|
|
_, placed, err := placeDocument(admitted.payload, placementDestination, admitted.payload.Location, maxDocumentDepth, maxDocumentNodes)
|
|
if err != nil {
|
|
return []Diagnostic{importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the source depth or node limit after destination placement", &location)}
|
|
}
|
|
placementNodes := destinationWrapperNodeCount(placementDestination)
|
|
if s.state.accounting.nodes+placementNodes > s.policy.importLimits.nodes {
|
|
return []Diagnostic{importDiagnostic(CodeImportLimitExceeded, "configuration exceeds the aggregate node limit", &location)}
|
|
}
|
|
s.state.accounting.nodes += placementNodes
|
|
route := importRoute{canonical: admitted.canonical, locations: currentRoute.locations, key: admitted.nodeKey}
|
|
s.scope.contributions = append(s.scope.contributions, acquiredContribution{
|
|
source: cloneSourceInfo(admitted.source), payload: admitted.payload, document: placed,
|
|
identity: admitted.nodeKey, role: role, scopeOwner: s.scope.owner,
|
|
destination: placementDestination.clone(), relativeDestination: relativeDestination.clone(), processing: admitted.processing,
|
|
sequenceDeclarations: cloneSequenceDeclarations(admitted.sequenceDeclarations),
|
|
})
|
|
s.active[admitted.identity] = len(s.stack)
|
|
s.tier.visited[admitted.identity] = route
|
|
s.stack = append(s.stack, route)
|
|
diagnostics = s.walkDeclarations(s.access.dir(admitted.canonical), admitted.declarations, depth, destination, admitted.sourceIndex)
|
|
delete(s.active, admitted.identity)
|
|
s.stack = s.stack[:len(s.stack)-1]
|
|
return diagnostics
|
|
}
|
|
|
|
func (s *importTraversal) currentImportNode() importNodeKey {
|
|
if len(s.stack) != 0 {
|
|
return s.stack[len(s.stack)-1].key
|
|
}
|
|
key := s.scope.owner
|
|
if _, exists := s.importGraph.index[key]; !exists {
|
|
s.importGraph.addNode(importGraphNode{key: key, canonical: "<selected-source>", role: importRoleMain})
|
|
}
|
|
return key
|
|
}
|
|
|
|
func (s *importTraversal) sourceDestination(destination Path) Path {
|
|
if !s.itemScope {
|
|
return destination.clone()
|
|
}
|
|
// Until the enclosing item receives its assigned index, only the collection
|
|
// container is exact. Keep the local suffix in the acquisition projection.
|
|
return s.itemFallback.clone()
|
|
}
|
|
|
|
func (s *importTraversal) readImport(name, sourceID string, required bool) ([]byte, bool, *Diagnostic) {
|
|
remaining := s.policy.importLimits.bytes - s.state.accounting.bytes
|
|
limit := min(int64(maxSourceBytes), remaining)
|
|
if limit < 0 {
|
|
limit = 0
|
|
}
|
|
data, failure := readRegularFile(name, s.access.stat, s.access.open, limit)
|
|
if failure != nil {
|
|
if !required && failure.missingTarget {
|
|
return nil, true, nil
|
|
}
|
|
value := sourceReadDiagnostic(failure, sourceID, CodeImportLimitExceeded, "configuration exceeds a source or aggregate byte limit")
|
|
return nil, false, &value
|
|
}
|
|
s.state.accounting.bytes += int64(len(data))
|
|
return data, false, nil
|
|
}
|
|
|
|
func (s *importTraversal) currentRoute(location Location) importRoute {
|
|
locations := make([]Location, 0, len(s.stack)+1)
|
|
for _, route := range s.stack {
|
|
if len(route.locations) != 0 {
|
|
locations = append(locations, route.locations[len(route.locations)-1])
|
|
}
|
|
}
|
|
locations = append(locations, location)
|
|
return importRoute{locations: locations}
|
|
}
|