127 lines
3.7 KiB
Go
127 lines
3.7 KiB
Go
package engine
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import "reflect"
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type projectionLimits struct {
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depth int
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nodes int
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}
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func defaultProjectionLimits() projectionLimits {
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return projectionLimits{depth: maxDocumentDepth, nodes: maxDocumentNodes}
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}
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type projectionIssue struct {
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code Code
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path Path
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message string
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}
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type valueVisit struct {
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typeOf reflect.Type
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kind reflect.Kind
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ptr uintptr
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}
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// valueOperation owns one traversal's cycle and budget state and reuses the
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// current load's descriptor cache for dynamic values.
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type valueOperation struct {
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cloneMode secretCloneMode
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schema *schemaDescriptor
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limits projectionLimits
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active map[valueVisit]bool
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nodes int
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}
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func (o *valueOperation) dynamicDescriptor(current reflect.Type, path Path) (*typeDescriptor, *projectionIssue) {
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if o.schema.secrets.Type != nil && current == o.schema.secrets.Type {
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return nil, &projectionIssue{code: CodeSchemaDynamicType, path: path.clone(), message: "dynamic configuration values cannot establish secret-reference semantics"}
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}
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builder := schemaBuilder{cache: o.schema.types, building: make(map[reflect.Type]bool), secrets: o.schema.secrets}
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descriptor, issue := builder.describe(current, path)
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if issue != nil {
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return nil, &projectionIssue{code: CodeSchemaDynamicType, path: path.clone(), message: "dynamic configuration value has an unsupported type"}
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}
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if descriptorContainsSecret(descriptor, make(map[*typeDescriptor]bool)) {
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return nil, &projectionIssue{code: CodeSchemaDynamicType, path: path.clone(), message: "dynamic configuration values cannot establish secret-reference semantics"}
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}
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return descriptor, nil
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}
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func descriptorContainsSecret(descriptor *typeDescriptor, visited map[*typeDescriptor]bool) bool {
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if descriptor == nil || visited[descriptor] {
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return false
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}
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if descriptor.kind == descriptorSecret {
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return true
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}
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visited[descriptor] = true
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if descriptorContainsSecret(descriptor.element, visited) {
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return true
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}
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for _, member := range descriptor.members {
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if descriptorContainsSecret(member.descriptor, visited) {
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return true
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}
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}
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return false
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}
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func (o *valueOperation) charge(path Path) *projectionIssue {
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o.nodes++
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if o.limits.nodes >= 0 && o.nodes > o.limits.nodes {
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return &projectionIssue{code: CodeSchemaProjectionLimit, path: path.clone(), message: "configuration projection exceeds the node limit"}
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}
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return nil
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}
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func (o *valueOperation) checkDepth(path Path, depth int) *projectionIssue {
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if depth > o.limits.depth {
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return &projectionIssue{code: CodeSchemaProjectionLimit, path: path.clone(), message: "configuration projection exceeds the depth limit"}
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}
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return nil
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}
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func (o *valueOperation) enter(value reflect.Value, path Path) (func(), *projectionIssue) {
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visit, ok := visitFor(value)
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if !ok {
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return func() {}, nil
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}
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if o.active[visit] {
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return nil, &projectionIssue{code: CodeSchemaCycle, path: path.clone(), message: "configuration values must not contain cycles"}
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}
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o.active[visit] = true
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return func() { delete(o.active, visit) }, nil
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}
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func visitFor(value reflect.Value) (valueVisit, bool) {
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if isNilValue(value) {
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return valueVisit{}, false
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}
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visit := valueVisit{typeOf: value.Type(), kind: value.Kind()}
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switch value.Kind() {
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case reflect.Pointer, reflect.Slice:
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if value.Kind() == reflect.Slice && value.Len() == 0 {
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return valueVisit{}, false
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}
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visit.ptr = value.Pointer()
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case reflect.Map:
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if value.Len() == 0 {
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return valueVisit{}, false
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}
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visit.ptr = uintptr(value.UnsafePointer())
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default:
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return valueVisit{}, false
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}
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return visit, visit.ptr != 0
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}
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func isNilValue(value reflect.Value) bool {
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switch value.Kind() {
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case reflect.Chan, reflect.Func, reflect.Interface, reflect.Map, reflect.Pointer, reflect.Slice:
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return value.IsNil()
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default:
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return false
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}
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}
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