mirror of https://github.com/databricks/cli.git
55 lines
1.3 KiB
Go
55 lines
1.3 KiB
Go
package schema
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import (
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"container/list"
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"fmt"
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"reflect"
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)
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type tracker struct {
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// Types encountered in current path during the recursive traversal. Used to
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// check for cycles
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seenTypes map[reflect.Type]struct{}
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// List of field names encountered in current path during the recursive traversal.
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// Used to hydrate errors with path to the exact node where error occured.
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//
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// The field names here are the first tag in the json tags of struct field.
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debugTrace *list.List
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}
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func newTracker() *tracker {
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return &tracker{
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seenTypes: map[reflect.Type]struct{}{},
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debugTrace: list.New(),
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}
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}
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func (t *tracker) errWithTrace(prefix string) error {
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traceString := "root"
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curr := t.debugTrace.Front()
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for curr != nil {
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if curr.Value.(string) != "" {
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traceString += " -> " + curr.Value.(string)
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}
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curr = curr.Next()
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}
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return fmt.Errorf("[ERROR] " + prefix + ". traversal trace: " + traceString)
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}
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func (t *tracker) hasCycle(golangType reflect.Type) bool {
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_, ok := t.seenTypes[golangType]
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return ok
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}
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func (t *tracker) push(nodeType reflect.Type, jsonName string) {
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t.seenTypes[nodeType] = struct{}{}
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t.debugTrace.PushBack(jsonName)
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}
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func (t *tracker) pop(nodeType reflect.Type) {
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back := t.debugTrace.Back()
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t.debugTrace.Remove(back)
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delete(t.seenTypes, nodeType)
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}
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