mirror of https://github.com/databricks/cli.git
56 lines
1.2 KiB
Go
56 lines
1.2 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 path of reaching the current type. Used to deletect
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// cycles
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seenTypes map[reflect.Type]struct{}
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// List of names from json tag encountered while reaching current type. This
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// is logged on any error so we know on which type an error occured
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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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if !ok {
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fmt.Println("[DEBUG] traceSet for cycle: ", t.seenTypes)
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}
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return ok
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}
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func (t *tracker) step(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) undoStep(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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