#48673 - Added Timestamp Cache Handling to metadata.fields (#648)

* added timestamp convertion to metadata.fields

* fixed duration parsing

* fixed tests

* removed tags file

* added comments

* added better error handling

* changed ParseHumanDuration to use Fscanf

* added builtins handling

* adding mock updates

* fixing tests

* another try

* added timestamp convertion to metadata.fields

* addressing comments from @ericpromislow

* converting error to warning

* added template options

pkg/resources/common/util.go

@@ -0,0 +1,41 @@
+package common
+
+import (
+	"strconv"
+	"strings"
+
+	"github.com/rancher/apiserver/pkg/types"
+	"github.com/rancher/steve/pkg/attributes"
+)
+
+// GetIndexValueFromString looks for values between [ ].
+// e.g: $.metadata.fields[2], in this case it would return 2
+// In case it doesn't find any value between brackets it returns -1
+func GetIndexValueFromString(pathString string) int {
+	idxStart := strings.Index(pathString, "[")
+	if idxStart == -1 {
+		return -1
+	}
+	idxEnd := strings.Index(pathString[idxStart+1:], "]")
+	if idxEnd == -1 {
+		return -1
+	}
+	idx, err := strconv.Atoi(pathString[idxStart+1 : idxStart+1+idxEnd])
+	if err != nil {
+		return -1
+	}
+	return idx
+}
+
+// GetColumnDefinitions returns ColumnDefinitions from an APISchema
+func GetColumnDefinitions(schema *types.APISchema) []ColumnDefinition {
+	columns := attributes.Columns(schema)
+	if columns == nil {
+		return nil
+	}
+	colDefs, ok := columns.([]ColumnDefinition)
+	if !ok {
+		return nil
+	}
+	return colDefs
+}