// lockKeys unmarshals an arbitrary object into a list of lists of
// objects, flattening tuples into lists, or fails.
func lockKeys(obj interface{}) ([][]interface{}, bool) {
list, ok := cborrpc.Detuplify(obj)
if !ok {
return nil, ok
}
list2 := make([][]interface{}, len(list))
for i, item := range list {
item2, ok := cborrpc.Detuplify(item)
if !ok {
return nil, ok
}
list2[i] = item2
}
return list2, ok
}
// ExtractAddWorkUnitItem converts an arbitrary object (which really
// should be a cborpc.PythonTuple or a list) into an AddWorkUnitItem.
func ExtractAddWorkUnitItem(obj interface{}) (result AddWorkUnitItem, err error) {
var (
decoder *mapstructure.Decoder
haveMetadata bool
havePriority bool
kvpList []interface{}
kvpMap map[string]interface{}
str string
bstr []byte
ok bool
)
// If we got handed a string (or a byte string) turn it into
// a work unit with no data
if str, ok = obj.(string); ok {
result.Key = str
result.Data = make(map[string]interface{})
return
}
if bstr, ok = obj.([]byte); ok {
result.Key = string(bstr)
result.Data = make(map[string]interface{})
return
}
// Otherwise obj must be a tuple (or a list)
if kvpList, ok = cborrpc.Detuplify(obj); !ok {
err = ErrWorkUnitNotList
return
}
// Turn that list into a string-keyed map
if len(kvpList) < 2 {
err = ErrWorkUnitTooShort
return
}
kvpMap = make(map[string]interface{})
kvpMap["key"] = kvpList[0]
kvpMap["data"] = kvpList[1]
if len(kvpList) >= 3 && kvpList[2] != nil {
kvpMap["metadata"] = kvpList[2]
haveMetadata = true
}
if len(kvpList) >= 4 && kvpList[3] != nil {
kvpMap["priority"] = kvpList[3]
havePriority = true
}
// Now we can invoke mapstructure
config := mapstructure.DecoderConfig{
DecodeHook: cborrpc.DecodeBytesAsString,
Result: &result,
}
decoder, err = mapstructure.NewDecoder(&config)
if err == nil {
err = decoder.Decode(kvpMap)
}
if err == nil && haveMetadata && !havePriority {
// See if the caller passed metadata["priority"]
// instead of an explicit priority field.
if priority, ok := result.Metadata["priority"]; ok {
if result.Priority, ok = priority.(float64); !ok {
err = ErrBadPriority
}
}
}
return
}