| Zsolt Haraszti | dafefe1 | 2016-11-14 21:29:58 -0800 | [diff] [blame] | 1 | """ |
| 2 | Monkey patched json_format to allow best effort decoding of Any fields. |
| 3 | Use the additional flag (strict_any_handling=False) to trigger the |
| 4 | best-effort behavior. Omit the flag, or just use the original json_format |
| 5 | module fot the strict behavior. |
| 6 | """ |
| 7 | |
| 8 | from google.protobuf import json_format |
| 9 | |
| 10 | class _PatchedPrinter(json_format._Printer): |
| 11 | |
| 12 | def __init__(self, including_default_value_fields=False, |
| 13 | preserving_proto_field_name=False, |
| 14 | strict_any_handling=False): |
| 15 | super(_PatchedPrinter, self).__init__(including_default_value_fields, |
| 16 | preserving_proto_field_name) |
| 17 | self.strict_any_handling = strict_any_handling |
| 18 | |
| 19 | def _BestEffortAnyMessageToJsonObject(self, msg): |
| 20 | try: |
| 21 | res = self._AnyMessageToJsonObject(msg) |
| 22 | except TypeError: |
| 23 | res = self._RegularMessageToJsonObject(msg, {}) |
| 24 | return res |
| 25 | |
| 26 | |
| 27 | def MessageToDict(message, |
| 28 | including_default_value_fields=False, |
| 29 | preserving_proto_field_name=False, |
| 30 | strict_any_handling=False): |
| 31 | """Converts protobuf message to a JSON dictionary. |
| 32 | |
| 33 | Args: |
| 34 | message: The protocol buffers message instance to serialize. |
| 35 | including_default_value_fields: If True, singular primitive fields, |
| 36 | repeated fields, and map fields will always be serialized. If |
| 37 | False, only serialize non-empty fields. Singular message fields |
| 38 | and oneof fields are not affected by this option. |
| 39 | preserving_proto_field_name: If True, use the original proto field |
| 40 | names as defined in the .proto file. If False, convert the field |
| 41 | names to lowerCamelCase. |
| 42 | strict_any_handling: If True, converion will error out (like in the |
| 43 | original method) if an Any field with value for which the Any type |
| 44 | is not loaded is encountered. If False, the conversion will leave |
| 45 | the field un-packed, but otherwise will continue. |
| 46 | |
| 47 | Returns: |
| 48 | A dict representation of the JSON formatted protocol buffer message. |
| 49 | """ |
| 50 | printer = _PatchedPrinter(including_default_value_fields, |
| 51 | preserving_proto_field_name, |
| 52 | strict_any_handling=strict_any_handling) |
| 53 | # pylint: disable=protected-access |
| 54 | return printer._MessageToJsonObject(message) |
| 55 | |
| 56 | |
| 57 | def MessageToJson(message, |
| 58 | including_default_value_fields=False, |
| 59 | preserving_proto_field_name=False, |
| 60 | strict_any_handling=False): |
| 61 | """Converts protobuf message to JSON format. |
| 62 | |
| 63 | Args: |
| 64 | message: The protocol buffers message instance to serialize. |
| 65 | including_default_value_fields: If True, singular primitive fields, |
| 66 | repeated fields, and map fields will always be serialized. If |
| 67 | False, only serialize non-empty fields. Singular message fields |
| 68 | and oneof fields are not affected by this option. |
| 69 | preserving_proto_field_name: If True, use the original proto field |
| 70 | names as defined in the .proto file. If False, convert the field |
| 71 | names to lowerCamelCase. |
| 72 | strict_any_handling: If True, converion will error out (like in the |
| 73 | original method) if an Any field with value for which the Any type |
| 74 | is not loaded is encountered. If False, the conversion will leave |
| 75 | the field un-packed, but otherwise will continue. |
| 76 | |
| 77 | Returns: |
| 78 | A string containing the JSON formatted protocol buffer message. |
| 79 | """ |
| 80 | printer = _PatchedPrinter(including_default_value_fields, |
| 81 | preserving_proto_field_name, |
| 82 | strict_any_handling=strict_any_handling) |
| 83 | return printer.ToJsonString(message) |
| 84 | |
| 85 | |
| 86 | json_format._WKTJSONMETHODS['google.protobuf.Any'] = [ |
| 87 | '_BestEffortAnyMessageToJsonObject', |
| 88 | '_ConvertAnyMessage' |
| 89 | ] |
| 90 | |
| 91 | json_format._Printer._BestEffortAnyMessageToJsonObject = \ |
| 92 | json_format._Printer._AnyMessageToJsonObject |