Proto: cannot parse invalid wire-format data

Explanation:

The error message “proto: cannot parse invalid wire-format data” typically occurs when there is an issue with parsing or decoding wire-format data in a protocol buffer message. Protobuf is a language-agnostic binary serialization format developed by Google.

To understand the error better, let’s break down the message:

• proto: refers to the protocol buffer library or code responsible for parsing the data.
• cannot parse indicates that the library encountered an issue while trying to convert the binary data into a protocol buffer message.
• invalid wire-format data suggests that the binary data does not adhere to the expected wire-format rules defined by the protocol buffer specification.

In order to fix this error, you’ll need to identify the source of the invalid data. Common causes can include:

1. Attempting to parse data that was not serialized using the same protocol buffer schema or version.
2. Data corruption during transmission or storage.
3. Incompatible changes made to the protocol buffer schema without properly upgrading all consumers and producers of the data.

To illustrate with an example, consider a scenario where you have a protocol buffer message defined as follows:

    message MyMessage {
  int32 id = 1;
  string name = 2;
}
  

If you attempt to parse the following binary data using the above schema:

    0A 03 31 32 33 0A 04 4A 6F 68 6E
  

The data consists of two fields:

1. Field 1 (Tag: 1, Type: Varint): 0A (field number) 03 (value length) 31 32 33 (value)
2. Field 2 (Tag: 2, Type: Length-delimited): 0A (field number) 04 (value length) 4A 6F 68 6E (value)

However, if you attempt to parse this data using a different schema or version, or if the data is corrupted or serialized incorrectly, you may encounter the “proto: cannot parse invalid wire-format data” error.