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MRPC Messages

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Alex Sherman edited this page Aug 31, 2016 · 1 revision

Messages in MRPC refers to the JSON object that ultimately gets string encoded and sent in a UDP packet. These messages get generated when an RPC request is made, and also when the remote node is replying with a response.

There three fields that all messages must contain in order to be a valid MRPC message.

  • id
    • Incremented integer uniquely identifying a message sent from a specific node
  • src
    • 32 character hex UUID of the sending node
  • dst
    • Path for the destination of message

Request

When invoking an RPC call, a request message is generated containing the required message fields, and optionally some others. All extra fields in a request are optional, so a message containing only the required message fields is also a valid request.

  • value
    • Represents the value with which to call the remote procedure, can be any type

Response

Nodes will typically respond to RPC requests by sending a response message. Response messages are required to have exactly one of the following two fields.

  • result
    • Represents the return value of the RPC, can be any type
  • error
    • Represents an error encountered during the RPC call, typically a string message

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