InitServerDownStream (for Internal Use Only)

stream Ack

message MessageHeader {

string uuid = 1;

string mtype = 2;

bool sync = 3;

Position src = 4;

Position dst = 5;

int64 createTime = 6;

}

message Message {

MessageHeader header = 1;

string body = 2;

}

uuid: message UUID

mtype: message type

sync: whether to send messages synchronously

src: message source

dst: message destination

createTime: message creation timestamp

header: message header

body: message body

stream Message

message Ack {

string uuid = 1;

uint32 code = 2;

Position src = 3;

}

uuid: consistent with Message.uuid

code: return code

• 0: message sent successfully
• Other values: failed to send a message

src: role location