Anonymization Layer-Reputation System protocol

For the communication between the Anonymization Layer and the Reputation System a simple line based protocol is used. The Reputation System acts as a TCP server and listens on 127.0.0.1 port 4444. All commands are sent by the Anonymization Layer. All commands and responses end with a single newline ("\n" in C).

newuser n

A new user with index n has been added.
No response from the Reputation System.

feedback n m x

User n sent a feedback about user m with value x.
No response from the Reputation System.

query n m

User n wants to query the reputation of user m.

Response

y, the reputation value of m as seen by n

n and m are integers from the set $\{1,\ldots ,N\}$ (with $N$ being the last n sent in a newuser command).
x is from the set $\{-1,+1\}$
y is a real number, represented with the C format string g or G (with almost arbitrary precision).