guess the number

[brenzi]

A little game for fun

1. once per week, a new round starts at 0:00 GMT
2. at the start of the round, the enclave draws a random lucky number from [0..10_000] (confidential)
3. during the week, players can guess up to 10 times
4. at the end of the round, winner(s) are rewarded

implementation notes:

• inspired by Raffle Demo #1583 I introduced a generic randomness tool using SgxRnd exposed to pallets
• Sidechain blocks now have on_initialize and on_finalize hooks we use here for OnTimestampSet
• extended the cli to accept mnemonic or hex seed instead of account in keystore as well (C&P from Encointer)
• find solution to make CI work without pre-funding Alice. or strictly divide production/test
• test multiple rounds, temporarily setting round duration to 10min
• charge fees for guessing

testing

# node
./target/release/integritee-node --dev --unsafe-rpc-external --rpc-cors all
# worker (in docker)
SGX_MODE=SW WORKER_MODE=sidechain WORKER_FEATURES=dcap make
./integritee-service -u ws://172.17.0.1 --ws-external -c run --skip-ra --dev &> worker.log

verify that a new round has started with the first produced sidechain block and a random number has been drawn

MRENCLAVE=$(./integritee-cli trusted get-shard)
VAULT=$(./integritee-cli trusted get-shard-vault)
./integritee-cli trusted --mrenclave $MRENCLAVE guess-the-number get-info
# GuessTheNumberInfo { account: 5d38b13719a9f34591ef9ced18ce03dbc45d0b9ffcba69ebcbae06464952ae41 (5EAw9k5U...), balance: 0, winnings: 0, next_round_timestamp: 1728432000000, last_winners: [], maybe_last_lucky_number: None, maybe_last_winning_distance: None }
# pot account: 5EAw9k5U5ERbUkNEmAmMWb1JigzYNrTKXfukfrWDy92gq62w

# shield 100 TEER for Alice
./integritee-cli -u ws://172.17.0.1 transfer //Alice $VAULT 111000000000000
./integritee-cli trusted --mrenclave $MRENCLAVE balance //Alice

# fill the pot with 33 TEER
./integritee-cli trusted --mrenclave $MRENCLAVE --direct transfer //Alice 5EAw9k5U5ERbUkNEmAmMWb1JigzYNrTKXfukfrWDy92gq62w 33000000000000
# verify with public getter:
./integritee-cli trusted --mrenclave $MRENCLAVE guess-the-number get-info
# balance should be 33000000000000

# set winning amount to 22 TEER as GameMaster (5FRMoVZyb7X32tvzdPxtbYhTjb4y7e7ynWdt8AArJsqr7xBn)
./integritee-cli trusted --mrenclave $MRENCLAVE --direct guess-the-number set-winnings "<mnemonic>" 22000000000000

# verify with public getter:
./integritee-cli trusted --mrenclave $MRENCLAVE guess-the-number get-info
# winnings should be 22000000000000

# now guess
./integritee-cli trusted --mrenclave $MRENCLAVE --direct guess-the-number guess //Alice 42

# try several times. 10x should work (status: `InSidechainBlock`). the eleventh time should fail (status: `Invalid`)

[clangenb]

Looks good to me, only a few minor remarks!