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Pancake Lottery Scheduler

Description

The scheduler is composed of multiple scripts used to call startLottery, closeLottery, and drawFinalNumberAndMakeLotteryClaimable functions, trigger events; and monitor lottery results.

Configuration

  • Lottery Address of PancakeSwapLottery contract.
  • Ticket Ticket Price (denominated in USD) and Precision.
  • Discount Divisor to compute discount magnitude for bulk ticket purchase.
  • Rewards Reward breakdown per bracket (total must be equal to 10,000).
  • Treasury Fee (denominated as percentage) to 2 decimals (e.g. 100 => 1%).

Configuration can be overwritten by editing config.ts file.

Deployment

# Export operator private key to be used on Hardhat Network Config.
$ export OPERATOR_PRIVATE_KEY=OPERATOR_PRIVATE_KEY

$ yarn execute:[command]:[network]

Command(s)

  • start Start a new lottery; for a given network.
  • close Close a lottery, based on currentLotteryId; for a given network.
  • draw Draw winning numbers, based on currentLotteryId; for a given network.

Network(s)

Execution

# Close lottery.
0 0,12 * * * cd ~/pancake-lottery-scheduler && yarn execute:close:mainnet

# Draw lottery.
3 0,12 * * * cd ~/pancake-lottery-scheduler && yarn execute:draw:mainnet

# Start lottery.
5 0,12 * * * cd ~/pancake-lottery-scheduler && yarn execute:start:mainnet

Logging

Logs will be generated at logs/lottery-YYYY-MM-DD.log and will be archived (.gz) with a daily rotation.

Examples of success logs:

{"message":"[1970-01-01T06:05:00.000Z] network=testnet block=10000000 message='Started lottery' hash=0x... signer=0x...","level":"info"}
{"message":"[1970-01-01T18:00:00.000Z] network=testnet block=10010010 message='Closed lottery #123' hash=0x... signer=0x...","level":"info"}
{"message":"[1970-01-01T18:03:00.000Z] network=testnet block=10100100 message='Drawed lottery #123' hash=0x... signer=0x...","level":"info"}
{"message":"[1970-01-01T18:05:00.000Z] network=testnet block=11001000 message='Started lottery' hash=0x... signer=0x...","level":"info"}

Examples of error logs:

{"message":"[1970-01-01T00:00:00.000Z] network=testnet message='Unsupported network' signer=0x...","level":"error"}
{"message":"[1970-01-01T12:00:00.000Z] network=testnet message='Invalid JSON RPC response' signer=0x...","level":"error"}
{"message":"[1970-01-02T00:00:00.000Z] network=testnet message='Invalid keyHash on RandomGenerator contract' signer=0x...","level":"error"}