gas_price() estimate function may not return expected value for multi-native token

[qizhou]

pyquarkchain/quarkchain/cluster/shard_state.py

Line 1777 in d470e13

def gas_price(self, token_id: int) -> Optional[int]:

The current estimation will estimate based on the historical gas price of the same token id, which may be empty or small if the token id is not frequently used. A better way may still estimate the price for QKC first and then convert to the price for token id.

Further, returning MIN_TX_POOL_GAS_PRICE for other token ids other than QKC may be wrong.

[qizhou]

We may also need to add a jsonrpc that accepts:

• chain id
• token id
• gas price
  and outputs
• gas price in QKC

[ninjaahhh]

lower the priority since it's not consensus-critical.