Add RPC methods for CIP 1559

[wanliqun]

This change is 

[wanliqun]

eSpace debug RPC methods are not supported due to web3go sdk is not ready yet.

[boqiu]

Reviewed 5 of 5 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @wanliqun)

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rpc/cfx_api.go line 474 at r1 (raw file):

) (feeHistory *types.FeeHistory, err error) {
	cfx := GetCfxClientFromContext(ctx)
	return cfx.GetFeeHistory(blockCount, lastEpoch, rewardPercentiles)

Any limitations for the length of rewardPercentiles?

[wanliqun]

rpc/cfx_api.go line 474 at r1 (raw file):

Previously, boqiu (Bo QIU) wrote…

Any limitations for the length of rewardPercentiles?

This argument is optional, which means we can pass an empty array. Also there is no max limit per to existing Ethereum RPC specification.

[boqiu]

Reviewed 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @wanliqun)

[wanliqun]

rpc/cfx_api.go line 474 at r1 (raw file):

Previously, wanliqun (Liqun) wrote…

This argument is optional, which means we can pass an empty array. Also there is no max limit per to existing Ethereum RPC specification.

Enforce a hard limit for rewardPercentitles length to be 50.