eth: add GasPriceOracle

[zsfelfoldi]

No description provided.

[obscuren]

This needs to be moved to its own separate function. We want to limit the amount of database gets and RLP decoding required to get a block. Most cases when GetBlock is called you don't require the receipts.

Move this to an additional method like

func (cm *ChainManager) GetReceipts(block *types.Block) types.Receipts {
    // your code
}

[tgerring]

@zsfelfoldi If it's not too much effort, can you add a method to XEth to access the receipts? This would be to support #1042

[obscuren]

@zsfelfoldi @tgerring as per my question on gitter. Separate the transaction receipt storing in a new PR

[zsfelfoldi]

@tgerring Ok, I'll do that later today or tomorrow morning.

[zsfelfoldi]

#1049

[obscuren]

Mining just empty blocks:

11062348998802'
> I0611 00:23:29.796654   84753 chain_manager.go:686] imported 4 block(s) (0 queued 0 ignored) in 8.59473ms. #80 [a6a89a15 / cafa7387]
I0611 00:23:29.797283   84753 worker.go:413] commit new work on block 81 with 0 txs & 1 uncles
> eth.gasPrice
'10957699177273'
> I0611 00:23:30.982363   84753 chain_manager.go:686] imported 1 block(s) (0 queued 0 ignored) in 10.982954ms. #81 [eaf58cd0 / eaf58cd0]
I0611 00:23:30.982507   84753 worker.go:256] 🔨  Mined block (#81 / eaf58cd0). Wait 5 blocks for confirmation
I0611 00:23:30.983298   84753 worker.go:413] commit new work on block 82 with 0 txs & 2 uncles
I0611 00:23:32.064667   84753 chain_manager.go:686] imported 1 block(s) (0 queued 0 ignored) in 14.537861ms. #82 [510b1350 / 510b1350]
I0611 00:23:32.065081   84753 worker.go:256] 🔨  Mined block (#82 / 510b1350). Wait 5 blocks for confirmation
I0611 00:23:32.065972   84753 worker.go:413] commit new work on block 83 with 0 txs & 0 uncles
> eth.gasPriceI0611 00:23:32.350849   84753 chain_manager.go:686] imported 1 block(s) (0 queued 0 ignored) in 5.931852ms. #83 [62056c3b / 62056c3b]
I0611 00:23:32.351061   84753 worker.go:256] 🔨  Mined block (#83 / 62056c3b). Wait 5 blocks for confirmation
I0611 00:23:32.351897   84753 worker.go:413] commit new work on block 84 with 0 txs & 0 uncles

'11845227651911'
> I0611 00:23:33.381041   84753 chain_manager.go:686] imported 1 block(s) (0 queued 0 ignored) in 5.865722ms. #84 [c78e753f / c78e753f]
I0611 00:23:33.381149   84753 worker.go:256] 🔨  Mined block (#84 / c78e753f). Wait 5 blocks for confirmation
I0611 00:23:33.382113   84753 worker.go:413] commit new work on block 85 with 0 txs & 0 uncles
> eth.gasPrice
'11734000964259'

Shouldn't it dip below 1000...00 ?

[zsfelfoldi]

I think it shouldn't (that's the absolute minimum value), see gitter private channel.