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Provide fallback for usd-per-eth option when offline.

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Fixes #1073.
This commit is contained in:
Gav Wood 2016-05-14 14:53:46 +01:00
parent 354ac7d6e5
commit 33248528b9
2 changed files with 10 additions and 1 deletions
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4
parity/cli.rs
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@ -102,7 +102,9 @@ Sealing/Mining Options:
[default: 0.005]. The minimum gas price is set
accordingly.
--usd-per-eth SOURCE USD value of a single ETH. SOURCE may be either an
amount in USD or a web service [default: etherscan].
amount in USD, a web service or 'auto' to use each
web service in turn and fallback on the last known
good value [default: auto].
--gas-floor-target GAS Amount of gas per block to target when sealing a new
block [default: 4712388].
--author ADDRESS Specify the block author (aka "coinbase") address

7
parity/configuration.rs
View File

@ -91,11 +91,18 @@ impl Configuration {
die!("{}: Invalid basic transaction price given in USD. Must be a decimal number.", self.args.flag_usd_per_tx)
});
let usd_per_eth = match self.args.flag_usd_per_eth.as_str() {
"auto" => PriceInfo::get().map_or_else(|| {
let last_known_good = 9.69696;
// TODO: use #1083 to read last known good value.
last_known_good
}, |x| x.ethusd),
"etherscan" => PriceInfo::get().map_or_else(|| {
die!("Unable to retrieve USD value of ETH from etherscan. Rerun with a different value for --usd-per-eth.")
}, |x| x.ethusd),
x => FromStr::from_str(x).unwrap_or_else(|_| die!("{}: Invalid ether price given in USD. Must be a decimal number.", x))
};
// TODO: use #1083 to write last known good value as use_per_eth.
let wei_per_usd: f32 = 1.0e18 / usd_per_eth;
let gas_per_tx: f32 = 21000.0;
let wei_per_gas: f32 = wei_per_usd * usd_per_tx / gas_per_tx;