staking-miner: remove need of a file to pass the seed

.gitignore

@@ -11,3 +11,4 @@ polkadot.*
 !.rpm/*
 .DS_Store
 .cargo
+.env

utils/staking-miner/src/dry_run.rs

@@ -61,7 +61,7 @@ async fn print_info<T: EPM::Config>(
 
 		let snapshot_size =
 			<EPM::Pallet<T>>::snapshot_metadata().expect("snapshot must exist by now; qed.");
-		let deposit = EPM::Pallet::<T>::deposit_for(&raw_solution, snapshot_size);
+		let deposit = EPM::Pallet::<T>::deposit_for(raw_solution, snapshot_size);
 		log::info!(
 			target: LOG_TARGET,
 			"solution score {:?} / deposit {:?} / length {:?}",
@@ -80,7 +80,9 @@ async fn print_info<T: EPM::Config>(
 	log::info!(
 		target: LOG_TARGET,
 		"payment_queryInfo: (fee = {}) {:?}",
-		info.as_ref().map(|d| Token::from(d.partial_fee)).unwrap_or(Token::from(0)),
+		info.as_ref()
+			.map(|d| Token::from(d.partial_fee))
+			.unwrap_or_else(|_| Token::from(0)),
 		info,
 	);
 }

utils/staking-miner/src/main.rs

@@ -276,15 +276,15 @@ struct DryRunConfig {
 #[derive(Debug, Clone, StructOpt)]
 struct SharedConfig {
 	/// The `ws` node to connect to.
-	#[structopt(long, short, default_value = DEFAULT_URI)]
+	#[structopt(long, short, default_value = DEFAULT_URI, env = "URI")]
 	uri: String,
 
-	/// The file from which we read the account seed.
+	/// The seed of a funded account in hex.
 	///
-	/// WARNING: don't use an account with a large stash for this. Based on how the bot is
-	/// configured, it might re-try lose funds through transaction fees/deposits.
-	#[structopt(long, short)]
-	account_seed: std::path::PathBuf,
+	/// WARNING: Don't use an account with a large stash for this. Based on how the bot is
+	/// configured, it might re-try and lose funds through transaction fees/deposits.
+	#[structopt(long, short, env = "SEED")]
+	seed: String,
 }
 
 #[derive(Debug, Clone, StructOpt)]
@@ -354,7 +354,7 @@ fn mine_dpos<T: EPM::Config>(ext: &mut Ext) -> Result<(), Error> {
 		let desired_targets = EPM::DesiredTargets::<T>::get().unwrap();
 		let mut candidates_and_backing = BTreeMap::<T::AccountId, u128>::new();
 		voters.into_iter().for_each(|(who, stake, targets)| {
-			if targets.len() == 0 {
+			if targets.is_empty() {
 				println!("target = {:?}", (who, stake, targets));
 				return
 			}
@@ -491,7 +491,7 @@ async fn main() {
 	};
 
 	let signer_account = any_runtime! {
-		signer::read_signer_uri::<_, Runtime>(&shared.account_seed, &client)
+		signer::signer_uri_from_string::<Runtime>(&shared.seed, &client)
 			.await
 			.expect("Provided account is invalid, terminating.")
 	};

utils/staking-miner/src/prelude.rs

@@ -34,9 +34,9 @@ pub type Hash = core_primitives::Hash;
 pub use sp_runtime::traits::{Block as BlockT, Header as HeaderT};
 
 /// Default URI to connect to.
-pub const DEFAULT_URI: &'static str = "wss://rpc.polkadot.io";
+pub const DEFAULT_URI: &str = "wss://rpc.polkadot.io";
 /// The logging target.
-pub const LOG_TARGET: &'static str = "staking-miner";
+pub const LOG_TARGET: &str = "staking-miner";
 
 /// The election provider pallet.
 pub use pallet_election_provider_multi_phase as EPM;

utils/staking-miner/src/rpc_helpers.rs

@@ -82,7 +82,7 @@ where
 	Hash: serde::Serialize,
 {
 	let key = <V as StorageValue<T>>::hashed_key();
-	get_storage::<V::Query>(&client, params! { key, maybe_at }).await
+	get_storage::<V::Query>(client, params! { key, maybe_at }).await
 }
 
 #[allow(unused)]
@@ -103,5 +103,5 @@ where
 	Hash: serde::Serialize,
 {
 	let key = <M as StorageMap<K, T>>::hashed_key_for(key);
-	get_storage::<M::Query>(&client, params! { key, maybe_at }).await
+	get_storage::<M::Query>(client, params! { key, maybe_at }).await
 }

utils/staking-miner/src/signer.rs

@@ -18,9 +18,8 @@
 
 use crate::{prelude::*, rpc_helpers, AccountId, Error, Index, Pair, WsClient, LOG_TARGET};
 use sp_core::crypto::Pair as _;
-use std::path::Path;
 
-pub(crate) const SIGNER_ACCOUNT_WILL_EXIST: &'static str =
+pub(crate) const SIGNER_ACCOUNT_WILL_EXIST: &str =
 	"signer account is checked to exist upon startup; it can only die if it transfers funds out \
 	 of it, or get slashed. If it does not exist at this point, it is likely due to a bug, or the \
 	 signer got slashed. Terminating.";
@@ -30,10 +29,9 @@ pub(crate) const SIGNER_ACCOUNT_WILL_EXIST: &'static str =
 pub(crate) struct Signer {
 	/// The account id.
 	pub(crate) account: AccountId,
+
 	/// The full crypto key-pair.
 	pub(crate) pair: Pair,
-	/// The raw URI read from file.
-	pub(crate) uri: String,
 }
 
 pub(crate) async fn get_account_info<T: frame_system::Config>(
@@ -51,26 +49,22 @@ pub(crate) async fn get_account_info<T: frame_system::Config>(
 	.await
 }
 
-/// Read the signer account's URI from the given `path`.
-pub(crate) async fn read_signer_uri<
-	P: AsRef<Path>,
+/// Read the signer account's URI
+pub(crate) async fn signer_uri_from_string<
 	T: frame_system::Config<
 		AccountId = AccountId,
 		Index = Index,
 		AccountData = pallet_balances::AccountData<Balance>,
 	>,
 >(
-	path: P,
+	seed: &str,
 	client: &WsClient,
 ) -> Result<Signer, Error> {
-	let uri = std::fs::read_to_string(path)?;
-
-	// trim any trailing garbage.
-	let uri = uri.trim_end();
+	let seed = seed.trim();
 
-	let pair = Pair::from_string(&uri, None)?;
+	let pair = Pair::from_string(seed, None)?;
 	let account = T::AccountId::from(pair.public());
-	let _info = get_account_info::<T>(&client, &account, None)
+	let _info = get_account_info::<T>(client, &account, None)
 		.await?
 		.ok_or(Error::AccountDoesNotExists)?;
 	log::info!(
@@ -80,5 +74,5 @@ pub(crate) async fn read_signer_uri<
 		Token::from(_info.data.free),
 		_info
 	);
-	Ok(Signer { account, pair, uri: uri.to_string() })
+	Ok(Signer { account, pair })
 }