parallelize account loading and saving (#273)

- parallelize account loading
- parallelize account saving

Cargo.lock

@@ -3078,6 +3078,7 @@ dependencies = [
  "proptest",
  "qrcode",
  "rand 0.8.5",
+ "rayon",
  "regex",
  "reqwest",
  "rpassword",

Cargo.toml

@@ -67,6 +67,7 @@ keyring = { version = "2.0.4", optional = true }
 argon2 = { version = "0.5.0", features = ["std"] }
 pbkdf2 = { version = "0.12.1", features = ["parallel"] }
 sha1 = "0.10.5"
+rayon = "1.7.0"
 
 [dev-dependencies]
 tempdir = "0.3"

src/accountmanager.rs

@@ -2,6 +2,7 @@ use crate::accountmanager::legacy::SdaManifest;
 pub use crate::encryption::EncryptionScheme;
 use crate::encryption::EntryEncryptor;
 use log::*;
+use rayon::prelude::*;
 use secrecy::{ExposeSecret, SecretString};
 use std::collections::HashMap;
 use std::fs::File;
@@ -102,13 +103,14 @@ impl AccountManager {
 
 	/// Loads all accounts, and registers them.
 	pub fn load_accounts(&mut self) -> anyhow::Result<(), ManifestAccountLoadError> {
-		let mut accounts = vec![];
-		for entry in &self.manifest.entries {
-			let account = self.load_account_by_entry(entry)?;
-			accounts.push(account);
-		}
+		let accounts = self
+			.manifest
+			.entries
+			.par_iter()
+			.map(|entry| self.load_account_by_entry(entry))
+			.collect::<Vec<_>>();
 		for account in accounts {
-			self.register_loaded_account(account);
+			self.register_loaded_account(account?);
 		}
 		Ok(())
 	}
@@ -198,14 +200,15 @@ impl AccountManager {
 	/// Saves the manifest and all loaded accounts.
 	pub fn save(&self) -> anyhow::Result<()> {
 		info!("Saving manifest and accounts...");
-		for account in self
+		let save_results: Vec<_> = self
 			.accounts
 			.values()
-			.map(|a| a.clone().lock().unwrap().clone())
-		{
+			.par_bridge()
+			.map(|account| -> anyhow::Result<()> {
+				let account = account.lock().unwrap();
 				let entry = self.get_entry(&account.account_name)?.clone();
 				debug!("saving {}", entry.filename);
-			let serialized = serde_json::to_vec(&account)?;
+				let serialized = serde_json::to_vec(&account.clone())?;
 				ensure!(
 					serialized.len() > 2,
 					"Something extra weird happened and the account was serialized into nothing."
@@ -225,6 +228,12 @@ impl AccountManager {
 				let mut file = File::create(path)?;
 				file.write_all(final_buffer.as_slice())?;
 				file.sync_data()?;
+
+				Ok(())
+			})
+			.collect();
+		for result in save_results {
+			result?;
 		}
 		debug!("saving manifest");
 		let manifest_serialized = serde_json::to_string(&self.manifest)?;