Fix naming of validators in CLI (#1332)

## Issue Addressed

NA

## Proposed Changes

- Adds a `lighthouse account validator list` command, to list all known validators.
- Fixes the validator names; previously they were using a full path (e.g., `"/home/paul/.lighthouse/validators/0x8ce25415d078bdc83133758604578ba51707a55965eeca8982f44695db7432d6ff1c23529020a971faa68ab60baf3118"` but now we only use the final directory name (e.g., `0x8ce25415d078bdc83133758604578ba51707a55965eeca8982f44695db7432d6ff1c23529020a971faa68ab60baf3118`).

account_manager/src/validator/list.rs

@@ -0,0 +1,30 @@
+use crate::VALIDATOR_DIR_FLAG;
+use clap::{App, ArgMatches};
+use std::path::PathBuf;
+use validator_dir::Manager as ValidatorManager;
+
+pub const CMD: &str = "list";
+
+pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
+    App::new(CMD).about("Lists the names of all validators.")
+}
+
+pub fn cli_run(matches: &ArgMatches<'_>) -> Result<(), String> {
+    let data_dir = clap_utils::parse_path_with_default_in_home_dir(
+        matches,
+        VALIDATOR_DIR_FLAG,
+        PathBuf::new().join(".lighthouse").join("validators"),
+    )?;
+
+    let mgr = ValidatorManager::open(&data_dir)
+        .map_err(|e| format!("Unable to read --{}: {:?}", VALIDATOR_DIR_FLAG, e))?;
+
+    for (name, _path) in mgr
+        .directory_names()
+        .map_err(|e| format!("Unable to list wallets: {:?}", e))?
+    {
+        println!("{}", name)
+    }
+
+    Ok(())
+}

account_manager/src/validator/mod.rs

@@ -1,5 +1,6 @@
 pub mod create;
 pub mod deposit;
+pub mod list;
 
 use crate::common::base_wallet_dir;
 use clap::{App, Arg, ArgMatches};
@@ -20,6 +21,7 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
         )
         .subcommand(create::cli_app())
         .subcommand(deposit::cli_app())
+        .subcommand(list::cli_app())
 }
 
 pub fn cli_run<T: EthSpec>(matches: &ArgMatches, env: Environment<T>) -> Result<(), String> {
@@ -28,6 +30,7 @@ pub fn cli_run<T: EthSpec>(matches: &ArgMatches, env: Environment<T>) -> Result<
     match matches.subcommand() {
         (create::CMD, Some(matches)) => create::cli_run::<T>(matches, env, base_wallet_dir),
         (deposit::CMD, Some(matches)) => deposit::cli_run::<T>(matches, env),
+        (list::CMD, Some(matches)) => list::cli_run(matches),
         (unknown, _) => Err(format!(
             "{} does not have a {} command. See --help",
             CMD, unknown

common/validator_dir/src/manager.rs

@@ -164,10 +164,12 @@ impl Manager {
     ///
     /// Returns an error if a directory is unable to be read.
     pub fn directory_names(&self) -> Result<HashMap<String, PathBuf>, Error> {
-        Ok(HashMap::from_iter(
-            self.iter_dir()?
-                .into_iter()
-                .map(|path| (format!("{:?}", path), path)),
-        ))
+        Ok(HashMap::from_iter(self.iter_dir()?.into_iter().filter_map(
+            |path| {
+                path.file_name()
+                    .and_then(|os_string| os_string.to_str().map(|s| s.to_string()))
+                    .map(|filename| (filename, path))
+            },
+        )))
     }
 }