Merged master and fixed merge conflicts with Config updates.

validator_client/src/config.rs

@@ -1,69 +1,158 @@
 use clap::ArgMatches;
-use slog::{error, info};
+use bincode;
+use bls::Keypair;
+use slog::{debug, error, info};
 use std::fs;
+use std::fs::File;
+use std::io::{Error, ErrorKind};
 use std::path::PathBuf;
 use types::ChainSpec;
 
 /// Stores the core configuration for this validator instance.
 #[derive(Clone)]
 pub struct Config {
+    /// The data directory, which stores all validator databases
     pub data_dir: PathBuf,
+    /// The server at which the Beacon Node can be contacted
     pub server: String,
+    /// The chain specification that we are connecting to
     pub spec: ChainSpec,
 }
 
-const DEFAULT_LIGHTHOUSE_DIR: &str = ".lighthouse-validators";
+const DEFAULT_PRIVATE_KEY_FILENAME: &str = "private.key";
 
-impl Config {
+impl Default for Config {
     /// Build a new configuration from defaults.
-    pub fn default() -> Self {
+    fn default() -> Self {
         let data_dir = {
-            let home = dirs::home_dir().expect("Unable to determine home dir.");
-            home.join(DEFAULT_LIGHTHOUSE_DIR)
+            let home = dirs::home_dir().expect("Unable to determine home directory.");
+            home.join(".lighthouse-validator")
         };
-        fs::create_dir_all(&data_dir)
-            .unwrap_or_else(|_| panic!("Unable to create {:?}", &data_dir));
+
         let server = "localhost:5051".to_string();
+
         let spec = ChainSpec::foundation();
+
         Self {
             data_dir,
             server,
             spec,
         }
     }
+}
 
-    pub fn parse_args(matches: ArgMatches, log: &slog::Logger) -> Result<Self, &'static str> {
+impl Config {
+    /// Build a new configuration from defaults, which are overrided by arguments provided.
+    pub fn parse_args(args: &ArgMatches, log: &slog::Logger) -> Result<Self, Error> {
         let mut config = Config::default();
-        // Custom datadir
-        if let Some(dir) = matches.value_of("datadir") {
-            config.data_dir = PathBuf::from(dir.to_string());
-        }
 
-        // Custom server port
-        if let Some(server_str) = matches.value_of("server") {
-            if let Ok(addr) = server_str.parse::<u16>() {
-                config.server = addr.to_string();
-            } else {
-                error!(log, "Invalid address"; "server" => server_str);
-                return Err("Invalid address");
-            }
-        }
+        // Use the specified datadir, or default in the home directory
+        if let Some(datadir) = args.value_of("datadir") {
+            config.data_dir = PathBuf::from(datadir);
+            info!(log, "Using custom data dir: {:?}", &config.data_dir);
+        };
+
+        fs::create_dir_all(&config.data_dir)
+            .unwrap_or_else(|_| panic!("Unable to create {:?}", &config.data_dir));
+
+        if let Some(srv) = args.value_of("server") {
+            //TODO: Validate the server value, to ensure it makes sense.
+            config.server = srv.to_string();
+            info!(log, "Using custom server: {:?}", &config.server);
+        };
 
         // TODO: Permit loading a custom spec from file.
-        // Custom spec
-        if let Some(spec_str) = matches.value_of("spec") {
-            match spec_str {
-                "foundation" => config.spec = ChainSpec::foundation(),
-                "few_validators" => config.spec = ChainSpec::few_validators(),
+        if let Some(spec_str) = args.value_of("spec") {
+            info!(log, "Using custom spec: {:?}", spec_str);
+            config.spec = match spec_str {
+                "foundation" => ChainSpec::foundation(),
+                "few_validators" => ChainSpec::few_validators(),
                 // Should be impossible due to clap's `possible_values(..)` function.
                 _ => unreachable!(),
             };
-        }
-
+        };
         // Log configuration
         info!(log, "";
               "data_dir" => &config.data_dir.to_str(),
               "server" => &config.server);
+
         Ok(config)
     }
+
+    /// Try to load keys from validator_dir, returning None if none are found or an error.
+    pub fn fetch_keys(&self, log: &slog::Logger) -> Option<Vec<Keypair>> {
+        let key_pairs: Vec<Keypair> = fs::read_dir(&self.data_dir)
+            .unwrap()
+            .filter_map(|validator_dir| {
+                let validator_dir = validator_dir.ok()?;
+
+                if !(validator_dir.file_type().ok()?.is_dir()) {
+                    // Skip non-directories (i.e. no files/symlinks)
+                    return None;
+                }
+
+                let key_filename = validator_dir.path().join(DEFAULT_PRIVATE_KEY_FILENAME);
+
+                if !(key_filename.is_file()) {
+                    info!(
+                        log,
+                        "Private key is not a file: {:?}",
+                        key_filename.to_str()
+                    );
+                    return None;
+                }
+
+                debug!(
+                    log,
+                    "Deserializing private key from file: {:?}",
+                    key_filename.to_str()
+                );
+
+                let mut key_file = File::open(key_filename.clone()).ok()?;
+
+                let key: Keypair = if let Ok(key_ok) = bincode::deserialize_from(&mut key_file) {
+                    key_ok
+                } else {
+                    error!(
+                        log,
+                        "Unable to deserialize the private key file: {:?}", key_filename
+                    );
+                    return None;
+                };
+
+                let ki = key.identifier();
+                if ki != validator_dir.file_name().into_string().ok()? {
+                    error!(
+                        log,
+                        "The validator key ({:?}) did not match the directory filename {:?}.",
+                        ki,
+                        &validator_dir.path().to_string_lossy()
+                    );
+                    return None;
+                }
+                Some(key)
+            })
+            .collect();
+
+        // Check if it's an empty vector, and return none.
+        if key_pairs.is_empty() {
+            None
+        } else {
+            Some(key_pairs)
+        }
+    }
+
+    /// Saves a keypair to a file inside the appropriate validator directory. Returns the saved path filename.
+    pub fn save_key(&self, key: &Keypair) -> Result<PathBuf, Error> {
+        let validator_config_path = self.data_dir.join(key.identifier());
+        let key_path = validator_config_path.join(DEFAULT_PRIVATE_KEY_FILENAME);
+
+        fs::create_dir_all(&validator_config_path)?;
+
+        let mut key_file = File::create(&key_path)?;
+
+        bincode::serialize_into(&mut key_file, &key)
+            .map_err(|e| Error::new(ErrorKind::InvalidData, e))?;
+        Ok(key_path)
+    }
 }

validator_client/src/lib.rs

@@ -0,0 +1,3 @@
+pub mod config;
+
+pub use crate::config::Config;

validator_client/src/main.rs

@@ -4,7 +4,7 @@ mod config;
 mod duties;
 mod service;
 
-use crate::config::Config as ValidatorConfig;
+use crate::config::Config as ValidatorClientConfig;
 use clap::{App, Arg};
 use service::Service as ValidatorService;
 use slog::{o, Drain};
@@ -47,7 +47,8 @@ fn main() {
         )
         .get_matches();
 
-    let config = ValidatorConfig::parse_args(matches, &log).unwrap();
+    let config = ValidatorClientConfig::parse_args(&matches, &log)
+        .expect("Unable to build a configuration for the validator client.");
 
     // start the validator service.
     ValidatorService::start(config, log);