slog-rs logging (#171)

* added global slog instance, changed all logging macro formats to include logger instance
* adding configuration to logging, allowing for multiple log outputs
* updates to test, changes to build docs
* rustfmt
* moving logging functions into util crate

config/src/config.rs

@@ -22,6 +22,7 @@ use std::fs::File;
 use toml;
 use grin::ServerConfig;
 use pow::types::MinerConfig;
+use util::LoggingConfig;
 use types::{ConfigMembers, GlobalConfig, ConfigError};
 
 /// The default file name to use when trying to derive
@@ -37,6 +38,7 @@ impl Default for ConfigMembers {
 		ConfigMembers {
 			server: ServerConfig::default(),
 			mining: Some(MinerConfig::default()),
+			logging: Some(LoggingConfig::default()),
 		}
 	}
 }

config/src/lib.rs

@@ -30,6 +30,7 @@ extern crate grin_grin as grin;
 extern crate grin_p2p as p2p;
 extern crate grin_wallet as wallet;
 extern crate grin_pow as pow;
+extern crate grin_util as util;
 
 pub mod config;
 pub mod types;

config/src/types.rs

@@ -20,6 +20,7 @@ use std::fmt;
 
 use grin::ServerConfig;
 use pow::types::MinerConfig;
+use util::LoggingConfig;
 
 /// Error type wrapping config errors.
 #[derive(Debug)]
@@ -99,9 +100,12 @@ pub struct ConfigMembers {
 	pub server: ServerConfig,
 	/// Mining config
 	pub mining: Option<MinerConfig>,
-    //removing wallet from here for now,
-    //as its concerns are separate from the server's, really
-    //given it needs to manage keys. It should probably
-    //stay command line only for the time being
-    //pub wallet: Option<WalletConfig>
+	/// Logging config
+	pub logging: Option<LoggingConfig>,
+	
+	//removing wallet from here for now,
+	//as its concerns are separate from the server's, really
+	//given it needs to manage keys. It should probably
+	//stay command line only for the time being
+	//pub wallet: Option<WalletConfig>
 }