Improve errors that confuse new users (#467)

* Make Get coinbase via wallet API error more self-help friendly. Also show the wallet API URL that failed to respond.
* spelling and rustfmt nit
* more informational output from `grin server stop`
* newcomer friendly error when wallet.seed isn't found
* grin wallet (info|outputs): better error message

src/bin/grin.rs

@@ -356,15 +356,18 @@ fn server_command(server_args: &ArgMatches, global_config: GlobalConfig) {
 					}
 				});
 			match daemonize.start() {
-				Ok(_) => info!(LOGGER, "Grin server succesfully started."),
+				Ok(_) => info!(LOGGER, "Grin server successfully started."),
 				Err(e) => error!(LOGGER, "Error starting: {}", e),
 			}
 		}
-		("stop", _) => println!("TODO, just 'kill $pid' for now."),
+		("stop", _) => println!("TODO. Just 'kill $pid' for now. Maybe /tmp/grin.pid is $pid"),
 		(cmd, _) => {
-      println!(":: {:?}", server_args);
+			println!(":: {:?}", server_args);
-      panic!("Unknown server command '{}', use 'grin help server' for details", cmd);
+			panic!(
-    }
+				"Unknown server command '{}', use 'grin help server' for details",
+				cmd
+			);
+		}
 	}
 }
 

wallet/src/client.rs

@@ -35,7 +35,8 @@ pub fn create_coinbase(url: &str, block_fees: &BlockFees) -> Result<CbData, Erro
 		if let Err(_) = res {
 			error!(
 				LOGGER,
-				"Failed to get coinbase via wallet API (will retry)..."
+				"Failed to get coinbase from {}. Run grin wallet listen",
+				url
 			);
 		}
 		res
@@ -69,11 +70,15 @@ fn single_send_partial_tx(url: &str, partial_tx: &PartialTx) -> Result<(), Error
 	req.set_body(json);
 
 	let work = client.request(req);
-	let _ = core.run(work).and_then(|res|{
+	let _ = core.run(work).and_then(|res| {
-		if res.status()==hyper::StatusCode::Ok {
+		if res.status() == hyper::StatusCode::Ok {
 			info!(LOGGER, "Transaction sent successfully");
 		} else {
-			error!(LOGGER, "Error sending transaction - status: {}", res.status());
+			error!(
+				LOGGER,
+				"Error sending transaction - status: {}",
+				res.status()
+			);
 			return Err(hyper::Error::Status);
 		}
 		Ok(())

wallet/src/info.rs

@@ -78,6 +78,10 @@ pub fn show_info(config: &WalletConfig, keychain: &Keychain) {
 	});
 
 	if let Err(_) = result {
-		println!("WARNING - Showing local data only - Wallet was unable to contact a node to update and verify the info shown here.");
+		println!(
+		"\nWARNING: Wallet failed to verify data. \
+		 The above is from local cache and possibly invalid! \
+		 (is your `grin server` offline or broken?)"
+		);
 	}
 }

wallet/src/outputs.rs

@@ -93,6 +93,10 @@ pub fn show_outputs(config: &WalletConfig, keychain: &Keychain, show_spent:bool)
 	});
 
 	if let Err(_) = result {
-		println!("WARNING - Showing local data only - Wallet was unable to contact a node to update and verify the outputs shown here.");
+		println!(
+			"\nWARNING: Wallet failed to verify data. \
+			 The above is from local cache and possibly invalid! \
+			 (is your `grin server` offline or broken?)"
+		);
 	}
 }

wallet/src/types.rs

@@ -354,7 +354,10 @@ impl WalletSeed {
 				LOGGER,
 				"Run: \"grin wallet init\" to initialize a new wallet.",
 			);
-			panic!("wallet seed file does not yet exist (grin wallet init)");
+			panic!(format!(
+				"wallet seed file {} could not be opened (grin wallet init)",
+				seed_file_path
+			));
 		}
 	}
 }
@@ -522,7 +525,6 @@ impl WalletData {
 		max_outputs: usize,
 		default_strategy: bool,
 	) -> Vec<OutputData> {
-
 		// first find all eligible outputs based on number of confirmations
 		let mut eligible = self.outputs
 			.values()