Display chain status with grin client status (#543)

* Add term and grin_p2p for grin client

* Setting msg as public for the client

* Specifying binary for cargo build

* Minimal client implementation

* Using server configuration for the client

* Display current chain height

* Display difficulty and last block pushed

* Remove unneeded secp256k1 dependency

src/bin/client.rs

@@ -0,0 +1,54 @@
+// Copyright 2016 The Grin Developers
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+extern crate grin_p2p as p2p;
+extern crate term;
+
+use api;
+use grin::ServerConfig;
+
+pub fn show_status(config: &ServerConfig) {
+    println!();
+    let title=format!("Grin Server Status ");
+    let mut t = term::stdout().unwrap();
+    let mut e = term::stdout().unwrap();
+    t.fg(term::color::MAGENTA).unwrap();
+    writeln!(t, "{}", title).unwrap();
+    writeln!(t, "--------------------------").unwrap();
+    t.reset().unwrap();
+    writeln!(e, "Protocol version: {}", p2p::msg::PROTOCOL_VERSION).unwrap();
+    writeln!(e, "User agent: {}", p2p::msg::USER_AGENT).unwrap();
+    match get_tip_from_node(config) {
+        Ok(tip) => {
+            writeln!(e, "Chain height: {}", tip.height).unwrap();
+            writeln!(e, "Total difficulty: {}", tip.total_difficulty).unwrap();
+            writeln!(e, "Last block pushed: {}", tip.last_block_pushed).unwrap()
+        }
+        Err(_) => writeln!(e, "WARNING: Client failed to get data. Is your `grin server` offline or broken?").unwrap()
+    };
+    e.reset().unwrap();
+    println!();
+}
+
+fn get_tip_from_node(config: &ServerConfig) -> Result<api::Tip, Error> {
+	let url = format!("http://{}/v1/chain", config.api_http_addr);
+	api::client::get::<api::Tip>(url.as_str()).map_err(|e| Error::API(e))
+}
+
+/// Error type wrapping underlying module errors.
+#[derive(Debug)]
+enum Error {
+	/// Error originating from HTTP API calls.
+	API(api::Error)
+}

src/bin/grin.rs

@@ -30,6 +30,8 @@ extern crate grin_keychain as keychain;
 extern crate grin_util as util;
 extern crate grin_wallet as wallet;
 
+mod client;
+
 use std::thread;
 use std::io::Read;
 use std::fs::File;
@@ -271,12 +273,7 @@ fn main() {
 
 		// client commands and options
 		("client", Some(client_args)) => {
-			match client_args.subcommand() {
-				("status", _) => {
-					println!("status info...");
-				}
-				_ => panic!("Unknown client command, use 'grin help client' for details"),
-			}
+			client_command(client_args, global_config);
 		}
 
 		// client commands and options
@@ -368,6 +365,18 @@ fn server_command(server_args: &ArgMatches, global_config: GlobalConfig) {
 	}
 }
 
+fn client_command(client_args: &ArgMatches, global_config: GlobalConfig) {
+	// just get defaults from the global config
+	let server_config = global_config.members.unwrap().server;
+
+	match client_args.subcommand() {
+		("status", Some(_)) => {
+			client::show_status(&server_config);
+		}
+		_ => panic!("Unknown client command, use 'grin help client' for details"),
+	}
+}
+
 fn wallet_command(wallet_args: &ArgMatches, global_config: GlobalConfig) {
 	// just get defaults from the global config
 	let mut wallet_config = global_config.members.unwrap().wallet;