New signer token RPC & Initial signer connection without token. (#2096)

* Allowing signer to use initial token

* Generating new tokens via RPC

* Fixing RPC tests

* Fixing signer doctest

* whitespace

[ci:skip]

* whitespace

[ci:skip]

devtools/src/http_client.rs

@@ -14,6 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Parity.  If not, see <http://www.gnu.org/licenses/>.
 
+use std::time::Duration;
 use std::io::{Read, Write};
 use std::str::{self, Lines};
 use std::net::{TcpStream, SocketAddr};
@@ -43,10 +44,11 @@ pub fn read_block(lines: &mut Lines, all: bool) -> String {
 
 pub fn request(address: &SocketAddr, request: &str) -> Response {
 	let mut req = TcpStream::connect(address).unwrap();
+	req.set_read_timeout(Some(Duration::from_secs(1))).unwrap();
 	req.write_all(request.as_bytes()).unwrap();
 
 	let mut response = String::new();
-	req.read_to_string(&mut response).unwrap();
+	let _ = req.read_to_string(&mut response);
 
 	let mut lines = response.lines();
 	let status = lines.next().unwrap().to_owned();

devtools/src/random_path.rs

@@ -23,7 +23,8 @@ use std::ops::{Deref, DerefMut};
 use rand::random;
 
 pub struct RandomTempPath {
-	path: PathBuf
+	path: PathBuf,
+	pub panic_on_drop_failure: bool,
 }
 
 pub fn random_filename() -> String {
@@ -39,7 +40,8 @@ impl RandomTempPath {
 		let mut dir = env::temp_dir();
 		dir.push(random_filename());
 		RandomTempPath {
-			path: dir.clone()
+			path: dir.clone(),
+			panic_on_drop_failure: true,
 		}
 	}
 
@@ -48,7 +50,8 @@ impl RandomTempPath {
 		dir.push(random_filename());
 		fs::create_dir_all(dir.as_path()).unwrap();
 		RandomTempPath {
-			path: dir.clone()
+			path: dir.clone(),
+			panic_on_drop_failure: true,
 		}
 	}
 
@@ -72,12 +75,20 @@ impl AsRef<Path> for RandomTempPath {
 		self.as_path()
 	}
 }
+impl Deref for RandomTempPath {
+	type Target = Path;
+	fn deref(&self) -> &Self::Target {
+		self.as_path()
+	}
+}
 
 impl Drop for RandomTempPath {
 	fn drop(&mut self) {
 		if let Err(_) = fs::remove_dir_all(&self) {
 			if let Err(e) = fs::remove_file(&self) {
-				panic!("Failed to remove temp directory. Here's what prevented this from happening:  ({})", e);
+				if self.panic_on_drop_failure {
+					panic!("Failed to remove temp directory. Here's what prevented this from happening:  ({})", e);
+				}
 			}
 		}
 	}