Add parity_removeAddress RPC

ethcore/src/account_provider/mod.rs

@@ -194,6 +194,11 @@ impl AccountProvider {
 		Ok(self.address_book.write().set_meta(account, meta))
 	}
 
+	/// Removes and address from the addressbook
+	pub fn remove_address(&self, addr: Address) -> Result<(), Error> {
+		Ok(self.address_book.write().remove(addr))
+	}
+
 	/// Returns each account along with name and meta.
 	pub fn accounts_info(&self) -> Result<HashMap<Address, AccountMeta>, Error> {
 		let r: HashMap<Address, AccountMeta> = try!(self.sstore.accounts())

ethcore/src/account_provider/stores.rs

@@ -74,6 +74,14 @@ impl AddressBook {
 		}
 		self.save();
 	}
+
+	/// Removes an entry
+	pub fn remove(&mut self, a: Address) {
+		{
+			self.cache.remove(&a);
+		}
+		self.save();
+	}
 }
 
 /// Dapps user settings
@@ -244,4 +252,22 @@ mod tests {
 			}
 		]);
 	}
+
+	#[test]
+	fn should_remove_address() {
+		let temp = RandomTempPath::create_dir();
+		let path = temp.as_str().to_owned();
+		let mut b = AddressBook::new(path.clone());
+
+		b.set_name(1.into(), "One".to_owned());
+		b.set_name(2.into(), "Two".to_owned());
+		b.set_name(3.into(), "Three".to_owned());
+		b.remove(2.into());
+
+		let b = AddressBook::new(path);
+		assert_eq!(b.get(), hash_map![
+			1.into() => AccountMeta{name: "One".to_owned(), meta: "{}".to_owned(), uuid: None},
+			3.into() => AccountMeta{name: "Three".to_owned(), meta: "{}".to_owned(), uuid: None}
+		]);
+	}
 }