Move inherents to primitives (#4126)

* Split Aura and Timestamp inherents out of paint

* fixup node depedencies

* move babe inherents to primitives

* move authorship inherents into primitives

* Move finalty tracker inherents into primitives

* fix aura primitives import

substrate/primitives/authorship/src/lib.rs

@@ -0,0 +1,75 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Authorship Primitives
+
+#![cfg_attr(not(feature = "std"), no_std)]
+
+use rstd::{result::Result, prelude::*};
+
+use codec::{Encode, Decode};
+use sp_inherents::{Error, InherentIdentifier, InherentData};
+
+/// The identifier for the `uncles` inherent.
+pub const INHERENT_IDENTIFIER: InherentIdentifier = *b"uncles00";
+
+/// Auxiliary trait to extract uncles inherent data.
+pub trait UnclesInherentData<H: Decode> {
+	/// Get uncles.
+	fn uncles(&self) -> Result<Vec<H>, Error>;
+}
+
+impl<H: Decode> UnclesInherentData<H> for InherentData {
+	fn uncles(&self) -> Result<Vec<H>, Error> {
+		Ok(self.get_data(&INHERENT_IDENTIFIER)?.unwrap_or_default())
+	}
+}
+
+/// Provider for inherent data.
+#[cfg(feature = "std")]
+pub struct InherentDataProvider<F, H> {
+	inner: F,
+	_marker: std::marker::PhantomData<H>,
+}
+
+#[cfg(feature = "std")]
+impl<F, H> InherentDataProvider<F, H> {
+	pub fn new(uncles_oracle: F) -> Self {
+		InherentDataProvider { inner: uncles_oracle, _marker: Default::default() }
+	}
+}
+
+#[cfg(feature = "std")]
+impl<F, H: Encode + std::fmt::Debug> sp_inherents::ProvideInherentData for InherentDataProvider<F, H>
+where F: Fn() -> Vec<H>
+{
+	fn inherent_identifier(&self) -> &'static InherentIdentifier {
+		&INHERENT_IDENTIFIER
+	}
+
+	fn provide_inherent_data(&self, inherent_data: &mut InherentData) -> Result<(), Error> {
+		let uncles = (self.inner)();
+		if !uncles.is_empty() {
+			inherent_data.put_data(INHERENT_IDENTIFIER, &uncles)
+		} else {
+			Ok(())
+		}
+	}
+
+	fn error_to_string(&self, _error: &[u8]) -> Option<String> {
+		Some(format!("no further information"))
+	}
+}