Repot session.

substrate/wasm-runtime/polkadot/src/runtime/session.rs

@@ -0,0 +1,51 @@
+use runtime_support::Vec;
+use keyedvec::KeyedVec;
+use storage::Storage;
+use primitives::{AccountID, SessionKey, BlockNumber};
+use runtime::{system, staking, consensus};
+
+/// Get the current set of validators. These are the long-term identifiers for the validators
+/// and will be mapped to a session key with the most recent `set_next_session_key`.
+pub fn validators() -> Vec<AccountID> {
+	consensus::authorities()
+}
+
+/// Set the current set of validators.
+///
+/// Called by staking::next_era() only.
+pub fn set_validators(new: &[AccountID]) {
+	consensus::set_authorities(new);
+}
+
+/// The number of blocks in each session.
+pub fn length() -> BlockNumber {
+	Storage::into(b"con\0bps")
+}
+
+/// Sets the session key of `_transactor` to `_session`. This doesn't take effect until the next
+/// session.
+pub fn set_key(_transactor: &AccountID, _session: &AccountID) {
+	// TODO: record the new session key for `_transactor`, ready for the next session.
+}
+
+/// Move onto next session: register the new authority set.
+pub fn next_session() {
+	// TODO: Call set_authorities() with any new authorities.
+}
+
+/// Hook to be called prior to transaction processing.
+pub fn pre_transactions() {
+	staking::pre_transactions();
+}
+
+/// Hook to be called after to transaction processing.
+pub fn post_transactions() {
+	staking::post_transactions();
+
+	// do this last, after the staking system has had chance to switch out the authorities for the
+	// new set.
+	// check block number and call next_session if necessary.
+	if system::block_number() % length() == 0 {
+		next_session();
+	}
+}