Refactor key management (#3296)

* Add Call type to extensible transactions.

Cleanup some naming

* Merge Resource and BlockExhausted into just Exhausted

* Fix

* Another fix

* Call

* Some fixes

* Fix srml tests.

* Fix all tests.

* Refactor crypto so each application of it has its own type.

* Introduce new AuthorityProvider API into Aura

This will eventually allow for dynamic determination of authority
keys and avoid having to set them directly on CLI.

* Introduce authority determinator for Babe.

Experiment with modular consensus API.

* Work in progress to introduce KeyTypeId and avoid polluting API
with validator IDs

* Finish up drafting imonline

* Rework offchain workers API.

* Rework API implementation.

* Make it compile for wasm, simplify app_crypto.

* Fix compilation of im-online.

* Fix compilation of im-online.

* Fix more compilation errors.

* Make it compile.

* Fixing tests.

* Rewrite `keystore`

* Fix session tests

* Bring back `TryFrom`'s'

* Fix `srml-grandpa`

* Fix `srml-aura`

* Fix consensus babe

* More fixes

* Make service generate keys from dev_seed

* Build fixes

* Remove offchain tests

* More fixes and cleanups

* Fixes finality grandpa

* Fix `consensus-aura`

* Fix cli

* Fix `node-cli`

* Fix chain_spec builder

* Fix doc tests

* Add authority getter for grandpa.

* Test fix

* Fixes

* Make keystore accessible from the runtime

* Move app crypto to its own crate

* Update `Cargo.lock`

* Make the crypto stuff usable from the runtime

* Adds some runtime crypto tests

* Use last finalized block for grandpa authority

* Fix warning

* Adds `SessionKeys` runtime api

* Remove `FinalityPair` and `ConsensusPair`

* Minor governance tweaks to get it inline with docs.

* Make the governance be up to date with the docs.

* Build fixes.

* Generate the inital session keys

* Failing keystore is a hard error

* Make babe work again

* Fix grandpa

* Fix tests

* Disable `keystore` in consensus critical stuff

* Build fix.

* ImOnline supports multiple authorities at once.

* Update core/application-crypto/src/ed25519.rs

* Merge branch 'master' into gav-in-progress

* Remove unneeded code for now.

* Some `session` testing

* Support querying the public keys

* Cleanup offchain

* Remove warnings

* More cleanup

* Apply suggestions from code review

Co-Authored-By: Benjamin Kampmann <ben.kampmann@googlemail.com>

* More cleanups

* JSONRPC API for setting keys.

Also, rename traits::KeyStore* -> traits::BareCryptoStore*

* Bad merge

* Fix integration tests

* Fix test build

* Test fix

* Fixes

* Warnings

* Another warning

* Bump version.

substrate/srml/support/src/storage/hashed/generator.rs

@@ -238,6 +238,23 @@ pub trait StorageMap<K: codec::Codec, V: codec::Codec> {
 	/// Take the value under a key.
 	fn take<S: HashedStorage<Self::Hasher>>(key: &K, storage: &mut S) -> Self::Query;
 
+	/// Swap the values of two keys.
+	fn swap<S: HashedStorage<Self::Hasher>>(key1: &K, key2: &K, storage: &mut S) {
+		let k1 = Self::key_for(key1);
+		let k2 = Self::key_for(key2);
+		let v1 = storage.get_raw(&k1[..]);
+		if let Some(val) = storage.get_raw(&k2[..]) {
+			storage.put_raw(&k1[..], &val[..]);
+		} else {
+			storage.kill(&k1[..])
+		}
+		if let Some(val) = v1 {
+			storage.put_raw(&k2[..], &val[..]);
+		} else {
+			storage.kill(&k2[..])
+		}
+	}
+
 	/// Store a value to be associated with the given key from the map.
 	fn insert<S: HashedStorage<Self::Hasher>>(key: &K, val: &V, storage: &mut S) {
 		storage.put(&Self::key_for(key)[..], val);

substrate/srml/support/src/storage/mod.rs

@@ -191,6 +191,9 @@ pub trait StorageMap<K: Codec, V: Codec> {
 	/// Load the value associated with the given key from the map.
 	fn get<KeyArg: Borrow<K>>(key: KeyArg) -> Self::Query;
 
+	/// Swap the values of two keys.
+	fn swap<KeyArg1: Borrow<K>, KeyArg2: Borrow<K>>(key1: KeyArg1, key2: KeyArg2);
+
 	/// Store a value to be associated with the given key from the map.
 	fn insert<KeyArg: Borrow<K>, ValArg: Borrow<V>>(key: KeyArg, val: ValArg);
 
@@ -227,6 +230,10 @@ impl<K: Codec, V: Codec, U> StorageMap<K, V> for U where U: hashed::generator::S
 		U::get(key.borrow(), &RuntimeStorage)
 	}
 
+	fn swap<KeyArg1: Borrow<K>, KeyArg2: Borrow<K>>(key1: KeyArg1, key2: KeyArg2) {
+		U::swap(key1.borrow(), key2.borrow(), &mut RuntimeStorage)
+	}
+
 	fn insert<KeyArg: Borrow<K>, ValArg: Borrow<V>>(key: KeyArg, val: ValArg) {
 		U::insert(key.borrow(), val.borrow(), &mut RuntimeStorage)
 	}