Staking support (#99)

* Initial Staking API

* Add more staking types

* Reformat

* Remove dead code

* Fix missing documentation

* Reformat

* Staking: use proc macros

* Add partial session support

* Reformat

* Try to implement nomination

This currently fails with compilation errors I do not understand.

* Use the #[module] macro

This fixes a compile error

* Explain undefined method diagnostics

* Use ‘#[module]’ and implement session for Kusama

* Don’t impl ‘Staking’ for all ‘T: System’

* Add staking payout support

* Fix compilation errors and remove useless lifetimes

* Respond to code review

This fixes most of the issues found during review, with the exception of
tests.

* Make signing fallable and asynchronous

This is needed for hardware wallets, which require human confirmation to
sign transactions.  Blocking on a human to sign transactions is not a
good idea, and the signing might fail for many reasons (device
unplugged, authorization not granted, etc).

* Reformat

* Refactor as suggested by Andrew Jones (@ascjones).

* Reformat

* Refactor as suggested by Andrew Jones (@ascjones).

* Trait cleanups

* Make the `Signer` impl require Send + Sync

This is what Ledgeracio needs.

* Use the correct key for staking maps

They use the key type, not ‘PhantomData’.

* Implement set_payee call

* Switch to associated types for Staking

* Implement `set_keys`

This is needed for Ledgeracio.

* Remove impl of Signer for Box<dyn Signer + Send + Sync>

It isn’t needed, since Box implements Deref.

* Fix Polkadot and Kusama ‘SessionKey’ structs

I had failed to include the ‘Parachains’ component, which the default
Substrate runtime doesn’t have.

* Include a copy of `ValidatorId`

This avoids needing to depend on Polkadot.

* Fix syntax error in Cargo.toml

* Fix compile errors

* Add Debug impls

* Fix return type of `BondedStore`

* Use some upstream type definitions

Also add `Default` impls.

* Bump deps and fix build

* Remove last reference to Kusama feature

* Fix compilation errors

* Implement the `concat` in `twox_64_concat`

* Expose properties and per-era preferences

* Era rewards point support

I also did some refactoring.

* Expose clipped exposure

* Era reward points support

* Make `PayoutStakersCall` public

* Add in all default features for debugging

* Chill support and update to latest Substrate

* If property fetch fails, use dummy values

* Fix tests

* Fix header

* Remove some code Ledgeracio does not need

* More deletions

* Remove more code not needed for Ledgeracio

* Remove a pointless change in Cargo.toml

w.r.t. upstream.

* Remove more junk

* Revert contracts put_code test to pure code (not using the macro)

* Test contract instantiate

* Fmt

* WIP

* Add some more submission tests

* Reformat

* More tests

* Cleanup

* Hopefully fix CI

* Remove dead code

* Test chill

* Add missing docs

* Remove unnecessary use

* Revert "Remove unnecessary use"

This reverts commit bc8bc36bde581f1892ea88a778dfe0fe5bff24d7.

* Retry on temporary failures

* Ignore the staking tests on CI

* Obey the fmt

* Run CI with at most one test thread

* Implement tests for staking

* More tests

* Remove unhelpful println!

* Revert changes in contract tests

* Reformat

* Remove spurious diff

* More tests

Co-authored-by: Demi M. Obenour <demiobenour@gmail.com>
Co-authored-by: David Palm <dvdplm@gmail.com>
Co-authored-by: Andrew Jones <ascjones@gmail.com>

src/lib.rs

@@ -35,7 +35,8 @@
     while_true,
     trivial_casts,
     trivial_numeric_casts,
-    unused_extern_crates
+    unused_extern_crates,
+    clippy::all
 )]
 #![allow(clippy::type_complexity)]
 
@@ -93,6 +94,7 @@ pub use crate::{
     rpc::{
         BlockNumber,
         ExtrinsicSuccess,
+        SystemProperties,
     },
     runtimes::*,
     subscription::*,
@@ -161,16 +163,18 @@ impl<T: Runtime> ClientBuilder<T> {
             }
         };
         let rpc = Rpc::new(client);
-        let (metadata, genesis_hash, runtime_version) = future::join3(
+        let (metadata, genesis_hash, runtime_version, properties) = future::join4(
             rpc.metadata(),
             rpc.genesis_hash(),
             rpc.runtime_version(None),
+            rpc.system_properties(),
         )
         .await;
         Ok(Client {
             rpc,
             genesis_hash: genesis_hash?,
             metadata: metadata?,
+            properties: properties.unwrap_or_else(|_| Default::default()),
             runtime_version: runtime_version?,
             _marker: PhantomData,
             page_size: self.page_size.unwrap_or(10),
@@ -183,6 +187,7 @@ pub struct Client<T: Runtime> {
     rpc: Rpc<T>,
     genesis_hash: T::Hash,
     metadata: Metadata,
+    properties: SystemProperties,
     runtime_version: RuntimeVersion,
     _marker: PhantomData<(fn() -> T::Signature, T::Extra)>,
     page_size: u32,
@@ -194,6 +199,7 @@ impl<T: Runtime> Clone for Client<T> {
             rpc: self.rpc.clone(),
             genesis_hash: self.genesis_hash,
             metadata: self.metadata.clone(),
+            properties: self.properties.clone(),
             runtime_version: self.runtime_version.clone(),
             _marker: PhantomData,
             page_size: self.page_size,
@@ -258,6 +264,11 @@ impl<T: Runtime> Client<T> {
         &self.metadata
     }
 
+    /// Returns the system properties
+    pub fn properties(&self) -> &SystemProperties {
+        &self.properties
+    }
+
     /// Fetch the value under an unhashed storage key
     pub async fn fetch_unhashed<V: Decode>(
         &self,