Contract accounting removal (#2230)

* first partial implementation

* update rent allowance

* fmt

Co-Authored-By: thiolliere <gui.thiolliere@gmail.com>

* remove comments

* reward surcharge claims

* remove rent allowance in param + code_hash changed

* Fix bug

* fix tests

* fmt

* impl getter setter rent allowance

* fmt

Co-Authored-By: thiolliere <gui.thiolliere@gmail.com>

* comments

* doc + be->le

* doc

* doc

* fix improve fast return

* renamings

* rename + COMPLEXITY

* COMPLEXITY

* add test

* etrinsic claim surcharge delay configurable

* comment addressed

* move and rewrite of pay_rent

* remove child trie

* fmt

* use derive

* arithmetic operation

* fix

* fix storage root + checked_mul + test

* WIP: test

* WIP

* add tests and fix

* fmt

* typo and doc suggestions

Co-Authored-By: thiolliere <gui.thiolliere@gmail.com>

* WIP

* address some comments

divide tests + some docs

* use br_table

* remove unused function

* Bump the runtime version

* insert_with

* Add some comments.

* Refactor

* Shuffle and fix comments

* More comment fixes.

* dues limited

* Add comment

* Handicap

* Docs.

* Apply suggestions from code review

Co-Authored-By: pepyakin <s.pepyakin@gmail.com>

* Coalesce block_passed in a block

* Fix build

* Paid → Ok

* match → if

* Imrpove handicap description

substrate/srml/contract/src/wasm/mod.rs

@@ -200,6 +200,7 @@ mod tests {
 	#[derive(Default)]
 	pub struct MockExt {
 		storage: HashMap<StorageKey, Vec<u8>>,
+		rent_allowance: u64,
 		creates: Vec<CreateEntry>,
 		transfers: Vec<TransferEntry>,
 		dispatches: Vec<DispatchEntry>,
@@ -281,6 +282,14 @@ mod tests {
 		fn deposit_event(&mut self, data: Vec<u8>) {
 			self.events.push(data)
 		}
+
+		fn set_rent_allowance(&mut self, rent_allowance: u64) {
+			self.rent_allowance = rent_allowance;
+		}
+
+		fn rent_allowance(&self) -> u64 {
+			self.rent_allowance
+		}
 	}
 
 	fn execute<E: Ext>(

substrate/srml/contract/src/wasm/runtime.rs

@@ -629,6 +629,31 @@ define_env!(Env, <E: Ext>,
 		Ok(())
 	},
 
+	// Set rent allowance of the contract
+	//
+	// - value_ptr: a pointer to the buffer with value, how much to allow for rent
+	//   Should be decodable as a `T::Balance`. Traps otherwise.
+	// - value_len: length of the value buffer.
+	ext_set_rent_allowance(ctx, value_ptr: u32, value_len: u32) => {
+		let value = {
+			let value_buf = read_sandbox_memory(ctx, value_ptr, value_len)?;
+			BalanceOf::<<E as Ext>::T>::decode(&mut &value_buf[..])
+				.ok_or_else(|| sandbox::HostError)?
+		};
+		ctx.ext.set_rent_allowance(value);
+
+		Ok(())
+	},
+
+	// Stores the rent allowance into the scratch buffer.
+	//
+	// The data is encoded as T::Balance. The current contents of the scratch buffer are overwritten.
+	ext_rent_allowance(ctx) => {
+		ctx.scratch_buf = ctx.ext.rent_allowance().encode();
+
+		Ok(())
+	},
+
 	// Prints utf8 encoded string from the data buffer.
 	// Only available on `--dev` chains.
 	// This function may be removed at any time, superseded by a more general contract debugging feature.