1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
// This file is part of Frontier.

// Copyright (C) Parity Technologies (UK) Ltd.
// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0

// This program 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.

// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.

use ethereum_types::H256;
use futures::future::TryFutureExt;
use jsonrpsee::core::RpcResult;
// Substrate
use sc_client_api::backend::{Backend, StorageProvider};
use sc_transaction_pool_api::{InPoolTransaction, TransactionPool};
use sp_api::{ApiExt, ProvideRuntimeApi};
use sp_block_builder::BlockBuilder as BlockBuilderApi;
use sp_blockchain::HeaderBackend;
use sp_core::H160;
use sp_inherents::CreateInherentDataProviders;
use sp_runtime::{traits::Block as BlockT, transaction_validity::TransactionSource};
// Frontier
use fc_rpc_core::types::*;
use fp_rpc::{ConvertTransaction, ConvertTransactionRuntimeApi, EthereumRuntimeRPCApi};

use crate::{
	eth::{format, Eth},
	internal_err, public_key,
};

impl<B, C, P, CT, BE, CIDP, EC> Eth<B, C, P, CT, BE, CIDP, EC>
where
	B: BlockT,
	C: ProvideRuntimeApi<B>,
	C::Api: BlockBuilderApi<B> + ConvertTransactionRuntimeApi<B> + EthereumRuntimeRPCApi<B>,
	C: HeaderBackend<B> + StorageProvider<B, BE> + 'static,
	BE: Backend<B> + 'static,
	P: TransactionPool<Block = B, Hash = B::Hash> + 'static,
	CT: ConvertTransaction<<B as BlockT>::Extrinsic> + 'static,
	CIDP: CreateInherentDataProviders<B, ()> + Send + 'static,
{
	pub async fn send_transaction(&self, request: TransactionRequest) -> RpcResult<H256> {
		let from = match request.from {
			Some(from) => from,
			None => {
				let accounts = match self.accounts() {
					Ok(accounts) => accounts,
					Err(e) => return Err(e),
				};

				match accounts.first() {
					Some(account) => *account,
					None => return Err(internal_err("no signer available")),
				}
			}
		};

		let nonce = match request.nonce {
			Some(nonce) => nonce,
			None => match self.transaction_count(from, None).await {
				Ok(nonce) => nonce,
				Err(e) => return Err(e),
			},
		};

		let chain_id = match (request.chain_id, self.chain_id()) {
			(Some(id), Ok(Some(chain_id))) if id != chain_id => {
				return Err(internal_err("chain id is mismatch"))
			}
			(_, Ok(Some(chain_id))) => chain_id.as_u64(),
			(_, Ok(None)) => return Err(internal_err("chain id not available")),
			(_, Err(e)) => return Err(e),
		};

		let block_hash = self.client.info().best_hash;

		let gas_price = request.gas_price;
		let gas_limit = match request.gas {
			Some(gas_limit) => gas_limit,
			None => {
				if let Ok(Some(block)) = self.client.runtime_api().current_block(block_hash) {
					block.header.gas_limit
				} else {
					return Err(internal_err("block unavailable, cannot query gas limit"));
				}
			}
		};

		let max_fee_per_gas = request.max_fee_per_gas;
		let message: Option<TransactionMessage> = request.into();
		let message = match message {
			Some(TransactionMessage::Legacy(mut m)) => {
				m.nonce = nonce;
				m.chain_id = Some(chain_id);
				m.gas_limit = gas_limit;
				if gas_price.is_none() {
					m.gas_price = self.gas_price().unwrap_or_default();
				}
				TransactionMessage::Legacy(m)
			}
			Some(TransactionMessage::EIP2930(mut m)) => {
				m.nonce = nonce;
				m.chain_id = chain_id;
				m.gas_limit = gas_limit;
				if gas_price.is_none() {
					m.gas_price = self.gas_price().unwrap_or_default();
				}
				TransactionMessage::EIP2930(m)
			}
			Some(TransactionMessage::EIP1559(mut m)) => {
				m.nonce = nonce;
				m.chain_id = chain_id;
				m.gas_limit = gas_limit;
				if max_fee_per_gas.is_none() {
					m.max_fee_per_gas = self.gas_price().unwrap_or_default();
				}
				TransactionMessage::EIP1559(m)
			}
			_ => return Err(internal_err("invalid transaction parameters")),
		};

		let mut transaction = None;
		for signer in &self.signers {
			if signer.accounts().contains(&from) {
				match signer.sign(message, &from) {
					Ok(t) => transaction = Some(t),
					Err(e) => return Err(e),
				}
				break;
			}
		}

		let transaction = match transaction {
			Some(transaction) => transaction,
			None => return Err(internal_err("no signer available")),
		};
		let transaction_hash = transaction.hash();

		let extrinsic = self.convert_transaction(block_hash, transaction)?;

		self.pool
			.submit_one(block_hash, TransactionSource::Local, extrinsic)
			.map_ok(move |_| transaction_hash)
			.map_err(|err| internal_err(format::Geth::pool_error(err)))
			.await
	}

	pub async fn send_raw_transaction(&self, bytes: Bytes) -> RpcResult<H256> {
		let bytes = bytes.into_vec();
		if bytes.is_empty() {
			return Err(internal_err("transaction data is empty"));
		}

		let transaction: ethereum::TransactionV2 =
			match ethereum::EnvelopedDecodable::decode(&bytes) {
				Ok(transaction) => transaction,
				Err(_) => return Err(internal_err("decode transaction failed")),
			};
		let transaction_hash = transaction.hash();

		let block_hash = self.client.info().best_hash;
		let extrinsic = self.convert_transaction(block_hash, transaction)?;

		self.pool
			.submit_one(block_hash, TransactionSource::Local, extrinsic)
			.map_ok(move |_| transaction_hash)
			.map_err(|err| internal_err(format::Geth::pool_error(err)))
			.await
	}

	pub async fn pending_transactions(&self) -> RpcResult<Vec<Transaction>> {
		let ready = self
			.graph
			.ready()
			.map(|in_pool_tx| in_pool_tx.data().as_ref().clone())
			.collect::<Vec<_>>();

		let future = self
			.graph
			.futures()
			.iter()
			.map(|in_pool_tx| in_pool_tx.data().as_ref().clone())
			.collect::<Vec<_>>();

		let all_extrinsics = ready
			.iter()
			.chain(future.iter())
			.cloned()
			.collect::<Vec<_>>();

		let best_block = self.client.info().best_hash;
		let api = self.client.runtime_api();

		let api_version = api
			.api_version::<dyn EthereumRuntimeRPCApi<B>>(best_block)
			.map_err(|err| internal_err(format!("Failed to get API version: {}", err)))?
			.ok_or_else(|| internal_err("Failed to get API version"))?;

		let ethereum_txs = if api_version > 1 {
			api.extrinsic_filter(best_block, all_extrinsics)
				.map_err(|err| internal_err(format!("Runtime call failed: {}", err)))?
		} else {
			#[allow(deprecated)]
			let legacy = api
				.extrinsic_filter_before_version_2(best_block, all_extrinsics)
				.map_err(|err| internal_err(format!("Runtime call failed: {}", err)))?;
			legacy.into_iter().map(|tx| tx.into()).collect()
		};

		let transactions = ethereum_txs
			.into_iter()
			.filter_map(|tx| {
				let pubkey = match public_key(&tx) {
					Ok(pk) => H160::from(H256::from(sp_core::hashing::keccak_256(&pk))),
					Err(_err) => {
						// Skip transactions with invalid public keys
						return None;
					}
				};

				Some(Transaction::build_from(pubkey, &tx))
			})
			.collect();

		Ok(transactions)
	}

	fn convert_transaction(
		&self,
		block_hash: B::Hash,
		transaction: ethereum::TransactionV2,
	) -> RpcResult<B::Extrinsic> {
		let api_version = match self
			.client
			.runtime_api()
			.api_version::<dyn ConvertTransactionRuntimeApi<B>>(block_hash)
		{
			Ok(api_version) => api_version,
			_ => return Err(internal_err("cannot access `ConvertTransactionRuntimeApi`")),
		};

		match api_version {
			Some(2) => match self
				.client
				.runtime_api()
				.convert_transaction(block_hash, transaction)
			{
				Ok(extrinsic) => Ok(extrinsic),
				Err(_) => Err(internal_err("cannot access `ConvertTransactionRuntimeApi`")),
			},
			Some(1) => {
				if let ethereum::TransactionV2::Legacy(legacy_transaction) = transaction {
					// To be compatible with runtimes that do not support transactions v2
					#[allow(deprecated)]
					match self
						.client
						.runtime_api()
						.convert_transaction_before_version_2(block_hash, legacy_transaction)
					{
						Ok(extrinsic) => Ok(extrinsic),
						Err(_) => Err(internal_err("cannot access `ConvertTransactionRuntimeApi`")),
					}
				} else {
					Err(internal_err(
						"Ethereum transactions v2 is not supported by the runtime",
					))
				}
			}
			None => {
				if let Some(ref convert_transaction) = self.convert_transaction {
					Ok(convert_transaction.convert_transaction(transaction.clone()))
				} else {
					Err(internal_err(
						"`ConvertTransactionRuntimeApi` is not found and no `TransactionConverter` is provided"
					))
				}
			}
			_ => Err(internal_err(
				"`ConvertTransactionRuntimeApi` is not supported",
			)),
		}
	}
}