impls.rs 12.1 KB
Newer Older
1
// Copyright 2018-2020 Parity Technologies (UK) Ltd.
2
3
4
5
6
7
8
9
10
11
12
13
14
15
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use super::{
16
    hashing,
17
18
19
20
21
    Account,
    EnvInstance,
};
use crate::env::{
    call::{
22
        utils::ReturnType,
23
        CallParams,
24
        CreateParams,
25
    },
26
27
28
    Blake2x128,
    Blake2x256,
    CryptoHash,
29
    Env,
30
    EnvError,
31
    EnvTypes,
32
33
    HashOutput,
    Keccak256,
34
    Result,
Hero Bird's avatar
Hero Bird committed
35
    ReturnFlags,
36
    Sha2x256,
37
38
39
    Topics,
    TypedEnv,
};
40
use core::convert::TryInto;
Hero Bird's avatar
Hero Bird committed
41
use ink_primitives::Key;
42
use num_traits::Bounded;
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

impl EnvInstance {
    /// Returns the callee account.
    fn callee_account(&self) -> &Account {
        let callee = self
            .exec_context()
            .expect("uninitialized execution context")
            .callee
            .clone();
        self.accounts
            .get_account_off(&callee)
            .expect("callee account does not exist")
    }

    /// Returns the callee account as mutable reference.
    fn callee_account_mut(&mut self) -> &mut Account {
        let callee = self
            .exec_context()
            .expect("uninitialized execution context")
            .callee
            .clone();
        self.accounts
            .get_account_off_mut(&callee)
            .expect("callee account does not exist")
    }
}

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
impl CryptoHash for Blake2x128 {
    fn hash(input: &[u8], output: &mut <Self as HashOutput>::Type) {
        type OutputType = [u8; 16];
        static_assertions::assert_type_eq_all!(
            <Blake2x128 as HashOutput>::Type,
            OutputType
        );
        let output: &mut OutputType = arrayref::array_mut_ref!(output, 0, 16);
        hashing::blake2b_128(input, output);
    }
}

impl CryptoHash for Blake2x256 {
    fn hash(input: &[u8], output: &mut <Self as HashOutput>::Type) {
        type OutputType = [u8; 32];
        static_assertions::assert_type_eq_all!(
            <Blake2x256 as HashOutput>::Type,
            OutputType
        );
        let output: &mut OutputType = arrayref::array_mut_ref!(output, 0, 32);
        hashing::blake2b_256(input, output);
    }
}

impl CryptoHash for Sha2x256 {
    fn hash(input: &[u8], output: &mut <Self as HashOutput>::Type) {
        type OutputType = [u8; 32];
        static_assertions::assert_type_eq_all!(
            <Sha2x256 as HashOutput>::Type,
            OutputType
        );
        let output: &mut OutputType = arrayref::array_mut_ref!(output, 0, 32);
        hashing::sha2_256(input, output);
    }
}

impl CryptoHash for Keccak256 {
    fn hash(input: &[u8], output: &mut <Self as HashOutput>::Type) {
        type OutputType = [u8; 32];
        static_assertions::assert_type_eq_all!(
            <Keccak256 as HashOutput>::Type,
            OutputType
        );
        let output: &mut OutputType = arrayref::array_mut_ref!(output, 0, 32);
        hashing::keccak_256(input, output);
    }
}

118
impl Env for EnvInstance {
119
    fn set_contract_storage<V>(&mut self, key: &Key, value: &V)
120
121
122
123
    where
        V: scale::Encode,
    {
        self.callee_account_mut()
124
            .set_storage(*key, value)
125
126
127
            .expect("callee account is not a smart contract");
    }

Hero Bird's avatar
Hero Bird committed
128
    fn get_contract_storage<R>(&mut self, key: &Key) -> Result<Option<R>>
129
130
131
132
    where
        R: scale::Decode,
    {
        self.callee_account()
133
            .get_storage::<R>(*key)
Hero Bird's avatar
Hero Bird committed
134
            .map_err(Into::into)
135
136
    }

137
    fn clear_contract_storage(&mut self, key: &Key) {
138
        self.callee_account_mut()
139
            .clear_storage(*key)
140
141
142
            .expect("callee account is not a smart contract");
    }

143
144
145
146
    fn decode_input<T>(&mut self) -> Result<T>
    where
        T: scale::Decode,
    {
147
148
        self.exec_context()
            .map(|exec_ctx| &exec_ctx.call_data)
149
            .map(|call_data| scale::Encode::encode(call_data))
150
            .map_err(Into::into)
151
152
153
154
155
            .and_then(|encoded| {
                <T as scale::Decode>::decode(&mut &encoded[..])
                    .map_err(|_| scale::Error::from("could not decode input call data"))
                    .map_err(Into::into)
            })
156
157
    }

Hero Bird's avatar
Hero Bird committed
158
    fn return_value<R>(&mut self, flags: ReturnFlags, return_value: &R) -> !
159
160
161
162
163
164
165
    where
        R: scale::Encode,
    {
        let ctx = self
            .exec_context_mut()
            .expect("uninitialized execution context");
        ctx.output = Some(return_value.encode());
Hero Bird's avatar
Hero Bird committed
166
        std::process::exit(flags.into_u32() as i32)
167
168
169
170
171
    }

    fn println(&mut self, content: &str) {
        self.console.println(content)
    }
172

173
174
175
176
177
    fn hash_bytes<H>(&mut self, input: &[u8], output: &mut <H as HashOutput>::Type)
    where
        H: CryptoHash,
    {
        <H as CryptoHash>::hash(input, output)
178
179
    }

180
181
182
183
184
185
186
    fn hash_encoded<H, T>(&mut self, input: &T, output: &mut <H as HashOutput>::Type)
    where
        H: CryptoHash,
        T: scale::Encode,
    {
        let encoded = input.encode();
        self.hash_bytes::<H>(&encoded[..], output)
187
    }
Hero Bird's avatar
Hero Bird committed
188
189
190
191
192
193
194
195
196
197
198
199

    #[cfg(feature = "ink-unstable-chain-extensions")]
    fn call_chain_extension<I, O>(&mut self, func_id: u32, input: &I) -> Result<O>
    where
        I: scale::Codec + 'static,
        O: scale::Codec + 'static,
    {
        self.chain_extension_handler.eval(func_id, input)
    }
}

impl EnvInstance {
200
201
202
203
204
    fn transfer_impl<T>(
        &mut self,
        destination: T::AccountId,
        value: T::Balance,
    ) -> Result<()>
Hero Bird's avatar
Hero Bird committed
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
    where
        T: EnvTypes,
    {
        let src_id = self.account_id::<T>()?;
        let src_value = self
            .accounts
            .get_account::<T>(&src_id)
            .expect("account of executed contract must exist")
            .balance::<T>()?;
        if src_value < value {
            return Err(EnvError::TransferFailed)
        }
        let dst_value = self
            .accounts
            .get_or_create_account::<T>(&destination)
            .balance::<T>()?;
        self.accounts
            .get_account_mut::<T>(&src_id)
            .expect("account of executed contract must exist")
            .set_balance::<T>(src_value - value)?;
        self.accounts
            .get_account_mut::<T>(&destination)
            .expect("the account must exist already or has just been created")
            .set_balance::<T>(dst_value + value)?;
        Ok(())
    }
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
}

impl TypedEnv for EnvInstance {
    fn caller<T: EnvTypes>(&mut self) -> Result<T::AccountId> {
        self.exec_context()
            .expect("uninitialized execution context")
            .caller::<T>()
            .map_err(|_| scale::Error::from("could not decode caller"))
            .map_err(Into::into)
    }

    fn transferred_balance<T: EnvTypes>(&mut self) -> Result<T::Balance> {
        self.exec_context()
            .expect("uninitialized execution context")
            .transferred_value::<T>()
            .map_err(|_| scale::Error::from("could not decode transferred balance"))
            .map_err(Into::into)
    }

250
    /// Emulates gas price calculation
Hero Bird's avatar
Hero Bird committed
251
    fn weight_to_fee<T: EnvTypes>(&mut self, gas: u64) -> Result<T::Balance> {
252
253
        use crate::env::arithmetic::Saturating as _;

Hero Bird's avatar
Hero Bird committed
254
255
        let gas_price = self
            .chain_spec
256
            .gas_price::<T>()
257
258
            .map_err(|_| scale::Error::from("could not decode gas price"))?;

Hero Bird's avatar
Hero Bird committed
259
260
        Ok(gas_price
            .saturating_mul(gas.try_into().unwrap_or_else(|_| Bounded::max_value())))
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
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
    }

    fn gas_left<T: EnvTypes>(&mut self) -> Result<T::Balance> {
        self.exec_context()
            .expect("uninitialized execution context")
            .gas::<T>()
            .map_err(|_| scale::Error::from("could not decode gas left"))
            .map_err(Into::into)
    }

    fn block_timestamp<T: EnvTypes>(&mut self) -> Result<T::Timestamp> {
        self.current_block()
            .expect("uninitialized execution context")
            .timestamp::<T>()
            .map_err(|_| scale::Error::from("could not decode block time"))
            .map_err(Into::into)
    }

    fn account_id<T: EnvTypes>(&mut self) -> Result<T::AccountId> {
        self.exec_context()
            .expect("uninitialized execution context")
            .callee::<T>()
            .map_err(|_| scale::Error::from("could not decode callee"))
            .map_err(Into::into)
    }

    fn balance<T: EnvTypes>(&mut self) -> Result<T::Balance> {
        self.callee_account()
            .balance::<T>()
            .map_err(|_| scale::Error::from("could not decode callee balance"))
            .map_err(Into::into)
    }

    fn rent_allowance<T: EnvTypes>(&mut self) -> Result<T::Balance> {
        self.callee_account()
            .rent_allowance::<T>()
            .map_err(|_| scale::Error::from("could not decode callee rent allowance"))
            .map_err(Into::into)
    }

    fn block_number<T: EnvTypes>(&mut self) -> Result<T::BlockNumber> {
        self.current_block()
            .expect("uninitialized execution context")
            .number::<T>()
            .map_err(|_| scale::Error::from("could not decode block number"))
            .map_err(Into::into)
    }

    fn minimum_balance<T: EnvTypes>(&mut self) -> Result<T::Balance> {
        self.chain_spec
            .minimum_balance::<T>()
            .map_err(|_| scale::Error::from("could not decode minimum balance"))
            .map_err(Into::into)
    }

    fn tombstone_deposit<T: EnvTypes>(&mut self) -> Result<T::Balance> {
        self.chain_spec
            .tombstone_deposit::<T>()
            .map_err(|_| scale::Error::from("could not decode tombstone deposit"))
            .map_err(Into::into)
    }

    fn emit_event<T, Event>(&mut self, new_event: Event)
    where
        T: EnvTypes,
        Event: Topics<T> + scale::Encode,
    {
        self.emitted_events.record::<T, Event>(new_event)
    }

    fn set_rent_allowance<T>(&mut self, new_rent_allowance: T::Balance)
    where
        T: EnvTypes,
    {
        self.callee_account_mut()
            .set_rent_allowance::<T>(new_rent_allowance)
            .expect("could not encode rent allowance")
    }

340
341
342
343
    fn invoke_contract<T, Args>(
        &mut self,
        _call_params: &CallParams<T, Args, ()>,
    ) -> Result<()>
344
345
    where
        T: EnvTypes,
346
        Args: scale::Encode,
347
348
349
350
    {
        unimplemented!("off-chain environment does not support contract invokation")
    }

351
    fn eval_contract<T, Args, R>(
352
        &mut self,
353
        _call_params: &CallParams<T, Args, ReturnType<R>>,
354
355
356
    ) -> Result<R>
    where
        T: EnvTypes,
357
        Args: scale::Encode,
358
359
360
361
362
        R: scale::Decode,
    {
        unimplemented!("off-chain environment does not support contract evaluation")
    }

363
    fn instantiate_contract<T, Args, C>(
364
        &mut self,
365
        _params: &CreateParams<T, Args, C>,
366
367
368
    ) -> Result<T::AccountId>
    where
        T: EnvTypes,
369
        Args: scale::Encode,
370
371
372
373
    {
        unimplemented!("off-chain environment does not support contract instantiation")
    }

374
375
376
377
378
379
380
    fn terminate_contract<T>(&mut self, _beneficiary: T::AccountId) -> !
    where
        T: EnvTypes,
    {
        unimplemented!("off-chain environment does not support contract termination")
    }

381
382
383
384
385
386
387
388
389
390
391
392
    fn restore_contract<T>(
        &mut self,
        _account_id: T::AccountId,
        _code_hash: T::Hash,
        _rent_allowance: T::Balance,
        _filtered_keys: &[Key],
    ) where
        T: EnvTypes,
    {
        unimplemented!("off-chain environment does not support contract restoration")
    }

393
394
395
396
    fn transfer<T>(&mut self, destination: T::AccountId, value: T::Balance) -> Result<()>
    where
        T: EnvTypes,
    {
Hero Bird's avatar
Hero Bird committed
397
        self.transfer_impl::<T>(destination, value)
398
399
    }

400
401
402
403
404
405
406
407
408
409
    fn random<T>(&mut self, subject: &[u8]) -> Result<T::Hash>
    where
        T: EnvTypes,
    {
        self.current_block()
            .expect("uninitialized execution context")
            .random::<T>(subject)
            .map_err(Into::into)
    }
}