Files: 000f34b577eb112f2692b0c577052f065087f96c / interface.js
11959 bytesRaw
1 | /** |
2 | * This is the Ethereum interface that is exposed to the WASM instance which |
3 | * enables to interact with the Ethereum Environment |
4 | */ |
5 | const constants = require('./constants.js') |
6 | // const Graph = require('generic-digraph') |
7 | // function.bind is not working corretly whith Wasm imports. So instead create |
8 | // a global for now. TODO REMOVE |
9 | let ENV |
10 | let MOD |
11 | // The interface exposed to the WebAessembly Core |
12 | module.exports = class Interface { |
13 | print (a) { |
14 | console.log(a) |
15 | } |
16 | |
17 | memPrint () { |
18 | console.log((new Uint8Array(MOD.exports.memory)).toString()) |
19 | } |
20 | |
21 | constructor (environment) { |
22 | ENV = this.environment = environment |
23 | } |
24 | |
25 | setModule (mod) { |
26 | this.module = MOD = mod |
27 | } |
28 | |
29 | /** |
30 | * Subtracts an amount to the gas counter |
31 | * @param {integer} amount the amount to subtract to the gas counter |
32 | */ |
33 | useGas (amount) { |
34 | if (amount > 0) { |
35 | ENV.gasLimit -= amount |
36 | } |
37 | } |
38 | |
39 | /** |
40 | * Returns the current amount of gas |
41 | * @return {integer} |
42 | */ |
43 | gas () { |
44 | return ENV.gasLimit |
45 | } |
46 | |
47 | /** |
48 | * Gets address of currently executing account and loads it into memory at |
49 | * the given offset. |
50 | * @param {integer} offset |
51 | */ |
52 | address (offset) { |
53 | const address = ENV.address |
54 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
55 | memory.set(address) |
56 | } |
57 | |
58 | /** |
59 | * Gets balance of the given account and loads it into memory at the given |
60 | * offset. |
61 | * @param {integer} addressOffset the memory offset to laod the address |
62 | * @param {integer} resultOffset |
63 | */ |
64 | balance (addressOffset, offset) { |
65 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
66 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.MAX_BAL_BYTES) |
67 | // call the parent contract and ask for the balance of one of its child contracts |
68 | const balance = ENV.parent.environment.getBalance(address) |
69 | memory.set(balance) |
70 | } |
71 | |
72 | /** |
73 | * Gets the execution's origination address and loads it into memory at the |
74 | * given offset. This is the sender of original transaction; it is never an |
75 | * account with non-empty associated code. |
76 | * @param {integer} offset |
77 | */ |
78 | origin (offset) { |
79 | const origin = ENV.origin |
80 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
81 | memory.set(origin) |
82 | } |
83 | |
84 | /** |
85 | * Gets caller address and loads it into memory at the given offset. This is |
86 | * the address of the account that is directly responsible for this execution. |
87 | * @param {integer} offset |
88 | */ |
89 | caller (offset) { |
90 | const caller = ENV.caller |
91 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
92 | memory.set(caller) |
93 | } |
94 | |
95 | /** |
96 | * Gets the deposited value by the instruction/transaction responsible for |
97 | * this execution and loads it into memory at the given location. |
98 | * @param {integer} offset |
99 | */ |
100 | callValue (offset) { |
101 | const callValue = ENV.callValue |
102 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.MAX_BAL_BYTES) |
103 | memory.set(callValue) |
104 | } |
105 | |
106 | /** |
107 | * Get size of input data in current environment. This pertains to the input |
108 | * data passed with the message call instruction or transaction. |
109 | * @return {integer} |
110 | */ |
111 | callDataSize () { |
112 | return ENV.callData.byteLength |
113 | } |
114 | |
115 | /** |
116 | * Copys the input data in current environment to memory. This pertains to |
117 | * the input data passed with the message call instruction or transaction. |
118 | * @param {integer} offset the offset in memory to load into |
119 | * @param {integer} dataOffset the offset in the input data |
120 | * @param {integer} length the length of data to copy |
121 | */ |
122 | callDataCopy (offset, dataOffset, length) { |
123 | const callData = new Uint8Array(ENV.callData, offset, length) |
124 | const memory = new Uint8Array(MOD.exports.memory, offset, length) |
125 | memory.set(callData) |
126 | } |
127 | |
128 | /** |
129 | * Gets the size of code running in current environment. |
130 | * @return {interger} |
131 | */ |
132 | codeSize () { |
133 | return ENV.code.byteLength |
134 | } |
135 | |
136 | /** |
137 | * Copys the code running in current environment to memory. |
138 | * @param {integer} offset the memory offset |
139 | * @param {integer} codeOffset the code offset |
140 | * @param {integer} length the length of code to copy |
141 | */ |
142 | codeCopy (offset, codeOffset, length) { |
143 | const code = new Uint8Array(ENV.code, codeOffset, length) |
144 | const memory = new Uint8Array(MOD.exports.memory, offset, length) |
145 | memory.set(code) |
146 | } |
147 | |
148 | /** |
149 | * Get size of an account’s code. |
150 | * @param {integer} addressOffset the offset in memory to load the address from |
151 | * @return {integer} |
152 | */ |
153 | extCodeSize (addressOffset) { |
154 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
155 | const code = this.environment.getCode(address) |
156 | return code.byteLength |
157 | } |
158 | |
159 | /** |
160 | * Copys the code of an account to memory. |
161 | * @param {integer} addressOffset the memory offset of the address |
162 | * @param {integer} offset the memory offset |
163 | * @param {integer} codeOffset the code offset |
164 | * @param {integer} length the length of code to copy |
165 | */ |
166 | extCodeCopy (addressOffset, offset, codeOffset, length) { |
167 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
168 | let code = this.environment.getCode(address) |
169 | code = new Uint8Array(code, codeOffset, length) |
170 | const memory = new Uint8Array(MOD.exports.memory, offset, length) |
171 | memory.set(code) |
172 | } |
173 | |
174 | /** |
175 | * Gets price of gas in current environment. |
176 | * @return {integer} |
177 | */ |
178 | gasPrice () { |
179 | return ENV.gasPrice |
180 | } |
181 | |
182 | /** |
183 | * Gets the hash of one of the 256 most recent complete blocks. |
184 | * @param {integer} number which block to load |
185 | * @param {integer} offset the offset to load the hash into |
186 | */ |
187 | blockHash (number, offset) { |
188 | const hash = this.environment.getBlockHash(number) |
189 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
190 | memory.set(hash) |
191 | } |
192 | |
193 | /** |
194 | * Gets the block’s beneficiary address and loads into memory. |
195 | * @param offset |
196 | */ |
197 | coinbase (offset) { |
198 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
199 | memory.set(ENV.coinbase) |
200 | } |
201 | |
202 | /** |
203 | * Get the block’s timestamp. |
204 | * @return {integer} |
205 | */ |
206 | timestamp () { |
207 | return ENV.timestamp |
208 | } |
209 | |
210 | /** |
211 | * Get the block’s number. |
212 | * @return {integer} |
213 | */ |
214 | number () { |
215 | return ENV.number |
216 | } |
217 | |
218 | /** |
219 | * Get the block’s difficulty. |
220 | * @return {integer} |
221 | */ |
222 | difficulty () { |
223 | return ENV.difficulty |
224 | } |
225 | |
226 | /** |
227 | * Get the block’s gas limit. |
228 | * @return {integer} |
229 | */ |
230 | gasLimit () { |
231 | return ENV.gasLimit |
232 | } |
233 | |
234 | /** |
235 | * Creates a new log in the current environment |
236 | * @param {integer} dataOffset the offset in memory to load the memory |
237 | * @param {integer} length the data length |
238 | * TODO: replace with variadic |
239 | */ |
240 | log (dataOffset, length, topic1, topic2, topic3, topic4, topic5) { |
241 | const data = new Uint8Array(MOD.exports.memory, dataOffset, length) |
242 | ENV.logs.push({ |
243 | data: data, |
244 | topics: [topic1, topic2, topic3, topic4, topic5] |
245 | }) |
246 | } |
247 | |
248 | /** |
249 | * Creates a new contract with a given value. |
250 | * @param {integer} valueOffset the offset in memory to the value from |
251 | * @param {integer} dataOffset the offset to load the code for the new contract from |
252 | * @param {integer} length the data length |
253 | */ |
254 | create (valueOffset, dataOffset, length) { |
255 | const value = new Uint8Array(MOD.exports.memory, valueOffset, constants.MAX_BAL_BYTES) |
256 | const data = new Uint8Array(MOD.exports.memory, dataOffset, length) |
257 | const result = ENV.create(value, data) |
258 | return result |
259 | } |
260 | |
261 | /** |
262 | * Sends a message with arbiatary data to a given address path |
263 | * @param {integer} addressOffset the offset to load the address path from |
264 | * @param {integer} valueOffset the offset to load the value from |
265 | * @param {integer} dataOffset the offset to load data from |
266 | * @param {integer} dataLength the length of data |
267 | * @param {integer} resultOffset the offset to store the result data at |
268 | * @param {integer} resultLength |
269 | * @param {integer} gas |
270 | * @return {integer} Returns 1 or 0 depending on if the VM trapped on the message or not |
271 | * TODO: add proper gas counting |
272 | */ |
273 | call (addressOffset, valueOffset, dataOffset, dataLength, resultOffset, resultLength, gas) { |
274 | if (gas === undefined) { |
275 | gas = this.gasLeft() |
276 | } |
277 | // Load the params from mem |
278 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
279 | const value = new Uint8Array(MOD.exports.memory, valueOffset, constants.MAX_BAL_BYTES) |
280 | const data = new Uint8Array(MOD.exports.memory, dataOffset, dataLength) |
281 | // Run the call |
282 | const [result, errorCode] = ENV.call(gas, address, value, data) |
283 | const memory = new Uint8Array(MOD.exports.memory, resultOffset, resultLength) |
284 | memory.set(result) |
285 | |
286 | return errorCode |
287 | } |
288 | |
289 | /** |
290 | * Message-call into this account with an alternative account’s code, but |
291 | * persisting the current values for sender and value. |
292 | * @param {integer} gas |
293 | * @param {integer} addressOffset the offset to load the address path from |
294 | * @param {integer} valueOffset the offset to load the value from |
295 | * @param {integer} dataOffset the offset to load data from |
296 | * @param {integer} dataLength the length of data |
297 | * @param {integer} resultOffset the offset to store the result data at |
298 | * @param {integer} resultLength |
299 | * @return {integer} Returns 1 or 0 depending on if the VM trapped on the message or not |
300 | */ |
301 | callDelegate (gas, addressOffset, dataOffset, dataLength, resultOffset, resultLength) { |
302 | const data = new Uint8Array(MOD.exports.memory, dataOffset, dataLength) |
303 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
304 | const [result, errorCode] = this.environment.callDelegate(gas, address, data) |
305 | const memory = new Uint8Array(MOD.exports.memory, resultOffset, resultLength) |
306 | memory.set(result) |
307 | |
308 | return errorCode |
309 | } |
310 | |
311 | /** |
312 | * store a value at a given path in long term storage which are both loaded |
313 | * from Memory |
314 | * @param {interger} pathOffest the memory offset to load the the path from |
315 | * @param {interger} valueOffset the memory offset to load the value from |
316 | */ |
317 | sstore (pathOffest, valueOffset) { |
318 | const path = new Buffer(MOD.exports.memory, pathOffest, 32).toString('hex') |
319 | const value = new Uint8Array(MOD.exports.memory, valueOffset, 32) |
320 | const oldValue = ENV.state.get(path) |
321 | const valIsZero = value.every((i) => i === 0) |
322 | |
323 | // write |
324 | if (!valIsZero && !oldValue) { |
325 | ENV.gasLimit -= 15000 |
326 | } |
327 | |
328 | // delete |
329 | if (valIsZero && oldValue) { |
330 | ENV.gasRefund += 15000 |
331 | ENV.state.delete(path) |
332 | } else { |
333 | ENV.state.set(path, value) |
334 | } |
335 | } |
336 | |
337 | /** |
338 | * reterives a value at a given path in long term storage |
339 | * @param {interger} pathOffest the memory offset to load the the path from |
340 | * @param {interger} resultOffset the memory offset to load the value from |
341 | */ |
342 | sload (pathOffest, resultOffset) { |
343 | const path = new Buffer(MOD.exports.memory, pathOffest, 32).toString('hex') |
344 | const result = ENV.state.get(path) |
345 | const memory = new Uint8Array(MOD.exports.memory, resultOffset, 32) |
346 | memory.set(result) |
347 | } |
348 | |
349 | /** |
350 | * Halt execution returning output data. |
351 | * @param {integer} offset the offset of the output data. |
352 | * @param {integer} length the length of the output data. |
353 | */ |
354 | return (offset, length) { |
355 | this.environment.returnValue = new Uint8Array(MOD.exports.memory, offset, length) |
356 | } |
357 | |
358 | /** |
359 | * Halt execution and register account for later deletion giving the remaining |
360 | * balance to an address path |
361 | * @param {integer} offset the offset to load the address from |
362 | */ |
363 | suicide (addressOffset) { |
364 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
365 | this.environment.suicideAddress = address |
366 | } |
367 | } |
368 |
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