Files: 0edfe5b10a3a58691d782ae18e443689a66cf95d / interface.js
11684 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 | |
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 | |
14 | debugPrint (a) { |
15 | console.log(a) |
16 | } |
17 | |
18 | memPrint () { |
19 | console.log((new Uint8Array(MOD.exports.memory)).toString()) |
20 | } |
21 | |
22 | constructor (environment) { |
23 | ENV = this.environment = environment |
24 | } |
25 | |
26 | setModule (mod) { |
27 | this.module = MOD = mod |
28 | } |
29 | |
30 | /** |
31 | * Subtracts an amount to the gas counter |
32 | * @param {integer} amount the amount to subtract to the gas counter |
33 | */ |
34 | addGas (amount) { |
35 | if (amount > 0) { |
36 | ENV.gasCounter += amount |
37 | } |
38 | } |
39 | |
40 | /** |
41 | * Returns the current gasCounter |
42 | * @return {integer} |
43 | */ |
44 | gasUsed () { |
45 | return ENV.gasCounter |
46 | } |
47 | |
48 | /** |
49 | * Returns the current gasCounter |
50 | * @return {integer} |
51 | */ |
52 | gasLeft () { |
53 | return ENV.gas - ENV.gasCounter |
54 | } |
55 | |
56 | /** |
57 | * Gets address of currently executing account and loads it into memory at |
58 | * the given offset. |
59 | * @param {integer} offset |
60 | */ |
61 | address (offset) { |
62 | const address = ENV.address |
63 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
64 | memory.set(address) |
65 | } |
66 | |
67 | /** |
68 | * Gets balance of the given account and loads it into memory at the given |
69 | * offset. |
70 | * @param {integer} addressOffset the memory offset to laod the address |
71 | * @param {integer} resultOffset |
72 | */ |
73 | balance (addressOffset, offset) { |
74 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
75 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.MAX_BAL_BYTES) |
76 | const balance = ENV.getBalance(address) |
77 | memory.set(balance) |
78 | } |
79 | |
80 | /** |
81 | * Gets the execution's origination address and loads it into memory at the |
82 | * given offset. This is the sender of original transaction; it is never an |
83 | * account with non-empty associated code. |
84 | * @param {integer} offset |
85 | */ |
86 | origin (offset) { |
87 | const origin = ENV.origin |
88 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
89 | memory.set(origin) |
90 | } |
91 | |
92 | /** |
93 | * Gets caller address and loads it into memory at the given offset. This is |
94 | * the address of the account that is directly responsible for this execution. |
95 | * @param {integer} offset |
96 | */ |
97 | caller (offset) { |
98 | const caller = ENV.caller |
99 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
100 | memory.set(caller) |
101 | } |
102 | |
103 | /** |
104 | * Gets the deposited value by the instruction/transaction responsible for |
105 | * this execution and loads it into memory at the given location. |
106 | * @param {integer} offset |
107 | */ |
108 | callValue (offset) { |
109 | const callValue = ENV.callValue |
110 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.MAX_BAL_BYTES) |
111 | memory.set(callValue) |
112 | } |
113 | |
114 | /** |
115 | * Get size of input data in current environment. This pertains to the input |
116 | * data passed with the message call instruction or transaction. |
117 | * @return {integer} |
118 | */ |
119 | callDataSize () { |
120 | return ENV.callData.byteLength |
121 | } |
122 | |
123 | /** |
124 | * Copys the input data in current environment to memory. This pertains to |
125 | * the input data passed with the message call instruction or transaction. |
126 | * @param {integer} offset the offset in memory to load into |
127 | * @param {integer} dataOffset the offset in the input data |
128 | * @param {integer} length the length of data to copy |
129 | */ |
130 | callDataCopy (offset, dataOffset, length) { |
131 | const callData = new Uint8Array(ENV.callData, offset, length) |
132 | const memory = new Uint8Array(MOD.exports.memory, offset, length) |
133 | memory.set(callData) |
134 | } |
135 | |
136 | /** |
137 | * Gets the size of code running in current environment. |
138 | * @return {interger} |
139 | */ |
140 | codeSize () { |
141 | return ENV.code.byteLength |
142 | } |
143 | |
144 | /** |
145 | * Copys the code running in current environment to memory. |
146 | * @param {integer} offset the memory offset |
147 | * @param {integer} codeOffset the code offset |
148 | * @param {integer} length the length of code to copy |
149 | */ |
150 | codeCopy (offset, codeOffset, length) { |
151 | const code = new Uint8Array(ENV.code, codeOffset, length) |
152 | const memory = new Uint8Array(MOD.exports.memory, offset, length) |
153 | memory.set(code) |
154 | } |
155 | |
156 | /** |
157 | * Get size of an account’s code. |
158 | * @param {integer} addressOffset the offset in memory to load the address from |
159 | * @return {integer} |
160 | */ |
161 | extCodeSize (addressOffset) { |
162 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
163 | const code = this.environment.getCode(address) |
164 | return code.byteLength |
165 | } |
166 | |
167 | /** |
168 | * Copys the code of an account to memory. |
169 | * @param {integer} addressOffset the memory offset of the address |
170 | * @param {integer} offset the memory offset |
171 | * @param {integer} codeOffset the code offset |
172 | * @param {integer} length the length of code to copy |
173 | */ |
174 | extCodeCopy (addressOffset, offset, codeOffset, length) { |
175 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
176 | let code = this.environment.getCode(address) |
177 | code = new Uint8Array(code, codeOffset, length) |
178 | const memory = new Uint8Array(MOD.exports.memory, offset, length) |
179 | memory.set(code) |
180 | } |
181 | |
182 | /** |
183 | * Gets price of gas in current environment. |
184 | * @return {integer} |
185 | */ |
186 | gasPrice () { |
187 | return ENV.gasPrice |
188 | } |
189 | |
190 | /** |
191 | * Gets the hash of one of the 256 most recent complete blocks. |
192 | * @param {integer} number which block to load |
193 | * @param {integer} offset the offset to load the hash into |
194 | */ |
195 | blockHash (number, offset) { |
196 | const hash = this.environment.getBlockHash(number) |
197 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
198 | memory.set(hash) |
199 | } |
200 | |
201 | /** |
202 | * Gets the block’s beneficiary address and loads into memory. |
203 | * @param offset |
204 | */ |
205 | coinbase (offset) { |
206 | const memory = new Uint8Array(MOD.exports.memory, offset, constants.ADD_SIZE_BYTES) |
207 | memory.set(ENV.coinbase) |
208 | } |
209 | |
210 | /** |
211 | * Get the block’s timestamp. |
212 | * @return {integer} |
213 | */ |
214 | timestamp () { |
215 | return ENV.timestamp |
216 | } |
217 | |
218 | /** |
219 | * Get the block’s number. |
220 | * @return {integer} |
221 | */ |
222 | number () { |
223 | return ENV.number |
224 | } |
225 | |
226 | /** |
227 | * Get the block’s difficulty. |
228 | * @return {integer} |
229 | */ |
230 | difficulty () { |
231 | return ENV.difficulty |
232 | } |
233 | |
234 | /** |
235 | * Get the block’s gas limit. |
236 | * @return {integer} |
237 | */ |
238 | gasLimit () { |
239 | return ENV.gasLimit |
240 | } |
241 | |
242 | /** |
243 | * Creates a new log in the current environment |
244 | * @param {integer} dataOffset the offset in memory to load the memory |
245 | * @param {integer} length the data length |
246 | * TODO: replace with variadic |
247 | */ |
248 | log (dataOffset, length, topic1, topic2, topic3, topic4, topic5) { |
249 | const data = new Uint8Array(MOD.exports.memory, dataOffset, length) |
250 | ENV.logs.push({ |
251 | data: data, |
252 | topics: [topic1, topic2, topic3, topic4, topic5] |
253 | }) |
254 | } |
255 | |
256 | /** |
257 | * Creates a new contract with a given value. |
258 | * @param {integer} valueOffset the offset in memory to the value from |
259 | * @param {integer} dataOffset the offset to load the code for the new contract from |
260 | * @param {integer} length the data length |
261 | */ |
262 | create (valueOffset, dataOffset, length) { |
263 | const value = new Uint8Array(MOD.exports.memory, valueOffset, constants.MAX_BAL_BYTES) |
264 | const data = new Uint8Array(MOD.exports.memory, dataOffset, length) |
265 | const result = ENV.create(value, data) |
266 | return result |
267 | } |
268 | |
269 | /** |
270 | * Sends a message with arbiatary data to a given address path |
271 | * @param {integer} addressOffset the offset to load the address path from |
272 | * @param {integer} valueOffset the offset to load the value from |
273 | * @param {integer} dataOffset the offset to load data from |
274 | * @param {integer} dataLength the length of data |
275 | * @param {integer} resultOffset the offset to store the result data at |
276 | * @param {integer} resultLength |
277 | * @param {integer} gas |
278 | * @return {integer} Returns 1 or 0 depending on if the VM trapped on the message or not |
279 | * TODO: add proper gas counting |
280 | */ |
281 | call (addressOffset, valueOffset, dataOffset, dataLength, resultOffset, resultLength, gas) { |
282 | if (gas === undefined) { |
283 | gas = this.gasLeft() |
284 | } |
285 | // Load the params from mem |
286 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
287 | const value = new Uint8Array(MOD.exports.memory, valueOffset, constants.MAX_BAL_BYTES) |
288 | const data = new Uint8Array(MOD.exports.memory, dataOffset, dataLength) |
289 | // Run the call |
290 | const [result, errorCode] = ENV.call(gas, address, value, data) |
291 | const memory = new Uint8Array(MOD.exports.memory, resultOffset, resultLength) |
292 | memory.set(result) |
293 | |
294 | return errorCode |
295 | } |
296 | |
297 | /** |
298 | * Message-call into this account with an alternative account’s code, but |
299 | * persisting the current values for sender and value. |
300 | * @param {integer} gas |
301 | * @param {integer} addressOffset the offset to load the address path from |
302 | * @param {integer} valueOffset the offset to load the value from |
303 | * @param {integer} dataOffset the offset to load data from |
304 | * @param {integer} dataLength the length of data |
305 | * @param {integer} resultOffset the offset to store the result data at |
306 | * @param {integer} resultLength |
307 | * @return {integer} Returns 1 or 0 depending on if the VM trapped on the message or not |
308 | */ |
309 | callDelegate (gas, addressOffset, dataOffset, dataLength, resultOffset, resultLength) { |
310 | const data = new Uint8Array(MOD.exports.memory, dataOffset, dataLength) |
311 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
312 | const [result, errorCode] = this.environment.callDelegate(gas, address, data) |
313 | const memory = new Uint8Array(MOD.exports.memory, resultOffset, resultLength) |
314 | memory.set(result) |
315 | |
316 | return errorCode |
317 | } |
318 | |
319 | /** |
320 | * store a value at a given path in long term storage which are both loaded |
321 | * from Memory |
322 | * @param {interger} pathOffest the memory offset to load the the path from |
323 | * @param {interger} valueOffset the memory offset to load the value from |
324 | */ |
325 | sstore (pathOffest, valueOffset) { |
326 | const path = new Uint8Array(MOD.exports.memory, pathOffest, pathOffest + 32) |
327 | const value = new Uint8Array(MOD.exports.memory, valueOffset, valueOffset + 32) |
328 | ENV.state.set(path, value) |
329 | } |
330 | |
331 | /** |
332 | * reterives a value at a given path in long term storage |
333 | * @param {interger} pathOffest the memory offset to load the the path from |
334 | * @param {interger} resultOffset the memory offset to load the value from |
335 | */ |
336 | sload (pathOffest, resultOffset) { |
337 | const path = new Uint8Array(MOD.exports.memory, pathOffest, pathOffest + 32) |
338 | const result = ENV.state.getValue(path) |
339 | const memory = new Uint8Array(MOD.exports.memory, resultOffset, resultOffset + 32) |
340 | memory.set(result) |
341 | } |
342 | |
343 | /** |
344 | * Halt execution returning output data. |
345 | * @param {integer} offset the offset of the output data. |
346 | * @param {integer} length the length of the output data. |
347 | */ |
348 | return (offset, length) { |
349 | this.environment.returnValue = new Uint8Array(MOD.exports.memory, offset, length) |
350 | } |
351 | |
352 | /** |
353 | * Halt execution and register account for later deletion giving the remaining |
354 | * balance to an address path |
355 | * @param {integer} offset the offset to load the address from |
356 | */ |
357 | suicide (addressOffset) { |
358 | const address = new Uint8Array(MOD.exports.memory, addressOffset, constants.ADD_SIZE_BYTES) |
359 | this.environment.suicideAddress = address |
360 | } |
361 | } |
362 |
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