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how to use evm_snapshot about ganache-cli-archive HOT 3 CLOSED

trufflesuite commented on August 15, 2024

how to use evm_snapshot

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Comments (3)

tcoulter commented on August 15, 2024

Hi @wighawag - quick question. Are you using this with Truffle?

Either way, you'd want to do something like this after setting the provider:

web3.currentProvider.sendAsync({
  jsonrpc: "2.0",
  method: "evm_snapshot",
  id: 12345
}, function(err, result) {
  // this is your callback
});

The reason you have to do this is because evm_snapshot is a non-standard method and web3 does not provide an interface for it.

Aside: The provider interface exists on the TestRPC as well, which, depending on your context may simplify a few things for you:

var TestRPC = require("ethereumjs-testrpc");

before(function(done){
    web3.setProvider(new TestRPC.provider()));
    done();
})

Going to close this as unfortunately there's no way around this syntax given the relationship between providers and web3 proper.

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wighawag commented on August 15, 2024

Thanks for the quick reply, I am using it without anything except just node and mocha

using sendAsync I get the same error :

 Uncaught AssertionError: null == true
      at Object.callback (test/index.js:142:8)
      at node_modules/web3/lib/web3/method.js:142:25
      at node_modules/web3/lib/web3/requestmanager.js:89:9
      at Web3ProviderEngine._inspectResponseForNewBlock (node_modules/web3-provider-engine/index.js:217:12)
      at node_modules/web3-provider-engine/index.js:127:14
      at node_modules/async/lib/async.js:52:16
      at node_modules/async/lib/async.js:269:32
      at node_modules/async/lib/async.js:44:16
      at async.eachSeries.resultObj.id (node_modules/web3-provider-engine/index.js:108:9)
      at node_modules/async/lib/async.js:181:20
      at Immediate.iterate [as _onImmediate] (node_modules/async/lib/async.js:262:13)

but I can now see the log mentionning the snapshot saving and restore.