FR: Estimate deployment costs

[mbrock]

Issue by rainbreak
Thursday Apr 13, 2017 at 11:21 GMT
Originally opened as dapphub/dapp#18

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Easy way to estimate gas costs in deploying a contract, ideally without actually deploying it.

[mbrock]

Comment by reverendus
Thursday Apr 13, 2017 at 19:04 GMT

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Should be easier to implement now as support in seth is coming dapphub/seth#5

[mbrock]

Comment by dbrock
Thursday Apr 13, 2017 at 19:41 GMT

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Maybe we don't need this to be part of dapp now that @Reverendus added the seth feature? @rainbreak what do you think

[mbrock]

Comment by rainbreak
Thursday Apr 13, 2017 at 19:54 GMT

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It would just be sugaring, so you could do

dapp create --estimate MyContract

instead of writing exactly where MyContract is.

[mbrock]

Comment by dbrock
Saturday Apr 15, 2017 at 09:46 GMT

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yeah ok good point

[mbrock]

Comment by rainbreak
Sunday Apr 16, 2017 at 12:06 GMT

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There's another way of doing this that doesn't involve an rpc call:

echo $(($(wc -c < out/MyContract.bin) / 2 * (200 + 68) + 32000 + 32000))

200 is the gas cost per byte for CREATE

68 is the gas cost per byte for non-zero tx data

32000 is the gas cost for a CREATE operation

32000 is the gas cost for a contract creating transaction

I'm probably missing some subtleties, but this should give a pretty good estimation.

[mbrock]

Comment by dbrock
Sunday Apr 16, 2017 at 15:34 GMT

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Interesting...

I guess I prefer doing hde RPC call, lol --- but still...