DefaultQueryCtx returns a context with a sensible sanity limit timeout for queries to the eth node.

ExtractRevertReasonFromRPCError attempts to extract the revert reason from the response of an RPC eth_call that reverted by parsing the message from the "data" field ex: kovan (parity) { "error": { "code" : -32015, "data": "Reverted 0xABC123...", "message": "VM execution error." } } // revert reason always omitted rinkeby / ropsten (geth) { "error": { "code": 3, "data": "0x0xABC123...", "message": "execution reverted: hello world" } } // revert reason included in message.

NullClientChainID the ChainID that nullclient will return 0 is never used as a real chain ID so makes sense as a dummy value here.

CallArgs represents the data used to call the balance method of a contract.

[email protected]/rpc/json.go.

NullClient satisfies the Client but has no side effects.

fatal means this transaction can never be accepted even with a different nonce or higher gas price.

Client is the interface used to interact with an ethereum node.

This interface only exists so that we can generate a mock for it.