Merge pull request #35 from sei-protocol/multi-estimate

Add DoEstimateGasAfterCalls

lib/ethapi/api.go

@@ -1219,6 +1219,45 @@ func DoEstimateGas(ctx context.Context, b Backend, args TransactionArgs, blockNr
 	return hexutil.Uint64(estimate), nil
 }
 
+func DoEstimateGasAfterCalls(ctx context.Context, b Backend, args TransactionArgs, calls []TransactionArgs, blockNrOrHash rpc.BlockNumberOrHash, overrides *StateOverride, timeout time.Duration, gasCap uint64) (hexutil.Uint64, error) {
+	state, header, err := b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)
+	if state == nil || err != nil {
+		return 0, err
+	}
+	for _, call := range calls {
+		_, err = doCall(ctx, b, call, state, header, overrides, nil, timeout, gasCap)
+		if err != nil {
+			return 0, err
+		}
+		overrides = nil
+	}
+	// Construct the gas estimator option from the user input
+	opts := &gasestimator.Options{
+		Config:     b.ChainConfig(),
+		Chain:      NewChainContext(ctx, b),
+		Header:     header,
+		State:      state,
+		ErrorRatio: estimateGasErrorRatio,
+	}
+
+	if err := args.CallDefaults(gasCap, header.BaseFee, b.ChainConfig().ChainID); err != nil {
+		return 0, err
+	}
+	call := args.ToMessage(header.BaseFee)
+	if err != nil {
+		return 0, err
+	}
+	// Run the gas estimation andwrap any revertals into a custom return
+	estimate, revert, err := gasestimator.Estimate(ctx, call, opts, gasCap)
+	if err != nil {
+		if len(revert) > 0 {
+			return 0, newRevertError(revert)
+		}
+		return 0, err
+	}
+	return hexutil.Uint64(estimate), nil
+}
+
 // EstimateGas returns the lowest possible gas limit that allows the transaction to run
 // successfully at block `blockNrOrHash`, or the latest block if `blockNrOrHash` is unspecified. It
 // returns error if the transaction would revert or if there are unexpected failures. The returned