Invalid simulation query on v0.40.1

[nhannamsiu]

Summary of Bug

client/tx.go calculateGas() uses query path /cosmos.tx.v1beta1.Service/Simulate to simulate the transaction. This query is routed to baseapp/abci.go Query(), which slipped through all cases and returned unknown query path.

Looks like it's work in progress though

// TODO This should use the generated tx service Client.
// https://github.com/cosmos/cosmos-sdk/issues/7726
bz, _, err := queryFunc("/cosmos.tx.v1beta1.Service/Simulate", txBytes)

A guide showing how to generate the tx service Client here would be very helpful.

Version

v0.40.1

Steps to Reproduce

1. Follow the tutorial to setup basic app using cosmos v0.40.1.
2. Make use of client/tx/tx.go broadcastTx(), which includes the calulateGas() and the error will show up.
3. Sorry for vague description as our setup is complex, involves 3 repos to reproduce it and they are all private. We did our best to isolate the cause and hope others having same problem find this helpful.

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For Admin Use

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[clevinson]

Assigning to @amaurymartiny to take a look at as you were the author of the referenced issue.