fix(cosmos): ensure simulated transactions can't trigger SwingSet #3740
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michaelfig
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The former pattern of `vm.IsSimulation` was too brittle to handle our migration to the GRPC-based transaction handlers. Instead, intercept the actual invocation of CallToController and prevent it from running anything in SwingSet if in simulation mode. Also, make sure our InfiniteGasMeter is only assigned once, so that if we ever do Cosmos-level metering of SwingSet downcalls, there is only one place to adjust.
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dckc
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michaelfig
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fix(cosmos): ensure simulated transactions can't trigger SwingSet
JimLarson
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Aug 21, 2021
| @@ -23,7 +23,7 @@ func NewStorageHandler(keeper Keeper) storageHandler { | |||
| return storageHandler{keeper: keeper} | |||
| } | |||
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| func (sh storageHandler) Receive(ctx *vm.ControllerContext, str string) (ret string, err error) { | |||
| func (sh storageHandler) Receive(cctx *vm.ControllerContext, str string) (ret string, err error) { | |||
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I've been using ctlCtx, e.g. in vbank_test.go, so we should use one of the two names consistently (I don't care which). Might save some clutter below by extracting ctx := ctlCtx.Context at the top.
| callToController := func(ctx sdk.Context, str, simReturn string) (string, error) { | ||
| if vm.IsSimulation(ctx) { | ||
| // Just return the simReturn, since the message is being simulated. | ||
| return simReturn, nil |
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It sure looks like simReturn is always the empty string. If so, you can avoid the extra arg to callToController and avoid a lot of changes.
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Closes #3739
The former pattern of
vm.IsSimulationwas too brittle to handleour migration to the GRPC-based transaction handlers. Instead,
intercept the actual invocation of CallToController and prevent
it from running anything in SwingSet if in simulation mode.
Also, make sure our InfiniteGasMeter is only assigned once, so
that if we ever do Cosmos-level metering of SwingSet downcalls,
there is only one place to adjust.