2021-04-17 10:00:07 +00:00
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package types
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import (
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"fmt"
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2021-04-18 16:39:15 +00:00
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"github.com/cosmos/cosmos-sdk/types/tx"
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2021-04-17 10:00:07 +00:00
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abci "github.com/tendermint/tendermint/abci/types"
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"github.com/tendermint/tendermint/proto/tendermint/crypto"
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"github.com/cosmos/cosmos-sdk/client"
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2021-06-22 10:49:18 +00:00
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evmtypes "github.com/tharsis/ethermint/x/evm/types"
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2021-04-17 10:00:07 +00:00
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)
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// QueryClient defines a gRPC Client used for:
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// - Transaction simulation
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// - EVM module queries
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type QueryClient struct {
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tx.ServiceClient
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evmtypes.QueryClient
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}
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// NewQueryClient creates a new gRPC query client
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func NewQueryClient(clientCtx client.Context) *QueryClient { // nolint: interfacer
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return &QueryClient{
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ServiceClient: tx.NewServiceClient(clientCtx),
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QueryClient: evmtypes.NewQueryClient(clientCtx),
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}
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}
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// GetProof performs an ABCI query with the given key and returns a merkle proof. The desired
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// tendermint height to perform the query should be set in the client context. The query will be
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// performed at one below this height (at the IAVL version) in order to obtain the correct merkle
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// proof. Proof queries at height less than or equal to 2 are not supported.
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// Issue: https://github.com/cosmos/cosmos-sdk/issues/6567
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func (QueryClient) GetProof(clientCtx client.Context, storeKey string, key []byte) ([]byte, *crypto.ProofOps, error) {
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height := clientCtx.Height
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// ABCI queries at height less than or equal to 2 are not supported.
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// Base app does not support queries for height less than or equal to 1.
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// Therefore, a query at height 2 would be equivalent to a query at height 3
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if height <= 2 {
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return nil, nil, fmt.Errorf("proof queries at height <= 2 are not supported")
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}
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// Use the IAVL height if a valid tendermint height is passed in.
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height--
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abciReq := abci.RequestQuery{
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Path: fmt.Sprintf("store/%s/key", storeKey),
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Data: key,
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Height: height,
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Prove: true,
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}
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abciRes, err := clientCtx.QueryABCI(abciReq)
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if err != nil {
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return nil, nil, err
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}
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return abciRes.Value, abciRes.ProofOps, nil
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}
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