62 lines
2.1 KiB
Go
62 lines
2.1 KiB
Go
package client
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import (
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"fmt"
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abci "github.com/tendermint/tendermint/abci/types"
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"github.com/cosmos/cosmos-sdk/client"
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"github.com/cosmos/cosmos-sdk/codec"
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clienttypes "github.com/cosmos/cosmos-sdk/x/ibc/02-client/types"
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commitmenttypes "github.com/cosmos/cosmos-sdk/x/ibc/23-commitment/types"
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host "github.com/cosmos/cosmos-sdk/x/ibc/24-host"
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)
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// QueryTendermintProof performs an ABCI query with the given key and returns
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// the value of the query, the proto encoded merkle proof, and the height of
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// the Tendermint block containing the state root. The desired tendermint height
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// 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
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// the correct merkle proof. Proof queries at height less than or equal to 2 are
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// not supported.
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// Issue: https://github.com/cosmos/cosmos-sdk/issues/6567
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func QueryTendermintProof(clientCtx client.Context, key []byte) ([]byte, []byte, clienttypes.Height, 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 clientCtx.Height <= 2 {
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return nil, nil, clienttypes.Height{}, 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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req := abci.RequestQuery{
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Path: fmt.Sprintf("store/%s/key", host.StoreKey),
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Height: height,
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Data: key,
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Prove: true,
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}
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res, err := clientCtx.QueryABCI(req)
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if err != nil {
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return nil, nil, clienttypes.Height{}, err
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}
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merkleProof := commitmenttypes.MerkleProof{
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Proof: res.ProofOps,
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}
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cdc := codec.NewProtoCodec(clientCtx.InterfaceRegistry)
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proofBz, err := cdc.MarshalBinaryBare(&merkleProof)
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if err != nil {
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return nil, nil, clienttypes.Height{}, err
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}
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epoch := clienttypes.ParseChainID(clientCtx.ChainID)
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return res.Value, proofBz, clienttypes.NewHeight(epoch, uint64(res.Height)+1), nil
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}
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