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query.go
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query.go
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package client
import (
"context"
"fmt"
"strings"
"github.com/pkg/errors"
abci "github.com/tendermint/tendermint/abci/types"
tmbytes "github.com/tendermint/tendermint/libs/bytes"
rpcclient "github.com/tendermint/tendermint/rpc/client"
"github.com/cosmos/cosmos-sdk/store/rootmulti"
sdk "github.com/cosmos/cosmos-sdk/types"
)
// GetNode returns an RPC client. If the context's client is not defined, an
// error is returned.
func (ctx Context) GetNode() (rpcclient.Client, error) {
if ctx.Client == nil {
return nil, errors.New("no RPC client is defined in offline mode")
}
return ctx.Client, nil
}
// Query performs a query to a Tendermint node with the provided path.
// It returns the result and height of the query upon success or an error if
// the query fails.
func (ctx Context) Query(path string) ([]byte, int64, error) {
return ctx.query(path, nil)
}
// QueryWithData performs a query to a Tendermint node with the provided path
// and a data payload. It returns the result and height of the query upon success
// or an error if the query fails.
func (ctx Context) QueryWithData(path string, data []byte) ([]byte, int64, error) {
return ctx.query(path, data)
}
// QueryStore performs a query to a Tendermint node with the provided key and
// store name. It returns the result and height of the query upon success
// or an error if the query fails.
func (ctx Context) QueryStore(key tmbytes.HexBytes, storeName string) ([]byte, int64, error) {
return ctx.queryStore(key, storeName, "key")
}
// QueryABCI performs a query to a Tendermint node with the provide RequestQuery.
// It returns the ResultQuery obtained from the query.
func (ctx Context) QueryABCI(req abci.RequestQuery) (abci.ResponseQuery, error) {
return ctx.queryABCI(req)
}
// GetFromAddress returns the from address from the context's name.
func (ctx Context) GetFromAddress() sdk.AccAddress {
return ctx.FromAddress
}
// GetFeeGranterAddress returns the fee granter address from the context
func (ctx Context) GetFeeGranterAddress() sdk.AccAddress {
return ctx.FeeGranter
}
// GetFromName returns the key name for the current context.
func (ctx Context) GetFromName() string {
return ctx.FromName
}
func (ctx Context) queryABCI(req abci.RequestQuery) (abci.ResponseQuery, error) {
node, err := ctx.GetNode()
if err != nil {
return abci.ResponseQuery{}, err
}
opts := rpcclient.ABCIQueryOptions{
Height: ctx.Height,
Prove: req.Prove,
}
result, err := node.ABCIQueryWithOptions(context.Background(), req.Path, req.Data, opts)
if err != nil {
return abci.ResponseQuery{}, err
}
if !result.Response.IsOK() {
return abci.ResponseQuery{}, errors.New(result.Response.Log)
}
// data from trusted node or subspace query doesn't need verification
if !opts.Prove || !isQueryStoreWithProof(req.Path) {
return result.Response, nil
}
return result.Response, nil
}
// query performs a query to a Tendermint node with the provided store name
// and path. It returns the result and height of the query upon success
// or an error if the query fails.
func (ctx Context) query(path string, key tmbytes.HexBytes) ([]byte, int64, error) {
resp, err := ctx.queryABCI(abci.RequestQuery{
Path: path,
Data: key,
})
if err != nil {
return nil, 0, err
}
return resp.Value, resp.Height, nil
}
// queryStore performs a query to a Tendermint node with the provided a store
// name and path. It returns the result and height of the query upon success
// or an error if the query fails.
func (ctx Context) queryStore(key tmbytes.HexBytes, storeName, endPath string) ([]byte, int64, error) {
path := fmt.Sprintf("/store/%s/%s", storeName, endPath)
return ctx.query(path, key)
}
// isQueryStoreWithProof expects a format like /<queryType>/<storeName>/<subpath>
// queryType must be "store" and subpath must be "key" to require a proof.
func isQueryStoreWithProof(path string) bool {
if !strings.HasPrefix(path, "/") {
return false
}
paths := strings.SplitN(path[1:], "/", 3)
switch {
case len(paths) != 3:
return false
case paths[0] != "store":
return false
case rootmulti.RequireProof("/" + paths[2]):
return true
}
return false
}