Merge branch 'master' into jae/verifyingcachineprovider

lite/proxy/errors.go

@@ -1,7 +1,7 @@
 package proxy
 
 import (
-	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/pkg/errors"
 )
 
 type errNoData struct{}
@@ -12,13 +12,10 @@ func (e errNoData) Error() string {
 
 // IsErrNoData checks whether an error is due to a query returning empty data
 func IsErrNoData(err error) bool {
-	if err_, ok := err.(cmn.Error); ok {
-		_, ok := err_.Data().(errNoData)
-		return ok
-	}
-	return false
+	_, ok := errors.Cause(err).(errNoData)
+	return ok
 }
 
 func ErrNoData() error {
-	return cmn.ErrorWrap(errNoData{}, "")
+	return errors.Wrap(errNoData{}, "")
 }

lite/proxy/query.go

@@ -4,9 +4,10 @@ import (
 	"fmt"
 	"strings"
 
-	cmn "github.com/tendermint/tendermint/libs/common"
+	"github.com/pkg/errors"
 
 	"github.com/tendermint/tendermint/crypto/merkle"
+	cmn "github.com/tendermint/tendermint/libs/common"
 	"github.com/tendermint/tendermint/lite"
 	lerr "github.com/tendermint/tendermint/lite/errors"
 	rpcclient "github.com/tendermint/tendermint/rpc/client"
@@ -83,7 +84,7 @@ func GetWithProofOptions(prt *merkle.ProofRuntime, path string, key []byte, opts
 		kp = kp.AppendKey(resp.Key, merkle.KeyEncodingURL)
 		err = prt.VerifyValue(resp.Proof, signedHeader.AppHash, kp.String(), resp.Value)
 		if err != nil {
-			return nil, cmn.ErrorWrap(err, "Couldn't verify value proof")
+			return nil, errors.Wrap(err, "Couldn't verify value proof")
 		}
 		return &ctypes.ResultABCIQuery{Response: resp}, nil
 	} else {
@@ -92,7 +93,7 @@ func GetWithProofOptions(prt *merkle.ProofRuntime, path string, key []byte, opts
 		// XXX How do we encode the key into a string...
 		err = prt.VerifyAbsence(resp.Proof, signedHeader.AppHash, string(resp.Key))
 		if err != nil {
-			return nil, cmn.ErrorWrap(err, "Couldn't verify absence proof")
+			return nil, errors.Wrap(err, "Couldn't verify absence proof")
 		}
 		return &ctypes.ResultABCIQuery{Response: resp}, nil
 	}

lite/proxy/query_test.go

@@ -143,13 +143,13 @@ func TestTxProofs(t *testing.T) {
 
 	// First let's make sure a bogus transaction hash returns a valid non-existence proof.
 	key := types.Tx([]byte("bogus")).Hash()
-	res, err := cl.Tx(key, true)
+	_, err = cl.Tx(key, true)
 	require.NotNil(err)
 	require.Contains(err.Error(), "not found")
 
 	// Now let's check with the real tx root hash.
 	key = types.Tx(tx).Hash()
-	res, err = cl.Tx(key, true)
+	res, err := cl.Tx(key, true)
 	require.NoError(err, "%#v", err)
 	require.NotNil(res)
 	keyHash := merkle.SimpleHashFromByteSlices([][]byte{key})