simplify resolve call on wallet node

cmd/resolve.go

@@ -1,7 +1,6 @@
 package cmd
 
 import (
-	"encoding/hex"
 	"encoding/json"
 	"fmt"
 
@@ -29,10 +28,7 @@ func resolveCmd(cmd *cobra.Command, args []string) {
 	err := node.Connect([]string{addr}, nil)
 	checkErr(err)
 
-	output, err := node.Resolve(url)
-	checkErr(err)
-
-	claim, err := node.GetClaimInTx(hex.EncodeToString(rev(output.GetTxHash())), int(output.GetNout()))
+	claim, _, err := node.ResolveToClaim(url)
 	checkErr(err)
 
 	jsonClaim, err := json.MarshalIndent(claim, "", "  ")
@@ -40,11 +36,3 @@ func resolveCmd(cmd *cobra.Command, args []string) {
 
 	fmt.Println(string(jsonClaim))
 }
-
-func rev(b []byte) []byte {
-	r := make([]byte, len(b))
-	for left, right := 0, len(b)-1; left < right; left, right = left+1, right-1 {
-		r[left], r[right] = b[right], b[left]
-	}
-	return r
-}

wallet/client.go

@@ -3,6 +3,7 @@ package wallet
 import (
 	"encoding/base64"
 	"encoding/hex"
+	"strings"
 
 	"github.com/lbryio/chainquery/lbrycrd"
 	"github.com/lbryio/lbry.go/v2/extras/errors"
@@ -14,6 +15,8 @@ import (
 	"github.com/spf13/cast"
 )
 
+var ErrClaimNotFound = errors.Base("claim not found")
+
 // Raw makes a raw wallet server request
 func (n *Node) Raw(method string, params []string, v interface{}) error {
 	return n.request(method, params, v)
@@ -61,6 +64,12 @@ func (n *Node) Resolve(url string) (*types.Output, error) {
 	}
 
 	if e := outputs.GetTxos()[0].GetError(); e != nil {
+		//  TODO: return these errors as real error values so callers don't have to string-match
+		//  https://github.com/lbryio/types/blob/master/v2/proto/result.proto#L45
+		//  UNKNOWN_CODE = 0;
+		//  NOT_FOUND = 1;
+		//  INVALID = 2;
+		//  BLOCKED = 3;
 		return nil, errors.Err("%s: %s", e.GetCode(), e.GetText())
 	}
 
@@ -147,3 +156,28 @@ func (n *Node) GetClaimInTx(txid string, nout int) (*types.Claim, error) {
 
 	return ch.Claim, nil
 }
+
+func (n *Node) ResolveToClaim(url string) (*types.Claim, *types.Output, error) {
+	output, err := n.Resolve(url)
+	if err != nil {
+		if strings.Contains(err.Error(), "NOT_FOUND") {
+			return nil, nil, errors.Err(ErrClaimNotFound)
+		}
+		return nil, nil, err
+	}
+
+	claim, err := n.GetClaimInTx(hex.EncodeToString(rev(output.GetTxHash())), int(output.GetNout()))
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return claim, output, nil
+}
+
+func rev(b []byte) []byte {
+	r := make([]byte, len(b))
+	for left, right := 0, len(b)-1; left < right; left, right = left+1, right-1 {
+		r[left], r[right] = b[right], b[left]
+	}
+	return r
+}

wallet/network.go

@@ -24,7 +24,7 @@ const (
 
 var (
 	ErrNotImplemented   = errors.Base("not implemented")
-	ErrNodeConnected  = errors.Base("node already connected")
+	ErrAlreadyConnected = errors.Base("node already connected")
 	ErrConnectFailed    = errors.Base("failed to connect")
 	ErrTimeout          = errors.Base("timeout")
 )
@@ -35,6 +35,8 @@ type response struct {
 }
 
 type Node struct {
+	ErrFn func(error)
+
 	transport *TCPTransport
 	nextId    atomic.Uint32
 	grp       *stop.Group
@@ -63,7 +65,7 @@ func NewNode() *Node {
 // Connect creates a new connection to the specified address.
 func (n *Node) Connect(addrs []string, config *tls.Config) error {
 	if n.transport != nil {
-		return errors.Err(ErrNodeConnected)
+		return errors.Err(ErrAlreadyConnected)
 	}
 
 	// shuffle addresses for load balancing
@@ -135,10 +137,13 @@ func (n *Node) handleErrors() {
 	}
 }
 
-// err handles errors produced by the foreign node.
-func (n *Node) err(err error) {
-	// TODO: Better error handling.
-	log.Error(errors.FullTrace(err))
+// err handles errors produced by the server
+func (n *Node) err(e error) {
+	if n.ErrFn != nil {
+		n.ErrFn(e)
+	} else {
+		log.Error(errors.FullTrace(e))
+	}
 }
 
 // listen processes messages from the server.