fix gettransaction when explorers return a bad status code.

Author: fiatjaf

getblock.go

@@ -110,7 +110,7 @@ func getHash(height int64) (hash string, err error) {
 		}
 		defer w.Body.Close()
 
-		if w.StatusCode >= 404 {
+		if w.StatusCode >= 400 {
 			continue
 		}
 

gettransaction.go

@@ -56,6 +56,17 @@ func getTransaction(txid string) (tx TxResponse, err error) {
 		}
 		defer w.Body.Close()
 
+		if w.StatusCode >= 400 {
+			data := make([]byte, 99)
+			n, _ := w.Body.Read(data)
+			message := string(data[0:n])
+			if n >= 99 {
+				message += "…"
+			}
+			err = fmt.Errorf("unexpected response: '%s'", message)
+			continue
+		}
+
 		errW = json.NewDecoder(w.Body).Decode(&tx)
 		if errW != nil {
 			err = errW

main.go

@@ -164,6 +164,7 @@ func main() {
 						p.Logf("failed to get tx %s: %s", txid, err.Error())
 						return UTXOResponse{nil, nil}, 0, nil
 					}
+
 					output := tx.Vout[vout]
 					return UTXOResponse{&output.Value, &output.ScriptPubKey}, 0, nil
 				},