Merge pull request #138 from mysteriumnetwork/generic-timeout-check

Add a generic func to check if error is a failure to reach BC

client/bc.go

@@ -19,7 +19,9 @@ package client
 
 import (
 	"context"
+	"errors"
 	"math/big"
+	"net"
 	"time"
 
 	"github.com/ethereum/go-ethereum"
@@ -192,6 +194,25 @@ type EtherClient interface {
 	SendTransaction(ctx context.Context, tx *types.Transaction) error
 }
 
+// IsErrConnectionFailed returns true if the error represents
+// a failure to reach blockchain client.
+func IsErrConnectionFailed(err error) bool {
+	if errors.Is(err, context.DeadlineExceeded) {
+		return true
+	}
+
+	if errors.Is(err, context.Canceled) {
+		return true
+	}
+
+	var e net.Error
+	if errors.As(err, &e) {
+		return e.Timeout()
+	}
+
+	return false
+}
+
 // EthClientGetter wraps any eth client.
 type EthClientGetter interface {
 	// Client returns a client to use for making call to the eth blockchain.