From: Conor Broderick <conor.broderick@robustperception.io>
Date: Mon, 10 Jul 2017 16:14:06 +0000 (+0100)
Subject: Log tcp errors (#188)
X-Git-Url: https://vcs.fsf.org/?a=commitdiff_plain;h=b195fd4ecb7611a47a2b6bdce5bb49d1a2ccebf9;p=blackbox_exporter.git

Log tcp errors (#188)
---

diff --git a/tcp.go b/tcp.go
index 3a1ac2f..d823f42 100644
--- a/tcp.go
+++ b/tcp.go
@@ -32,11 +32,13 @@ func dialTCP(target string, module Module, registry *prometheus.Registry) (net.C
 
 	targetAddress, port, err := net.SplitHostPort(target)
 	if err != nil {
+		log.Errorf("Error splitting target address and port: %v", err)
 		return nil, err
 	}
 
 	ip, err := chooseProtocol(module.TCP.PreferredIPProtocol, targetAddress, registry)
 	if err != nil {
+		log.Errorf("Error choosing protocol: %v", err)
 		return nil, err
 	}
 
@@ -52,6 +54,7 @@ func dialTCP(target string, module Module, registry *prometheus.Registry) (net.C
 	}
 	tlsConfig, err := config.NewTLSConfig(&module.TCP.TLSConfig)
 	if err != nil {
+		log.Errorf("Error creating TLS configuration: %v", err)
 		return nil, err
 	}
 	return tls.DialWithDialer(dialer, dialProtocol, dialTarget, tlsConfig)
@@ -66,6 +69,7 @@ func probeTCP(target string, module Module, registry *prometheus.Registry) bool
 	deadline := time.Now().Add(module.Timeout)
 	conn, err := dialTCP(target, module, registry)
 	if err != nil {
+		log.Errorf("Error dialing TCP: %v", err)
 		return false
 	}
 	defer conn.Close()
@@ -74,6 +78,7 @@ func probeTCP(target string, module Module, registry *prometheus.Registry) bool
 	// If a deadline cannot be set, better fail the probe by returning an error
 	// now rather than blocking forever.
 	if err := conn.SetDeadline(deadline); err != nil {
+		log.Errorf("Error setting deadline: %v", err)
 		return false
 	}
 	if module.TCP.TLS {