Better error messages for alert providers

internal/notifier/alertmanager.go

@@ -40,7 +40,7 @@ type AlertManagerAlert struct {
 func NewAlertmanager(hookURL string, proxyURL string, certPool *x509.CertPool) (*Alertmanager, error) {
 	_, err := url.ParseRequestURI(hookURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid Alertmanager URL %s", hookURL)
+		return nil, fmt.Errorf("invalid Alertmanager URL %s: '%w'", hookURL, err)
 	}
 
 	return &Alertmanager{

internal/notifier/discord.go

@@ -37,7 +37,7 @@ type Discord struct {
 func NewDiscord(hookURL string, proxyURL string, username string, channel string) (*Discord, error) {
 	webhook, err := url.ParseRequestURI(hookURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid Discord hook URL %s", hookURL)
+		return nil, fmt.Errorf("invalid Discord hook URL %s: '%w'", hookURL, err)
 	}
 
 	// use Slack formatting

internal/notifier/matrix.go

@@ -28,7 +28,7 @@ type MatrixPayload struct {
 func NewMatrix(serverURL, token, roomId string, certPool *x509.CertPool) (*Matrix, error) {
 	_, err := url.ParseRequestURI(serverURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid Matrix homeserver URL %s", serverURL)
+		return nil, fmt.Errorf("invalid Matrix homeserver URL %s: '%w'", serverURL, err)
 	}
 
 	return &Matrix{

internal/notifier/opsgenie.go

@@ -42,7 +42,7 @@ type OpsgenieAlert struct {
 func NewOpsgenie(hookURL string, proxyURL string, certPool *x509.CertPool, token string) (*Opsgenie, error) {
 	_, err := url.ParseRequestURI(hookURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid Opsgenie hook URL %s", hookURL)
+		return nil, fmt.Errorf("invalid Opsgenie hook URL %s: '%w'", hookURL, err)
 	}
 
 	if token == "" {

internal/notifier/rocket.go

@@ -39,7 +39,7 @@ type Rocket struct {
 func NewRocket(hookURL string, proxyURL string, certPool *x509.CertPool, username string, channel string) (*Rocket, error) {
 	_, err := url.ParseRequestURI(hookURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid Rocket hook URL %s", hookURL)
+		return nil, fmt.Errorf("invalid Rocket hook URL %s: '%w'", hookURL, err)
 	}
 
 	if username == "" {

internal/notifier/slack.go

@@ -65,7 +65,7 @@ type SlackField struct {
 func NewSlack(hookURL string, proxyURL string, token string, certPool *x509.CertPool, username string, channel string) (*Slack, error) {
 	_, err := url.ParseRequestURI(hookURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid Slack hook URL %s", hookURL)
+		return nil, fmt.Errorf("invalid Slack hook URL %s: '%w'", hookURL, err)
 	}
 
 	return &Slack{

internal/notifier/teams.go

@@ -57,7 +57,7 @@ type MSTeamsField struct {
 func NewMSTeams(hookURL string, proxyURL string, certPool *x509.CertPool) (*MSTeams, error) {
 	_, err := url.ParseRequestURI(hookURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid MS Teams webhook URL %s", hookURL)
+		return nil, fmt.Errorf("invalid MS Teams webhook URL %s: '%w'", hookURL, err)
 	}
 
 	return &MSTeams{

internal/notifier/webex.go

@@ -66,7 +66,7 @@ func NewWebex(hookURL, proxyURL string, certPool *x509.CertPool, channel string,
 
 	_, err := url.ParseRequestURI(hookURL)
 	if err != nil {
-		return nil, fmt.Errorf("invalid Webex hook URL %s", hookURL)
+		return nil, fmt.Errorf("invalid Webex hook URL %s: '%w'", hookURL, err)
 	}
 
 	return &Webex{