Read the gateway from stack.yaml in logs

deploy, describe and list all resolve the gateway from the stack file
before falling back to the default, but logs passed an empty string for
the YAML gateway and so always fell back to http://127.0.0.1:8080.

Against a remote gateway this meant logs quietly queried localhost and
reported the result as "Unauthorized access, run faas-cli login", which
reads as an expired token or a missing permission rather than a gateway
mix-up. Passing -f stack.yaml did not help.

Resolve the YAML gateway the same way describe does. Explicit --gateway
and OPENFAAS_URL continue to take precedence.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Author: alexellis

commands/logs.go

@@ -16,6 +16,7 @@ import (
 	"github.com/openfaas/faas-provider/logs"
 
 	"github.com/openfaas/faas-cli/proxy"
+	"github.com/openfaas/go-sdk/stack"
 	"github.com/spf13/cobra"
 )
 
@@ -92,7 +93,22 @@ func initLogCmdFlags(cmd *cobra.Command) {
 
 func runLogs(cmd *cobra.Command, args []string) error {
 
-	gatewayAddress := getGatewayURL(gateway, defaultGateway, "", os.Getenv(openFaaSURLEnvironment))
+	// Honour the gateway set in stack.yaml, as deploy, describe and list do,
+	// otherwise this falls back to localhost and reports the resulting failure
+	// as an authentication error against the wrong gateway.
+	var yamlGateway string
+	if len(yamlFile) > 0 {
+		parsedServices, err := stack.ParseYAMLFile(yamlFile, regex, filter, envsubst)
+		if err != nil {
+			return err
+		}
+
+		if parsedServices != nil {
+			yamlGateway = parsedServices.Provider.GatewayURL
+		}
+	}
+
+	gatewayAddress := getGatewayURL(gateway, defaultGateway, yamlGateway, os.Getenv(openFaaSURLEnvironment))
 	jsonLogs := jsonOutput || logFlagValues.logFormat == flags.JSONLogFormat
 	if msg := checkTLSInsecure(gatewayAddress, tlsInsecure); len(msg) > 0 && !jsonLogs {
 		fmt.Println(msg)