chore: set log level in Publish command

dsl/publish.go

@@ -4,6 +4,7 @@ import (
 	"log"
 
 	"github.com/pact-foundation/pact-go/types"
+	"github.com/hashicorp/logutils"
 )
 
 // PactFile is a simple representation of a Pact file to be able to
@@ -24,10 +25,17 @@ type PactName struct {
 // Publisher is the API to send Pact files to a Pact Broker.
 type Publisher struct {
 	pactClient Client
+
+	// Log levels.
+	LogLevel string
+
+	// Used to detect if logging has been configured.
+	logFilter *logutils.LevelFilter	
 }
 
 // Publish sends the Pacts to a broker, optionally tagging them
 func (p *Publisher) Publish(request types.PublishRequest) error {
+	p.setupLogging()
 	log.Println("[DEBUG] pact publisher: publish pact")
 
 	if p.pactClient == nil {
@@ -43,3 +51,19 @@ func (p *Publisher) Publish(request types.PublishRequest) error {
 
 	return p.pactClient.PublishPacts(request)
 }
+
+// Configure logging
+func (p *Publisher) setupLogging() {
+	if p.logFilter == nil {
+		if p.LogLevel == "" {
+			p.LogLevel = "INFO"
+		}
+		p.logFilter = &logutils.LevelFilter{
+			Levels:   []logutils.LogLevel{"TRACE", "DEBUG", "INFO", "WARN", "ERROR"},
+			MinLevel: logutils.LogLevel(p.LogLevel),
+			Writer:   os.Stderr,
+		}
+		log.SetOutput(p.logFilter)
+	}
+	log.Println("[DEBUG] pact setup logging")
+}