adds configurable debugging of startup of processes and print out some info from the chrome viable() function for debugging purposes

internal/pkg/pm2/chrome.go

@@ -7,15 +7,19 @@ import (
 	"github.com/mafredri/cdp/devtool"
 )
 
+const (
+	warmupTime = 10 * time.Second
+)
+
 type chrome struct {
 	manager *processManager
 }
 
 // NewChrome retruns a Google Chrome
 // headless process.
-func NewChrome() Process {
+func NewChrome(debug bool) Process {
 	return &chrome{
-		manager: &processManager{},
+		manager: &processManager{verbose: debug},
 	}
 }
 
@@ -58,12 +62,20 @@ func (p *chrome) viable() bool {
 	// check if Google Chrome is correctly running.
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
-	_, err := devtool.New("http://localhost:9222").Version(ctx)
-	return err == nil
+	p.manager.notifyf(`%v: checking Chrome liveness via debug version endpoint 
+'http://localhost:9222/json/version'`, p.name())
+	v, err := devtool.New("http://localhost:9222").Version(ctx)
+	if err != nil {
+		p.manager.notifyf("%v: Chrome version endpoint returned error: %v", p.name(), err)
+		return false
+	}
+	p.manager.notifyf("%v: Chrome returned version info: %+v", p.name(), *v)
+	return true
 }
 
 func (p *chrome) warmup() {
-	time.Sleep(5 * time.Second)
+	p.manager.notifyf("%v: allowing Chrome %v to startup", p.name(), warmupTime)
+	time.Sleep(warmupTime)
 }
 
 // Compile-time checks to ensure type implements desired interfaces.