services/serve: wait for a fix on build error

go.mod

@@ -12,6 +12,7 @@ require (
 	github.com/gobuffalo/plush v3.8.3+incompatible
 	github.com/gobuffalo/plushgen v0.1.2
 	github.com/goccy/go-yaml v1.8.0
+	github.com/gookit/color v1.2.7
 	github.com/gorilla/mux v1.7.4
 	github.com/ilgooz/analytics-go v3.1.1-0.20200723195510-acde4190c655+incompatible
 	github.com/karrick/godirwalk v1.15.6 // indirect

go.sum

@@ -110,6 +110,8 @@ github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
 github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/gookit/color v1.2.7 h1:4qePMNWZhrmbfYJDix+J4V2l0iVW+6jQGjicELlN14E=
+github.com/gookit/color v1.2.7/go.mod h1:AhIE+pS6D4Ql0SQWbBeXPHw7gY0/sjHoA4s/n1KB7xg=
 github.com/gorilla/mux v1.7.4 h1:VuZ8uybHlWmqV03+zRzdwKL4tUnIp1MAQtp1mIFE1bc=
 github.com/gorilla/mux v1.7.4/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=

starport/services/serve/serve.go

@@ -15,6 +15,7 @@ import (
 	"time"
 
 	"github.com/go-git/go-git/v5"
+	"github.com/gookit/color"
 	"github.com/pkg/errors"
 	"github.com/tendermint/starport/starport/pkg/cmdrunner"
 	"github.com/tendermint/starport/starport/pkg/cmdrunner/step"
@@ -31,6 +32,9 @@ var (
 		"cmd",
 		"x",
 	}
+
+	errorColor = color.Red.Render
+	infoColor  = color.Yellow.Render
 )
 
 type App struct {
@@ -83,9 +87,16 @@ func Serve(ctx context.Context, app App, conf starportconf.Config, verbose bool)
 			case <-s.serveRefresher:
 				var serveCtx context.Context
 				serveCtx, s.serveCancel = context.WithCancel(ctx)
-				if err := s.serve(serveCtx); err != nil && err != context.Canceled {
-					return err
+				err := s.serve(serveCtx)
+				if err == nil || err == context.Canceled {
+					continue
+				}
+				if _, ok := err.(*CannotBuildAppError); ok {
+					fmt.Fprintf(os.Stderr, "%s\n", errorColor(err.Error()))
+					fmt.Printf("%s\n", infoColor("waiting for a fix before retrying..."))
+					continue
 				}
+				return err
 			}
 		}
 	})
@@ -158,7 +169,15 @@ func (s *starportServe) buildSteps() (steps step.Steps) {
 
 		appd   = s.app.Name + "d"
 		appcli = s.app.Name + "cli"
+
+		buildErr = &bytes.Buffer{}
 	)
+	captureBuildErr := func(exitErr error) error {
+		if exitErr != nil {
+			return &CannotBuildAppError{Log: buildErr.String()}
+		}
+		return nil
+	}
 	steps.Add(step.New(
 		step.Exec("go", "mod", "tidy"),
 		step.PreExec(func() error {
@@ -168,14 +187,31 @@ func (s *starportServe) buildSteps() (steps step.Steps) {
 			fmt.Println("\n📦 Installing dependencies...")
 			return nil
 		}),
-		step.PostExec(func(exitErr error) error {
-			return errors.Wrap(exitErr, "cannot install go modules")
-		}),
+		step.PostExec(captureBuildErr),
+		step.Stderr(buildErr),
 	))
-	steps.Add(step.New(step.Exec("go", "mod", "verify")))
+	steps.Add(step.New(
+		step.Exec("go", "mod", "verify"),
+		step.PostExec(captureBuildErr),
+		step.Stderr(buildErr),
+	))
+
 	cwd, _ := os.Getwd()
-	steps.Add(step.New(step.Exec("go", "install", "-mod", "readonly", "-ldflags", ldflags, filepath.Join(cwd, "cmd", appd))))
-	steps.Add(step.New(step.Exec("go", "install", "-mod", "readonly", "-ldflags", ldflags, filepath.Join(cwd, "cmd", appcli))))
+
+	steps.Add(step.New(
+		step.Exec("go", "install", "-mod", "readonly", "-ldflags", ldflags, filepath.Join(cwd, "cmd", appd)),
+		step.PreExec(func() error {
+			fmt.Println("🛠️  Building the app...")
+			return nil
+		}),
+		step.PostExec(captureBuildErr),
+		step.Stderr(buildErr),
+	))
+	steps.Add(step.New(
+		step.Exec("go", "install", "-mod", "readonly", "-ldflags", ldflags, filepath.Join(cwd, "cmd", appcli)),
+		step.PostExec(captureBuildErr),
+		step.Stderr(buildErr),
+	))
 	steps.Add(step.New(
 		step.Exec(appd, "init", "mynode", "--chain-id", ndapp),
 		step.PreExec(func() error {
@@ -323,3 +359,11 @@ func (s *starportServe) appVersion() (v version, err error) {
 	v.hash = ref.Hash().String()
 	return v, nil
 }
+
+type CannotBuildAppError struct {
+	Log string
+}
+
+func (e *CannotBuildAppError) Error() string {
+	return fmt.Sprintf("cannot build app:\n\n\t%s", e.Log)
+}