Hands-On Microservices with Kubernetes

Running a local service

One of the most important helper functions is RunService(). Microservices often depend on other microservices. When testing a service, the test code often needs to run the dependent services. Here, the code builds a Go service in its target directory and executes it:

// Build and run a service in a target directoryfunc RunService(ctx context.Context, targetDir string, service string) {   // Save and restore later current working dir   wd, err := os.Getwd()   Check(err)   defer os.Chdir(wd)   // Build the server if needed   os.Chdir(targetDir)   _, err = os.Stat("./" + service)   if os.IsNotExist(err) {      _, err := exec.Command("go", "build", ".").CombinedOutput()      Check(err)   }   cmd := exec.CommandContext(ctx, "./"+service) err = cmd.Start() ...