svc-id.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"testing"
	"time"
)

// ServiceChecker represents a service checker interface
type ServiceChecker interface {
	CheckService(service Service) string
}

// Service represents a critical service to track
type Service struct {
	Name          string        `json:"name"`
	URL           string        `json:"url"`
	IP            string        `json:"ip"`
	Port          string        `json:"port"`
	LocalImage    string        `json:"localImage"`
	CheckInterval time.Duration `json:"checkInterval"`
}

// Config represents the configuration for the program
type Config struct {
	Services []Service `json:"services"`
}

// Monitor continuously monitors the services and reports their availability
func Monitor(services []Service, checker ServiceChecker) {
	for _, service := range services {
		go func(service Service) {
			for {
				status := checker.CheckService(service)
				fmt.Printf("[%s] %s is %s\n", time.Now().Format(time.RFC1123), service.Name, status)
				if status == "down" {
					deployLocalCopy(service)
				}
				time.Sleep(service.CheckInterval * time.Second)
			}
		}(service)
	}
}

// checkService checks the availability of a service and returns its status
func (s *Service) CheckService(service Service) string {
	// Example code to check the availability of the service
	return "up"
}

// deployLocalCopy deploys a local copy of the service using the image from the local repository
func deployLocalCopy(service Service) {
	fmt.Printf("[%s] Deploying local copy of %s using image %s\n", time.Now().Format(time.RFC1123), service.Name, service.LocalImage)
	// Example code to deploy the local copy of the service
}

// MockServiceChecker is a mock implementation of ServiceChecker for testing
type MockServiceChecker struct{}

// CheckService implements the ServiceChecker interface for the mock
func (m *MockServiceChecker) CheckService(service Service) string {
	// Return a fixed status for the mock
	return "up"
}

func TestCheckService(t *testing.T) {
	// Create a test service
	testService := Service{
		Name:          "TestService",
		URL:           "http://example.com",
		IP:            "127.0.0.1",
		Port:          "8080",
		LocalImage:    "local-image",
		CheckInterval: 5,
	}

	// Create a mock checker
	checker := &MockServiceChecker{}

	// Call the CheckService function
	status := checker.CheckService(testService)

	// Check if the status is as expected
	expectedStatus := "up"
	if status != expectedStatus {
		t.Errorf("CheckService(%s) returned %s, expected %s", testService.Name, status, expectedStatus)
	}
}

func TestMonitor(t *testing.T) {
	// Create a test service
	testService := Service{
		Name:          "TestService",
		URL:           "http://example.com",
		IP:            "127.0.0.1",
		Port:          "8080",
		LocalImage:    "local-image",
		CheckInterval: 1,
	}

	// Create a mock checker
	checker := &MockServiceChecker{}

	// Call the Monitor function with the test service and mock checker
	go Monitor([]Service{testService}, checker)

	// Sleep for a short duration to allow Monitor to run
	time.Sleep(3 * time.Second)
}

func TestMain(t *testing.T) {
	// You can write additional test cases for the main function if needed.
	// For testing the main function, consider using TestMain(m *testing.M) and os.Exit to capture the behavior.
}

// The main function should be left empty for testing, as the actual functionality is in the Monitor function.
func main() {}