feat: design a separate package for health check

internal/health/composite.go

@@ -0,0 +1,54 @@
+package health
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+type CompositeChecker struct {
+	checkers []Checker
+}
+
+func NewCompositeChecker(checkers ...Checker) *CompositeChecker {
+	return &CompositeChecker{
+		checkers: checkers,
+	}
+}
+
+func (c *CompositeChecker) AddChecker(checker Checker) {
+	c.checkers = append(c.checkers, checker)
+}
+
+func (c *CompositeChecker) Check(ctx context.Context) OverallResult {
+	results := make(map[string]Result)
+	var mu sync.Mutex
+	var wg sync.WaitGroup
+
+	for _, checker := range c.checkers {
+		wg.Add(1)
+		go func(ch Checker) {
+			defer wg.Done()
+
+			result := ch.Check(ctx)
+
+			mu.Lock()
+			results[ch.Name()] = result
+			mu.Unlock()
+		}(checker)
+	}
+
+	wg.Wait()
+
+	return OverallResult{
+		Status:    determineOverallStatus(results),
+		Timestamp: time.Now().UTC(),
+		Services:  results,
+	}
+}
+
+func (c *CompositeChecker) CheckWithVersion(ctx context.Context, version string) OverallResult {
+	result := c.Check(ctx)
+	result.Version = version
+	return result
+}