add metadata endpoint

handlers.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"log"
 	"net/http"
+	"os/exec"
 )
 
 type ApiHandler struct{}
@@ -13,6 +14,12 @@ type ResponseHealthCheck struct {
 	Description string `json:"description"`
 }
 
+type ResponseMetadata struct {
+	Version       string `json:"version"`
+	Description   string `json:"description"`
+	LastCommitSha string `json:"lastcommitsha"`
+}
+
 func (ah *ApiHandler) handleHello(w http.ResponseWriter, r *http.Request) {
 	response := "Hello World"
 
@@ -31,3 +38,25 @@ func (ah *ApiHandler) handleHealthCheck(w http.ResponseWriter, r *http.Request)
 	}
 	w.Write(response)
 }
+
+func (ah *ApiHandler) handleMetadata(w http.ResponseWriter, r *http.Request) {
+	responseMetaData := ResponseMetadata{
+		Version:       "1.0.777",
+		Description:   "basic go-lang api service",
+		LastCommitSha: string(getSha()),
+	}
+
+	response, err := json.Marshal(&responseMetaData)
+	if err != nil {
+		log.Fatal(err)
+	}
+	w.Write(response)
+}
+
+func getSha() []byte {
+	sha, err := exec.Command("bash", "-c", "git rev-parse HEAD").Output()
+	if err != nil {
+		log.Fatal(err)
+	}
+	return sha
+}

main.go

@@ -7,14 +7,15 @@ import (
 
 const (
 	host = "localhost"
-	port = "8001"
+	port = "8002"
 )
 
 func main() {
 	apiHandler := ApiHandler{}
 
 	http.HandleFunc("/hello", apiHandler.handleHello)
 	http.HandleFunc("/health", apiHandler.handleHealthCheck)
+	http.HandleFunc("/metadata", apiHandler.handleMetadata)
 
 	err := http.ListenAndServe(host+":"+port, nil)
 	if err != nil {