Adds configuration file config.json

go/config.json

@@ -0,0 +1,4 @@
+{
+    "agent_port": 8080,
+    "nginx_port": 80
+}

go/main.go

@@ -14,19 +14,33 @@ package main
 import (
     "encoding/json"
     "fmt"
+    "io/ioutil"
     "log"
     "net/http"
+    "os"
     "os/exec"
     "strconv"
     "strings"
 )
 
+// Config holds the structure of the configuration file
+type Config struct {
+    AgentPort		int	`json:"agent_port"`
+    NginxPort		int	`json:"nginx_port"`
+}
+
 // NginxData holds the nginx data structure for the API response to /nginx
 type NginxData struct {
-    NginxState		string	`json:"nginx_status"`
+    NginxState		string	`json:"nginx_state"`
     NginxConnections	int	`json:"nginx_connections"`
 }
 
+// JicofoData holds the Jicofo data structure for the API response to /jicofo
+type JicofoData struct {
+    JicofoState		string			`json:"jicofo_state"`
+    JicofoAPIData	map[string]interface{}	`json:"jicofo_api_data"`
+}
+
 // getNginxState checks the status of the nginx service
 func getNginxState() string {
     output, err := exec.Command("systemctl", "is-active", "nginx").Output()
@@ -42,8 +56,9 @@ func getNginxState() string {
 }
 
 // getNginxConnections gets the number of active connections to the specified web port
-func getNginxConnections() int {
-    output, err := exec.Command("bash", "-c", "netstat -an | grep ':80' | wc -l").Output()
+func getNginxConnections(nginxPort int) int {
+    cmd := fmt.Sprintf("netstat -an | grep ':%d' | wc -l", nginxPort)
+    output, err := exec.Command("bash", "-c", cmd).Output()
     if err != nil {
         log.Printf("Error counting the Nginx connections: %v", err)
         return -1
@@ -57,11 +72,48 @@ func getNginxConnections() int {
     return connectionsInt
 }
 
+// getJicofoAPIData gets the response from Jicofo stats API
+func getJicofoAPIData() map[string]interface{} {
+    output, err := exec.Command("bash", "-c", "curl -s http://localhost:8888/stats").Output()
+    if err != nil {
+        log.Printf("Error getting the Jicofo API stats: %v", err)
+        return map[string]interface{}{"error": "failed to get the Jicofo API stats"}
+    }
+    var result map[string]interface{}
+    if err := json.Unmarshal(output, &result); err != nil {
+        log.Printf("Error in parsing the JSON: %v", err)
+        return map[string]interface{}{"error": "invalid JSON format"}
+    }
+    return result
+}
+
+// loadConfig loads the configuration from a JSON config file
+func loadConfig(filename string) (Config, error) {
+    var config Config
+
+    file, err := os.Open(filename)
+    if err != nil {
+        return config, err
+    }
+    defer file.Close()
+
+    bytes, err := ioutil.ReadAll(file)
+    if err != nil {
+        return config, err
+    }
+
+    if err := json.Unmarshal(bytes, &config); err != nil {
+        return config, err
+    }
+
+    return config, nil
+}
+
 // nginxHandler handles the /nginx endpoint
-func nginxHandler(w http.ResponseWriter, r *http.Request) {
+func nginxHandler(config Config, w http.ResponseWriter, r *http.Request) {
     data := NginxData {
         NginxState:		getNginxState(),
-        NginxConnections:	getNginxConnections(),
+        NginxConnections:	getNginxConnections(config.NginxPort),
     }
     w.Header().Set("Content-Type", "application/json")
     json.NewEncoder(w).Encode(data)
@@ -69,9 +121,22 @@ func nginxHandler(w http.ResponseWriter, r *http.Request) {
 
 // main sets up the http server and the routes
 func main() {
-    http.HandleFunc("/nginx", nginxHandler)
-    fmt.Println("Starting agent server on port 8080.")
-    if err := http.ListenAndServe(":8080", nil); err != nil {
+
+    // load the configuration
+    config, err := loadConfig("config.json")
+    if err != nil {
+        log.Fatalf("Error loading the config file: %v\n", err)
+    }
+
+    // endpoints
+    http.HandleFunc("/nginx", func(w http.ResponseWriter, r *http.Request) {
+        nginxHandler(config, w, r)
+    })
+
+    // start the http server
+    agentPortStr := fmt.Sprintf(":%d", config.AgentPort)
+    fmt.Printf("Starting agent server on port %d.\n", config.AgentPort)
+    if err := http.ListenAndServe(agentPortStr, nil); err != nil {
         log.Fatalf("Could not start the server: %v\n", err)
     }
 }