server: Add HTTP server

config.go

@@ -7,6 +7,7 @@ import (
 
 type Config struct {
 	Targets []checkTarget
+	Port    int
 }
 
 func ReadConfig(file string) (Config, error) {

main.go

@@ -1,9 +1,14 @@
 package main
 
+import (
+	"status/server"
+)
+
 func main() {
 	cfg, err := ReadConfig("config.json")
 	if err != nil {
 		panic(err)
 	}
-	checkLoop(cfg.Targets)
+	go checkLoop(cfg.Targets)
+	server.StartServer(cfg.Port)
 }

server/api.go

@@ -0,0 +1,20 @@
+package server
+
+import (
+	"encoding/json"
+	"net/http"
+)
+
+func writeJSON(w http.ResponseWriter, a interface{}) {
+	bytes, err := json.Marshal(a)
+	if err != nil {
+		http.Error(w, "500 Internal Server Error", http.StatusInternalServerError)
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(bytes)
+}
+
+func allStatus(w http.ResponseWriter, req *http.Request) {
+	status := getStatus()
+	writeJSON(w, status)
+}

server/cache.go

@@ -0,0 +1,19 @@
+package server
+
+import (
+	"time"
+
+	"status/db"
+)
+
+func getStatus() map[string]db.PingEntry {
+	entries := db.GetFromDB("", time.Now().Add(time.Duration(-2)*time.Minute), time.Now())
+	result := make(map[string]db.PingEntry)
+	for _, v := range entries {
+		if v.Time.Before(result[v.ServiceName].Time) {
+			continue
+		}
+		result[v.ServiceName] = v
+	}
+	return result
+}

server/server.go

@@ -0,0 +1,19 @@
+package server
+
+import (
+	"fmt"
+	"net/http"
+	"strconv"
+)
+
+func apiEndpoints() {
+	http.HandleFunc("/api/latest", allStatus)
+}
+
+func StartServer(port int) {
+	apiEndpoints()
+	err := http.ListenAndServe(":"+strconv.Itoa(port), nil)
+	if err != nil {
+		fmt.Printf("ListenAndServe returned an error: %v", err)
+	}
+}