Output data as JSON

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"net/http"
 
 	_ "github.com/mattn/go-sqlite3"
@@ -28,7 +29,16 @@ func main() {
 	ping.SendPing(db, failureSite)
 
 	http.HandleFunc("GET /", func(w http.ResponseWriter, r *http.Request) {
-		w.Write([]byte("This was a GET request!"))
+		pings := ping.List(db)
+
+		if output, err := json.Marshal(pings); err != nil {
+			w.Write([]byte(err.Error()))
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		} else {
+			w.Header().Set("Content-Type", "application/json")
+			w.Write(output)
+		}
 	})
 
 	http.HandleFunc("POST /", func(w http.ResponseWriter, r *http.Request) {

ping/ping.go

@@ -20,6 +20,12 @@ type Ping struct {
 	Status    Status
 }
 
+type PingResponse struct {
+	Site      sites.Site
+	Timestamp string
+	Status    string
+}
+
 const createQuery = `CREATE TABLE IF NOT EXISTS statuses (
 	id INTEGER PRIMARY KEY,
 	name TEXT NOT NULL
@@ -73,3 +79,25 @@ func SendPing(db *sql.DB, site sites.Site) {
 
 	p.Save(db)
 }
+
+func List(db *sql.DB) []PingResponse {
+	rows, err := db.Query(`SELECT sites.url as url, sites.name, ping.timestamp as timestamp, statuses.name as status FROM ping
+		JOIN sites ON ping.site = sites.url
+		JOIN statuses ON ping.status = statuses.id
+	ORDER BY timestamp DESC`)
+
+	if err != nil {
+		panic(err)
+	}
+	defer rows.Close()
+
+	pings := make([]PingResponse, 0)
+
+	for rows.Next() {
+		p := PingResponse{}
+		rows.Scan(&p.Site.Url, &p.Site.Name, &p.Timestamp, &p.Status)
+		pings = append(pings, p)
+	}
+
+	return pings
+}