Add list retrieval to api

todo.go

+package main
+
+import (
+	_ "github.com/lib/pq"
+    "database/sql"
+    "encoding/json"
+    "fmt"
+    "io/ioutil"
+    "log"
+    "net/http"
+    "strconv"
+    "strings"
+)
+
+type Task struct {
+    Id int
+    Name string
+    Done bool
+    ListId int
+}
+
+type CreateTaskRequest struct {
+    Name string `json:"name"`
+    ListId int  `json:"list_id"`
+}
+
+type List struct {
+    Id int
+    Name string
+}
+
+type ListCreateRequest struct {
+    Name string
+}
+
+type ListCreateResponse struct {
+    Id int
+}
+
+func CheckFatal(err error) {
+    if err != nil {
+        log.Fatal(err)
+    }
+}
+
+type Database struct {
+    Db *sql.DB
+}
+
+func getLists(db *sql.DB) []List {
+    rows, err := db.Query("select * from list")
+    CheckFatal(err)
+
+    // Retrieve all lists from the query
+    res := make([]List, 0)
+    for rows.Next() {
+        list := List{}
+        err := rows.Scan(&list.Id, &list.Name)
+        CheckFatal(err)
+        res = append(res, list)
+    }
+
+    return res
+}
+
+func (db *Database) listHandler(w http.ResponseWriter, r *http.Request) {
+    // Retrieve lists
+    list := getLists(db.Db)
+    json.NewEncoder(w).Encode(&list)
+}
+
+func ConnectDb() *sql.DB {
+    db, err := sql.Open("postgres", "postgres://simon@localhost/todo?sslmode=disable")
+    CheckFatal(err)
+
+    return db
+}
+
+func Handlers() *http.ServeMux {
+    db := Database{Db: ConnectDb()}
+    mux := http.NewServeMux()
+    mux.Handle("/list", http.HandlerFunc(db.listHandler))
+    return mux
+}
+
+func main() {
+    // Listen on port 5050
+    err := http.ListenAndServe(":5050", Handlers())
+    CheckFatal(err)
+}