Add get tasks endpoint (#29)

Closes #20

Reviewed-on: #29

backend/main.go

@@ -3,8 +3,8 @@ package main
 import (
 	"context"
 	"embed"
-	"errors"
 	"log"
+	"net"
 	"net/http"
 	"os"
 	"strconv"
@@ -31,7 +31,10 @@ type ServerConfig struct {
 
 	// The port to listen on.
 	// Use an empty string to listen on a random port.
-	Port string
+	Addr string
+
+	// The port that is actually being listened on.
+	Port int
 
 	// The channel that gets signaled when the server has started.
 	Started chan bool
@@ -221,6 +224,16 @@ func createTask(c *gin.Context) {
 	c.IndentedJSON(http.StatusCreated, response)
 }
 
+func getTasks(c *gin.Context) {
+	response, err := db.GetTasks()
+	if err != nil {
+		log.Printf("Error getting tasks: %v", err)
+		c.JSON(http.StatusInternalServerError, gin.H{"error": ErrInternalServerError})
+		return
+	}
+	c.JSON(http.StatusOK, &response)
+}
+
 /*
 *
 Initialises the database, and then starts the server.
@@ -237,21 +250,29 @@ func start(ctx context.Context, config *ServerConfig) {
 	router.POST("/api/user/:userId/goals", createUserGoal)
 	router.DELETE("/api/user/:userId/goal/:goalId", deleteUserGoal)
 	router.POST("/api/tasks", createTask)
+	router.GET("/api/tasks", getTasks)
 
 	srv := &http.Server{
-		Addr:    ":" + config.Port,
+		Addr:    config.Addr,
 		Handler: router.Handler(),
 	}
 	go func() {
-		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
+		l, err := net.Listen("tcp", srv.Addr)
+		if err != nil {
+			log.Fatalf("listen: %s\n", err)
+		}
+		config.Port = l.Addr().(*net.TCPAddr).Port
+
+		log.Printf("Running server on port %s\n", l.Addr().String())
+		if config.Started != nil {
+			config.Started <- true
+		}
+
+		if err := http.Serve(l, router.Handler()); err != nil {
 			log.Fatalf("listen: %s\n", err)
 		}
 	}()
 
-	log.Printf("Running server on port %s\n", config.Port)
-	if config.Started != nil {
-		config.Started <- true
-	}
 	<-ctx.Done()
 	log.Println("Shutting down")
 	if err := srv.Shutdown(context.Background()); err != nil {