massive: move a lot of things

x-tba/swapi-api-client/starship.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+// Starship represents a Star Wars space ship
+type Starship struct {
+	// All fields should be exported to be decoded
+	Name    string      `json:"name"`
+	Credits json.Number `json:"cost_in_credits"`
+	Rating  float64     `json:"hyperdrive_rating,string"`
+}
+
+func (ship Starship) String() string {
+	var buf strings.Builder
+
+	fmt.Fprintf(&buf, "Ship Name: %s\n", ship.Name)
+	fmt.Fprintf(&buf, "Price    : %s\n", ship.Credits)
+
+	return buf.String()
+}
+
+// TODO: return error instead of quit()
+func fetchStarships(ctx context.Context, shipUrls []string, ships []Starship) error {
+	ships = ships[:0]
+
+	re := regexp.MustCompile(`/([0-9]+)/$`)
+	for _, url := range shipUrls {
+		ids := re.FindAllStringSubmatch(url, -1)
+		if ids == nil {
+			continue
+		}
+
+		sid := ids[0][1]
+		id, _ := strconv.Atoi(sid)
+
+		// TODO: goroutine
+		ship, err := fetchStarship(ctx, id)
+		if err != nil {
+			return err
+		}
+
+		ships = append(ships, ship)
+	}
+	return nil
+}
+
+// fetchStarship returns Starship info by its id
+func fetchStarship(ctx context.Context, id int) (ship Starship, err error) {
+	c, err := request(ctx, fmt.Sprintf(swapi+"starships/%d/", id))
+	if err != nil {
+		return ship, err
+	}
+
+	// -> If your response body is small enough,
+	//    just read it all into memory using ioutil.ReadAll
+	//    and use json.Unmarshal.
+	//
+	// -> Do not use json.Decoder if you are not dealing
+	//    with JSON streaming.
+
+	return ship, json.Unmarshal(c, &ship)
+}