Initial commit

new_year_service/new_year_service.go

@@ -0,0 +1,58 @@
+package new_year_service
+
+import (
+	"encoding/json"
+	"io/ioutil"
+	"math/rand"
+	"os"
+)
+
+type newYearConfig struct {
+	Images   []string         `json:"images"`
+	Messages []NewYearMessage `json:"messages"`
+}
+
+type NewYearMessage struct {
+	Header string `json:"header"`
+	Text   string `json:"text"`
+}
+
+type newYearService struct {
+	images   []string
+	messages []NewYearMessage
+}
+
+func NewNewYearService() (NewYearService, error) {
+	images, messages, err := readImagesFromConfig()
+	if err != nil {
+		return nil, err
+	}
+	return &newYearService{images: images, messages: messages}, nil
+}
+
+func (is *newYearService) GetRandomImageURL() string {
+	return is.images[rand.Intn(len(is.images))]
+}
+
+func (is *newYearService) GetRandomMessage() NewYearMessage {
+	return is.messages[rand.Intn(len(is.messages))]
+}
+
+func readImagesFromConfig() ([]string, []NewYearMessage, error) {
+	file, err := os.Open("config/new_year_config.json")
+	if err != nil {
+		return nil, nil, err
+	}
+	defer func(file *os.File) {
+		_ = file.Close()
+	}(file)
+	bytes, err := ioutil.ReadAll(file)
+	if err != nil {
+		return nil, nil, err
+	}
+	newYearConfig := &newYearConfig{}
+	if err := json.Unmarshal(bytes, newYearConfig); err != nil {
+		return nil, nil, err
+	}
+	return newYearConfig.Images, newYearConfig.Messages, nil
+}

new_year_service/new_year_service_interface.go

@@ -0,0 +1,6 @@
+package new_year_service
+
+type NewYearService interface {
+	GetRandomImageURL() string
+	GetRandomMessage() NewYearMessage
+}

new_year_service/new_year_service_log_wrapper.go

@@ -0,0 +1,21 @@
+package new_year_service
+
+import "log"
+
+type newYearServiceLogWrapper struct {
+	service NewYearService
+}
+
+func NewNewYearServiceLogWrapper(service NewYearService) NewYearService {
+	return &newYearServiceLogWrapper{service: service}
+}
+
+func (w *newYearServiceLogWrapper) GetRandomImageURL() string {
+	log.Println("get random image url")
+	return w.service.GetRandomImageURL()
+}
+
+func (w *newYearServiceLogWrapper) GetRandomMessage() NewYearMessage {
+	log.Println("get random message")
+	return w.service.GetRandomMessage()
+}