Refactored code and added logging

.gitignore

@@ -2,3 +2,4 @@ vendor
 go-mtg-vk
 *.swp
 hosts
+.idea

caching/client.go

@@ -23,11 +23,11 @@ func GetClient() *CacheClient {
 
 func (client *CacheClient) Init() {
 	client.storage = redis.NewClient(&redis.Options{
-		Addr:     HOST_NAME,
-		Password: PASSWORD,
+		Addr:     HostName,
+		Password: Password,
 		DB:       0,
 	})
-	client.Expiration = CACHE_EXPIRATION
+	client.Expiration = CacheExpiration
 }
 
 func (client *CacheClient) Set(key string, value string) {

caching/secrets.go

@@ -4,6 +4,6 @@ import (
 	"time"
 )
 
-const HOST_NAME = "redis:6379"
-const PASSWORD = ""
-const CACHE_EXPIRATION = time.Hour * 24
+const HostName = "redis:6379"
+const Password = ""
+const CacheExpiration = time.Hour * 24

cardsinfo/names.go

@@ -8,26 +8,26 @@ import (
 	"strings"
 )
 
-const SCRYFALL_URL = "https://api.scryfall.com"
+const ScryfallUrl = "https://api.scryfall.com"
 
 func GetNameByCardId(set string, number string) string {
 	/*
-	Note: number is string because some cards contain letters in their numbers.
+		Note: number is string because some cards contain letters in their numbers.
 	*/
-	path := SCRYFALL_URL + "/cards/" + strings.ToLower(set) + "/" + number
+	path := ScryfallUrl + "/cards/" + strings.ToLower(set) + "/" + number
 	return GetCardByUrl(path)
 }
 
 func GetOriginalName(name string) string {
-	path := SCRYFALL_URL + "/cards/named?fuzzy=" + ApplyFilters(name)
+	path := ScryfallUrl + "/cards/named?fuzzy=" + ApplyFilters(name)
 	return GetCardByUrl(path)
 }
 
 func ApplyFilters(name string) string {
 	/*
-	Despite of the rules of Russian language, letter ё is replaced with e on cards
-	Sometimes it leads to wrong search results
-	*/	
+		Despite of the rules of Russian language, letter ё is replaced with e on cards
+		Sometimes it leads to wrong search results
+	*/
 	name = strings.ReplaceAll(name, "ё", "е")
 	return url.QueryEscape(name)
 }
@@ -43,6 +43,9 @@ func GetCardByUrl(path string) string {
 		return ""
 	}
 	var v Card
-	json.Unmarshal(data, &v)
+	err = json.Unmarshal(data, &v)
+	if err != nil {
+		return ""
+	}
 	return v.getName()
 }

cardsinfo/scgprices.go

@@ -8,7 +8,7 @@ import (
 	"strings"
 )
 
-const SCGURL = "http://www.starcitygames.com/results?name="
+const Scgurl = "http://www.starcitygames.com/results?name="
 
 func GetSCGPrices(name string) ([]CardPrice, error) {
 	preprocessedName := preprocessNameForSearch(name)
@@ -69,7 +69,7 @@ func getPriceContainers(doc *html.Node) []*html.Node {
 func fetchPrice(price string) (float64, error) {
 	split := strings.Split(price, "$")
 	if len(split) < 2 {
-		return 0, errors.New("Not enough values")
+		return 0, errors.New("not enough values")
 	}
 	p := split[1]
 	v, err := strconv.ParseFloat(p, 64)
@@ -77,9 +77,9 @@ func fetchPrice(price string) (float64, error) {
 }
 
 func getSCGUrl(name string) string {
-	splitted := strings.Split(name, " ")
-	scgName := strings.Join(splitted, "+")
-	url := SCGURL + scgName
+	words := strings.Split(name, " ")
+	scgName := strings.Join(words, "+")
+	url := Scgurl + scgName
 	return url
 }
 

deploy.sh

@@ -10,10 +10,10 @@ then
 	sudo docker rmi -f $TEST_IMAGE_NAME
 	sudo docker build -t $TEST_IMAGE_NAME .
 	TEST_CONTAINER_NAME="go_mtg_vk_test_container"
-	sudo docker run --rm --name $TEST_CONTAINER_NAME --network $TEST_NETWORK_NAME -e MODE="test" -e VK_TOKEN=$VK_TOKEN -e VK_SECRET_KEY=$VK_SECRET_KEY -e VK_GROUP_ID=$VK_GROUP_ID -e VK_CONFIRMATION_STRING=$VK_CONFIRMATION_STRING $TEST_IMAGE_NAME
+	sudo docker run --rm --name $TEST_CONTAINER_NAME --network $TEST_NETWORK_NAME -e MODE="test" -e VK_TOKEN="$VK_TOKEN" -e VK_SECRET_KEY="$VK_SECRET_KEY" -e VK_GROUP_ID="$VK_GROUP_ID" -e VK_CONFIRMATION_STRING="$VK_CONFIRMATION_STRING" $TEST_IMAGE_NAME
 	EXIT_CODE=$(sudo docker inspect $TEST_CONTAINER_NAME --format "{{.State.ExitCode}}")
 	sudo docker rm -f $TEST_REDIS_NAME
-	exit $EXIT_CODE
+	exit "$EXIT_CODE"
 elif [[ $1 = "prod" ]]
 then
 	PROD_NETWORK_NAME="go_mtg_vk_prod_network"
@@ -26,5 +26,5 @@ then
 	PROD_CONTAINER_NAME="go_mtg_vk_prod_container"
 	sudo docker stop $PROD_CONTAINER_NAME
 	sudo docker rm $PROD_CONTAINER_NAME
-	sudo docker run -v /var/log/go_mtg_vk:/go/src/go-mtg-vk/logs -d -p 80:80 --network $PROD_NETWORK_NAME --restart always --name $PROD_CONTAINER_NAME -e MODE="prod" -e VK_TOKEN=$VK_TOKEN -e VK_SECRET_KEY=$VK_SECRET_KEY -e VK_GROUP_ID=$VK_GROUP_ID -e VK_CONFIRMATION_STRING=$VK_CONFIRMATION_STRING $PROD_IMAGE_NAME
+	sudo docker run -v /var/log/go_mtg_vk:/go/src/go-mtg-vk/logs -d -p 80:80 --network $PROD_NETWORK_NAME --restart always --name $PROD_CONTAINER_NAME -e MODE="prod" -e VK_TOKEN="$VK_TOKEN" -e VK_SECRET_KEY="$VK_SECRET_KEY" -e VK_GROUP_ID="$VK_GROUP_ID" -e VK_CONFIRMATION_STRING="$VK_CONFIRMATION_STRING" $PROD_IMAGE_NAME
 fi

jenkins/run.sh

@@ -9,10 +9,10 @@ sudo docker run -d \
 	-v /var/run/docker.sock:/var/run/docker.sock\
 	-v jenkins_home_mtg_go:/var/jenkins_home\
 	--name $CONTAINER_NAME\
-	-e VK_TOKEN=$VK_TOKEN\
-	-e VK_SECRET_KEY=$VK_SECRET_KEY\
-	-e VK_GROUP_ID=$VK_GROUP_ID\
-	-e VK_CONFIRMATION_STRING=$VK_CONFIRMATION_STRING\
+	-e VK_TOKEN="$VK_TOKEN"\
+	-e VK_SECRET_KEY="$VK_SECRET_KEY"\
+	-e VK_GROUP_ID="$VK_GROUP_ID"\
+	-e VK_CONFIRMATION_STRING="$VK_CONFIRMATION_STRING"\
 	--name $CONTAINER_NAME\
    	$IMAGE_NAME
 sudo docker exec -it $CONTAINER_NAME sudo service docker start 

main.go

@@ -13,10 +13,9 @@ import (
 func main() {
 	rand.Seed(time.Now().UTC().UnixNano())
 	logFile, _ := os.OpenFile("logs/errors.log", os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
-	defer logFile.Close()
 
 	log.SetOutput(logFile)
 	r := gin.Default()
 	r.POST("callback/message", vk.HandleMessage)
-	r.Run(":80")
+	_ = r.Run(":80")
 }

vk/handlers.go

@@ -12,7 +12,7 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
-const CARDSLIMIT = 8
+const Cardslimit = 8
 
 func min(a, b int) int {
 	if a < b {
@@ -23,20 +23,20 @@ func min(a, b int) int {
 
 func HandleMessage(c *gin.Context) {
 	var req MessageRequest
-	c.BindJSON(&req)
-	if req.Secret != SECRET_KEY {
+	_ = c.BindJSON(&req)
+	if req.Secret != SecretKey {
 		return
 	}
 	switch req.Type {
 	case "confirmation":
 		handleConfirmation(c, &req)
 	case "message_new":
-		go handleSearch(c, &req)
+		go handleSearch(&req)
 		c.String(http.StatusOK, "ok")
 	}
 }
 
-func handleSearch(c *gin.Context, req *MessageRequest) {
+func handleSearch(req *MessageRequest) {
 	cardName, err := getCardNameByCommand(req.Object.Body)
 	if err != nil {
 		Message(req.Object.UserId, "Некорректная команда")
@@ -51,7 +51,7 @@ func handleSearch(c *gin.Context, req *MessageRequest) {
 			log.Printf("Could not find SCG prices\n error message: %s\n card name: %s", err.Error(), cardName)
 			return
 		}
-		elements := min(CARDSLIMIT, len(prices))
+		elements := min(Cardslimit, len(prices))
 		prices = prices[:elements]
 		priceInfo := cardsinfo.FormatCardPrices(cardName, prices)
 		Message(req.Object.UserId, priceInfo)
@@ -74,7 +74,7 @@ func GetPrices(cardName string) ([]cardsinfo.CardPrice, error) {
 		client.Set(cardName, string(serialized))
 		return prices, nil
 	}
-	json.Unmarshal([]byte(val), &prices)
+	_ = json.Unmarshal([]byte(val), &prices)
 	return prices, nil
 }
 
@@ -96,7 +96,7 @@ func getCardNameByCommand(command string) (string, error) {
 }
 
 func handleConfirmation(c *gin.Context, req *MessageRequest) {
-	if (req.Type == "confirmation") && (req.GroupId == GROUPID) {
-		c.String(http.StatusOK, CONFIRMATION_STRING)
+	if (req.Type == "confirmation") && (req.GroupId == GroupId) {
+		c.String(http.StatusOK, ConfirmationString)
 	}
 }

vk/message.go

@@ -1,6 +1,7 @@
 package vk
 
 import (
+	"log"
 	"math/rand"
 	"net/http"
 	"net/url"
@@ -8,17 +9,20 @@ import (
 	"strings"
 )
 
-const VKURL = "https://api.vk.com/method/messages.send"
+const SendMessageUrl = "https://api.vk.com/method/messages.send"
 
 func Message(userId int64, message string) {
 	randomId := rand.Int31()
 	params := []string{
-		"access_token=" + TOKEN,
+		"access_token=" + Token,
 		"peer_id=" + strconv.FormatInt(userId, 10),
 		"message=" + url.QueryEscape(message),
 		"v=5.95",
 		"random_id=" + strconv.FormatInt(int64(randomId), 10),
 	}
 	paramString := strings.Join(params, "&")
-	http.Get(VKURL + "?" + paramString)
+	resp, err := http.Get(SendMessageUrl + "?" + paramString)
+	if err != nil || resp.StatusCode != http.StatusOK {
+		log.Print("Could not send message\n user: %lld", userId)
+	}
 }

vk/secrets.go

@@ -5,7 +5,7 @@ import (
 	"strconv"
 )
 
-var TOKEN = os.Getenv("VK_TOKEN")
-var SECRET_KEY = os.Getenv("VK_SECRET_KEY")
-var GROUPID, _ = strconv.ParseInt(os.Getenv("VK_GROUP_ID"), 10, 64)
-var CONFIRMATION_STRING = os.Getenv("VK_CONFIRMATION_STRING")
+var Token = os.Getenv("VK_TOKEN")
+var SecretKey = os.Getenv("VK_SECRET_KEY")
+var GroupId, _ = strconv.ParseInt(os.Getenv("VK_GROUP_ID"), 10, 64)
+var ConfirmationString = os.Getenv("VK_CONFIRMATION_STRING")