Remove println and replace it with our logging

cache.go

@@ -17,7 +17,7 @@ func enableCache() {
 	var err error
 	cfg.Cache.CacheClient = cache.New(time.Duration(cfg.Cache.CacheTTL) * time.Second * 2)
 	if err != nil {
-		fmt.Println(">> Error while creating cache client;", "error", err.Error())
+		cfg.Logger.Critical("Can't create cache client", map[string]interface{}{"error": err.Error()})
 		panic(err)
 	}
 }

go.mod

@@ -9,6 +9,7 @@ require (
 	github.com/graphql-go/graphql v0.8.1
 	github.com/json-iterator/go v1.1.12
 	github.com/lukaszraczylo/ask v0.0.0-20230927103145-2ff1123b4415
+	github.com/lukaszraczylo/go-simple-graphql v1.1.31
 	github.com/telegram-bot-app/libpack v0.0.0-20231007021518-909ce2741a36
 )
 
@@ -16,6 +17,7 @@ require (
 	dario.cat/mergo v1.0.0 // indirect
 	github.com/VictoriaMetrics/metrics v1.24.0 // indirect
 	github.com/andybalholm/brotli v1.0.5 // indirect
+	github.com/avast/retry-go/v4 v4.5.0 // indirect
 	github.com/google/uuid v1.3.1 // indirect
 	github.com/gookit/color v1.5.4 // indirect
 	github.com/klauspost/compress v1.17.0 // indirect
@@ -35,6 +37,7 @@ require (
 	github.com/valyala/tcplisten v1.0.0 // indirect
 	github.com/wI2L/jsondiff v0.4.0 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	golang.org/x/net v0.16.0 // indirect
 	golang.org/x/sync v0.4.0 // indirect
 	golang.org/x/sys v0.13.0 // indirect
 	golang.org/x/term v0.13.0 // indirect

go.sum

@@ -6,6 +6,8 @@ github.com/akyoto/cache v1.0.6 h1:5XGVVYoi2i+DZLLPuVIXtsNIJ/qaAM16XT0LaBaXd2k=
 github.com/akyoto/cache v1.0.6/go.mod h1:WfxTRqKhfgAG71Xh6E3WLpjhBtZI37O53G4h5s+3iM4=
 github.com/andybalholm/brotli v1.0.5 h1:8uQZIdzKmjc/iuPu7O2ioW48L81FgatrcpfFmiq/cCs=
 github.com/andybalholm/brotli v1.0.5/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
+github.com/avast/retry-go/v4 v4.5.0 h1:QoRAZZ90cj5oni2Lsgl2GW8mNTnUCnmpx/iKpwVisHg=
+github.com/avast/retry-go/v4 v4.5.0/go.mod h1:7hLEXp0oku2Nir2xBAsg0PTphp9z71bN5Aq1fboC3+I=
 github.com/buger/jsonparser v1.1.1 h1:2PnMjfWD7wBILjqQbt530v576A/cAbQvEW9gGIpYMUs=
 github.com/buger/jsonparser v1.1.1/go.mod h1:6RYKKt7H4d4+iWqouImQ9R2FZql3VbhNgx27UK13J/0=
 github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
@@ -30,6 +32,8 @@ github.com/klauspost/compress v1.17.0 h1:Rnbp4K9EjcDuVuHtd0dgA4qNuv9yKDYKK1ulpJw
 github.com/klauspost/compress v1.17.0/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
 github.com/lukaszraczylo/ask v0.0.0-20230927103145-2ff1123b4415 h1:lvI8Wlbg4PxkRcg2f10wgoaRpfN19v+YdRek3+dLtlM=
 github.com/lukaszraczylo/ask v0.0.0-20230927103145-2ff1123b4415/go.mod h1:M+UVdyqZs++xtEPrascaVmZdOMhCnxjZ2SgH+xHpR0c=
+github.com/lukaszraczylo/go-simple-graphql v1.1.31 h1:UA3f8M1cV+XnO8UZlAqveW0qF/2NN512eB/gRqe+BHs=
+github.com/lukaszraczylo/go-simple-graphql v1.1.31/go.mod h1:MyftQ8jTdtkYImPXJpHoxz6+E53Ydv+7q9+Jr+eT8WU=
 github.com/lukaszraczylo/pandati v0.0.29 h1:WUEWm1+hWjE5KJbIL8OctG00x2dk4XKGJSlrjhxZ55k=
 github.com/lukaszraczylo/pandati v0.0.29/go.mod h1:+DyTWKFaXd+jIfe7GW5w2S5PyTko/RXxMyOa+Vl713A=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
@@ -77,6 +81,8 @@ github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e h1:JVG44RsyaB9T2KIHavM
 github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e/go.mod h1:RbqR21r5mrJuqunuUZ/Dhy/avygyECGrLceyNeo4LiM=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
 golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
+golang.org/x/net v0.16.0 h1:7eBu7KsSvFDtSXUIDbh3aqlK4DPsZ1rByC8PFfBThos=
+golang.org/x/net v0.16.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
 golang.org/x/sync v0.4.0 h1:zxkM55ReGkDlKSM+Fu41A+zmbZuaPVbGMzvvdUPznYQ=
 golang.org/x/sync v0.4.0/go.mod h1:FU7BRWz2tNW+3quACPkgCx/L+uEAv1htQ0V83Z9Rj+Y=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"github.com/gookit/goutil/envutil"
+	graphql "github.com/lukaszraczylo/go-simple-graphql"
 	libpack_config "github.com/telegram-bot-app/libpack/config"
 	libpack_logging "github.com/telegram-bot-app/libpack/logging"
 )
@@ -18,6 +19,8 @@ func parseConfig() {
 	c.Cache.CacheEnable = envutil.GetBool("CACHE_ENABLE", false)
 	c.Cache.CacheTTL = envutil.GetInt("CACHE_TTL", 60)
 	c.Logger = libpack_logging.NewLogger()
+	c.Client.GQLClient = graphql.NewConnection()
+	c.Client.GQLClient.SetEndpoint(c.Server.HostGraphQL)
 	cfg = &c
 	enableCache() // takes close to no resources, but can be used with dynamic query cache
 }

proxy.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"crypto/tls"
-	"fmt"
 
 	fiber "github.com/gofiber/fiber/v2"
 	"github.com/gofiber/fiber/v2/middleware/proxy"
@@ -19,7 +18,7 @@ func proxyTheRequest(c *fiber.Ctx) error {
 
 	err := proxy.DoRedirects(c, cfg.Server.HostGraphQL, 3)
 	if err != nil {
-		fmt.Println("Can't proxy the request: ", err)
+		cfg.Logger.Error("Can't proxy the request", map[string]interface{}{"error": err.Error()})
 		cfg.Monitoring.Increment(libpack_monitoring.MetricsFailed, nil)
 		return err
 	}

server.go

@@ -25,12 +25,19 @@ func StartHTTPProxy() {
 	server.Get("/healthz", healthCheck)
 	err := server.Listen(fmt.Sprintf(":%d", cfg.Server.PortGraphQL))
 	if err != nil {
-		fmt.Println("Can't start the service: ", err)
+		cfg.Logger.Critical("Can't start the service", map[string]interface{}{"error": err.Error()})
 	}
 }
 
 func healthCheck(c *fiber.Ctx) error {
-	return c.SendString("OK")
+	query := `{ __typename }`
+	_, err := cfg.Client.GQLClient.Query(query, nil, nil)
+	if err != nil {
+		cfg.Logger.Error("Can't reach the GraphQL server", map[string]interface{}{"error": err.Error()})
+		cfg.Monitoring.Increment(libpack_monitoring.MetricsFailed, nil)
+		return c.SendStatus(500)
+	}
+	return c.SendStatus(200)
 }
 
 func processGraphQLRequest(c *fiber.Ctx) error {

struct_config.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"github.com/akyoto/cache"
+	graphql "github.com/lukaszraczylo/go-simple-graphql"
 	libpack_logging "github.com/telegram-bot-app/libpack/logging"
 	libpack_monitoring "github.com/telegram-bot-app/libpack/monitoring"
 )
@@ -20,6 +21,7 @@ type config struct {
 
 	Client struct {
 		JWTUserClaimPath string
+		GQLClient        *graphql.BaseClient
 	}
 
 	Cache struct {