feature/add apiv1 error response-style (#14)

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/gofiber/fiber/v2 v2.52.5
 	github.com/jedib0t/go-pretty/v6 v6.5.9
 	github.com/klauspost/compress v1.17.9
+	github.com/mailru/easyjson v0.7.7
 	github.com/rs/zerolog v1.33.0
 	github.com/urfave/cli/v2 v2.27.2
 	github.com/valyala/bytebufferpool v1.0.0
@@ -17,6 +18,7 @@ require (
 	github.com/andybalholm/brotli v1.1.0 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
 	github.com/google/uuid v1.5.0 // indirect
+	github.com/josharian/intern v1.0.0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-runewidth v0.0.15 // indirect

go.sum

@@ -13,8 +13,12 @@ github.com/google/uuid v1.5.0 h1:1p67kYwdtXjb0gL0BPiP1Av9wiZPo5A8z2cWkTZ+eyU=
 github.com/google/uuid v1.5.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/jedib0t/go-pretty/v6 v6.5.9 h1:ACteMBRrrmm1gMsXe9PSTOClQ63IXDUt03H5U+UV8OU=
 github.com/jedib0t/go-pretty/v6 v6.5.9/go.mod h1:zbn98qrYlh95FIhwwsbIip0LYpwSG8SUOScs+v9/t0E=
+github.com/josharian/intern v1.0.0 h1:vlS4z54oSdjm0bgjRigI+G1HpF+tI+9rE5LLzOg8HmY=
+github.com/josharian/intern v1.0.0/go.mod h1:5DoeVV0s6jJacbCEi61lwdGj/aVlrQvzHFFd8Hwg//Y=
 github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
 github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
+github.com/mailru/easyjson v0.7.7 h1:UGYAvKxe3sBsEDzO8ZeWOSlIQfWFlxbzLZe7hwFURr0=
+github.com/mailru/easyjson v0.7.7/go.mod h1:xzfreul335JAWq5oZzymOObrkdz5UnU4kGfJJLY9Nlc=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
 github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=

internal/service/error.go

@@ -0,0 +1,42 @@
+package service
+
+import (
+	"io"
+
+	easyjson "github.com/mailru/easyjson"
+)
+
+type (
+	FiberErrorResponse struct {
+		Status bool
+		Data   interface{}
+		Error  *ResponseError
+	}
+	ResponseError struct {
+		Code        int
+		Message     string
+		Description string
+	}
+)
+
+func newFiberResponseError(status int, msg, desc string) *FiberErrorResponse {
+	return &FiberErrorResponse{
+		Error: &ResponseError{
+			Code:        status,
+			Message:     msg,
+			Description: desc,
+		},
+	}
+}
+
+func respondWithError(status int, msg, desc string, w io.Writer) (e error) {
+	err := newFiberResponseError(status, msg, desc)
+
+	var buf []byte
+	if buf, e = easyjson.Marshal(err); e != nil {
+		return
+	}
+
+	_, e = w.Write(buf)
+	return
+}

internal/service/service.go

@@ -86,15 +86,30 @@ func NewService(c *cli.Context, l *zerolog.Logger, s io.Writer) *Service {
 				return c.Context().Conn().Close()
 			}
 
-			c.Set(fiber.HeaderContentType, fiber.MIMETextPlainCharsetUTF8)
-
-			var e *fiber.Error
-			if !errors.As(err, &e) {
-				return c.Status(fiber.StatusInternalServerError).SendString(err.Error())
+			// AniLibria apiv1 error style:
+			c.Set(fiber.HeaderContentType, fiber.MIMEApplicationJSONCharsetUTF8)
+
+			// `rspcode` - apiv1 legacy hardcode
+			// if u have 4XX or 5XX in service, u must respond with 200
+			rspcode, respdesc, respond :=
+				fiber.StatusOK,
+				"error provided by alice ("+gCli.App.Version+") service",
+				func(status int, msg, desc string) {
+					if e := respondWithError(status, msg, desc, c); e != nil {
+						rlog(c).Error().Msg("could not respond with JSON error - " + e.Error())
+					}
+				}
+
+			// parse fiber error
+			var ferr *fiber.Error
+			if !errors.As(err, &ferr) {
+				respond(fiber.StatusInternalServerError, err.Error(), "")
+				return c.SendStatus(rspcode)
 			}
 
+			respond(ferr.Code, ferr.Error(), respdesc)
 			rlog(c).Error().Msgf("%+v", err)
-			return c.SendStatus(e.Code)
+			return c.SendStatus(rspcode)
 		},
 	})