Add rough sentry reporting to catch panic in the mojang textures decoder

Gopkg.lock

@@ -265,7 +265,7 @@
   version = "v0.1.1"
 
 [[projects]]
-  digest = "1:381bcbeb112a51493d9d998bbba207a529c73dbb49b3fd789e48c63fac1f192c"
+  digest = "1:cc4eb6813da8d08694e557fcafae8fcc24f47f61a0717f952da130ca9a486dfc"
   name = "github.com/stretchr/testify"
   packages = [
     "assert",
@@ -274,8 +274,8 @@
     "suite",
   ]
   pruneopts = ""
-  revision = "ffdc059bfe9ce6a4e144ba849dbedead332c6053"
-  version = "v1.3.0"
+  revision = "3ebf1ddaeb260c4b1ae502a01c7844fa8c1fa0e9"
+  version = "v1.5.1"
 
 [[projects]]
   branch = "master"

api/mojang/mojang.go

@@ -3,6 +3,7 @@ package mojang
 import (
 	"bytes"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
@@ -24,7 +25,7 @@ type SignedTexturesResponse struct {
 	decodedTextures *TexturesProp
 }
 
-func (t *SignedTexturesResponse) DecodeTextures() *TexturesProp {
+func (t *SignedTexturesResponse) DecodeTextures() (*TexturesProp, error) {
 	if t.decodedTextures == nil {
 		var texturesProp string
 		for _, prop := range t.Props {
@@ -35,14 +36,18 @@ func (t *SignedTexturesResponse) DecodeTextures() *TexturesProp {
 		}
 
 		if texturesProp == "" {
-			return nil
+			return nil, errors.New("unable to find the textures property")
+		}
+
+		decodedTextures, err := DecodeTextures(texturesProp)
+		if err != nil {
+			return nil, err
 		}
 
-		decodedTextures, _ := DecodeTextures(texturesProp)
 		t.decodedTextures = decodedTextures
 	}
 
-	return t.decodedTextures
+	return t.decodedTextures, nil
 }
 
 type Property struct {

api/mojang/mojang_test.go

@@ -20,7 +20,8 @@ func TestSignedTexturesResponse(t *testing.T) {
 				},
 			},
 		}
-		textures := obj.DecodeTextures()
+		textures, err := obj.DecodeTextures()
+		testify.Nil(t, err)
 		testify.Equal(t, "3e3ee6c35afa48abb61e8cd8c42fc0d9", textures.ProfileID)
 	})
 
@@ -30,7 +31,8 @@ func TestSignedTexturesResponse(t *testing.T) {
 			Name:  "mock",
 			Props: []*Property{},
 		}
-		textures := obj.DecodeTextures()
+		textures, err := obj.DecodeTextures()
+		testify.Errorf(t, err, "unable to find the textures property")
 		testify.Nil(t, textures)
 	})
 }

http/skinsystem.go

@@ -66,7 +66,7 @@ func (ctx *Skinsystem) skinHandler(response http.ResponseWriter, request *http.R
 		return
 	}
 
-	texturesProp := mojangTextures.DecodeTextures()
+	texturesProp, _ := mojangTextures.DecodeTextures()
 	skin := texturesProp.Textures.Skin
 	if skin == nil {
 		response.WriteHeader(http.StatusNotFound)
@@ -104,7 +104,7 @@ func (ctx *Skinsystem) capeHandler(response http.ResponseWriter, request *http.R
 		return
 	}
 
-	texturesProp := mojangTextures.DecodeTextures()
+	texturesProp, _ := mojangTextures.DecodeTextures()
 	cape := texturesProp.Textures.Cape
 	if cape == nil {
 		response.WriteHeader(http.StatusNotFound)
@@ -162,7 +162,7 @@ func (ctx *Skinsystem) texturesHandler(response http.ResponseWriter, request *ht
 			return
 		}
 
-		texturesProp := mojangTextures.DecodeTextures()
+		texturesProp, _ := mojangTextures.DecodeTextures()
 		if texturesProp == nil {
 			ctx.Emit("skinsystem:error", errors.New("unable to find textures property"))
 			apiServerError(response)

mojangtextures/in_memory_textures_storage.go

@@ -1,9 +1,12 @@
 package mojangtextures
 
 import (
+	"fmt"
 	"sync"
 	"time"
 
+	"github.com/getsentry/raven-go"
+
 	"github.com/elyby/chrly/api/mojang"
 
 	"github.com/tevino/abool"
@@ -75,9 +78,22 @@ func (s *InMemoryTexturesStorage) GetTextures(uuid string) (*mojang.SignedTextur
 func (s *InMemoryTexturesStorage) StoreTextures(uuid string, textures *mojang.SignedTexturesResponse) {
 	var timestamp int64
 	if textures != nil {
-		decoded := textures.DecodeTextures()
-		if decoded == nil {
-			panic("unable to decode textures")
+		decoded, err := textures.DecodeTextures()
+		if err != nil {
+			tags := map[string]string{
+				"textures.id":   textures.Id,
+				"textures.name": textures.Name,
+			}
+
+			for i, prop := range textures.Props {
+				tags[fmt.Sprintf("textures.props[%d].name", i)] = prop.Name
+				tags[fmt.Sprintf("textures.props[%d].value", i)] = prop.Value
+				tags[fmt.Sprintf("textures.props[%d].signature", i)] = prop.Signature
+			}
+
+			raven.CaptureErrorAndWait(err, tags)
+
+			panic(err)
 		}
 
 		timestamp = decoded.Timestamp

mojangtextures/in_memory_textures_storage_test.go

@@ -116,7 +116,7 @@ func TestInMemoryTexturesStorage_StoreTextures(t *testing.T) {
 			Props: []*mojang.Property{},
 		}
 
-		assert.PanicsWithValue(t, "unable to decode textures", func() {
+		assert.PanicsWithError(t, "unable to find the textures property", func() {
 			storage := NewInMemoryTexturesStorage()
 			storage.StoreTextures("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx", toStore)
 		})