lock on every http req BUT LOCKS ON TELEMETRY SO BEWARE

src/device/input/parse/v01/config.go

@@ -2,12 +2,14 @@ package v01
 
 import (
 	"encoding/json"
+	"sync"
 
 	patch "github.com/evanphx/json-patch/v5"
 )
 
 type (
 	config struct {
+		lock     *sync.Mutex
 		Feedback configFeedback
 		Users    map[string]configUser
 		Players  []configPlayer
@@ -33,6 +35,8 @@ type (
 )
 
 func (cfg config) WithPatch(v interface{}) config {
+	cfg.lock.Lock()
+	defer cfg.lock.Unlock()
 	originalData, _ := json.Marshal(cfg)
 	patchData, _ := json.Marshal(v)
 	patcher, err := patch.DecodePatch(patchData)

src/device/input/parse/v01/config_test.go

@@ -2,6 +2,7 @@ package v01
 
 import (
 	"fmt"
+	"sync"
 	"testing"
 )
 
@@ -70,7 +71,10 @@ func TestConfigPatch(t *testing.T) {
 	for name, d := range cases {
 		c := d
 		t.Run(name, func(t *testing.T) {
+			c.cfg.lock = &sync.Mutex{}
 			got := c.cfg.WithPatch(c.patch)
+			got.lock = nil
+			c.want.lock = nil
 			if fmt.Sprintf("%+v", got) != fmt.Sprintf("%+v", c.want) {
 				t.Errorf("(%+v).Patch(%+v) want %+v, got %+v", c.cfg, c.patch, c.want, got)
 			}

src/device/input/parse/v01/server.go

@@ -29,6 +29,8 @@ func (v01 *V01) _listen() {
 	s := &http.Server{
 		Addr: v01.cfg.Feedback.Addr,
 		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			v01.cfg.lock.Lock()
+			defer v01.cfg.lock.Unlock()
 			if r.Method == http.MethodGet {
 				mutex.Lock()
 				defer mutex.Unlock()

src/device/input/parse/v01/server_test.go

@@ -7,6 +7,7 @@ import (
 	"os"
 	"path"
 	"strings"
+	"sync"
 	"testing"
 
 	"gopkg.in/yaml.v2"
@@ -53,6 +54,7 @@ func TestPatchConfig(t *testing.T) {
 					FlagParseV01Config = p
 				}
 				v01 := &V01{cfg: c.was}
+				v01.cfg.lock = &sync.Mutex{}
 
 				w := httptest.NewRecorder()
 				r := httptest.NewRequest(http.MethodPatch, "/config", strings.NewReader(c.patch))

src/device/input/parse/v01/v01.go

@@ -8,6 +8,7 @@ import (
 	"mayhem-party/src/device/input/button"
 	"mayhem-party/src/device/input/raw"
 	"os"
+	"sync"
 	"time"
 
 	"gopkg.in/yaml.v2"
@@ -29,6 +30,7 @@ type (
 
 func NewV01(ctx context.Context, src raw.Raw) *V01 {
 	var cfg config
+	cfg.lock = &sync.Mutex{}
 	b, _ := ioutil.ReadFile(FlagParseV01Config)
 	yaml.Unmarshal(b, &cfg)
 	ctx, can := context.WithCancel(ctx)
@@ -70,6 +72,8 @@ func (v01 *V01) Read() []button.Button {
 }
 
 func (v01 *V01) telemetry(msg message) {
+	v01.cfg.lock.Lock()
+	defer v01.cfg.lock.Unlock()
 	if v01.cfg.Users == nil {
 		v01.cfg.Users = map[string]configUser{}
 	}