fix(lint):err check rules and fix config

.golangci.yml

@@ -1,35 +1,43 @@
-version: 2
+version: "2"
 
 run:
-    timeout: 5m
+  timeout: 5m
-    tests: true
+  tests: true
 
 linters:
-    disable-all: true
+  default: none
-    enable:
+  enable:
-        - errcheck
+    - errcheck
-        - govet
+    - govet
-        - staticcheck
+    - staticcheck
-        - errorlint
+    - errorlint
-        - errname
+    - errname
-        - bodyclose
+    - bodyclose
-        - sqlclosecheck
+    - sqlclosecheck
-        - noctx
+    - noctx
-        - ineffassign
+    - ineffassign
-        - unconvert
+    - unconvert
-        - bidichk
+    - bidichk
-
+  settings:
-linters-settings:
     errcheck:
-        check-type-assertions: true
+      check-type-assertions: true
-        check-blank: true
+      check-blank: false
-
+      exclude-functions:
+        - fmt.Print
+        - fmt.Println
+        - fmt.Printf
+        - fmt.Fprint
+        - fmt.Fprintln
+        - fmt.Fprintf
     govet:
-        enable-all: true
+      enable-all: true
-        disable:
+      disable:
-            - fieldalignment
+        - fieldalignment
+  exclusions:
+    rules:
+      - linters: [errcheck]
+        source: "^\\s*defer "
 
 issues:
-    exclude-use-default: false
+  max-issues-per-linter: 0
-    max-issues-per-linter: 0
+  max-same-issues: 0
-    max-same-issues: 0

ipc/server.go

@@ -24,7 +24,10 @@ func NewServer() (*Server, error) {
 		return nil, err
 	}
 
-	localAddr := conn.LocalAddr().(*net.UDPAddr)
+	localAddr, ok := conn.LocalAddr().(*net.UDPAddr)
+	if !ok {
+		return nil, net.InvalidAddrError("not a UDP address")
+	}
 
 	s := &Server{
 		conn:       conn,