Chore: pass staticcheck

adapters/outbound/base.go

@@ -13,10 +13,6 @@ import (
 	C "github.com/Dreamacro/clash/constant"
 )
 
-var (
-	defaultURLTestTimeout = time.Second * 5
-)
-
 type Base struct {
 	name string
 	addr string

adapters/outbound/parser.go

@@ -11,11 +11,13 @@ func ParseProxy(mapping map[string]interface{}) (C.Proxy, error) {
 	decoder := structure.NewDecoder(structure.Option{TagName: "proxy", WeaklyTypedInput: true})
 	proxyType, existType := mapping["type"].(string)
 	if !existType {
-		return nil, fmt.Errorf("Missing type")
+		return nil, fmt.Errorf("missing type")
 	}
 
-	var proxy C.ProxyAdapter
-	err := fmt.Errorf("Cannot parse")
+	var (
+		proxy C.ProxyAdapter
+		err   error
+	)
 	switch proxyType {
 	case "ss":
 		ssOption := &ShadowSocksOption{}
@@ -72,7 +74,7 @@ func ParseProxy(mapping map[string]interface{}) (C.Proxy, error) {
 		}
 		proxy, err = NewTrojan(*trojanOption)
 	default:
-		return nil, fmt.Errorf("Unsupport proxy type: %s", proxyType)
+		return nil, fmt.Errorf("unsupport proxy type: %s", proxyType)
 	}
 
 	if err != nil {

adapters/outboundgroup/parser.go

@@ -12,7 +12,6 @@ import (
 var (
 	errFormat            = errors.New("format error")
 	errType              = errors.New("unsupport type")
-	errMissUse           = errors.New("`use` field should not be empty")
 	errMissProxy         = errors.New("`use` or `proxies` missing")
 	errMissHealthCheck   = errors.New("`url` or `interval` missing")
 	errDuplicateProvider = errors.New("`duplicate provider name")
@@ -63,6 +62,10 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 
 			providers = append(providers, pd)
 		} else {
+			if _, ok := providersMap[groupName]; ok {
+				return nil, errDuplicateProvider
+			}
+
 			// select don't need health check
 			if groupOption.Type == "select" || groupOption.Type == "relay" {
 				hc := provider.NewHealthCheck(ps, "", 0)

adapters/outboundgroup/relay.go

@@ -22,7 +22,7 @@ type Relay struct {
 func (r *Relay) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
 	proxies := r.proxies(metadata)
 	if len(proxies) == 0 {
-		return nil, errors.New("Proxy does not exist")
+		return nil, errors.New("proxy does not exist")
 	}
 	first := proxies[0]
 	last := proxies[len(proxies)-1]

adapters/outboundgroup/selector.go

@@ -64,7 +64,7 @@ func (s *Selector) Set(name string) error {
 		}
 	}
 
-	return errors.New("Proxy does not exist")
+	return errors.New("proxy not exist")
 }
 
 func (s *Selector) Unwrap(metadata *C.Metadata) C.Proxy {

adapters/provider/provider.go

@@ -120,20 +120,20 @@ func proxiesParse(buf []byte) (interface{}, error) {
 	}
 
 	if schema.Proxies == nil {
-		return nil, errors.New("File must have a `proxies` field")
+		return nil, errors.New("file must have a `proxies` field")
 	}
 
 	proxies := []C.Proxy{}
 	for idx, mapping := range schema.Proxies {
 		proxy, err := outbound.ParseProxy(mapping)
 		if err != nil {
-			return nil, fmt.Errorf("Proxy %d error: %w", idx, err)
+			return nil, fmt.Errorf("proxy %d error: %w", idx, err)
 		}
 		proxies = append(proxies, proxy)
 	}
 
 	if len(proxies) == 0 {
-		return nil, errors.New("File doesn't have any valid proxy")
+		return nil, errors.New("file doesn't have any valid proxy")
 	}
 
 	return proxies, nil

common/pool/alloc.go

@@ -55,6 +55,8 @@ func (alloc *Allocator) Put(buf []byte) error {
 	if cap(buf) == 0 || cap(buf) > 65536 || cap(buf) != 1<<bits {
 		return errors.New("allocator Put() incorrect buffer size")
 	}
+
+	//lint:ignore SA6002 ignore temporarily
 	alloc.buffers[bits].Put(buf)
 	return nil
 }

common/pool/alloc_test.go

@@ -25,11 +25,11 @@ func TestAllocGet(t *testing.T) {
 func TestAllocPut(t *testing.T) {
 	alloc := NewAllocator()
 	assert.NotNil(t, alloc.Put(nil), "put nil misbehavior")
-	assert.NotNil(t, alloc.Put(make([]byte, 3, 3)), "put elem:3 []bytes misbehavior")
-	assert.Nil(t, alloc.Put(make([]byte, 4, 4)), "put elem:4 []bytes misbehavior")
+	assert.NotNil(t, alloc.Put(make([]byte, 3)), "put elem:3 []bytes misbehavior")
+	assert.Nil(t, alloc.Put(make([]byte, 4)), "put elem:4 []bytes misbehavior")
 	assert.Nil(t, alloc.Put(make([]byte, 1023, 1024)), "put elem:1024 []bytes misbehavior")
-	assert.Nil(t, alloc.Put(make([]byte, 65536, 65536)), "put elem:65536 []bytes misbehavior")
-	assert.NotNil(t, alloc.Put(make([]byte, 65537, 65537)), "put elem:65537 []bytes misbehavior")
+	assert.Nil(t, alloc.Put(make([]byte, 65536)), "put elem:65536 []bytes misbehavior")
+	assert.NotNil(t, alloc.Put(make([]byte, 65537)), "put elem:65537 []bytes misbehavior")
 }
 
 func TestAllocPutThenGet(t *testing.T) {

common/singledo/singledo.go

@@ -24,6 +24,8 @@ type Result struct {
 	Err error
 }
 
+// Do single.Do likes sync.singleFilght
+//lint:ignore ST1008 it likes sync.singleFilght
 func (s *Single) Do(fn func() (interface{}, error)) (v interface{}, err error, shared bool) {
 	s.mux.Lock()
 	now := time.Now()

component/dialer/dialer.go

@@ -147,9 +147,7 @@ func dualStackDialContext(ctx context.Context, network, address string) (net.Con
 	go startRacer(ctx, network+"4", host, false)
 	go startRacer(ctx, network+"6", host, true)
 
-	for {
-		select {
-		case res := <-results:
+	for res := range results {
 		if res.error == nil {
 			return res.Conn, nil
 		}
@@ -170,5 +168,6 @@ func dualStackDialContext(ctx context.Context, network, address string) (net.Con
 			}
 		}
 	}
-	}
+
+	return nil, errors.New("never touched")
 }

component/snell/snell.go

@@ -46,7 +46,7 @@ func (s *Snell) Read(b []byte) (int, error) {
 	if s.buffer[0] == CommandTunnel {
 		return s.Conn.Read(b)
 	} else if s.buffer[0] != CommandError {
-		return 0, errors.New("Command not support")
+		return 0, errors.New("command not support")
 	}
 
 	// CommandError

component/ssr/obfs/tls12_ticket_auth.go

@@ -287,5 +287,4 @@ func packData(buffer *bytes.Buffer, suffix []byte) {
 	binary.BigEndian.PutUint16(d[3:5], uint16(len(suffix)&0xFFFF))
 	buffer.Write(d)
 	buffer.Write(suffix)
-	return
 }

component/ssr/protocol/auth_chain_a.go

@@ -282,7 +282,6 @@ func (a *authChain) packData(outData []byte, data []byte, randLength int) {
 	binary.LittleEndian.PutUint32(key[userKeyLen:], a.chunkID)
 	a.lastClientHash = a.hmac(key, outData[:outLength])
 	copy(outData[outLength:], a.lastClientHash[:2])
-	return
 }
 
 const authHeadLength = 4 + 8 + 4 + 16 + 4

component/vmess/aead.go

@@ -86,7 +86,7 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 
 	size := int(binary.BigEndian.Uint16(r.sizeBuf))
 	if size > maxSize {
-		return 0, errors.New("Buffer is larger than standard")
+		return 0, errors.New("buffer is larger than standard")
 	}
 
 	buf := pool.Get(size)

component/vmess/chunk.go

@@ -47,7 +47,7 @@ func (cr *chunkReader) Read(b []byte) (int, error) {
 
 	size := int(binary.BigEndian.Uint16(cr.sizeBuf))
 	if size > maxSize {
-		return 0, errors.New("Buffer is larger than standard")
+		return 0, errors.New("buffer is larger than standard")
 	}
 
 	if len(b) >= size {

component/vmess/vmess.go

@@ -1,12 +1,10 @@
 package vmess
 
 import (
-	"crypto/tls"
 	"fmt"
 	"math/rand"
 	"net"
 	"runtime"
-	"sync"
 
 	"github.com/gofrs/uuid"
 )
@@ -37,11 +35,6 @@ var CipherMapping = map[string]byte{
 	"chacha20-poly1305": SecurityCHACHA20POLY1305,
 }
 
-var (
-	clientSessionCache tls.ClientSessionCache
-	once               sync.Once
-)
-
 // Command types
 const (
 	CommandTCP byte = 1
@@ -106,7 +99,7 @@ func NewClient(config Config) (*Client, error) {
 			security = SecurityAES128GCM
 		}
 	default:
-		return nil, fmt.Errorf("Unknown security type: %s", config.Security)
+		return nil, fmt.Errorf("unknown security type: %s", config.Security)
 	}
 
 	return &Client{

component/vmess/websocket.go

@@ -73,7 +73,7 @@ func (wsc *websocketConn) Close() error {
 		errors = append(errors, err.Error())
 	}
 	if len(errors) > 0 {
-		return fmt.Errorf("Failed to close connection: %s", strings.Join(errors, ","))
+		return fmt.Errorf("failed to close connection: %s", strings.Join(errors, ","))
 	}
 	return nil
 }
@@ -159,7 +159,7 @@ func StreamWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 		if resp != nil {
 			reason = resp.Status
 		}
-		return nil, fmt.Errorf("Dial %s error: %s", uri.Host, reason)
+		return nil, fmt.Errorf("dial %s error: %s", uri.Host, reason)
 	}
 
 	return &websocketConn{

config/config.go

@@ -264,11 +264,11 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 	for idx, mapping := range proxiesConfig {
 		proxy, err := outbound.ParseProxy(mapping)
 		if err != nil {
-			return nil, nil, fmt.Errorf("Proxy %d: %w", idx, err)
+			return nil, nil, fmt.Errorf("proxy %d: %w", idx, err)
 		}
 
 		if _, exist := proxies[proxy.Name()]; exist {
-			return nil, nil, fmt.Errorf("Proxy %s is the duplicate name", proxy.Name())
+			return nil, nil, fmt.Errorf("proxy %s is the duplicate name", proxy.Name())
 		}
 		proxies[proxy.Name()] = proxy
 		proxyList = append(proxyList, proxy.Name())
@@ -278,7 +278,7 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 	for idx, mapping := range groupsConfig {
 		groupName, existName := mapping["name"].(string)
 		if !existName {
-			return nil, nil, fmt.Errorf("ProxyGroup %d: missing name", idx)
+			return nil, nil, fmt.Errorf("proxy group %d: missing name", idx)
 		}
 		proxyList = append(proxyList, groupName)
 	}
@@ -313,12 +313,12 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 	for idx, mapping := range groupsConfig {
 		group, err := outboundgroup.ParseProxyGroup(mapping, proxies, providersMap)
 		if err != nil {
-			return nil, nil, fmt.Errorf("ProxyGroup[%d]: %w", idx, err)
+			return nil, nil, fmt.Errorf("proxy group[%d]: %w", idx, err)
 		}
 
 		groupName := group.Name()
 		if _, exist := proxies[groupName]; exist {
-			return nil, nil, fmt.Errorf("ProxyGroup %s: the duplicate name", groupName)
+			return nil, nil, fmt.Errorf("proxy group %s: the duplicate name", groupName)
 		}
 
 		proxies[groupName] = outbound.NewProxy(group)
@@ -373,11 +373,11 @@ func parseRules(cfg *RawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 			target = rule[2]
 			params = rule[3:]
 		default:
-			return nil, fmt.Errorf("Rules[%d] [%s] error: format invalid", idx, line)
+			return nil, fmt.Errorf("rules[%d] [%s] error: format invalid", idx, line)
 		}
 
 		if _, ok := proxies[target]; !ok {
-			return nil, fmt.Errorf("Rules[%d] [%s] error: proxy [%s] not found", idx, line, target)
+			return nil, fmt.Errorf("rules[%d] [%s] error: proxy [%s] not found", idx, line, target)
 		}
 
 		rule = trimArr(rule)
@@ -389,7 +389,7 @@ func parseRules(cfg *RawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 				log.Warnln("Rules[%d] [%s] don't support current OS, skip", idx, line)
 				continue
 			}
-			return nil, fmt.Errorf("Rules[%d] [%s] error: %s", idx, line, parseErr.Error())
+			return nil, fmt.Errorf("rules[%d] [%s] error: %s", idx, line, parseErr.Error())
 		}
 
 		rules = append(rules, parsed)
@@ -499,7 +499,7 @@ func parseFallbackIPCIDR(ips []string) ([]*net.IPNet, error) {
 
 func parseDNS(cfg RawDNS, hosts *trie.DomainTrie) (*DNS, error) {
 	if cfg.Enable && len(cfg.NameServer) == 0 {
-		return nil, fmt.Errorf("If DNS configuration is turned on, NameServer cannot be empty")
+		return nil, fmt.Errorf("if DNS configuration is turned on, NameServer cannot be empty")
 	}
 
 	dnsCfg := &DNS{

config/initial.go

@@ -32,18 +32,18 @@ func initMMDB() error {
 	if _, err := os.Stat(C.Path.MMDB()); os.IsNotExist(err) {
 		log.Infoln("Can't find MMDB, start download")
 		if err := downloadMMDB(C.Path.MMDB()); err != nil {
-			return fmt.Errorf("Can't download MMDB: %s", err.Error())
+			return fmt.Errorf("can't download MMDB: %s", err.Error())
 		}
 	}
 
 	if !mmdb.Verify() {
 		log.Warnln("MMDB invalid, remove and download")
 		if err := os.Remove(C.Path.MMDB()); err != nil {
-			return fmt.Errorf("Can't remove invalid MMDB: %s", err.Error())
+			return fmt.Errorf("can't remove invalid MMDB: %s", err.Error())
 		}
 
 		if err := downloadMMDB(C.Path.MMDB()); err != nil {
-			return fmt.Errorf("Can't download MMDB: %s", err.Error())
+			return fmt.Errorf("can't download MMDB: %s", err.Error())
 		}
 	}
 
@@ -55,7 +55,7 @@ func Init(dir string) error {
 	// initial homedir
 	if _, err := os.Stat(dir); os.IsNotExist(err) {
 		if err := os.MkdirAll(dir, 0777); err != nil {
-			return fmt.Errorf("Can't create config directory %s: %s", dir, err.Error())
+			return fmt.Errorf("can't create config directory %s: %s", dir, err.Error())
 		}
 	}
 
@@ -64,7 +64,7 @@ func Init(dir string) error {
 		log.Infoln("Can't find config, create a initial config file")
 		f, err := os.OpenFile(C.Path.Config(), os.O_CREATE|os.O_WRONLY, 0644)
 		if err != nil {
-			return fmt.Errorf("Can't create file %s: %s", C.Path.Config(), err.Error())
+			return fmt.Errorf("can't create file %s: %s", C.Path.Config(), err.Error())
 		}
 		f.Write([]byte(`port: 7890`))
 		f.Close()
@@ -72,7 +72,7 @@ func Init(dir string) error {
 
 	// initial mmdb
 	if err := initMMDB(); err != nil {
-		return fmt.Errorf("Can't initial MMDB: %w", err)
+		return fmt.Errorf("can't initial MMDB: %w", err)
 	}
 	return nil
 }

config/utils.go

@@ -15,15 +15,6 @@ func trimArr(arr []string) (r []string) {
 	return
 }
 
-func or(pointers ...*int) *int {
-	for _, p := range pointers {
-		if p != nil {
-			return p
-		}
-	}
-	return pointers[len(pointers)-1]
-}
-
 // Check if ProxyGroups form DAG(Directed Acyclic Graph), and sort all ProxyGroups by dependency order.
 // Meanwhile, record the original index in the config file.
 // If loop is detected, return an error with location of loop.
@@ -153,5 +144,5 @@ func proxyGroupsDagSort(groupsConfig []map[string]interface{}) error {
 		loopElements = append(loopElements, name)
 		delete(graph, name)
 	}
-	return fmt.Errorf("Loop is detected in ProxyGroup, please check following ProxyGroups: %v", loopElements)
+	return fmt.Errorf("loop is detected in ProxyGroup, please check following ProxyGroups: %v", loopElements)
 }

dns/middleware.go

@@ -55,7 +55,6 @@ func withHosts(hosts *trie.DomainTrie) middleware {
 			msg.RecursionAvailable = true
 
 			w.WriteMsg(msg)
-			return
 		}
 	}
 }
@@ -99,7 +98,6 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			msg.RecursionAvailable = true
 
 			w.WriteMsg(msg)
-			return
 		}
 	}
 }
@@ -130,7 +128,6 @@ func withResolver(resolver *Resolver) handler {
 		msg.SetRcode(r, msg.Rcode)
 		msg.Authoritative = true
 		w.WriteMsg(msg)
-		return
 	}
 }
 

dns/resolver.go

@@ -106,7 +106,7 @@ func (r *Resolver) Exchange(m *D.Msg) (msg *D.Msg, err error) {
 			setMsgTTL(msg, uint32(1)) // Continue fetch
 			go r.exchangeWithoutCache(m)
 		} else {
-			setMsgTTL(msg, uint32(expireTime.Sub(time.Now()).Seconds()))
+			setMsgTTL(msg, uint32(time.Until(expireTime).Seconds()))
 		}
 		return
 	}
@@ -203,7 +203,7 @@ func (r *Resolver) batchExchange(clients []dnsClient, m *D.Msg) (msg *D.Msg, err
 
 	elm := fast.Wait()
 	if elm == nil {
-		err := errors.New("All DNS requests failed")
+		err := errors.New("all DNS requests failed")
 		if fErr := fast.Error(); fErr != nil {
 			err = fmt.Errorf("%w, first error: %s", err, fErr.Error())
 		}

hub/executor/executor.go

@@ -34,7 +34,7 @@ func readConfig(path string) ([]byte, error) {
 	}
 
 	if len(data) == 0 {
-		return nil, fmt.Errorf("Configuration file %s is empty", path)
+		return nil, fmt.Errorf("configuration file %s is empty", path)
 	}
 
 	return data, err
@@ -101,7 +101,7 @@ func GetGeneral() *config.General {
 func updateExperimental(c *config.Config) {}
 
 func updateDNS(c *config.DNS) {
-	if c.Enable == false {
+	if !c.Enable {
 		resolver.DefaultResolver = nil
 		tunnel.SetResolver(nil)
 		dns.ReCreateServer("", nil)

log/log.go

@@ -64,7 +64,6 @@ func Subscribe() observable.Subscription {
 
 func UnSubscribe(sub observable.Subscription) {
 	source.UnSubscribe(sub)
-	return
 }
 
 func Level() LogLevel {

main.go

@@ -10,7 +10,6 @@ import (
 	"syscall"
 
 	"github.com/Dreamacro/clash/config"
-	"github.com/Dreamacro/clash/constant"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/hub"
 	"github.com/Dreamacro/clash/hub/executor"
@@ -76,10 +75,10 @@ func main() {
 	if testConfig {
 		if _, err := executor.Parse(); err != nil {
 			log.Errorln(err.Error())
-			fmt.Printf("configuration file %s test failed\n", constant.Path.Config())
+			fmt.Printf("configuration file %s test failed\n", C.Path.Config())
 			os.Exit(1)
 		}
-		fmt.Printf("configuration file %s test is successful\n", constant.Path.Config())
+		fmt.Printf("configuration file %s test is successful\n", C.Path.Config())
 		return
 	}
 

proxy/http/server.go

@@ -60,6 +60,7 @@ func (l *HttpListener) Address() string {
 func canActivate(loginStr string, authenticator auth.Authenticator, cache *cache.Cache) (ret bool) {
 	if result := cache.Get(loginStr); result != nil {
 		ret = result.(bool)
+		return
 	}
 	loginData, err := base64.StdEncoding.DecodeString(loginStr)
 	login := strings.Split(string(loginData), ":")
@@ -80,7 +81,7 @@ func HandleConn(conn net.Conn, cache *cache.Cache) {
 	authenticator := authStore.Authenticator()
 	if authenticator != nil {
 		if authStrings := strings.Split(request.Header.Get("Proxy-Authorization"), " "); len(authStrings) != 2 {
-			_, err = conn.Write([]byte("HTTP/1.1 407 Proxy Authentication Required\r\nProxy-Authenticate: Basic\r\n\r\n"))
+			conn.Write([]byte("HTTP/1.1 407 Proxy Authentication Required\r\nProxy-Authenticate: Basic\r\n\r\n"))
 			conn.Close()
 			return
 		} else if !canActivate(authStrings[1], authenticator, cache) {

proxy/listener.go

@@ -30,14 +30,8 @@ var (
 	httpMux  sync.Mutex
 	redirMux sync.Mutex
 	mixedMux sync.Mutex
-	tunMux   sync.Mutex
 )
 
-type listener interface {
-	Close()
-	Address() string
-}
-
 type Ports struct {
 	Port      int `json:"port"`
 	SocksPort int `json:"socks-port"`

proxy/redir/utils.go

@@ -34,5 +34,4 @@ func (c *packet) LocalAddr() net.Addr {
 
 func (c *packet) Drop() {
 	pool.Put(c.buf)
-	return
 }

proxy/socks/utils.go

@@ -34,5 +34,4 @@ func (c *packet) LocalAddr() net.Addr {
 
 func (c *packet) Drop() {
 	pool.Put(c.bufRef)
-	return
 }

rules/base.go

@@ -6,7 +6,6 @@ import (
 
 var (
 	errPayload            = errors.New("payload error")
-	errParams             = errors.New("params error")
 	ErrPlatformNotSupport = errors.New("not support on this platform")
 	ErrInvalidNetwork     = errors.New("invalid network")
 

tunnel/connection.go

@@ -121,7 +121,7 @@ func handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string, fAddr n
 			from = fAddr
 		}
 
-		n, err = packet.WriteBack(buf[:n], from)
+		_, err = packet.WriteBack(buf[:n], from)
 		if err != nil {
 			return
 		}