Fix golint issues and add test

anyhttp.go

@@ -205,7 +205,7 @@ func (s *SysdConfig) GetListener() (net.Listener, error) {
 
 // Serve creates and serve a http server.
 func Serve(addr string, h http.Handler) (addrType AddressType, srv *http.Server, idler idle.Idler, done <-chan error, err error) {
-	addrType, usc, sysc, err := ParseAddress(addr)
+	addrType, usc, sysc, err := parseAddress(addr)
 	if err != nil {
 		return
 	}
@@ -215,12 +215,11 @@ func Serve(addr string, h http.Handler) (addrType AddressType, srv *http.Server,
 			return usc.GetListener()
 		} else if sysc != nil {
 			return sysc.GetListener()
-		} else {
-			if addr == "" {
-				addr = ":http"
-			}
-			return net.Listen("tcp", addr)
 		}
+		if addr == "" {
+			addr = ":http"
+		}
+		return net.Listen("tcp", addr)
 	}()
 	if err != nil {
 		return
@@ -268,8 +267,7 @@ func UnsetSystemdListenVars() {
 	_ = os.Unsetenv("LISTEN_FDNAMES")
 }
 
-func ParseAddress(addr string) (addrType AddressType, usc *UnixSocketConfig, sysc *SysdConfig, err error) {
-	// addrType = Unknown
+func parseAddress(addr string) (addrType AddressType, usc *UnixSocketConfig, sysc *SysdConfig, err error) {
 	usc = nil
 	sysc = nil
 	err = nil
@@ -302,11 +300,11 @@ func ParseAddress(addr string) (addrType AddressType, usc *UnixSocketConfig, sys
 					err = fmt.Errorf("unix socket address error. Multiple remove_existing found: %v", val)
 					return
 				}
-				if removeExisting, berr := strconv.ParseBool(val[0]); berr != nil {
+				if removeExisting, berr := strconv.ParseBool(val[0]); berr == nil {
+					usc.RemoveExisting = removeExisting
+				} else {
 					err = fmt.Errorf("unix socket address error. Bad remove_existing: %v, err: %w", val, berr)
 					return
-				} else {
-					usc.RemoveExisting = removeExisting
 				}
 			} else {
 				err = fmt.Errorf("unix socket address error. Bad option; key: %v, val: %v", key, val)
@@ -333,44 +331,44 @@ func ParseAddress(addr string) (addrType AddressType, usc *UnixSocketConfig, sys
 					err = fmt.Errorf("systemd socket fd address error. Multiple idx found: %v", val)
 					return
 				}
-				if idx, ierr := strconv.Atoi(val[0]); ierr != nil {
+				if idx, ierr := strconv.Atoi(val[0]); ierr == nil {
+					sysc.FDIndex = &idx
+				} else {
 					err = fmt.Errorf("systemd socket fd address error. Bad idx: %v, err: %w", val, ierr)
 					return
-				} else {
-					sysc.FDIndex = &idx
 				}
 			} else if key == "check_pid" {
 				if len(val) != 1 {
 					err = fmt.Errorf("systemd socket fd address error. Multiple check_pid found: %v", val)
 					return
 				}
-				if checkPID, berr := strconv.ParseBool(val[0]); berr != nil {
+				if checkPID, berr := strconv.ParseBool(val[0]); berr == nil {
+					sysc.CheckPID = checkPID
+				} else {
 					err = fmt.Errorf("systemd socket fd address error. Bad check_pid: %v, err: %w", val, berr)
 					return
-				} else {
-					sysc.CheckPID = checkPID
 				}
 			} else if key == "unset_env" {
 				if len(val) != 1 {
 					err = fmt.Errorf("systemd socket fd address error. Multiple unset_env found: %v", val)
 					return
 				}
-				if unsetEnv, berr := strconv.ParseBool(val[0]); berr != nil {
+				if unsetEnv, berr := strconv.ParseBool(val[0]); berr == nil {
+					sysc.UnsetEnv = unsetEnv
+				} else {
 					err = fmt.Errorf("systemd socket fd address error. Bad unset_env: %v, err: %w", val, berr)
 					return
-				} else {
-					sysc.UnsetEnv = unsetEnv
 				}
 			} else if key == "idle_timeout" {
 				if len(val) != 1 {
 					err = fmt.Errorf("systemd socket fd address error. Multiple idle_timeout found: %v", val)
 					return
 				}
-				if timeout, terr := time.ParseDuration(val[0]); terr != nil {
+				if timeout, terr := time.ParseDuration(val[0]); terr == nil {
+					sysc.IdleTimeout = &timeout
+				} else {
 					err = fmt.Errorf("systemd socket fd address error. Bad idle_timeout: %v, err: %w", val, terr)
 					return
-				} else {
-					sysc.IdleTimeout = &timeout
 				}
 			} else {
 				err = fmt.Errorf("systemd socket fd address error. Bad option; key: %v, val: %v", key, val)

anyhttp_test.go

@@ -0,0 +1,132 @@
+package anyhttp
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+)
+
+func Test_parseAddress(t *testing.T) {
+	tests := []struct {
+		name string // description of this test case
+		// Named input parameters for target function.
+		addr         string
+		wantAddrType AddressType
+		wantUsc      *UnixSocketConfig
+		wantSysc     *SysdConfig
+		wantErr      bool
+	}{
+		{
+			name:         "tcp port",
+			addr:         ":8080",
+			wantAddrType: TCP,
+			wantUsc:      nil,
+			wantSysc:     nil,
+			wantErr:      false,
+		},
+		{
+			name:         "unix address",
+			addr:         "unix?path=/run/foo.sock&mode=660",
+			wantAddrType: UnixSocket,
+			wantUsc: &UnixSocketConfig{
+				SocketPath:     "/run/foo.sock",
+				SocketMode:     0660,
+				RemoveExisting: true,
+			},
+			wantSysc: nil,
+			wantErr:  false,
+		},
+		{
+			name:         "systemd address",
+			addr:         "sysd?name=foo.socket",
+			wantAddrType: SystemdFD,
+			wantUsc:      nil,
+			wantSysc: &SysdConfig{
+				FDIndex:     nil,
+				FDName:      ptr("foo.socket"),
+				CheckPID:    true,
+				UnsetEnv:    true,
+				IdleTimeout: nil,
+			},
+			wantErr: false,
+		},
+		{
+			name:         "systemd address with index",
+			addr:         "sysd?idx=0&idle_timeout=30m",
+			wantAddrType: SystemdFD,
+			wantUsc:      nil,
+			wantSysc: &SysdConfig{
+				FDIndex:     ptr(0),
+				FDName:      nil,
+				CheckPID:    true,
+				UnsetEnv:    true,
+				IdleTimeout: ptr(30 * time.Minute),
+			},
+			wantErr: false,
+		},
+		{
+			name:         "systemd address. Bad example",
+			addr:         "sysd?idx=0&idle_timeout=30m&name=foo",
+			wantAddrType: SystemdFD,
+			wantUsc:      nil,
+			wantSysc:     nil,
+			wantErr:      true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			gotAddrType, gotUsc, gotSysc, gotErr := parseAddress(tt.addr)
+			if gotErr != nil {
+				if !tt.wantErr {
+					t.Errorf("parseAddress() failed: %v", gotErr)
+				}
+				return
+			}
+			if tt.wantErr {
+				t.Fatal("parseAddress() succeeded unexpectedly")
+			}
+
+			if gotAddrType != tt.wantAddrType {
+				t.Errorf("parseAddress() addrType = %v, want %v", gotAddrType, tt.wantAddrType)
+			}
+
+			if !check(gotUsc, tt.wantUsc) {
+				t.Errorf("parseAddress() Usc = %v, want %v", gotUsc, tt.wantUsc)
+			}
+			if !check(gotSysc, tt.wantSysc) {
+				if (gotSysc == nil || tt.wantSysc == nil) ||
+					!(check(gotSysc.FDIndex, tt.wantSysc.FDIndex) &&
+						check(gotSysc.FDName, tt.wantSysc.FDName) &&
+						check(gotSysc.IdleTimeout, tt.wantSysc.IdleTimeout)) {
+					t.Errorf("parseAddress() Sysc = %v, want %v", asJSON(gotSysc), asJSON(tt.wantSysc))
+				}
+			}
+		})
+	}
+}
+
+// Helpers
+
+// print value instead of pointer
+func asJSON[T any](val T) string {
+	op, err := json.Marshal(val)
+	if err != nil {
+		return err.Error()
+	}
+	return string(op)
+}
+
+func ptr[T any](val T) *T {
+	return &val
+}
+
+// nil safe equal check
+func check[T comparable](got, want *T) bool {
+	if (got == nil) != (want == nil) {
+		return false
+	}
+	if got == nil {
+		return true
+	}
+	return *got == *want
+}