resolve possible collision for answlog filepath among several pools

commit_hash:8bcdbc50a0c1f8630d5357454a737fb74606b3a3

Author: Digrinch

components/guns/grpc/core.go

@@ -77,7 +77,6 @@ func DefaultGunConfig() GunConfig {
 		Target: "default target",
 		AnswLog: answlog.Config{
 			Enabled: false,
-			Path:    "answ.log",
 			Filter:  filter.FilterAll,
 			Sampling: answlog.Sampling{
 				Enabled: true,

components/guns/grpc/scenario/core.go

@@ -42,7 +42,6 @@ func DefaultGunConfig() GunConfig {
 		Target: "default target",
 		AnswLog: answlog.Config{
 			Enabled: false,
-			Path:    "answ.log",
 			Filter:  filter.FilterAll,
 			Sampling: answlog.Sampling{
 				Enabled: true,

components/guns/http/connect.go

@@ -51,7 +51,6 @@ func DefaultConnectGunConfig() GunConfig {
 		},
 		AnswLog: answlog.Config{
 			Enabled: false,
-			Path:    "answ.log",
 			Filter:  filter.FilterAll,
 			Sampling: answlog.Sampling{
 				Enabled: true,

components/guns/http/http.go

@@ -93,7 +93,6 @@ func DefaultHTTPGunConfig() GunConfig {
 		},
 		AnswLog: answlog.Config{
 			Enabled: false,
-			Path:    "answ.log",
 			Filter:  filter.FilterAll,
 			Sampling: answlog.Sampling{
 				Enabled: true,

lib/answlog/logger.go

@@ -97,9 +97,13 @@ func Init(path string, enabled bool, opts ...LoggerOpt) *Logger {
 }
 
 func getAnswWriter(path string) zapcore.WriteSyncer {
-	if path == "" {
-		path = "./answ.log"
+	var file *os.File
+	if path != "" {
+		file, _ = os.Create(path)
+	} else {
+		pattern := "answ_" + "*" + ".log"
+		file, _ = os.CreateTemp(".", pattern)
 	}
-	file, _ := os.Create(path)
+
 	return zapcore.AddSync(file)
 }