refactor: separate core components and improve session & server handling

proto/proto.go

@@ -0,0 +1,50 @@
+/*
+Package proto provides byte-level interaction with HTTP request payload.
+
+Example of HTTP payload for future references, new line symbols escaped:
+
+	POST /upload HTTP/1.1\r\n
+	User-Agent: Gor\r\n
+	Content-Length: 11\r\n
+	\r\n
+	Hello world
+
+	GET /index.html HTTP/1.1\r\n
+	User-Agent: Gor\r\n
+	\r\n
+	\r\n
+
+https://github.com/buger/goreplay/blob/master/proto/proto.go
+*/
+package proto
+
+import (
+	"bytes"
+	"net/http"
+)
+
+var Methods = [...]string{
+	http.MethodConnect, http.MethodDelete, http.MethodGet,
+	http.MethodHead, http.MethodOptions, http.MethodPatch,
+	http.MethodPost, http.MethodPut, http.MethodTrace,
+}
+
+func Method(payload []byte) []byte {
+	end := bytes.IndexByte(payload, ' ')
+	if end == -1 {
+		return nil
+	}
+
+	return payload[:end]
+}
+
+func IsHttpRequest(payload []byte) bool {
+	method := string(Method(payload))
+	var methodFound bool
+	for _, m := range Methods {
+		if methodFound = method == m; methodFound {
+			break
+		}
+	}
+	return methodFound
+}