Pull request: querylog: more opt

Updates 1273.

Squashed commit of the following:

commit 167c0b5acaab8a2676de2cea556c861dc0efbc72
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Apr 12 18:12:43 2021 +0300

    querylog: imp naming

commit 5010ad113e46335011a721cbcc9fc9b1fc623722
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Apr 12 17:53:41 2021 +0300

    querylog: more opt

internal/querylog/searchparams.go

@@ -5,7 +5,7 @@ import "time"
 // searchParams represent the search query sent by the client
 type searchParams struct {
 	// searchCriteria - list of search criteria that we use to get filter results
-	searchCriteria []searchCriteria
+	searchCriteria []searchCriterion
 
 	// olderThen - return entries that are older than this value
 	// if not set - disregard it and return any value
@@ -27,6 +27,22 @@ func newSearchParams() *searchParams {
 	}
 }
 
+// quickMatchClientFunc is a simplified client finder for quick matches.
+type quickMatchClientFunc = func(clientID, ip string) (c *Client)
+
+// quickMatch quickly checks if the line matches the given search parameters.
+// It returns false if the line doesn't match.  This method is only here for
+// optimisation purposes.
+func (s *searchParams) quickMatch(line string, findClient quickMatchClientFunc) (ok bool) {
+	for _, c := range s.searchCriteria {
+		if !c.quickMatch(line, findClient) {
+			return false
+		}
+	}
+
+	return true
+}
+
 // match - checks if the logEntry matches the searchParams
 func (s *searchParams) match(entry *logEntry) bool {
 	if !s.olderThan.IsZero() && entry.Time.UnixNano() >= s.olderThan.UnixNano() {