AdGuardHome/internal/querylog/searchparams.go

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package querylog
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 []searchCriterion
// olderThen - return entries that are older than this value
// if not set - disregard it and return any value
olderThan time.Time
offset int // offset for the search
limit int // limit the number of records returned
maxFileScanEntries int // maximum log entries to scan in query log files. if 0 - no limit
}
// newSearchParams - creates an empty instance of searchParams
func newSearchParams() *searchParams {
return &searchParams{
// default max log entries to return
limit: 500,
// by default, we scan up to 50k entries at once
maxFileScanEntries: 50000,
}
}
// 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() {
// Ignore entries newer than what was requested
return false
}
for _, c := range s.searchCriteria {
if !c.match(entry) {
return false
}
}
return true
}