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/*
* This file is part of caronte (https://github.com/eciavatta/caronte).
* Copyright (c) 2020 Emiliano Ciavatta.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"context"
log "github.com/sirupsen/logrus"
"strings"
"sync"
"time"
)
const (
secondsToNano = 1000 * 1000 * 1000
maxSearchTimeout = 10 * secondsToNano
maxRecentSearches = 200
)
type PerformedSearch struct {
ID RowID `bson:"_id" json:"id"`
SearchOptions SearchOptions `bson:"search_options" json:"search_options"`
AffectedConnections []RowID `bson:"affected_connections" json:"-"`
AffectedConnectionsCount int `bson:"affected_connections_count" json:"affected_connections_count"`
StartedAt time.Time `bson:"started_at" json:"started_at"`
FinishedAt time.Time `bson:"finished_at" json:"finished_at"`
UpdatedAt time.Time `bson:"updated_at" json:"updated_at"`
Timeout time.Duration `bson:"timeout" json:"timeout"`
}
type SearchOptions struct {
TextSearch TextSearch `bson:"text_search" json:"text_search"`
RegexSearch RegexSearch `bson:"regex_search" json:"regex_search"`
Timeout time.Duration `bson:"timeout" json:"timeout" binding:"max=60"`
}
type TextSearch struct {
Terms []string `bson:"terms" json:"terms" binding:"isdefault|min=1,dive,min=3"`
ExcludedTerms []string `bson:"excluded_terms" json:"excluded_terms" binding:"isdefault|min=1,dive,min=3"`
ExactPhrase string `bson:"exact_phrase" json:"exact_phrase" binding:"isdefault|min=3"`
CaseSensitive bool `bson:"case_sensitive" json:"case_sensitive"`
}
type RegexSearch struct {
Pattern string `bson:"pattern" json:"pattern" binding:"isdefault|min=3"`
NotPattern string `bson:"not_pattern" json:"not_pattern" binding:"isdefault|min=3"`
CaseInsensitive bool `bson:"case_insensitive" json:"case_insensitive"`
MultiLine bool `bson:"multi_line" json:"multi_line"`
IgnoreWhitespaces bool `bson:"ignore_whitespaces" json:"ignore_whitespaces"`
DotCharacter bool `bson:"dot_character" json:"dot_character"`
}
type SearchController struct {
storage Storage
performedSearches []PerformedSearch
mutex sync.Mutex
}
func NewSearchController(storage Storage) *SearchController {
var searches []PerformedSearch
if err := storage.Find(Searches).Limit(maxRecentSearches).All(&searches); err != nil {
log.WithError(err).Panic("failed to retrieve performed searches")
}
if searches == nil {
searches = []PerformedSearch{}
}
return &SearchController{
storage: storage,
performedSearches: searches,
}
}
func (sc *SearchController) GetPerformedSearches() []PerformedSearch {
sc.mutex.Lock()
defer sc.mutex.Unlock()
return sc.performedSearches
}
func (sc *SearchController) GetPerformedSearch(id RowID) PerformedSearch {
sc.mutex.Lock()
defer sc.mutex.Unlock()
var performedSearch PerformedSearch
for _, search := range sc.performedSearches {
if search.ID == id {
performedSearch = search
}
}
return performedSearch
}
func (sc *SearchController) PerformSearch(c context.Context, options SearchOptions) PerformedSearch {
findQuery := sc.storage.Find(ConnectionStreams).Projection(OrderedDocument{{"connection_id", 1}}).Context(c)
timeout := options.Timeout * secondsToNano
if timeout <= 0 || timeout > maxSearchTimeout {
timeout = maxSearchTimeout
}
findQuery = findQuery.MaxTime(timeout)
if !options.TextSearch.isZero() {
var text string
if options.TextSearch.ExactPhrase != "" {
text = "\"" + options.TextSearch.ExactPhrase + "\""
} else {
text = strings.Join(options.TextSearch.Terms, " ")
if options.TextSearch.ExcludedTerms != nil {
text += " -" + strings.Join(options.TextSearch.ExcludedTerms, " -")
}
}
findQuery = findQuery.Filter(OrderedDocument{{"$text", UnorderedDocument{
"$search": text,
"$language": "none",
"$caseSensitive": options.TextSearch.CaseSensitive,
"$diacriticSensitive": false,
}}})
} else {
var regexOptions string
if options.RegexSearch.CaseInsensitive {
regexOptions += "i"
}
if options.RegexSearch.MultiLine {
regexOptions += "m"
}
if options.RegexSearch.IgnoreWhitespaces {
regexOptions += "x"
}
if options.RegexSearch.DotCharacter {
regexOptions += "s"
}
var regex UnorderedDocument
if options.RegexSearch.Pattern != "" {
regex = UnorderedDocument{"$regex": options.RegexSearch.Pattern, "$options": regexOptions}
} else {
regex = UnorderedDocument{"$not": UnorderedDocument{"$regex": options.RegexSearch.NotPattern, "$options": regexOptions}}
}
findQuery = findQuery.Filter(OrderedDocument{{"payload_string", regex}})
}
var connections []ConnectionStream
startedAt := time.Now()
if err := findQuery.All(&connections); err != nil {
log.WithError(err).Error("oh no")
}
affectedConnections := uniqueConnectionIds(connections)
finishedAt := time.Now()
performedSearch := PerformedSearch{
ID: NewRowID(),
SearchOptions: options,
AffectedConnections: affectedConnections,
AffectedConnectionsCount: len(affectedConnections),
StartedAt: startedAt,
FinishedAt: finishedAt,
UpdatedAt: finishedAt,
Timeout: options.Timeout,
}
if _, err := sc.storage.Insert(Searches).Context(c).One(performedSearch); err != nil {
log.WithError(err).Panic("failed to insert a new performed search")
}
sc.mutex.Lock()
sc.performedSearches = append([]PerformedSearch{performedSearch}, sc.performedSearches...)
if len(sc.performedSearches) > maxRecentSearches {
sc.performedSearches = sc.performedSearches[:200]
}
sc.mutex.Unlock()
return performedSearch
}
func (sc TextSearch) isZero() bool {
return sc.Terms == nil && sc.ExcludedTerms == nil && sc.ExactPhrase == ""
}
func (sc RegexSearch) isZero() bool {
return RegexSearch{} == sc
}
func uniqueConnectionIds(connections []ConnectionStream) []RowID {
keys := make(map[RowID]bool)
var out []RowID
for _, entry := range connections {
if _, value := keys[entry.ConnectionID]; !value {
keys[entry.ConnectionID] = true
out = append(out, entry.ConnectionID)
}
}
return out
}
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