1 files changed, 103 insertions, 0 deletions
diff --git a/statistics_controller.go b/statistics_controller.go
new file mode 100644
index 0000000..29f3fec
--- /dev/null
+++ b/statistics_controller.go
@@ -0,0 +1,103 @@
+/*
+ * 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"
+	"fmt"
+	log "github.com/sirupsen/logrus"
+	"time"
+)
+
+type StatisticRecord struct {
+	RangeStart            time.Time        `json:"range_start" bson:"_id"`
+	ConnectionsPerService map[uint16]int   `json:"connections_per_service" bson:"connections_per_service"`
+	ClientBytesPerService map[uint16]int   `json:"client_bytes_per_service" bson:"client_bytes_per_service"`
+	ServerBytesPerService map[uint16]int   `json:"server_bytes_per_service" bson:"server_bytes_per_service"`
+	TotalBytesPerService  map[uint16]int   `json:"total_bytes_per_service" bson:"total_bytes_per_service"`
+	DurationPerService    map[uint16]int64 `json:"duration_per_service" bson:"duration_per_service"`
+	MatchedRules          map[string]int64 `json:"matched_rules" bson:"matched_rules"`
+}
+
+type StatisticsFilter struct {
+	RangeFrom time.Time `form:"range_from"`
+	RangeTo   time.Time `form:"range_to"`
+	Ports     []uint16  `form:"ports"`
+	RulesIDs  []string  `form:"rules_ids"`
+	Metric    string    `form:"metric"`
+}
+
+type StatisticsController struct {
+	storage         Storage
+	servicesMetrics []string
+}
+
+func NewStatisticsController(storage Storage) StatisticsController {
+	return StatisticsController{
+		storage: storage,
+		servicesMetrics: []string{"connections_per_service", "client_bytes_per_service",
+			"server_bytes_per_service", "total_bytes_per_service", "duration_per_service"},
+	}
+}
+
+func (sc *StatisticsController) GetStatistics(context context.Context, filter StatisticsFilter) []StatisticRecord {
+	var statisticRecords []StatisticRecord
+	query := sc.storage.Find(Statistics).Context(context).Sort("_id", true)
+	if !filter.RangeFrom.IsZero() {
+		query = query.Filter(OrderedDocument{{"_id", UnorderedDocument{"$lt": filter.RangeFrom}}})
+	}
+	if !filter.RangeTo.IsZero() {
+		query = query.Filter(OrderedDocument{{"_id", UnorderedDocument{"$gt": filter.RangeTo}}})
+	}
+	for _, port := range filter.Ports {
+		for _, metric := range sc.servicesMetrics {
+			if filter.Metric == "" || filter.Metric == metric {
+				query = query.Projection(OrderedDocument{{fmt.Sprintf("%s.%d", metric, port), 1}})
+			}
+		}
+
+	}
+	if filter.Metric != "" && len(filter.Ports) == 0 {
+		for _, metric := range sc.servicesMetrics {
+			if filter.Metric == metric {
+				query = query.Projection(OrderedDocument{{metric, 1}})
+			}
+		}
+	}
+	for _, ruleID := range filter.RulesIDs {
+		if filter.Metric == "" || filter.Metric == "matched_rules" {
+			query = query.Projection(OrderedDocument{{fmt.Sprintf("matched_rules.%s", ruleID), 1}})
+		}
+
+	}
+	if filter.Metric != "" && len(filter.RulesIDs) == 0 {
+		if filter.Metric == "matched_rules" {
+			query = query.Projection(OrderedDocument{{"matched_rules", 1}})
+		}
+	}
+
+	if err := query.All(&statisticRecords); err != nil {
+		log.WithError(err).WithField("filter", filter).Error("failed to retrieve statistics")
+		return []StatisticRecord{}
+	}
+	if statisticRecords == nil {
+		return []StatisticRecord{}
+	}
+
+	return statisticRecords
+}