From e905618113309eaba7227ff1328a20f6846e4afd Mon Sep 17 00:00:00 2001
From: Emiliano Ciavatta
Date: Mon, 5 Oct 2020 23:46:18 +0200
Subject: Implement timeline

---
 statistics_controller.go | 71 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 statistics_controller.go

(limited to 'statistics_controller.go')

diff --git a/statistics_controller.go b/statistics_controller.go
new file mode 100644
index 0000000..65c7d58
--- /dev/null
+++ b/statistics_controller.go
@@ -0,0 +1,71 @@
+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"`
+	DurationPerService    map[uint16]int64 `json:"duration_per_service" bson:"duration_per_service"`
+}
+
+type StatisticsFilter struct {
+	RangeFrom time.Time `form:"range_from"`
+	RangeTo   time.Time `form:"range_to"`
+	Ports     []uint16  `form:"ports"`
+	Metric    string    `form:"metric"`
+}
+
+type StatisticsController struct {
+	storage Storage
+	metrics []string
+}
+
+func NewStatisticsController(storage Storage) StatisticsController {
+	return StatisticsController{
+		storage: storage,
+		metrics: []string{"connections_per_service", "client_bytes_per_service",
+			"server_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)
+	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.metrics {
+			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.metrics {
+			if filter.Metric == metric {
+				query = query.Projection(OrderedDocument{{metric, 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
+}
-- 
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