feat(outputs): add support for hostname, tags, custom fields, and tem…

…plated fields to TimesacleDB output

Signed-off-by: alika <alika.larsen@gmail.com>

README.md

@@ -1254,17 +1254,43 @@ permissions to access the resources you selected to use, like `SQS`, `Lambda`,
 To use TimescaleDB you should create the Hypertable first, following this example
 
 ```sql
-CREATE TABLE falco_events (
+CREATE TABLE falcosidekick_events (
 	time TIMESTAMPTZ NOT NULL,
 	rule TEXT,
 	priority VARCHAR(20),
 	source VARCHAR(20),
-	output TEXT
+	output TEXT,
+	tags TEXT,
+	hostname TEXT,
 );
-SELECT create_hypertable('falco_events', 'time');
+SELECT create_hypertable('falcosidekick_events', 'time');
 ```
 
-The name from the table should match with the `hypertable` output configuration.
+To support [`customfields` or `templatedfields`](#yaml-file) you need to ensure you add the corresponding fields to the Hypertable, for example:
+
+```yaml
+customfields:
+  custom_field_1: "custom-value-1"
+templatedfields:
+  k8s_namespace: '{{ or (index . "k8s.ns.name") "null" }}'
+```
+
+```sql
+CREATE TABLE falcosidekick_events (
+	time TIMESTAMPTZ NOT NULL,
+	rule TEXT,
+	priority VARCHAR(20),
+	source VARCHAR(20),
+	output TEXT,
+	tags TEXT,
+	hostname TEXT,
+	custom_field_1 TEXT,
+	k8s_namespace TEXT
+);
+SELECT create_hypertable('falcosidekick_events', 'time');
+```
+
+The name from the table should match with the `hypertable` output configuration. The TimescaleDB output processor will insert SQL nulls when it encounters a string field value of `"null"`.
 
 ## Examples
 

config.go

@@ -19,13 +19,14 @@ import (
 
 func getConfig() *types.Configuration {
 	c := &types.Configuration{
-		Customfields:  make(map[string]string),
-		Grafana:       types.GrafanaOutputConfig{CustomHeaders: make(map[string]string)},
-		Loki:          types.LokiOutputConfig{CustomHeaders: make(map[string]string)},
-		Elasticsearch: types.ElasticsearchOutputConfig{CustomHeaders: make(map[string]string)},
-		Webhook:       types.WebhookOutputConfig{CustomHeaders: make(map[string]string)},
-		Alertmanager:  types.AlertmanagerOutputConfig{ExtraLabels: make(map[string]string), ExtraAnnotations: make(map[string]string)},
-		CloudEvents:   types.CloudEventsOutputConfig{Extensions: make(map[string]string)},
+		Customfields:    make(map[string]string),
+		Templatedfields: make(map[string]string),
+		Grafana:         types.GrafanaOutputConfig{CustomHeaders: make(map[string]string)},
+		Loki:            types.LokiOutputConfig{CustomHeaders: make(map[string]string)},
+		Elasticsearch:   types.ElasticsearchOutputConfig{CustomHeaders: make(map[string]string)},
+		Webhook:         types.WebhookOutputConfig{CustomHeaders: make(map[string]string)},
+		Alertmanager:    types.AlertmanagerOutputConfig{ExtraLabels: make(map[string]string), ExtraAnnotations: make(map[string]string)},
+		CloudEvents:     types.CloudEventsOutputConfig{Extensions: make(map[string]string)},
 	}
 
 	configFile := kingpin.Flag("config-file", "config file").Short('c').ExistingFile()
@@ -445,6 +446,7 @@ func getConfig() *types.Configuration {
 	}
 
 	v.GetStringMapString("Customfields")
+	v.GetStringMapString("Templatedfields")
 	v.GetStringMapString("Webhook.CustomHeaders")
 	v.GetStringMapString("CloudEvents.Extensions")
 	v.GetStringMapString("AlertManager.ExtraLabels")

outputs/timescaledb.go

@@ -4,12 +4,18 @@ import (
 	"context"
 	"fmt"
 	"log"
+	"strings"
 
 	"github.com/DataDog/datadog-go/statsd"
 	"github.com/falcosecurity/falcosidekick/types"
 	"github.com/jackc/pgx/v5/pgxpool"
 )
 
+type timescaledbPayload struct {
+	SQL    string `json:"sql"`
+	Values []any  `json:"values"`
+}
+
 func NewTimescaleDBClient(config *types.Configuration, stats *types.Statistics, promStats *types.PromStatistics,
 	statsdClient, dogstatsdClient *statsd.Client) (*Client, error) {
 
@@ -39,14 +45,75 @@ func NewTimescaleDBClient(config *types.Configuration, stats *types.Statistics,
 	}, nil
 }
 
+func newTimescaleDBPayload(falcopayload types.FalcoPayload, config *types.Configuration) timescaledbPayload {
+	vals := make(map[string]any, 7+len(config.Customfields)+len(config.Templatedfields))
+	vals[Time] = falcopayload.Time
+	vals[Rule] = falcopayload.Rule
+	vals[Priority] = falcopayload.Priority.String()
+	vals[Source] = falcopayload.Source
+	vals["output"] = falcopayload.Output
+
+	if len(falcopayload.Tags) != 0 {
+		vals[Tags] = strings.Join(falcopayload.Tags, ",")
+	}
+
+	if falcopayload.Hostname != "" {
+		vals[Hostname] = falcopayload.Hostname
+	}
+
+	for i, j := range falcopayload.OutputFields {
+		switch v := j.(type) {
+		case string:
+			for k := range config.Customfields {
+				if i == k {
+					vals[i] = strings.ReplaceAll(v, "\"", "")
+				}
+			}
+			for k := range config.Templatedfields {
+				if i == k {
+					vals[i] = strings.ReplaceAll(v, "\"", "")
+				}
+			}
+		default:
+			continue
+		}
+	}
+
+	i := 0
+	retVals := make([]any, len(vals))
+	var cols strings.Builder
+	var args strings.Builder
+	for k, v := range vals {
+		cols.WriteString(k)
+		fmt.Fprintf(&args, "$%d", i+1)
+		if i < (len(vals) - 1) {
+			cols.WriteString(",")
+			args.WriteString(",")
+		}
+
+		str, isString := v.(string)
+		if isString && (strings.ToLower(str) == "null") {
+			retVals[i] = nil
+		} else {
+			retVals[i] = v
+		}
+		i++
+	}
+
+	sql := fmt.Sprintf("INSERT INTO %s (%s) VALUES (%s)",
+		config.TimescaleDB.HypertableName,
+		cols.String(),
+		args.String())
+
+	return timescaledbPayload{SQL: sql, Values: retVals}
+}
+
 func (c *Client) TimescaleDBPost(falcopayload types.FalcoPayload) {
 	c.Stats.TimescaleDB.Add(Total, 1)
 
-	hypertable := c.Config.TimescaleDB.HypertableName
-	queryInsertData := fmt.Sprintf("INSERT INTO %s (time, rule, priority, source, output) VALUES ($1, $2, $3, $4, $5)", hypertable)
-
 	var ctx = context.Background()
-	_, err := c.TimescaleDBClient.Exec(ctx, queryInsertData, falcopayload.Time, falcopayload.Rule, falcopayload.Priority.String(), falcopayload.Source, falcopayload.Output)
+	tsdbPayload := newTimescaleDBPayload(falcopayload, c.Config)
+	_, err := c.TimescaleDBClient.Exec(ctx, tsdbPayload.SQL, tsdbPayload.Values...)
 	if err != nil {
 		go c.CountMetric(Outputs, 1, []string{"output:timescaledb", "status:error"})
 		c.Stats.TimescaleDB.Add(Error, 1)
@@ -58,4 +125,8 @@ func (c *Client) TimescaleDBPost(falcopayload types.FalcoPayload) {
 	go c.CountMetric(Outputs, 1, []string{"output:timescaledb", "status:ok"})
 	c.Stats.TimescaleDB.Add(OK, 1)
 	c.PromStats.Outputs.With(map[string]string{"destination": "timescaledb", "status": OK}).Inc()
+
+	if c.Config.Debug {
+		log.Printf("[DEBUG] : TimescaleDB payload : %v\n", tsdbPayload)
+	}
 }

outputs/timescaledb_test.go

@@ -0,0 +1,62 @@
+package outputs
+
+import (
+	"encoding/json"
+	"regexp"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/falcosecurity/falcosidekick/types"
+)
+
+func TestNewTimescaleDBPayload(t *testing.T) {
+	expectedTableName := "test_hypertable"
+	expectedTime, _ := time.Parse(time.RFC3339, "2001-01-01T01:10:00Z")
+	expectedValues := map[string]any{
+		"time":             expectedTime,
+		"rule":             "Test rule",
+		"priority":         "Debug",
+		"source":           "syscalls",
+		"output":           "This is a test from falcosidekick",
+		"tags":             "test,example",
+		"hostname":         "test-host",
+		"custom_field_1":   "test-custom-value-1",
+		"template_field_1": "falcosidekick",
+	}
+
+	var f types.FalcoPayload
+	require.Nil(t, json.Unmarshal([]byte(falcoTestInput), &f))
+	f.OutputFields["custom_field_1"] = "test-custom-value-1"
+	f.OutputFields["template_field_1"] = "falcosidekick"
+
+	config := &types.Configuration{
+		Customfields: map[string]string{
+			"custom_field_1": "test-custom-value-1",
+		},
+		Templatedfields: map[string]string{
+			"template_field_1": `{{ or (index . "proc.name") "null" }}`,
+		},
+		TimescaleDB: types.TimescaleDBConfig{
+			HypertableName: "test_hypertable",
+		},
+	}
+	output := newTimescaleDBPayload(f, config)
+
+	re := regexp.MustCompile(`INSERT\s+INTO\s+(test_hypertable)\s+\((.*)\)\s+VALUES\s+\((.*)\)`)
+	submatches := re.FindStringSubmatch(output.SQL)
+	tablename := submatches[1]
+	cols := strings.Split(submatches[2], ",")
+
+	require.Equal(t, expectedTableName, tablename)
+	require.Equal(t, 9, len(cols))
+	for i, v := range cols {
+		if val, exist := expectedValues[v]; exist {
+			require.Equal(t, val, output.Values[i])
+		} else {
+			require.Fail(t, "Missing expected column: %s", v)
+		}
+	}
+}